外施励磁场作用下电工钢片的趋肤效应和涡流损耗（英文）

Skin effect and eddy current loss in electrical steel sheets under applied excitation fields

通过应用电磁扩散方程分析了基于麦克斯韦电磁场理论的交变激励条件下电工钢片的趋肤效应。考虑到在高频下趋肤效应更为明显,提出对扩散方程的无量纲化处理,并在考虑和不考虑趋肤效应两情况下计算涡流损耗。同时,利用三维磁性测试系统得到一种典型电工钢的宽带磁损耗和分离,来分析旋转激励下它的趋肤效应。提出了磁本构方程的简化,并将其引入扩散方程,采用有限元耦合弗雷德霍姆方程求解,最终写出具有趋肤效应的旋转涡流损耗分量的近似表达式。

By applying electromagnetic diffusion equation,skin effect in electrical steel sheets in the condition of alternating excitation is analyzed based on Maxwell electromagnetic field theory in this paper.Due to skin effect is more significant mainly at high frequency,nondimensionalized treatment for the diffusion equation is produced and eddy current loss is calculated by considering and not considering skin effect,respectively.Meanwhile,broadband magnetic losses and separation of a kind of typical electrical steel are obtained by using a 3D magnetic properties testing system to bring to light the emergence of skin effect under rotational excitation.The simplification of magnetic constitutive equation is proposed and introduced into the diffusion equation,which is solved by employing finite elements coupled to Fredholm’s equation.An approximate expression for the rotational eddy current loss component with skin effect is eventually written.