US1403069A - Means for regulating the speed of wind motors - Google Patents

Means for regulating the speed of wind motors Download PDF

Info

Publication number
US1403069A
US1403069A US491833A US49183321A US1403069A US 1403069 A US1403069 A US 1403069A US 491833 A US491833 A US 491833A US 49183321 A US49183321 A US 49183321A US 1403069 A US1403069 A US 1403069A
Authority
US
United States
Prior art keywords
components
vane
vanes
speed
rod
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.)
Expired - Lifetime
Application number
US491833A
Inventor
Burne Edward Lancaster
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US491833A priority Critical patent/US1403069A/en
Application granted granted Critical
Publication of US1403069A publication Critical patent/US1403069A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • F05B2260/75—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism not using auxiliary power sources, e.g. servos
    • 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
    • F05B2260/77—Adjusting of angle of incidence or attack of rotating blades the adjusting mechanism driven or triggered by centrifugal forces
    • 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

  • This invention relates to automatic means for controlling the speed of windmotors.
  • the object of this invention is to provide means for automatically controlling the speed of windmotors in such'amanner that the speed will not be affected by varying wind conditionsv v
  • the drawlngs filed herewith show one form of apparatus made in accordance with this invention in which':-'
  • Fig. l is a front elevation of one of the windniotor vanes.
  • Fig. 2 is an end view of the inner end of one of the vanes showing the components of the vanes 1n the normal positlon.
  • Fig. 3 is a similar view showing a typical position of the components during the governing action.
  • Fig. 4- is a similar view showing the com ponents of the vanes furled. i i
  • Fig. 5 is a side elevation of the apparatus showing one form of governing mechanismJ YFig. 6 is a view of an alternative govern- 111g mechanlsm.
  • Fig. 7 shows T11 alternative method of transmitting the motion of the vane comand e are secured to the components a and 5 or to an'extenslon carrled thereby, the
  • Fig. 18 shows yet another alternative method of. transmitting the motionof the vane components to the governing niecha- .nism.
  • the windmotor may be provided with any suitable number of 'vanes,one ofwhich is shown in Fig. 1.
  • the vane i'sdividedin the direction of its radial length into two com-' ponents, one of which I term the leading component a and the other the trailing component Z), these two components being pivoted in any suitable manner to a supporting radial arm cdisposed between them,
  • the leading component a is pivoted at or near the line of its back edge-and the trailing component Z) is pivoted-at or near the line of its front edge by any suitable method (such as hinges d (Z attached to the com- Specification of Letters Patent.
  • the vane components might be hlnged in front of or behind the said arm instead of on either side.
  • the components might be mounted between concentric rings bounding their inner and outer extremities and forming part of the framework of a windmotor wheel, and the vane components provided with pivots at their extremities, the pivots working in sockets
  • the relative widths and the shape of the vane components may be varied; for example, the leading component might be as wide or wider than thefollowing, component and one or both components might be wider at the outer than at the inner extremity, or they might be parallel throughouttheir length.
  • the twocomponents are set at suitable angles for receiving the impulse of the wind.
  • the following component increase and tend toapproximate to a right angle to the plane components may also be furnished by an increase in load on the windmotor broughtof rotation and to take up a position more or 'less parallel tothe direction of the wind, as
  • the rod h is provided with a rack it Which engages a pinion m mounted on' a shaft 11.
  • Mounted on'the shaft n is a drum 0 about which is wound a chain 79 provided with a weight g. .Insteadof the weight g a tension spring may be employed.
