轴向磁场电机永磁体空载涡流损耗减小方法对比研究

减少轴向磁场电机永磁体空载涡流损耗的方法主要有：减小定子槽开口宽度、增大气隙长度、永磁体分块、使用屏蔽层和磁性槽楔等。基于轴向磁场电机的简化二维分析模型，分析了减小定子槽开口宽度和增大气隙长度、使用屏蔽层和磁性槽楔降低空载涡流损耗的效果。通过三维电磁场仿真，研究了永磁体不同分块方式对减少空载涡流损耗的效果。研究结果表明，减小定子槽开口宽度的效果最佳；虽然增加气隙长度可以显著减小涡流损耗，但永磁体用量迅速增加；永磁体分块减小涡流效果较好，且周向分块方式最好；屏蔽层起反作用；使用分段磁性槽楔效果比减小定子槽开口宽度稍微差一点，但加工难度要低些。

Comparative Study on Methods for Reducing No-Load Eddy Current Losses of Permanent Magnets in Axial Magnetic Field Motors

The main methods to reduce the no-load eddy current loss of permanent magnets of axial magnetic field motors include: reducing the width of the stator slot opening, increasing the length of the air gap, dividing the permanent magnet into blocks, using shielding layers and magnetic slot wedges, etc. Based on a simplified 2D analysis model of a permanent magnet axial field motor, the effects of reducing stator slot opening width and increasing air gap length, using shielding layers and magnetic slot wedges to reduce no-load eddy current losses are analyzed. The effects of different segmentation methods of permanent magnets on reducing no load eddy current losses are studied through three-dimensional electromagnetic field simulation. The research results indicate that reducing the width of the stator slot opening has the best effect; although increasing the length of the air gap can significantly reduce eddy current losses, the amount of permanent magnets used increases rapidly; the segmented permanent magnet has a better effect on reducing eddy currents, and the circumferential segmentation method is the best; the shielding layer has a counterproductive effect; the effect of using segmented magnetic slot wedges is slightly worse than reducing the width of stator slot openings, but the processing technology difficulty is lower.