GB2071779A - Wind turbine blade pitch adjustment system - Google Patents

Wind turbine blade pitch adjustment system Download PDF

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Publication number
GB2071779A
GB2071779A GB8106576A GB8106576A GB2071779A GB 2071779 A GB2071779 A GB 2071779A GB 8106576 A GB8106576 A GB 8106576A GB 8106576 A GB8106576 A GB 8106576A GB 2071779 A GB2071779 A GB 2071779A
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United Kingdom
Prior art keywords
wind turbine
blades
blade pitch
hub
adjustment system
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Granted
Application number
GB8106576A
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GB2071779B (en
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Raytheon Technologies Corp
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United Technologies Corp
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Publication date
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Publication of GB2071779A publication Critical patent/GB2071779A/en
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Publication of GB2071779B publication Critical patent/GB2071779B/en
Expired legal-status Critical Current

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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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/04—Automatic control; Regulation
    • 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
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • 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
    • 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
    • F05B2260/79—Bearing, support or actuation arrangements therefor
    • 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
    • F05B2270/00—Control
    • F05B2270/60—Control system actuates through
    • F05B2270/604—Control system actuates through hydraulic actuators
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Wind Motors (AREA)
  • Paper (AREA)

Abstract

A lightweight system for adjusting the pitch of a plurality of variable pitch wind turbine blades comprises, a rotatable hub 15 on which the blades 10, 12 are mounted, an individual hydraulic actuator 28 mounted on the hub and connected to each blade for setting the blade at a preselected pitch and an electrical feedback device 70 providing a controller with a signal indicative of the actual pitch setting of the blades. The actuators are provided with hydraulic fluid by means of a transfer bearing while the feedback device is electrically connected to the controller through slip rings rotatable with the hub (Fig. 3 not shown). <IMAGE>

