WO2011132130A1 - Vertical axis wind turbine disguised as a tree - Google Patents

Vertical axis wind turbine disguised as a tree Download PDF

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Publication number
WO2011132130A1
WO2011132130A1 PCT/IB2011/051666 IB2011051666W WO2011132130A1 WO 2011132130 A1 WO2011132130 A1 WO 2011132130A1 IB 2011051666 W IB2011051666 W IB 2011051666W WO 2011132130 A1 WO2011132130 A1 WO 2011132130A1
Authority
WO
WIPO (PCT)
Prior art keywords
wind turbine
turbine according
stem
vanes
vane
Prior art date
Application number
PCT/IB2011/051666
Other languages
French (fr)
Inventor
Lorenzo Gaio
Original Assignee
STAMET S.p.A.
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 STAMET S.p.A. filed Critical STAMET S.p.A.
Priority to EP11722169A priority Critical patent/EP2561219A1/en
Publication of WO2011132130A1 publication Critical patent/WO2011132130A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/005—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor  the axis being vertical
    • 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
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/061—Rotors characterised by their aerodynamic shape, e.g. aerofoil profiles
    • 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
    • F05B2250/00—Geometry
    • F05B2250/70—Shape
    • 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
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction

Definitions

  • the present invention relates in general to turbines for conversion of wind energy into electrical or mechanical energy.
  • the invention regards a vertical-axis wind turbine, i.e., a turbine of the type in which a vaned rotor exposed to the current of the wind is carried by a vertical stem or upright that is able to turn for actuating a device for conversion of wind energy.
  • a vertical-axis wind turbine i.e., a turbine of the type in which a vaned rotor exposed to the current of the wind is carried by a vertical stem or upright that is able to turn for actuating a device for conversion of wind energy.
  • the rotor of the vertical-axis wind turbine has dimensions in height markedly smaller albeit with efficiencies and hence yields that are relatively more limited, basically owing to the fact that the flow of the wind at lower heights can be less intense and more disturbed .
  • the object of the present invention is to provide an original and intelligent solution to the aforesaid problem, and said purpose is achieved thanks to a vertical-axis wind turbine of the type defined above, primarily characterized in that it is configured for imitating a tree, for example a conifer, with said vanes having a rectilinear and elongated configuration with lengths that decrease progressively from a base for supporting the rotor in rotation to the top of the stem.
  • the base for supporting the wind turbine according to the invention houses the member for conversion of the wind energy into electrical or mechanical energy and is designed to be buried in the ground .
  • the wind turbine according to the invention ensures an extremely modest environmental impact on account of its more "natural” appearance, in particular as compared with that of current horizontal-axis wind turbines, and achieves a real mimetic effect which is deemed able to favour a wide diffusion thereof, for example, in sets spread in mountain or hilly environments exposed to dominant winds .
  • FIG. 1 is a schematic perspective view of a vertical-axis wind turbine according to the invention.
  • FIG. 1 is a top plan view of the turbine of Figure 1;
  • FIG. 3 is a view in elevation of the turbine of Figure 1;
  • FIG. 7 is a perspective view that shows at a larger scale one of the vanes of the wind turbine according to a first embodiment
  • FIGS. 8 and 9 are two perspective views at a larger scale that show two examples of member for attachment of each vane
  • Figure 10 is a view similar to that of Figure 7 that shows a variant of the vane, currently considered as preferred;
  • FIG. 11 is an exploded view of the vane of Figure 10;
  • FIG. 12 is a sectioned perspective view at a larger scale of a part of the vane of Figure 10;
  • FIG. 13 is a perspective view that shows at a larger scale the free end of the vane of Figure 10;
  • FIG. 14 is a sectioned perspective view at a larger scale that shows some alternative solutions for the transverse diaphragms of the vane of Figure 10;
  • Figure 15 is a schematic top plan view, similar to that of Figure 2, which shows the vertical-axis wind turbine according to the invention provided with vanes according to Figures 10 to 13;
  • FIG. 16 is an exploded perspective view of the supporting base of the vertical-axis wind turbine according to the invention.
  • the wind turbine basically comprises a base 1 that supports in rotation a vertical stem 2, which defines the axis of rotation of the wind turbine.
