交直流叠加磁化下恒导磁薄片的反常涡流损耗

本文利用一致畴转模型分析了在交直流叠加磁化下恒导磁薄片的低频涡流损耗。指出涡流损耗的反常不仅壁移,而且同样存在于畴转。其原因是畴转过程中畴内磁导率是张量,从而比经典模型增加了一项“侧向涡流”。导出了转动涡流损耗反常系数η_r的表达式;并将结果在某些应用领域中作了推广,得出了相应的结论。

ANOMALOUS EDDY CURRENT LOSSES OF ISOPERM THIN STRIPS UNDER SUPERPOSED MAGNETIZATION BY ALTERNATING AND DIRECT CURRENTS

The eddy current loss at low frequencies in thin strips of isoperm under superposed magnetization by alternating and direct currents has been analyzed with a model of coherent rotation in magnetic domains. It is considered that the eddy current loss anomaly is not only caused by the displacement of the domain walls, but also by the rotation of magnetization. As the magnetic permeability is a tensor in the rotation process, it gives rise to a "laterat eddy current" term in addition to that given by the classical theory. Thence an expression has been derived for the anomaly coefficient η_r of the eddy current loss due to rotation. The theory has been extended to certain applied fields, and corresponding conclusions have been obtained.