To solve the problem of sensorless vector control for permanent magnet synchronous motors, a sliding mode observer was constructed and the continuous position was obtained by means of the sliding mode control theory in this paper.The switch function was replaced by the saturation function to solve the problem of the chattering in the sliding mode observer.Finally, Simulation and experiment proves the effectiveness of the proposed improved sliding mode observer.%针对永磁同步电动机的无位置传感器矢量控制问题,借助于滑模变结构控制理论,通过构造滑模观测器的方法,实现了永磁同步电动机连续转子位置的观测.针对滑模控制固有的抖振问题,通过采用饱和函数替代切换函数的方法,有效抑制了抖振问题对转子位置观测性能的影响.最后通过仿真和实验验证了所实现的改进滑模观测器的有效性.
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