Helpful Resources
About MDM
General Resources
Motor Selection
Motor Repair
Motor Related Trainings
System Optimization &
Plant Wide Energy Management
National & Regional Assistance

Helpful Resources - Motor Repair

Motor rewinds or repairs that are performed improperly or performed on a motor with significant damage have the potential to degrade its nameplate efficiency. Since the electrical cost to operate a motor over its lifetime is many times greater than its original purchase price, even a small decrease in motor efficiency can cause a significant increase in your total operating costs. However, best practice repair-rewinds, as defined by the ANSI/EASA AR 100 standard, return the motor to its nameplate efficiency. Therefore, making efficient best practice repair a priority can produce sizable cost savings. When it comes to rewinding motors, work with your local utility and motor service provider to develop and implement a repair policy that makes efficiency a priority. Several organizations have resources to help you get started.


Electrical Apparatus Service Association (EASA)
The Electrical Apparatus Service Association (EASA) is an international trade organization of over 2,100 electromechanical sales and service firms in 58 countries. Visit the EASA member finder webpage to locate an EASA member near you. Three additional resources available from EASA include:

ANSI/EASA AR 100-2010: Recommended Practice for the Repair of Rotating Electrical Apparatus: Developed by EASA and approved by the American National Standards Institute (ANSI), this concise 22 page document defines recommended repair practices by establishing guidelines for each step of electrical apparatus rewinding and rebuilding.

The Effect of Repair/Rewinding On Motor Efficiency; EASA/AEMT Rewind Study and Good Practice Guide: Developed by the Association of Electrical and Mechanical Trades (AEMT) and EASA, this 82 page document has two components:

  1. A study that provides detailed information about testing motor efficiency related to different repair scenarios, and concludes that repair does not degrade efficiency if done in accordance with best practices.
  2. A Best Practice Guide that provides an outline for repair methods that were used to achieve the study’s results.


Advanced Energy
Originally founded in 1980 by the North Carolina Utilities Commission, Advanced Energy is a nonprofit organization focused on energy efficiency for commercial and industrial markets, electric motors and drives, plug-in transportation and applied building science. Advanced Energy is home to nationally accredited laboratories that perform testing and applied research in all of the disciplines listed above.

Proven Excellence Verification (PEV): This service center certification program provides assurance that PEV's rigorous verification process has been undertaken to ensure best practice motor service and repair, including rewinds. To earn PEV certification service centers work with Advanced Energy to initially assess and evaluate the facility following the PEV Audit Checklist Summary, test and verify that proper motor repairs have been completed, and develop and implement an action plan to resolve any deficiencies. Visit Advanced Energy’s website to identify service centers with PEV certification or to learn about how you can get started in the program. You may also be interested in Guidelines to a Good Motor Repair a succinct, four page document that provides information for end users on partnering and communicating effectively with motor service centers because “good motor repair is a two-way street.”


Green Motors Practice Group
Established in 2005 with the help of the Northwest Energy Efficiency Alliance (NEEA) and independently owned motor service centers, the Green Motors Practice Group (GMPG) is a nonprofit organization with the objective to promote energy efficient motor systems and to differentiate member service centers' delivered finished products and services within the market. GMPG Certification indicates that the service center has the equipment and knowledge required to perform motor rewinds according to the Green Motor Repairing Specification. Currently, GMPG certified service centers operate in the western United States and British Columbia, and several utilities have partnered with GMPG to provide customers with incentives for motor rewinds completed following practices advocated by GMPG certified service centers. Visit the GMPG website to learn more and identify participating service centers and utilities.


MDM Webcast on Repair
Motor Management Truths and Consequences: Understanding Electric Motor Rewinds and Efficiency (May 2011). The slide presentation and webcast recording is available on the MDM website. The Webcast provides a presentation from Tom Bishop, of Electrical Apparatus Service Association (EASA) on motor rewinding and an overview of MDM tools and resources for informing repair vs. replace decisions. Presentation: Recording:


Literature from DOE EERE
The following motor repair resources are available through DOE’s EERE Advanced Manufacturing Office (AMO) online at the AMO website .

  • Tip Sheets
  • Case Studies
  • Technical Publications