To make a motor workable again, an electric motor rewind can be completed, which saves the owner on the high cost of paying for a new one. A motor can also be rewound in an emergency, thus minimizing a customer’s downtime.
For example, if an AC motor fails, it usually means that the insulation or coils were damaged by excessive heat or contamination. To rewind a motor, the stationary part of the motor, called the stator, is baked in a controlled high temperature oven. This turns the insulation material to ash and allows the removal of the original coils. Once the stator is free of the coils, it can be cleaned, inspected and re-insulated. A technician then hand winds new coils and installs them in the stator. The rewound stator is then warmed in an oven, immersed in epoxy varnish and baked to cure. This is known as the dip and bake process, which bonds and protects the new coils.