Prediction of the shielding effectiveness at low frequency in near magnetic field

¹ IRSEEM-ESIGELEC, Avenue Galilée, 76801 Saint-Etienne-du-Rouvray, France
² SUPELEC, Département Energie, Plateau de Moulon, 3 rue Joliot Curie, 91192 Gif-sur-Yvette Cedex, France
³ VALEO-GEEDS, 2 rue André Boulle, 94046 Créteil, France
⁴ LGEP, UMR 8507 CNRS, SUPELEC, Université Paris-Sud, Université Pierre et Marie Curie, Plateau de Moulon, 11 rue Joliot Curie, 91192 Gif-sur-Yvette Cedex, France

^a e-mail: amin.frikha@esigelec.fr

Received: 24 October 2013
Revised: 17 February 2014
Accepted: 21 March 2014
Published online: 24 April 2014

Abstract

Equipment used in hybrid or electric vehicles (HEVs) must meet certain requirements. Beyond issues of electro-magnetic compatibility (EMC), it’s necessary to assess the risks related to the exposure of the passengers to electromagnetic field inside an HEV. At low frequencies, using the electromagnetic shielding as protection is inefficient. The compliance can be achieved done by defining the harness’s architecture or by the use of permeable materials. In this paper, we will focus on the prediction of the shielding effectiveness of materials subjected to a near magnetic field source at low frequency (9 kHz–10 MHz).We will focus our study on two cases. In the first case, we will work on the numerical modeling of an enclosure with and without opening. The result from the model is compared to the measurement’s results obtained with a test bench developed in our laboratory. In the second case, the impact of the slot in the enclosure will be studied. An analytical method based on magnetic moments approximation is developed to predict the shielding effectiveness for infinite plane with slot. The results obtained with the latter are compared with the numerical results.