关键词: 永磁同步电机, 无传感器控制, 加权融合, 扩展卡尔曼滤波

Abstract: In the sensorless control of permanent magnet synchronous motors in the full speed domain, different control algorithms are usually used for different speed ranges, and ensuring smooth switching between different control algorithms is a prerequisite for achieving stable operation in the full speed domain. High frequency voltage injection and extended Kalman filter were used to observe rotor velocity and angle in zero low speed domain and medium high speed domain respectively. In order to achieve smooth switching between the two algorithms, a switching strategy based on variance weighted fusion of observed values was proposed. Compared with the traditional threshold switching strategy, the stability and control accuracy of permanent magnet synchronous motor in the full speed domain were improved. The simulation results demonstrate the feasibility and effectiveness of the sensorless control strategy in the full speed domain of permanent magnet synchronous motor.

Key words: permanent magnet synchronous motor ( PMSM), sensorless control, weighted fusion, extended Kalman filter( EKF)