A Case Study of a Bulk Magnet Using High-Tc Superconductors

Kamijo, H.; Nemoto, Kaoru; Fujimoto, Hiroyuki

doi:10.1007/978-4-431-68473-2_191

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…It is well known that one of the most promising applications is a superconducting magnet for magnetically levitated (Maglev) trains. SCMs for Maglev trains applying high-Tc superconductors would be a prospective design in the future [16][17][18][19] , as are current leads to supply power to the superconducting magnet 20) . Recent achievements include the high-temperature superconducting coil using Bi wires in a persistent current mode 21) .…”

Section: Electric Power T Electric Power T Electric Power T Electric mentioning

confidence: 99%

Railway Applications for High-Tc Superconductors

Fujimoto

2004

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Section: Electric Power T Electric Power T Electric Power T Electric mentioning

confidence: 99%

Railway Applications for High-Tc Superconductors

Fujimoto

2004

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“…4 illustrates a bulk magnet which consists of 8 x 4 bulks for a pole. The distribution and the magnitude of magnetic fields through the ground coils were calculated [7]-[SI. The gap between the surface of the bulk and the center ofthe ground coil takes approximately 150 mm for the levitatiodguidance coil. '…”

Section: Superconducting Bulk Magnetmentioning

confidence: 99%

Preliminary study of a superconducting bulk magnet for the Maglev train

Fujimoto

Kamijo

Higuchi

et al. 1999

IEEE Trans. Appl. Supercond.

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One of the prospective applications of high critical temperature superconductors is a superconducting magnet for the magnetically levitated (Maglev) train. Recent development shows that REBaCuO and LRE(light rareearth)BaCuO superconductors prepared by melt processes have a high critical current density at 77 K and high magnetic fields. LRE-B a-C U-0 bulk superconductors m elt-processed in a reduced oxygen atmosphere, named oxygen-controlledmelt-growth (OCMG) process are very promising for high field application as a superconducting permanent magnet with liquid nitrogen refrigeration. Compared to good quality melt-grown REB aCuO bulks, LREBaCuO bulks exhibit larger critical current densities in high magnetic fields and much improved irreversibility field at 77 K, implying that more effective flux pinning can be realized in a commercially feasible way. In this study, we discuss the possibility of a superconducting bulk magnet for a Maglev train. A preliminary design of the bulk magnet and also melt processing for REBaCuO and LREBaCuO bulk superconductors and their characteristic superconducting properties are presented.

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“…When the high-Tc superconductors are applied to the SCM, they can be cooled by liquid nitrogen and their stability will be improved. In using high-Tc superconductors for the SCM of the Maglev system, it is possible to use either a race-track superconducting coil made of high-Tc superconducting wires [4] or a bulkmagnet trapping magnetic flux within bulk superconductors [1], [2]. The bulkmagnet is a characteristic application of high-Tc superconductor.…”

Section: Introductionmentioning

confidence: 99%

“…The bulkmagnet must also generate a high magnetic field and have a large pole. Therefore, The bulkmagnet should be composed of several bulk superconductors arranged in rows and columns, because the size of the bulk superconductor is smaller than that of the poles of Manuscript the Maglev system when it is made of melt-processed YBaCuO and NdBaCuO with a high critical current density at 77 K and a high magnetic filed [1], [2]. In this study, we fabricate a 198 mm 99 mm bulkmagnet, which consists of YBaCuO bulk superconductors that are 33 mm 33 mm in size and 10 mm in thickness in six columns and three rows [8].…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and flux-trapping experiments of a 198 mm×99 mm bulkmagnet using YBCO superconductors

Kamijo

Fujimoto

2002

IEEE Trans. Appl. Supercond.

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We fabricate a 198 mm 99 mm bulkmagnet, which consists of YBaCuO bulk superconductors that are 33 mm 33 mm in size and 10 mm in thickness in six columns and three rows. Bulk superconductors in this configuration are packed in one or two layers. The bulkmagnet is magnetized by the field-cooling method. The external magnetic field applied to the bulk superconductors is almost uniform at 1.1 T-1.2 T. The bulk superconductors are cooled by liquid nitrogen. As a result of the magnetization, the bulkmagnet can attract clips and mine tools on the surface of the outer vessel like a permanent magnet. The magnetic field at 3 mm from the surface of the outer vessel is larger than 0.14 T in the case of two layers.

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A Case Study of a Bulk Magnet Using High-Tc Superconductors

Cited by 12 publications

References 2 publications

Railway Applications for High-Tc Superconductors

Railway Applications for High-Tc Superconductors

Preliminary study of a superconducting bulk magnet for the Maglev train

Fabrication and flux-trapping experiments of a 198 mm×99 mm bulkmagnet using YBCO superconductors

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