Description

SPECIFICATION Wind turbine blade pitch adjustment system This application is being filed on even date with U.S. Patent Application Serial No.
130657, for "Wind Turbine Blade Pitch Control System" in the name of Merritt B. Andrews; U.S. Patent Application Serial No.
130658, for "Wind Turbine Blade Pitch Control System" in the names of Robert Shermann, Millard G. Mayo and Philip E. Barnes and U.S. Patent Application Serial No.
1 30656 for "Blade Pitch Actuation System" in the name of Merritt B. Andrews, all assigned to the assignee of the present invention.
Technical Field This invention relates to wind turbines and more particularly to a system for selectively adjusting the pitch of variable pitch wind turbine blades.
Background Art For optimum performance it is desirable to provide wind turbines with variable pitch blades. The pitch of such blades is adjusted by selective pivoting of the blades about their own longitudinal axes, enabling the wind turbine to perform at maximum efficiency throughout a wide range of wind conditions as well as aiding turbine start-up and prevention of overspeed operation (by blade feathering) in high velocity winds.
Various mechanisms have been proposed for varying the pitch of wind turbine blades.
One such mchanism, disclosed in U.S. Patent No. 4,083,651 to Cheney et al and assigned to the assignee of the present invention, employs blades which are torsionally twisted by pendulum members connected thereto, the pendulum members being centrifugally responsive to the rotor speed of the wind turbine to twist the blades thereby varying the blade pitch throughout the operating range of the wind turbine. The blade pitch adjustment range of such a system is of course automatic and incapable of being continuously controlled during operation of the turbine and may not be capable of achieving extremely wide ranges of pitch adjustment.
A second pitch adjusting system for wind turbine blades employs a slide block which rotates with and is longitudinally slidable on the main shaft of the wind turbine. The slide block is connected by means of a plurality of solid links to the wind turbine blades which are mounted on a rotational hub such that the blades are pivotable about their own axes.
The block is also connected to a plurality of fixed actuators through a bearing mechanism.
When an adjustment in blade pitch is desired, the actuators acting through the bearing mechanism, rectilinearly move the slide block over the shaft thereby moving the links which in turn pivot the blades. It will be apprecicated that in this prior art system, to adjust blade pitch, it is necessary not only to expend sufficient energy to overcome the resistance to such movement by the blades themselves but to overcome the mass of the links, slider block and bearing mechanism, and the friction losses associated with the bearings and the movement of the slider block over the shaft.
Inasmuch as the commercial feasibility of wind turbines depends not only on the amount of energy gathered, but on the losses associated with the operation of the wind turbine, it will be appreciated that extensive losses such as those enumerated herein associated with this prior art blade pitch control system, could, under marginal wind conditions, render the turbine commercially infeasible.
While various pitch change mechanisms have been proposed for aircraft propellers, such systems have been found to be generally inapproprate for use on wind turbines. Examples of such pitch change mechanisms are found in U.S. Patent Nos. 1,908,894 to Findley and 3,163,232 to Grindle, the Grin dle patent being assigned to the assignee of the present invention. In the Flndley patent, the pitch of the propeller blades is changed by hub mounted electric motor pivotally driving the propeller blades through a gear set. Such a gear connection of the electric motor to the blades contributes significantly to the weight of the turbine hub thereby introducing substantial losses into the system.In the Grindle patent an hydraulic motor powers the blades in a pitch change mode of operation through a relatively massive rotating cam-bevel gear arrangement which adds substantial weight and significant energy losses to the system.
Disclosure of the Invention Therefore, it is an object of the present invention to provide a wind turbine blade pitch adjustment system which overcomes the deficiencies of the prior art.
Its is another object of the present invention to provide such a pitch adjustment system wherein each blade may be simultaneously positioned at a different pitch angle as called for by the controller.
It is another object of the present invention to provide such a blade pitch adjustment system which is light in weight.
It is another object of the present invention to provide such a blade pitch adjustment system wherein the losses associated with any connection between the system driving means and the blades are minimized.
It is another object of the present invention to provide such a system which is characterized by an economy of structure.
The above and other objects will become more readily apparent from the following detailed description taken in connection with the appended claims and the accompanying drawings wherein there is shown and described a wind turbine blade pitch adjustment system wherein each blade is driven by an individual hydraulic actuator mounted on the hub for rotation therewith and connected directly to the blade thereby eliminating the necessity of intermediate connecting devices such as links, cams, gears and the like and the losses associated with such mechanisms. The actuators are independently controlled by a control means supplying the actuators with hydraulic fluid by way of suitable fluid transfer means such as a transfer bearing preferably disposed on the main turbine shaft.An emergency hydraulic fluid supply for feathering may also be mounted on the hub in direct communica-' tion with the actuators. Feedback means such as 3 linear variable displacement transducer provide a continuous control system input indicative of the pitch position of the blades.
Power for the feedback means is provided thereto by suitable means such as slip ringbush assembly which may also provide connection of the feedback output to the control means, Brief Description of The Drawings Figure 1 is a side elevation of a large wind turbine in which the blade pitch adjustment system of the present invention is employed, a portion of this view being broken away to show structural details of the turbine.
Figure 2 is a schematic, side elevation, partially sectioned and broken away, of a portion of the blade pitch adjustment system of the present invention.
Figure 3 is a schematic, side elevation partially sectional and broken away, of a second portion of the blade pitch adjustment system of the present invention.
Best Mode For Carrying Out The Invention Referring to the drawings, the wind turbine blade pitch control system of the present invention is adapted for use with a wind turbine wherein two or variable pitch blades 10 and 12 are mounted on suitable bearings (not shown) on a rotatable hub 14 (Fig. 2) covered by spinner 1 5 such that the blades are selectively pivotable about the longitudinal axes thereof for controlling the operating speed of the wind turbine throughout a wide range of wind conditions and for feathering the blades when a shutdown of the wind turbine is desired. The hub is secured to rotating shaft 1 6 from which any desired load such as a dynamic electric machine 1 8 or the like may be driven. The shaft speed may be stepped up or down as desired by a suitable gear box 20.The load as well as gear box 20, along with various controls 50 may be disposed within nacelle 22 mounted on a swivel or free pivot connection 24 on tower 26 generally upstream of blades 10 and 12.
The blade pitch adjusting mechanism of the present invention comprises first and second hydraulic actuators or motors 28 each controlling the pitch of a single one of turbine blades by direct connection thereto. While in the preferred embodiment two blades and two actuators are shown, it will be understood that the present invention contemplates any number of blades and associated actuators. Each actuator comprises a cylinder 30 having a reciprocating piston 34 with corresponding connecting rod 36 disposed within the cylinder for reciprocal movement with respect thereto. Hydraulic fluid is admitted into and drained from the cylinder on opposite sides of the piston through hydraulic lines 38 and 40.
