When it comes to motors, how hot is hot? Temperatures that are too high affect machine performace, life

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Publication date:

June 2011

Author:

Jim Bryan, EASA Technical Support Specialist

We often hear from members that a customer has reported that a motor that has been repaired is now running hot. We always ask how hot and the reply frequently is: “Well, I can’t hold my hand on it!” Let’s think about that answer for a minute. The typical human can tolerate about 60-65º C (140-150º F) depending on calluses, threshold of pain, how many people are watching, etc. ...

Temperature is often the Number 1 enemy of the electric motor. Care must be taken in the design, application and maintenance of these machines to optimize their performance and life. All that said, it is unsafe to lay your hand on a motor to see if it is too hot; get a thermometer instead.

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