Computation of high-frequency TM eddy-current losses in magnetic materials

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Abstract
The paper deals with the computation of eddy‐current losses in linear magnetic materials due to time‐harmonic transverse magnetic fields. The variations of the losses in magnetic cylinders with circular and rectangular cross sections are examined over the whole frequency range. The results are generated analytically or by a boundary‐elements analysis. Four distinct ranges are identified. It is shown that over a wide frequency range an impedance boundary condition (impedance BC) prevails at the boundary. The magnetic field however is still strongly influenced by the demagnetizing fields. In this range the losses can be approximately evaluated by solving one singular boundary integral equation.