  • the base 1 is pre-arranged for being completely buried in the ground S in the site where the wind turbine is installed so as to be invisible and thus minimize the environmental impact during use of the turbine, albeit ensuring ease of access if need be, for example for possible maintenance operations.
  • the bottom end of the stem 2 is operatively associated to a converter of wind energy into electrical or mechanical energy, for example - as in the case of the embodiment described herein - to an electric generator 3.
  • the stem 2 carries a plurality of sets of vanes 4 rigidly fixed orthogonal to the stem 2.
  • the vanes 4 have a rectilinear configuration, i.e., they are directed radially with respect to the stem 2, and extend with progressively decreasing lengths from the base 1 to the top of the stem 2.
  • the longer vanes 4 are hence the ones closest to the base 1, whereas the shorter vanes 4 are those positioned at the top of the stem 2.
  • each set of vanes comprises a plurality of vanes 4 of the same length (in the case of the example illustrated in Figures 1-3, twelve in number) set at the same angular distances apart .
  • the wind turbine according to the invention is effectively configured so as to imitate a tree, and more in particular a conifer such as a fair or a pine.
  • the vanes 4 may be painted green.
  • Figures 4 and 5 are schematic illustrations of other examples of tree-like configurations of the wind turbine according to the invention, which differ from one another and with respect to the embodiment of Figures 1 to 3 as regards a different conformation and distribution of the corresponding vanes 4, which in any case are once again rectilinear and extend with progressively decreasing lengths from beneath upwards.
  • each vane 4 can be simply formed starting from a tubular body, for example with circular cross section and possibly tapered in a longitudinal direction, cut longitudinally so as to present a concave front 5 and a convex back 6.
  • the proximal end of the body of the vane 4 carries an end disk 7, projecting from which is an axial shank (not visible) rigidly fixed on which is an attachment member 8 for connection to similar attachment members of the other vanes 4 of the same set around the stem 2.
  • Figures 8 and 9 show two examples of the attachment member 8 respectively in the case where the set includes just two diametrally opposite vanes and in the case of three vanes arranged at 120° apart.
  • the attachment member 8 includes a hollow body 9 for fixing on the shank projecting from the end disk 7, and two side appendages 10 that are flange-shaped so as to mate with the corresponding appendages 10 of the attachment members 8 of the contiguous vanes 4 in order to be then fixed together via screws inserted within respective holes- 11. In this way, each set of vanes 4 is rigidly fixed around the stem 2.
  • Figures 10 to 13 show a variant of the body of each vane, designated by 4a, currently considered as the preferred embodiment.
  • the vane body 4a which is also rectilinear, elongated and formed with a concave front 5 and a convex back 6, has an elliptical cross section generally constant throughout its length.
  • transverse diaphragms in the form of fins 14 set at a distance apart along the extension of the vane 4a.
  • Said transverse diaphragms 14 have a shape and profile complementary to those of the concavity 5 and are fixed within the vane body 4a, for example via riveting (as may be seen in greater detail in Figure 12) in such a way as to project on the outside of its concavity 5.
  • the transverse diaphragms 14 and 15 are oriented obliquely with respect to the vane body 4a so as to form with the longitudinal direction thereof an angle, measured from the side of the stem 2, greater than 90°, as represented schematically in Figure 15.
  • This advantageously makes it possible to exploit to the full the force of the wind also when the angle formed between its direction and each vane 4a in rotation is greater than 90°.
  • the transverse diaphragms 14 may present different profiles, in particular each time designed from the fluid-dynamic standpoint according to the speed and intensity of the dominant winds in the areas in which the vertical-axis wind turbine according to the invention is to be installed. Examples of said alternative profiles are represented schematically and designated by 14a, 14b and 14c in Figure 14.
  • Figure 16 shows that it typically comprises a base plate 16 resting on which are two spacers 17 for supporting a support 18 for a container 19, housed within which is the energy-conversion device, which in the case represented here is constituted by a power takeoff 3 for driving, for example, a hydraulic pump.
  • the vertical stem 2 of the wind turbine traverses a tubular support 20 fixed to a top plate 21 and actuates' the power takeoff 3 through a coupling joint 22.

