Fractional-order Control of PMSM Servo System with Disturbances and Demagnetization Fault

Abstract

This paper focuses on the position and velocity tracking control of permanent magnetic synchronous motor (PMSM) servo system with considering the torque ripple, friction, load disturbance and unknown external interference as well as demagnetization fault. Based on the theory of fractional calculus, a set of fractional-order control methods of the position-velocity loop and current loop are established to improve the tracking control performance of PMSM servo system. It should be pointed out that the developed methods are independent of the system parameters and able to deal with uncertainties and nonlinearities of the system as well as demagnetization fault without any "trail and error" process. The effectiveness and superiority of the proposed control methods are verified by theoretical analysis and the MATLAB-ADAMS co-simulation studies, as well as the contrasts with PI methods.