Effective Medium Transformation: the Case of Eddy Currents in Laminated Iron Cores

Markus Schobinger, Igor Tsukerman, Karl Hollaus
2021 IEEE transactions on magnetics  
Effective medium theory replaces a given fine-scale heterostructure with a homogeneous one in such a way that the physically measurable quantities, e.g. reaction fields and losses, remain approximately the same. This paper presents a peculiar case where the physical nature of the problem and the type of governing mathematical equations change upon homogenization. We consider a stratified nonlinear magnetic and conducting medium, where a low-frequency excitation induces eddy currents. It is
more » ... that this eddy current problem becomes, upone homogenization, mathematically equivalent to a magnetostatic one and takes eddy currents into account via a complex-valued nonlinear BH-curve. The homogenization procedure is demonstrated for a cylindrical laminated iron core. A high accuracy of homogenization, even for the local loss distribution, is demonstrated.
doi:10.1109/tmag.2021.3111478 fatcat:u6zwuuknbnagbobdlz777yn7mu