轴向磁场电机永磁体空载涡流损耗减小方法对比研究

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

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。

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.