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| Presentation | 2018-11-22 15:10 [Poster Presentation] An Electromagnetic Field Reduction Method for Inductive Power Transfer in Transportation System Jedok Kim, Seungyoung Ahn (KAIST)  EMCJ2018-75 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Currently, charging electric transportation systems with wireless power transfer (WPT) technologies are drawing strong attention. The advantages of WPT application to transportation systems are that WPT can provide safety and convenience enhancement compared to the conductive charging methods. There are many types of WPT technologies such as acoustic, light, capacitive, and inductive power transfer (IPT), and usually IPT is used for charging electric transportation system because of their high power capacity and efficiency. However, the IPT system for transportations require to use high electrical power. This means that high density magnetic field would be generated in the vicinity of the IPT system during the operation. If leakage magnetic fields is radiated from IPT system to the human, it will negative influence to human health. Therefore, leakage magnetic field should be minimized for preventing negative effect to human body. In order to reduce leakage magnetic field, shielding methods such as passive shielding and active shielding can be applied. Passive shielding methods could be classified into conductive shielding and magnetic shielding. Conductive shielding method provides high shielding performances, but high heats could be generated because of eddy current. In addition, some magnetic fields are eliminated by eddy losses so power transfer efficiency could be decreased. Magnetic shielding method is to regulate magnetic flux path using ferromagnetic materials. Magnetic shielding provides efficiency enhancement based on their high permeability. However, shielding performance is not effective when magnetic flux paths have air gap. Active shielding is another way to reduce electromagnetic field and this can effectively reduce the leakage magnetic field of high power IPT system. A principle of active shielding is to eliminate leakage magnetic fields by canceling magnetic field, which has the opposite vector direction compare to leakage magnetic field. The active shielding system provides high shielding performance. However, the Active shielding system requires an additional power source for generating canceling magnetic field. This requirement makes system efficiency degradation in terms of total energy consumption because some electrical power should be used for generating canceling magnetic field. Therefore, electromagnetic field reduction method for high power inductive power transfer application (IPT) that can provide high leakage magnetic field reduction performance with minimizing efficiency degradation is necessary. This paper proposes an electromagnetic field reduction method for high power IPT application in transportation system using single reactive shield coil. A reactive shield generates canceling magnetic field by leakage magnetic field so additional power source is not required unlike active shielding system. In addition, reactive shield can provide high shielding performance like active shield system because reactive shield generates canceling magnetic field as well. A proposed reactive shield application method has been verified by EM simulation in terms of total magnetic fields in the vicinity of the transportation IPT system. Simulation results show that the proposed method can effectively reduce leakage magnetic field at observation points. |
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| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Inductive Power Transfer / Electromagnetic Field Reduction / Electromagnetic Shielding / Wireless Power Transfer / Electromagnetic Compatibility / Transportation Electrification / / | |
| Reference Info. | IEICE Tech. Rep., vol. 118, no. 317, EMCJ2018-75, pp. 53-53, Nov. 2018. | |
| Paper # | EMCJ2018-75 | |
| Date of Issue | 2018-11-15 (EMCJ) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and 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) | |
| Download PDF | EMCJ2018-75 |
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| Conference Information | |
| Committee | EMCJ IEE-EMC IEE-MAG |
| Conference Date | 2018-11-22 - 2018-11-23 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | KAIST |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | EMC Joint Workshop 2018, Daejon |
| Paper Information | |
| Registration To | EMCJ |
| Conference Code | 2018-11-EMCJ-EMC-MAG |
| Language | English |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | An Electromagnetic Field Reduction Method for Inductive Power Transfer in Transportation System |
| Sub Title (in English) | |
| Keyword(1) | Inductive Power Transfer |
| Keyword(2) | Electromagnetic Field Reduction |
| Keyword(3) | Electromagnetic Shielding |
| Keyword(4) | Wireless Power Transfer |
| Keyword(5) | Electromagnetic Compatibility |
| Keyword(6) | Transportation Electrification |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Jedok Kim |
| 1st Author's Affiliation | Korea Advanced Institute of Science and Technology (KAIST) |
| 2nd Author's Name | Seungyoung Ahn |
| 2nd Author's Affiliation | Korea Advanced Institute of Science and Technology (KAIST) |
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| Speaker | Author-1 |
| Date Time | 2018-11-22 15:10:00 |
| Presentation Time | 60 minutes |
| Registration for | EMCJ |
| Paper # | EMCJ2018-75 |
| Volume (vol) | vol.118 |
| Number (no) | no.317 |
| Page | p.53 |
| #Pages | 1 |
| Date of Issue | 2018-11-15 (EMCJ) |
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