Numerical Approach for Computation of Electromagnetic Shielding

Disturbing magnetic field (so-called magnetic smog) can be in certain areas suppressed by shielding jacket. Disturbing field is possible to be “lead away” from the shielded area with the use of jacket made of materials with high magnetic permeability (so-called passive shielding, or flux-entrapment...

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Bibliographic Details
Published in:Journal of Electrical Engineering 2013-06, Vol.64 (4), p.256-260
Main Authors: Mayer, Daniel, Ulrych, Bohuš
Format: Article
Language:English
Subjects:
electromagnetic smog
magnetic field theory
magnetic shielding
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Summary:Disturbing magnetic field (so-called magnetic smog) can be in certain areas suppressed by shielding jacket. Disturbing field is possible to be “lead away” from the shielded area with the use of jacket made of materials with high magnetic permeability (so-called passive shielding, or flux-entrapment shielding). If the disturbing field is time-variable, eddy currents are induced into electrically conductive jacket. Magnetic field generated by these eddy currents suppress the disturbing field (this is called active shielding, or lossy magnetic shielding). Both of these principles can be applied altogether (this is called combined shielding). Presented paper states numerical approach to shielding jacket design and is an introduction to following solution of a real problem of magnetic shielding when the disturbing magnetic field is space-time complicated. Effective design of the magnetic shielding should then be formulated as an optimization task.
ISSN:1335-3632
1339-309X
DOI:10.2478/jee-2013-0037