CA2395612C - Wind power installation with two rotors in tandem - Google Patents
Wind power installation with two rotors in tandem Download PDFInfo
- Publication number
- CA2395612C CA2395612C CA002395612A CA2395612A CA2395612C CA 2395612 C CA2395612 C CA 2395612C CA 002395612 A CA002395612 A CA 002395612A CA 2395612 A CA2395612 A CA 2395612A CA 2395612 C CA2395612 C CA 2395612C
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- wind power
- power installation
- set forth
- blade
- 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
Links
- 238000009434 installation Methods 0.000 title claims abstract description 50
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/02—Wind motors with rotation axis substantially parallel to the air flow entering the rotor having a plurality of rotors
- F03D1/025—Wind motors with rotation axis substantially parallel to the air flow entering the rotor having a plurality of rotors coaxially arranged
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/0608—Rotors characterised by their aerodynamic shape
- F03D1/0633—Rotors characterised by their aerodynamic shape of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- 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
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
-
- 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
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/21—Rotors for wind turbines
- F05B2240/221—Rotors for wind turbines with horizontal axis
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention concerns a wind power installation, in particular a large-scale wind power installation with an output power of more than two MW, preferably about five MW or more In accordance with the invention, for a large-scale wind power installation of that kind, there is proposed a rotor design and the configuration of corresponding rotor blades, so that reliable operation of such a wind power installation is possible.
While such a rotor blade which is optimised for a maximum degree of efficiency is good to produce for relatively small installations and can also be transported without any problem, such a rotor blade design suffers from two disadvantages. Firstly, the very large area of the rotor blade at the rotor blade root gives rise to very high loads when high wind speeds are involved. The wind power installation is usually then already shut down. However, the entire wind power installation has to be designed (dimensioned) for those very high loads. The second disadvantage lies in production of a rotor blade involving a very great blade depth.
The object of the invention is to eliminate the above-indicated problems and to simplify the production of a wind power installation and the operation thereof.
A wind power installation comprising at least two rotors which are arranged one behind the other and of which the first rotor which is arranged in front of the second rotor is of a smaller diameter than the second rotor.
While such a rotor blade which is optimised for a maximum degree of efficiency is good to produce for relatively small installations and can also be transported without any problem, such a rotor blade design suffers from two disadvantages. Firstly, the very large area of the rotor blade at the rotor blade root gives rise to very high loads when high wind speeds are involved. The wind power installation is usually then already shut down. However, the entire wind power installation has to be designed (dimensioned) for those very high loads. The second disadvantage lies in production of a rotor blade involving a very great blade depth.
The object of the invention is to eliminate the above-indicated problems and to simplify the production of a wind power installation and the operation thereof.
A wind power installation comprising at least two rotors which are arranged one behind the other and of which the first rotor which is arranged in front of the second rotor is of a smaller diameter than the second rotor.
Description
Wind power installation The invention concerns a wind power installation, in particular a large-scale wind power installation with an output power of more than two MW, preferably about five MW or more In accordance with the invention, for a large-scale wind power installation of that kind, there is proposed a rotor design and the configuration of corresponding rotor blades, so that reliable operation of such a wind power installation is possible.
In that respect it should be pointed out that it is already state of the art (Erich Hau, "Windkraftanlagen" ("Wind Power Installations"), 1996, 2nd edition, page 113 ff) for a rotor blade which is optimised for a maximum degree of efficiency to be provided in the inner region with very great blade depths. Such rotor blades are used for example by Enercon in the wind power installation of type E-40 (power range is between 500 and 600 KW). The inner region of a rotor blade is in that respect that portion which is close to the hub (rotor blade root) and accordingly involves a small radius.