Abstract

A vertical-axis wind turbine having a rotor including a vertical stem (2) and a plurality of sets of vanes (4a) fixed orthogonal to the stem (2). The turbine is configured to imitate a tree, with the vanes (4) having a rectilinear and elongated configuration with lengths progressively decreasing from a base (1), which contains a wind-energy conversion device (3) and is designed in use to be buried in the ground, towards the top of the stem (2).

Description

VERTICAL AXIS WIND TURBINE DISGUISED AS A TREE
Field of the invention
The present invention relates in general to turbines for conversion of wind energy into electrical or mechanical energy.
More in particular, the invention regards a vertical-axis wind turbine, i.e., a turbine of the type in which a vaned rotor exposed to the current of the wind is carried by a vertical stem or upright that is able to turn for actuating a device for conversion of wind energy.
Prior art
Examples of vertical-axis wind turbines of the above sort are described and illustrated, for example, in the patent documents Nos . US-4365934, US-6379115 and WO-2008/127751.
As compared to horizontal-axis wind turbines, typically constituted by a vertical column some tens of metres high bearing at the top a propeller of large dimensions, the rotor of the vertical-axis wind turbine has dimensions in height markedly smaller albeit with efficiencies and hence yields that are relatively more limited, basically owing to the fact that the flow of the wind at lower heights can be less intense and more disturbed .
Notwithstanding the reduced dimensions, vertical- axis wind turbines present, however, a certain environmental impact that is barely compatible with the possibility and also the need for a large-scale diffusion thereof as current impulse to recourse to renewable energy sources would require.
An attempt to provide a solution to said problem is suggested by the document No. WO-2009/075865, regarding a vertical-axis wind turbine the rotor of which, including a rotatable vertical stem and a plurality of sets of fixed vanes orthogonal to the stem, is described as having a conical, frustoconical or irregular configuration to provide a tree-like appearance. Taking into account the fact that the vanes of the turbine provided in this document are expressly of the Savonius or Diarieus type, i.e., with a markedly curved conformation, the result that can be achieved also with a conical, frustoconical, or irregular conformation of the rotor may not in effect correspond or be equivalent to what of a natural tree. Summary of the invention
The object of the present invention is to provide an original and intelligent solution to the aforesaid problem, and said purpose is achieved thanks to a vertical-axis wind turbine of the type defined above, primarily characterized in that it is configured for imitating a tree, for example a conifer, with said vanes having a rectilinear and elongated configuration with lengths that decrease progressively from a base for supporting the rotor in rotation to the top of the stem.
Conveniently, the base for supporting the wind turbine according to the invention houses the member for conversion of the wind energy into electrical or mechanical energy and is designed to be buried in the ground .
Thanks to this idea of solution the wind turbine according to the invention ensures an extremely modest environmental impact on account of its more "natural" appearance, in particular as compared with that of current horizontal-axis wind turbines, and achieves a real mimetic effect which is deemed able to favour a wide diffusion thereof, for example, in sets spread in mountain or hilly environments exposed to dominant winds .
Brief description of the drawings
The invention will now be described in detail with reference to the annexed drawings, which are provided purely by way of non-limiting example, and in which:
- Figure 1 is a schematic perspective view of a vertical-axis wind turbine according to the invention;
- Figure 2 is a top plan view of the turbine of Figure 1;
- Figure 3 is a view in elevation of the turbine of Figure 1;
- Figures 4, 5, and 6 are schematic perspective views of three respective variants of the vertical-axis wind turbine according to the invention;
- Figure 7 is a perspective view that shows at a larger scale one of the vanes of the wind turbine according to a first embodiment;
- Figures 8 and 9 are two perspective views at a larger scale that show two examples of member for attachment of each vane;
- Figure 10 is a view similar to that of Figure 7 that shows a variant of the vane, currently considered as preferred;
- Figure 11 is an exploded view of the vane of Figure 10;
- Figure 12 is a sectioned perspective view at a larger scale of a part of the vane of Figure 10;
- Figure 13 is a perspective view that shows at a larger scale the free end of the vane of Figure 10;
- Figure 14 is a sectioned perspective view at a larger scale that shows some alternative solutions for the transverse diaphragms of the vane of Figure 10;
- Figure 15 is a schematic top plan view, similar to that of Figure 2, which shows the vertical-axis wind turbine according to the invention provided with vanes according to Figures 10 to 13; and
- Figure 16 is an exploded perspective view of the supporting base of the vertical-axis wind turbine according to the invention.
Detailed description of the invention
With initial reference to Figures 1 to 3, the wind turbine according to the invention basically comprises a base 1 that supports in rotation a vertical stem 2, which defines the axis of rotation of the wind turbine.
According to a first peculiar aspect of the invention, the base 1 is pre-arranged for being completely buried in the ground S in the site where the wind turbine is installed so as to be invisible and thus minimize the environmental impact during use of the turbine, albeit ensuring ease of access if need be, for example for possible maintenance operations.
