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1. (WO2018226100) WIND TURBINE GENERATOR WITH HYDRAULIC PUMP
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Claims

1. Wind turbine, comprising a tower and a head mounted at an upper end of said tower, rotational around a head axis, wherein a propeller is mounted to said head, rotatable around a propeller axis, wherein a hydraulic pump is provided, driven by said propeller, wherein the hydraulic pump is provided substantially in the propeller.

2. Wind turbine according to claim 1, wherein the head is provided with a nave, wherein a movable part of the pump rotates with the propeller at least partly around a part of said nave, wherein said nave forms or is provided with a substantially stationary part of the hydraulic pump, and wherein the propeller comprises a rotational part of the hydraulic pump.

3. Wind turbine according to claim 1 or 2, wherein said nave comprises a first part inside said head and a second part which is releasably connected to said first part, wherein said second part is provided in or by said hydraulic pump.

4. Wind turbine according to any one of claims 1 - 3, wherein a fluid circuit extends through the tower and the head, which fluid circuit comprises a part extending inside a hub of the propeller, which part comprises at least part of the hydraulic pump.

5. Wind turbine according to claim 4, wherein the fluid circuit comprises at least one valve provided in or near the head for disconnecting a fluid inlet channel of said circuit from the hydraulic pump, preferably further provided with at least a second valve in or near the head for disconnecting an outlet channel of said circuit from the hydraulic pump.

6. Wind turbine according to any one of the previous claims, wherein the pump is a multi piston pump, comprising a central part and a drive ring extending around the central part, wherein:

the central art comprises a series of radially outward facing cylinders with pistons movable in said cylinders in said radial direction, relative to a central axis, wherein drive ring engages the pistons directly or indirectly for at least forcing pistons radially inward; and/or

- the drive ring comprises a series of radially inward facing cylinders with pistons movable in said cylinders in said radial direction, relative to a central axis, wherein the central portion engages the pistons directly or indirectly for at least forcing pistons radially outward.

7. Wind turbine according to claim 6, wherein the drive ring comprises an inward facing, non-circular surface, engaging the pistons directly or indirectly.

8. Wind turbine according to claim 7, wherein between the inward facing surface of the drive ring and the pistons a flexible ring or ring assembly is provided, during use flexing for driving the pistons.

9. Wind turbine according to claim 7, wherein between the inward facing surface of the drive ring and each piston at least one bearing is provided, preferably at least two bearings carried by a bearing carrier or boogie, during use driving the pistons.

10. Wind turbine according to any one of the previous claims, wherein the pump is mounted to the head using a mounting provision also

supporting the propeller, wherein preferably the propeller comprises a hub with one or more blades connected to it, wherein the hub is mounted on at least one bracket which extends from the hub, which bracket is releasable connected to the head.

11. Wind turbine according to any one of the previous claims, wherein the propeller comprises a hub with one or more blades connected to it, wherein the hub is mounted on the housing by at least one gear and/or bearing, such that the hub can rotate relative to the head by said gear and/or bearing.

12. Wind turbine according to any one of the previous claims, wherein the pump comprises a non-circular drive for radially extending pistons and/or cylinders, directly or indirectly engaging said pistons and/or cylinders, whereas a traction and/or fiiction drive is provided, engaging said non-circular drive and a hub of the propeller, or a part engaging such hub, forming a gearing between the hub or at least the propeller and the non-circular drive.

13. Wind turbine according to any one of the previous claims, wherein a crane is mounted to the head or provided by the head, with which the propeller can be lifted from the head to a position near a foot of the tower or vice versa, wherein the crane is preferably provided on the head, especially on a top side of said head.

14. Wind turbine according to claim 13, wherein the crane is provided for lifting the propeller with at least part of the hydraulic pump, preferably the entire hydraulic pump.

15. Wind turbine according to any one of the previous claims, wherein the propeller with the hydraulic pump or at least a part thereof provided in or by the propeller is exchangeable for a replacement propeller with hydraulic pump or the relevant part thereof.

16. Wind turbine according to any one of the previous claims, wherein the hydraulic pump or the part thereof provided by or inside the propeller is accessible from within the head.

17. Wind turbine according to any one of the previous claims, wherein the hydraulic pump is connected to a generator, preferably through a hydraulic motor, more preferably through a Pelton type hydro turbine.

18. Wind turbine generator according to claim 17, wherein the generator is a multiple drive generator, wherein a first drive is provided by said pump and a second drive is provided by a further type drive, for example an incinerator type drive, such as for example a fossil fuel drive or an earth heat driven chive, tidal drive, solar powered drive or waste heat driven drive or the like.

19. Wind turbine according to any one of the previous claims, wherein the hydi'aulic pump is connected to a plant, such as an industrial, for example a desalination plant.

20. Pump for a wind turbine according to any one of the previous claims.

21. System for installation and/or maintenance of a wind turbine, especially a wind turbine according to any one of the previous claims, wherein the system comprises at least one vessel provided with a movable, preferably motion compensating platform suitable for carrying a propeller system of a wind turbine, wherein the platform is further suitable for transferring personnel to and from a wind mill to which the propeller system is to be mounted or from which the propeller system is to be retrieved.

22. Method for installing and/or maintenance of a wind turbine, wherein a tower with a head is placed in a selected position, and a propeller system is shipped to said tower, the propeller system including at least a substantial part of a hydraulic pump, wherein the propeller system is lifted to the head such that the hydi'aulic pump can be assembled in the wind turbine and/or can be connected to a hydi'aulic circuit extending through the tower and the head, wherein the propeller system is connected to the head.

23. Method according to claim 22, wherein a propeller system is first removed from the head and is then replaced by a replacement propeller system.

24. Method according to claim 22 or 23, wherein the or each propeller system is lifted using a crane provided on or by the wind turbine, especially a crane mounted on the head of the wind turbine.

25. Method for maintenance of a wind turbine farm, comprising a series of wind turbines, preferably according to any one of claims 1 - 21, wherein the series of turbines comprises N turbines, each turbine

comprising a propeller system, wherein at least one further propeller system is provided for exchange with any one of the N propeller systems, wherein for maintenance of a propeller system said propeller system is removed from the wind turbine and replaced by said further propeller system, wherein the propeller system removed may be shipped to a maintenance location remote from the relevant wind turbine or farm.