Position sensorless control system of SPMSM based on high frequency signal injection method with passive controller

In this study, a high-frequency pulsed voltage signal is injected into the d axis of the synchronous rotating frame of a surface-mounted permanent magnet synchronous motor (SPMSM) with insignificant salient pole effects. Through detection and analysis of the high-frequency current response signal at the stator side, the rotor position and speed information can be extracted to achieve sensorless control of the motor. A passive controller with a port-controlled Hamiltonian dissipative (PCHD) structure is designed by using the principle of energy forming and the method of interconnection-damping configuration. A 2.2-kW SPMSM experimental platform is built for experimental verification. The simulation results show that when the motor is miming at a low speed, the proposed pulse-induced high-frequency voltage signal injection method exhibits a higher accuracy of rotor position and speed estimation. The passive controller can suppress the fluctuation of the motor starting speed and demonstrates a better ability to resist load disturbance.