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Study of High Stable Magnetic Field by Superconducting Transformer

Research Project

Project/Area Number 16560245
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 電力工学・電気機器工学
Research InstitutionKyushu Institute of Technology

Principal Investigator

OTABE Soji  Kyushu Institute of Technology, Faculty of Computer Science and Systems Engineering, Associate Professor, 情報工学部, 助教授 (30231236)

Co-Investigator(Kenkyū-buntansha) KIUCHI Masaru  Kyushu Institute of Technology, Faculty of Computer Science and Systems Engineering, Research Associate, 情報工学部, 助手 (90304758)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
KeywordsSuperconducting Transformer / DC mode / Coupling Coefficient / Time Constant
Research Abstract

In 2004, DC transport current was tried to be induced by 500A class superconducting transformer. However, since the superconducting transformer was design to obtain high current, it was difficult to hold DC current for long time. In 2005, a new superconducting transformer was designed and fabricated in order to hold DC current for long time even though the magnitude of the current was small. The transport current induce in secondary winding was measured by the voltage at the low resistive shunt resistor inserted in the secondary winding. The current at the first winding of the superconducting transformer was controlled by PID method. For the result, the controlled time was extended to about 1 second. The control accuracy was within plus minus 0.4%. This value is far from 1 ppm which is required by NMR and MRI.
In 2006, the accurate of current was tried to be improved by the knowledge obtained in previous studies. It is necessary to correctly measure the current induced in the secondary winding in order to obtain the stable current. Therefore, the magnetic field induced in the secondary windings was measured by a hole sensor and a pickup coil. The current of the first windings was controlled by the measured current of the secondary windings. As the result, the pickup method was better than the hole sensor method, and the more accurate control was established.
In summary, the DC mode of the current induced in the secondary winding of the superconducting transformer is performed and confirmed. The methods to obtain stabilized magnetic field and current were proposed and performed. It is considered that these methods will be applied to many kinds of superconducting apparatuses. For example, the present knowledge will be applied to NMR and MRI facilities to obtain high stability magnetic field.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (3 results)

All 2006

All Journal Article (3 results)

  • [Journal Article] Generation of DC current with high-stability by using a superconducting transformer2006

    • Author(s)
      B Ni, S Hakoda, E S Otabe, M Kiuchi
    • Journal Title

      Journal of Physics : Conference Series 43

      Pages: 837-840

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Generation of DC current with high-stability by using a superconducting transformer2006

    • Author(s)
      B Ni, S Hakoda, E S Otabe, M Kiuchi
    • Journal Title

      Journal of Physics : Conference Series Vol. 43

      Pages: 837-840

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Generation of DC current with high-stability by using a superconducting transformer2006

    • Author(s)
      B Ni, S Hakoda, E S Otabe, M Kiuchi
    • Journal Title

      Proceedings of EUCAS2005 (掲載決定)

    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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