WO2002079647A1 - Hub for a turbine and a wind power plant comprising such a hub - Google Patents

Hub for a turbine and a wind power plant comprising such a hub Download PDF

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Publication number
WO2002079647A1
WO2002079647A1 PCT/SE2002/000620 SE0200620W WO02079647A1 WO 2002079647 A1 WO2002079647 A1 WO 2002079647A1 SE 0200620 W SE0200620 W SE 0200620W WO 02079647 A1 WO02079647 A1 WO 02079647A1
Authority
WO
WIPO (PCT)
Prior art keywords
hub
turbine
bearing
wind turbine
periphery
Prior art date
Application number
PCT/SE2002/000620
Other languages
French (fr)
Inventor
Staffan ENGSTRÖM
Original Assignee
Nordic Windpower Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nordic Windpower Ab filed Critical Nordic Windpower Ab
Publication of WO2002079647A1 publication Critical patent/WO2002079647A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05B2260/74—Adjusting of angle of incidence or attack of rotating blades by turning around an axis perpendicular the rotor centre line
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • Hub for a turbine and a wind power plant comprising such a hub
  • the invention relates to a hub for a turbine, in particular to a wind turbine for a wind turbine generator, said hub being the holder for at least one turbine blade and being connected to a rotatable turbine shaft by means of a hinge member.
  • the hinge member admits a limited movement of the hub relatively to the shaft and includes one bearing and a flexible stop for the movement.
  • the invention also relates to a wind turbine generator with a wind turbine furnished with such a hub.
  • wind turbine generators have rigid hubs, which means that the blades of the wind turbine have a rigid connection with the hub.
  • a reduction of the number of blades to two is desirable, since this means a considerable reduction of the blade cost as well as other advantages, such as a less complicated assembly.
  • the yearly energy yield for the two-bladed turbine, calculated for a certain turbine diameter, is only reduced with 2-3%.
  • a two-bladed, rigid hub wind turbine is exposed to considerable unbalance forces even during normal operation causing fatigue in the components of the turbine.
  • the object of the present invention is to provide a hub for a turbine which may endure the extreme load cases at especially demanding wind conditions without requiring a strengthening of the structure by increased dimensioning.
  • This object is achieved in accordance with the invention in a teetered hub in which the extreme moments are absorbed in a way that the forces that are created by the extreme moments are made as small as possible.
  • the hub according to the invention is designed to make the reaction arms as long as possible and since the moment is equal to the reaction arm times the force, the forces are minimised.
  • the moments of the teeter hinge in a teetered hub are absorbed by a pair of forces, one of which is acting in the teeter hinge and the other of which is acting in the teeter stop, respectively.
  • the distance between the elements must be maximised. According to the invention, this is accomplished by positioning these elements in the teetered hub adjacent the opposite sides of the periphery of the hub.
  • a structure according to the invention relatively small forces are acting in the elements of the hub.
  • the structure may thus be manufactured without increasing the dimensions of the structure.
  • the structure according to the invention can be made with a relatively low weight and at a cost which enables a favourable operating economy.
  • Figure 1 shows the principal structure of a wind turbine generator with a horizontal axis wind turbine
  • Figure 1 shows the general structure of a wind turbine generator with a horizontal axis wind turbine.
  • Two aerodynamically shaped turbine blades ( 1) are connected to the hub (2) with a fixed or pivotal (along the longitudinal axis) connection.
  • the hub (2) is connected to the turbine shaft (3), which is supported by the bearings (4).
  • the turbine shaft (3) is connected to the gearbox (5), which transforms the low rotation speed of the turbine to a rotation speed conformable to the generator (6).
  • the components of the machinery are supported by the machinery bed (7), which is connected to the yaw bearing (8).
  • the yaw bearing (8) is rotatable on the tower (10) by means of the yaw mechanism (9).
