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The normalB-Hcurves of several types of steel are shown to be approximated by the equationH= (k₁ e^{k₂B²} + k₃) B. The reluctivity (H/B) and its derivative with respect toBare given by simple equations that are especially useful in the finite element method of analyzing steel magnetic circuits.
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J.R. Brauer (1975) studied this question.
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