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Does rewinding an electric motor reduce efficiency?

The question of whether an electric motor rewind reduces its efficiency has long been debated. Some people believe that having an electric motor rewound will always lead to a loss of efficiency, but this is not necessarily the case.

Why can a motor rewind reduce efficiency?

An electric motor can be subjected to high temperature when the coil is stripped from the stator core prior to rewinding. This temperature rise can affect the electrical characteristics of the stator core steel, leading to higher iron losses and therefore lowering the motor’s efficiency.

How can efficiency reduction be avoided?

As long as the engineer rewinds the motor to manufacturer specifications - i.e. using the exact size and type of winding that was removed - its original performance will be achieved. This requires knowledge and patience, so should not be rushed or carried out by an inexperienced engineer.

Is a motor rewind worth it?

Studies have revealed that, if carried out carefully by a skilled, experienced professional with high-quality materials, an electric motor rewind should not result in a loss of efficiency. In fact, a rewind may actually increase a motor’s efficiency - if thicker winding wire is installed, for instance. The belief that multiple rewinds result in cumulative efficiency loss is also untrue, providing a motor is always repaired to the same standard.

Gibbons has been rewinding electric motors for 45 years and our expertise means you can be assured your motor will be restored to at least its original efficiency.

So for all motor rewind enquiries, call us on 01621868138 or email and we’ll be glad to help.

Electric Motors

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