  • the tower is connected to solid ground by a foundation (not shown) .
  • the various functions may be more or less integrated with each other, which however does not affect the following description.
  • the hub (2) is a teetered hub, which implies that the two turbine blades ( 1) are rigidly connected to the hub (2).
  • the hub (2) is hinged to the turbine shaft (3) and may teeter an angle A, as shown, in each direction.
  • the number of blades is normally two, but in a preferred embodiment the structure principle is applied to a turbine with one blade, and with the missing blade compensated by a counter weight.
  • FIGS 2A and 2B show a teeter hub according to the invention.
  • the blades (1) are connected to the hub (2), which normally is a cast structure and is connected to the turbine shaft (3) by means of a hinge member.
  • the hinge includes a bearing ( 12), which normally is composed of two or four symmetrically disposed bearing elements.
  • the hub (2) may pivot the angle as shown in either direction towards a flexible teeter stop.
  • the flexible teeter stop includes spring elements ( 13) interacting with a reaction arm (15).
  • the reaction arm (15) is disposed in the hub and extends from one side of the periphery of the hub adjacent the turbine shaft (3), through the entire hub and to the opposite side of the periphery of the hub.
  • the reaction arm (15) may be formed as an extension of the turbine shaft (3), which may be practical due to aspects of manufacturing and structural strength, or as a separate component which is fixed to the turbine shaft (3).
  • the reaction arm (15) extends to and through a spring seat (17), which is disposed in the structure of the hub.
  • Spring elements (13) are disposed in the spring seat ( 17) such that they bear on and surround the reaction arm (15) in the pivoting direction of the hub.
  • the spring elements (13) counteract the teeter movement and may be combined with dampers, either by selecting a spring material with some damping properties, or by providing dampers of some other kind (not shown).
  • the active parts of both the bearing (12) and the springs ( 13) are preferably made of elastomeric material.
  • the bearing ( 12), the reaction arm ( 15) and the spring elements ( 13) together form a hinge element, having a certain rigidity in relation to the axis of the hinge and thus of the bearing.
  • the reaction forces from gravitation and from moments in relation to the hinge are absorbed with an essentially even distribution on the bearing (12) and the springs (13).
  • the reaction forces act at a mutual distance which is as large as the size of the hub permits, such that the reaction forces are minimised.
  • the bearing (12) and the spring elements ( 13) of the flexible stop are disposed at opposite sides of the periphery of the hub (2), adjacent its lee- and windward sides, respectively. This is the condition for a wind turbine disposed on the windward side of the tower. However, for a turbine on the leeward side of the tower, the opposite condition prevails.
  • reaction forces between hub and shaft are acting directly on the shaft (3), or on its extension, and on the hub (2), respectively. This implies a simple and cost-effective construction.
  • the hub according to the invention may form an essentially spherical shell structure, which effectively makes use of the material and also advantageously connect the blade flanges to the outer surface of the hub. This reduces the stress concentrations and thus additionally saves material.
  • the blade flanges become accessible from the interior of the hub, which eliminates the need for outer balconies or similar arrangements which otherwise are needed in order to get a safe access to inspect and post-tension the screws which hold the blades.
  • the spherical basic shape of the hub thus constitutes a preferred embodiment.
  • the invention and the preferred embodiments of the invention as described imply essential technical and economical advantages when applied on one- and two-bladed wind turbine generators in particular.
  • Preferred embodiments as described above illustrates how the invention may be applied on wind turbines with one or two blades.
  • the skilled man may easily apply the invention on wind turbines with several blades and on neighbouring application areas, such as propellers for airplanes and ships, fans, turbines for other gaseous or liquideous working media, etc.

