GB2159584A - Pitch control apparatus - Google Patents

Pitch control apparatus Download PDF

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Publication number
GB2159584A
GB2159584A GB08412918A GB8412918A GB2159584A GB 2159584 A GB2159584 A GB 2159584A GB 08412918 A GB08412918 A GB 08412918A GB 8412918 A GB8412918 A GB 8412918A GB 2159584 A GB2159584 A GB 2159584A
Authority
GB
United Kingdom
Prior art keywords
rotor
rod
region
transmission path
threaded
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB08412918A
Other versions
GB8412918D0 (en
Inventor
John Richard Carew Armstrong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taylor Woodrow Construction Ltd
Original Assignee
Taylor Woodrow Construction Ltd
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 Taylor Woodrow Construction Ltd filed Critical Taylor Woodrow Construction Ltd
Priority to GB08412918A priority Critical patent/GB2159584A/en
Publication of GB8412918D0 publication Critical patent/GB8412918D0/en
Priority to DK221985A priority patent/DK221985A/en
Publication of GB2159584A publication Critical patent/GB2159584A/en
Withdrawn legal-status Critical Current

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
    • 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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D7/00—Rotors with blades adjustable in operation; Control thereof
    • F01D7/02—Rotors with blades adjustable in operation; Control thereof having adjustment responsive to speed
    • 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
    • F05B2270/10—Purpose of the control system
    • F05B2270/107—Purpose of the control system to cope with emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05D2260/74—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
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/70—Adjusting of angle of incidence or attack of rotating blades
    • F05D2260/79—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
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/09—Purpose of the control system to cope with emergencies
    • 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

Landscapes

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

Abstract

The apparatus for a turbine having a bladed rotor, whose rotational speed or torque depends on the blade pitch, comprises an elongate threaded control member 2 linear movement of which controls the pitch, the control member being driven via a reversible power transmission path including electric motor 10, gearing 8,9 and ball nut 5, such that in the case of failure of the normal power supply to the pitch control apparatus, the rotational energy of the rotor acts through this path to effect blade feathering. <IMAGE>

