Refined Disturbance Rejection for Permanent Magnet Synchronous Motors with Multi-Source Disturbances Using Equivalent Input Disturbance Approach

This paper presents a control strategy to reject disturbances for a permanent magnet synchronous motor (PMSM) system based on the equivalent-input-disturbance (EID) approach. Two EID estimators are devised to handle disturbances imposed on a current loop: one is used to estimate low-frequency components of disturbances, while the other is employed to estimate medium- and high-frequency components of disturbances. Another EID estimator is developed to estimate disturbances imposed on a speed loop of the motor. The estimates of disturbances are used for compensation on the control input channel of the current loop and the speed loop. It shows that disturbances are estimated separately and suppressed effectively for both loops. Simulation results demonstrate the validity and the superiority of the method.