Soft magnetic composites (SMCs) are composed of ferromagnetic particles surrounded by electrical insulation. To establish a homogenization technique for the magnetic field analysis of an electrical machine with an SMC core, we have already proposed a method to evaluate the effective permeability and iron loss of the SMC core using a cell model of one particle taking into account the nonlinear magnetic characteristics and eddy currents. However, the measured eddy current loss cannot be represented by using the proposed method. In this article, a 3-D eddy current analysis method modeling the anomalous eddy current loss due to the movement of domain walls in the cell model is developed based on the Pry and Bean magnetic domain model. The effect of the non-uniformity of the domain structure on the anomalous eddy current loss is investigated. It is shown that the measured eddy current loss can be almost represented by adding the anomalous eddy current loss to the classical one.

中文翻译：

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由于软磁复合材料颗粒中畴壁运动引起的异常涡流损耗的建模

软磁复合材料 (SMC) 由被电绝缘材料包围的铁磁颗粒组成。为了建立一种用于具有 SMC 磁芯的电机的磁场分析的均质化技术，我们已经提出了一种方法来评估 SMC 磁芯的有效磁导率和铁损，该方法使用一个粒子的单元模型并考虑非线性磁场特性和涡流。然而，所测得的涡流损耗不能用所提出的方法来表示。在本文中，基于 Pry 和 Bean 磁畴模型开发了一种 3-D 涡流分析方法，该方法对由于晶胞模型中畴壁移动引起的异常涡流损耗进行建模。研究了域结构的不均匀性对异常涡流损耗的影响。