基于负载转矩滑模观测的永磁同步电机滑模控制

为了减小负载转矩扰动对永磁同步电机(permanentmagnet synchronous motor,PMSM)控制系统的影响,提高系统抗扰能力,提出一种以转速和负载转矩为观测对象的扩展滑模观测器,以实际转速与观测转速之差构成滑模面,负载转矩观测结果由负载转矩实际值和经过滤波后的抖振信号组成,当滑模运动发生后转矩观测误差渐进收敛到零。设计了基于指数趋近律的PMSM滑模控制(sliding-modevariable structure control,SMC)系统,将观测的负载转矩进行前馈补偿,以克服负载时变对控制性能的影响。实验结果表明,该观测器可准确地观测负载转矩,采用的前馈补偿方案对系统负载扰动有较强的鲁棒性,并且SMC固有抖振现象得到了有效抑制。

Sliding Mode Control of PMSM Based on a Novel Load Torque Sliding Mode Observer

An extended sliding-mode observer of the load torque was proposed,of which the state variables were speed and load torque,in order to decrease influence of varying load torque in a permanent magnet synchronous motor(PMSM) control system.Errors between the real and the observed speed were selected as a sliding-mode hyper plane,and the observed load torque was composed of a real load torque and the filtered chattering signal.The observation error converged to zero when sliding mode occurred.A sliding-mode variable structure control(SMC).system of PMSM was designed based on the exponent reaching law,in which the observed load torque was used for feed-forward compensation.Experimental results show that the novel sliding-mode observer can estimate the load torque precisely,and the designed controller can enhance system robustness and suppress the intrinsic chattering of SMC.