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Mitigating Forced Outages with Contingency Plans
July 18, 2022 6:24 pm Leave a Comment
Heavy industry sectors rely on large-scale electric motors and generators to power critical equipment like pumps, compressors, ball mills, rolling mills, and mine hoists. However, even with rigorous preventive maintenance programs in place, these critical assets can unexpectedly fail, having an adverse effect on customer commitments, revenue, and profitability.

Working with a trusted service provider to develop motor contingency plans for your critical assets can help ensure a rapid return to normal business operations and output. By planning ahead with proactive repair plans, you also provide your customers with peace of mind, setting your company apart from the competition. This guide highlights the advantages of contingency plans versus the consequences of lacking a contingency plan.

Financial Impact Without a Contingency Plan

The negative financial effects of unexpected motor or generator downtime can cost hundreds of thousands of dollars in lost revenue per day, not including other ancillary costs for emergency repair service. For example, if the loss of a critical motor creates a loss of $100,000 per day and the number of days it will take to repair is roughly 30 days, the cost of a forced outage could be as high as $100,000 x 30 days, resulting in as much as $3 million, plus ancillary costs and the negative impact on client deliveries.

Plant Savings with a Contingency Plan in Place

Alternatively, when you have developed a contingency plan for a critical motor or generator, downtime losses can be reduced by as much as 30%. For example, if the standard emergency repair for a critical motor takes 45 calendar days, by developing a contingency plan for that asset, you can reduce the repair time by 15 days. Based on a revenue stream loss of $100,000 per day, the savings could be up to $1.5 million with far less client impact.

Contingency Plan Development – Basic Steps

There are two components to contingency planning: plant contingency planning and repair shop contingency planning.

Plant Contingency Planning

To fulfill your plant’s responsibility for contingency planning, you must:
- Identify your plant’s critical motor and generator assets
- Examine the logistics involved for removing and reinstalling these assets to determine the most efficient way to do so
- Identify any special services or tools that you will require, such as cranes, scaffolding, rigging, or trades, and assure their availability
Repair Shop Contingency Planning

Contingency planning is more involved when it comes to the repair shop responsibility. To best cover all possible outcomes, you should:
- Develop a contingency plan for each motor. When creating a contingency plan, keep it simple by planning on no more than one to three hours for each motor. Make templates to keep your format consistent for all motors.
- Create a repair timeline. A comprehensive contingency plan will include a timeline for both standard and emergency repairs. Rather than using Microsoft Project, Excel will be sufficient for developing your timelines.
- Identify the necessary variables. As part of your plan, include acceptable transportation services and whether or not team driving is required for long distances to expedite shipping. Also, determine if there are any special requirements to account for, such as blocking, tarping, and stands.
- Gather all technical data. This should include motor manuals, outline drawings, and winding data, as available.
- Acquire a spare parts list from the plant. Your list should cover such components as bearings, seals, heaters, RTDs, brushes, brush boxes, slip rings, commutators, and equalizers.
- Compile and document key contacts. Your contingency plan should include contact information for the plant, repair shop, and your suppliers.
- Draft a contingency plan. Incorporating the above information, write up your contingency plan. Your final copy should be saved in a PDF file format and, if desired, a physical three-ring binder for your technical library.
- Plant approval and implementation. Once your draft is complete and the contingency plan is fully approved, you’ll turn theory into practice by implementing your plan.
How Renown Electric Can Help

Forced outages can negatively affect your business, mostly through expensive downtime, increased labor, and higher repair and replacement costs. Fortunately, Renown Electric Motors & Repair Inc. can assist you in avoiding such major problems by helping you develop cost-saving contingency plans and other support services.

We understand the effects of downtime on your business, and so Renown Electric provides you with a customized Total Care Support Cost plan to help you sustain successful operations at a fixed, affordable price. Our expert team will use our advanced technology to inspect your electric motors, with capabilities including laser alignment, infrared thermography, dynamic balancing, and analysis for oil, winding, vibration, and motion amplification. Contact us today to learn more about our products and services.
Elevator Motors
July 12, 2022 3:42 pm Leave a Comment
As frequently-used mechanical components, elevators in buildings must be reliable and compliant with local codes. Relationships between elevator contractors and building owners must be solid to ensure safe and consistent operation. At Renown Electric, we provide elevator contractors with the additional services necessary to restore and maintain elevator components so that they operate smoothly.

Renown Electric repairs elevator motors, gearboxes, drives, sheaves, generators, maintenance parts, and new units in-house. We also stock replacement parts for speedy, dependable service. We regularly service obsolete and exchange units. Our in-house coil winding and machining capabilities enable us to help contractors return elevator units to full 24/7 service. Learn more about the services we provide.

Sheave Regrooving and On-site Machining

Sheave regrooving and on-site machining are essential for optimal elevator operation and safety. Sheave groove audit kits from Renown Electric give you the flexibility to inspect sheaves at any moment. We also provide on-site maintenance services like sheave regrooving and shaft machining to assist you in optimally maintaining your customers’ elevator equipment.

DC Machine Modernization

Renown Electric performs detailed modernization surveys to determine the work required to restore your gearless DC unit so that it can safely integrate with newer technologies. With a special focus on the motors and control systems, we assess all of the motor’s components and make recommendations to improve their safety and performance. Modernized elevators also consume less power and lower energy costs.

We can increase the longevity of elevator commutators and carbon brushes with our undercutting and turning services. Our team uses specially designed equipment to optimize electric current transfer and commutation. These capabilities are part of our extensive preventative maintenance program.

Preventative Maintenance

The value of a preventative maintenance program can be illustrated with the following hypothetical scenario.

Let’s examine the maintenance requirements and expenses of an elevator over a 25-year period, which is the estimated lifespan of an average motor. If the motor requires emergency repairs every five years, each repair costs $1,200 in labor and $750 in parts. That means four total emergency repairs totaling about $7,800 (the motor is replaced in year 25). A preventative maintenance program on top of these repairs costs about $275 per year, which ensures the motor runs the entire 25-year lifespan without needing a complete replacement. The total cost of maintaining the elevator for 25 years comes out to around $14,675.

Without preventative maintenance, the motor will likely need to be replaced completely at least once within that 25-year period. Purchasing a new motor costs $5,000, plus about $6,400 in installation labor. In addition, emergency repairs are still required every five years. This brings the total cost of maintaining the elevator up to $19,200.

The difference in cost comes out to a sizeable 30%. Preventative maintenance not only saves you money in the long run but also leads to more reliable performance, passenger safety, energy efficiency, and increased passenger satisfaction.

Gearbox Build Repair

Renown Electric services single-stage and multi-stage gearboxes of any type, including bevel helical, helical, or worm gears. Our skilled staff uses a vast range of state-of-the-art calibrated equipment.

We offer the following services with quick turnaround times:
- Comprehensive, exhaustive testing
- On-site vibration analysis
- On-site laser alignment and balancing
- Predictive maintenance programs
- Free job-site pickup and return in Southern Ontario
Drive Repair

Motor drives convert electrical energy into mechanical energy to offer controls that regulate speed and torque, create smoother performance, and limit machine damage. A properly functioning variable frequency drive can deliver up to 55% in energy cost savings.

Maintaining this efficiency through preventative (PM) and predictive (PdM) motor drive repair services is an important aspect of Renown Electric’s Drive Services. However, this necessary maintenance is often put off until the machine undergoes catastrophic failure. If you are experiencing electric motor drive problems, don’t wait to take control of your system.

Diagnosing and Repairing Motor Drives

Renown Electric offers fast, cost-effective motor drive repair services. Our expertise includes diagnostics and repairs for a broad variety of drives and includes load testing, communication verification, and reprogramming services.

How Renown Can Help

Regular, in-depth elevator motor maintenance is crucial to keeping tenants satisfied, increasing passenger safety, lowering energy costs, and reducing system downtime. Renown Electric is your one-stop shop for elevator motors, motor parts, and guarding. We recognize the importance of getting you the right items when you need them, so we deliver fast, accurate solutions to all our customers.

Contact us for additional details on our elevator products and services.
How Does a Wind Turbine Generate Electricity?
April 25, 2022 3:36 pm Leave a Comment
Wind electricity production has seen significant growth in the last two decades. Thanks to advances in wind energy technology, the cost of generating electricity from the wind has reduced significantly. The U.S. government has also supported wind electricity production through incentives and other programs.

Wind turbines convert wind power to mechanical power and then to electricity. The wind rotates the propellers of a wind turbine, and then the propellers cause the rotor—which has a main shaft connected to a generator—to spin. Mechanical power flows into the generator, which converts the power into electricity.

How Do Wind Turbines Work?

