Open AccessThe loss of energy in metal plates of finite thickness, due to eddy currents produced by alternating magnetic fields
Publication year - 1926
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1926.0084
Subject(s) - eddy current , magnetic field , mechanics , thermal conduction , slab , condensed matter physics , metal , materials science , electromagnetic induction , alternating current , flow (mathematics) , physics , composite material , thermodynamics , geophysics , electromagnetic coil , metallurgy , power (physics) , quantum mechanics
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.