Abstract：To solve the problems of permanent magnet synchronous motor (PMSM) with big stator flux linkage and electromagnetic torque ripple and unsatisfying control performance in the traditional direct torque control (DTC) at low speed condition, a novel active disturbance rejection controller (ADRC) was proposed based on super-twisting sliding mode (STSM). The Bang-Bang control method of torque loop in the traditional DTC method was replaced by STSM control to reduce the problems of stator flux linkage and electromagnetic torque ripple caused by Bang-Bang control. ADRC was adopted to replace the PI controller for improving the effect of control system at low speed and solving the problem of speed overshoot, and the mathematical model of PMSM was provided. The designs of PMSM speed control based on DTC were completed with the design of torque and flux controller based on STSM and the design of active disturbance rejection speed controller. The effectiveness and the superiority of the proposed speed control method were verified by the simulation with Matlab/Simulink. The results show that under the same conditions, the proposed speed control system has no overshoot, and the rapidity and the anti-disturbance ability of the system are improved by nearly 70% in contrast to traditional system. The torque ripple is approximately reduced by 0.8 N·m， and the stator flux ripple can also be effectively suppressed.
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2022, Vol. 43 
