DE3844505A1 - Wind power installation - Google Patents
Wind power installationInfo
- Publication number
- DE3844505A1 DE3844505A1 DE3844505A DE3844505A DE3844505A1 DE 3844505 A1 DE3844505 A1 DE 3844505A1 DE 3844505 A DE3844505 A DE 3844505A DE 3844505 A DE3844505 A DE 3844505A DE 3844505 A1 DE3844505 A1 DE 3844505A1
- Authority
- DE
- Germany
- Prior art keywords
- wind
- power plant
- wind power
- coil
- shaft
- 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.)
- Ceased
Links
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/26—Synchronous generators characterised by the arrangement of exciting windings
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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
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K19/00—Synchronous motors or generators
- H02K19/16—Synchronous generators
- H02K19/38—Structural association of synchronous generators with exciting machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
- H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
- H02K7/1838—Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
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- 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
- F05B2240/2213—Rotors for wind turbines with horizontal axis and with the rotor downwind from the yaw pivot axis
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- 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)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Sustainable Development (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
Description
Die Erfindung betrifft eine Windkraftanlage der im Gattungs begriff des Hauptanspruchs angegebenen Art. Bei der Suche nach regenerativen Energieträgern spielen Wasser, Wind und Sonne eine zunehmende Rolle. Die Erfindung will die Stromge winnung aus Wind auch in geographisch oder klimatisch hin sichtlich gleichmäßiger Windströmungen benachteiligter Regi onen rationell gestalten.The invention relates to a wind turbine in the genus Concept of the main claim specified type. In the search water, wind and. play for renewable energy sources Sun an increasing role. The invention wants the Stromge Wind or geographic or climatic direction visibly uniform wind currents from disadvantaged regions Design ones efficiently.
Diese Aufgabe wird bei einer gattungsgemäßen Windkraftan lage erfindungsgemäß mit den im kennzeichnenden Teil des Hauptanspruchs angegebenen Mitteln gelöst. Man erhält auf diese Weise einen Windkonverter mit einem erheblich verbes serten Gesamtwirkungsgrad.This task is at a generic wind power According to the invention with the in the characterizing part of Main claim specified means solved. You get on this way a wind converter with a significantly verbes total efficiency.
Dieses neuartige System zur Windenergienutzung ermöglicht es, z.B. längs von Bahnlinien, Autobahnen und Überlandstra ßen, kleine und mittlere Windanlagen mit gutem Jahresar beitswirkungsgrad zu errichten, mit denen sowohl schwacher als auch starker Wind in einer Anlage möglichst gut genutzt werden kann.This new system for wind energy utilization enables it, e.g. along railway lines, motorways and overland roads small, medium-sized wind turbines with a good annual season to build efficiency, with both weaker as well as strong wind in a system are used as well as possible can be.
Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Further developments of the invention are in the subclaims specified.
Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels des Erfindungsgegenstan des näher erläutert. Es zeigenThe invention is based on one in the drawing illustrated embodiment of the subject of the invention of explained in more detail. Show it
Fig. 1 eine schematische Übersicht der Windkraft anlage, Fig. 1 is a schematic overview of the wind power plant,
Fig. 2 eine Ansicht eines nach dem Baukastenprinzip zusammengesetzten Flügels, Fig. 2 is a view of an assembled on the modular principle wing,
Fig. 3 eine Ansicht eines einzelnen Flügelsegmentes aus Fig. 2, Fig. 3 is a view of a single vane segment of Fig. 2,
Fig. 4 eine Draufsicht auf ein Verbindungselement aus Fig. 2, gesehen in Richtung der Linie IV-IV und Fig. 4 is a plan view of a connecting element from Fig. 2, seen in the direction of line IV-IV and
Fig. 5 einen Teilschnitt durch Fig. 4 gemäß Linie V-V. Fig. 5 is a partial section through Fig. 4 along line VV.