As best seen in Fig. 2, each actuator at the free end of the connecting rod thereof is connected to the root portion of the corresponding blade at a first clevis 42, the connection being spaced a distance dfrom the longitudinal axis a of the blade whereby, reciprocation of the piston imparts a pivoting motion of the blade about the longitudinal axis thereof. The opposite end of the actuator at the enclosed end of the cylinder thereof is pivotally connected at 44 to a central portion 46 of hub 14 thereby minimizing the obstruction of wind by the blade actuating mechanism. Since each actuator must only power a single blade, the actuators are generally lightweight and compact when compared to various prior art blade pitch adjustment systems wherein a single actuator drives all the blades in pitch adjustment.Accordingly, the utilization of multiple actuators rather than a single more powerful actuator does not pose a serious weight problem to the turbine hub.
Furthermore, it will be appreciated that employment of an individual lightweight hub mounted actuator for each blade allows a direct connection of the actuator to the blade thereby eliminating the need for heavy and bulky mechanical connections between the blade and actuator such as the slide blocks, links, and bearings employed in prior art wind turbines and rotary cam and gear assemblies employed in prior art propeller pitch change mechanisms. As set forth hereinabove, such prior art pitch change mechanisms reduce the efficiency of the system by introducing into the system, losses due to the weight of the components and the frictional forces incident to the interaction of such components. Moreover, the arrangement of the present invention allows each of the blades to individually adjusted with respect to the pitch thereof, whereby if required, the blades may be simultaneously set by the controller at different pitch settings.
As seen in Figs. 2 and 3, lines 38 and 40 from each of actuators 28 extend axially through the center of hub 14 to control means 50 by way of first transfer means 52.
It will be understood that control means 50 regulates the operation of actuator 28. Where the actuators are hydraulic actuators such as those shown herein, the control means will of course include hydraulic fluid flow control means to selectively pressurize and drain cylinders 30 on opposite sides of pistons 34. A suitable control means is disclosed and claimed in U.S. Patent Application Serial No.
130657, filed 17th March 1980, for "Wind Turbine Blade Pitch Control System", in the name of Merritt B. Andrews.
As shown in Fig. 1, control means 50 is preferably mounted in nacelle 22.
When hydraulic blade actuators are employed, first transfer means comprises a transfer bearing which includes first (outer) and second (inner) concentric members 54 and 56, inner member 56 in the preferred embodiment being rotatable with shaft 1 6 on bearings 57 and comprising an integral portion thereof. Inner member 56 is provided with a plurality of hydraulic fluid passages 58 each including an outer radial portion 60 and an inner longitudinally directed portion 64. Each passage 58 provides pressurized hydraulic fluid to the lines associated with actuators 28 and feather means to be described herein be low. Each of passages 58 communicates at radial portion 60 thereof with an adjacent annular passage 66 in outer member 54, this passage communicating with control means 50 through lines 68 in outer member 54 and conduits extension lines 69.
The pitch adjusting system of the present invention also includes feedback means 70, each such means being mounted on the hub and connected to a corresponding blade and providing control means 50 with a signal indicative of the pitch position of the blade, whereby the control means continuosly adjusts actuators 28 based on the feedback signal to precisely position the blades. In the preferred embodiment, the feedback means comprises an electrical transducer having a movable core pivotally connected to the blade root at second clevis 72, the transducer primary and secondary (stator) being pivotally connected to the hub at 74. Therefore, it will be seen that as actuators 28 pivot the blades, the relative disposition of the core and windings varies thereby causing the output from the secondary to vary in accordance with blade pitch.Connections from the primary and secondary coils of feedback means 70 to control means 50 are made in part through lines 76 which extend from the feedback means, radially inwardly and rearwardly through the hub shaft, and inner transfer bearing member 56 to second transfer means 80.
Referring to Fig. 3, when feedback means 70 are electrical, second transfer means 80 comprises a plurality of slip rings 82 rotatable with the hub either at the same speed thereof or at the higher rotational speed at the output of gear set 20. In the preferred embodiment, the slip rings are mounted on an integral extension of inner transfer bearing member 56, although other equivalent constructions will suggest themselves to those skilled in the art. As best seen in Fig. 3, the electric lines are brought longitudinally through inner member or shaft 56 and radially outwardly, being connected to the slip rings at the sides thereof by soldering or the like. Slip rings 82 engage stationary brushes 84 which are slidable on the slip rings and mounted on a stationary brush holder 86. Electric lines 88 connect the brushes to the controller.
As set forth hereinabove, the control means 50 controls the supply of hydraulic fluid to actuators 28 in response to a pitch position signal provided by feedback means 70, details of the control means not forming part of the present invention. Accordingly, it will become apparent that the control means comprises cooperating electric and fluid logic circuits in any suitable configuration. Reference may be had to the aforementioned Andrews patent application which discloses an hydraulic control circuit suitable for use in a pitch adjustment system as taught herein. Where independent control over the actuators is required, the control means will of course be provided with redundant logic circuits which will simultaneously position each blade at a different pitch angle when operating conditions so require.
The pitch adjustment system of the present invention may also be provided with means powering the blades for the feathering thereof in emergency situations independently of the fluid supply for the actuators and therefore operable despite any malfunction in that supply. In the preferred embodiment, such means comprise a tank or accumulator 90 of pressurized hydraulic fluid commuhicating through line 91 and servo valve 92 with that side of the corresponding actuator which must be pressurized for feathering the associated blade. Servo valve 92 may be either fluid or electrically controlled by controller 50. If fluid controlled, the servo portion or actuator of the valve will communicate with control means 50 through the passages in the transfer bearing.If electrically operated, the valve will be operated by the electrical portion of control means 50, being connected thereto through the slip ring-brush assembly of second transfer means 80.
It will therefore be appreciated that with the system of the present invention, wind turbine blade pitch is adjusted effectively and efficiently without the heavy and often complex prior art mechanical assemblies interconnecting the blades and actuators therefor. The actuators may be relatively light in weight since each performs independently of other blades, being required to power no more than a single blade. Connections between the actuators and control means are also made with an economy of structure thereby further reducing the power required by such a system and thus enhancing the overall efficiency of a wind turbine in which the pitch adjusting system is employed. The provision of the feather accumulators on the hub, in proximity to the blades assures the feathering capability of the system despite failure of the primary actuator fluid supply.
While there has been shown a single embodiment of the pitch adjustment system of the present invention, it will be apparent that various equivalent systems may suggest themselves to those skilled in the art and it is intended by the following claims to cover such equivalent systems as come within the true spirit and scope of this invention.

