Tom Bishop, P.E. 
EASA Technical Support Specialist
 
Have you ever had to deal with a rewound motor that had high no-load amps? That is almost a rhetori­cal question as most of us have experienced this situation. The focus of this article will be on steps to take before rewinding in order to avoid the condition of high amps after the rewind. 

Steps that should be performed on every AC stator rewind: 

1. Inspect the stator bore and rotor outside diameter for evidence of machining or damage. 
2. Record the original winding data exactly as found. 
3. Test the stator core before winding removal. 
4. Verify the winding data. 
5. Test the stator core after winding removal and cleaning. Applying these five steps will help avoid the vast majority of situations where a rewound motor will exhibit high no-load current. If these steps were not all followed and a motor has high no-load current, if possible, perform any steps above that were omitted. 

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Categories: Technical topics, AC motors, Design/theory/application, Repair procedures & tips

Tags: High no-load amps

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