According to the characteristics of multiphase motor, in order to facilitate the research of multiphase motor's fault-tolerant operation performance and fault-tolerant control strategy, based on MATLAB / Simulink, a simulation model of multiphase induction motor's fault-tolerant operation is proposed, which is fast in simulation and has little change before and after the fault of system model. The mathematical model of motor and the voltage of each phase winding after fault are reconstructed by adopting the method of no reduction of order Methods to simulate the motor phase failure, the current and torque characteristics of the multi-phase motor under different phase failure conditions are simulated, and the effectiveness of the proposed phase failure simulation model is verified by the finite element analysis software Ansoft simulation.<br>
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