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Electromagnetic Modeling of Ferrites Using Shell Elements and Random Grain Structures

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Original languageEnglish
Article number7507204
JournalIEEE Transactions on Magnetics
Volume56
Issue number2
DOIs
Publication statusPublished - 16 Jan 2020
Publication typeA1 Journal article-refereed

Abstract

We present a novel approach for stochastic finite element (FE) modeling of electromagnetic fields in ferrites, combining a thin shell model (TSM) for highly permittive grain boundaries with a Voronoi-tessellation-based geometry generation algorithm. The TSM is validated in the case of a periodic grain structure in a linear 2-D time-harmonic case over a frequency range of 10 kHz – 1 GHz, and problems related to standard FE discretization are discussed. The TSM is then applied in a stochastic study for simulating the effect of varying grain structure on the effective resistivity, losses and reactive power densities of a ferrite core.

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