抄録
We have fabricated the stator of a superconducting bearing module for a 10 kWh class flywheel system. The bearing is of radial type in that YBCO bulks are installed in the inner stator and ring-shaped permanent magnets in the outer rotor. YBCO bulk superconductors have a Japanese roof tile shape with epoxy resin impregnation for reinforcement and surface protection. The inner stator is a cylinder (OD = 123 mm, ID = 93 mm, height = 60 mm) that consists of eight YBCO blocks. The c-axis of the YBCO blocks was parallel to the radial direction of the cylinder. The cylindrical set of the YBCO bulks was fixed in a cryostat with epoxy resin. Before installment, we measured the trapped magnetic field distribution of the individual YBCO bulks by using Hall probes at 77 K after field-cooled in the presence of 1 T. The peak field values ranged from 0.4 to 0.7 T. For some samples, the field distribution was not symmetrical, suggesting the presence of some cracks or defects. We also measured the repulsive force between the YBCO bulk at 77 K and a permanent magnet using a tensile machine with a permanent magnet 25 mm in diameter and 5 mm in thickness having surface induction of 0.3 T. Unlike the trapped field, the repulsive force was almost constant for all the samples and was about 50 N at a 0.5 mm gap.
| 元の言語 | English |
|---|---|
| ページ（範囲） | 842-845 |
| ページ数 | 4 |
| ジャーナル | Superconductor Science and Technology |
| 巻 | 15 |
| 発行部数 | 5 |
| DOI | |
| 出版物ステータス | Published - 2002 5 |
| 外部発表 | Yes |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
これを引用
YBCO bulk of the superconducting bearing for a 10 kWh flywheel. / Matsunaga, Koji; Tomita, Masaru; Yamachi, Nobuhiko; Iida, Kazumasa; Yoshioka, Junko; Murakami, Masato.
：: Superconductor Science and Technology, 巻 15, 番号 5, 05.2002, p. 842-845.研究成果: Article
}
TY - JOUR
T1 - YBCO bulk of the superconducting bearing for a 10 kWh flywheel
AU - Matsunaga, Koji
AU - Tomita, Masaru
AU - Yamachi, Nobuhiko
AU - Iida, Kazumasa
AU - Yoshioka, Junko
AU - Murakami, Masato
PY - 2002/5
Y1 - 2002/5
N2 - We have fabricated the stator of a superconducting bearing module for a 10 kWh class flywheel system. The bearing is of radial type in that YBCO bulks are installed in the inner stator and ring-shaped permanent magnets in the outer rotor. YBCO bulk superconductors have a Japanese roof tile shape with epoxy resin impregnation for reinforcement and surface protection. The inner stator is a cylinder (OD = 123 mm, ID = 93 mm, height = 60 mm) that consists of eight YBCO blocks. The c-axis of the YBCO blocks was parallel to the radial direction of the cylinder. The cylindrical set of the YBCO bulks was fixed in a cryostat with epoxy resin. Before installment, we measured the trapped magnetic field distribution of the individual YBCO bulks by using Hall probes at 77 K after field-cooled in the presence of 1 T. The peak field values ranged from 0.4 to 0.7 T. For some samples, the field distribution was not symmetrical, suggesting the presence of some cracks or defects. We also measured the repulsive force between the YBCO bulk at 77 K and a permanent magnet using a tensile machine with a permanent magnet 25 mm in diameter and 5 mm in thickness having surface induction of 0.3 T. Unlike the trapped field, the repulsive force was almost constant for all the samples and was about 50 N at a 0.5 mm gap.
AB - We have fabricated the stator of a superconducting bearing module for a 10 kWh class flywheel system. The bearing is of radial type in that YBCO bulks are installed in the inner stator and ring-shaped permanent magnets in the outer rotor. YBCO bulk superconductors have a Japanese roof tile shape with epoxy resin impregnation for reinforcement and surface protection. The inner stator is a cylinder (OD = 123 mm, ID = 93 mm, height = 60 mm) that consists of eight YBCO blocks. The c-axis of the YBCO blocks was parallel to the radial direction of the cylinder. The cylindrical set of the YBCO bulks was fixed in a cryostat with epoxy resin. Before installment, we measured the trapped magnetic field distribution of the individual YBCO bulks by using Hall probes at 77 K after field-cooled in the presence of 1 T. The peak field values ranged from 0.4 to 0.7 T. For some samples, the field distribution was not symmetrical, suggesting the presence of some cracks or defects. We also measured the repulsive force between the YBCO bulk at 77 K and a permanent magnet using a tensile machine with a permanent magnet 25 mm in diameter and 5 mm in thickness having surface induction of 0.3 T. Unlike the trapped field, the repulsive force was almost constant for all the samples and was about 50 N at a 0.5 mm gap.
UR - http://www.scopus.com/inward/record.url?scp=0036566778&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036566778&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/15/5/341
DO - 10.1088/0953-2048/15/5/341
M3 - Article
AN - SCOPUS:0036566778
VL - 15
SP - 842
EP - 845
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 5
ER -