Fault-tolerant method for six-phase PMSM by adjusting phase angle

Abstract

With the rapid development of electric vehicles, fault tolerance requirements of the motor used in electric vehicles become higher and higher. Multi-phase permanent magnet synchronous motors (PMSM) with their low torque ripple and high reliability and other advantages gradually become the main choice of electric vehicle drive motor. In this paper, taken six-phase double Y-shift 30° windings PMSM as the object, compared with the traditional three-phase PMSM, the performance after one phase open is analyzed, and then in order to decrease the torque ripple after one phase open, a fault-tolerant method of adjusting the phase angle of the left phase current is presented. The finite element simulation results show that when one phase open, compared with the three-phase PMSM, the output torque ripple of the six-phase PMSM is lower, and the presented fault-tolerant method can decrease the torque ripple further.