Claims (10)

1. Wind turbine blade pitch adjustment system comprising a rotatable hub, at least two airfoil blades extending generally radially outwardly from said hub for rotation therewith, each of said blades being pivotable about the longitudinal axis thereof for varying the blade pitch, actuation means being mounted on said hub and rotatable therewith and being directly connected to said blades to effect selected blade pitch positioning, said control system further comprising feedback means mounted on said hub and operatively connected to said blades for producing a signal indicative of blade pitch, control means removed from said hub, said control means regulating said actuators in response at least in part to the signal produced by said feedback means and first and second transfer means, acapted to provide communication across a rotative-stationary interface between said ccntrol means and actuation means and feedback means respectively.
2. Wind turbine blade pitch adjustment system according to Claim 1 wherein said actuation means comprises hydraulic actuation means responsive to pressurized hydraulic fluid supplied thereto.
3. Wind turbine blade pitch adjustment system according to Claim 2 wherein the pitch of each blade is adjusted individually by at least one hydraulic actuator whereby said blades may be simultaneously positioned at a different pitch angle.
4. Wind turbine blade pitch adjustment system according to Claim 3 wherein said first transfer means comprises an hydraulic transfer bearing comprising first and second concentric members, one of said members being rotatably driven with said hub and provided with fluid passages communicating with said hydraulic actuators, the other of said members being stationary and provided with fluid passages communicating with said passages in said one bearing member and further communicating with said control means.
5. Wind turbine blade pitch adjustment system according to Claim 4 wherein each of said hydraulic actuators comprises an hydraulic cylinder having a reciprocal piston disposed therein said actuator being pivotally connected to said blade at a root portion thereof and said hub at a central portion thereof.
6. Wind turbine blade pitch adjustment system according to Claim 2 and further comprising feather means mounted on said hub for rotation therewith, said feather means in response to a signal from said primary control means, providing pressurized hydraulic fluid to said actuation means such that said actuation means effect feathering of said blades.
7. Wind turbine blade pitch adjustment system according to Claim 6 wherein said feather means comprises a reservir of pressurized hydraulic fluid and a servo valve communicating with said hydraulic fluid reservoir and said hydraulic actuation means for controlling the flow of hydraulic fluid therebetween in response to command signals from said primary control means.
8. Wind turbine blade pitch adjustment system according to Claim 1 wherein said feedback means comprises a linear variable differential transducer operatively connected to said blades such that the output of said transducer varies in accordance with the pitch position of said blades.
9. Wind turbine blade pitch adjustment system according to Claim 8 wherein each blade is connected to a single linear variable differential transducer.
10. Wind turbine blade pitch adjustment system according to Claim 8 wherein said second transfer means comprises a plurality of slip rings rotatable with said hub and connected electrically to said linear variable differential transducer, said second transfer means further comprising a plurality of stationary brushes, each of said brushes being in slidable electrical contact with a corresponding one of said slip rings and adapted for electrical connection to said primary control means.
GB8106576A 1980-03-17 1981-03-03 Wind turbine blade pitch adjustment system Expired GB2071779B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13065980A 1980-03-17 1980-03-17

