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Finite-element eddy-current analysis is combined with the play model to represent the AC hysteretic properties of a silicon steel sheet. The dependence of the anomaly factor on the excitation frequency is discussed. The finite element analysis with a constant anomaly factor overestimates the iron loss relative to the result obtained from classical eddy-current theory because of the nonlinearity of magnetization. The nonuniform magnetic property along the thickness direction is examined, and a dynamic anomaly factor is then introduced to directly represent the frequency dependence. The alternating magnetic properties simulated by the proposed model agree well with measured properties.