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Magnetic levitation control of high-temperature superconducting floating coils using image-data processing

Research Project

Project/Area Number 14580532
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

YANAGI Nagato  National Institute for Fusion Science, Department of LHD Project, Associate Professor, 大型ヘリカル研究部, 助教授 (70230258)

Co-Investigator(Kenkyū-buntansha) MITO Toshiyuki  National Institute for Fusion Science, Department of LHD Project, Professor, 大型ヘリカル研究部, 教授 (10166069)
HAMAGUCHI Shinji  National Institute for Fusion Science, Department of LHD Project, Research Associate, 大型ヘリカル研究部, 助手 (00311209)
CHIKARAISHI Hirotaka  National Institute for Fusion Science, Department of LHD Project, Associate Professor, 大型ヘリカル研究部, 助教授 (60249969)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2003: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2002: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordsmagnetic levitation / high-temperature superconductor / levitation control / LabVIEW / Super-SINET / internal coil device / image-data processing / remote control / Super SINET / PID制御 / 遠隔操作 / Mini-RT / 核融合プラズマ / 高温超伝導 / デジタル制御 / 浮上安定化
Research Abstract

A new feedback control scheme using image-data processing is proposed for magnetic levitation of superconducting floating coils such as used in the Mini-RT project. In the conventional system of our previous studies, the position of a floating coil was measured using laser sensors, and the current of the levitating coil was controlled with an analog PID circuit. The new system has incorporated a digital control program with personal computers(PC). A graphical measurement-and-control software, LabVIEW is used in the system and a sufficient feedback-control capability was confirmed by levitating permanent magnets. A miniature superconducting floating coil was fabricated using silver-sheathed Bi-2223 high-temperature superconducting cables and this could also be successfully levitated. In addition to the main PC that directly drives the PID control program, a local PC and a remote PC are also used. The real-time image of the floating coil is taken by a local PC with a CCD camera. A remote … More PC can obtain this image and can also change the parameters necessary for the PID control. The system was connected to the fast network, Super-SINET, and the magnetic levitation experiment was conducted with a remote control from the Univ. of Tokyo. As described above, the present system has already attained sufficiently sophisticated capabilities, however, the magnetic levitation with a direct image-data processing has not yet been completed. We have examined some problems related with this control scheme, such as that the characteristic time constant of control becomes much longer than that with laser sensors due to the slow frame rate of a camera. However, it was confirmed by an experiment that the characteristic time constant of motion of a superconducting coil is effectively long due to the conservation of magnetic flux, and thus, the levitation control using image data can be applied. On the other hand, the conservation of magnetic flux in superconducting coils gives another interesting finding of self-stabilized magnetic levitation, which is supposed to be used in some engineering applications. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (13 results)

All 2004 2003 2002 Other

All Journal Article (10 results) Publications (3 results)

  • [Journal Article] Experiments of the HTS Floating Coil System in the Mini-RT Project2004

    • Author(s)
      N.Yanagi, T.Mito, J.Morikawa, et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity 14

      Pages: 1539-1542

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Mini-RT装置用高温超伝導磁気浮上コイルの開発2004

    • Author(s)
      柳 長門, 三戸利行, 森川惇二ら
    • Journal Title

      超伝導・低温工学会誌 39

      Pages: 193-200

    • NAID

      10012362113

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Mini-RT装置用高温超伝導磁気浮上コイルの冷却・励磁試験2004

    • Author(s)
      柳 長門, 森川惇二, 三戸利行ら
    • Journal Title

      超伝導・低温工学会誌 39

      Pages: 201-208

    • NAID

      10012362124

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Experiments of the HTS Floating Coil System in the Mini-RT Project2004

    • Author(s)
      Yanagi, N., Mito, T., Morikawa, J., et al.
    • Journal Title

      IEEE Trans.Appl.Supercond. 14

      Pages: 1539-1542

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Engineering Development of the HTS Floating Coil in the Mini-RT Project(in Japanese)2004

    • Author(s)
      Yanagi, N., Mito, T., Morikawa, J., et al.
    • Journal Title

      J.Cryo.Sco.Jpn. 39

      Pages: 193-200

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Cool-down and Excitation Tests of the HTS Floating Coil in the Mini-RT Project(in Japanese)2004

    • Author(s)
      Yanagi, N., Morikawa, J., Mito, T., et al.
    • Journal Title

      J.Cryo.Soc.Jpn. 39

      Pages: 201-208

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Excitation test results of the HTS floating coil for the Mini-RT project2003

    • Author(s)
      N.Yanagi, T.Mito, Y.Hishinuma, et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity 13

      Pages: 1504-1507

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Excitation Test Results of the HTS Floating Coil for the Mini-RT Project2003

    • Author(s)
      Yanagi, N., Mito, T., Hishinuma, Y., et al.
    • Journal Title

      IEEE Trans.Appl.Supercond. 13

      Pages: 1504-1507

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Engineering Research and Development of Magnetically-Levitated High-Temperature Superconducting Coil System for Mini-RT Project2002

    • Author(s)
      N.Yanagi, J.Morikawa, T.Mito, et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity 12

      Pages: 948-951

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Engineering research and development of magnetically levitated high-temperature superconducting coil system for Mini-RT project2002

    • Author(s)
      Yanagi, N., Morikawa, J., Mito, T., et al.
    • Journal Title

      IEEE Trans.Appl.Supercond. 12

      Pages: 948-951

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] N.Yanagi, J.Morikawa, T.Mito, et al.: "Engineering Research and Development of Magnetically-Levitated High-Temperature Superconducting Coil System for Mini-RT Project"IEEE Transactions on Applied Superconductivity. 12. 948-951 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] N.Yanagi, T.Mito, Y.Hishinuma, et al.: "Excitation test results of the HTS floating coil for the Mini-RT project"IEEE Transactions on Applied Superconductivity. 13. 1504-1507 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yanagi, T.Mito, J.Morikawa, et al.: "Experiments of the HTS Floating Coil System in the Mini-RI Project"IEEE Transactions on Applied Superconductivity. 14(To be published). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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