Turbines often have two or three blades that function like helicopter rotor blades or airplane wings. When wind flows across these blades, it causes a decrease in air pressure on one side of the blade. This air pressure variation between the sides of the blades causes a lift and a drag. The lift has a stronger force than the drag, causing the rotor to spin. The rotor can have a shaft, gearbox, or a direct drive turbine connecting to the generator that produces AC electricity. Thus, the turbine system converts aerodynamic force into electricity.

Where Does the Wind Turbine-Generated Electricity Go?

Depending on the turbine’s size, the electricity generated can either be used to power a few houses and businesses or be connected to the national grid to boost its voltage. Offshore wind turbines—installed in the middle of the ocean—are large, capturing and generating much more energy than land-based turbines.

Small wind turbines are often utilized for hybrid energy systems in remote locations to bolster energy sources from batteries, diesel generators, and photovoltaics. Hybrid energy systems are growing in popularity for both off-grid and grid-connected settings for added reliability and efficiency.

The Importance of Wind Turbine Generators

The generator is a key component of the wind turbine because it converts mechanical energy into electricity. Wind power production would not be possible if the generator fails. Therefore, generators should be kept in proper working conditions at all times. The best way to ensure that is through regular maintenance and timely repairs. A thorough preventative maintenance program can prolong the lifespan of wind turbine equipment and save on cost. Proper preventative maintenance practices help wind turbine operators to monitor and address any issues before complete part failure.

Common Wind Turbine Generator Problems

Excessive vibration: This is one of the most common causes of generator failure. Excess vibration of the head and body of a turbine can lead to complete failure during operation.

Ineffective yaw systems: This problem is caused by frequent changes in wind speed and direction, which can break down the effectiveness of the yaw system. It increasingly struggles to rotate the turbine according to the direction of the wind. Sometimes, the yaw system ends up overspeeding the rotation and impairing the stability of the wind turbine.

Other generator problems involve:
- Irregular voltage
- Cooling system failures
- Wind loading
- Bearing failures
- Harsh weather conditions
- Thermal cycling
Note that the location and type of wind turbine may affect the frequency of maintenance. In some cases, this means you may need to conduct more maintenance than the turbine manufacturer’s recommendation.

Wind Turbine Generator Repair and Maintenance From Renown Electric

Wind turbines are highly effective if they are well maintained. Regular maintenance of wind turbine generators is key to reducing the cost of producing wind energy and improving the overall service life of the turbines.

At Renown Electric, we have years of experience providing wind turbine generator repair and maintenance services. We also have an extensive inventory of replacement parts to ensure we complete turbine repairs quickly. Our ISO 9001:2015 certification, ISN compliance, Electro-Mechanical Authority (EASA) membership, EXIROS compliance, and other certifications are a testament to our commitment to providing our clients with the best products and services.

Renown Electric is also an authorized warranty center for many major brands that manufacture electric motors. Contact us today to schedule wind turbine generator maintenance services or to learn about our other products and capabilities.
Renown Electric Opens a New Large Motor & Generator Repair Facility
February 1, 2022 9:00 am Leave a Comment
At Renown Electric, we’ve provided electric motor & generator repair and replacement services for nearly 40 years. Throughout our years in business, we’ve offered unmatched customer service to companies in a wide range of industries across the globe. Whether you’re a small start-up or a multinational corporation, we can and will support all of your rotating equipment needs.

The opening of our large motor and generator service centre has enabled us to expand our scope of capabilities to include the repair of large-scale electric motors and generators. The 34,000 square foot workshop is fully equipped for the repair and refurbishment of all large rotating machines. Additionally, it houses a highly skilled team of electro-mechanics, winders, engineers, and technicians, all of whom have extensive knowledge and experience in large motor and generator repair and refurbishment, and a support team of quality control, health and safety, procurement, administrative, and logistics specialists. With this equipment and team of experts, Renown Electric is well placed to deliver high-quality repair and refurbishment services for electrical rotating machines.

Our In-Shop and In-Field Capabilities

Our new service facility contains a broad selection of state-of-the-art equipment. These machines and tools enable us to offer many in-shop and in-field services to our customers, including:
- AC Motor Overhaul, Repair, and Rewind
- AC Generator Overhaul, Repair and Rewind
- DC Motor and Generator Overhaul, Repair and Rewind
- High & Medium Voltage Rewinds to 13.8kV
- Rotor Rebar
- Reverse Engineering
- Mechanical Repairs and Machine Shop Services
- Full Formed Coil and Rotor Pole manufacturing both AC & DC
- Electrical Testing
It also features a carefully designed workshop floor layout with segregated areas to ensure the effectiveness of our Foreign Material Exclusion (FME) program. This program is essential as the control and abatement of contamination and foreign particles is critical when working with motors and generators, especially those that are rated for high-voltage.

Our Equipment List

The equipment housed in our new large motor and generator service facility includes:

High Bay Workshop Equipment:
- 50-ton gantry crane
- Large GUSPRO burn-off oven with inside working dimensions of 12 feet (W) by 12 feet (L) x 12 feet (H)
- Large RAPID bake oven with inside working dimensions of 12 feet (W) by 20 feet (L) by 12 feet (H) and chart recorder
- Wash booth measuring 16 feet x 15 feet with grease interceptor pit
- Spray painting booth measuring 12 feet x 12 feet
- Stripping booth measuring 8 feet (W) x 10 feet (L) x 8 feet (H)
- Varnish immersion tank measuring 8 feet x 6 feet by 8 feet containing Dolphon CC1105 solventless polyester resin
Machine Shop Equipment:
- Accu-turn 1120 CNC lathe with 70-inch swing
- Clover 20/29 lathe with 18-inch swing
- STANKO model 1516 vertical lathe with 55-inch table, 4 jaw chuck, and 62-inch swing
- Milling machine with 16 in. x 70 in. bed and digital readout
Main Workshop Equipment:
- 45-ton bridge crane with 25-ton and 7-ton auxiliary hooks
- Peerless heavy-duty armature banding lathe rated for 10,000 lbs. with a 50-inch swing
- Rotor pole assembly lathe rated for 15 tons with a 130-inch swing
- 100-ton hydraulic press
- Schenck dynamic balancing stand with CAB690/H60B interface rated for 44,000 lbs.
- Hipotronics Model MTA 13.8-2000 AC motor test stand rated for 600V at 1,200A to 13.8kV at 84A
- Hipotronics MTD.5 — 250 DC motor test stand rated for 0–500VDC at 500A
- Skid-mounted turbo oil lubrication pumps for test running motors with pressure-fed bearings
Winding and Formed Coil Manufacturing Equipment:
- Bartech GTR 3500 formed coil taping robot
- 2 James Model SG 600-C formed coil spreaders
- Steelworks hydraulic coil hot press (double press)
- Bartech horizontal hydraulic press for coil strand consolidation
- P + R coil former/looper
- TS Manufacturing large coil looper with automatic turn taping head
- Peerless automatic wire strand cutter and insulation stripper
Welding and Brazing Equipment:
- 2 Minac 12 Twin, high-frequency induction brazing machines
- 2 Dynaflux resistance brazing units
- Lincoln 275 precision TIG welder
- Miller Dynasty 700 welder
Electrical Test Equipment:
- Phenix AC Hi-Pot test set, 0-3/6kV 20/10A 60kV
- Electrom winding analyzer (surge tester), TIG II Mini with 40kV power pack
- 40kV PJ surge tester Model 9040
- Digital low resistance ohmmeter DLRO 10X
- Hipotronics HD100 40 KVDC Hi-Pot Test Set
Choose Renown Electric for Your Large Motor & Generator Repair Needs

For all your electric motor and generator repair and refurbishment needs, turn to the experts at Renown Electric! Our new facility contains everything we need to handle large-scale motors, generators, and other rotating machinery. Contact us today to learn more about our service and support capabilities and how they can benefit your organization.
How the Aggregate Industry Utilizes Electric Generators & Motors
August 24, 2021 1:34 pm Leave a Comment

The aggregate industry in Canada and The United States is responsible for mining, grinding, and selling billions of metric tons of sand, crushed rock, and gravel every year. Aggregate is commonly used in the construction industry, where it is a primary component for applications such as asphalt, concrete, and road building materials. Aggregate is all around us, from our homes and workplaces to the roads and sidewalks. As an essential driver of the economy and society, aggregate industry operations must be maintained through the use of electric motors and generators.

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How The Aggregate Industry Uses Electric Motors and Generators

Electric motors and generators are critical throughout the various applications of the aggregate industry. Electric motors are essential for converting electrical power to the mechanical power used to accomplish many of the daily functions of mining, crushing, and transporting aggregate. These motors also have to be engineered to endure harsh environments and tough handling, while also providing reliable performance to get the job done each day, regardless of the season.

