Generalisation of the dynamic Preisach model toward grain oriented Fe-Si alloys

A generalisation of the dynamic Preisach model is proposed, for which the m agnetisation rate d phi/dt for each Preisach dipole is proportional to the difference between the effective field and alpha + k(n)phi or beta + k(n)ph i, where k(n) is an extra material parameter. With this modification, the a rea enclosed by the macroscopic hysteresis loops for a sinusoidal flux, bec omes dependent on the magnetisation frequency f according to the law root 1 + Cf - 1. The model has been compared with experimental results on grain o riented Si-Fe alloys and the correlation with the statistical loss theory i s shown. (C) 2000 Elsevier Science B.V. All rights reserved.