Study on initial rotor position identification of permanent magnet synchronous motor based on high frequency signal injection

The estimation result of the initial rotor position for permanent magnet synchronous motor (SPMSM) maybe reverse with traditional pulsing high-frequency voltage signal injection method, since this method cannot recognize N/S rotor polarity. A new method was proposed to identify rotor initial position based on motor saliency image. N/S polarity was distinguished by analyzing the second high-frequency current component with rotor position error information, and then initial rotor position can be easily obtained. The experiment was implemented on a permanent magnet synchronous motor with salient pole. The experimental results verified the proposed approach and achieved the valid rotor position polarity identification.