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提出一种基于无速度传感器运行的永磁同步电机非线性控制方法.为了有效地估计转速和位置信息,构造一种新颖的级联式滑模速度观测器,以解决传统滑模观测采用低通滤波器的相位延迟问题.利用前级电流滑模观测器得到反电动势,后级反电动势滑模观测器获取转速和位置信息,利用李亚普诺夫理论进行稳定性分析.针对速度控制,提出利用带扩张状态观测器的滑模速度控制器取代PI调节器的方式提高系统的鲁棒性.仿真结果验证了所提出方法的有效性.
A novel nonlinear control method of permanent magnet synchronous motor based on speed sensorless operation is proposed.In order to effectively estimate rotational speed and position information, a novel cascade sliding mode velocity observer is constructed to solve the problem that traditional sliding mode observation uses low-pass Phase delay of the filter.The back-EMF is obtained by the previous-stage current sliding mode observer, and the back-EMF sliding-mode observer obtains the rotational speed and the position information, and the stability analysis is carried out by using Lyapunov theory.In view of the speed control, The sliding mode speed controller of the extended state observer replaces the PI regulator to improve the robustness of the system.The simulation results verify the effectiveness of the proposed method.