Research on sensorless control system of permanent magnet synchronous motor

The research on the sensorless control of PMSM by using control algorithm is a hot topic in the field of motor control. A PMSM sensorless control system based on low speed pulse high frequency stator flux injection is proposed. The traditional stator flux estimator is improved. The high frequency signal is introduced into the low pass filter to improve the accuracy of the stator flux estimator in the low speed operation of the motor. In view of the situation that the control system without position sensor is susceptible to torque ripple in PMSM, the disturbance torque observer is used to suppress the voltage error caused by the disturbance torque. In this paper, the PMSM rotor position and speed observer is designed, and the magnetic pole judgment criterion is designed to improve the observation accuracy of the observer. Finally, experiments are carried out to verily the effectiveness and feasibility of the proposed scheme.