Passive and active electromagnetic shielding of induction heaters

Author

Sergeant, Peter ; Adriano, Ugo ; Dupré, Luc ; Bottauscio, Oriano ; De Wulf, Marc ; Zucca, Mauro ; Melkebeek, Jan A A

Author_Institution

Dept. of Electr. Energy, Ghent Univ., Belgium

Volume

40

Issue

2

fYear

2004

fDate

3/1/2004 12:00:00 AM

Firstpage

675

Lastpage

678

Abstract

In induction heaters, a metallic workpiece is heated by eddy currents, induced by strong alternating magnetic fields. Using numerical models, proper active and passive shields are designed in order to mitigate the stray field of the induction heater. Two models are presented: an axisymmetric finite-element (FEM) and a hybrid finite-element-boundary-element (FEM-BEM) model. Results of both numerical methods are compared and verified with measurements on an induction heater archetype. A good correspondence is observed. Combination of passive and active shielding results in almost 20-dB field reduction.

Keywords

boundary-elements methods; eddy currents; electromagnetic shielding; finite element analysis; induction heating; magnetic fields; FEM model; FEM-BEM model; active shield; alternating magnetic fields; axisymmetric finite-element model; eddy currents; electromagnetic shielding; hybrid finite-element-boundary-element; induction heaters; magnetic field; metallic workpiece; passive shield; stray field; Coils; Eddy currents; Electromagnetic heating; Electromagnetic shielding; Finite element methods; Geometry; Magnetic field measurement; Magnetic materials; Magnetic shielding; Numerical models;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.824815

Filename

1284504