Power efficiency of eddy current shielding of structural steel in transverse magnetic field

Author

Namjoshi, K.V. ; Biringer, P.P.

Author_Institution

Dept. of Electr. Eng., Toronto Univ., Ont., Canada

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2829

Lastpage

2831

Abstract

The authors analyze the power efficiency of eddy current shielding of structural members from the field produced by nearby cables. A two-dimensional geometry is used for illustration. Power loss in the structure, in the absence of the shield, is compared with the aggregate power loss in the structure and in the shield when the shield is present. Results show that eddy current shielding is power efficient only when the dimension of the shield is smaller than a certain characteristic length. A criterion is proposed to assist the estimation of this characteristic length. It depends on the dimensions, the magnetic permeability, the conductivity of the structure to be shielded, and the operating frequency. In the case of nonmagnetic conductors, the effect of an eddy current shield is to reduce the power loss in the object. The aggregate power loss does not, however, decrease

Keywords

eddy currents; magnetic permeability; magnetic shielding; aggregate power loss; characteristic length; conductivity; eddy current shielding; magnetic permeability; nonmagnetic conductors; operating frequency; power efficiency; structural members; structural steel; transverse magnetic field; two-dimensional geometry; Aggregates; Cables; Conducting materials; Conductors; Eddy currents; Geometry; Magnetic analysis; Magnetic shielding; Permeability; Steel;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179641

Filename

179641