Continuous model of magnetic material degradation due to cutting effects in the numerical simulation of electro laminations

Abstract:
Different processing steps during the production of electrical machines, such as shear cutting and punching, adversely affect magnetic material properties. Therefore, a decreasing local permeability along with rising hysteresis losses in the vicinity of cut surfaces can be observed. Geometrically small machine topologies show significant overlap of magnetically damaged areas. Current approaches in numerical simulations consider permeability deteriorations by subdividing the iron parts of finite element (FE) machine models into slices of different material properties [1]. Using this approach a continuous material description across the slices is not possible. A complicated and effortful model arises. In contrast this paper presents a continuous model to reflect local magnetic material properties in FE-simulations. Therefore a cristallographic approach is chosen. As a result, improved field and loss calculations are achieved.