基于改进滑模观测器的PMSM无位置传感器控制

Sensorless Control of PMSM Based on Improved Sliding Mode Observer

在传统的滑模观测器(SMO)中,反电动势观测值的低通滤波及相位补偿环节会降低转速观测的精确度和动态响应速度。针对该问题,构建反电动势观测器用于分离反电动势信号,不再需要进行低通滤波和转子角度补偿,减小了SMO的抖振现象并且提高了观测器的精度。在此基础上,采用锁相环(PLL)替代反正切函数,估算转子转速和位置,并且采用Lyapunov函数证明了算法的稳定性。实验结果验证了改进SMO的可行性,与传统SMO相比,有效地抑制了抖振现象,提高了观测精度。

In the traditional sliding mode observer(SMO),the low-pass filtering and phase compensation link of the back electromotive force observation will reduce the accuracy and dynamic response speed of the speed observation.A back electromotive force observer is constructed to separate the back electromotive force signals.In this way,the lowpass filtering and rotor position compensation are no longer needed,which reduces the chattering phenomenon of the SMO and improves the accuracy of the observer.On this basis,the phase locked loop(PLL) is used instead of the arctangent function to estimate the rotor position and speed,the stability of the algorithm is proved by using Lyapunov function.The experimental results verify the feasibility of the improved SMO,compared with the traditional SMO,the chattering phenomenon is effectively suppressed and the observation accuracy is improved.