摘要：针对基于滑模观测器的永磁同步电动机的无位置传感器存在的抖振问题,采用了饱和函数替代开关函数。通过引进饱和函数降低抖振，然后从反电动势中提取转速和转子位置信号，减小计算转角和转速的误差和复杂性，最后利用 Matlab 平台对提出方法进行验证，实验结果表明改进的滑模观测器不仅鲁棒性强，而且在一定程度上抑制了抖振，在动态性能和精度上与传统滑模观测器比较有一定提高。
关键词：饱和函数；无位置传感器；永磁同步电机；滑模观测器

Abstract: Aimed at the chattering problem without position sensor of the permanent magnet synchronous motor based on sliding mode observer, the saturation function was adopted instead of switching function.   Saturation function was introduced to reduce chattering, then speed and rotor position signal were extracted from counter electromotive force, reduced the error of Angle and rotational speed calculation method and complexity，the method was reduced the error and complexity comparing with the traditional calculation method. Then a Matlab platform was built to validate this method, the experimental results showed that the improved sliding mode observer was strong robustness and inhibit the chattering to a certain extent, on the other hand it also couldimprovethe dynamic performance and the accuracy of the position-sensorless system.
Key words: saturation; positionsensorless ; PMSM；sliding mode observer