A novel heat engine for magnetizing superconductors

作者：Coombs T A^*; Hong Z; Zhu X; Krabbes G

来源：Superconductor Science and Technology, 2008, 21(3): 034001.

DOI：10.1088/0953-2048/21/3/034001

The potential of bulk melt-processed YBCO single domains to trap significant magnetic fields (Tomita and Murakami 2003 Nature 421 517-20; Fuchs et al 2000 Appl. Phys. Lett. 76 2107-9) at cryogenic temperatures makes them particularly attractive for a variety of engineering applications including superconducting magnets, magnetic bearings and motors ( Coombs et al 1999 IEEE Trans. Appl. Supercond. 9 968-71; Coombs et al 2005 IEEE Trans. Appl. Supercond. 15 2312-5). It has already been shown that large fields can be obtained in single domain samples at 77 K. A range of possible applications exist in the design of high power density electric motors (Jiang et al 2006 Supercond. Sci. Technol. 19 1164-8). Before such devices can be created a major problem needs to be overcome. Even though all of these devices use a superconductor in the role of a permanent magnet and even though the superconductor can trap potentially huge magnetic fields ( greater than 10 T) the problem is how to induce the magnetic fields. There are four possible known methods: ( 1) cooling in field; ( 2) zero field cooling, followed by slowly applied field; ( 3) pulse magnetization; ( 4) flux pumping.

• 出版日期2008-3