The loss of energy in metal plates of finite thickness, due to eddy currents produced by alternating magnetic fields

The induction of eddy currents in metal plates which are subjected to alternating magnetic fields has been discussed by Clerk-Maxwell, J. J. Thomson and many others. When an alternating magnetic field is produced normal to the surface of a metal plate, eddy currents are induced at the surface of the...

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Bibliographic Details
Published in:Proceedings of the Royal Society of London. Series A, Containing papers of a mathematical and physical character Containing papers of a mathematical and physical character, 1926-07, Vol.111 (759), p.604-614
Main Authors: Marchant, E. W., Miller, J. L.
Format: Article
Language:English
Subjects:
Copper
Eddy currents
Electric current
Magnetic fields
Zinc
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Summary:The induction of eddy currents in metal plates which are subjected to alternating magnetic fields has been discussed by Clerk-Maxwell, J. J. Thomson and many others. When an alternating magnetic field is produced normal to the surface of a metal plate, eddy currents are induced at the surface of the plate, which gradually penetrate its interior, the current dying away as it penetrates more deeply into the metal. The diffusion of the currents into the plate depends upon the self-induction and resistance of the paths along which they flow, and can be calculated by the same kind of formula as is used for determining the conduction of heat through a metal slab.
ISSN:0950-1207
2053-9150
DOI:10.1098/rspa.1926.0084