Zwei Windräder 1 und 2 sind koaxial in und mit einem Genera torgehäuse 3 in Windrichtung verschwenkbar auf einer Stüt ze 4 gelagert. Die Stütze kann wie üblich gestell- oder turmartig ausgebildet sein. Das eine Windrad 1 befindet sich in Windrichtung vor dem Generatorgehäuse 3, das andere Wind rad 2 hinter ihm, so daß sich für einen im Generatorgehäu se 3 untergebrachten elektrischen Generator ein Zwillings antrieb ergibt.Two wind turbines 1 and 2 are coaxially mounted in a gate housing 3 and pivotable in the wind direction on a support ze 4 . As usual, the support can be designed like a frame or tower. One wind turbine 1 is located in the wind direction in front of the generator housing 3 , the other wind wheel 2 behind it, so that there is a twin drive for an electrical generator housed in the generator housing 3 .
Die beiden Windräder 1 und 2 drehen sich gegenläufig mit verschiedenen Geschwindigkeiten. Das vordere Windrad 1 ist ein Schnell-Läufer (z.B. ein-, zwei- oder dreiflügelig), das hintere Windrad 2 ein mehrflügeliger Langsam-Läufer.The two wind turbines 1 and 2 rotate in opposite directions at different speeds. The front windmill 1 is a high-speed runner (eg one, two or three-bladed), the rear windmill 2 is a multi-bladed slow runner.
Das Windrad 2 hat eine Hohlwelle 5, die sich um eine in ihr verschiebbar gelagerte Welle 5 des Windrades 1 dreht. Eine Windfahne 7 sorgt dafür, daß die Drehachse der Anlage im wesentlichen in Windrichtung liegt. Die Länge der Flügel des Schnell-Läufers 1 kann in an sich bekannter Weise in Abhän gigkeit von der Drehzahl veränderlich sein, wie durch Pfeile a und b angedeutet ist. Ebenso kann der axiale Abstand der Windräder 1 und 2 in Abhängigkeit von den Betriebserforder nissen verändert werden, wie durch Pfeile c und d angedeutet ist.The wind wheel 2 has a hollow shaft 5 which rotates about a shaft 5 of the wind wheel 1 which is displaceably mounted in it. A wind vane 7 ensures that the axis of rotation of the system lies essentially in the wind direction. The length of the wing of the fast runner 1 can be variable in a manner known per se depending on the speed, as indicated by arrows a and b . Likewise, the axial distance of the wind turbines 1 and 2 can be changed depending on the operational requirements, as indicated by arrows c and d .
Die auf den beiden Seiten des Generatorgehäuses 3 ange brachten Windräder 1 und 2 drehen sich gegenläufig und unterscheiden sich in der Zahl der Flügel. Damit können unterschiedliche Windgeschwindigkeiten - bei entsprechender Dimensionierung der Flügel bzw. Festlegung der Flügelzahl - optimal genutzt werden. Beim Auftreten eines Windes positio niert sich die Anlage mittels der Windfahne 7 so, daß der Wind zuerst auf das Windrad 1 mit der kleinen Flügelzahl trifft.The on both sides of the generator housing 3 brought wind turbines 1 and 2 rotate in opposite directions and differ in the number of blades. Thus, different wind speeds - with appropriate dimensioning of the wings or defining the number of blades - to best effect. When a wind occurs, the system is positioned by means of the wind vane 7 so that the wind first hits the wind turbine 1 with the small number of blades.
Bei schwachen Winden dreht sich jedoch das Windrad 2 mit der hohen Flügelzahl zuerst und kann bereits elektrische Energie abgeben. Wird der Wind stärker, dreht sich auch das dem auf treffenden Wind näherstehende gegenläufige Windrad 1 mit der kleinen Flügelzahl.With weak winds, however, the wind turbine 2 with the high number of blades rotates first and can already give off electrical energy. If the wind becomes stronger, the opposing wind wheel 1 with the small number of blades, which is closer to the wind, also rotates.
Mit zunehmender Windstärke verbraucht das erste Windrad 1 Anteile der zuströmenden Windenergie und bremst die Gesamt- Windgeschwindigkeit.Damit wird das in der Windströmung A folgende Windrad 2 mit der höheren Flügelzahl immer nur mit der für diesen Typ benötigten geringeren Strömungsgeschwin digkeit B beaufschlagt, wie dies durch entsprechende Pfeile angedeutet ist.As the wind strength increases, the first wind turbine 1 consumes portions of the inflowing wind energy and brakes the overall wind speed, so that the wind turbine 2 following in the wind flow A with the higher number of blades is only ever acted on with the lower flow velocity B required for this type, as is the case with corresponding arrows are indicated.