  • the chain and weighttend to rotate the drum thereby causing movement of the rod h which transmits the motion to thevane components.
  • a bell crank lever may be employed one arm of which-is adapted to coact with the spring or weight and the other arm being provided with a forked end engaging a grooved collarmounted on the rod h.
  • the resistance to the folding back of the vane components may be furnished by a centrifugal or other governor.
  • a centrifugal or other governor One way by which this may be accomplished isshown in Fig. 6 in which the main shaft j carries a spur wheel 9" which drives a spur wheel 8 mounted on the shaft of a centrifugal governor t.
  • a sliding collar u is mounted onfthe governor shaft provided ;with a circumferential groove. The rod it also carries a similar collar 4).
  • An arm w forked at its; extremities coacts wlth the collars u and 'o and is pivoted at a suitable intermediate point x.
  • centrifugal govs 'ernor may be used either with or without the rack and pinion mechanism described with reference-to Itig-d The resistance toithe folding backof the about. by an increase in speed.
  • Fig. 7 shows pinions 2,. 2mounted on the axial line upon which each component turns, the said pinions operating racks'3, 3 which are con nected to the rod h coacting witha spring weight or governor as above described.
  • Each vane in the windmotor has an arm corresponding to g, or, if preferred, a' ring may takethe place of the several arms, the
  • said ring being connected to the rod h by two or more spokes.
  • each vane may. to some extent regulate independently. Iinsert a spiral or other suitable spring 4: between the end of the eye bolt 7 and the arm (1 which allows the parts of the vane to a limited extent without movement of the vanes collectively.
  • the links 01 and 6 may, if desired, be arranged so as to be in'compression instead of in tensionand the rod, It so as to be .in tension instead of compression with the wards 1 1 I
  • the links d anclqte might be behind the components instead of in front. This alternative. form 1 of construction is shown in Fig. 8.
  • a .collar 5, .provided with a circumferential groove 6 is slidably mounted on the main shaft of the 'main shaft of the windmotorsoas to be free to rotate thereon; the motion of the shaft is .transmitted to the driving wheel through f are .wind- .pressure to fold back the component I V V forcing back the rod 71. and affecting the connected to the collar 5 by rodsS.
  • a bell 1 crank lever 9, pivoted at 10, is provided with a forked arm 11 engaging with the groove 6 in the 'collaro.
  • the other arm 12 of the bell ,crank lever is the medium by which theresistance of a weight spring or governor iS pblied. r I
  • vanes may be furled by releasing the spring or weight acting on the red It and allowing them to fall back, so that their surfaces assume a position more or less parallel with the direction of the wind with their edges presented to it.
  • vanes of large size I may divide the component portions into two or more components in the direction of their; length; each longitudinal component being independently supported by hinging to a radial arm common to all the components or by pivoting each component between concentric rings bounding their inner and outer extremities; the whole forminga complete vane; the angles of the several components of the vane being regulated, either independently or collectively substantially in the'same manner as that described for vanes of two components only.
  • V ⁇ Vhat I claim and desire to ters Patent is 1*- 1.
  • a vane composed of two secure by Letlongitudinal components, namely a leading and a following portion, the leading portion under normal working conditlons being inclined at a salient angleto the following portion of the vane the angle varying from the tip towards the inner extremity, and means for automatically moving a portion of the vanes to a less effective position and later the leading portion into a position tending to produce backward rotation of the vanes. 7
  • a windmotor of the character claimed in claim 1 means for moving a portion of the vanes comprising a rod running through the'hollow, main shaft on which the vanes are mounted, members carried by said'rod, connecting links adapted to connect said members to said portion of the vanes and adjustable means acting on said rod;

