Permanent magnet shape optimization method for PMSM air gap flux density harmonics reduction

This paper proposed a permanent magnet optimization method to suppress the air gap flux density harmonic of synchronous motor (PMSM). The corrected effective length motor, calculated magnetization in case parallel magnetization, and took influence relative permeability into consideration. Based on these works, for given sinusoidal waveform, corresponding structural parameters can be calculated, so as achieve magnet. By using this optimize shape magnet, fundamental wave retained greatest extent, eliminate harmonics maintain output capacity at same time. feasibility accuracy have been verified by finite element analysis (FEA) prototype machine experiment. is simple time-saving, has satisfactory accuracy, which provides reference PMSM.