Description

SPECIFICATION Pitch control apparatus This invention relates to a pitch control apparatus, for example for use in a horizontal axis wind turbine.
Such wind turbines generally comprise a rotor having a hub with two or more blades whose pitch can be adjusted, and on whose pitch the speed or torque of the rotor depends; a step-up gearbox for increasing the speed derived from the rotor; and a generator driven by a high speed shaft of the step-up gearbox.
One of the main requirements of a wind turbine pitch control apparatus is that it should be failsafe; that is if the power supply to the apparatus-usually the electric grid fails, the blades of the rotor should automatically revert to their feathered position. On most conventional turbines having variable pitch this is done by using a hydraulic actuation system with a pressure accumulator which biases a ram to one end of its travel when an electrically held on solenoid valve is released. However, hydraulics tend to be unreliable, and electro-mechanical systems are preferred: these however generally utilise motor/ worm-drive arrangements which, alone, are not failsafe.
In addition, a pitch control apparatus should be capable of placing the rotor in a condition for starting (by moving the blades from their feathered position towards a position of fine pitch), controlling the power output of the rotor, and acting as a means for placing the rotor in a condition for stopping, even when the power supply to the pitch control apparatus fails. The apparatus should further be able to change the pitch angle of the blades at a suitable rate, for example up to about 10% per second, be simple, robust, have a long working life and be designed to operate with as little maintenance as possible avoiding the use of sliding surfaces which have a high potential for wear.
In accordance with the present invention there is provided a pitch control apparatus for a turbine having a bladed rotor whose rotational speed or torque is controlled by blade pitch, the apparatus utilising rotational energy of the rotor for automatically placing the rotor in a feathering condition upon failure of a normal power supply to the pitch control apparatus.
In a specific form the pitch control apparatus comprises an elongate control member, linear movement of which controls the blade pitch, and actuating means driven by the power supply for effecting such linear movement of the elongate control member, in response to the rotational speed of therotor, via a reversible power transmission path such that, in the case of failure of the normal power supply to the pitch control apparatus, the rotational energy of the rotor acts through this path to effect blade feathering.This elongate control member is fixed to, and rotatable with, the rotor, and comprises a rod having a screw-threaded region at a region thereof remote from the rotor, the actuating means comprising an internally screw-threaded member co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing this threaded member to rotate about the rod to effect, via the power transmission path, the linear movement of the rod to control the blade pitch; the threaded region, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded member to effect, via the power transmission path, linear movement of the rod to place the rotor in feathering condition.Alternatively the elongate control member comprises a rod having a screw-threaded region at a region thereof proximate the rotor, the actuating means comprising an internally screwthreaded member fast for rotation with the rotor and co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing the rod to rotate with respect to the internally threaded member to effect, via the power transmission path, linear movement of the rod to control the blade pitch; the internally screw-threaded member, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded region of the rod to effect, via the power transmission path, linear movement of the rod to place the rotor in feathering condition.
The drive means can be an electric motor, there being a control means for controlling the speed of the motor in response to the rotational speed of the rotor.
For a better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawing, in which the single Figure is a schematic perspective view of a pitch control apparatus.
In Figure 1 a shaft of a step-up gear-box of a wind turbine is referenced 1. A control rod 2 passes through an axial bore 1 a in the gearbox shaft 1. Movement of the control rod 2 along the line of movement of arrow A, that is linear movement of the rod 2, causes the pitch of the blades of the wind turbine to be adjusted. The adjustment of the pitch of the blades takes place via a linkage attached to the control rod, full details of which linkage will not be described herein.
The control rod 2 has a screw-threaded region 4, at the end region thereof remote from the rotor, the control rod 2 and its screw-threaded region 4 being fast for rotation with the rotor. A ball nut 5 is mounted on the screw-threaded region 4, in a gimbal 6, with the balls that run in the grooves of the nut also running in the grooves of the screwthreaded region. There is thus provided a reversible power transmission path between the central rod 2 and the ball nut 5. The provision of the gimbal substantially prevents misalignment of the nut 5.
The gimbal 6 is driven by a gear box generally designated by reference numeral 7 and having a first gear wheel 8 with a bore 8a therethrough through which passes the screw-threaded region, and a second gear wheel 9 which is driven by an electric motor 10 via a shaft 1 0a, the motor 10 constituting the normal power supply to the pitch control apparatus. The gear wheel 8 is fixed to the gimbal 6 by way of mountings 11. Gear wheel bearings are provided (not shown) to take axial load on the screw-threaded region 4 onto a fixed gearbox casing (not shown). A control unit (not shown) is provided to control the speed of the motor 10 in response to the running speed of the rotor which is dependent on the pitch of the blades.
The operation of the apparatus shown in Figure 1 will now be described.
Before starting, with the rotor at least at rest and the blades in their feathered position, the electric motor 10 is driven to rotate in the direction of arrow C. The gear wheel 9 drives the gear wheel 8 in the direction of arrow D, causing the ball nut 5 to revolve around the screw-threaded region 4 and thus move the control rod along the line of movement A to move the blades into a position of fine pitch.
As the blades are moved from their feathered to their pitched positions, the rotor can begin to rotate under the action of wind on the blades, accelerating until it reaches a predetermined speed Wr. At this speed, the control unit adjusts the speed of the motor 10 so that the rotational speed Wb of the ball nut 5 equals the rotational speed Wr of the rotor.
Consequently there is no linear movement of the control rod 2 and the pitch of the blades thus remains fixed.
However, if the rotational speed, Wr, of the rotor increases due to an increase in wind speed driving the turbine, and the output power exceeds a predetermined value Pmax, the control unit senses this increase in speed and causes the speed of the motor 10 to be reduced. As this is done, the rotational speed Wb of the ball nut 5 is reduced relative to the rotational speed of the screw-threaded region 4 and as a result the control rod 2 is moved along the line of movement A to cause the blades to reduce their pitch until, at the desired power Pmax, the rotational speed Wb of the ball nut 5 equals the rotational speed Wr of the screw-threaded region 4 and rotor.
Similarly, if the wind speed drops below the required value, the control unit causes the speed of the motor 10 to be increased and the above procedure operates in reverse to cause the blades to increase their pitch to restore the power to the desired value.
If the motor 10 is stopped, either on purpose or because of a failure in its power supply (which will usually be the grid mains), the resultant rotation of the rotor with the control rod 2 and screw-threaded region 4 relative to the ball nut 5 causes the control rod 2 to move in a direction so as to cause the blades to feather until the rotor stops, this change in the setting of the blades being brought about by the rotational energy of the rotor acting through the reversible power transmission path.
It is possible to set the thread pitch of the screw-threaded region to give a desired rate of change of blade pitch under emergency stop conditions. For example, to prevent the rotor from running too fast under a mains failure condition for a desired power Pmax = 200 KW, a turbine diameter of 25 m and a desired rotor speed Wr = 48 rpm, a lead of 40 mm can be adopted for the screw-threaded region 4. This can be achieved by using a triple start thread of 20 mm pitch.
The apparatus shown in Figure 1 is simple, robust, requires little maintenance and, by virtue of the fact that the relative movement of the nut 5 and screw-threaded region 4 is minimal, has a long life.
The above-described apparatus overcomes the difficulties involved with the use of pneumatically or hydraulically powered systems by using, as the power source, an electric motor.
Electric motors are clean, reliable, cheap and require little maintenance.
Further, the energy required to drive the motor 10 is transferred continuously throughout operation of the turbine via the rotor, to a generator driven by the turbine so that net losses are kept to a minimum, arising from heat from the electricity supplied to the control unit and from friction.
It will be appreciated that apparatus such as has been described can take other forms. For example, the ball nut 5 and the contol rod 2 can be interchanged, it being the nut 5 that is rotationally fast with the rotor, and the control rod 2 that is coupled with the motor 10 via the reversible power transmission path. The transmission of power can be other than through a co-operating screw-thraded region and nut arrangement, provided that the transmission path is reversible, for example the screw-threaded region could co-operate with an appropriately toothed segment, or some other form of gear arrangement could be utilised.

