关键词: 永磁同步电机, 全局滑模控制, 双向衰减函数, 自适应趋近律

Abstract: In response to the problems of traditional global sliding mode control in permanent magnet synchronous motor (PMSM) applications,such as excessively long sliding surface evolution time,severe chattering,and the resulting decline in startup and speed regulation performance,current ripple,and torque pulsation,this paper proposes a speed control method combining improved global sliding mode control with adaptive approaching rate. By using a bidirectional decay function to optimize the time-varying nonlinear term, the sliding surface evolution speed was accelerated, improving the system ’ s dynamic response performance. An adaptive approaching rate was introduced to adjust the approaching speed according to the system state, effectively suppressing high-frequency chattering. Experimental results show that the sliding surface evolution time is reduced by 60% ( from 0. 02 s to 0. 005 s) ,and the proposed method significantly improves the current and torque performance under load step conditions while increasing PMSM response speed, reducing current fluctuation amplitude from 0. 5 r / min to a minimal level.

Key words: permanent magnet synchronous motor, global sliding mode control, bidirectional attenuation function, adaptive reaching law