Why Electrical Motor Rewinding results in a loss of efficiency

Why Electrical Motor Rewinding results in a loss of efficiency

We answer the much-asked question of whether or not an Electrical Motor Rewinding results in a loss of efficiency.

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

Why can Electrical Motor Rewinding reduce efficiency?

An Electrical Motor Rewinding can be subjected to high temperature when the coil is stripped from the stator core prior to Electrical Motor 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 Electrical Motor Rewinding 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 Electrical Motor Rewinding for 45 years and our expertise means you can be assured your motor will be restored to at least its original efficiency.