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GB2071779A true GB2071779A (en) 1981-09-23
GB2071779B GB2071779B (en) 1983-06-22

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KR (1) KR850000935B1 (en)
AU (1) AU541909B2 (en)
BR (1) BR8101493A (en)
CA (1) CA1146079A (en)
DE (1) DE3110266A1 (en)
DK (1) DK105181A (en)
ES (1) ES500374A0 (en)
FR (1) FR2478217A1 (en)
GB (1) GB2071779B (en)
IL (1) IL62271A (en)
IT (1) IT1137203B (en)
NL (1) NL8101235A (en)
NO (1) NO810842L (en)
SE (1) SE446654B (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236810A (en) * 1989-07-21 1991-04-17 Dowty Aerospace Gloucester A propeller blade pitch control mechanism
FR2748296A1 (en) * 1996-05-06 1997-11-07 Richer Bertrand Louis Isidore Control device for controlling setting of blades of wind turbine to reduce dynamic loading
EP1241350A1 (en) * 2001-01-22 2002-09-18 Fundacion Fatronik Individual pitch adjustment system for rotor blades
ES2181572A1 (en) * 2001-01-31 2003-02-16 Fundacion Fatronik Device in rotors for the independent control of blade step variation
US6604907B1 (en) * 1999-10-11 2003-08-12 Aerodyn Engineering Gmbh Individual blade adjustment for wind turbines
WO2003091577A1 (en) * 2002-04-24 2003-11-06 Vestas Wind Systems A/S Wind turbine, hydraulic system, air bleed system and method of controlling at least two wind turbine blades
EP1371845A2 (en) * 2002-06-13 2003-12-17 Manuel Torres Martinez Wind turbine hub
WO2005021962A1 (en) * 2003-09-03 2005-03-10 General Electric Company Redundant blade pitch control system for a wind turbine and method for controlling a wind turbine
WO2008000882A1 (en) * 2006-06-21 2008-01-03 Gamesa Innovation & Technology, S.L. Rotary joint for wind-powered generators
DE19720025C5 (en) * 1997-05-13 2008-02-28 Fritz Fahrner Drive for angle adjustment of rotor blades in wind turbines
EP2072815A1 (en) * 2006-10-11 2009-06-24 Gamesa Innovation & Technology, S.L. System for rotating a wind turbine blade
WO2009077842A2 (en) * 2007-12-14 2009-06-25 Innovative Windpower Ag Device for transmitting provision means
GB2461784A (en) * 2008-07-15 2010-01-20 Hamilton Sundstrand Corp Propeller blade pitch control system comprising a hydraulic transfer bearing within a propeller gearbox
EP2154365A1 (en) * 2007-05-25 2010-02-17 Mitsubishi Heavy Industries, Ltd. Pitch driver of wind turbine generator and wind turbine generator
GB2463554A (en) * 2008-08-27 2010-03-24 Schunk Bahn Und Industrietechn Sliding contact retaining device
EP2175132A1 (en) * 2007-11-22 2010-04-14 Mitsubishi Heavy Industries, Ltd. Wind power generator
US20100232964A1 (en) * 2007-11-09 2010-09-16 David Geiger Electro-hydraulic actuator for controlling the pitch of a blade of a wind turbine
WO2010002264A3 (en) * 2008-07-03 2010-10-14 Hydra Tidal Energy Technology As Device for controlling turbine blade pitch
WO2011063815A1 (en) * 2009-11-25 2011-06-03 Avn Energy A/S Method of mounting a hydraulic pitch control system in a wind turbine hub
EP2392819A1 (en) * 2010-05-31 2011-12-07 HAWE Hydraulik SE Device for an electrohydraulic adjustment of a pitch angle of rotor blades on a rotor of a wind turbine
EP2405131A1 (en) * 2010-05-14 2012-01-11 Mitsubishi Heavy Industries, Ltd. Control device for wind turbine
WO2011117081A3 (en) * 2010-03-26 2012-05-10 Siemens Aktiengesellschaft Wind turbine and method of construction of a wind turbine
CN102812242A (en) * 2010-03-26 2012-12-05 西门子公司 Direct drive wind turbine, transport system and method of construction of a direct drive wind turbine
US8398373B2 (en) 2011-02-15 2013-03-19 Mitsubishi Heavy Industries, Ltd. Wind turbine blade pitch-control system, and wind turbine rotor and wind turbine generator provided with the same
EP2108824A3 (en) * 2008-03-28 2016-08-24 General Electric Company Pulsed torque control of wind turbine pitch systems

