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.
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.
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