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By measuring the levitation forces between a single domain GdBCO bulk superconductor and assembled bar magnets(ABM) in different configurations at liquid nitrogen temperature, the effects of ABM configurations on the levitation force of single domain GdBCO bulk superconductor are investigated. The maximum levitation force is obtained at the same vertical gap distance Z=5 mm between the superconductor and the ABM for configurations with different lateral gap distance(D)between the magnets of the ABM. It is found that 1) for the ABM consisting of 3 bar magnet, the levitation force of the GdBCO bulk decreases from 22.8N to 9.7N with the D value increasing from 0 to 30 mm, when the magnetic pole N of the middle magnet is pointed upwards and the directions of magnetic pole N of two side magnets are pointed to the middle magnet in horizontal direction; the levitation force of the GdBCO bulk increases first from 9.2N to 13.9N and then decreases to10.4 N with D value increasing from 0 to 30mm, if the magnetic pole N of the middle magnet is pointed upwards and the directions of magnetic pole N of two side magnets are pointed downwards;2)for the ABM consisting of 2 bar magnets, the levitation force of the GdBCO bulk decreases from 11.2N to 1.2N with D value increasing from 0 to 30mm, when the directions of magnetic pole N of two side magnets are pointed upwards; the levitation force of the GdBCO bulk increases first from 6.0N to 6.8N and then decreases to 2.9N with D value increasing from 0 to 30mm, if the directions of magnetic pole N of two magnets are anti-parallel in horizontal direction; 3)for the ABM consisting of only 1 bar magnets, D≡0, and the levitation force of the GdBCO bulk is about 9.5N. The results indicate that the magnet configuration and its detailed parameters of ABM are very important for improving the levitation force of a superconductor and helpful for designing and application based on the superconducting magnetic levitation system.
[1] John R H, Shaul H,Tomotake M 2005 Supercond Sci. Technol. 18 S1
[2] Miyagawa Y, Kameno H, Takahata R 1999 IEEE Trans Appl. Supercond 9 996
[3] Nuria D V, Alvaro S,Carles N 2008 Appl.Phys.Lett. 92 042505
[4] Wang J S,Wang S Y 2002 Physica C 378-381 809
[5] Sha J J, Yao Z W 2000 Acta Phys.Sin. 49 1356 ( in Chinese)[沙建军、姚仲文 2000 49 1356]
[6] Feng Y, Zhou L,Yang W M,Zhang C P 2000 Acta Phys.Sin. 49 146 ( in Chinese) [冯 勇、周 廉、杨万民、张翠萍 2000 49 146]
[7] Yang W M,Zhou L,Feng Y 1999 Acta Phys.Sin. 48 0533 (in Chinese)[杨万民 1999 48 533]
[8] Zhu M,Ren Zh Y,Wang S Y 2002 Chinese Journal of Low Temperature Physics 24 213(in Chinese) 玉 2002 低温 24 213]
[9] Carles N,Alvaro S 2001 Phys.Rev.B 64 214507
[10] Zhang F Y,Huang S L,Cao X W 1989 Acta Phys.Sin. 39 830 ( in Chinese)[张凤英、黄孙利、曹效文 1989 39 830]
[11] Alvaro S,Carles N 2001 Phys.Rev.B 64 214506
[12] Nuria D V, Alvaro S,Enric P 2007 Appl. Phys.Lett. 90 042503
[13] Yang W M,Zhou L,Feng Y 2001 Physica C 354 5
[14] Ma J, Yang W M, Li G Z, Cheng X F, Guo X D 2011 Acta Phys.Sin. 60 027401 (in Chinese) [马 俊、杨万民、李国政、程晓芳、郭晓丹 2011 60 027401]
[15] Li G Z,Yang W M 2010 Acta Phys.Sin. 59 5028 (in Chinese) [李国政、杨万民 2010 59 5028]
[16] Yang W M, Chao X X, Shu Z B 2006 Physica C 445-448 347
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[1] John R H, Shaul H,Tomotake M 2005 Supercond Sci. Technol. 18 S1
[2] Miyagawa Y, Kameno H, Takahata R 1999 IEEE Trans Appl. Supercond 9 996
[3] Nuria D V, Alvaro S,Carles N 2008 Appl.Phys.Lett. 92 042505
[4] Wang J S,Wang S Y 2002 Physica C 378-381 809
[5] Sha J J, Yao Z W 2000 Acta Phys.Sin. 49 1356 ( in Chinese)[沙建军、姚仲文 2000 49 1356]
[6] Feng Y, Zhou L,Yang W M,Zhang C P 2000 Acta Phys.Sin. 49 146 ( in Chinese) [冯 勇、周 廉、杨万民、张翠萍 2000 49 146]
[7] Yang W M,Zhou L,Feng Y 1999 Acta Phys.Sin. 48 0533 (in Chinese)[杨万民 1999 48 533]
[8] Zhu M,Ren Zh Y,Wang S Y 2002 Chinese Journal of Low Temperature Physics 24 213(in Chinese) 玉 2002 低温 24 213]
[9] Carles N,Alvaro S 2001 Phys.Rev.B 64 214507
[10] Zhang F Y,Huang S L,Cao X W 1989 Acta Phys.Sin. 39 830 ( in Chinese)[张凤英、黄孙利、曹效文 1989 39 830]
[11] Alvaro S,Carles N 2001 Phys.Rev.B 64 214506
[12] Nuria D V, Alvaro S,Enric P 2007 Appl. Phys.Lett. 90 042503
[13] Yang W M,Zhou L,Feng Y 2001 Physica C 354 5
[14] Ma J, Yang W M, Li G Z, Cheng X F, Guo X D 2011 Acta Phys.Sin. 60 027401 (in Chinese) [马 俊、杨万民、李国政、程晓芳、郭晓丹 2011 60 027401]
[15] Li G Z,Yang W M 2010 Acta Phys.Sin. 59 5028 (in Chinese) [李国政、杨万民 2010 59 5028]
[16] Yang W M, Chao X X, Shu Z B 2006 Physica C 445-448 347
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