Electric motors are commonly employed to power conveyors, crushers, hoists, kilns, agitators, pumps, and ventilators. These machines are essential to the daily operation of aggregate operations.
- Crushers are machines that grind bigger rocks into smaller, uniform rocks and stones used in various applications.
- Conveyors then take the crushed material from the crusher and transport it to its next station on the way to becoming building materials, roads, etc.
- Hoists are used to lift and move heavy loads from one place to another when required.
All of these machines require electric motors and generators to make sure the process continues to move and progress, operating with optimal efficiency and performance.

Benefits of Electric Motors for the Aggregate Industry

One of the most important benefits of using electric motors in the aggregate industry is that it helps create opportunities to reduce the use of fossil fuels while bringing better control and improved efficiency to a host of operations.

Many aggregate companies have opted out of using big diesel engines and switched over to electric wheel motors for their hauling processes. These are now run via battery packs, which is a cleaner, more efficient solution. Some companies are also replacing older diesel engines with new, more effective electric motors to power the hydraulic systems they use for scooping and traction.

Aggregate industry leaders are making the switch to electric motors because they are reducing operating costs and downtime while improving efficiency. Furthermore, electric motors are more resilient and perform more reliably in cold weather as opposed to diesel engines that struggle under a certain temperature threshold. This certainly improves productivity over the winter months to keep up with demand and reduce costs and downtime.

Electric Generators & Motors from Renown Electric

For almost four decades, Renown Electric has provided industry-standard electric motors and generators for customers in various industries, including the aggregate industry. We are ISO 9001:2015 certified and carry a wide range of other certifications to ensure compliant and top-quality products. We are available to our customers around the clock, 365 days a year for delivery, pick-up, and motor repair. To learn more about or electric generator and motor solutions for the aggregate industry, contact us today.

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How the Oil & Gas Drilling Industry Uses Electric Generators & Motors
August 2, 2021 8:09 pm Leave a Comment

The oil and gas industry consists of onshore and offshore drilling operations, which rely on drilling rig equipment to extract oil and natural gas from reservoirs. Drill rig equipment often use electric motors as their power source, and these motors must be able to withstand vibration, extreme temperatures, consistent impacts, corrosive environments, and other harsh conditions typical in oil and gas settings.

Since electric motors play a crucial role in the oil and gas drilling industry, it’s important to have a proper preventative maintenance plan to ensure optimal performance, safety, and efficiency of the equipment.

How Electric Generators and Motors are Used in the Oil & Gas Drilling Industry

Electric motors are used to provide reliable and consistent power for drilling rig systems and equipment. The power that these motors generate is used to support the extraction, processing, storage, and transportation of products such as crude oil, petroleum, and natural gas.

Specifically, electric motors power the drilling process by providing an energy source for the rig’s draw works and other machinery. Induction motors and synchronous generators provide power for many applications throughout onshore and offshore drilling operations. Electric motors also drive fluid-control equipment such as pumps, fans, and compressors used by the oil and gas industry.

Finding cost-effective and reliable power for offshore drilling operations once presented significant challenges. Electric generators eliminate these challenges by providing a dependable power source for extraction equipment and other oil and gas drilling operations.

Preventative Maintenance for Electric Motors

Due to the harsh conditions of oil and gas drilling, the equipment used throughout this industry is exposed to many stressors which make adopting a regular maintenance program essential. Having a regular monitoring and scheduling protocol for the electric motors used in drilling operations will extend the lifespan of the equipment and ensure its reliable functioning. Additionally, preventative maintenance plans help identify and address any potential issues before they become serious ones, which can prevent unexpected operation downtime and high repair costs.

How Renown Electric Serves the Oil & Gas Drilling Industry

Renown Electric offers customized electric motor & generator repair and maintenance services, in addition to a diverse selection of in-stock electric motors that meet the requirements of oil and gas operations. We understand the vital role electric generators and motors play in the success of the oil and gas industry and deliver products and services designed to ensure longevity and optimal results.

Your Source for Oil & Gas Industry Solutions

Renown Electric has over three decades of experience delivering electric motor sourcing, repair, and maintenance solutions. We are ISO 9001:2015 certified and provide repairs that meet or exceed OEM specifications. Renown Electric operates from a 25,000 square foot state-of-the-art main repair facility, a 34,000 square foot large motor and generator service center with 50 ton cranes throughout, and a 12,000 square foot warehouse, totallying in over 70,000 feet of working space, allowing us to handle maintenance and repair projects of any size. To learn more about our services or develop a maintenance plan for your electric motors, contact us today.
6 Reasons Why Wind Power Turbine Maintenance is so Crucial
May 5, 2021 8:25 pm Leave a Comment

Wind power has proven itself a valuable player in the renewable energy market and currently stands as the fastest-growing renewable energy source in North America. Wind turbine generators drive the wind energy industry and have long-term investment potential in a fast-growing market.

Wind turbine generators convert wind energy into electrical energy at a minimal cost without consuming natural resources. While turbines are considered relatively low maintenance, a preventative maintenance program is still essential to keep them running at maximum efficiency. As wind turbine generators age and wear, their reliability and performance can lessen significantly without proper care.

Benefits of Wind Power

Wind turbine generator blades harvest wind power by spinning the turbine to convert it into renewable electrical energy. Wind power offers a variety of benefits, including:
- Cost-effectiveness. Although the initial investment in wind turbines is higher than other renewable energy sources, wind turbines create energy from free resources without consuming fuel. Once built, they also have low operating costs. Wind turbine farms can easily recover the initial investment and any associated maintenance costs over the life of the turbine.
- Clean and renewable energy. Unlike oil, gas, and coal, wind energy generation does not produce pollutants that contribute to climate change and result in economic damage, health concerns, acid rain, and smog.
- Domestically sourced. Wind farms have changed the national energy landscape by harvesting a plentiful and renewable resource throughout much of the US and Canada. In the last decade, the US wind power capacity has grown by approximately 15% each year.
- Sustainability. Wind is actually a form of solar energy because wind itself results from the sun heating the atmosphere as the planet rotates. Wind power will provide sustainable energy as long as the sun and Earth exist.
- Efficient use of land space. Though wind farms use large plots of land, individual wind turbines have a relatively small footprint. Resourceful landowners can install one or more wind turbines on farms and ranches alongside crops and pastures to provide low-cost energy or an additional revenue stream without committing large amounts of space.
- Job opportunities. Wind power drives a growing job market for wind turbine generator operation, service, and repair positions. It Is one of the fastest-growing sectors in the United States, currently employing more than 100,000 workers.
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Importance of Wind Turbine Generator Maintenance

Wind turbine maintenance ensures uninterrupted operation and optimal performance. Much like any power-generating machinery, wind turbines constitute a large investment. Wind farms invest in turbine generators with the expectation of long-term returns from the sale of electrical energy to companies and distributors.The failure of a wind turbine can result in downtime and costly repairs, potentially delivering a devastating blow to the wind farm’s profitability. Regular turbine maintenance minimizes the risk of downtime by identifying and correcting problems early to prevent equipment failures. It also helps ensure maximum equipment lifespan and reliability.

Partner With Renown Electric for Wind Turbine Generator Maintenance

Renown Electric delivers repair and maintenance services to ensure your wind turbine generators operate efficiently and reliably. We carry a broad range of high-quality replacement parts for wind turbine generators, including pitch control motors, heat exchangers, slip rings, and much more. Our preventative and predictive maintenance services keep your wind turbine generators running at ideal performance levels. Renown Electric’s technicians are experienced and certified to deliver the highest quality repairs and meet your needs.

Renown Electric has been in the repair service industry since 1984. From our ISO 9001:2015-certified, 60,000-square-foot facility in Ontario, we repair and maintain wind turbine generators and equipment using the leading technology and parts. We meet or exceed OEM repair and maintenance standards and we are CSA-qualified to handle hazardous repairs.

Contact us to speak with a representative about our repair and maintenance capabilities today.
Common Causes of Electric Motor Failure
January 4, 2021 9:35 pm Leave a Comment

Industrial electric motor systems have become more complicated, so when malfunctions occur, it is not always easy to identify the cause. Motor failure may be caused by mechanical or electrical problems, especially if the motor is improperly sized, installed, or maintained. Understanding the most common causes of motor failure can help you prioritize preventative maintenance and prevent costly downtime.

Transient Voltage

Transient voltage refers to short power surges from either internal sources, such as static discharge, or external sources, such as lightning or shared transformers. These surges vary in amplitude and frequency, and because of their variability and uncommonness, it can be difficult to identify the source of the problem. Transients force motors to overheat and interfere with timing. Over time, exposure to transients can degrade motor winding, leading to complete motor failure.

If it is impossible to remove the source of the transient voltage, such as when it is coming from external sources, transient surge suppressors may help level the voltage entering the motor to prevent damage.

Reflections on Drive Output PWM Signals

Variable-frequency drives use a technique known as pulse width modulation (PWM) to synthesize the motor’s output. When installed or maintained improperly, these devices produce reflections, meaning that some of the signal travels back to the origin. These reflections cause impedance mismatches and produce strain on the motor winding insulation, resulting in motor failure.

