关键词: 永磁同步电机, 位置传感器故障保护, 扩张状态观测器, 转子角度估算

Abstract: Aiming to the extreme risks caused by the position sensor fault, during the operation of permanent magnet synchronous motor (PMSM), and problems of limited speed range adaptabilities of the traditional sensorless control method, a position sensor fault protection control method of PMSM was proposed by applying the extended state observer (ESO) method to position sensor fault protection control method, and combining the control methods of position sensor sensorless. Based on the ESO method, the rotor anglewas estimated by observing the motor back electromotive, the position sensor fault was judgedby the error between the measured and the estimated rotor position, and the smooth switching between position sensor control and angle estimation control was realized by first-order low-pass filter. The theoretical analysis and software design were carried out, and the experimental bench was built for experimental verification. Experimental results show that the proposed method is of good stability and high adaptability, and can realize accurate observation of rotor position of PMSM and fault protection function of position sensor.

Key words: permanent magnet synchronous motor(PMSM), position sensor fault protection control, extended state observer (ESO), rotor angle estimation