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Numerical characterization of the magnetic field in electric vehicles equipped with a WPT system

Part of: Contactless Charging for Electric Vehicles

Published online by Cambridge University Press:  14 June 2017

Tommaso Campi ,
Silvano Cruciani ,
Valerio De Santis ,
Francesca Maradei  and
Mauro Feliziani
Tommaso Campi*
Affiliation:
Department of Industrial and Information Eng. and Economics, University of L'Aquila, L'Aquila, Italy
Silvano Cruciani
Affiliation:
Department of Industrial and Information Eng. and Economics, University of L'Aquila, L'Aquila, Italy
Valerio De Santis
Affiliation:
Department of Industrial and Information Eng. and Economics, University of L'Aquila, L'Aquila, Italy
Francesca Maradei
Affiliation:
Department of Astronautics, Electrical and Energetic Eng., Sapienza University of Rome, Rome, Italy
Mauro Feliziani
Affiliation:
Department of Industrial and Information Eng. and Economics, University of L'Aquila, L'Aquila, Italy
*
Corresponding author: T. Campi Email: [email protected]
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Abstract

This paper deals with the numerical evaluation of the magnetic field emitted by a wireless power system (WPT) in an electric vehicle (EV). The numerical investigation is carried out using a finite element method (FEM) code with a transition boundary condition (TBC) to model conductive materials. First, the TBC has been validated by comparison with the exact solution in simple computational domains with conductive panels at frequencies used in WPT automotive. Then, the FEM with TBC has been used to predict the field in an electric car assuming the chassis made by three different materials: steel, aluminum, and fiber composite. The magnetic field source is given by a WPT system with 7.7 kW power level operating at frequencies of 85 or 150 kHz. The calculated magnetic field has been compared with the International Commission on Non-Ionizing Radiation Protection (ICNIRP) reference level demonstrating compliance for an EV with metallic (steel or aluminum) chassis. On the contrary, a fiber composite chassis is much more penetrable by magnetic fields and the reference level is exceeded.

Keywords

Wireless power transferElectric vehicleMagnetic fieldsEMF safetyShieldingThin layer modeling
Type
Special Issue on Contactless Charging for Electric Vehicles
Information
Wireless Power Transfer , Volume 4 , Special Issue 2: Contactless Charging for Electric Vehicles , September 2017 , pp. 78 - 87
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Copyright
Copyright © Cambridge University Press 2017 

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