Effect of saturation on iron loss in PMSM

In order to improve the efficiency of permanent magnet synchronous motor (PMSM) during all operation load conditions, this paper analyzes the iron loss in stator core taking into account magnetic saturation. Firstly, the flux density waveforms at five different positions of stator core have been studied respectively by finite element analysis (FEA) when the motor are operated in different loads. Fast Fourier transforms (FFT) of the flux density waveforms gives the explanation for the changes of the waveforms. Then the losses of five different parts are predicted through FEA, which are consistent with the rate of changes of the flux density seriously. In the end, the conclusion is given that the degree of saturation affects the iron loss in the stator core obviously.