Landscapes

  • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Description

E. L. BURNE.
MEANS FOR REGULATING THE SPEED OF WjNDMOIORS.
APPLICATION FILED AUG-l2 192i.
4 O' I 1 Patented Jan. 10,1922.
gSHEETS-SHEET 1,
E. L. B URNE.
MEANS FOR REGULATING THE SPEED OF WINDMOIORS. APPLICATION FILED AUG. I2, 192!- 1,403 ,069, Patented Jah- 10, 1922.
2 SHEETS-SHEET 2.
A Yw
MEANSFOR nneu nrrNe rnnsPnnn or wrNn MOTORS.
This invention relates to automatic means for controlling the speed of windmotors.
The object of this invention is to provide means for automatically controlling the speed of windmotors in such'amanner that the speed will not be affected by varying wind conditionsv v The drawlngs filed herewith show one form of apparatus made in accordance with this invention in which':-'
Fig. l is a front elevation of one of the windniotor vanes.
Fig. 2 is an end view of the inner end of one of the vanes showing the components of the vanes 1n the normal positlon.
Fig. 3 is a similar view showing a typical position of the components during the governing action.
Fig. 4- is a similar view showing the com ponents of the vanes furled. i i
Fig. 5 is a side elevation of the apparatus showing one form of governing mechanismJ YFig. 6 is a view of an alternative govern- 111g mechanlsm.
Fig. 7 shows T11 alternative method of transmitting the motion of the vane comand e are secured to the components a and 5 or to an'extenslon carrled thereby, the
ponents to the'governing mechanism.
Fig. 18 shows yet another alternative method of. transmitting the motionof the vane components to the governing niecha- .nism. I
The windmotor may be provided with any suitable number of 'vanes,one ofwhich is shown in Fig. 1. The vane i'sdividedin the direction of its radial length into two com-' ponents, one of which I term the leading component a and the other the trailing component Z), these two components being pivoted in any suitable manner to a supporting radial arm cdisposed between them,
The leading component a is pivoted at or near the line of its back edge-and the trailing component Z) is pivoted-at or near the line of its front edge by any suitable method (such as hinges d (Z attached to the com- Specification of Letters Patent.
in the said rings.
latented Jan. 10, 1922.
Application filed August 12,1921; Serial No. 1431,8333.
ponents (Land 6 and to the supporting arm 0) in such a manner that the component parts of the vane can move in the same relationto each other as the flaps of a hinge.
Obviously the vane components might be hlnged in front of or behind the said arm instead of on either side. Instead of being supported by a radial arm as shown the components might be mounted between concentric rings bounding their inner and outer extremities and forming part of the framework of a windmotor wheel, and the vane components provided with pivots at their extremities, the pivots working in sockets Further the relative widths and the shape of the vane components may be varied; for example, the leading component might be as wide or wider than thefollowing, component and one or both components might be wider at the outer than at the inner extremity, or they might be parallel throughouttheir length.
When the vane is in a working position the twocomponents are set at suitable angles for receiving the impulse of the wind.
This position is shown in Fig. 2. i r
I I' "mpart a twist to the surface of the following component of the vaneso that the angle, with the plane of rotation, increases as the axis of the windmotor isapproached, but I prefer to make the leading component a plane surface with a uniforminclination equal to the greatest angle of the following component, i. e.;when the latter is in normal to millwrights.
Referring to Figs. 2 and 5, two links (Z other endsofsaid links'being attached to an eye bolt f, the connections being made by pin joints. The eye bolt 7 passes through the end ofan' arm 9 11116 said arm being secured toa rod h at right angles to it. This rod '72. passes axially through the hollow main shaft 7' of the windmotor.
In'applying my invention to govern the speed of windmotors, I cause the two components of the vane to fold back from the 9O -working position, upon the principles known wind to the extent required so that the angle of the leading componentofthe VLDG,W1th the plane of rotation, tends to diminish and even become a negative angle, whilst the angle, or angles if the surface is helical, of
the following component increase and tend toapproximate to a right angle to the plane components may also be furnished by an increase in load on the windmotor broughtof rotation and to take up a position more or 'less parallel tothe direction of the wind, as
is indicated in Figure 3. I arrange that the leading component may not too quickly at tain a negative angle.
In order that the angular movement of the component parts of the vane conse quently the speed regulationof the windmo tor shall be automatic I oppose the tendency of the wind pressure to fold backtlie components of the vanes by-the resistance of an adjustable spring or weight. One method of carrying out this invention is shownin Itig. 5. The rod h is provided with a rack it Which engages a pinion m mounted on' a shaft 11.. Mounted on'the shaft n is a drum 0 about which is wound a chain 79 provided with a weight g. .Insteadof the weight g a tension spring may be employed. The chain and weighttend to rotate the drum thereby causing movement of the rod h which transmits the motion to thevane components. Instead of the spring or weight operating on a chain a bell crank lever may be employed one arm of which-is adapted to coact with the spring or weight and the other arm being provided with a forked end engaging a grooved collarmounted on the rod h. I
