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Development of ultra-thin and high efficient flexible transmission coil for wireless power transfer

Research Project

Project/Area Number 18H01422
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21010:Power engineering-related
Research InstitutionShinshu University

Principal Investigator

MIZUNO TSUTOMU  信州大学, 学術研究院工学系, 教授 (90283233)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Keywords磁束経路制御技術 / 交流銅損 / 効率 / 発熱 / 表皮効果 / 近接効果 / コイルのQ値 / 伝送効率 / ワイヤレス電力伝送 / フレキシブルコイル / 超薄型 / 高効率 / 伝送コイル / フレキシブル
Outline of Final Research Achievements

Wireless power transmission in mobile devices requires a thin and highly efficient transmission coil. A copper foil coil pattern is used to reduce the thickness of the coil, but the AC resistance due to the skin and the proximity effects increases, the transmission efficiency decreases, and the heat generation of the coil increases.
Therefore, the principal investigator loaded a magnetic composite material, which is a mixture of magnetic powder and silicone resin, at an appropriate position on the coil. Then, the increase in the AC resistance of the coil was suppressed, and the efficiency was increased and the heat generation was reduced.

Academic Significance and Societal Importance of the Research Achievements

世界に先駆けて、平角導線における表皮効果と近接効果に起因する交流抵抗の増加を抑制する方法を提唱し、磁性コンポジット材を導線の適切な場所に装荷(磁束経路制御技術)することで、交流銅損を低減できることを実証した。
この技術は、ワイヤレス給電のコイルばかりでなく、産業界で多用されているコンバータのトランスの巻線にも適用可能である。
さらに、平角アルミニウム線にも有効であり、軽量化が強く望まれている、宇宙機器や航空機用モータなどへの適用が期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (23 results)

All 2021 2020 2019 2018 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (11 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Book (1 results) Remarks (1 results) Patent(Industrial Property Rights) (5 results)

  • [Journal Article] Effectiveness of Magnetic Composite Material on Copper Loss Reductions and Misalignment in Copper-plate-coils for Wireless Power Transmission2021

    • Author(s)
      Mitsuhide Sato, Shun Endo, Yinggang Bu, Tsutomu Mizuno
    • Journal Title

      IEEJ Transactions on Electrical and Electronic Engineering

      Volume: 16 Issue: 3 Pages: 470-477

    • DOI

      10.1002/tee.23318

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reduction of AC Copper Loss in Rectangular Copper Wire using Magnetic Path Control Technology2020

    • Author(s)
      鳥島 健太,志村 和大,佐藤 光秀,水野 勉
    • Journal Title

      IEEJ Transactions on Fundamentals and Materials

      Volume: 140 Issue: 7 Pages: 364-371

    • DOI

      10.1541/ieejfms.140.364

    • NAID

      130007867812

    • ISSN
      0385-4205, 1347-5533
    • Year and Date
      2020-07-01
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reduction of AC Resistance of Litz Wire Coil for Wireless Power Transmission Using Magnetic Tape2020

    • Author(s)
      遠藤 俊,前澤 拓実 ,杉本 海斗 佐藤 光秀,卜 穎剛,水野 勉
    • Journal Title

      Journal of the Japan Society of Applied Electromagnetics and Mechanics

      Volume: 28 Issue: 2 Pages: 134-139

    • DOI

      10.14243/jsaem.28.134

    • NAID

      130007925658

    • ISSN
      0919-4452, 2187-9257
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reducing the  alternating current resistance and heat generation in a single-wire coil using a magnetic tape2020

    • Author(s)
      Mitsuhide Sato, Kaito Sugimoto, Kazuma Kubota, Shun Endo, Tsutomu Mizuno
    • Journal Title

      IEEJ Transactions on Electrical and Electronic Engineering

      Volume: 15 Issue: 10 Pages: 1541-1548

    • DOI

      10.1002/tee.23224

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Low Copper Loss and High Efficiency of Wireless Power Transmission Coil using Magnetic Flux Path Control Technology2020

    • Author(s)
      水野 勉
    • Journal Title

      Journal of the Japan Society of Applied Electromagnetics and Mechanics

      Volume: 28 Issue: 4 Pages: 257-262

    • DOI

      10.14243/jsaem.28.257

    • NAID

      130007981419

    • ISSN
      0919-4452, 2187-9257
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] 磁性シートを用いたワイヤレス給電用放射電磁界ケースの発熱低減2021

    • Author(s)
      前澤 拓実,上田 将司,佐藤 光秀,卜 穎剛,水野 勉
    • Organizer
      電気学会リニアドライブ・交通・電気鉄道合同研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 磁性テープを用いた鉄道用高周波トランスの交流銅損低減2021

    • Author(s)
      久保田和馬,志村和大,佐藤光秀,水野 勉,小池徳男,櫻田昌之,根橋孝男
    • Organizer
      電気学会リニアドライブ・交通・電気鉄道合同研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 磁束経路制御技術を用いた電気機器・磁気部品の低損失化2021