As will be further clarified in what follows, the bottom end of the stem 2 is operatively associated to a converter of wind energy into electrical or mechanical energy, for example - as in the case of the embodiment described herein - to an electric generator 3.
From the area overlying the base 1, and up to its top, the stem 2 carries a plurality of sets of vanes 4 rigidly fixed orthogonal to the stem 2. According to a peculiar characteristic of the invention, the vanes 4 have a rectilinear configuration, i.e., they are directed radially with respect to the stem 2, and extend with progressively decreasing lengths from the base 1 to the top of the stem 2. The longer vanes 4 are hence the ones closest to the base 1, whereas the shorter vanes 4 are those positioned at the top of the stem 2.
As is illustrated in Figure 2, each set of vanes comprises a plurality of vanes 4 of the same length (in the case of the example illustrated in Figures 1-3, twelve in number) set at the same angular distances apart .
With said arrangement, the wind turbine according to the invention is effectively configured so as to imitate a tree, and more in particular a conifer such as a fair or a pine. In order to render said imitation even more effective, the vanes 4 may be painted green.
Figures 4 and 5 are schematic illustrations of other examples of tree-like configurations of the wind turbine according to the invention, which differ from one another and with respect to the embodiment of Figures 1 to 3 as regards a different conformation and distribution of the corresponding vanes 4, which in any case are once again rectilinear and extend with progressively decreasing lengths from beneath upwards.
In the case of the further variant of Figure 6, the corresponding ends of the vanes 4 (similar to those of the wind turbine of Figures 1 to 3) of the various sets are joined together via cables or stays 12 anchored at the top to a disk 13 fixed to the top of the stem 2. This arrangement bestows on the vanes 4 a greater structural stability.
With reference now in detail to Figure 7, in a first embodiment each vane 4 can be simply formed starting from a tubular body, for example with circular cross section and possibly tapered in a longitudinal direction, cut longitudinally so as to present a concave front 5 and a convex back 6.
The proximal end of the body of the vane 4 carries an end disk 7, projecting from which is an axial shank (not visible) rigidly fixed on which is an attachment member 8 for connection to similar attachment members of the other vanes 4 of the same set around the stem 2.
Figures 8 and 9 show two examples of the attachment member 8 respectively in the case where the set includes just two diametrally opposite vanes and in the case of three vanes arranged at 120° apart. In both cases, the attachment member 8 includes a hollow body 9 for fixing on the shank projecting from the end disk 7, and two side appendages 10 that are flange-shaped so as to mate with the corresponding appendages 10 of the attachment members 8 of the contiguous vanes 4 in order to be then fixed together via screws inserted within respective holes- 11. In this way, each set of vanes 4 is rigidly fixed around the stem 2.
Figures 10 to 13 show a variant of the body of each vane, designated by 4a, currently considered as the preferred embodiment. In this case, the vane body 4a, which is also rectilinear, elongated and formed with a concave front 5 and a convex back 6, has an elliptical cross section generally constant throughout its length. Arranged within its concavity are transverse diaphragms in the form of fins 14 set at a distance apart along the extension of the vane 4a. Said transverse diaphragms 14 have a shape and profile complementary to those of the concavity 5 and are fixed within the vane body 4a, for example via riveting (as may be seen in greater detail in Figure 12) in such a way as to project on the outside of its concavity 5.
The distal end of the vane body 4a opposite to the attachment member 8, i.e., its free end, is closed by a terminal transverse diaphragm 15 slightly curved (as is represented in greater detail in Figure 13) with concavity facing the attachment member 8.
Preferably, the transverse diaphragms 14 and 15 are oriented obliquely with respect to the vane body 4a so as to form with the longitudinal direction thereof an angle, measured from the side of the stem 2, greater than 90°, as represented schematically in Figure 15. This advantageously makes it possible to exploit to the full the force of the wind also when the angle formed between its direction and each vane 4a in rotation is greater than 90°.
The transverse diaphragms 14 may present different profiles, in particular each time designed from the fluid-dynamic standpoint according to the speed and intensity of the dominant winds in the areas in which the vertical-axis wind turbine according to the invention is to be installed. Examples of said alternative profiles are represented schematically and designated by 14a, 14b and 14c in Figure 14.
To return to the base buried in the ground 1,
Figure 16 shows that it typically comprises a base plate 16 resting on which are two spacers 17 for supporting a support 18 for a container 19, housed within which is the energy-conversion device, which in the case represented here is constituted by a power takeoff 3 for driving, for example, a hydraulic pump. The vertical stem 2 of the wind turbine traverses a tubular support 20 fixed to a top plate 21 and actuates' the power takeoff 3 through a coupling joint 22.
Of course, the details of construction and the embodiments may vary widely with respect to what is described and illustrated herein, without thereby departing from the scope of the present invention as defined in the ensuing claims.