If desired the resistance to the folding back of the vane components may be furnished by a centrifugal or other governor. One way by which this may be accomplished isshown in Fig. 6 in which the main shaft j carries a spur wheel 9" which drives a spur wheel 8 mounted on the shaft of a centrifugal governor t. A sliding collar u is mounted onfthe governor shaft provided ;with a circumferential groove. The rod it also carries a similar collar 4). An arm w forked at its; extremities coacts wlth the collars u and 'o and is pivoted at a suitable intermediate point x. Thus an increase of speed of the windmotor will cause movement of'the collar 'u/on the governor shaft which inturn will move the rod h and tend to fold back the vane components. The centrifugal govs 'ernor may be used either with or without the rack and pinion mechanism described with reference-to Itig-d The resistance toithe folding backof the about. by an increase in speed.
One way in which thlsmay be done,- assuming the windmotor tobe driving a dyname, is to mount a driving wheel on the some elastic medium such as a spring detake'place-between the driving shaft and the wheel (in fact a kind of:lag). which move- I the vanes; In this case the'eye bolts angles of the components of the vanes. Thus it will be seen that the anglesof" the vane couldbe adjusted by the load instead of by "the force of'the wind, or again by a combinationof both agencies.
' Instead of the method of transmitting the resistance ofthe spring or weight or governor to the'vane components described with reference to Figs. 5 and. 6, I may employ the alternative method shown in Fig. 7 which shows pinions 2,. 2mounted on the axial line upon which each component turns, the said pinions operating racks'3, 3 which are con nected to the rod h coacting witha spring weight or governor as above described.
In. operation if. the wind pressure exceeds in. effect that of the spring or weight it will force back the components a and I) of the vanes causing them to turn on their hinges thereby drawingback the links 62 and e and with them the eye bolt f, the arm 9 and the red It overcoming the outward thrust due to the spring orweightvWhen the wind pressurediminishes to an eifect'belowthat due to that of the-spr'ing orweight acting on the rod h, a reverse action takes place and the vane components resume their normar angles.
, Each vane in the windmotor has an arm corresponding to g, or, if preferred, a' ring may takethe place of the several arms, the
said ring being connected to the rod h by two or more spokes. g
In order that each vane may. to some extent regulate independently. Iinsert a spiral or other suitable spring 4: between the end of the eye bolt 7 and the arm (1 which allows the parts of the vane to a limited extent without movement of the vanes collectively.
. -Obviously the links 01 and 6 may, if desired, be arranged so as to be in'compression instead of in tensionand the rod, It so as to be .in tension instead of compression with the wards 1 1 I Obviously the links d anclqte might be behind the components instead of in front. This alternative. form 1 of construction is shown in Fig. 8. Instead of a rod passing through a hollow main shaft" a .collar 5, .provided with a circumferential groove 6, is slidably mounted on the main shaft of the 'main shaft of the windmotorsoas to be free to rotate thereon; the motion of the shaft is .transmitted to the driving wheel through f are .wind- .pressure to fold back the component I V V forcing back the rod 71. and affecting the connected to the collar 5 by rodsS. A bell 1 crank lever 9, pivoted at 10, is provided with a forked arm 11 engaging with the groove 6 in the 'collaro. The other arm 12 of the bell ,crank lever :is the medium by which theresistance of a weight spring or governor iS pblied. r I
lVhen it is desired to stop the windmotor the vanes may be furled by releasing the spring or weight acting on the red It and allowing them to fall back, so that their surfaces assume a position more or less parallel with the direction of the wind with their edges presented to it. I
If desired, automatic regulation may be suspended and the angles of thecvanes adjusted and fixed to suit the prevailing conditions. In vanes of large size I may divide the component portions into two or more components in the direction of their; length; each longitudinal component being independently supported by hinging to a radial arm common to all the components or by pivoting each component between concentric rings bounding their inner and outer extremities; the whole forminga complete vane; the angles of the several components of the vane being regulated, either independently or collectively substantially in the'same manner as that described for vanes of two components only.
V \Vhat I claim and desire to ters Patent is 1*- 1. In windmotors, a vane composed of two secure by Letlongitudinal components, namely a leading and a following portion, the leading portion under normal working conditlons being inclined at a salient angleto the following portion of the vane the angle varying from the tip towards the inner extremity, and means for automatically moving a portion of the vanes to a less effective position and later the leading portion into a position tending to produce backward rotation of the vanes. 7
2. In windmotors of the character claimed in claim 1, radial axes having the vanes mounted thereon both portions of which are adapted to be folded back by the action of the wind against a predetermined pressure andto be returned to their normal position.
A windmotor of the character claimed in claim 1 means for moving a portion of the vanes comprising a rod running through the'hollow, main shaft on which the vanes are mounted, members carried by said'rod, connecting links adapted to connect said members to said portion of the vanes and adjustable means acting on said rod;
at. In windmotors of the character claimed in claim 1, means for adjusting the angle of the portions of the vanes, and means for maintaining a constant speed under varying loads of the driven member.
In testimony whereof I have signed my name to this specification.
EDWARD LANCASTER BURNE.
US491833A 1921-08-12 1921-08-12 Means for regulating the speed of wind motors Expired - Lifetime US1403069A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US491833A US1403069A (en) 1921-08-12 1921-08-12 Means for regulating the speed of wind motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US491833A US1403069A (en) 1921-08-12 1921-08-12 Means for regulating the speed of wind motors

