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Paper Abstract and Keywords
Presentation 2014-06-06 18:00
Proposal of Theoretical Model for Foreign Object Detection in Wireless Power Transfer Systems
Atsuo Hatono (MJHEP Program) WPT2014-34
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a integrated theoretical model for foreign object detection (FOD) combined with both circuit and field level phenomena. If there be foreign object in the gap of wireless power transfer systems, the object will be heated with eddy currents caused through the interaction with electromagnetic fields. The phenomenon cannot be formulated with the equivalent circuit theory for circuit levels. For the integration of field and circuit level phenomena, this paper formulates FOD with Maxwell Equations which are the fundamental principle of electromagnetic phenomena. This model showed that thermal effect is theoretically proportional to permeability of the foreign object which dominates eddy currents. Strong thermal effects of aluminum foils and stainless scrubbing brush can be explained with their huge mutual inductance comparatively large surface area to their volumes. Further, it also showed that it is difficult to detect the foreign objects through the shift of the mutual impedance of WPT since the effects of FOD to the circuit level appears in the real part of the mutual impedance of WPT. It is desired to develop the FOD sensing circuits sensitive to inductive components of mutual impedance.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless Power Transfer Systems / FOD / Maxwell’s Equations / Eddy Current, / Mutual Impedance / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 72, WPT2014-34, pp. 57-62, June 2014.
Paper # WPT2014-34 
Date of Issue 2014-05-30 (WPT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Copyright
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee WPT  
Conference Date 2014-06-06 - 2014-06-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Power Transfer, etc 
Paper Information
Registration To WPT 
Conference Code 2014-06-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal of Theoretical Model for Foreign Object Detection in Wireless Power Transfer Systems 
Sub Title (in English)  
Keyword(1) Wireless Power Transfer Systems  
Keyword(2) FOD  
Keyword(3) Maxwell’s Equations  
Keyword(4) Eddy Current,  
Keyword(5) Mutual Impedance  
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1st Author's Name Atsuo Hatono  
1st Author's Affiliation MJHEP Program, MARA Japan Industrial Institute (MJHEP Program)
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Speaker
Date Time 2014-06-06 18:00:00 
Presentation Time 25 
Registration for WPT 
Paper # IEICE-WPT2014-34 
Volume (vol) IEICE-114 
Number (no) no.72 
Page pp.57-62 
#Pages IEICE-6 
Date of Issue IEICE-WPT-2014-05-30 


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