Overload and Overheating

One of the simplest causes of motor failure is overload, which occurs when you exceed a motor’s capacity, resulting in overheating and excess current draw. Motor overload causes both mechanical and electrical damage, inducing premature wear and degradation of the motor winding insulation. These effects can be prevented by properly sizing the motor to the driven load.

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Misalignment

Misalignment is another common cause of motor failure that is rooted in improper setup. Misalignment occurs when the drive shaft does not line up with the load, causing harmful vibrations that wear down the motor. Different types of misalignment include:
- Angular
- Parallel
- Compound
- Rotating looseness
- Non-rotating looseness
Any of these misalignments can cause motor failure as they wear down system components, but they can all be prevented by ensuring that the drive shaft is always properly aligned with the load before operation.

Imbalance

Imbalance is similar to misalignment in that it involves a simple mechanical inefficiency that compounds into serious damage over time. Imbalances occur when mass is unevenly distributed around an axis of rotation, which can happen in a number of circumstances, including:
- Improper installation
- Dirt or rust build-up
- Faulty components
- Missing or missized balance weights
Preventative maintenance is key to spotting and fixing imbalances before they ruin a motor.

Bearing Wear

Bearing wear is another isolated mechanical failure that cascades into more serious damage. Failed bearings are less efficient and emit more heat than functional bearings, forcing additional strain on functional components, which are then at higher risk of failure themselves. Bearings can fail for any number of reasons, including:
- Overloading
- Improper lubrication
- Shaft misalignment
- Improper installation
Bearings can also fail due to normal wear and tear. Your regular maintenance routine should include inspections to verify bearing integrity and replace those that show signs of deterioration. Otherwise, a single failed bearing can quickly become a completely failing motor.

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Renown Electric: Maintenance & Repair for Industrial Motors

Motor failure can occur despite your best intentions due to either errors or normal wear and tear. Regardless of the cause, downtime is expensive, so it’s critical to have a repair shop that you can trust. Renown Electric offers comprehensive shop services to diagnose and repair motor problems of all kinds, drawing on computerized testing and leading repair equipment to quickly return motors to OEM standards. Our professional staff is on hand 24/7 to help troubleshoot so you can get up and running as soon as possible.

As an ISO 9001:2015-certified company, we take pride in the quality of our repairs, and clients have trusted our services for over 30 years. In addition to repair services, we also work with clients to develop personalized preventative maintenance protocols tailored to their unique needs. Our shop offers extensive on-site testing capabilities for advanced diagnostics, and we draw on custom system analyses to inform our preventative and predictive maintenance recommendations.

With our affordable maintenance services, you can protect your facility from the costly downtime and replacements associated with motor breakdown. To learn how Renown Electric can help you prevent motor failure, repair damaged systems, and maximize your efficiency and bottom-line, please contact us today.
The Importance of Generator Repair and Maintenance for the Hydroelectric Sector
December 8, 2020 3:49 pm Leave a Comment

Hydroelectric power, the single greatest source of renewable energy around the world, is derived from moving water through the use of dams and hydroelectric power plants. Since no fuel is burned to create hydroelectric energy, it does not produce greenhouse gas emissions like more traditional fossil fuel power plants. The cost of running a hydroelectric plant is much lower, as water is provided by nature in the form of precipitation, so no additional fuel is needed.

How Hydroelectric Energy Works

Although hydroelectric power system configurations may differ based on the location and water source, the operating principle is the same. A hydroelectric power plant is built on a river, stream, or other moving body of water.

In order to create enough energy to generate electricity, the water must move with adequate speed and volume to turn the turbine blades within the dam. Openings in the dam barrier, also known as penstocks or floodgates, allow operators to control the water flow past the free-spinning turbine blades, which are in turn attached to a rotor. Coils on the rotor create an electromagnetic field when they move past stationary coils in the system’s generator, converting the rotary motion into electricity.

Repairs for Hydroelectric Generators

Hydroelectric generators transform mechanical energy from the spinning turbines into electrical energy using electromagnetic coils. The harsh operating environment and sheer amount of energy flowing through the hydroelectric system places enormous stress on the components within the generator. Coil winding failures and mechanicals failures are the two most common issues faced by operators of hydroelectric generators.

Coil Winding Failure

When one of the stationary or rotary windings coils in a hydroelectric generator fails due to damage or the effects of thermal aging, theycoil must be rewound. The rewinding process involves taking detailed as-found data and measurements of the existing windings to enable new coils to be reverse engineered. The original windings are then stripped from the generator and further measurements of these coils are taken to ensure that the correct geometry is maintained for the new coils.

Rewinding a hydroelectric generator also provides an ideal opportunity to enhance the performance of the generator by utilizing conductors having an increased cross-sectional area over the original coils. Using larger conductors will reduce I2R losses in the winding and thereby improve the overall efficiency of the generator.

Mechanical Failure

Mechanical failure of a hydroelectric generator can be caused by a number of underlying issues. If any part of the system is misaligned or unbalanced, the hydroelectric equipment may experience high levels of vibration that can damage the overall system. A vibration analysis conducted while the generator is operating allows technicians to detect the location and nature of balance or alignment issues to facilitate correction at the source. Imbalance and misalignments can be caused by anything from a loose fastener or bearing to broken welds and rotors.

Other common repairs and maintenance for hydroelectric generators include the repair and replacement of bearings, slip rings, brush rigging, rotors, and flanges, as well as cleaning of stators and rotors. The size and weight of a hydroelectric generator can make repairs and maintenance difficult, but seasoned technicians are capable of conducting many repairs on location.

The Importance of Electric Motor and Generator Repairs

Electric motors and generators require regular repairs and maintenance to ensure safe and reliable operation. With critical power generation applications, it is essential that downtime be minimized as much as possible to ensure that the power supply is not interrupted. The best way to save time and money in hydroelectric operations is to conduct repairs as soon as a problem is detected. Left untreated, electrical and mechanical issues will only grow in severity, resulting in more expensive repairs, longer downtime, and greater safety risks.

To ensure that every aspect of the system stays in optimal operating condition, it is especially important to conduct regularly scheduled maintenance. A maintenance plan will provide you with a reliable overview of your system’s components, current operating condition, and expected service life. This allows you to plan for repairs and replacements, thereby further reducing the potential for excessive downtime and expensive last-minute repairs.

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Electric Motor and Generator Repairs by Renown Electric

At Renown Electric, we are pleased to offer a variety of services for our customers in the hydroelectric industry and beyond. Our specialties include industrial electric motor repair, generator rebuilding, rewinding, on-site electric motor repair, and contract maintenance services. With more than 30 years of experience with industrial electric motors, Renown has the knowledge and expertise necessary to ensure that your hydroelectric system operates with the highest degree of safety and efficiency.

To learn more about our electric motor and generator solutions, contact our experts today.
The Integral Role of Electric Motor Maintenance for The Transportation Sector
October 12, 2020 3:00 pm Leave a Comment
While the transportation industry heavily relies on combustion motors, there has been a recent shift in focus to electric-powered vehicles. From cars and trucks to trains and locomotives to ships and ferries and not to forget mining equipment and buses, nearly every mode of travel can utilize electric motors for power. By converting electrical energy (i.e., electricity) into mechanical energy (i.e., motion), they help vehicles bring people from one place to another with greater efficiency than combustion motors.

Given the essential role electric motors play in the transportation sector, it important for industry professionals to invest in proper maintenance to ensure the equipment continues to operate as intended. The following blog post outlines the applications of electric motors in the transportation sector and the importance of investing in maintenance work.

Applications of Electric Motors in the Transportation Sector

As environmental consciousness increases, more and more commuters are turning to public transportation. This trend, coupled with heightened emissions guidelines, challenges industry professionals to find ways to decrease emissions without significantly increasing operating costs. One potential solution is using electric motors in place of combustion motors, which leads to enhanced energy efficiency and reduced environmental impact.

The two main types of electric motors used in the transportation sector are AC motors and DC motors.
- AC motors are powered by alternating current (AC). They are available in four classifications: linear, induction, permanent magnet and synchronous. Induction motors are further classified into single-phase and three-phase motors, while synchronous motors are further classified into hysteresis (typically very small motors) and reluctance motors.
- DC motors are powered by direct current (DC). They are available in three classifications: self-excited, separately excited, and permanent magnet. Self-excited motors are further classified into shunt, series, and compound motors.
They find use in a wide range of transportation vehicles include:
- Public transportation vehicles, such as buses, cable cars, ferries/water taxis, light rails, monorails/tramways, streetcars/trolleys, and subways
- Trains and locomotives, including cargo and commuter trains
- Ships and other marine vehicles, including long- and short-haul cargo, cruise ships, and military ships
- Mining vehicles, including loaders, muckers, trams, scoops, haulers and utility vehicles.
The choice of motor for all of these vehicles depends on the needs of the application. For example, trains use DC motors to ensure railway traction and AC motors for long-distance travel, while ships used both AC and DC motors for their propulsion systems.

