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Research on Virtual Mechanical Connection for Magnetically Coupled Wireless Power Transfer

Research Project

Project/Area Number 21K14154
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21020:Communication and network engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Narusue Yoshiaki  東京大学, 大学院工学系研究科(工学部), 准教授 (70804772)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords無線給電 / 磁界結合 / 電磁力 / 無線電力伝送 / 機械的接続機構
Outline of Research at the Start

無線給電機能を具備する電子機器を有線接続で充電するユーザは少なくなく,無線給電が期待通りに普及しているとは言い難い.普及を妨げる1つの要因として「スマートフォンの位置がずれていて充電できていなかった」などの予期せぬ動作不良の存在がある.それに対し,ケーブルを接続する有線接続は,ケーブルが電気的接続のみならず機械的接続としても機能することで予期せぬ動作不良を防いでいる.そこで本研究では,無線給電のための仮想的な機械的接続機構を開発する.給電可能範囲の内側から外側へ移動しようとする受電機器に対して,給電可能範囲の内側に留まらせようとする遠隔作用の力を発生させることで,予期せぬ動作不良を防止する.

Outline of Final Research Achievements

This research project established a mechanical connection mechanism utilizing electromagnetic force for wireless power transfer (WPT) systems. We designed the configuration of the mechanical connection mechanism, considering the size constraints of WPT systems. This included the design and experimental evaluation of single-core dual coils that function both as an electromagnet coil and a wireless power transfer coil with a single ferrite core. It was experimentally confirmed that the single-core dual coils can generate an attractive and repulsive force of up to approximately 2N and provide a maximum WPT efficiency of 88% when using a Qi-standard compatible coil as a receiver. Additionally, we examined the user interface based on the mechanical connection mechanism and developed an automatic coil design mechanism, which is necessary for integrating the mechanical connection mechanism into small devices.

Academic Significance and Societal Importance of the Research Achievements

本研究により得られた成果は,無線給電システムに力を提示する機構を付与する技術を示しており,より使いやすい無線給電システムの実現に寄与するものである.無線給電分野の研究開発は,給電可能範囲の拡大,給電効率の向上,電磁両立性の確保,人体防護など電気的機能に集中しており,本研究の成果は他に類を見ない独自性を備えている.本研究をきっかけとして,無線給電システムが備えるべき機能群を再定義するための足がかりともなりうる研究成果といえる.

Report

(3 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (14 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Journal Article] Communication-Less Receiver-Side Resonant Frequency Tuning for Magnetically Coupled Wireless Power Transfer Systems2023

    • Author(s)
      K. Matsuura, D. Kobuchi, Y. Narusue, and H. Morikawa
    • Journal Title

      IEEE Access

      Volume: 11 Pages: 23544-23556

    • DOI

      10.1109/access.2023.3251987

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cancellation of Harmonics in the Magnetic Field Leakage From Inductive Power Transfer Systems2022

    • Author(s)
      D. Kobuchi, K. Matsuura, Y. Narusue, and H. Morikawa
    • Journal Title

      IEEE Transactions on Vehicular Technology

      Volume: 72 Issue: 4 Pages: 4442-4452

    • DOI

      10.1109/tvt.2022.3223762

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic Energy Minimization for Suppressing Magnetic Field Intensity of Inductive Power Transfer Systems2022

    • Author(s)
      Y. Narusue, H. Morikawa
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 58 Issue: 2 Pages: 1-5

    • DOI

      10.1109/tmag.2021.3090922

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic Field Leakage Cancellation in Multiple-Input Multiple-Output Wireless Power Transfer Systems2022

    • Author(s)
      D. Kobuchi, K. Matsuura, Y. Narusue, H. Morikawa
    • Journal Title

      IEEE Magnetics Letters

      Volume: 13 Pages: 1-4

    • DOI

      10.1109/lmag.2022.3151065

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 共振結合型ワイヤレス電力伝送向け可変リアクタ2021

    • Author(s)
      成末義哲
    • Journal Title

      電子情報通信学会 B-plus

      Volume: 15 Pages: 23-33

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] キャパシタ充放電制御による共振型無線給電向け受電側FET ブリッジ型可変リアクタの検討2023

    • Author(s)
      松浦賢太郎, 成末義哲, 森川博之
    • Organizer
      電子情報通信学会総合大会
    • Related Report
      2022 Research-status Report
  • [Presentation] MIMO無線電力伝送システムにおける位相復元を用いたZ行列推定手法の実験評価2023

    • Author(s)
      小渕大輔, 成末義哲, 森川博之
    • Organizer
      電子情報通信学会総合大会
    • Related Report
      2022 Research-status Report
  • [Presentation] MLAB-WPT2022

    • Author(s)
      A. Yamaguchi, Z. Lin, K. Matsuura (Supervisor: Y. Narusue)
    • Organizer
      APMC Student and Young Engineer Design Competition WPT Track
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Communication-Less Impedance Adjustment for Suppressing Magnetic Field Intensity of Inductive Power Transfer Systems2022

    • Author(s)
      K. Matsuura, Y. Narusue, and H. Morikawa
    • Organizer
      IEEE Wireless Power Transfer Conference
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Z-Parameter Estimation for Multiple-Input Multiple-Output Wireless Power Transfer Systems via Phase Retrieval Method2022

    • Author(s)
      D. Kobuchi, J. Ahn, Y. Narusue, and H. Morikawa
    • Organizer
      IEEE Wireless Power Transfer Conference
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] [招待講演]IoT/CPS基盤としての無線電力伝送技術の研究開発2022

    • Author(s)
      成末義哲
    • Organizer
      電子情報通信学会無線電力伝送研究会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] [依頼講演]IoT/CPS基盤としての無線電力伝送技術の研究開発と展望2022

    • Author(s)
      成末義哲
    • Organizer
      電子情報通信学会スマート無線研究会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 磁界結合型無線電力伝送における入力電圧波形設計に基づく高調波磁界強度低減2021

    • Author(s)
      小渕大輔,松浦賢太郎,成末義哲,森川博之
    • Organizer
      電子情報通信学会 無線電力伝送研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] IoT/CPS基盤としてのワイヤレス給電技術2021

    • Author(s)
      成末義哲,生形 貴,篠原笑子,森川博之
    • Organizer
      電子情報通信学会 無線通信システム研究会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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