While such a rotor blade which is optimised for a maximum degree of efficiency is good to produce for relatively small installations and can also be transported without any problem, such a rotor blade design suffers from two disadvantages. Firstly, the very large area of the rotor blade at the rotor blade root gives rise to very high loads when high wind speeds are involved. The wind power installation is usually then already shut down. However, the entire wind power installation has to be designed (dimensioned) for those very high loads. The second disadvantage lies in production of a rotor blade involving a very great blade depth. While that disadvantage is still scarcely significant in relation to rotor blades of a relatively small radius, manufacture and subsequent transportation of such a rotor blade which is of a very great length (for example more than 50 m) is highly complicated and in part impossible and the very great blade depth entails an extremely great increase in material and labour.
For those reasons the proposal has been made to circumvent the great blade depths. Figure 2 shows a design configuration which was earlier frequently built in Denmark.
In this embodiment of a rotor blade, the inner region was completely eliminated. As the harvest area corresponds to the rotor area which is swept, it was assumed that it was possible to forego that very small area (inner region area) which only corresponds to about 5% of the total area, or to slightly enlarge the rotor diameter in order thereby to compensate for the area flaw.
In that respect however the point was overlooked or not noted that this results in the formation of an aerodynamic hole in the near region of the wind power installation with rotor blades as shown in Figure 2. In the near region the wind can flow unimpededly through that hole without experiencing any resistance. The result of this is that no laminar flow is built up in the inner region (first region of the rotor of the wind power sII
In that respect it should be pointed out that it is already state of the art (Erich Hau, "Windkraftanlagen" ("Wind Power Installations"), 1996, 2nd edition, page 113 ff) for a rotor blade which is optimised for a maximum degree of efficiency to be provided in the inner region with very great blade depths. Such rotor blades are used for example by Enercon in the wind power installation of type E-40 (power range is between 500 and 600 KW). The inner region of a rotor blade is in that respect that portion which is close to the hub (rotor blade root) and accordingly involves a small radius.
While such a rotor blade which is optimised for a maximum degree of efficiency is good to produce for relatively small installations and can also be transported without any problem, such a rotor blade design suffers from two disadvantages. Firstly, the very large area of the rotor blade at the rotor blade root gives rise to very high loads when high wind speeds are involved. The wind power installation is usually then already shut down. However, the entire wind power installation has to be designed (dimensioned) for those very high loads. The second disadvantage lies in production of a rotor blade involving a very great blade depth. While that disadvantage is still scarcely significant in relation to rotor blades of a relatively small radius, manufacture and subsequent transportation of such a rotor blade which is of a very great length (for example more than 50 m) is highly complicated and in part impossible and the very great blade depth entails an extremely great increase in material and labour.
For those reasons the proposal has been made to circumvent the great blade depths. Figure 2 shows a design configuration which was earlier frequently built in Denmark.
In this embodiment of a rotor blade, the inner region was completely eliminated. As the harvest area corresponds to the rotor area which is swept, it was assumed that it was possible to forego that very small area (inner region area) which only corresponds to about 5% of the total area, or to slightly enlarge the rotor diameter in order thereby to compensate for the area flaw.
In that respect however the point was overlooked or not noted that this results in the formation of an aerodynamic hole in the near region of the wind power installation with rotor blades as shown in Figure 2. In the near region the wind can flow unimpededly through that hole without experiencing any resistance. The result of this is that no laminar flow is built up in the inner region (first region of the rotor of the wind power sII
installation) of the beginning profile at the rotor blade. That also means that the first region of the rotor blade with an (active) rotor profiling cannot contribute to energy generation.
Enercon already developed at a very early date (about 1990) thick, cut-off profiles in order to get around the above-indicated problems.
Figure 3 shows such a profile which was used in the inner region of the rotor blade. In the case of large wind power installations (rotor diameters of over 70m) however even the cut-off profiles result in blade depths of up to 6m, which makes transportation of such rotor blades 1o extremely difficult and makes the manufacture thereof extraordinarily .complicated and expensive.
The object of the invention is to eliminate the above-indicated problems and to simplify the manufacture of a wind power installation and the operation thereof.
