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What does it mean when a rewound motor runs "hot"? Items to check to make sure it's operating properly

  • July 2008
  • Number of views: 353
  • Article rating: No rating

“We have rewound a motor, and now that it is back in service, our cus­tomer says it’s running hot. The frame is getting so hot that he can’t put his hand on it, and now he is blaming us for rewinding the motor incorrectly!” 

Has this ever happened to you? You have rewound a motor without changing the design at all; you tested the motor before you sent it out, and everything appeared to be fine. But now your customer wants you to fig­ure out what is wrong, or rewind the motor again. 

Before you consider this, there are a few things to check to see if the motor is, in fact, running properly. It is quite possible that the motor ran “hot” before it failed, but what are the chances that someone on-site put their hand to the frame before it had to be rewound? 

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Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides a great marketing tool for your service center! Use it to provide end users with information that will help them obtain the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

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The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

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ANSI/EASA AR100-2015

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Recommended Practice for the Repair of Rotating Electrical Apparatus
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