An Enhanced High Frequency Pulsating Voltage Injection Method Based on Immune Algorithm for Sensorless IPMSM Drives

The fixed bandwidth filter is used in traditional high frequency pulsating voltage injection (HFPVI) based on a sensorless vector control scheme for permanent magnet synchronous motors (PMSM) drives, which restricts the working speed region and dynamic performance of HFPVI. In order to solve this problem, a novel method of HFPVI by applying the immune algorithm (IA) is proposed in this paper. The IA is applied into HFPVI, the bandwidth of filter can be adjusted on-line in the demodulation process. Thus, the working speed region of HFPVI is enlarged, and the dynamic performance of sensorless PMSM drive is improved by using the IA. The correctness and the effectiveness of the proposed method are verified by the various experimental results.