Research on Virtual Mechanical Connection for Magnetically Coupled Wireless Power Transfer

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14154
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21020:Communication and network engineering-related
• Research Institution: The 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
• Keywords: 無線給電 / 磁界結合 / 電磁力

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.

Free Research Field

無線工学

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．