Large-scale HTS bulks for magnetic application
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- 作者：Frank N. Werfel ; werfel@t-online.de ; Uta Floegel-Delor ; Thomas Riedel ; Bernd Goebel ; Rolf Rothfeld ; Peter Schirrmeister ; Dieter Wippich
- 关键词：Bulk superconductors ; Trapped field ; Magnetic bearings ; Maglev ; Mobile application
- 刊名：Physica C
- 出版年：2013
- 出版时间：15 January, 2013
- 年：2013
- 卷：484
- 期：Complete
- 页码：6-11
- 全文大小：916 K
文摘
ATZ Company has constructed about 130 HTS magnet systems using high-Tc bulk magnets. A key feature in scaling-up is the fabrication of YBCO melts textured multi-seeded large bulks with three to eight seeds. Except of levitation, magnetization, trapped field and hysteresis, we review system engineering parameters of HTS magnetic linear and rotational bearings like compactness, cryogenics, power density, efficiency and robust construction. We examine mobile compact YBCO bulk magnet platforms cooled with LN2 and Stirling cryo-cooler for demonstrator use. Compact cryostats for Maglev train operation contain 24 pieces of 3-seed bulks and can levitate 2500-3000 N at 10 mm above a permanent magnet (PM) track. The effective magnetic distance of the thermally insulated bulks is 2 mm only; the stored 2.5 l LN2 allows more than 24 h operation without refilling. 34 HTS Maglev vacuum cryostats are manufactured tested and operate in Germany, China and Brazil. The magnetic levitation load to weight ratio is more than 15, and by group assembling the HTS cryostats under vehicles up to 5 t total loads levitated above a magnetic track is achieved.