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Importance of Electric Motor Maintenance in the Transportation Sector

Similar to the motors used in other industries, the electric motors used in the transportation sector must receive proper maintenance to ensure they continue to operate effectively and efficiently. Industry professionals should establish a maintenance schedule tailored to the motor and its application. Otherwise, they risk lower efficiency, shorter service life, and other motor problems, all of which can lead to increased motor costs. In the case of motor failure, financial burdens are even greater as failed motors can cause significant service delays and, consequently, significant loss of revenue.

There are three main methods of maintenance: reactive maintenance, preventative maintenance, and predictive maintenance. Reactive maintenance programs involve resolving problems once they occur, while preventative and predictive maintenance programs work to prevent or reduce the effect of problems on the overall system. Maintenance programs that consider all three methods, especially the latter two, are important to ensuring the electric motor needs of the transportation sector continue to be met.

Electric Motor Maintenance Services From Renown Electric

At Renown Electric, we fully understand how electric maintenance services support the success of the transportation sector and beyond. We’ve provided motor maintenance and repair services for over 30 years. This experience, combined with our state-of-the-art facilities and highly skilled team members, allows us to offer our customers effective and affordable predictive and preventative maintenance and support services for nearly any electric motor management need.

Our preventative and predictive maintenance capabilities include:
- Dynamic balancing
- Infrared thermography
- Laser alignment
- Oil analysis
- Vibration analysis
- Winding analysis
- Motion Amplification analysis
We also provide a broad selection of repair services, including:
- Generator rebuilding and rewinding
- Gearbox rebuilding and rewinding
- Sheave regrooving and manufacturing
- Machine shop services
- Servo motor repair
- Pump repair
- Motor drive repair
Contact Us Today to learn more about our electric motor maintenance and repair services.

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Why Electric Motor Repair is So Important for the Mining Industry
September 25, 2020 1:33 pm Leave a Comment
In the mining and mineral processing industry and almost every other industrial operation, electric motors are at the heart of the operation and present in almost every aspect of industrial works. Electric motors drive large equipment like crushers, mills, and driving hoists, and even small reagent dosing pumps. They are an essential part of mining and mineral processing, including driving equipment like generators and pumps.

Electric Motors in the Mining Industry

Under the harsh conditions of mining hard and soft rock, equipment must be resilient to meet the demands of production safely. Greater production is always a necessity of mining operations; as ore deposits decrease, demand for mined goods only increases. Mines continuously expand to access high-quality ore when only inferior ore remains in abundance. Mining and mineral processing industries must follow trends in electric motor technology to seek the most resilient and efficient equipment.

To make mining more safe and productive, current trends are bolstering the popularity of AC motors, where in the past, the mining industry has long relied on DC motors. Underground coal mining is leading the industry in adopting AC motor technology for their many advantages. AC motors have lower noise levels, improved safety, optimized performance, and increased efficiency. Fixed speed drive systems are also being replaced with variable speed drives that offer greater control. For surface operations, the efficient induction motor is losing market share to the more productive synchronous motors.

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Electric Motor Repair Is Crucial to Keeping the Mining Industry Going

A halt in mining production can cost revenue, and when an electric motor failure results in significant downtime, that loss in revenue can span several weeks. The impact of losing a larger piece of machinery can devastate production. According to Newcrest Mining, when the motor driving their SAG mill had loose windings, their Cadia operations experienced several weeks of interruption for repair and testing. Electric motor repair for mining, such as preventative maintenance, load testing, and windings inspection provides valuable information about the equipment’s health. It can also increase the reliability and longevity of electric motor driven mining equipment.

Underground coal mining equipment manufacturers have been implementing conversions from DC to AC systems with variable frequency drives (VFDs) that allow operators to control speed and torque. AC motors can also reduce maintenance costs and require less installation time and downtime. When placed under similar circumstances, AC motors require less maintenance than their DC counterparts. This is especially true for high-maintenance parts inside DC motors like commutators and brushes.

As the mining industry transitions to AC motors with VFDs for analog speed control, the need for speed regulating techniques decreases. Hydraulic speed control, starters, mechanical gears, cascade drives, fan damper controls, and fan inlet vane controls are no longer needed with AC motors. The performance of a motor with a VFD often depends on the cooling system, which can increase the longevity of the system and remove heat from the inverter, converter, power semiconductor devices, and auxiliary components. An optimized VFD has the smallest equipment footprint while delivering rated power, which is important both for hazardous and/or tight working conditions

High-voltage drives are present in mining operations to deliver efficiency advantages to mining equipment. Soft starting large mill motors with high-voltage drives reduce stress on the large motor and help the power delivery system by eliminating low current inrushes and voltage dips. The drives also deliver necessary high-power, torque control, and speed control to the motors running large shovels and draglines.

Depend on Renown Electric for Motor Repair Services

At Renown Electric, we have served various industries with motor repair services for over 30 years. We offer the following in-house electric motor repair and shop services:
- Motor rebuilding & rewinding
- Generator rebuild & rewinding
- Gearbox rebuild & rewinding
- Sheave regrooving & manufacturing
- Servo motor repair
- Pump repair
- Motor drive repair
- Machine shop services
With 24/7 services from Renown Electric, you can extend the life and performance of your electric motors. We help mining operations prevent losses in revenue from downtime with dependable maintenance and repairs. Contact us to request a quotation or schedule service today.

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How VFD Maintenance Can Save Your Bottom Line
June 24, 2020 9:23 pm Leave a Comment

Variable frequency drives (VFDs) are devices that regulate the operation of a motor by varying the frequency and voltage levels of the electrical input. They are found in countless electromechanical systems, ranging from home appliances to industrial equipment.

Similar to other electrical and electronic components, VFDs require proper and regular maintenance to ensure they offer consistent and reliable performance. The following article discusses some of the key considerations and benefits regarding preventative maintenance for variable frequency drives.

An Overview of Preventative Maintenance for VFDs

When using variable frequency drives, it is important to keep in mind the following tips:
1. Keep them clean
2. Keep them dry
3. Keep connections tight
Keeping VFDs clean and dry and their connections secure can result in better system performance and fewer unanticipated repair and replacement needs. However, even if all of these requirements are fully met, component and complete system failure can occur as a result of many other reasons (e.g., component aging or adverse operating conditions such as excessive temperatures or loads). As such, preventative maintenance is still essential to ensuring a motorized system remains in working order throughout the duration of its expected service life.

Preventative maintenance operations should occur periodically—e.g., for low-voltage VFDs, maintenance should occur at least once a year. Some of the activities that appear on typical checklists include:
- Visually inspecting the device
- Removing dust and debris using dry compressed air
- Checking connections for proper tightness
- Setting up a replacement schedule for consumable parts
Benefits of Performing Preventative Maintenance on VFDs

By performing regular preventative maintenance on VFDs, industry professionals experience a number of benefits, such as:

Longer Service Lives in VFDs

Regularly scheduled preventative maintenance programs help industry professionals identify potential operational issues before they cause component or system failure. As a result, they help enhance the reliability and extend the life of essential equipment, including VFDs.

Better Performance from VFDs

Preventative maintenance ensures VFDs operate as intended for longer periods of time. This greater reliability also translates to better control and operational capacities, which allows the devices to accommodate a wider range of applicational requirements without risk of failure.

Bigger Cost Savings Over Time

Investing in regular preventative maintenance operations saves money in several ways. First, it reduces the need for unplanned repair and replacement costs. Second, it lowers the chance of the device requiring complete replacement. Third, it minimizes the amount of time a piece of equipment is out of commission and, consequently, the amount of money lost during downtime. Fourth, some state and local agencies offer incentives for regular VFD usage and maintenance.

Preventative Maintenance Support from Renown Electric

VFD performance can be mapped using a good quality oscilloscope and compared over time to look for variations in the performance of the drive, input power and output signal. These signals when compared to the optimized set up can indicate early signs of failure such as weakening capacitors, transformer issues, load and line reactor issues, or early warning of motor insulation issues. Variable frequency drives play a critical role in many motorized devices, equipment, and systems. For this reason, it is essential to maintain them properly and regularly to ensure they remain in working order for the entirety of their projected service lives or longer. If you need assistance keeping your VFDs in excellent operational condition, Renown Electric is here to help.

At Renown Electric, we specialize in the repair and servicing of electric motors. Armed with over three decades of experience in motor repairs and maintenance, we have the knowledge and skills necessary to keep your motorized equipment up and running. Our Total Care Support Cost plan allows you to rely on our experts for all of your predictive and preventative maintenance and support needs at a reasonable fixed cost.

