(19)

(11)

EP 4 143 436 A1

(12)

(43) Date of publication: 08.03.2023 Bulletin 2023/10 (21) Application number: 21724190.0 (22) Date of filing: 28.04.2021

(51) International Patent Classification (IPC):  F03D 13/40(2016.01) F03D 1/06(2006.01) F03D 13/10(2016.01) (52) Cooperative Patent Classification (CPC): F03D 13/40; F03D 13/10; F03D 1/0658; F05B 2260/30; F05B 2230/604; Y02P 70/50; Y02E 10/72 (86) International application number: PCT/DK2021/050131 (87) International publication number: WO 2021/219185 (04.11.2021 Gazette 2021/44)

(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: 28.04.2020 EP 20171860 (71) Applicant: VESTAS WIND SYSTEMS A/S 8200 Aarhus N (DK)	(72) Inventor: BOTWRIGHT, Adrian 8200 Aarhus N (DK) (74) Representative: Vestas Patents Department  Hedeager 42 8200 Aarhus N 8200 Aarhus N (DK)