Claims

1. A vertical-axis wind turbine comprising a rotor for driving an energy-conversion device (3), including a rotatable vertical stem (2) and a plurality of sets of vanes (4; 4a) fixed orthogonal to the stem (2), said wind turbine being characterized in that it is configured so as to imitate a tree with said vanes (4; 4a) having a rectilinear and elongated configuration with lengths progressively decreasing from a base (1) supporting in rotation the rotor to the top of the stem (2) .
2. The wind turbine according to Claim 1, characterized in that said supporting base (1) houses said energy-conversion device (3) and is designed to be buried in use in the ground.
3. The wind turbine according to Claim 1 or Claim 2, characterized in that it has substantially the shape of a conifer.
4. The wind turbine according to any one of Claims 1 to 3, characterized in that each set comprises a plurality of vanes (4; 4a) set at one and the same angular distance apart.
5. The wind turbine according to Claim 4, characterized in that each vane (4; 4a) consists of a concave-convex body (5, 6) .
6. The wind turbine according to Claim 5, characterized in that said vane body (4a) has an elliptical cross section.
7. The wind turbine according to Claim 5 or Claim 6, characterized in that set within the concavity (5) of said vane body (4a) are transverse diaphragms (14; 14a; 14b; 14c) set at a distance apart along the extension of the vane.
8. The wind turbine according to Claim 7, characterized in that said transverse diaphragms (14; 14a; 14b; 14c) project on the outside of the concavity (5) of the vane body (4a) .
9. The wind turbine according to Claim 7 or Claim 8, characterized in that a terminal transverse diaphragm (15) is set at the distal end of the vane body (4) opposite to said stem (2) .
10. The wind turbine according to Claim 9, characterized in that said terminal transverse diaphragm (15) is curved with concavity facing said stem (2 ) .
11. The wind turbine according to any one of Claims 7 to 10, characterized in that said transverse diaphragms (14; 14a; 14b; 14c; 15) are oriented obliquely with respect to the longitudinal direction of said vane body (4a) .
12. The wind turbine according to Claim 11, characterized in that said transverse diaphragms (14; 14a; 14b; 14c; 15) form with the longitudinal direction of said vane body (4a) an angle greater than 90° measured on the side of said stem (2).
13. The wind turbine according to any one of the preceding claims, characterized in that each vane (4; 4a) is provided at its proximal end (7) facing said stem (2) with an attachment member (8) for fixing to contiguous vanes (4; 4a) of the same set around said stem (2) .
14. The wind turbine according to any one of the preceding claims, characterized in that the free ends of the vanes (4) of each set are connected to the free ends of the corresponding vanes of the other sets via cables or stays (12) anchored at the top to the top (13) of the stem (2) .
15. The wind turbine according to any one of the preceding claims, characterized in that the wind-energy conversion device is chosen between an electric generator and a mechanical actuator (3).
PCT/IB2011/051666 2010-04-19 2011-04-18 Vertical axis wind turbine disguised as a tree WO2011132130A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11722169A EP2561219A1 (en) 2010-04-19 2011-04-18 Vertical axis wind turbine disguised as a tree