Abstract

The present invention relates to a hub for a turbine, in particular a wind turbine for a wind turbine generator. The hub (2) is the holder for at least one turbine blade (1) and is connected to a rotatable turbine shaft (3) through a hinge member, which permits a limited movement of the hub in relation to the turbine shaft (3) and comprises a bearing (12) and a flexible teeter stop (13, 15). The flexible teeter stop (13, 15) comprises spring elements (13) which interact with a reaction arm (15) extending from said turbine shaft (3). The spring elements (13) and the bearing (12), respectively, are disposed in the hub (2) adjacent opposite sides of the periphery of the hub. The invention also relates to a wind turbine generator with such a hub.

Description

Hub for a turbine and a wind power plant comprising such a hub
Field of the invention
The invention relates to a hub for a turbine, in particular to a wind turbine for a wind turbine generator, said hub being the holder for at least one turbine blade and being connected to a rotatable turbine shaft by means of a hinge member. The hinge member admits a limited movement of the hub relatively to the shaft and includes one bearing and a flexible stop for the movement. The invention also relates to a wind turbine generator with a wind turbine furnished with such a hub.
Background of the invention
Conventionally, wind turbine generators have rigid hubs, which means that the blades of the wind turbine have a rigid connection with the hub. The function in acceptable when the number of blades is at least three, since three symmetrically arranged blades, to a certain ex- tent, are capable of levelling out the un-balance forces that are created due to irregularities in the wind field. A reduction of the number of blades to two is desirable, since this means a considerable reduction of the blade cost as well as other advantages, such as a less complicated assembly. The yearly energy yield for the two-bladed turbine, calculated for a certain turbine diameter, is only reduced with 2-3%. However, a two-bladed, rigid hub wind turbine is exposed to considerable unbalance forces even during normal operation causing fatigue in the components of the turbine. This must be compensated by increased dimensions of all the main components, such that this two-bladed solu- tion, due to the excessive cost, is no longer justified. As a consequence, this type of wind turbine is no longer manufactured. The teetered hub became the solution of the problems of the two- bladed, rigid hub wind turbine. It is characterised by the two blades being rigidly fixed to a hub, which is hinged to the turbine shaft. US Patent No 4,565,929 discloses an example of a turbine, which is able to teeter ±7° until making contact with the teeter stops. The function is satisfactory during normal conditions, which means that the fatigue behaviour is advantageous. However, during extreme wind conditions with high turbulence and wind shear, such contacts with the teeter stops may occur that result in more severe moments than in a rigid hub wind turbine. Thus, it is the extreme load cases that are critical.
This type of hub has not reached any widespread use, which may be due to an unsuitable design. Part of the problems of the disclosed conventional teetered hub is that the design is unsuitable to handle extreme moments which occasionally occur and which create very large forces in the structure.
Basic idea of the invention
The object of the present invention is to provide a hub for a turbine which may endure the extreme load cases at especially demanding wind conditions without requiring a strengthening of the structure by increased dimensioning.
This object is achieved in accordance with the invention in a teetered hub in which the extreme moments are absorbed in a way that the forces that are created by the extreme moments are made as small as possible. The hub according to the invention is designed to make the reaction arms as long as possible and since the moment is equal to the reaction arm times the force, the forces are minimised.
The moments of the teeter hinge in a teetered hub are absorbed by a pair of forces, one of which is acting in the teeter hinge and the other of which is acting in the teeter stop, respectively. In order to minimise the forces in the above-mentioned elements, the distance between the elements must be maximised. According to the invention, this is accomplished by positioning these elements in the teetered hub adjacent the opposite sides of the periphery of the hub.
To summarise, in a structure according to the invention relatively small forces are acting in the elements of the hub. The structure may thus be manufactured without increasing the dimensions of the structure. Thus, the structure according to the invention can be made with a relatively low weight and at a cost which enables a favourable operating economy.
Short description of the drawings
The invention will be described more in detail below with reference to the appended drawings, in which
Figure 1 shows the principal structure of a wind turbine generator with a horizontal axis wind turbine, and
Figure 2A shows a side elevation, partly as a sectional view, of a hub according to an embodiment of the invention and Figure 2B shows the hub as shown in Figure 2 A in a front elevation view.