Beide Windräder 1 und 2 können mit einer z.B. die Zentrifu galkraft nutzenden Einrichtung ausgerüstet werden, die be wirkt, daß sich bei zunehmender Drehzahl der Abstand zwischen den Windrädern verringert (Pfeile c und d). Damit wird die Aufteilung der Windströmungen geändert, und das Windrad 2 mit der hohen Flügelzahl hat in einem weiten Wind geschwindigkeitsbereich eine relativ konstante Drehzahl.Both wind turbines 1 and 2 can be equipped with a device that uses centrifugal force, for example, which causes the distance between the wind turbines to decrease as the speed increases (arrows c and d ). This changes the distribution of the wind currents, and the wind turbine 2 with the high number of blades has a relatively constant speed in a wide wind speed range.
Durch Flügelanzahl, Durchmesserverhältnisse und Abstand der Windräder kann unter Beachtung des jährlichen Windganges für den Aufstellungsort die optimale Dimensionierung der Anlage erfolgen. By number of blades, diameter ratios and distance of Wind turbines can take into account the annual wind gear for the installation site the optimal dimensioning of the system respectively.
Besondere Aufmerksamkeit ist der schnellaufenden Seite zu widmen, denn sie soll die vielflügelige Seite zuverlässig vor zu hohen Drehzahlen bei höheren Windstärken schützen. Dazu soll entweder z.B. ein zentrifugal wirkendes Bauteil oder ein Federelement dienen, das den Abstand zwischen den beiden Windrädern bei zunehmender Windgeschwindigkeit ver kleinert, wie dies durch die Pfeile c und d angedeutet ist. Es kann auch vorgesehen werden, daß sich die Flügel - zur besseren Windaufteilung z.B. durch zentrifugalwirkende Ge wichte oder Federelemente je nach Windbelastung teleskop artig verlängern bzw. verkürzen (Pfeile a und b).Particular attention should be paid to the high-speed side, as it is intended to reliably protect the multi-wing side from excessive speeds at higher wind speeds. For this purpose, either a centrifugally acting component or a spring element is to be used, which reduces the distance between the two wind turbines as the wind speed increases, as indicated by the arrows c and d . It can also be provided that the vanes - weights or to improve wind allocation for example by zentrifugalwirkende Ge spring elements telescopically depending on the wind load like prolong or shorten (arrows a and b).
Die Verringerung des Abstandes einerseits und die Vergröße rung des wirksamen Querschnittes schützen das vielflügelige Windrad 2 zuverlässig und gewährleisten eine relativ gleich mäßige Frequenz der Spannung.The reduction of the distance on the one hand and the enlargement of the effective cross-section reliably protect the multi-blade wind turbine 2 and ensure a relatively uniform frequency of the voltage.
Der Generator der Windkonverteranlage besitzt gegenläufige Erregerspulen bzw. Magnete. Die einzelnen Einheiten können konstruktiv sowohl neben als auch übereinander angeordnet sein und sind je nach fertigungstechnischem Aufwand in Ab hängigkeit vom Drehzahlverhältnis festzulegen.The generator of the wind converter system has opposite directions Excitation coils or magnets. The individual units can constructively arranged both next to and on top of each other be and are in Ab depending on the production engineering effort depending on the speed ratio.
Das sich langsam drehende Windrad 2 ist konstruktiv fest mit einer Spule 8 verbunden, die in einer käfigartigen Erweite rung 9 der Hohlwelle 5 angeordnet ist. Diese dreht sich um einen Permanentmagneten 10, der mit der Welle 5 des Wind rades 1 eine Einheit bildet. Die durch die Drehung über den Permanentmagneten 10 induzierte Wechselspannung (Hilfserre gung) wird über Gleichrichterdioden 11 einer zweiten Spule 12, die mechanisch mit der ersten Spule 8 fest verbunden ist, zugeführt.The slowly rotating wind turbine 2 is structurally connected to a coil 8 , which tion 9 of the hollow shaft 5 is arranged in a cage-like expansion. This rotates around a permanent magnet 10 , which forms a unit with the shaft 5 of the wind wheel 1 . The AC voltage induced by the rotation via the permanent magnet 10 (auxiliary excitation) is supplied via rectifier diodes 11 to a second coil 12 which is mechanically connected to the first coil 8 .
