Novel highorder sliding mode speed observer for permanent magnet synchronous motor
JI Kehui1,2, ZHOU Yong2, LU Wenqi1
（1.Faculty of Mechanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China; 2.Zhejiang Huafeng Electric Tools Co., Ltd, Jinhua 321037, China; 3.Rojek(Ningbo)Intelligent Technology Co., Ltd, Ningbo 315000, China）
 

Abstract: Aiming at solving the speed detection delay and low precision of the sensorless control system of surface mounted permanent magnet synchronous motor(PMSM), a highorder sliding mode observer was considered for rotor position and speed estimations of a PMSM. The PMSM sensorless speed control system model and the traditional sliding mode speed observer were analyzed. According to the mathematical model of the PMSM and the highorder sliding mode algorithm theory, a novel speed observer was proposed. The vector control system of PMSM based on the new sliding mode speed observer was built by using simulink software and the starting characteristic, the speed tracking performance and the antidisturbance performance were studied. The results indicate that the filtering effect on the speed could be completely avoided and the speed detection accuracy is increased, so the steady state and dynamic performance of control system and robustness is improved.
Key words: highorder sliding mode; PMSM; sensorless control; speed observer