Control of PMSM based on reducedorder disturbance observer

ZHANG Wei，WANG Weiying
(School of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at reducing effect of load torque disturbance to the motor speed, a novel control method for permanent magnetic synchronous motor(PMSM) with reduced order antidisturbance observer was proposed. Reduced order antidisturbance observer was designed to estimate the disturbance torque. The observed value was used as feed forward compensation to the current loop to improve the robustness of the system.Considering of the effect of the motor inertia parameter to the antidisturbance observer, gradient correction parameter algorithm was introduced to estimate the inertia. Then, the estimation of the torque observer was compensated to the qaxis current to improve the dynamic response of the speed. The accuracy of the inertia estimation and the rationality of the reduced order antidisturbance observer design were verified by the simulation result.The results indicate that the robustness of the system can be improved　by vector control with the compensation of the estimation of the reducedorder disturbance observer.
Key words: reducedorder observer; permanent magnetic synchronous motor(PMSM); parameter identification