Contact Us today for additional information about our maintenance services and how they can benefit your facility.
AC vs. DC Motors: What’s the Difference?
June 1, 2020 8:00 pm Leave a Comment

Electrical motors are machines designed to convert electrical energy into mechanical energy. While they are available in numerous variations, they can be categorized into two main classifications: AC motors and DC motors.
Both AC motors and DC motors have the same function; that is, to convert electrical energy to mechanical energy. However, when choosing a motor for an application, it is important to know the difference between AC and DC motors as each has distinct construction, powering, and controlling requirements. The following article discusses the differences between the two motor types, including key design and operating characteristics, advantages, and applications.

An Overview of AC Motors

As suggested by the name, AC motors rely on alternating current (AC) to generate mechanical energy. The standard design consists of a stator with winding imbedded around the circumference and a freely rotating metal part (i.e., the rotor) at the center.

When current is applied to the stator windings in an AC motor, a rotating magnetic field is generated. This magnetic field induces an electrical current within the electrically conductive rotor and, consequently, forms a second rotating magnetic field. The interaction between the first magnetic field and second magnetic field causes the rotor and, as the magnetic field alternates between coil pairs, the motor to turn.

Two of the critical factors to keep in mind when choosing an AC motor for an application are:
- Running speed (in revolutions per minute): the maximum speed a motor can achieve calculated by the following formula: (120 x AC power frequency in Hz) ÷ poles of the motor
- Starting torque: the amount of torque a motor generates when starting at zero speed
An Overview of DC Motors

DC motors rely on direct current (DC) with constant voltage to generate mechanical energy. DC motors consist of a rotating armature winding (i.e., the rotor) and a field stator with windings that form a set of stationary electromagnets. The other key component of a DC motor is the commutator which is attached to the armature.

As current flows through a DC motor, a magnetic field is generated within the field stator and around the armature winding. The interaction between these two magnetic fields produces an electromagnetic force which causes the armature to rotate. The commutator changes the direction of current flow into the armature and thereby allowing it to continue spinning as long as current flows through the system.

DC motors can be used to produce different levels of speed and torque. Adjusting the voltage levels applied to the armature or the static field current changes the output speed.

Advantages of AC Motors vs. DC Motors

Both AC motors and DC motors demonstrate unique advantages that make them suitable for different applications. Below we outline the benefits offered by both types of motors.

Advantages of AC motors include:
- Lower startup power demands
- Better control over starting current levels and acceleration
- Broader customizability for different configuration requirements and changing speed and torque requirements
- Greater durability and longevity
Advantages of DC motors include:
- Simpler installation and maintenance requirements
- Higher startup power and torque
- Faster response times for start/stop and acceleration
- Wider variety for different voltage requirements
Applications of AC Motors vs. DC Motors

As indicated above, AC motors and DC motors are suited for different applications. In the industrial sector, the durability, flexibility, and efficiency of AC motors make them ideal for use in applications for a wide range of devices, including appliances, compressors, computers, conveyors, fans and other HVAC equipment, pumps, and transportation equipment. The faster response times and more stable torque and speed levels offered by DC motors make them well-suited for use in fabrication and production equipment, elevators, vacuums, and material handling equipment.

Contact the Electric Motor Experts at Renown Electric Today

Both AC motors and DC motors play a critical role in power generation operations across a wide range of industrial, commercial, and residential applications. As both motor types offer advantages and disadvantages, it is important to understand the difference between them to ensure you pick the right one for your facility. If you need assistance choosing an AC motor or a DC motor suitable for your needs, turn to the experts at Renown Electric.

At Renown Electric, we specialize in the repair and service of electric motors. Equipped with nearly 40 years of experience working with motors, we have the knowledge and skills to repair, remanufacture, or replace motors for nearly any application.

Contact Us today to find out more about which motor is right for your facility.
A New Partnership Between Renown Electric & RDI Technologies
April 21, 2020 6:58 pm Leave a Comment
At Renown Electric, our dedication to providing our customers with the most innovative solutions for their manufacturing operations has motivated us to partner with RDI Technologies. As a certified service provider for RDI, we can provide optimized, unparalleled services using Iris M—a revolutionary device used in over 41 countries and across more than 22 industries—for monitoring motion amplification. Equipped with the Iris M, we have enhanced our capacity to offer safe, efficient, and proactive problem-solving solutions for detecting and resolving plant machinery problems.

Motion Amplification®From RDI Technologies

Reducing downtime—and the related loss of potential profits—necessitates observing, identifying, and correcting manufacturing equipment issues before they cause significant damage. One possible solution for this challenge is RDI Technologies’ patented Motion Amplification® technology.

Motion Amplification is a proprietary video processing algorithm, which makes it possible to measure the slightest deflection, displacement, movement, and vibration even before they register to the naked eye. Combining it with a video camera, allows users to detect vibrations or movements with a high level of accuracy to measure and quantify structural assets. The amplification of minuscule movements makes it possible to understand the interrelationships of the various components involved in creating these motions.

Iris M™ From RDI Technologies

Monitoring the motion of machinery is easier and safer when measurement does not require contact. RDI’s Iris M™ provides users with a non-contact means of checking machinery and equipment for potential issues before they become widespread, helping reduce costs due to machine repair and replacement operations.

The key product features of the Iris M device include:
- Visualization: allows users to see potential problems by converting subtle displacement and movement to a level visible to the naked eye using Motion Amplification®
- Communication: uses technical and non-technical resources and improves understanding of the interrelationships between the components creating movement
- Quantification and measurement: accuracy is equal to or exceeds that of a contacting displacement sensor
- Troubleshooting: identifies the source of a problem to facilitate the implementation of solutions
Contact the Experts at Renown Electric Today

At Renown Electric, we specialize in the repair and replacement of electric motors, and as a certified service provider for RDI, we utilize their products—including Iris M— alongside our engineering expertise to provide customers with high-quality solutions that facilitate the monitoring and troubleshooting of machinery and manufacturing equipment. These revolutionary products allow for quick and easy identification, analysis, and resolution of system issues for our experts, saving industry professionals both time and money.

Monitoring and troubleshooting plant machinery before it causes significant downtime and repair costs is a major challenge for industry professionals across all sectors. Motion amplification allows subtle changes in the movements of mechanized parts to be seen, allowing for early identification of root-cause issues and the application of adequate solutions.

By using RDI’s Iris M device, Renown Electric has an enhanced capacity to help monitor and troubleshoot customer’s machinery and equipment. For more information on our product and service offerings and how they can benefit your organization, contact us today.
Everything You Need to Know About VFD Maintenance
April 3, 2020 9:10 pm Leave a Comment

A Variable Frequency Drive (VFD) is a type of motor controller which drives an electric motor by varying the frequency and voltage supplied to the motor itself. Common terms used for a VFD are adjustable speed drive, variable speed drive, AC drive, adjustable frequency drive, inverter, and microdrive.

Variable Frequency Drives (VFDs) are motor controllers that allow one-way current through diodes to control the frequency and voltage of electricity reaching a device’s electric motor. VFDs must be regularly maintained and share many of the same maintenance requirements as other electronic components and power supplies. They need cool and dry environments with minimal dust and disruption, and the connections must remain stay tight for consistent performance.

VFD Maintenance: Key Aspects

The three key tenets of maintaining variable frequency drives—keeping them clean, dry, and with tight connections—are relatively simple. However, owners and facility managers need to implement regular preventative maintenance and inspection processes to make sure each requirement is met.

Keeping VFDs Clean

VFDs fall under multiple National Electrical Manufacturers Association (NEMA) categories. Most VFDs are either NEMA 1 or NEMA 12. NEMA 1 VFDs are meant for indoor applications and have side vents to allow for better airflow. These vents provide some degree of protection against solid foreign objects, but they do allow dust to accumulate inside the unit and on the vents themselves. This can prevent heat sinks and circulating fans from cooling the VFD unit. They require regular cleaning so the material doesn’t build up enough to impede airflow or jeopardize performance.

In contrast to NEMA 1 units, NEMA 12 VFDs are closed units that are sealed against dust and debris.

Keeping VFDs Dry

Like most electronics, VFDs are vulnerable in the presence of moisture. Protecting storage spaces with dehumidifiers helps keep the ambient humidity level low enough to reduce the risk of corrosion. NEMA 12 units with sealed casings are safer from incidental drips and splashes but should still be regularly monitored to keep water exposure to a minimum.

NEMA 1 VFDs are even more vulnerable to water because they have open side vents. The open vents and unsealed cover mean that moisture can easily get inside the unit and cause corrosion. Even water dripping from a nearby dehumidifier unit can be enough to ruin the device, so it’s important to plan the space correctly and regularly inspect on-site VFDs.