Diese zweite Spule 12 erzeugt ein magnetisches Feld (Haupt erregung), das wiederum durch seine Drehung in einer mit dem Generatorgehäuse 3 fest verbundenen dritten Spule 13 eine elektrische Wechselspannung U ≈ erzeugt, die dem Verbraucher zugeführt wird.This second coil 12 generates a magnetic field (main excitation), which in turn generates an electrical alternating voltage U ≈ by its rotation in a third coil 13 which is fixedly connected to the generator housing 3 and which is supplied to the consumer.
Für Generatoren größerer Leistung ist zusätzlich oder an stelle zu dem permanent magnetischen Feld ein elektromagne tisches Feld vorgesehen. Entsprechende Elektromagnete (Spu le 14) sind über Gleichrichterdioden 15 an eine fünfte Spu le 16 angeschlossen, die gleichfalls mit der Welle 6 des schneller drehenden Windrades 1 mechanisch verbunden ist. Radial zu dieser Spule 16 sind am feststehenden Generator gehäuse 3 Magnete 17 angebracht.For generators of higher power, an electromagnetic field is provided in addition to or instead of the permanent magnetic field. Corresponding electromagnets (coil 14 ) are connected via rectifier diodes 15 to a fifth coil 16 , which is also mechanically connected to the shaft 6 of the faster rotating wind turbine 1 . Radially to this coil 16 3 magnets 17 are attached to the fixed generator housing.
Bei Drehung des zugeordneten Windrades 1 wird ein Strom in duziert (Hilfserregung), der wie schon erwähnt, die Haupt erregung speist.When the assigned wind turbine 1 rotates, a current is induced in (auxiliary excitation), which, as already mentioned, feeds the main excitation.
Die am feststehenden Generatorgehäuse 3 angebrachten Magne te 17 können auch Elektromagnete 18 sein, die dann von der feststehenden Spule 13, an die die Verbraucher geschaltet sind, gespeist werden.The attached to the fixed generator housing 3 Magne te 17 can also be electromagnets 18 , which are then fed by the fixed coil 13 to which the consumers are connected.
Bei den Flügeln des Langsamläufers kann eine einheitliche Fertigung nach Baukastenprinzip erfolgen.In the slow-moving wings, a uniform Manufactured on a modular basis.
Die einzelnen Blätter 19 der Windflügel werden aus gleichen korrosionsbeständigen Flügelsegmenten 20, die konstruktiv nebeneinander bzw. hintereinander angeordnet sind, aufge baut. Als verbindene Elemente sind Stangen 2 vorgesehen, die die Zugkräfte aufnehmen. Beispielsweise besteht ein Flügelabschnitt eines Langsamläufers 2 aus drei nebenein ander mit vier Zugstangen 2 verbundenen Flügelsegmenten 20. Daran schließt sich nach außen ein Flügelabschnitt aus vier Flügelsegmenten 20 mit fünf Zugstangen 21 an. In Richtung Generatorwelle folgt dagegen ein zweisegmentiger Flügelab schnitt mit drei Zugstangen und abschließend (nicht darge stellt) ein Flügelsegment mit zwei Zugstangen. The individual blades 19 of the wind blades are built from the same corrosion-resistant wing segments 20 , which are structurally arranged side by side or one behind the other. Rods 2 which absorb the tensile forces are provided as connecting elements. For example, a wing section of a slow-moving vehicle 2 consists of three side by side other wing segments 20 connected to four tie rods 2 . This is followed on the outside by a wing section composed of four wing segments 20 with five tie rods 21 . In the direction of the generator shaft, on the other hand, there follows a two-segment wing section with three tie rods and finally (not shown) a wing segment with two tie rods.
Das einzelne Flügelsegment 20 hat ein flaches Rechteckprofil mit Hohlkehlen 22 an den schmalen Längsseiten, die zur Auf nahme der Zugstangen 21 dienen. Die schmalen Querseiten sind durch aerodynamische Formkörper 23 mit erforderlichen Befesti gungsmöglichkeiten 24 für die Zugstangen 21 konstruktiv ver bunden. Mittels der Formkörper 23 kann den mehrsegmentigen Flügelabschnitten ein aerodynamisch günstiges Profil gegeben werden.The individual wing segment 20 has a flat rectangular profile with fillets 22 on the narrow long sides, which are used to measure the tie rods 21 . The narrow transverse sides are by means of aerodynamic shaped bodies 23 with necessary fastening options 24 for the tie rods 21 constructively connected. The multi-segment wing sections can be given an aerodynamically favorable profile by means of the shaped bodies 23 .
