关键词: 永磁同步电机, 六相电机, 有限元分析, 容错

Abstract:

Traditional three-phase permanent magnet synchronous motors are unable to operate normally under the fault.Aiming at the failure, a multiphase permanent magnet synchronous fault tolerant motor which is suitable for electric vehicle was proposed,and the fault-tolerant control strategy was also analyzed. According to the motor performance index, parameters such as the size, permanent magnet, windings and so on were designed. The simulation model was established and analyzed in Maxwell finite element software. Using H bridge topological circuit, when the motor winding or inverter has short circuit or open circuit fault,the switch on the bus was directly cut off by detecting the change of current, so that all faults were converted to motor phase fault.The simulation results show that when the phase failure occurs, the motor torque ripple increases, and the output torque is reduced. After adopting fault-tolerant control strategy, the output torque was slightly reduced and the torque ripple was significantly reduced, thus verifying the feasibility of fault-tolerant control strategy and the rationality of the designed motor.

Key words: permanent magnet synchronous motor, six-phase motor, finite element analysis, fault-tolerant