Formula for Energy Loss in Soft Magnetic Materials and Scaling
K. Sokalski and J. Szczygłowski
Faculty of Electrical Engineering, Technical University of Częstochowa, al. Armii Krajowej 17, 42-200 Częstochowa, Poland
Received: July 17, 2008; Revised version: September 23, 2008; In final form: October 16, 2008
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Basing on scale invariance of considered system an improvement of the Bertotti formula for energy loss in soft magnetic materials has been achieved. Assumptions of the Bertotti theory were discussed and criticized. As an alternative to this theory a new approach basing on the scale invariance of complex systems has been presented. The generalized description of energy loss has been recently postulated by us in the form of the homogeneous function in a general sense which leads to a series expansion for the energy loss. On the basis of measurement data it has been proved that only two first terms of the series are relevant. New measurements of the energy loss in soft magnetic materials have been performed which confirms the scaling theory. The obtained formula enables very simple description of the energy loss in soft magnetic materials, taking into considerations wide ranges of frequency and magnetic induction. The revealed data collapse of energy loss enables comparison of energy losses data taken by different methods. This phenomenon also supplies new criterion for correctness of empirical data.
DOI: 10.12693/APhysPolA.115.920
PACS numbers: 75.50.-y, 89.75.Da