    • Author(s)
      水野 勉
    • Organizer
      長野県テクノ財団 令和2年度「磁気エレクトロニクス研究会」
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] ワイヤレス給電の伝送効率向上のための磁束経路制御技術2020

    • Author(s)
      水野勉
    • Organizer
      2020 年電子情報通信学会通信ソサイエティ大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 鉄道用高周波トランスの軽量化と銅損低減のための磁性テープ巻平角アルミニウム巻線の検討2020

    • Author(s)
      志村 和大,久保田 和馬,田中 大登,佐藤 光秀,水野 勉
    • Organizer
      第29回MAGDAコンファレンスin大津~電磁現象及び電磁力に関するコンファレンス~
    • Related Report
      2020 Annual Research Report
  • [Presentation] Qi規格向け50Wクラスの電力伝送に用いる非接触給電用コイルの交流抵抗低減の検討2020

    • Author(s)
      服部雄介,村里康平,前澤拓実,上田将司,水野 勉,佐藤 光秀,卜穎剛
    • Organizer
      電気学会リニアドライブ・交通・電気鉄道合同研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 磁束経路制御技術を用いた非接触給電用フレキシブルコイルの伝送効率向上の検討2019

    • Author(s)
      服部 雄介,徳大路 悠太,三浦 大知,村里 康平,卜 穎剛,水野 勉
    • Organizer
      第 31 回「電磁力関連のダイナミクス」シンポジウム講演論文集
    • Related Report
      2019 Annual Research Report
  • [Presentation] AC Resistance Reduction of a Flexible Wireless Power Transmission Coil Using Magnetic Path Control Technology at 13.56 MHz2019

    • Author(s)
      Yuta Tokudaiji,Daichi Miura,Yusuke Hattori,Kohei Murasato,Yinggang Bu,Tsutomu Mizuno
    • Organizer
      2019 Joint MMM-Intermag Conference、BM-08
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of Structure and Material for Back Yoke at 13.56 MHz Wireless Power Transfer Focused on High Transmission Efficiency2019

    • Author(s)
      Daichi Miura,Yuta Tokudaiji,Yusuke Hattori,Kohei Murasato,Yinggang Bu,Tsutomu Mizuno
    • Organizer
      2019 Joint MMM-Intermag Conference、BM-09
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 磁束経路制御技術を用いた非接触給電用フレキシブルコイルの交流抵抗低減2018

    • Author(s)
      徳大路 悠太,三浦 大知,服部 雄介,村里 康平,卜 穎剛,水野 勉
    • Organizer
      電子情報通信学会、信学技報、WPT2018-38、51-56
    • Related Report
      2018 Annual Research Report
  • [Presentation] 13.56 MHz非接触電力伝送用バックヨークの高効率化に向けた構造と材質に関する検討2018

    • Author(s)
      三浦 大知,徳大路 悠太,村里 康平,服部 雄介,卜 穎剛,水野 勉
    • Organizer
      電気学会マグネティックス研究会、MAG-18-224、99-104
    • Related Report
      2018 Annual Research Report
  • [Book] 基礎から学ぶ磁性材料2020

    • Author(s)
      佐藤 勝昭 監修
    • Total Pages
      293
    • Publisher
      株式会社R&D支援センター
    • Related Report
      2019 Annual Research Report
  • [Remarks] 水野・佐藤研究室

    • URL

      http://mizunolab.shinshu-u.ac.jp/

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
  • [Patent(Industrial Property Rights)] 磁性体被覆導線および磁性体被覆導線の製造方法2020

    • Inventor(s)
      水野 勉,佐藤 光秀,卜 穎剛
    • Industrial Property Rights Holder
      水野 勉,佐藤 光秀,卜 穎剛
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-005767
    • Filing Date
      2020
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] モータ2019

    • Inventor(s)
      水野 勉、佐藤 光秀
    • Industrial Property Rights Holder
      水野 勉、佐藤 光秀
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-138421
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] コイルおよびコイルユニットおよび無線電力伝送装置およびコイルの製造方法2019

    • Inventor(s)
      水野 勉,佐藤 光秀,卜 穎剛
    • Industrial Property Rights Holder
      水野 勉,佐藤 光秀,卜 穎剛
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-193299
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report
  • [Patent(Industrial Property Rights)] モータ2018

    • Inventor(s)
      水野勉、卜穎剛
    • Industrial Property Rights Holder
      水野勉、卜穎剛
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-160780
    • Filing Date
      2018
    • Related Report
      2018 Annual Research Report
  • [Patent(Industrial Property Rights)] ワイヤレス電力伝送コイルユニット2018

    • Inventor(s)
      水野勉、卜穎剛
    • Industrial Property Rights Holder
      水野勉、卜穎剛
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-172049
    • Filing Date
      2018
    • Related Report
      2018 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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