基于变系数滑模观测器的PMSM伺服系统

Permanent Magnet Synchronous Motor Servo System Based on Variable Gain Sliding-mode Observer

为改善永磁同步电机(PMSM)伺服系统的控制性能,在分析PMSM数学模型的基础上,提出了基于变系数滑模观测器的无位置传感器PMSM伺服系统控制方案。设计了滑模观测器,通过加入低通滤波器(LPF),协调LPF和滑模观测器的参数,改善了滑模观测器带来的抖动干扰。利用磁场定向控制原理,根据估算参数,实现了无位置传感器的PMSM矢量控制。样机实验结果表明,所提出的控制方案提高了系统的鲁棒性和伺服性能。

In order to improve the control performance of permanent magnet synchronous motor（PMSM） servo system,on the basis of analyzing the mathematical model of PMSM,a sensorless control strategy of PMSM servo system based on variable gain sliding-mode observer is presented.To solve the chattering problem of sliding-mode observer,the integrator is replaced by low pass filter（LPF）,and the coefficient of LPF is correspond with sliding-mode observer.Vector control of position sensorless PMSM is constructed based on field oriented control theory and parameters estimated by slidingmode observer.Experimental results show that the proposed strategy has stronger robustness and control performance.