关键词: 滑模观测器, 永磁同步电机, 无传感器, 抖振, 反电动势反馈

Abstract: Aiming at the problems of system chattering and large errors in rotational speed and position of traditional sliding-mode observer (SMO) algorithm for sensorless controlled permanent magnet synchronous motor, an improved SMO algorithm is proposed. The estimated back electromotive force feedback is introduced, the saturation function is used instead of the switching function, and the variable reaching rate is used instead of the fixed sliding mode gain. The reliability of the system is verified by Lyapunov method, and the accurate rotor position and rotational speed information are obtained by phase-locked loop (PLL). Finally, Simulink is used to build simulation model, and related experiments are carried out. The simulation and experimental results show that the improved algorithm’s control performance is more superior.

Key words: sliding-mode observer, permanent magnet synchronous motor, sensorless, ?chattering, back electromotive force feedback