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Switched reluctance motor (SRM) performance prediction requires the modeling of iron losses. The iron loss model in this paper separates the iron losses into two components, eddy-current and hysteresis losses, and models the losses as a function of the derivative of flux density. The model is suitable for the nonsinusoidal flux densities in the SRM and predicts the iron losses as a function of time. The model is general and can be applied to any electromagnetic device with known geometry and material property. The equations of iron loss are verified and validated through experiments with two simple geometries (a transformer and a toroid) and two SRMs.