凸形极靴表贴式永磁磁极同步电机性能优化

Performance Optimization of Synchronous Motor with Surface-mounted Permanent Magnet Poles and Convex Pole Shoes

针对表贴式永磁同步电机空载径向气隙磁密波形正弦性差导致电机反电势波形畸变,影响电机输出性能,改良的复杂结构的永磁钢导致加工成本提高的问题,提出一种表贴式矩形永磁钢加装凸形极靴的新型磁极结构。利用有限元软件建立3相18极54槽永磁同步电机,研究极靴参数对永磁同步电机空载径向气隙磁密、空载反电势、齿槽转矩和永磁钢涡流损耗的影响规律,获得最优极靴参数。输出特性对比分析可得,加装极靴的新型磁极电机空载反电势波形正弦性明显提高,齿槽转矩和永磁钢涡流损耗大幅度降低,电机输出性能显著改善。

Aiming at the poor sinusoidal no-load radial air-gap magnetic density waveform for affecting the distortion of back electromotive force and the output performance of the surface-mounted permanent magnet synchronous motor,and improving the processing costs of the permanent magnet steels with complex structures,a new magnetic pole structure with rectangular permanent magnet steel and convex pole shoe is proposed.The optimum parameters of the pole shoe are obtained by analyzing the influence of the pole shoe parameters on the no-load radial air-gap magnetic density,no-load back electromotive force,cogging torque and permanent magnet steel′s eddy current loss by using 3 phases,18 poles and 54 slot permanent magnet generator simulation model established via finite element simulation software.And the comparison results of output characteristics show that the new magnetic pole with convex pole shoe can make the sinusoidal performance of back electromotive force waveform obviously improved,cogging torque and permanent magnet steel′s eddy current loss greatly reduced,and motor output performance significantly improved.