基于ekf和smc的永磁同步电机无传感器矢量控制-信息与控制.pdf

41 2 Vol.41, No.2 2012 04 Information and Control Apr., 2012 DOI 10.3724SP.J.1219.2012.00267 EKF SMC 241000 EKF PMSM PI proportional-integral TM351 A 1002-0411(2012)-02-0267-06 Sensorless Vector Control of Permanent Magnet Synchronous Motors Based on EKF and SMC XUE Shugong WEI Lisheng LING Youzhu (Anhui Provincial Key Laboratory of Electric and Control , Electrical Engineering College, Anhui Polytechnic University , Wuhu 241000, China) Abstract: The rotor speed and the position of a permanent magnet synchronous motor (PMSM) are estimated for building sensorless vector control system with speed and current double closed loops based on an extended Kalman filter (EKF) algorithm. To solve the problems of the biased estimation and the lack of robustness against the errors of the model in the EKF, a sliding mode speed controller is proposed based on the exponent reaching law. To improve the capacity of anti-load- torque-disturbance of speed loop, a load torque observer is designed and the result of observation is imported into the input of current controller functioning as the controlling input of the feed-forward compensation. The simulation results show that the proposed control strategy is superior to conventional PI (proportional-integral) speed controller for its smaller speed tracking errors, faster response, no overshoot, stronger ability of anti-load-torque-disturbance, etc. Keywords: permanent magnet synchronous motor; extended Kalman filter; sliding m