Physical Cauer circuits in nonlinear eddy-current modeling

The paper re-examines the use of physical Cauer circuits (CCs) for modeling magnetization processes in a ferromagnetic lamination and in a hollow thick-wall cylinder taking into account magnetic nonlinearity of their materials. The saturation is shown to be the main reason for the absence of conventional skin effect inherited from the linear eddy-current theory. It is shown that flux densities in the outer and inner layers of a lamination become comparable in magnitude when the material is operated at moderate and high average flux densities. In this typical case and contrary to common practice, there is no need to use CCs with non-uniformly discretized sections. It is shown that simple uniform CCs can be more accurate than circuits obtained using non-uniform discretization.