三相永磁同步电机断相容错控制

To improve the reliability of three-phase permanent magnet synchronous motor (PMSM) control system and reduce the ripple of output torque in case of the stator windings occur open-circuit, a fault-tolerant control strategy for three-phase PMSM was proposed. Based on the relationship of current and voltage of non-fault phase, a mathematical model of the three-phase PMSM with one phase open-circuit was established. According to the analysis of the output torque under healthy and fault state, a fault-tolerant control strategy with output torque invariant was proposed. By redistributing the magnitude and phase of the non-fault phase current, the feed forward zero axis voltage was calculated to ensure the normal operation of the drive system. In order to improve the stability of output torque under phase open-fault, A combination control strategy of the feed forward zero axis voltage and closed loop correction of central current was proposed, which realized no-disturbed operation. By adopting rotor field oriented method, adding the feed forward zero axis voltage and closed loop correction of central current controller to dq current controller, the output torque was compensated. The experimental results show that the method is correct and effective to improve the reliability of the drive system.