Finite-element modelling of a composite structure made of ferromagnetic grains embedded in a non-magnetic matrix. The air gaps between the “particles” dictate the effective permeability and allow energy storage in magnetic field. The black lines are illustrating the distribution of magnetic flux within the volume of such core. The grey scale shows the resulting flux density (darker colour means higher value).
This FEM simulation was deliberately made with arbitrary size and spacing of the “particles” to better illustrate the distribution of magnetic field lines on qualitative level. Therefore, it is not representative of real powder cores, in which the particles usually are packed with less space between them, with distorted shapes of particles, etc.
 The results were generated with the software Finite Element Method Magnetics created by Dr David Meeker. |
fem_of_powder_core_magnetica.png
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S. Zurek, Encyclopedia Magnetica, CC-BY-4.0
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