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Test run tips: Common causes for high no-load current on rewound motors

  • June 2002
  • Number of views: 848
  • Article rating: No rating

Cyndi Nyberg
EASA Technical Support Specialist 

When a motor is test run without a load after it has been rewound, one of the questions we are asked is why the amps are too high, even higher than the nameplate full load. Here are a few of the common factors to consider. 

First, if there is a problem with the data, it is im­portant to realize that not every service center has access to EASA’s extensive database and technical knowledge. Of course, some motor failures are so catastrophic that it is impossible to determine the connection or even the turns per coil for a particu­lar winding. Without access to the EASA database, if factory data cannot be obtained, the service cen­ter is left to make assumptions. If this is the case, you may have inherited someone else’s problem if they misinterpreted the data. 

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Categories: Testing, Motor testing
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