Claims (6)

1. A pitch control apparatus for a turbine having a bladed rotor whose rotational speed or torque is controlled by blade pitch, the apparatus utilising rotational energy of the rotor for automatically placing the rotor in a feathering condition upon failure of a normal power supply to the pitch control apparatus.
2. An apparatus as claimed in claim 1, wherein the apparatus comprises an elongate control member, linear movement of which controls the blade pitch, and actuating means driven by the power supply for effecting such linear movement of the elongate control member, in response to the rotational speed of the rotor, via a reversible power transmission path such that, in the case of failure of the normal power supply to the pitch control apparatus, the rotational energy of the rotor acts through this path to effect blade feathering.
3. An apparatus as claimed in claim 2, wherein the elongate control member is fast for rotation with the rotor and comprises a rod having a screw-threaded region at a region thereof remote from the rotor, the actuating means comprising an internally screwthreaded member co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing this threaded member to rotate about the rod to effect, via the power transmission path, the linear movement of the rod to control the blade pitch; the threaded region, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded member to effect, via the power transmission path, linear movement of the rod to place the rotor in feathering condition.
4. An apparatus as claimed in claim 2, wherein the elongate control member comprises a rod having a screw-threaded region at a region thereof proximate the rotor, the actuating means comprising an internally screwthreaded member fast for rotation with the rotor and co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing the rod to rotate with respect to the internally threaded member to effect, via the power transmission path, linear movement of the rod to control the blade pitch: the internally screw-threaded member, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded region of the rod to effect, via the power transmission path, linear movement of the rod to place the rotor in feathering condition.
5. An apparatus as claimed in claim 3 or 4, wherein the co-operation between the internally screw-threaded member and the screwthreaded region is via balls running in the grooves of the member and region.
6. A pitch control apparatus substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
6. An apparatus as claimed in claim 3, 4 or 5, wherein the drive means comprises an electric motor, there being a control means for controlling the speed of the motor in response to the rotational speed of the rotor.
7. A pitch control apparatus substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
CLAIMS New claims or amendments to claims filed on 29 May 85 Superseded claims 1 to New or amended claims:
1. A pitch control apparatus for a turbine having a bladed rotor whose rotational speed or torque is controlled by blade pitch, the apparatus comprising an elongate control member, linear movement of which controls the blade pitch, and actuating means driven by a power supply for effecting such linear movement of the elongate control member, in response to the rotational speed of the rotor, via a reversible power transmission path such that, in the case of failure of such power supply to the pitch control apparatus, the rotational energy of the rotor acts through this path automatically to effect blade feathering.
2. An apparatus as claimed in claim 1, wherein the elongate control member is fast for rotation with the rotor and comprises a rod having a screw-threaded region at a region thereof remote from the rotor, the actuating means comprising an internally screwthreaded member co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing this threaded member to rotate about the rod to effect, via the power transmission path, the linear movement of the rod to control the blade pitch; the threaded region, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded member to effect, via the power transmission path, linear movement of the rod to place the rotor in feathering condition.
3. An apparatus as claimed in claim 1, wherein the elongate control member comprises a rod having a screw-threaded region at a region thereof proximate the rotor, the actuating means comprising an internally screwthreaded member fast for rotation with the rotor and co-operating with the threaded region of the rod to provide the reversible power transmission path, and drive means driven by the normal power supply for causing the rod to rotate with respect to the internally threaded member to effect, via the power transmission path, linear movement of the rod to control the blade pitch; the internally screw-threaded member, upon failure of the normal power supply, being driven by the rotor to rotate relative to the threaded region of the rod to effect, via the power transmission path, linear movement of the rod to palce the rotor in feathering condition.
4. An apparatus as claimed in claim 2 or 3, wherein the co-operation between the internally screw-threaded member and the screwthreaded region is via balls running in the grooves of the member and region.
5. An apparatus as claimed in claim 2, 3 or 4, wherein the drive means comprises an electric motor, there being a control means for controlling the speed of the motor in response to the rotational speed of the rotor.
GB08412918A 1984-05-21 1984-05-21 Pitch control apparatus Withdrawn GB2159584A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08412918A GB2159584A (en) 1984-05-21 1984-05-21 Pitch control apparatus
DK221985A DK221985A (en) 1984-05-21 1985-05-20 INCREASE CONTROL DEVICE FOR A WIND TURBINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08412918A GB2159584A (en) 1984-05-21 1984-05-21 Pitch control apparatus