Keeping VFD Connections Tight

Variable frequency drives require tight connections to perform. While the units themselves may not be moved very often, the connections may loosen over time due to mechanical vibration, heat cycles, or even incidental movement throughout long periods of time. Facility managers should have the connections inspected regularly to check for loose connections or overtightening, as over-tightening and re-torquing the connection screws can cause malfunctions similar to loose connections.

Each of these three requirements can be met by adhering to strict preventative maintenance schedules. Malfunctions develop over time and out of sight, so it can be difficult to troubleshoot electronic problems and uncover underlying issues with VFDs after something goes wrong. Regular inspections stop the problems from developing in the first place.

Function of VFD Maintenance

VFD maintenance ensures that the units stay safe from external factors such as water and debris, as well as faulty internal mechanics. Good maintenance practices include visual inspections, regular cleanings, connection checks, and replacing parts before they start to impede good performance. For example, the cooling fans need to be replaced every three to five years, and the main bus capacitors should be replaced every seven years. Maintaining both a diligent schedule and an accurate record of parts replacements is essential.

Aside from parts replacement schedules, general maintenance requirements can be broken down into weekly, monthly, and annual cycles:

Weekly

Over the course of every week, workers should be on the alert for unusual noises. At least once a week, inspectors should create a report with the details of the VFD’s environment, including the temperature and humidity, DC bus voltage and output voltage, and the current and frequency. That report should also document the VFD’s monitored temperature to provide long-term data about the device’s health and maintenance needs.

Monthly

Each month, the filters should be cleaned or replaced. This includes the filters for any dehumidifier units, general ventilation, and filters in storage cases for the VFDs.

Annually

Once a year, the VFDs should undergo more thorough maintenance. This includes:
- Cleaning the unit. Vacuum the vents and storage space, and clean or replace the filters. VFDs should not be cleaned with any solvents or water-based cleaning tools.
- Inspecting the parts. Tighten the connections and terminal blocks, check the power supplies, and refer to the parts replacement schedule for any needed work. The DC bus should also be checked with an oscilloscope to check the Vdc ripple, but only trained professionals should handle this step.
Benefits of Utilizing Preventative VFD Maintenance

Regular preventative maintenance helps all electronics run longer and provide more consistent performance. VFDs benefit from regular maintenance, especially if they have open side vents, that may allow foreign objects or moisture to contaminate the inside of the housing. This, in turn, minimizes replacement costs and critical failures that lead to unexpected downtime.

Maintaining the VFDs also allows them to perform with greater control and the capacity to meet different load requirements. Depending on your state and locality, your energy provider might also provide rebates for using and regularly maintaining variable frequency drives.

Preventative Maintenance Support From Renown Electric

Consistent preventative maintenance is a good practice for all electronic equipment, especially when it comes to electric motors and moving parts. Keeping VFDs clean, dry, and well-connected leads to better performance and fewer unexpected repair and replacement costs.

Renown Electric is here to help keep your VFDs in excellent operational condition. We have specialized in electric motor repairs and preventative maintenance services for over 35 years, and we serve companies around the globe. Our company is ISO 9001:2015 certified, and we provide high-quality electric motor services for the following industries:
- Automotive
- Energy and power
- Industrial manufacturing
- Governments
- Marine
- Oil and gas
- Railways and transportation
- Safety equipment
- Wastewater management
Contact us today to learn more about how we can help keep your electric motors and equipment running smoothly.
COVID-19 – Preventative Measures & Ongoing Services
March 17, 2020 5:17 pm Leave a Comment

COVID Protocols in Effect:

Renown Electric will be watching closely as the global situation with COVID-19 continues to evolve. We wanted to reach out to Customers and Suppliers to let them know what we are doing to manage and combat this or any other virus.

Renown Electric Motors and Repair Inc. is putting into place preventative measures in our facilities. Any employee who chooses to travel via commercial airline or on a cruise ship for personal reasons will be required to remain at home for 14 days after a return to Canada.

Furthermore, any employees showing signs of illness will not be permitted to work until medical clearance is obtained. The health and safety of our Customers, Suppliers, and Teammates continue to be Renown Electric’s highest priority.

Renown is working closely with our workers, service crews, and drivers to ensure frequent hand washing using a sanitizing agent and wear PPE as required. Sanitation of all high touch surfaces in our workshop, including tools, instruments, and equipment. The health of our employees, suppliers, customers, and all Canadians is of most importance.

Being classified as an essential business, Renown Electric continues to provide emergency on-site and in- shop repair services during the COVID-19 outbreak to customers, utility companies like power generations, municipal water, and other essential services, commercial and industrial. We will remain staffed, are responding to emergency calls, and our staffing levels will be made based on government recommendations.

Testing as a screening tool has its limitations. Mandatory vaccines focus on primary prevention by concentrating on eliminating the risk. We are working closely with our workers, service crews, and drivers to ensure all mandates on COVID-19 are observed.

The health and safety of our Customers, Suppliers, and Teammates continue to be Renown Electric’s highest priority by our obligations under the Occupational Health and Safety Act, from the hazard of COVID-19. Vaccination is a critical element in the protection of employees against the risk of COVID-19.

In response to customers’ inquiries that Renown received regarding prior notice of the Contractors COVID 19 Vaccinations Compliance Policy, a Declaration or Attestation will be signed and acknowledged. All Renown service crews who render on-site jobs, drivers, and personnel who interact in person are fully vaccinated and comply with our customers’ Vaccination Policy. Proof of vaccination is available upon request.

Social Protocol Requirements:

Renown Electric posts a Social Distancing Protocol (SDP) at or near the entrance of each facility that is easily viewable by the public and employees
Must also provide a copy of SDP to each employee who performs any work at the facility Renown Electric must also provide a copy of SDP to authorities upon demand

Sincerely,

Renown Electric Motors & Repair Inc.
Monitoring Machine Health by Oil Analysis
February 6, 2020 10:30 am Leave a Comment

Machine wear caused by inadequate lubricant performance costs industries billions of dollars every year in part repair and replacement. For this reason, early detection of warning signs in your equipment is absolutely critical. Fortunately, analyzing key fluids such as lubricants in components can provide valuable insights into the condition of machinery.

Rotating parts are constantly in contact with each other, and if left unmaintained, this constant contact will degrade a machines’ performance. As components wear down, small particles and debris contaminate the lubricating oil, affecting machine performance and reliability. Thus, successfully monitoring a motor’s oil contamination levels will provide an accurate picture of its health, helping you form a more efficient maintenance and repair schedule.

Our Process

Because oil contamination is one of the critical indicators of rotating machinery’s condition, proper oil analysis ensures the development of accurate preventative maintenance schedules. Proper oil analysis involves drawing oil samples from the equipment and inspecting it closely for the presence of foreign matter.

To ensure the reliability of analysis results, maintenance technicians regularly draw oil samples after the target component reaches its operating temperature. Technicians also take several samples at the same point for maximum accuracy.

Technicians then carefully examine oil samples using a variety of techniques and instruments. If they detect contamination, the part undergoes a comprehensive particle-wear analysis, which assesses various properties of the sample including particle shape, particle count/distribution, and ferrous particle composition.

Technicians also analyze fluid properties such as viscosity and oxidation levels to detect the presence of contamination. Oil analysis, when performed correctly, can detect component wear up to three months before catastrophic failure.

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Better Analysis Ensures Better Performance

Oil analysis helps determine baseline levels for normal system wear. Upon establishing the baseline, technicians can quickly and easily diagnose system issues from subsequent testing. One of the main components of oil analysis, the particle wear analysis, allows technicians to classify impurities, determine the rate of wear, and measure the amount of contamination in the system.

Successful oil analysis is particularly important for the early detection of in-service oil contamination, which can ultimately result in significant maintenance cost savings and increased productivity due to increased machinery uptime.

Why Choose Renown for Your Oil Analysis?

For over 30 years, Renown Electric technicians have been at the forefront of providing in-service analysis of oil for various rotating equipment. We use state-of-the-art equipment to thoroughly analyze lubrication oil and other fluids to develop an in-depth understanding of the condition of machinery components.

Our ISO 9001:2015–certified quality management systems ensure that we test products according to the highest industry quality standards. We’ll also help develop proactive motor maintenance programs that will guarantee the equipment’s longevity.

To learn more about our preventative maintenance methodology, contact Renown Electric at your earliest convenience. Our representatives are available 24 hours a day.

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Motor Rewinding 101: How You Can Benefit
October 30, 2019 5:54 pm Leave a Comment

Like all pieces of machinery, equipment motors are subject to wear and tear with the passage of time. If you find that the motor in your equipment is starting to operate inefficiently, that is typically an indicator that the deterioration process has begun.

