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Increase motor reliability by monitoring and reducing operating temperature

Publication: 
Plant Engineering
Publication date: 
November 2013
Author: 
Tom Bishop, P.E., EASA Senior Technical Support Specialist

Although summer heat waves provide poignant reminders that “heat kills,” high temperatures can harm electric motors as well as people. In fact, operating a three-phase induction motor at just 10°C above its rated temperature can shorten its life by half. Whether your facility has thousands of motors or just a few, regularly checking the operating temperature of critical motors will pay huge dividends—by preventing unexpected shutdowns and extending motor life.

Topics covered include:

  • Key terms
  • Ambient temperature + Temperature rise = Hot temperature
  • Resistance method of determining temperature rise
  • Determining temperature rise using detectors
  • Adjusting for ambient