基于改进型滑模观测器的永磁同步电机无位置传感器控制

永磁同步电机无位置传感器控制技术通常使用滑模观测器观测反电动势,进而获取转子位置和速度信息.为提升滑模观测器的性能,本文设计了一种改进型自适应超螺旋滑模观测器.首先,文章在超螺旋滑模观测器结构中增加观测误差的线性项,以提高观测器的动态性能.接着,为解决观测器增益在不同速域下参数不匹配的问题,本文提出一种观测器参数自适应调整策略,提升了观测器参数鲁棒性.在此基础上,采用同步参考系滤波器滤除输出信号的高次谐波,进一步提高观测精度.最后,仿真结果表明,与传统方法相比,本文提出的方法观测性能更好,鲁棒性更强.

Sensorless control method of permanent magnet synchronous motor based on a modified sliding-mode observer

The sensorless control technology of permanent magnet synchronous motor usually uses sliding-mode observer to observe the back electromotive force, so as to obtain rotor position and speed information. In order to improve the performance of sliding-mode observer, a modified adaptive super-twisting sliding-mode observer is designed. Firstly, the linear term of observation error is added to the structure of super-twisting sliding-mode observer, in order to improve the dynamic performance of the observer. Then, to solve the problem of parameters mismatch of observer gain in different speed ranges, a self-adaptive adjustment strategy of observer gain parameters is proposed, and the robustness of observer parameters is improved. on this basis, the synchronous reference frame filter is used to filter out the high-order harmonics of the observed back electromotive force, and the observation accuracy is further enhanced. Finally, the simulation results show that the proposed method has better observation performance and stronger robustness than the traditional method.