Performance Improvement for PMSM Drives with Internal Model Based State Feedback Control Strategy

The traditional proportional-integral (PI) controller suffers from either large overshoot or slow dynamic response. For performance improvement, an internal model based state feedback control strategy is proposed in this paper, adopting the linear quadratic (LQ) optimal control for permanent magnetic synchronous motor (PMSM) drives. The parameters of the cost function are selected as functions of desired bandwidth. The proposed control method is verified on the sensorless PMSM drive, and the expected performance is confirmed by the experimental results of a single rotor compressor drive system.