Torque Ripple Suppression of Open-Winding PMSMs by Current Injection Considering Magnetic Saturation

摘要

This paper proposes a modified harmonic currents injection strategy for permanent magnet synchronous motors (PMSMs) with open winding topology to suppress torque ripples considering magnetic saturation. Harmonic current injection strategy is commonly used to reduce torque ripples generated by interaction between non-sinusoidal flux linkage and sinusoidal current. However, the influence of magnetic saturation, which is one of the major causes of flux linkage and back-EMF distortion, is not considered by the current control schemes. In this paper, a modified harmonic current injection strategy is proposed to adapt magnetic saturation condition. It is demonstrated by numerical simulation results that the proposed harmonic compensation method can effectively reduce the torque ripples.