Vector Preisach modeling of magnetic materials under stress

6th International Workshop on Multi-Rate Processes and Hysteresis

Ktena, A.^1

Department of Electrical Engineering, TEI of Chalkida, Psahna, Evia

34400, Greece^1

关键词: Angular dispersions;    Anisotropy dispersion;    Compressive residual stress;    Demagnetizing field;    Differential permeability;    Probability density function (pdf);    Relative distances;    Vector Preisach model;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/585/1/012001/pdf
DOI  :  10.1088/1742-6596/585/1/012001

来源: IOP

【 摘 要 】

The Preisach formalism is used to model magnetic hysteresis loops in soft magnetic materials subject to tensile stress. The model uses the Stoner-Wohlfarth mechanism of coherent rotation and dispersion of easy axes to capture the vector response of the magnetization. The Preisach density is constructed as the weighed sum of normal probability density functions (pdf) for the regions of high and low induction. The model parameters reflect the effect of strain: increased pinning, modelled by the central pdf parameters; enhanced anisotropy dispersion modelled by the angular dispersion of easy axes. Upon removal of the tensile stress, compressive residual stresses give rise to effective demagnetizing fields leading to lower differential permeability with a two-peak profile. As deformation levels increase, the amplitude of and the relative distance between the two permeability peaks changes which is reflected in the side density parameters. Modelling results are in qualitative agreement with the experimental data. The potential and limitations of the model are discussed.