WO2014002118A1 - Vertical axis wind turbine - Google Patents

Vertical axis wind turbine Download PDF

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Publication number
WO2014002118A1
WO2014002118A1 PCT/IN2013/000401 IN2013000401W WO2014002118A1 WO 2014002118 A1 WO2014002118 A1 WO 2014002118A1 IN 2013000401 W IN2013000401 W IN 2013000401W WO 2014002118 A1 WO2014002118 A1 WO 2014002118A1
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WO
WIPO (PCT)
Prior art keywords
wind turbine
vertical axis
assembly
gear means
axis wind
Prior art date
Application number
PCT/IN2013/000401
Other languages
French (fr)
Inventor
Rajagopal Raghunathan VALAGAM
Original Assignee
Valagam Rajagopal Raghunathan
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 Valagam Rajagopal Raghunathan filed Critical Valagam Rajagopal Raghunathan
Publication of WO2014002118A1 publication Critical patent/WO2014002118A1/en

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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 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • 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
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/70—Bearing or lubricating arrangements
    • 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
    • F05B2260/40—Transmission of power
    • F05B2260/403—Transmission of power through the shape of the drive components
    • F05B2260/4031—Transmission of power through the shape of the drive components as in toothed gearing
    • 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
    • F05B2260/50—Kinematic linkage, i.e. transmission of position
    • F05B2260/503—Kinematic linkage, i.e. transmission of position using gears
    • F05B2260/5032—Kinematic linkage, i.e. transmission of position using gears of the bevel or angled type
    • 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 invention relates to a vertical axis wind turbine for generating multi kilo watt power at rated wind speed by means of scaled up rotor, assembly and plurality of generators.
  • the vertical axis wind turbine comprises of a main gear means (it may refer large bull gear/main driving means), a plurality of generators, a plurality of small gear means, a tower assembly with plurality of poles, a control means, a lubricating means and a rotor assembly.
  • the plurality of generators with small gear means and main gear means are fastened in the tower assembly through a connecting means.
  • the rotor assembly rotatably connected with the rotor assembly and the plurality of generators drivingly engaged with the main gear means.
  • the air foil blade used in the rotor (3) is made by composite material particularly glass fiber composition.
  • the main purpose of this invention is optimum utilization of rated wind and to provide plurality of generators (1 ) for maximum utilization of rotor assembly (3) for generating electricity (multi hundreds kilo watt power) continuously at rated wind speed.
  • the entire tower assembly (5) is made by composite material such as glass fiber composition.
  • the control means allows the electricity to the selected number of generators and operates the selected number of generators as a motor in order to start up the rotor when the wind speed attains cut-in wind speed.
  • the cut-in wind speed is the minimum wind speed at which the wind turbine will generate usable power.
  • the control means allows all the generators to produce electricity when the wind turbine operates at rated wind condition.

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  • Engineering & Computer Science (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)

Abstract

The present invention- relates to a vertical axis wind turbine for generating multi kilo watt power at rat&d wind speed by means of scaled up rotor assembly and plurality of generators. The vertical axis wind turbine comprises of a main gear means/ main driving means(2), a plurality of generators (1), a plurality of small gear means (6), a tower assembly (5) with plurality of poles, a control means, a lubricating means and a rotor assembly (3), rotatable supporting means/rolling means (9). In one embodiment shown in figure 1&1a, the main gear means/main driving means (2) configured to drive the plurality of small gear means (6) of generators for generating power, where rotatable supporting means/rolling means (9) act as a rotatable supporting assembly of the tower assembly (5). In another embodiment shown in figure 1b&1c, where each rotatable supporting means/rolling means (3) connected with each generator via shaft (11), and each contact region or tapered region of rotatable supporting means/rolling means (3) frictionally and rotatably engaged with tapered region/circular track (8) of the main gear means for generating power at rated wind speed.

