(19)

(11)

EP 3 371 817 A1

(12)

(43) Date of publication: 12.09.2018 Bulletin 2018/37 (21) Application number: 16804898.1 (22) Date of filing: 04.11.2016

(51) International Patent Classification (IPC):  H01F 38/30(2006.01) (86) International application number: PCT/IB2016/001583 (87) International publication number: WO 2017/077379 (11.05.2017 Gazette 2017/19)

(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 Designated Validation States: MA MD (30) Priority: 05.11.2015 SE 1500444 (71) Applicant: HM Power AB 721 30 Västerås (SE)	(72) Inventor: MORITZ, Bertil 723 48 Västerås (SE)