Development of optimum magnetizing technology for field poles of superconducting synchronous motors for ship propulsion

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21044
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Ida Tetsuya 東京海洋大学, 学術研究院, 教授 (80344026)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: パルス着磁 / 高温超電導バルク / 超電導同期電動機 / 船舶推進器 / 超電導界磁極 / 超電導同期発電機

Outline of Final Research Achievements

The purpose of this study is to establish a pulse magnetization technique to ensure high performance of superconducting bulk motors for ship propulsion in actual operation. Pulse magnetization using vortex-type copper coils was attempted at liquid nitrogen temperature on an array consisting of three GdBCO bulks that imitate field poles. When the three coils placed opposite each other in the bulk were connected in series, a flux density distribution similar to that obtained by magnetization in a static magnetic field was obtained. When pulsed magnetic fields were applied to the three bulks in sequence, a reduction of up to 12% of the trapped flux density was observed in the center of the adjacent bulk due to interference from each other's pulsed magnetic field. However, by devising the conditions for sequential magnetization, it was possible to improve the magnetic flux density distribution compared to magnetization using coils connected in series.

Free Research Field

電子工学

Academic Significance and Societal Importance of the Research Achievements

高温超電導バルク材料は永久磁石の数倍を超える強磁場を発生する磁石として、船舶推進器や発電機の小型化、効率化を果たす可能性を持つ。しかし、現在のところ大型で高品質な材料を製造することは技術的に困難であり、大出力を扱うために総磁束を増やすためには複数の材料を集積して界磁極を構成する必要がある。本研究はそのように集積した高温超電導バルク材料に強磁場を捕捉させて使用するために必要な手法を模索したものである。本研究の成果は高温超電導バルク材料の搭載による小形/高出力・高効率な舶用推進機のみならず、海洋エネルギーを含む発電機の実現に向けて先鞭を付けたものである。