The invention attains that object with the features of a wind power installation as set forth in claim 1. Advantageous developments are set forth in the appendant claims.
The concept of the wind power installation in accordance with the invention involves providing the wind power installation with two rotors of which the first, the small rotor, is arranged in front of the second, the larger rotor. Accordingly it is proposed in accordance with the invention that the inner region of the rotor of a wind power installation is completely separated from the outer region.
Such a wind power installation is described by way of example with reference to the Figures hereinafter. In this respect the model adopted for the description is a large-scale wind power installation involving a diameter of about 113m and an installed generator output of about 5 MW.
The rotor for the inner region is in this case of about 40m in diameter.
Accordingly, for the second rotor, the larger rotor, there still remains an active rotor blade length of about 36.5m. The first small rotor rotates at a nominal speed of about 38 rpm. The second large rotor .,.
Enercon already developed at a very early date (about 1990) thick, cut-off profiles in order to get around the above-indicated problems.
Figure 3 shows such a profile which was used in the inner region of the rotor blade. In the case of large wind power installations (rotor diameters of over 70m) however even the cut-off profiles result in blade depths of up to 6m, which makes transportation of such rotor blades 1o extremely difficult and makes the manufacture thereof extraordinarily .complicated and expensive.
The object of the invention is to eliminate the above-indicated problems and to simplify the manufacture of a wind power installation and the operation thereof.
The invention attains that object with the features of a wind power installation as set forth in claim 1. Advantageous developments are set forth in the appendant claims.
The concept of the wind power installation in accordance with the invention involves providing the wind power installation with two rotors of which the first, the small rotor, is arranged in front of the second, the larger rotor. Accordingly it is proposed in accordance with the invention that the inner region of the rotor of a wind power installation is completely separated from the outer region.
Such a wind power installation is described by way of example with reference to the Figures hereinafter. In this respect the model adopted for the description is a large-scale wind power installation involving a diameter of about 113m and an installed generator output of about 5 MW.
The rotor for the inner region is in this case of about 40m in diameter.
Accordingly, for the second rotor, the larger rotor, there still remains an active rotor blade length of about 36.5m. The first small rotor rotates at a nominal speed of about 38 rpm. The second large rotor .,.
rotates at a nominal speed of 11 rpm. That means that the peripheral speeds of the rotor blade tips of the two rotors are almost the same.
The advantage of the wind power installation according to the invention is that only a very small engagement surface presents itself in relation to high wind speeds, for the inner region of the rotor. Accordingly the extreme loadings on the entire wind power installation are very much lower.
A further advantage is that the rotor blade for the outer region (the second rotor) can be produced as a unit of a length of about 36.5m. Such 1o a rotor blade can be fitted onto a rotor blade stump which aerodynamically no longer provides any relevant contribution to driving the rotor. That means that transportation of the rotor blades is readily possible.
A further advantage is also that the rotor blade adjusting device of the second rotor no longer has to be so large in design as the rotor blade adjusting device can be fitted (mounted) on the rotor blade stump and accordingly is about 20m (radius of the small rotor) away from the hub.
In operation of the wind power installation each rotor drives its own generator. The generator of the first rotor is disposed between the first and second rotors and is preferably driven directly by it. In regard to the 2o design structure of the wind power installation according to the invention, this means that a rotor-generator arrangement of relatively small type, for example of type E-40 from Enercon, is placed in front of the second rotor.
In that case both rotors and both generators are carried by a single trunnion and are mounted rotatably thereon.
Preferably both rotors rotate in the same direction (clockwise), but it is also possible if the rotor blades are of a suitable design configuration for the rotors to be caused to rotate in opposite directions.
The pylon of the wind power installation according to the invention is more than 100m in height, for example the hub height is in the region of between 120 and 160m.
in S
In operation of the wind power installation the smaller rotor (the first rotor) provides that no aerodynamic hole can be formed in the inner region of the second rotor.
