Abstract
Three method of estimating the eddy current loss in ferromagnetic materials are evaluated. The comparison is undertaken for the simple one dimensional case of a conducting cylinder in a uniform, axially directed, time harmonic field. Three material types, ranging from cast iron to hot rolled steel, are considered at excitation levels of up to 120 kA/m and frequencies of 60, 400 and 1000 Hz. It is shown that despite the occurrence of highly distorted flux density and current density waveforms, a simple time harmonic solution to the eddy current problem provides a very cost effective and reliable estimate of the total and distributed losses. The time harmonic losses are compared with estimates provided by a separating surface model and by a time domain solution for the distorted waveforms.
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