If your motor fails, or deteriorates to the point of impending failure, there are two basic options open to you that can resolve the problem:
- Motor replacement
- Motor rewinding
Before you make a final decision, you should consult with an expert after he or she has performed a thorough diagnosis of the motor. While motor replacement is the preferred option in many cases, there are also compelling reasons to consider motor rewinding—an armature winding process designed to restore the motor to optimal efficiency. This blog will discuss the two main reasons to consider rewinding over replacement.

#1: It’s Good for the Environment

Electric motors use a lot of power in day-to-day operations. While energy prices continually fluctuate, you can expect that an electric motor’s kilowatt usage will almost always add up to a significant cost.

Nevertheless, buying a new electric motor will typically leave a much larger carbon footprint than rewinding an older one currently in use. All of the old engine’s parts and materials are essentially recycled during the rewinding procedure.

Even though many companies that rely on equipment powered by electric motors concerned at the thought of engine failure—or even reduced efficiency—they often fail to take into account the environmental impact of buying a new motor as a replacement. While rewinding is an intricate process that requires extensive expertise, motor technicians have developed cutting-edge techniques to improve the procedure’s efficacy and ensure that rewound motors return to their original efficiency level.

Motor rewinding is not only more cost-effective than replacement, but it is also the eco-friendlier choice between the two as it bypasses the environmental toll that production of an entirely new unit would incur.

#2: Low Operating Cost

The motor rewinding process only costs approximately 40% of the price tag for a brand new unit, making it an attractive option for companies that place a high priority on thriftiness. These savings apply to both small motors and those found in larger machines, such as enclosed fan-cooled motors that use 100 horsepower or more.

Motor rewinding is not a viable option for all motors. For instance, if the motor’s laminations (or magnetic core) are damaged, then rewinding may not work. The same applies to motors that have experienced bearing failure. However, if the magnetic core is undamaged, then rewinding is a sensible and highly affordable option.

#3 Improved Efficiency

The myth that motor rewinding leads to a loss in efficiency is a concept that has been disproven as rewinding processes have evolved. Modern rewinding techniques will often improve, rather than reduce, the efficiency of electric motors.

It’s important to have a qualified professional perform the actual rewinding process to ensure optimal results. For example, they may need to remove old and damaged coils during the rewinding procedure and replace them with new coils to ensure that the motor generates power within proper tolerances.

Partnering with Motor Rewinding Experts

For 30 years, Renown Electric has worked with customers from diverse industries to lower costs from electric motor rebuilding and rewinding while ensuring that their machines operate at peak efficiency. Our team of motor rewinding experts has the requisite skills and experience needed to deliver high quality work with quick turnaround times.

Contact Us today if you’d like to learn more about the services we offer and the benefits of partnering with us.
Top Benefits of Using Laser Alignment for Motor Repairs
September 9, 2019 8:36 pm Leave a Comment

The alignment of a motor’s structural and mechanical elements influences its performance and longevity. Using laser alignment technology to facilitate motor repair and maintenance operations allows companies to ensure that parts are properly aligned and make adjustments as necessary.

Laser alignment uses laser instruments, such as transmitters and receivers, to measure the alignment (or misalignment) of components with a high level of accuracy and to the tightest possible tolerances. When used as part of a scheduled motor maintenance program, laser alignment services offer several benefits.

Avoiding Costly Downtime and Production Losses

In addition to inadequate maintenance and lubrication, improper alignment of motor components contributes to an increased risk of equipment breakdown. Breakdowns lead to extended unplanned downtime periods, disrupted production schedules, and more significant production losses, decreasing the overall productivity and profitability of a facility. Fortunately, these costly consequences can be avoided using laser alignment.

By maintaining proper alignment of motor components, laser alignment prevents seals, bearings, belts, and other critical parts from experiencing greater levels of stress (including from friction, noise, and vibration) during operation. These stress levels can lead to premature component deterioration and failure and subsequent equipment breakdown. Laser alignment technology prevents these breakdowns, improving productivity and profitability and facilitating more optimal machine performance.

Improving Accuracy, Speed, and Repeatability

Older alignment technologies—such as dial gauges and straight edge methods—require long setup periods while still delivering inaccurate results due to reading errors from low resolution or dial hand sticking and dropping. Comparatively, the high-resolution, non-contact design of laser alignment systems provides more precise, accurate, and consistent readings down to 0.0001 mm tolerances, as well as direct report generation for quicker delivery, interpretation, and analysis.

Additionally, while older alignment methods typically require specialized operators with extensive training and experience, the laser alignment method has a much smaller learning curve and allows for less experienced operators to produce accurate and consistent results. Combined with the quick setup time, the ease of use of laser alignment makes it an easily repeatable process, enabling its frequent use in regular preventative maintenance programs.

Contact Renown Electric for Laser Alignment Solutions

Employing preventative maintenance measures, such as frequent alignment of shafts, sheaves, pulleys, gearboxes, and other components, helps avoid premature motor component wear and malfunction. In particular, laser alignment is a cost-effective method that contributes to improved production output and decreased maintenance costs.

At Renown Electric, our exceptional team of laser alignment experts is dedicated to preventing the premature fatigue and failure of motor parts and optimizing the performance of motor equipment. Our technicians measure component alignment to the tightest tolerances available, as well as provide realignment services consistent with client specifications and stringent industry standards, including ISO 9001:2015.

Contact us today to learn more about how our laser alignment solutions can benefit your motor repair and maintenance applications.
What’s the Difference Between Static & Dynamic Balancing
May 30, 2019 12:30 pm Leave a Comment
Rotating parts in machines should be free of vibration to ensure their smooth operation and long service life. Reducing the vibration in your machinery relies on a number of factors, like a smooth rotating shaft, good bearing condition, and proper lubrication, but one of the most important ways to guarantee vibration-free operation is through symmetrical mass distribution.

Although designers strive to create machinery to be as symmetrical as possible, in practice, all rotating bodies have weight asymmetries about the axis of rotation, and this causes vibration. Vibrations cause the machine to be noisy and reduce the life of its parts, especially the bearings. Vibration can also cause structural fatigue stress, and excessive vibration can lead to dangerous operating conditions from unexpected catastrophic failures.

Static and dynamic balancing of motors and generators will make them run smoother and operate more efficiently for longer periods of time. Balancing will also improve the working environment of the machine operators by reducing noise, minimizing vibrations, and eliminating the risk of dangerous catastrophic failures.

Static Unbalance

Static unbalance is the simplest form of unbalance. It is equivalent to a single heavy spot in the rotor. It is called static because it will be present even when the rotor is not spinning. Static balancing is necessary to prevent a stationary object from rolling. When an object’s center of gravity is on its axis of rotation, it will remain stationary. But if the center of gravity is not on its axis of rotation, it tends to roll, and a braking force is necessary to keep it stationary. A rotating body at rest is in static balance if it continues to be at rest at all angular positions of its axis. Static unbalance can be corrected with a single plane balance.

Dynamic Unbalance

A rotor will actually have an infinite number of imbalances distributed at random along its axis of rotation. This can be expressed as 2 resultant unbalances acting in 2 arbitrary balance planes. They differ in magnitude and do not have clearly defined angular positions. As this state of unbalance can only be determined comprehensively when the component is rotating, it is referred to as dynamic unbalance. Dynamic unbalance can be corrected with a 2 plane balance.

Asymmetric mass distribution about the axis of rotation causes a rotating body to vibrate. Dynamic balancing is the method of measuring the imbalance with sensitive electronic equipment while a body rotates rapidly. This process also tests vibration by adding or removing weight from the rotating body to align the effective mass center with the axis of rotation. When the effective mass center is at the axis of rotation, there are no residual centrifugal forces, and vibration is eliminated.

What’s the Difference?

A rotating object must have static balance before it can have dynamic balance. But the object can have dynamic imbalance even when it is statically balanced. If that is the case, the object will tend to vibrate while rotating even though it has no tendency to roll while stationary.

In other words, dynamic balance can be thought of as the ability of an object to balance while in motion. A perfectly dynamically balanced body requires just the force supporting its weight to make it stay in place while rotating; a dynamically unbalanced body in rotation requires external forces to counter the wobble from vibrations.

Working With Renown

Correct balance and alignment of rotating parts are necessary to ensure optimal performance and long service life. Renown Electric has offered both on-site and in-house dynamic balancing services for over 30 years. We specialize in providing preventative and predictive maintenance services to minimize the wear and tear that can result from excess machine vibration. Our customers use our measurement and calibration services to dynamically balance rotating equipment, helping ensure that it works efficiently and maximizes its life span.

We are an ISO 9001:2015–registered company. Our ISO 18436-2–certified specialists conduct residual imbalance analysis per DIN ISO 21940. Our state-of-the-art dynamic balancing equipment includes the VIBXPERT II balancing system.

To learn more about the benefits of Renown’s dynamic balancing services and our other preventative and predictive maintenance programs, please contact us today. We’re available around the clock to assist you.