Comparison of Dynamic Loss Inclusion Under Asymmetrical Minor Loops Using Lavers Formula and Inverse Jiles-Atherton Model

Predicting core loss and dynamic magnetization of soft magnetic materials for arbitrary excitations is crucial under high harmonic content. The dynamic losses for nonsinusoidal excitation evaluated using the Lavers' formula and inverse Jiles-Atherton (JA) model are compared. The modeling of hysteresis curves with minor loops using the JA model is achieved by predicting three components of the magnetic field strength based on the field separation approach. The flux variation due to minor loops is considered by following the magnetic flux density in time using eddy current and excess field terms. The dynamic extension of the JA model to represent asymmetrical minor loops using the field separation approach is presented. The proposed method seems promising for use in finite element method (FEM) simulations for predicting iron losses in electromagnetic design problems involving power electronic converters.