Kc. Lim et al., INTEGRAL LAW DESCRIPTIONS OF QUASI-STATIC MAGNETIC-FIELD SHIELDING BYTHIN CONDUCTING PLATES, IEEE transactions on power delivery, 12(4), 1997, pp. 1642-1650
A method is described for calculating the induced current distribution
within a thin, nonferrous conducting plate with finite dimensions in
the presence of an imposed magnetic field due to specified source cond
uctors, The induced current solution is used to evaluate the resultant
shielded magnetic field. In contrast with three-dimensional finite el
ement descriptions, the method is applicable and computationally effic
ient for the complicated imposed field distributions that are typicall
y present in practical shielding applications. Calculated results are
compared with measured results for an experimental setup in which sour
ce conductors carry time-varying currents in opposite directions on on
e side of an aluminum plate, with the field magnitudes determined on t
he opposite (shielded) side of the plate. The calculated and measured
results are in good agreement, both when the aluminum plate is present
and when it is absent. This good agreement extends to regions where e
nd effects yield very significant departure from the results of a 2-D
finite element eddy current simulation.