(19)

(11)

EP 2 850 624 A1

(12)

(43) Date of publication: 25.03.2015 Bulletin 2015/13 (21) Application number: 12721819.6 (22) Date of filing: 14.05.2012

(51) International Patent Classification (IPC):  H01F 27/04(2006.01) (86) International application number: PCT/EP2012/058884 (87) International publication number: WO 2013/170873 (21.11.2013 Gazette 2013/47)

(84) Designated Contracting States: AL 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 RS SE SI SK SM TR Designated Extension States: BA ME (71) Applicant: Siemens Aktiengesellschaft 80333 München (DE)	(72) Inventors: OLAH, Antal H-1213 Budapest (HU) SUKOSD, Zsolt H-1108 Budapest (HU) (74) Representative: Maier, Daniel Oliver  Siemens AG Postfach 22 16 34 80506 München 80506 München (DE)