Abstract:In this paper

to solve the higher distortion factor of permanent magnet synchronous generator (PMSG)

we discuss the reasons that result in the higher distortion factor and put forward tow methods

including using the non-uniformity air-gap and skew slot of stator. To obtain corresponding conclusions

the no-loading EMF and the air gap flux density and cogging torque， which are respectively in the case of non-uniformity air-gap and uniform air-gap

are compared by the way of finite element; in the same time

put forward a 2D segmentation method to solve the 3D issue. Simultaneously

it is worked out that the different skewed slots have a suppression effect on the tooth harmonic. Also

the cogging torque waveform and amplitude table

as well as the waveform of the no-loading EMF in different skewed slots are obtained. According to these

the best stator chute is got. After taking the non-uniformity air-gap and skew slot of stator， the voltage distortion rate is reduced from 7.32% to 4.8%

which meets the design requirements.