Zero Torque Three Phase Integrated On-board Charger by Multi-Elements Motor Torque Cancellation

Integrated on-board charger (IOBC) utilizes existing motor drive hardware to construct the battery charger in electric vehicles (EV), which is an effective way to reduce the cost of EV. However, the conventional three phase motor drive system is considered to be incapable of implementing three phase IOBC due to the difficulty in torque suppression during charging or discharging. In this paper, zero torque three phase IOBC is achieved by a simple motor winding reconfiguration method. The proposed method is suitable for any type of motor. The only requirement of this method is that the elements of motor need to be larger than 1. Simulation and experiment are used to verify the method.