Research on fault-tolerant control method for demagnetization faults of permanent magnet synchronous motor

Aiming at the problem that the loss of magnetic field of permanent magnet synchronous motor causes the performance of motor with load to decline, a fault-tolerant control method based on adaptive observer flux linkage on-line detection is proposed. Firstly, according to the predictive control model of permanent magnet synchronous motor, the influence of loss of magnetic field on current control and motor running state is analyzed. Secondly, the adaptive observer is used to accurately observe the flux linkage, and then the observed value of the state current is obtained. Finally, the observed value of the state current is fed back to the controller so that the response current can accurately track the given current, thus realizing the stable operation of the motor. Simulation results show that the method is feasible.