Modeling and Simulation of Nine-Phase Permanent Magnet Synchronous Motor

To study the operation characteristics of the nine-phase PMSM (Permanent Magnet Synchronous Motor), this paper derived the Clarke transformation matrix of the nine-phase PMSM with the winding 3Y shifted by 20° via analyzing the harmonic subspace of the multi-phase PMSM, and further obtained its mathematical model under the rotating coordinate system. Then, a nine-phase PMSM based on the proposed model was built in SIMULINK and the operation mode of starting, braking and phase missing is simulated. The simulation results show that the nine-phase PMSM has good dynamic performance and steady-state performance, which also verifies the correctness and rationality of the motor model.