Description

Title: VERTICAL AXIS WIND TURBINE
Applicant's Name: VALAGA RAJAGOPAL RAGHUNATHAN
Priority application no.: 2589/CHE/2012
FIELD OF THE INVENTION
The invention relates to a vertical axis wind turbine more particularly the invention relates to scaled up turbine rotor assembly with plurality of generators on a lattice composite tower.
BACKGROUND OF THE INVENTION The recent demand in fossil fuels prices, demands for cleaner energy sources, and wind turbines are becoming a more suitable technology for electrical power generation. Currently, horizontal axis wind turbines (HAWT) dominate commercially over vertical axis wind turbines (VAWT). However, VAWT do have some advantages over HAWT.
Despite the advancements that have been made in the design of VAWTs and the inherent advantages of VAWTs over horizontal axis wind turbines, the VAWT is desired which can be even more cost effective in construction, erection, maintenance and operation. It can be applicable only for small sized VAWT. Thereafter, inventors have made several attempts to create a cost effective VAWT that will grow with the slowly increasing value of energy since of 1973. As the size of wind turbines grows, there are several technical issues that adversely affect the economics of wind energy and that can potentially lead to limitations in turbine size.
The prior art U.S. Pat. No. 4,449,053 discloses VAWT machines for a wide range of power capacities (22 KW, 60 KW, 112 KW, 300 KW, 500 KW). These scaled up VAWTs had an erection hinge for the rotor and upper bearing assemblies and a costly automatic oiling arrangement for the upper bearing. The prior art VAWT had a large fixed central support structure that favored the 112 KW and larger machines. The prior art VAWTs did not have an erection gin pole therefore requiring the use of a crane for the erection of all machines regardless of power rating. As per the basic design principles indicate that the weight of the turbine increases approximately with the cube of the rotor diameter. To scale up the rotor assembly, there is a need to increase the area of the blade assembly relative to the swept area of the rotor for providing high solidity, and the rotor needs long composite blade would require a complex and prohibitively costly machineries Therefore system cost is generally proportional to the turbine's weight and so the cost of the turbine increases approximately with the rotor diameter. Here, the turbine weight and cost increases faster than the energy capture.
Another major impact is maintenance of huge generator assembly. In the process of such maintenance or failure, there are two problems. Firstly, a very large wind turbine fails (or during maintenance period), its entire production is lost.
Secondly, in order to land the huge generator by using the large size crane, a lot of machinery and much manpower are required. This means that the maintenance work requires great costs and a long period for the maintenance. With a view to accomplish the above needs, following solutions to be provided in the present invention.
The present invention solves the problems of the prior art wind turbines by
1. Scaling up and constructing the rotor assembly based on optimum utilization of rated wind speed,
2. Providing plurality of smaller high efficiency generators in a single tower for generating electricity at rated wind speed even any generator failure condition. 3. Constructing the turbine with composite fiber for reducing cost of tower assembly.
OBJECT OF THE INVENTION The object of the invention is to scale up the vertical axis wind turbine for generating multi hundreds kilowatt power at rated wind speed.
Another object of the invention is to provide a plurality of generators for single tower assembly for generating scalable power at rated wind speed.
Yet another object of the invention is to produce electricity even any one of the generator fail condition.
Yet another object of the invention is to construct the tower assembly with composite fiber for reducing the construction cost of turbine.
Yet another object of the invention is to provide a lubricating means for lubricating the gear engagement region between the main gear means and smaller gear means. Yet another object of the invention is to provide a rotatable supporting means around the tower assembly for rotatably securing the main gear means/main driving means.
Further object of the invention is to use a rotatable supporting means as a friction drive for generating power.
SUMMARY OF THE INVENTION The invention relates to a vertical axis wind turbine for generating multi kilo watt power at rated wind speed by means of scaled up rotor, assembly and plurality of generators. The vertical axis wind turbine comprises of a main gear means (it may refer large bull gear/main driving means), a plurality of generators, a plurality of small gear means, a tower assembly with plurality of poles, a control means, a lubricating means and a rotor assembly. The plurality of generators with small gear means and main gear means are fastened in the tower assembly through a connecting means. The rotor assembly rotatably connected with the rotor assembly and the plurality of generators drivingly engaged with the main gear means. When the main gear means rotates along with rotor assembly at rated wind speed thereby main gear means drives the plurality of small gear means of generators for