(19)

(11)

EP 2 265 871 A2

(12)

(88) Date of publication A3: 21.01.2010 (43) Date of publication: 29.12.2010 Bulletin 2010/52 (21) Application number: 09739371.4 (22) Date of filing: 31.03.2009

(51) International Patent Classification (IPC):  F25D 19/00(2006.01) H01F 6/04(2006.01) (86) International application number: PCT/US2009/038949 (87) International publication number: WO 2009/134569 (05.11.2009 Gazette 2009/45)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA RS (30) Priority: 31.03.2008 US 59951 (71) Applicant: American Superconductor Corporation Devens, MA 01434 (US)	(72) Inventors: YUAN, Jie South Grafton MA 01560 (US) MAGUIRE, James Andover MA 01810 (US) (74) Representative: Schütte, Gearoid et al Cruickshank & Company 8A Sandyford Business Centre Sandyford Dublin 18 Dublin 18 (IE)