Detailed description of a preferred embodiment of the invention
Figure 1 shows the general structure of a wind turbine generator with a horizontal axis wind turbine. Two aerodynamically shaped turbine blades ( 1) are connected to the hub (2) with a fixed or pivotal (along the longitudinal axis) connection. The hub (2) is connected to the turbine shaft (3), which is supported by the bearings (4). The turbine shaft (3) is connected to the gearbox (5), which transforms the low rotation speed of the turbine to a rotation speed conformable to the generator (6). The components of the machinery are supported by the machinery bed (7), which is connected to the yaw bearing (8). The yaw bearing (8) is rotatable on the tower (10) by means of the yaw mechanism (9). The tower is connected to solid ground by a foundation (not shown) . The various functions may be more or less integrated with each other, which however does not affect the following description.
In Figure 1 is indicated that the hub (2) is a teetered hub, which implies that the two turbine blades ( 1) are rigidly connected to the hub (2). The hub (2) is hinged to the turbine shaft (3) and may teeter an angle A, as shown, in each direction.
The number of blades is normally two, but in a preferred embodiment the structure principle is applied to a turbine with one blade, and with the missing blade compensated by a counter weight.
Figures 2A and 2B show a teeter hub according to the invention. As above, the blades (1) are connected to the hub (2), which normally is a cast structure and is connected to the turbine shaft (3) by means of a hinge member. The hinge includes a bearing ( 12), which normally is composed of two or four symmetrically disposed bearing elements. The hub (2) may pivot the angle as shown in either direction towards a flexible teeter stop.
The flexible teeter stop includes spring elements ( 13) interacting with a reaction arm (15). The reaction arm (15) is disposed in the hub and extends from one side of the periphery of the hub adjacent the turbine shaft (3), through the entire hub and to the opposite side of the periphery of the hub. The reaction arm (15) may be formed as an extension of the turbine shaft (3), which may be practical due to aspects of manufacturing and structural strength, or as a separate component which is fixed to the turbine shaft (3). The reaction arm (15) extends to and through a spring seat (17), which is disposed in the structure of the hub. Spring elements (13) are disposed in the spring seat ( 17) such that they bear on and surround the reaction arm (15) in the pivoting direction of the hub. The spring elements (13) counteract the teeter movement and may be combined with dampers, either by selecting a spring material with some damping properties, or by providing dampers of some other kind (not shown). The active parts of both the bearing (12) and the springs ( 13) are preferably made of elastomeric material.
The bearing ( 12), the reaction arm ( 15) and the spring elements ( 13) together form a hinge element, having a certain rigidity in relation to the axis of the hinge and thus of the bearing.
In the described preferred embodiment, the reaction forces from gravitation and from moments in relation to the hinge are absorbed with an essentially even distribution on the bearing (12) and the springs (13). The reaction forces act at a mutual distance which is as large as the size of the hub permits, such that the reaction forces are minimised. This is possible since the bearing (12) and the spring elements ( 13) of the flexible stop are disposed at opposite sides of the periphery of the hub (2), adjacent its lee- and windward sides, respectively. This is the condition for a wind turbine disposed on the windward side of the tower. However, for a turbine on the leeward side of the tower, the opposite condition prevails.
According to a preferred embodiment, it is advantageous that the reaction forces between hub and shaft are acting directly on the shaft (3), or on its extension, and on the hub (2), respectively. This implies a simple and cost-effective construction.
An additional advantage is that the hub according to the invention may form an essentially spherical shell structure, which effectively makes use of the material and also advantageously connect the blade flanges to the outer surface of the hub. This reduces the stress concentrations and thus additionally saves material. In addition, the blade flanges become accessible from the interior of the hub, which eliminates the need for outer balconies or similar arrangements which otherwise are needed in order to get a safe access to inspect and post-tension the screws which hold the blades. The spherical basic shape of the hub thus constitutes a preferred embodiment. As described above, the invention and the preferred embodiments of the invention as described imply essential technical and economical advantages when applied on one- and two-bladed wind turbine generators in particular. Preferred embodiments as described above illustrates how the invention may be applied on wind turbines with one or two blades. However, the skilled man may easily apply the invention on wind turbines with several blades and on neighbouring application areas, such as propellers for airplanes and ships, fans, turbines for other gaseous or liquideous working media, etc.

