关键词: 永磁同步电机, 无传感器控制, 非奇异快速终端滑模观测器, 自适应控制, 李雅普诺夫理论

Abstract: To mitigate the chattering effect and enhance the estimation precision of the sliding mode observer in the sensorless control of permanent magnet synchronous motor, an adaptive nonsingular fast terminal sliding mode observer was proposed. This approach was grounded in terminal sliding mode control theory,incorporating the design of a nonsingular fast terminal sliding surface alongside its corresponding control law. An adaptive control strategy was integrated to achieve precise tracking and dynamic adjustment of the back electromotive force. The system’ s stability was validated using Lyapunov theory, the speed and rotor position were extracted through a phase-locked loop. Experimental results showed that the proposed method reduces the speed estimation error by 60 % compared to the traditional sliding mode observer and by 30 % compared to the nonsingular fast terminal sliding mode observer, significantly improving the estimation accuracy.

Key words: permanent magnet synchronous motor,sensorless control,nonsingular fast terminal sliding mode observer, adaptive control,Lyapunov theory