How Rewinding Of An Electric Motor Is Carried Out


If your electric motor fails, there are two viable options: you either rewind or replace it. In the past, people were worried about rewinding a failed electric motor because it resulted in the reduction of its efficiency. This is far from the truth because an experienced electrician from a reputable service center can use the latest technology to rewind your failed electric motor and ensure it doesn't lose its efficiency.  So how are they able to achieve this? Below is a brief overview of what happens during the rewinding process.

Inspecting the stator

The first step that the electrician will undertake is to inspect the stator because motor failure can occur due to various reasons. One of the main causes of motor failure is the breaking down of the stator winding insulator as a result of the motor overheating regularly.  It is important to inspect the iron core of the stator to ascertain that it is not damaged. This is because attempting to rewind a damaged core will raise the motor's temperature and also reduce its efficiency.  In the long run, rewinding a damaged stator core increases the chances of future of motor failure.

Stator winding stripping

After ascertaining that the stator core is not damaged, the electrician will proceed to remove the original windings of the motor. Stripping of these windings can be carried out through various ways. Dry stripping simply means cutting off the ends of the windings and then pushing out the wires from these slots. This approach is suitable for those windings that are laced in place. If it is not possible to carry out dry stripping, the electrician will loosen the old windings by heating the stator in the oven. They will use lower temperatures during the heating process to avoid harming the inter-laminar insulation.

Conducting the core-loss test

After removing the older windings, the technician will carry out the core-loss test. This is to ascertain that the core was not damaged during the stripping process if high temperatures were used. The majority of the core tests available in the market will produce printouts that show the condition of the core. The electrician can also use a watt meter to measure certain parameters that will help in calculating the core loss manually.

Rewinding the motor

The electrician will manually insert the lap winding into your motor. This is not a difficult process because the service shop has all the necessary equipment and materials needed to undertake this task. When replacing the winding stator, the technician will use a similar wire size, span and coil extension to the ones in the original motor. Careful fitting of a new winding will maintain the energy efficiency of the motor or even increase it significantly in some cases.

Rewinding your electric motor when it fails reduces the production downtime, as it can be done in the shortest time possible. As long as it is carried out by an experienced professional, rewinding will not interfere with the energy efficiency of the motor.

For more information, contact Hackworth Electric Motors Inc or a similar company.


2 August 2016

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