(19)

(11)

EP 4 115 080 A1

(12)

(43) Date of publication: 11.01.2023 Bulletin 2023/02 (21) Application number: 21710401.7 (22) Date of filing: 02.03.2021

(51) International Patent Classification (IPC):  F03D 13/10(2016.01) F03D 1/06(2006.01) (52) Cooperative Patent Classification (CPC): F03D 13/10; F03D 1/0658; F05B 2230/61; F05B 2240/916; Y02E 10/728 (86) International application number: PCT/DK2021/050064 (87) International publication number: WO 2021/175399 (10.09.2021 Gazette 2021/36)

(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: 04.03.2020 EP 20161006 (71) Applicant: VESTAS WIND SYSTEMS A/S 8200 Aarhus N (DK)	(72) Inventor: BOTWRIGHT, Adrian 8471 Sabro (DK) (74) Representative: Vestas Patents Department  Hedeager 42 8200 Aarhus N 8200 Aarhus N (DK)