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COMPARING OF APPROXIMATIONS OF MAGNETIZATION CURVES FOR NUMERICAL MODELING OF EDDY CURRENTS FIELDS

Alexey Glebov

Abstract

The modeling of eddy currents in ferromagnetic materials is impossible without information about magnetic field induction dependence of it intensity (magnetization curve). Experimental definition of magnetization curves related to technical difficulties. As a rule, reference information of that curves contains a small amount of knowledge and not applicable for direct application. In this regard the transition from original magnetization curve to its approximation is relevant. The purpose of a research is in the choice of optimal approximation way from the calculation of eddy currents point of view. Three different types of magnetization curves approximations are considering in article: Frolich, Melgui and universal Pentegov approximations. Comparing of approximations was conducted on the base of a standard deviation from original magnetization curve criteria, difference of magnetic coenegies criterion and calculation of active power error. The experimental data of magnetization of materials with different properties was used for comparative analysis. It is shown that the minimum error in calculation of eddy currents is provided by universal approximation. A replacement of magnetization curve by other approximations can lead to increasing of active power error up to 15%. The obtained results can be used for non-stationary electromagnetic analysis of complex technical systems for calculation of heat dissipation from eddy currents in ferromagnetic materials.

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