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2010A000317A IT1399974B1 (en) 2010-04-19 2010-04-19 WIND TURBINE WITH VERTICAL AXIS
ITTO2010A000317 2010-04-19

Publications (1)

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WO2011132130A1 true WO2011132130A1 (en) 2011-10-27

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EP (1) EP2561219A1 (en)
IT (1) IT1399974B1 (en)
WO (1) WO2011132130A1 (en)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
AT511692B1 (en) * 2011-11-11 2013-02-15 Cuba Norbert TURBINE, ESPECIALLY WIND TURBINE
WO2013136142A1 (en) 2012-03-14 2013-09-19 Newwind Aerogenerator comprising a trunk and a plurality of branches extending from this trunk
FR2999246A1 (en) * 2012-12-06 2014-06-13 Jean Marc Armbruster Device for generating wind energy in e.g. urban environment, has wind turbines located at different heights and/or distance, and vibration damping element arranged at fixing support of each wind turbine
JP5877458B1 (en) * 2015-07-15 2016-03-08 かしま野管理サービス株式会社 Wind tunnel rotating blade

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KR100999320B1 (en) * 2010-04-23 2010-12-08 손정희 Wind blade for wind generator and manufacturing method thereof
KR20110004113A (en) * 2009-07-07 2011-01-13 허정 Perpendicular rotator of hydraulic generator or aerogenerator

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Publication number Priority date Publication date Assignee Title
US4365934A (en) 1981-06-15 1982-12-28 Mason H Carl Wind machine
EP0364020A1 (en) * 1988-10-03 1990-04-18 Josef Moser Rotor for a wind motor
US6379115B1 (en) 1999-08-02 2002-04-30 Tetsuo Hirai Windmill and windmill control method
WO2007076837A2 (en) * 2005-12-23 2007-07-12 Lars Gunnar Liebchen Multipart wind power, ocean current power extraction plant
WO2008127751A2 (en) 2007-01-22 2008-10-23 Lonestar Inventions Lp High efficiency turbine with variable attack angle foils
JP2009002214A (en) * 2007-06-21 2009-01-08 Seven Stars Worldwide Ltd Automatic wind direction tracking wind turbine of air power type
WO2009075865A2 (en) 2007-12-11 2009-06-18 Vinci-Tech Inc. Vertical axis wind turbine with blades for redirecting airflow
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT511692B1 (en) * 2011-11-11 2013-02-15 Cuba Norbert TURBINE, ESPECIALLY WIND TURBINE
AT511692A4 (en) * 2011-11-11 2013-02-15 Cuba Norbert TURBINE, ESPECIALLY WIND TURBINE
WO2013136142A1 (en) 2012-03-14 2013-09-19 Newwind Aerogenerator comprising a trunk and a plurality of branches extending from this trunk
US20150108762A1 (en) * 2012-03-14 2015-04-23 Newwind Aerogenerator Comprising a Trunk and a Plurality of Branches Extending From This Trunk
FR2999246A1 (en) * 2012-12-06 2014-06-13 Jean Marc Armbruster Device for generating wind energy in e.g. urban environment, has wind turbines located at different heights and/or distance, and vibration damping element arranged at fixing support of each wind turbine
JP5877458B1 (en) * 2015-07-15 2016-03-08 かしま野管理サービス株式会社 Wind tunnel rotating blade

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ITTO20100317A1 (en) 2011-10-20
EP2561219A1 (en) 2013-02-27
IT1399974B1 (en) 2013-05-09

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