The advantage of the wind power installation according to the invention is that only a very small engagement surface presents itself in relation to high wind speeds, for the inner region of the rotor. Accordingly the extreme loadings on the entire wind power installation are very much lower.
A further advantage is that the rotor blade for the outer region (the second rotor) can be produced as a unit of a length of about 36.5m. Such 1o a rotor blade can be fitted onto a rotor blade stump which aerodynamically no longer provides any relevant contribution to driving the rotor. That means that transportation of the rotor blades is readily possible.
A further advantage is also that the rotor blade adjusting device of the second rotor no longer has to be so large in design as the rotor blade adjusting device can be fitted (mounted) on the rotor blade stump and accordingly is about 20m (radius of the small rotor) away from the hub.
In operation of the wind power installation each rotor drives its own generator. The generator of the first rotor is disposed between the first and second rotors and is preferably driven directly by it. In regard to the 2o design structure of the wind power installation according to the invention, this means that a rotor-generator arrangement of relatively small type, for example of type E-40 from Enercon, is placed in front of the second rotor.
In that case both rotors and both generators are carried by a single trunnion and are mounted rotatably thereon.
Preferably both rotors rotate in the same direction (clockwise), but it is also possible if the rotor blades are of a suitable design configuration for the rotors to be caused to rotate in opposite directions.
The pylon of the wind power installation according to the invention is more than 100m in height, for example the hub height is in the region of between 120 and 160m.
in S
In operation of the wind power installation the smaller rotor (the first rotor) provides that no aerodynamic hole can be formed in the inner region of the second rotor.
Claims (14)
1. A wind power installation comprising at least two rotors which are arranged for rotation about a common axis, with a first rotor located in front of a second rotor, the first rotor having a smaller diameter than the second rotor, characterised in that a nominal speed of rotation of the first rotor is greater than a nominal speed of rotation of the second rotor such that a peripheral speed of rotor blade tips of both rotors is approximately equal in nominal operation.
2. A wind power installation as set forth in claim 1 characterised in that the nominal rotary speed of the first rotor is approximately in the range of between 25 and 45 rpm.
3. A wind power installation as set forth in claim 1 or claim 2 characterised in that the nominal rotary speed of the second rotor is approximately in the range of between 5 and 19 rpm.
4. A wind power installation as set forth in any one of claims 1 to 3 characterised in that a respective generator is associated with each rotor.
5. A wind power installation as set forth in any one of claims 1 to 4 characterised in that the first rotor is of a diameter of between about 35 and 55m and the second rotor is of a diameter of between about 100 and 150m.
6. A wind power installation as set forth in claim 5 wherein the diameter of the second rotor is about 113m.
7. A wind power installation comprising a first and a second rotor, wherein the second rotor is of a larger diameter than the first rotor and is arranged behind the first rotor and the second rotor has rotor blades whose active blade areas begin only in the region of the rotor blade tips of the first rotor, characterised in that a nominal speed of rotation of the first rotor is greater than a nominal speed of rotation of the second rotor such that a peripheral speed of rotor blade tips of both rotors is approximately equal in nominal operation.
8. A wind power installation as set forth in any one of claims 1 to 7 characterised in that the second rotor has rotor blades which comprise an outer portion and an inner portion, wherein the outer portion of each rotor blade forms an active rotor blade and the inner portion of each rotor blade is aerodynamically such that it makes no relevant contribution to driving the second rotor.
9. A wind power installation as set forth in claim 8 characterised in that a rotor blade adjusting device is provided for the rotor blade of the second rotor, said rotor blade adjusting device being between the inner and outer portions of the second rotor blade.
10. A wind power installation as set forth in claim 8 or claim 9 characterised in that the inner portion of the rotor blade of the second rotor is fixed rigidly to a hub of the second rotor.
