Eddy current losses in ferromagnetic laminations
- Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742 (United States)
- Department of Electrical Engineering, University of Naples ''Federico II'', I-80152 Napoli, (Italy)
- IEN Galileo Ferraris, Corso M. d'Azeglio 41, I-10125 Torino, (Italy)
It is demonstrated through the comparison of analytical, numerical, and experimental results that the existence of excess eddy current losses can be explained by the peculiar nature of the nonlinear diffusion of electromagnetic fields in magnetically nonlinear laminations. The essence of this peculiar nature is that nonlinear diffusion occurs as inward progress of almost rectangular profiles of magnetic flux density of variable height. Approximating actual profiles of magnetic flux density by rectangular ones, the problem of nonlinear diffusion can be treated analytically by using a simple model. The accuracy and the limit of applicability of the rectangular profile model are discussed by comparing its predictions with finite elements numerical solutions of nonlinear diffusion equation as well as with experimental results. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20216287
- Journal Information:
- Journal of Applied Physics, Vol. 87, Issue 9; Other Information: PBD: 1 May 2000; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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