Claims

Claims
1. A hub for a turbine, in particular a wind turbine for a wind turbine generator, said hub (2) being the holder for at least one turbine blade (1) and being connected to a rotatable turbine shaft (3) through a hinge member, which permits a limited movement of the hub in relation to the turbine shaft (3) and which comprises a bearing ( 12) and a flexible teeter stop (13, 15), characterised in that the flexible teeter stop (13, 15) comprises spring elements (13), which interact with a reaction arm ( 15) extending from said turbine shaft (3), and that said spring elements ( 13) and said bearing ( 12), respectively, are disposed in the hub (2) adjacent opposite sides of the periphery of the hub.
2. A hub according to claim 1, characterised in that said bearing (12) is disposed adjacent a section of the periphery of the hub which adjoins the turbine shaft (3) and that said spring elements (13) are disposed adjacent the opposite side of the periphery of the hub.
3. A hub according to claim 1 or 2, characterised in that the hub (2) is basically formed as a spherical shell.
4. A hub according to any one of the preceding claims, characterised in that said reaction arm (15) extends from the periphery of the hub at the connection of the turbine shaft (3) to the hub (2), through the entire hub and into a spring seat (17) disposed on the opposite side of the periphery of the hub, said reaction arm (15) being adapted to bear on said spring elements (13) in said spring seat (17) in the pivoting direction.
5. A hub according to any one of the preceding claims, characterised in that the reaction arm ( 15) is a part of the turbine shaft (3).
6. A hub according to any one of the preceding claims, characterised in that the spring seat (17) is disposed in the hub material.
7. A hub according to any one of the preceding claims, characterised in that the active parts of the bearing (12) and the spring elements ( 13) consist of elastomeric material.
8. A wind turbine generator comprising a wind turbine with a hub according to any one of the preceding claims.
PCT/SE2002/000620 2001-03-30 2002-03-28 Hub for a turbine and a wind power plant comprising such a hub WO2002079647A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0101152-7 2001-03-30
SE0101152A SE521357C2 (en) 2001-03-30 2001-03-30 Hub for a wind turbine in a wind turbine and a wind turbine with such a hub

Publications (1)

Publication Number Publication Date
WO2002079647A1 true WO2002079647A1 (en) 2002-10-10

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WO (1) WO2002079647A1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2850137A1 (en) * 2003-01-16 2004-07-23 Afelec Wind turbine head, has blades assembled in hub for their natural movement with respect to rotor plane against compression resistance of elastic mass, which is supported against blade ends and hub
EP1019631B1 (en) * 1997-09-04 2004-12-29 Lm Glasfiber A/S Windmill rotor and wind blades therefor
WO2007008884A1 (en) * 2005-07-12 2007-01-18 Hamilton Sundstrand Wind-turbine with load-carrying skin
CN101105173A (en) * 2006-07-11 2008-01-16 通用电气公司 Apparatus for assembling rotary machines
WO2008153751A2 (en) * 2007-05-25 2008-12-18 Hill Daryl G Conical washer system for propeller stabilization
US7528497B2 (en) 2006-07-11 2009-05-05 Hamilton Sundstrand Corporation Wind-turbine with load-carrying skin
WO2010140933A1 (en) * 2009-06-02 2010-12-09 Saab Ab Rotor damper and tail rotor with such a rotor damper
WO2013027127A3 (en) * 2011-05-06 2013-07-04 Condor Wind Energy Limited Systems for minimizing the yaw torque needed to control power output by yawing, for wind turbines with two hinged teetering blades
EP2295794A3 (en) * 2009-08-20 2014-07-30 Hamilton Sundstrand Corporation Wind turbine as wind-direction sensor
US9394937B2 (en) 2011-05-10 2016-07-19 Silvestro Caruso Elastomeric teetering hinge
US9719219B2 (en) 2011-05-04 2017-08-01 Condor Wind Energy Limited Helicopter landing deck
US9879653B2 (en) 2011-05-11 2018-01-30 Condor Wind Energy Limited Power management system
IT201700020849A1 (en) * 2017-02-23 2018-08-23 Seawind Ocean Tech Ip B V JOINT FOR OSCILLATING CONNECTION BETWEEN THE ROTOR AND THE TREE OF A WIND TURBINE
US10495060B2 (en) 2011-05-27 2019-12-03 Seawind Ocean Technology Holding Bv Wind turbine control system having a thrust sensor
US10598159B2 (en) 2016-05-06 2020-03-24 General Electric Company Wind turbine bearings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333728A (en) * 1977-08-11 1982-06-08 Textron, Inc. Compound hub spring system for helicopters
US4435646A (en) * 1982-02-24 1984-03-06 North Wind Power Company, Inc. Wind turbine rotor control system
WO1999063218A1 (en) * 1998-06-04 1999-12-09 Forskningscenter Risø Wind turbine hub