generating power. The present invention has an advantage in terms of availability and maintenance. When a very large wind turbine faults offline, its entire production is lost. In contrast, one of the generators of the VAWT can fault offline with the resulting loss of only a small fraction of the total output. The control means controls the generators and lubricating means. The control means enables the selected number of generators and operates the selected number of generators as a motor in order to start up the rotor when the wind speed attains cut-in wind speed. The cut-in wind speed is the minimum wind speed at which the wind turbine will generate usable power. When the rotor gets sustainable revolution then the control means disable motor. The control means also controls the lubricating means for providing lubrication on the gear engagement at predetermined interval. The arrangement of track and rotatable supporting means can be performed as a friction drive for generating power. In this configuration the shaft of the generator attached with shaft of the rotatable supporting means/rolling means.
BRIEF DESCRIPTION OF DRAWINGS
S.NO PART NAME PART NO
1. Generator 1
2. Main gear means/ Bull gear/main driving 2
means
3. Rotor assembly 3
4. Gear box assembly 4
5. Poles of tower assembly/tower assembly 5
6. Small gear means 6
7. Segment of main gear 7
means/ Main driving means
8. Circular Track of main gear 8
means/engagement region/tapered region
9. rotatable supporting means/rolling 9
means/tapered rolling means
10. Supporting arm 10
11. Shaft 11 Fig 1 illustrates one of the embodiment of the present invention which clearly shows the front view of the invention, which shows the plurality of generators(l) arranged in the pole assembly/tower (5) and plurality of small gear means(6) of the generators engaged with the main gear means(2).
Fig 1a illustrates another embodiment of the invention, which clearly shows the gear engagement, gear box assembly (4), attachment of pole assembly(5) with supporting arm(10), rotatable supporting means/rolling means (9), generator (1), small gear means(6) and main gear means/main driving means (2). Fig 1b & 1c illustrates yet another embodiment of the present invention, which shows rotatable supporting means/rolling means (9) attached with shaft (1 1) of the generator for generating power by means of (tapered) frictional engagement.
Fig 2 illustrates further embodiment of the present invention, which illustrates the top view of the vertical axis wind turbine with main gear means/main driving means (2), more than one generator (1), gear box (4), small gear means (3) and tower (5). Further it shows engagement between main gear means/main driving means (2) and small gear means (6).
Fig 3a and 3b illustrates top and bottom view of the main gear means (2), which clearly shows main gear means/main driving means (7) is a combination of more than one segments. Particularly 3a shows bottom portion with circular track/engagement region/tapered surface (8), and 3b shows top portion.
The above drawing illustrates the details has been given and will be provided with respect to certain specific embodiments, it is to be understood that the scope of the disclosure should not be limited to such embodiments but that the same are provided simply for enablement and best mode purposes. The breadth and spirit of the present disclosure is broader than the embodiments specifically disclosed and encompassed within the claims eventually appended hereto. DETAILED DESCRIPTION OF THE INVENTION The present invention discloses about vertical axis wind turbine for generating multi hundred kilo watt powers at rated wind speed by means of scaled up rotor assembly (3) and plurality of generators (1).
The vertical axis wind turbine comprises of« a rotor assembly (3), a main gear means/main driving means (2), a plurality of generators (1), a small gear means (6), a tower assembly (5), a rotatable supporting means (9), a control means and a lubricating means.
ROTOR ASSEMBLY (Refer fig 1 )
The scaling up of the rotor assembly is based on aerodynamic optimization and structural optimization, which provides substantially improved performance characteristics. The scaled up rotor assembly (3) is capable for optimum utilization of rated wind speed. The rotor assembly (3) is based on the theoretical optimum aerodynamic structure modified as required to maximize structural integrity.
For generating high power, there is a need to construct a rotor assembly (3) with high solidity such that the vertical axial rotor has to run at a lower rpm. For constructing the high solidity with low rpm rotor for generating high power, there is a need to increase the area of the blade assembly relative to the swept area of the rotor.
In one aspect, the rotor assembly having large swept area and unique construction of the rotor assembly is shown in figure 1. As per figure 1 , the air foil blade height is extended above the tower height and below the main gear means. One arm is rotatably attached with the main gear means and another arm is rotatably attached with edge of the tower assembly where all the top end of poles of the tower assembly are joined together and form a cone shape. The edges of the air foil blade connected with the tower assembly through a metal rope means.
