Electric motor repair for low voltage induction motors in PWM inverter duty environments

It is necessary to present a motor repair specification for the repair of low voltage polyphase induction motors intended for PWM inverter application. The specification must approach electric motor repair from the standpoint of maintaining efficiency, not damaging the electromechanical components of the machine, and improving the insulation system. Through the use of the specification, an electric motor should be able to withstand most inverter duty environments upon completion of repair and commission. The purpose of this paper is to present a recommended repair specification meant to reduce the chance of inverter duty failure on repaired low voltage polyphase induction motors.