改进滑模模型参考自适应的PMSM无传感控制

针对MRAS（模型参考自适应）观测器对PMSM（永磁同步电机）参数变化和外部干扰敏感的缺点，设计了一种用于PMSM无传感控制的软开关滑模模型参考自适应观测器。该观测器将滑模控制与MRAS相结合，并构造了边界层可变的正弦饱和函数，以抑制由于滑模控制引起的系统抖动，增强系统鲁棒性。同时引入sigmoid函数，以提高滑模软切换速度控制器的稳定性。实验仿真结果表明，软开关滑模模型参考自适应控制不仅可以实现边界层内的快速收敛、弱化抖动，而且跟踪能力强。

Sensorless control of PMSM based on improved sliding-mode model reference adaptive system method

Due to the disadvantage that model reference adaptive observer(MARS) is sensitive to parameter variations of PMSM and external disturbances, this paper developed a soft-switched sliding mode model reference adaptive observer for PMSM sensorless control. The observer combined the sliding mode control with MRAS. And constructing a variable sinusoidal saturation function was to enhance the robustness of the system and effectively reduce the chattering phenomenon. At the same time, introducing the sigmoid function was to improve the stability of the sliding mode soft switching speed controller. The simulation results show that the mode model reference adaptive control based on soft-switching sliding can achieve convergence faster, reduce the chattering phenomenon and improve the tracking performance.