Electromagnetic Modeling of Ferrites Using Shell Elements and Random Grain Structures
Research output: Contribution to journal › Article › Scientific › peer-review
|Article number||7507204 |
|Journal||IEEE Transactions on Magnetics|
|Publication status||Published - 16 Jan 2020|
|Publication type||A1 Journal article-refereed|
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.