Publications (1)

Publication Number Publication Date
US1403069A true US1403069A (en) 1922-01-10

Family

ID=23953862

Family Applications (1)

Application Number Title Priority Date Filing Date
US491833A Expired - Lifetime US1403069A (en) 1921-08-12 1921-08-12 Means for regulating the speed of wind motors

Country Status (1)

Country Link
US (1) US1403069A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116585A (en) * 1976-11-03 1978-09-26 Mirko Maracic Self-adjusting wind machine
FR2634522A1 (en) * 1988-07-20 1990-01-26 Lafeuille Bruno Axial thrust adjustment device for a wind machine or wind generator rotor
EP0438189A1 (en) * 1990-01-08 1991-07-24 Hendrik Albert Baas Wind turbine
EP0450217A1 (en) * 1989-01-17 1991-10-09 Howden Wind Turbines Ltd Improvements relating to control of a wind turbine
US20040105752A1 (en) * 2000-12-23 2004-06-03 Aloys Wobben Rotor blade for a wind power installation
US20060045743A1 (en) * 2004-08-31 2006-03-02 Bertolotti Fabio P Foldable blades for wind turbines
US20070036657A1 (en) * 2003-04-28 2007-02-15 Aloys Wobben Rotor blade for a wind power system
US20070297896A1 (en) * 2002-06-05 2007-12-27 Aloys Wobben Rotor blade for a wind power plant
US20080121752A1 (en) * 2006-11-03 2008-05-29 Chen Franklin Y K Asymmetrically changing rotating blade shape (ACRBS) propeller and its airplane and wind turbine applications
US20090022589A1 (en) * 2005-12-29 2009-01-22 Tommy Sorensen Variable Speed Hub
US11174835B2 (en) * 2016-04-28 2021-11-16 Omegawind S.r.l. Rotor unit of a wind turbine having foldable wind blades and wind turbine comprising rotor unit
US11428204B2 (en) 2017-10-24 2022-08-30 Wobben Properties Gmbh Rotor blade of a wind turbine and method for designing same

