Improved numerical modelling and characterization of ferromagnetic materials and their losses

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The accurate estimation of iron losses has become a prominent problem in electromagnetic design. Iron losses are calculated nowadays after considerable simplification. Ferromagnetic materials are assumed non-conductive and non-dissipative for the field computation, which represents a twist in the modelling. This project aims at filling this gap.It is intended to establish a scientific background for the analysis of iron losses in applications involving laminated ferromagnetic cores, providing designers with modelling tools to evaluate design measures for loss reduction and optimum material choice. These tools will also contribute to be on time with the upcoming EU regulations as regards the efficiency of electrical machines and ecodesign requirements.There exist so far no macroscopic material model considering simultaneously vector hysteresis, the laminated structure and the issue of parameter identification. A central feature in the proposed research is to establish a semi-physical model as an intermediate representation between measured data and macroscopic material characteristics. The semi-physical model contains as much as possible of the physics involved and has free parameters to be identified by measurements. The parameters of a semi-physical model are ex-pected to be more intrinsic and objective than those of empirical models, and hence better correlated with microstructure parameters, making it possible to interpret macroscopic simulation results in terms of micro-structure.