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    교류 운전용 고온 초전도 자석의 설계 및 열적 안정성에 관한 연구 = A study on design of AC HTS magnet and its thermal stability

    한글로보기

    https://www.riss.kr/link?id=T14071228

    • 저자
    • 발행사항

      창원 : 창원대학교, 2016

    • 학위논문사항
    • 발행연도

      2016

    • 작성언어

      한국어

    • KDC

      553.8 판사항(5)

    • 발행국(도시)

      경상남도

    • 형태사항

      iv, 59장 ; 26 cm

    • 일반주기명

      지도교수: 김석호
      창원대학교 논문은 저작권에 의해 보호받습니다

    • 소장기관
      • 국립중앙도서관 국립중앙도서관 우편복사 서비스
      • 국립창원대학교 도서관 (창원캠퍼스) 소장기관정보

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    다국어 초록 (Multilingual Abstract) kakao i 다국어 번역

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    한국어
    This paper presents a study on design of AC high temperature superconducting (HTS) magnet and its thermal stability. To realize fast variation of high magnetic field for magnetic refrigerator, AC operation is required. Generally, a permanent magnet or superconducting magnet is used to make magnetic field for magnetic refrigerator. Compared with the permanent magnet and the HTS magnet, the HTS magnet has advantage of high magnetic field and the magnetic field can be easily changed by controlling the transport current. Considering the design requirement of the magnetic refrigerator for a hydrogen re-liquefaction system, it requires 2.6 T and 3 T for different magnetic refrigerants and it can be achieved by stacking the different double pancake coils (DPCs).
    Thermal stability is very important point to prevent HTS magnet's damage from a quench. Generally, the quench can be easily generated by other problems, like AC loss, increase temperature and over current at an extremely low temperature. Also AC operation generates AC loss, which is composed by eddy current loss and hysteresis loss and AC loss changes heat loss. Thus to make sure of thermal stability, several verification method should be tested in liquid nitrogen and 20 K temperature using a conduction cooling test apparatus.
    In this paper, the HTS magnet is designed and fabricated to generate 3 T with 1 T/s and it has 25.4 mm inner diameter’s bobbin with aluminum. HTS layer of 4.2 mm width is used about 1.2 km for winding each DPC. The HTS magnet is composed of 12 DPCs and each DPC has different size to generate the required field distribution. AC loss and eddy current loss are generated at the HTS conductor and the magnet bobbin by the alternating magnetic field and the transport current. Therefore, the bobbin structures should have several slits to reduce eddy current loss. All DPCs are tested its performance in liquid nitrogen. After that, the HTS magnet which is stacked 12 DPCs is tested to check critical current and distribution of temperature by charge and discharge of operating current related with ramping rate in a conduction cooling test apparatus with two stage Gifford McMahon (GM) cryocooler.
    번역하기

    This paper presents a study on design of AC high temperature superconducting (HTS) magnet and its thermal stability. To realize fast variation of high magnetic field for magnetic refrigerator, AC operation is required. Generally, a permanent magnet or...

    This paper presents a study on design of AC high temperature superconducting (HTS) magnet and its thermal stability. To realize fast variation of high magnetic field for magnetic refrigerator, AC operation is required. Generally, a permanent magnet or superconducting magnet is used to make magnetic field for magnetic refrigerator. Compared with the permanent magnet and the HTS magnet, the HTS magnet has advantage of high magnetic field and the magnetic field can be easily changed by controlling the transport current. Considering the design requirement of the magnetic refrigerator for a hydrogen re-liquefaction system, it requires 2.6 T and 3 T for different magnetic refrigerants and it can be achieved by stacking the different double pancake coils (DPCs).
    Thermal stability is very important point to prevent HTS magnet's damage from a quench. Generally, the quench can be easily generated by other problems, like AC loss, increase temperature and over current at an extremely low temperature. Also AC operation generates AC loss, which is composed by eddy current loss and hysteresis loss and AC loss changes heat loss. Thus to make sure of thermal stability, several verification method should be tested in liquid nitrogen and 20 K temperature using a conduction cooling test apparatus.
    In this paper, the HTS magnet is designed and fabricated to generate 3 T with 1 T/s and it has 25.4 mm inner diameter’s bobbin with aluminum. HTS layer of 4.2 mm width is used about 1.2 km for winding each DPC. The HTS magnet is composed of 12 DPCs and each DPC has different size to generate the required field distribution. AC loss and eddy current loss are generated at the HTS conductor and the magnet bobbin by the alternating magnetic field and the transport current. Therefore, the bobbin structures should have several slits to reduce eddy current loss. All DPCs are tested its performance in liquid nitrogen. After that, the HTS magnet which is stacked 12 DPCs is tested to check critical current and distribution of temperature by charge and discharge of operating current related with ramping rate in a conduction cooling test apparatus with two stage Gifford McMahon (GM) cryocooler.

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