空心圆柱形永磁体内径对单畴GdBCO超导块材磁悬浮力的影响  

Effect of inner diameter of hollow cylindrical permanent magnet on levitation force of single domain GdBCO bulk superconductor

作　　者：马俊 陈章龙 县涛 魏学刚 杨万民[2] 陈森林[2] 李佳伟[2] Ma Jun1） Chen Zhang-Long1） Xian Tao1） Wei Xue-Cang1） Yang Wan-Min2）t Chen Sen-Lin2） Li Jia-Wei2） 1）(College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China） 2） （College of Physics and Information Technology, Shanxi Normal University, Xi＇an 710062, China)

机构地区：[1]青海师范大学物理与电子信息工程学院,西宁810008 [2]陕西师范大学物理学与信息技术学院,西安710062

出　　处：《物理学报》2018年第7期227-233,共7页Acta Physica Sinica

基　　金：青海省自然科学基金(批准号:2016-ZJ-915);国家自然科学基金(批准号:51167016;51342001);青海省135高层次人才资助;中央高校基本科研业务费专项资金(批准号:GK201305014)资助的课题~~

摘　　要：通过对空心圆柱形永磁体与单畴GdBCO超导体磁悬浮力的实验测量,研究了空心圆柱形永磁体内径(d)的变化对超导体磁悬浮力的影响.结果发现,当空心圆柱形永磁体内径从0 mm增加到26 mm时,超导磁悬浮力大小与空心圆柱形永磁体内径有着密切关系(最小测量间距Z=2 mm),所有超导磁悬浮力曲线都存在磁滞现象.随着空心圆柱形永磁体内径的增大,最小间距处超导磁悬浮力逐渐减小,从d=0 mm时的14.8 N减小为d=26 mm时的-0.1 N,d≥20 mm时,最小间距处超导磁悬浮力出现负值;当0 mm≤d<5 mm时,超导体最大磁悬浮力出现在最小间距处,d≥5 mm时,超导磁悬浮力先增大后减小,最大超导磁悬浮力产生的位置随着内径的增大而变大.研究表明:只有科学合理地设计永磁体结构参数,才能获得较大的磁场强度,提高超导磁悬浮力特性.该结果对设计并优化磁悬浮轴承系统、环形轨道和超导体的实际应用具有一定的指导意义.The influence of inner diameter of hollow cylindrical permanent magnet on the levitation force of single domain GdBCO bulk superconductor is investigated by measuring the levitation force between the hollow cylindrical permanent magnet and the single domain GdBCO bulk superconductor. The results show that the levitation force is closely related to the inner diameter of the hollow cylindrical permanent magnet when the inner diameter （d） increases from 0 mm to 26 mm （minimum measuring gap distance Z = 2 mm）, and all the superconducting magnetic levitation force curve shows magnetic hysteresis phenomenon. With the increase of the inner diameter of the hollow cylindrical permanent magnet, the levitation force at a minimum distance decreases gradually from 14.8 N at d -- 0 mm to -0.1 N at d ----- 26 mm. The levitation force at the minimum gap distance is negative when d ~ 20 mm. When 0 mm ~ d 〈 5 mm, the location of maximum magnetic levitation force of the superconductor is at the minimum spacing. But the levitation force first increases and then decreases when d ≥ 5 mm. The larger magnetic field strength of the superconductor can be obtained, and the levitation force can be effectively improved by the scientific and reasonable designing of the permanent magnet structure. The results have certain guiding significance for designing and optimizing the magnetic suspension bearing system, ring track and superconductor.

关 键 词：单畴GdBCO超导体 空心圆柱形永磁体 磁悬浮力 

分 类 号：O511.3[一般工业技术—材料科学与工程]