Research on Effect of Ferromagnetic Material on the Critical Current of Bi-2223 Tape

Yi WU  Mingzhe RONG  Jian LI  Xiaohua WANG  

IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.8   pp.1222-1227
Publication Date: 2008/08/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.8.1222
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices(Selected Papers from IS-EMD2007))
Category: Contact Phenomena
Bi-2223 tape,  high-temperature superconductor,  critical current,  ferromagnetic,  

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In this paper we mainly focus on the effect of a ferromagnetic material on the critical current of Bi-2223 tape. The magnetic field distributions of tapes with several different layouts of a ferromagnetic material are investigated by calculation and the corresponding critical current is tested experimentally. The analysis indicates that the critical current of the tape can be improved effectively by laying the ferromagnetic material perpendicularly next to the tape edge. Furthermore, various other ferromagnetic parameters are also important for reducing the magnetic field induced by the current flowing through the tape.