Chuck Yung
EASA Senior Technical Support Specialist

Even though they comprise a small portion of electric motors in service, wound rotor motors are disproportionately represented in EASA’s tech support call volume. There are several misconceptions about how they work. This paper will describe how they are applied and explain several simple but critical tests for the repairer.

• What are the rotor leads used for?
• What is the purpose of the steps/resistance changes?
• How should you evaluate the completed repair?
• Common causes of failure and how to prove them to your customer
• Considerations and cautions for retrofitting a wound rotor motor with a VFD
• Identifying wave wound rotor connections

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