NUMERICAL CHARACTERIZATION MODEL OF VECTOR HYSTERESIS FOR MAGNETIC MATERIALS
The paper presents a numerical method based on Preisach model for the characterization and modelling of hysteretic magnetic materials exhibiting vector hysteresis, with acceptable accuracy, based on minimal material measurement data. The identification approach based on the Everett distribution function is a way to obtain accurate numerical solutions when the experimental data of the magnetic material are scarce, for instance: there are known only the initial magnetization curve and the upward major branch for two directions (rolling and transverse ones). The comparison between the measured and simulated major loop curves for another magnetization direction shows good agreements.
Accurate analysis of magnetic devices with anisotropic vector hysteresis
Abstract This paper deals with the implementation of an anisotropic vector Preisach model, as proposed by Mayergoyz, and its insertion into a numerical magnetic field solver. A detailed description of the identification procedure of the model is presented. Results obtained on some materials where rotational measurements were available are reported. A good agreement is found between simulated and experimental results. Afterwards, the field formulation and the nonlinearity handling scheme of the finite element magnetic solver are outlined and an example on a test case is discussed.
Energy considerations in hysteresis models
The energy dissipated by a magnetic material is computed for both a single particle and an assembly of particles represented by a generalized Preisach model. For an isolated particle, the two components of the energy loss are due to sudden change in the irreversible magnetization and due to the change in the ability of the magnetization to store energy because of the change in state. The former loss is equal to the product of the permeability, the applied field, and the discontinuous magnetization change. It is noted that the size of the discontinuous change in magnetization is generally not equal to the difference of the two remanent magnetizations. These energy loss components carry over into the computation for an assembly of particles. >