11. A wind power installation comprising a first rotor and a second rotor, the first rotor having blades in an inner region and the second rotor having blades in an outer region, wherein the inner region is separated from the outer region, and wherein a nominal speed of rotation of the first rotor is greater than a nominal speed of rotation of the second rotor such that a peripheral speed of rotor blade tips of both rotors is approximately equal in nominal operation.
12. A wind power installation as set forth in any one of claims 1 to 11 characterised in that arranged between the first rotor and the second rotor is a first generator with a generator rotor connected to the first rotor and driven thereby.
13. A wind power installation as set forth in any one of claims 1 to 12 characterised in that the first rotor is arranged so closely in front of the second rotor that no aerodynamic hole can be formed in the region of the second rotor.
14. A wind power installation as set forth in any one of claims 1 to 13 characterised in that both rotors rotate in the same direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10003385A DE10003385A1 (en) | 2000-01-26 | 2000-01-26 | Wind turbine |
| DE10003385.7 | 2000-01-26 | ||
| PCT/EP2000/011218 WO2001055590A1 (en) | 2000-01-26 | 2000-11-14 | Wind power installation with two rotors in tandem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2395612A1 CA2395612A1 (en) | 2001-08-02 |
| CA2395612C true CA2395612C (en) | 2004-06-22 |
Family
ID=7628824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002395612A Expired - Lifetime CA2395612C (en) | 2000-01-26 | 2000-11-14 | Wind power installation with two rotors in tandem |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US7074011B1 (en) |
| EP (1) | EP1255931B1 (en) |
| JP (2) | JP2003526757A (en) |
| KR (2) | KR20020067935A (en) |
| AT (1) | ATE298840T1 (en) |
| AU (1) | AU758742B2 (en) |
| BR (1) | BR0017014B1 (en) |
| CA (1) | CA2395612C (en) |
| DE (2) | DE10003385A1 (en) |
| DK (1) | DK1255931T3 (en) |
| ES (1) | ES2242647T3 (en) |
| PT (1) | PT1255931E (en) |
| WO (1) | WO2001055590A1 (en) |
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| CA2477595A1 (en) * | 2004-08-23 | 2006-02-23 | Alfred L. Mathieu | An auxiliary propeller rotor for horizontal wind turbine generators |
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| GB0516149D0 (en) * | 2005-08-05 | 2005-09-14 | Univ Strathclyde | Turbine |
| DK176317B1 (en) | 2005-10-17 | 2007-07-30 | Lm Glasfiber As | Blade for a rotor on a wind turbine |
| US20070205603A1 (en) * | 2006-03-03 | 2007-09-06 | Karl Appa | Methods and devices for improving efficiency of wind turbines in low wind speed sites |
| EP2107235A1 (en) * | 2008-04-02 | 2009-10-07 | Lm Glasfiber A/S | A wind turbine blade with an auxiliary airfoil |
| CN101457736A (en) * | 2008-09-05 | 2009-06-17 | 张云龙 | Composite rotor system of wind motor |
| EA016290B1 (en) * | 2008-12-01 | 2012-03-30 | Омир Каримович БАЯЛИЕВ | Wind electric generating plant |
| WO2010087178A1 (en) * | 2009-01-30 | 2010-08-05 | 国立大学法人九州工業大学 | Wind turbine generator |
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| GB0908355D0 (en) * | 2009-05-15 | 2009-06-24 | Bailey Ralph Peter S | Wind turbine diffuser |
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| KR100962774B1 (en) * | 2009-11-09 | 2010-06-10 | 강현문 | Wind power generator |
