高温超导体在对称和不对称外磁场中的悬浮力计算

在理想无限长直高温超导 -永磁导轨系统中 ,由于导轨磁场分布的不均匀性 ,超导体运动过程中所处外磁场有对称及不对称分布两种情况。原 Prigozhin模型假设超导体各向同性 ,但 YBCO高温超导体存在明显的各向异性。改进Prigozhin模型增加了原模型中的约束条件 ,考虑了这种各向异性。在对称外磁场中改进 Prigozhin模型的计算结果和原Prizhogin模型相同 ,因为原模型在对称外磁场中自然满足超导体各向异性。在不对称外磁场中计算结果和实验结果吻合较好 ,而原模型计算结果和实验结果差别较大。所以改进模型考虑了各向异性 ,适用于对称和不对称外磁场 ,能得到更准确的计算结果。

Levitation Force Calculation of YBCO High Temperature Superconductor in Symmetrical and Asymmetrical Magnetic Field

In infinitely long high temperature superconductor and permanent magnetic guideway system, the magnetic field created by a permanent magnet guideway is inhomogeneous, for the moving superconductor the applied field has two cases: symmetrical or asymmetrical about its symmetry plane. In the symmetrical applied field the calculated results of the original and modified Prigozhin model are the same, because the original model has satisfied the current anisotropy in the symmetrical field. However, in the asymmetrical applied field the calculated results of the modified model agree well with the experimental results, but there is much difference between the calculated results of the original model and those from experiments. In short, the modified model has considered the anisotropy and its calculated results are more accurate.