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采用顶部熔融织构生长法制备的高温超导块材YBCO通常有5个生长区域.通过捕获磁通实验研究,人们发现高温超导块材内部生长区域及边界的捕获磁通能力不同,存在明显的各向异性.面向高温超导磁悬浮应用,本文比较研究了3块不同的高温超导块材YBCO组合在永磁轨道上方悬浮力弛豫特性.实验结果表明,无论场冷还是零场冷情况,块材籽晶生长线对齐排列方式的悬浮力衰减率均小于块材籽晶生长线错开排列方式的悬浮力衰减率,即前者的弛豫特性较好.并且在排列方式相同的情况下,场冷情况下的悬浮力衰减率小于零场冷情况下的悬浮力衰减率,场冷情况下的弛豫特性较好.因此,在未来的实际应用中可通过合理选择高温超导块材排列方式以及冷却方法,以达到提高磁悬浮系统弛豫特性的目的,从而提高磁悬浮系统的稳定性能.
The high temperature superconducting block YBCO prepared by the top fusion texture growth method usually has 5 growth zones. Through the experimental study of the magnetic flux trapping, it is found that the ability of trapping magnetic flux is different between the inner growth zone and the boundary of the HTS bulk, .For high temperature superconducting magnetic suspension applications, this paper comparatively studied the relaxation characteristics of three different high temperature superconducting block YBCO combinations on the permanent magnet orbit. The experimental results show that no matter the field cold or zero field cold condition , The damping force of suspending force of the aligned alignment of block seed growth line is less than that of the staggered arrangement of the growth line of bulk seed, that is, the relaxation property of the former is better. And in the same arrangement, The damping rate of the levitation force under the field cold condition is less than that of the levitation force under the cold condition of zero field and the relaxation behavior is better under the field cold condition.Therefore, in the future practical application, Methods and cooling methods in order to achieve the purpose of improving the relaxation characteristics of the magnetic suspension system to improve the stability of the magnetic suspension system.