Publications (2)

Publication Number Publication Date
GB8412918D0 GB8412918D0 (en) 1984-06-27
GB2159584A true GB2159584A (en) 1985-12-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08412918A Withdrawn GB2159584A (en) 1984-05-21 1984-05-21 Pitch control apparatus

Country Status (2)

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DK (1) DK221985A (en)
GB (1) GB2159584A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015949A1 (en) * 1998-09-16 2000-03-23 Sewon Semiconductor Inc. Apparatus for adjusting angle of blade of rotating body
WO2000061942A1 (en) * 1999-04-14 2000-10-19 Neg Micon A/S Device for adjusting the pitch of the blades of a wind turbine and a method for stopping the rotation of the main shaft
EP1128064A2 (en) * 2000-02-28 2001-08-29 Norbert Hennchen Electric pitch change device for a wind turbine
EP1998042A1 (en) * 2007-05-30 2008-12-03 ICEC Holding AG Rotor unit and its application
WO2010063562A2 (en) * 2008-12-03 2010-06-10 Ssb-Antriebstechnik Gmbh & Co. Kg Rotor for a wind turbine
WO2011042375A1 (en) * 2009-10-07 2011-04-14 Ssb Wind Systems Gmbh & Co. Kg Rotor for a wind power plant
CN102080623A (en) * 2009-11-26 2011-06-01 Ssb风***两合公司 Rotor for a wind power plant
GB2492462A (en) * 2011-06-27 2013-01-02 Tidalstream Ltd Variable pitch rotor of underwater turbine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863046A (en) * 1958-07-23 1961-03-15 Rotax Ltd Air-driven rotary driving means for an alternating electric current generator
WO1983000195A1 (en) * 1981-07-13 1983-01-20 Allan Chertok Windpower system
EP0094106A2 (en) * 1982-03-26 1983-11-16 FDO Technische Adviseurs B.V. Blade setting mechanism for the rotor blades of a windmill
EP0095908A2 (en) * 1982-05-28 1983-12-07 The Garrett Corporation Speed control apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB863046A (en) * 1958-07-23 1961-03-15 Rotax Ltd Air-driven rotary driving means for an alternating electric current generator
WO1983000195A1 (en) * 1981-07-13 1983-01-20 Allan Chertok Windpower system
EP0094106A2 (en) * 1982-03-26 1983-11-16 FDO Technische Adviseurs B.V. Blade setting mechanism for the rotor blades of a windmill
EP0095908A2 (en) * 1982-05-28 1983-12-07 The Garrett Corporation Speed control apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000015949A1 (en) * 1998-09-16 2000-03-23 Sewon Semiconductor Inc. Apparatus for adjusting angle of blade of rotating body
WO2000061942A1 (en) * 1999-04-14 2000-10-19 Neg Micon A/S Device for adjusting the pitch of the blades of a wind turbine and a method for stopping the rotation of the main shaft
EP1128064A2 (en) * 2000-02-28 2001-08-29 Norbert Hennchen Electric pitch change device for a wind turbine
EP1128064A3 (en) * 2000-02-28 2005-01-26 Norbert Hennchen Electric pitch change device for a wind turbine
EP1998042A1 (en) * 2007-05-30 2008-12-03 ICEC Holding AG Rotor unit and its application
WO2010063562A3 (en) * 2008-12-03 2010-10-21 Ssb Wind Systems Gmbh & Co. Kg Rotor for a wind turbine
WO2010063562A2 (en) * 2008-12-03 2010-06-10 Ssb-Antriebstechnik Gmbh & Co. Kg Rotor for a wind turbine
WO2011042375A1 (en) * 2009-10-07 2011-04-14 Ssb Wind Systems Gmbh & Co. Kg Rotor for a wind power plant
US9004867B2 (en) 2009-10-07 2015-04-14 SSB Wind Systems GmbH & Co., KG Rotor for a wind turbine
CN102080623A (en) * 2009-11-26 2011-06-01 Ssb风***两合公司 Rotor for a wind power plant
CN102080623B (en) * 2009-11-26 2015-03-25 Ssb风***两合公司 Rotor for a wind power plant
US9255568B2 (en) * 2009-11-26 2016-02-09 Ssb Wind Systems Gmbh & Co. Kg Rotor for a wind turbine
GB2492462A (en) * 2011-06-27 2013-01-02 Tidalstream Ltd Variable pitch rotor of underwater turbine

Also Published As

Publication number Publication date
DK221985A (en) 1985-11-22
GB8412918D0 (en) 1984-06-27
DK221985D0 (en) 1985-05-20

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