An integrated split-phase dual-inverter permanent magnet motor drive and battery charger for grid-connected electric or hybrid vehicles

Multi-phase machines have some features such as reduced power electronic components rating, reduced torque ripple, and increased reliability that make them a favorable option in some applications, for instance in the area of high-power drive systems. A combined motor drive and battery charger based on a split-phase interior permanent magnet synchronous motor and dual inverters is proposed and explained in this paper. By connecting the two motor winding star points to a single-phase ac supply, it is possible to charge the battery through the inverters from a commonly available single-phase outlet. In this way, a separate battery charger is not needed. A double dq model of the motor is presented and based upon a maximum torque per ampere control strategy is used for the traction mode. To eliminate the look up table to obtain the reference value of the current q component from the torque error, a linearized version of the controller is used that is explained. The system operation in the charging mode including the equivalent circuit and inverter control is also explained. Moreover, simulation results are provided to verify the proper operation of the proposed system.