Eddy-current power loss in toroidal cores with rectangular cross section

In this paper, we investigate eddy-current power loss in toroidal cores with a rectangular cross section. An analytical method is used in which the field variables are expressed in terms of products of Bessel functions and trigonometric functions. A closed-form expression is derived for the power lo...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1998-05, Vol.34 (3), p.636-641
Main Authors: Namjoshi, K.V., Lavers, J.D., Biringer, P.P.
Format: Article
Language:English
Subjects:
Applied classical electromagnetism
Closed-form solution
Coils
Conductivity
Current density
Electromagnetism
electron and ion optics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Magnetic cores
Magnetostatics
magnetic shielding, magnetic induction, boundary-value problems
Permeability
Physics
Skin
Toroidal magnetic fields
Transformer cores
Wounds
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Summary:In this paper, we investigate eddy-current power loss in toroidal cores with a rectangular cross section. An analytical method is used in which the field variables are expressed in terms of products of Bessel functions and trigonometric functions. A closed-form expression is derived for the power loss. The influence of various parameters such as skin depth and core dimensions over a wide range is discussed. Simplified expressions for the power loss at special cases such as very small and very large skin depths are provided. A comparison with measured values is presented.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.668058