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EP 3 939 060 A2

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(88) Date of publication A3: 05.03.2020 (43) Date of publication: 19.01.2022 Bulletin 2022/03 (21) Application number: 19769050.6 (22) Date of filing: 29.08.2019

(51) International Patent Classification (IPC):  H01F 41/02(2006.01) H01F 7/20(2006.01) H01F 3/10(2006.01) (52) Cooperative Patent Classification (CPC): Y02E 10/72; H01F 3/10; H01F 41/0273; H01F 7/20 (86) International application number: PCT/EP2019/073123 (87) International publication number: WO 2019/219984 (21.11.2019 Gazette 2019/47)

(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 Designated Validation States: KH MA MD TN (30) Priority: 23.04.2019 CN 201910328872 (71) Applicant: Siemens Gamesa Renewable Energy A/S 7330 Brande (DK)	(72) Inventors: AZAR, Ziad Sheffield South Yorkshire S10 4ED (GB) HUANG, Qingfang Xiamen, 361028 (CN) THOUGAARD, Hans-Joergen 8600 Silkeborg (DK) TONG, Qingkun Xiamen, 361006 (CN) URDA, Adriana Cristina 2300 København S (DK) (74) Representative: Aspacher, Karl-Georg  Siemens Wind Power GmbH & Co. KG Postfach 22 16 34 80506 München 80506 München (DE)