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Wound rotor motor tips for failure analysis, repair and testing

Publication date: 
November 2012
Chuck Yung, EASA Senior Technical Support Specialist
Type of media: 

Wound rotor (WR) motors represent only a small fraction of all electric motors in service. In reviewing the EASA Technical Support call logs, one would conclude that there are many more wound rotor motors in service. Because many of us do not work on wound rotor motors often, it is understandable that not everyone has a clear understanding of how they differ from a squirrel cage motor. The purpose of this article is to dispel some misconceptions about how they work and to offer valuable tips for failure analysis, repair and testing. Other topics covered include:

  • Secondary voltage
  • Crane applications
  • Testing tips, after assembly
AC motors
Wound rotor motors
Motor testing
Troubleshooting & failure analysis