高频非晶合金轴向磁通永磁电机温度场计算

高频非晶合金轴向磁通永磁电机永磁体涡流损耗分布不均,所以在电机温度场计算时不能简单地给永磁体赋一个平均生热率,需要根据永磁体不同位置的涡流损耗密度赋相应的生热率。本文将永磁体分成多块,利用有限元分别计算每块永磁体上的涡流损耗大小,给出了永磁体的不同位置涡流损耗分布规律。根据涡流损耗分布规律,改进了的永磁体分块原则,提高了电机温升计算效率。最后,利用有限体积法对考虑涡流损耗分布和未考虑涡流损耗分布两种情况下电机的温升分别进行了计算,结果显示,考虑涡流损耗分布计算出的电机温升结果更接近实测值。

Temperature field calculation of high frequency amorphous alloy axial flux permanent machine

According to the non-uniform distribution problem of eddy current loss in permanent magnets of high fre-quency amorphous alloy axial flux permanent magnet machine, an average heat rate should not be entrusted to the permanent magnets during calculating the temperature, and according to the eddy current loss distribution in perma-nent magnets, the different heat rates should be entrusted to the different positions of permanent magnets. The eddy current losses of every permanent magnet blocks which were divided from a whole permanent magnet were calculat-ed by finite element method, and the eddy current loss distribution rule in different position of permanent magnets was presented. According to the eddy current loss distribution rule, the block principle of permanent magnet was improved, and then, the efficiency of temperature field calculation was increased. Finally, the temperatures of a machine were calculated considering and without considering the eddy current loss distribution. Calculation results show that the latter is closer to the test result.