垂向磁场变化量对高温超导块材悬浮力特性的影响

高温超导体因其无源自稳定的特性,受到许多学者的重视,具有广阔的应用前景.目前针对高温超导块材悬浮性能的研究主要集中于由永磁体产生的低磁场环境.本文基于超导磁体平台提供的强磁场环境,通过改变高温超导块材不同的场冷高度,实验研究了高温超导块材悬浮力与垂向磁场变化量的关系.研究结果表明随着垂向磁场变化量的增加,高温超导块材的悬浮力增长趋缓,并最终出现悬浮力饱和的现象.本文还对比了YBCO 和Gd-BCO 两种不同材料超导块材的悬浮性能,结果发现GdBCO 的悬浮力在强磁场环境中表现出更大的潜力.这为高温超导磁浮在强磁场中的应用奠定了基础,通过更加合理地调节磁场的分布,可以更好地发挥高温超导块材的悬浮性能潜力

Effect of Vertical Magnetic Field Variation on Levitation Force Characteristics of High Temperature Superconducting Bulk

Due to the unique flux pinning characteristic and the advantages of the integration of levitation/guidance and passive self-stabilization, high temperature superconducting (HTS) material have attracted the attention of many scholars. At present, the researches on the levitation performance of HTS bulks mainly focused on the low magnetic field environment generated by permanent magnets. In this paper, based on the strong magnetic field environment provided by a superconducting magnet platform, the relationship between the levitation force of the HTS bulk and the variation of the vertical magnetic field was experimentally studied by changing the different field cooling heights of the HTS bulk. The results show that the increment of levitation force decreases with the increase of vertical magnetic field variation, and finally the phenomenon of levitation force saturation appears. Moreover, the levitation performance of two kinds of HTS bulks with different materials, YBCO and GdBCO, were compared, and it was found that GdBCO bulk exhibited greater potential in levitation force performance in strong magnetic field environment. This lays a foundation for the application of HTS maglev in strong magnetic field. By adjusting the distribution of magnetic field more reasonably, the levitation potential of HTS bulk can be better exploited.