Interpretation of Loss Separation with the Haller-Kramer Model

Abstract

The Haller-Kramer model for domain structure is reviewed in detail. Magnetic domains and domain walls can be interpreted as the Prigogine dissipative structures. As consequence, processes of reversal of magnetization in a hysteresis cycle can be modeled with the minimum energy production principle. The Haller-Kramer model gives physical basis for the loss separation procedure.

An Improved Approach to Calculate Eddy Current Loss in Soft Magnetic Materials Based on Measured Hysteresis Loops

“…Calculate the interpolation factor using Equation (19); 2g. Calculate a, b and the time displacement using Equation (17).…”

“…Among them, the most striking is using constant value for magnetic permeability in the eddy current loss, i.e., neglecting not only the magnetic hysteresis, but also the nonlinearity of magnetic material. Moreover, Bertotti uses the low frequency approximations for the hysteresis and eddy current loss, i.e., the excess loss is determined without the skin effect taken into account [14][15][16][17], which may lead to significant errors for higher frequency or thicker electric sheets. Therefore, it seems reasonable to verify how these simplifications affect the classical eddy current loss, and, thus, the excess loss [18].…”