Modeling the Field Inside a Soft-Magnetic Boundary using Surface Charge Modeling

Recent advances have been made into modeling soft-magnetic materials using the surface charge model. Up till now, the model has only been used to model the field outside the soft-magnetic material. To include saturation in the future, the magnetic field inside the material should be known. In this paper the model is used to calculated the field inside the material when three different shapes of boundaries are considered. Comparing the results to FEM shows that the differences in the air region are smaller than 1 mT and in the soft-magnetic region smaller than 4 mT. Larger discrepancies can, however, occur near the corner of the material.