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3-D eddy current and fringing-flux distribution in an axial-flux permanent-magnet synchronous machine with stator in laminated iron or SMC

机译：定子铁芯或SMC轴流永磁同步电机的3-D涡流和磁通分布

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摘要

This paper compares the iron losses generated by the concentrated excitation windings of an axial-flux permanent-magnet synchronous machine (AFPMSM) in the stator core elements constructed with laminated silicon steel sheets (LSSS) or with soft magnetic composite (SMC). As the flux mainly flows in one direction, we use grain-oriented LSSS. In order to provide a very accurate comparison, individual laminations are modeled in the 3-D finite-element model, including the coating layer. The model accounts for the magnetic stray field (fringing field) that causes eddy currents in the plane of the sheets, in addition to the main flux causing the classical eddy-current loss. The losses caused by the 3-D eddy-current pattern, as well as hysteresis and excess losses, are computed and measured for a test setup. A comparison of losses is made for the SMC mounted in the same setup. SMC does not suffer from eddy currents due to fringing flux. Although SMC has a 16 times higher loss than the LSSS at 1 T and 50 Hz as measured with an Epstein frame, it was shown that the iron losses in the SMC in the AFPMSM setup are only 1.5 times higher than for the LSSS.
机译：本文比较了由轴向磁通永磁同步电机（AFPMSM）的集中励磁绕组在叠片式硅钢片（LSSS）或软磁复合材料（SMC）构成的定子铁芯元件中产生的铁损。由于通量主要在一个方向上流动，因此我们使用了晶粒取向的LSSS。为了提供非常准确的比较，在3-D有限元模型中对各个叠层建模，包括涂层。除了引起经典涡流损耗的主要磁通量之外，该模型还考虑了在片材平面中引起涡流的磁杂散场（边缘场）。计算并测量由3-D涡流模式引起的损耗，以及磁滞和过大损耗，以进行测试设置。对安装在相同设置中的SMC的损耗进行比较。由于边缘磁通，SMC不会受到涡流的影响。尽管使用爱泼斯坦镜架测量，SMC在1 T和50 Hz时的损耗比LSSS高16倍，但事实证明，AFPMSM装置中SMC的铁损仅比LSSS高1.5倍。

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