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333728A (en) * 1977-08-11 1982-06-08 Textron, Inc. Compound hub spring system for helicopters
US4435646A (en) * 1982-02-24 1984-03-06 North Wind Power Company, Inc. Wind turbine rotor control system
WO1999063218A1 (en) * 1998-06-04 1999-12-09 Forskningscenter Risø Wind turbine hub

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Teknisk beskrivning: Nordic 1000", NORDIC WINDPOWER AB, 10 March 2000 (2000-03-10), Retrieved from the Internet <URL:www.nwp.se> *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1019631B1 (en) * 1997-09-04 2004-12-29 Lm Glasfiber A/S Windmill rotor and wind blades therefor
FR2850137A1 (en) * 2003-01-16 2004-07-23 Afelec Wind turbine head, has blades assembled in hub for their natural movement with respect to rotor plane against compression resistance of elastic mass, which is supported against blade ends and hub
WO2007008884A1 (en) * 2005-07-12 2007-01-18 Hamilton Sundstrand Wind-turbine with load-carrying skin
CN101105173A (en) * 2006-07-11 2008-01-16 通用电气公司 Apparatus for assembling rotary machines
US7528497B2 (en) 2006-07-11 2009-05-05 Hamilton Sundstrand Corporation Wind-turbine with load-carrying skin
WO2008153751A2 (en) * 2007-05-25 2008-12-18 Hill Daryl G Conical washer system for propeller stabilization
WO2008153751A3 (en) * 2007-05-25 2009-04-23 Daryl G Hill Conical washer system for propeller stabilization
US9073636B2 (en) 2009-06-02 2015-07-07 Saab Ab Rotor damper and tail rotor with such a rotor damper
WO2010140933A1 (en) * 2009-06-02 2010-12-09 Saab Ab Rotor damper and tail rotor with such a rotor damper
EP2295794A3 (en) * 2009-08-20 2014-07-30 Hamilton Sundstrand Corporation Wind turbine as wind-direction sensor
US9719219B2 (en) 2011-05-04 2017-08-01 Condor Wind Energy Limited Helicopter landing deck
WO2013027127A3 (en) * 2011-05-06 2013-07-04 Condor Wind Energy Limited Systems for minimizing the yaw torque needed to control power output by yawing, for wind turbines with two hinged teetering blades
US9719491B2 (en) 2011-05-06 2017-08-01 Condor Wind Energy Limited Systems for minimizing yaw torque needed to control power output in two-bladed, teetering hinge wind turbines that control power output by yawing
US9394937B2 (en) 2011-05-10 2016-07-19 Silvestro Caruso Elastomeric teetering hinge
US9879653B2 (en) 2011-05-11 2018-01-30 Condor Wind Energy Limited Power management system
US10495060B2 (en) 2011-05-27 2019-12-03 Seawind Ocean Technology Holding Bv Wind turbine control system having a thrust sensor
US10598159B2 (en) 2016-05-06 2020-03-24 General Electric Company Wind turbine bearings
IT201700020849A1 (en) * 2017-02-23 2018-08-23 Seawind Ocean Tech Ip B V JOINT FOR OSCILLATING CONNECTION BETWEEN THE ROTOR AND THE TREE OF A WIND TURBINE
WO2018154484A1 (en) * 2017-02-23 2018-08-30 Seawind Ocean Technology Ip B.V. Joint for the oscillating connection of the rotor to a shaft of a wind turbine
US11136965B2 (en) 2017-02-23 2021-10-05 Seawind Ocean Technology Ip B.V. Joint for the oscillating connection of the rotor to a shaft of a wind turbine

Also Published As

Publication number Publication date
SE521357C2 (en) 2003-10-28
SE0101152L (en) 2002-10-01
SE0101152D0 (en) 2001-03-30

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