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| LU33506A1 (en) * | 1953-12-23 | 1900-01-01 | ||
| DE2547503A1 (en) | 1975-10-21 | 1977-04-28 | Brockmann Hans Joachim Prof Dr | Double impeller wind power unit - has higher speed small impeller geared to lower speed larger impeller to produce sum output |
| US4039848A (en) * | 1975-11-10 | 1977-08-02 | Winderl William R | Wind operated generator |
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| US4217501A (en) * | 1977-10-11 | 1980-08-12 | Allison William D | Mounting for windmills |
| US4345161A (en) * | 1979-02-23 | 1982-08-17 | George Crompton | Multi-wheel windmill electro-generator |
| DE2932293A1 (en) | 1979-08-09 | 1981-02-26 | Rudolf Arnold Erren | Wind powered plant with counter-rotating propellers - ensures constant rotational speed relationship, resulting in generator being driven at optimum value |
| US4299198A (en) * | 1979-09-17 | 1981-11-10 | Woodhull William M | Wind power conversion and control system |
| JPS56138465A (en) * | 1980-03-31 | 1981-10-29 | Matsushita Electric Works Ltd | Propeller windmill |
| DE3018802A1 (en) | 1980-05-16 | 1981-11-26 | Fritz-Helmut 3050 Wunstorf Namendorf | Garden reclining chair self-assembled from rectangular plastics units - each with stiffening flanges and corner legs and simple push on connectors |
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| JPH1162811A (en) * | 1997-08-11 | 1999-03-05 | Akiji Matoba | Wind-mill generating device using wind power repeatedly and strong-wind intercepting device |
-
2000
- 2000-01-26 DE DE10003385A patent/DE10003385A1/en not_active Withdrawn
- 2000-11-14 DK DK00974529T patent/DK1255931T3/en active
- 2000-11-14 EP EP00974529A patent/EP1255931B1/en not_active Expired - Lifetime
- 2000-11-14 KR KR1020027009390A patent/KR20020067935A/en active Application Filing
- 2000-11-14 KR KR1020057022864A patent/KR20050116909A/en not_active Application Discontinuation
- 2000-11-14 WO PCT/EP2000/011218 patent/WO2001055590A1/en active IP Right Grant
- 2000-11-14 CA CA002395612A patent/CA2395612C/en not_active Expired - Lifetime
- 2000-11-14 ES ES00974529T patent/ES2242647T3/en not_active Expired - Lifetime
- 2000-11-14 DE DE50010649T patent/DE50010649D1/en not_active Expired - Lifetime
- 2000-11-14 BR BRPI0017014-3A patent/BR0017014B1/en not_active IP Right Cessation
- 2000-11-14 AU AU12797/01A patent/AU758742B2/en not_active Ceased
- 2000-11-14 AT AT00974529T patent/ATE298840T1/en active
- 2000-11-14 PT PT00974529T patent/PT1255931E/en unknown
- 2000-11-14 JP JP2001555696A patent/JP2003526757A/en active Pending
- 2000-11-14 US US10/182,281 patent/US7074011B1/en not_active Expired - Lifetime
-
2006
- 2006-03-20 JP JP2006076551A patent/JP2006177370A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DK1255931T3 (en) | 2005-10-17 |
| KR20020067935A (en) | 2002-08-24 |
| JP2006177370A (en) | 2006-07-06 |
| DE50010649D1 (en) | 2005-08-04 |
| PT1255931E (en) | 2005-08-31 |
| AU1279701A (en) | 2001-08-07 |
| EP1255931B1 (en) | 2005-06-29 |
| EP1255931A1 (en) | 2002-11-13 |
| BR0017014A (en) | 2002-10-22 |
| ATE298840T1 (en) | 2005-07-15 |
| WO2001055590A1 (en) | 2001-08-02 |
| BR0017014B1 (en) | 2009-01-13 |
| ES2242647T3 (en) | 2005-11-16 |
| AU758742B2 (en) | 2003-03-27 |
| KR20050116909A (en) | 2005-12-13 |
| US7074011B1 (en) | 2006-07-11 |
| CA2395612A1 (en) | 2001-08-02 |
| DE10003385A1 (en) | 2001-08-02 |
| JP2003526757A (en) | 2003-09-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20201116 |