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116585A (en) * 1976-11-03 1978-09-26 Mirko Maracic Self-adjusting wind machine
FR2634522A1 (en) * 1988-07-20 1990-01-26 Lafeuille Bruno Axial thrust adjustment device for a wind machine or wind generator rotor
EP0450217A1 (en) * 1989-01-17 1991-10-09 Howden Wind Turbines Ltd Improvements relating to control of a wind turbine
EP0438189A1 (en) * 1990-01-08 1991-07-24 Hendrik Albert Baas Wind turbine
US5183383A (en) * 1990-01-08 1993-02-02 Baas Hendrik A Wind turbine
US7204674B2 (en) * 2000-12-23 2007-04-17 Aloys Wobben Rotor blade for a wind power installation
US20040105752A1 (en) * 2000-12-23 2004-06-03 Aloys Wobben Rotor blade for a wind power installation
AU2002235802B2 (en) * 2000-12-23 2006-06-22 Aloys Wobben Rotor blade for a wind power installation
US20070297896A1 (en) * 2002-06-05 2007-12-27 Aloys Wobben Rotor blade for a wind power plant
US7708530B2 (en) 2002-06-05 2010-05-04 Aloys Wobben Rotor blade for a wind power plant
US20100232972A1 (en) * 2002-06-05 2010-09-16 Aloys Wobben Rotor blade for a wind power plant
US8100663B2 (en) 2002-06-05 2012-01-24 Aloys Wobben Rotor blade for a wind power plant
US7914261B2 (en) 2002-06-05 2011-03-29 Aloys Wobben Rotor blade for a wind power plant
US7946803B2 (en) 2003-04-28 2011-05-24 Aloys Wobben Rotor blade for a wind power system
US20070036657A1 (en) * 2003-04-28 2007-02-15 Aloys Wobben Rotor blade for a wind power system
US20060045743A1 (en) * 2004-08-31 2006-03-02 Bertolotti Fabio P Foldable blades for wind turbines
US8419362B2 (en) * 2004-08-31 2013-04-16 Hamilton Sundstrand Corporation Foldable blades for wind turbines
US20090022589A1 (en) * 2005-12-29 2009-01-22 Tommy Sorensen Variable Speed Hub
US8109733B2 (en) * 2005-12-29 2012-02-07 Lm Glasfiber A/S Variable speed hub
US7841831B2 (en) 2006-11-03 2010-11-30 Franklin Y. K. Chen Asymmetrically changing rotating blade shape (ACRBS) propeller and its airplane and wind turbine applications
US20080121752A1 (en) * 2006-11-03 2008-05-29 Chen Franklin Y K Asymmetrically changing rotating blade shape (ACRBS) propeller and its airplane and wind turbine applications
US11174835B2 (en) * 2016-04-28 2021-11-16 Omegawind S.r.l. Rotor unit of a wind turbine having foldable wind blades and wind turbine comprising rotor unit
US11428204B2 (en) 2017-10-24 2022-08-30 Wobben Properties Gmbh Rotor blade of a wind turbine and method for designing same

Similar Documents

Publication Publication Date Title
US1403069A (en) Means for regulating the speed of wind motors
US2516576A (en) Self-governing wind-driven propeller
US2439089A (en) Control of rotating wing aircraft
JPS58217704A (en) Rotor apparatus and control thereof
US5286166A (en) Automatic centrifugal force variable pitch propeller
US2023684A (en) Variable pitch propeller for aircraft
US1927966A (en) Lifting air screw for air vehicles
US2533785A (en) Variable propeller
US4443154A (en) Windmill tower shadow eliminator
US2173291A (en) Aerodynamic rotor
US2416541A (en) Variable pitch propeller
US2640553A (en) Impeller movement damping device
US1875998A (en) Propeller
US2627929A (en) Helicopter rotor
US2151172A (en) Oscillatory wind motor
US2086883A (en) Ornigyro
US2250694A (en) Mechanism for controlling the pitch of airscrew blades
US2237030A (en) Aeronautical propeller
US2075682A (en) Screw propeller
US1942100A (en) Propeller
US2244139A (en) Propeller
US2644534A (en) Automatic torque compensator
US2113478A (en) Air screw with automatically variable pitch
US1952800A (en) Automatic propeller
US2141552A (en) Variable pitch airscrew