Study on the wireless power transmission system for the railway vehicles using the high-temperature superconducting coils with thermal stability

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22414
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Okayama University
• Principal Investigator: Inoue Ryota 岡山大学, 自然科学学域, 助教 (80881127)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 非接触給電システム / 高温超電導コイル / 交流損失 / 熱的安定性 / 鉄道 / 冷却システム

Outline of Final Research Achievements

In order to design the WPT system using the HTS coil with thermal stability, we analyzed the frequency characteristics of the critical current in the HTS coil above 1 kHz using FEM analysis, and investigated the operating conditions considering thermal stability in the WPT system using HTS coil for the railway vehicles. As a result, we found that the thermally stable WPT system using the HTS coil for the railway vehicle capable of fast charging can be realized by operating current at the frequency of about 2 kHz. Also, the receiving power density of the WPT system for the railway vehicles was improved by the HTS coil structures using the narrow REBCO wires.

Free Research Field

電力工学

Academic Significance and Societal Importance of the Research Achievements

本研究課題では，kHz帯におけるHTSコイルの発熱と冷媒間の伝熱特性が非接触給電システムへ与える影響について検討した。その結果，1 kHz以上の高周波電流通電時におけるHTS線材の焼損原因が交流損失の増加に伴う臨界電流の低下であることを明らかにした点に学術的意義がある。また，本研究課題で提案したHTSコイル形状により，熱的に安定な高温超電導コイルを用いた非接触給電システムの基本設計が可能となるため，非接触給電技術の鉄道への適用拡大を促す点に社会的意義がある。