Design of Magnetic Shielding for Reduction of Magnetic Near Field from Wireless Power Transfer System for Electric Vehicle


The wireless power transfer (WPT) system for electric vehicle (EV) typically has a pair of two magnetically coupled coils with the relatively large air gap between them. The time-varying currents flowing through the coils produce the intense magnetic near field around the coils which is inevitable to transfer the high power wirelessly. In this paper, we investigate the design of the coils with magnetic shielding with the air gap of 200 mm via the finite element analysis tool to minimize the magnetic near field from the WPT system for EV. The simulation results show that the minimization of the magnetic near field from the coils can be achieved by making the average winding diameters and the diameter of the ferrite shields to be √2 and 3 times larger than the air gap length, respectively. For the case examined here, the magnitude of the magnetic near field is reduced over 29.12 % with the negligible loss of the power transfer efficiency.

Meeting Name

2014 International Symposium on Electromagnetic Compatibility, EMC Europe 2014 (2014: Sep. 1-4, Gothenburg, Sweden)


Electrical and Computer Engineering


This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MISP) (No. 2010-0028680 and No. 2010-0029179).

Keywords and Phrases

Electric Vehicle; Electromagnetic Field; Electromagnetic Shielding; Inductive Charger; Wireless Power Transfer

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International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2014 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

04 Sep 2014