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Pumping-up Current Characteristics of Linear Type Magnetic Flux Pump

Chung, Yoondo   (Dept. of Electrical Engineering, Kyoto Univeristy  ); Muta, Itsuya   (Dept. of Electrical Engineering, Kyoto Universit  ); Hoshino, Tsutomu   (Dept. of Electrical Engineering, Kyoto Universit  ); Nakamura, Taketsune   (Dept. of Electrical Engineering, Kyoto Universit  ); Ko, Taekuk   (Dept. of Electrical Engineering, Yonsei UniversityUU0000936  );
  • 초록

    The linear type flux pump aims to compensate a little bit decremental persistent current of the HTS magnet in NMR and MRI spectrometers. The flux pump mainly consists of DC bias coil, 3-phase AC coil and Nb foil. The persistent current in closed superconductive circuit can be easily adjusted by the 3-phase AC current, its frequency and the DC bias current. In the experiment, it has been investigated that the flux pump can effectively charge the current in the load coil of 543 mH for various frequencies in 18 minutes under the DC bias of 10 A and the AC of 5 $A_{rms}$ . The maximum magnitudes of pumping current and load magnet voltage are 0.72 A/min and 20 ㎷, respectively. Based on simulation results by the FEM are proved to nearly agree with experimental ones.


  • 주제어

    linear type magnetic flux pump .   NMR magnet system .   persistent current compensator.  

  • 참고문헌 (12)

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    5. Magnetic field distributions of a linear type magnetic flux pump to compensate a little decremented persistent current of HTS magnets for NMR using FEM , Y.D.Chung;I.Muta;T.Nakamura;T.Hoshino , 2003 National Convention IEE Japan / v.5,pp.278-279,
    6. Study on brushless superconducting generator excited by magnetic flux pump , H.Tsukiji , Ph.D. dissertation, Kyoto University / v.,pp.,
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    9. Preparatory FEM analysis of a linear type magnetic flux pump for compensating a little decremented persistent current of HTS magnets , Y.D.Chung;I.Muta;T.Nakamura;T.Hoshino , 2002 Kansai-Section Joint Convention of Institutes of Electrical Eng. Japan / v.,pp.,
    10. Design fabrication and test of a discrete-foil-type superconducting power supply , H.M.Kim;C.J.Lee;T.K.Ko;Y.S.Yoon;S.J.Lee;T.S.Han;S.S.Oh , Cryogenics / v.41,pp.189-194,
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