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MD4219C1 (en) * 2012-09-06 2013-11-30 Технический университет Молдовы Wind turbine with horizontal axis
MD4213C1 (en) * 2012-11-27 2013-10-31 Технический университет Молдовы Wind turbine

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GB1374756A (en) * 1971-10-13 1974-11-20 Hawker Siddeley Dynamics Ltd Fluid pressure servo system
DE3009922A1 (en) * 1980-03-14 1981-09-24 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Wind power generating station with servo control of blades - uses measuring instrument of safety monitoring system producing pulses processed electronically

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236810A (en) * 1989-07-21 1991-04-17 Dowty Aerospace Gloucester A propeller blade pitch control mechanism
FR2748296A1 (en) * 1996-05-06 1997-11-07 Richer Bertrand Louis Isidore Control device for controlling setting of blades of wind turbine to reduce dynamic loading
DE19720025C5 (en) * 1997-05-13 2008-02-28 Fritz Fahrner Drive for angle adjustment of rotor blades in wind turbines
US6604907B1 (en) * 1999-10-11 2003-08-12 Aerodyn Engineering Gmbh Individual blade adjustment for wind turbines
EP1241350A1 (en) * 2001-01-22 2002-09-18 Fundacion Fatronik Individual pitch adjustment system for rotor blades
ES2178955A1 (en) * 2001-01-22 2003-01-01 Fundacion Fatronik Individual pitch adjustment system for rotor blades
ES2181572A1 (en) * 2001-01-31 2003-02-16 Fundacion Fatronik Device in rotors for the independent control of blade step variation
AU2002311008B2 (en) * 2002-04-24 2008-01-31 Vestas Wind Systems A/S Wind turbine, hydraulic system, air bleed system and method of controlling at least two wind turbine blades
WO2003091577A1 (en) * 2002-04-24 2003-11-06 Vestas Wind Systems A/S Wind turbine, hydraulic system, air bleed system and method of controlling at least two wind turbine blades
CN100390426C (en) * 2002-04-24 2008-05-28 威斯塔斯风力系统公开有限公司 Wind turbine, hydraulic system, air bleed system and method for controlling at least two wind turbine blades
US7658594B2 (en) 2002-04-24 2010-02-09 Vestas Wind Systems A/S Wind turbine, hydraulic system, air bleed system and method of controlling at least two wind turbine blades
EP1371845A2 (en) * 2002-06-13 2003-12-17 Manuel Torres Martinez Wind turbine hub
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WO2005021962A1 (en) * 2003-09-03 2005-03-10 General Electric Company Redundant blade pitch control system for a wind turbine and method for controlling a wind turbine
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GB2071779B (en) 1983-06-22
CA1146079A (en) 1983-05-10
JPS57376A (en) 1982-01-05
AU6841181A (en) 1981-09-24
NO810842L (en) 1981-09-18
IL62271A0 (en) 1981-05-20
NL8101235A (en) 1981-10-16
BR8101493A (en) 1981-09-15
FR2478217B1 (en) 1985-01-11
SE8101615L (en) 1981-09-18
IT8120375A0 (en) 1981-03-17
IL62271A (en) 1983-09-30
FR2478217A1 (en) 1981-09-18
KR830005484A (en) 1983-08-20
DK105181A (en) 1981-09-18
KR850000935B1 (en) 1985-06-28
AU541909B2 (en) 1985-01-31
ES8207282A1 (en) 1982-09-01
DE3110266A1 (en) 1982-02-25
SE446654B (en) 1986-09-29
IT1137203B (en) 1986-09-03
ES500374A0 (en) 1982-09-01

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