低温物理学报
低溫物理學報
저온물이학보
CHINESE JOURNAL OF LOW TEMPERATURE PHYSICS
2003年
3期
202-208
,共7页
任仲友%王家素%王素玉%王晓融%宋宏海%王兴志%郑珺
任仲友%王傢素%王素玉%王曉融%宋宏海%王興誌%鄭珺
임중우%왕가소%왕소옥%왕효융%송굉해%왕흥지%정군
悬浮力%YBaCuO%高温超导体
懸浮力%YBaCuO%高溫超導體
현부력%YBaCuO%고온초도체
levitation force%YBaCuO%high temperature superconductor
本文给出了三种提高YBCO块材在外磁场中悬浮力的方法.第一种方法是增强外磁场,对于此方法,本文研究了一块直径为30mm的圆柱状YBCO块材分别在圆柱状NdFeB永磁体和NdFeB永磁导轨上的悬浮力.测量结果表明在77K温度下YBCO块在圆柱状NdFeB永磁体上的最大悬浮力为50N,在NdFeB永磁导轨上的最大悬浮力为103.0N.第二种方法是提高YBCO块材自身的性能,包括临界电流密度、俘获磁通和块材尺寸,对于此方法,本文仅研究了块材尺寸对悬浮力的影响.三块直径分别为30mm、35mm、40mm的圆柱状YBCO块材在NdFeB永磁导轨上的悬浮力被测量,77K温度下5mm悬浮间距时的悬浮力分别为103.0N、134.5N、175.0N.第三方法是将YBCO块材变成准永久磁体,此种情况下,直径为40mm的圆柱状YBCO块材在77K温度下5mm悬浮间距时的悬浮力高达218.3N.
本文給齣瞭三種提高YBCO塊材在外磁場中懸浮力的方法.第一種方法是增彊外磁場,對于此方法,本文研究瞭一塊直徑為30mm的圓柱狀YBCO塊材分彆在圓柱狀NdFeB永磁體和NdFeB永磁導軌上的懸浮力.測量結果錶明在77K溫度下YBCO塊在圓柱狀NdFeB永磁體上的最大懸浮力為50N,在NdFeB永磁導軌上的最大懸浮力為103.0N.第二種方法是提高YBCO塊材自身的性能,包括臨界電流密度、俘穫磁通和塊材呎吋,對于此方法,本文僅研究瞭塊材呎吋對懸浮力的影響.三塊直徑分彆為30mm、35mm、40mm的圓柱狀YBCO塊材在NdFeB永磁導軌上的懸浮力被測量,77K溫度下5mm懸浮間距時的懸浮力分彆為103.0N、134.5N、175.0N.第三方法是將YBCO塊材變成準永久磁體,此種情況下,直徑為40mm的圓柱狀YBCO塊材在77K溫度下5mm懸浮間距時的懸浮力高達218.3N.
본문급출료삼충제고YBCO괴재재외자장중현부력적방법.제일충방법시증강외자장,대우차방법,본문연구료일괴직경위30mm적원주상YBCO괴재분별재원주상NdFeB영자체화NdFeB영자도궤상적현부력.측량결과표명재77K온도하YBCO괴재원주상NdFeB영자체상적최대현부력위50N,재NdFeB영자도궤상적최대현부력위103.0N.제이충방법시제고YBCO괴재자신적성능,포괄림계전류밀도、부획자통화괴재척촌,대우차방법,본문부연구료괴재척촌대현부력적영향.삼괴직경분별위30mm、35mm、40mm적원주상YBCO괴재재NdFeB영자도궤상적현부력피측량,77K온도하5mm현부간거시적현부력분별위103.0N、134.5N、175.0N.제삼방법시장YBCO괴재변성준영구자체,차충정황하,직경위40mm적원주상YBCO괴재재77K온도하5mm현부간거시적현부력고체218.3N.
Three methods are presented to enhance levitation force of YBCO bulk in applied magnetic field. The first one is to strengthen applied magnetic field. For this method, levitation forces of a YBCO bulk with 30mm in diameter are studied over a single NdFeB cylinder and a NdFeB guideway respectively and their maximum levitation forces are 50.0N for the NdFeB cylinder and 103.0N for the NdFeB guideway at 77K. The second one is to promote properties of YBCO bulk itself, including critical current density and trapped flux and its size. Here, levitation forces of three YBCO bulks with 30mm, 35mm, 40mm in diameter are studied over a NdFeB guideway, and levitation forces at gap 5mm are 103.0N, 134.5N and 175.0N at 77K, respectively. The last one is to change a YBCO bulk into a superconducting quasi-permanent magnet, levitation force of a YBCO bulk with 40 mm in diameter is up to 218.3N at 5mm gap over a NdFeB guideway at 77K by this method.