Die erwähnte Querbewegung der Welle 6 in Richtung der Pfeile c und d zur Verminderung des Abstandes zwischen den Wind rädern 1 und 2 wird vorteilhaft durch Federn begrenzt, die insbesondere bei plötzlichen Böen zur Dämpfung beitragen. Im übrigen läßt sich durch Eindrücken des Windrades 1 mit Ver schiebung der Welle 6 eine Veränderung des Magnetfeldes im Inneren des Generatorgehäuses 3 erzielen.The above-mentioned transverse movement of the shaft 6 in the direction of arrows c and d to reduce the distance between the wind wheels 1 and 2 is advantageously limited by springs, which contribute to damping particularly in the case of sudden gusts. In addition, can be achieved by pushing the wind turbine 1 with Ver shifting the shaft 6, a change in the magnetic field inside the generator housing 3 .
Das Prinzip der gegenläufigen Drehungen von Erregungssystemen in Generatoren kann grundsätzlich auch bei anderen Antrieben angewandt werden. Gerade bei langsam laufenden Aggregaten läßt sich damit ein verbesserter Nutzungsgrad erzielen. Neben der Anwendung als Generator kann diese Konstruktion auch als einfach zu regelnder motorischer Antrieb dienen.The principle of opposite turns of excitation systems in generators can basically also with other drives be applied. Especially with slow running units achieve an improved degree of utilization. In addition to the This construction can also be used as a generator easy-to-control motor drive.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE3844505A DE3844505A1 (en) | 1988-12-31 | 1988-12-31 | Wind power installation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE3844505A DE3844505A1 (en) | 1988-12-31 | 1988-12-31 | Wind power installation |
Publications (1)
Publication Number | Publication Date |
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DE3844505A1 true DE3844505A1 (en) | 1990-07-05 |
Family
ID=6370646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE3844505A Ceased DE3844505A1 (en) | 1988-12-31 | 1988-12-31 | Wind power installation |
Country Status (1)
Country | Link |
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DE (1) | DE3844505A1 (en) |
Cited By (47)
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DE4436057A1 (en) * | 1994-10-10 | 1995-03-30 | Klaus Peter Jaehnke | Combined wind power machine (wind energy converter, WEC) |
DE4437972A1 (en) * | 1994-10-24 | 1996-04-25 | Siemens Ag | Permanent magnet excited wind power generator |
DE19543458A1 (en) * | 1995-11-22 | 1997-05-28 | Ekkehard Senf | Wind power plant with rotor blades arranged in two sets |
GB2288642B (en) * | 1994-04-19 | 1997-12-10 | David Johnston Burns | Electrical power generation apparatus and an electrical vehicle including such apparatus |
DE19819480A1 (en) * | 1998-04-30 | 1999-11-04 | Volkswagen Ag | Generator, especially for extracting brake energy in vehicles |
DE19827261C1 (en) * | 1998-06-18 | 2000-03-02 | Siemens Ag | Power fluctuation compensation method for generator e.g. of wind-power station |
FR2796671A1 (en) * | 1999-07-22 | 2001-01-26 | Jeumont Ind | Wind energy electricity generator having mast mounted section with helices/capture units driving electrical generator and power electronics section independently adjusting rotors. |
EP1096144A2 (en) * | 1999-11-01 | 2001-05-02 | Masaharu Miyake | Wind-driven power generating apparatus |
US6476513B1 (en) * | 2000-09-28 | 2002-11-05 | Lubomir B. Gueorguiev | Electrical generator system |
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US8957555B2 (en) | 2011-03-10 | 2015-02-17 | Wilic S.Ar.L. | Wind turbine rotary electric machine |
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US20170117783A1 (en) * | 2015-10-27 | 2017-04-27 | Kuo-Chang Huang | Fluid driven electric generator |
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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 |
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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 |
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