In another aspect, the air foil blade used in the rotor (3) is made by composite material particularly glass fiber composition. The main purpose of this invention is optimum utilization of rated wind and to provide plurality of generators (1 ) for maximum utilization of rotor assembly (3) for generating electricity (multi hundreds kilo watt power) continuously at rated wind speed.
TOWER ASSEMBLY (Refer fig 1) In one aspect, a lattice tower for use with a vertical axis wind turbine is provided. The lattice tower (5) includes at least one support extending from a ground surface or foundation. At least one cross-support member is coupled to the support to form the lattice tower. The lower portion being mountable on the foundation to secure the wind turbine assembly on the foundation. In another aspect of the invention, the entire tower assembly (5) is made by steel.
In another aspect of the invention, the entire tower assembly (5) is made by composite material such as glass fiber composition.
In another aspect, the tower assembly (5) may be a lattice tower assembly or mono tower assembly or any other form of tower assembly. Any form of tower assembly can be used to secure the present scaled up vertical axis wind turbine.
The embodiments described herein facilitate assembling a vertical axis wind turbine support tower. More specifically, the embodiments described herein include plurality of poles (5). Each pole having a supporting arm (10) assembly which includes rotatable supporting means/rolling means (9) which can be engaged with circular track (8) of the main gear means/main driving means (2) for rotatably holding the main gear means/main driving means (2). Each pole is capable of attaching more than one generator (1) through a connecting means. Each generator having at least one small gear means (6), the small gear means (6) may be single or group of small gear arrangements. One of the preferred embodiment of the invention discloses about gear transmission or gear engagement between main gear means/main driving means (2) and small gear means (6) for generating power (refer fig 1 and fig 1a).
The gear arrangement disclosed herein includes main gear means (2) and plurality of small gear means (6). The main gear means (2) also called as a bull gear assembly or main driving means (2) which is a centralized gear arrangement. The inner circumference of main gear means (2) and outer circumference of small gear means (6) having teethed circumference. The small gear means (6) are drivably engaged with generators (1). Each of the said plurality of generators (1) having at least one small gear means (6) and each small gear means (6) rotatably engaged with circumference of the main gear means (1). The main gear means (1) also rotatably attached with the rotor assembly (3). Specifically, the use of engagement of main gear means (2) with small gear means (6) for gear reduction. The main gear means (2) also transfers rotation and torque to plurality of small gear means (6), for instance, which drive a small gear means (6) that, in turn, causes driven of plurality of generators (1). At rated wind speed the main gear means rotates (2) along with rotor assembly (3) thereby main gear means (2) drives the plurality of small gear means (2) for generating power.
In one aspect the main gear means (2) comprises of plurality of segments (7) for easy manufacturing and installation. The each segment (7) is individually fabricated for making main gear means (2). Each segment is connected by a connecting means to form a large circular shape.
In another aspect of the invention, the engagement portion is covered by a gear box (4). Plurality of small gear means of generators are also covered by a gear boxes (4). The lubricating means also placed inside the gear boxes). In another aspect of the invention, vertical axis wind turbine includes variable capacity generators (1), each generator having different gears based on the capacity of generator (1). So, plurality of small gear means (6) with plurality of gears can be engaged with said main gear means /main driving means (2) for generating optimum kilo watt power at various wind speed. As per the present invention, the individual generators are more cost-effective than one huge generator because, the generators (1) are mounted on a single lattice tower assembly (5), only one foundation and plurality of poles are required to attach the generators, thereby providing cost savings over a plurality of smaller generators on individual towers. Therefore, the turbine of the present invention provides the economy of scale that can be obtained with a very large turbine, but it also avoids the disadvantages associated with a huge generators.
The above construction allows the entire system to operate at peak efficiency.
Another embodiment of the invention discloses about gearless transmission or frictional engagement between main driving means (2) and rotatable supporting means/rolling means (9) for generating power (refer fig 1b and fig 1c).
The gearless arrangement disclosed herein includes main driving means (2) and plurality of rotatable supporting means/rolling means (9). The main driving means also called as a bull gear/main gear means assembly which is a centralized gear arrangement. The outer circumference of main gear means and outer circumference of rolling means/rotatable supporting means (9) having an engagement region or tapered region for frictional engagement. Each engagement region of rotatable supporting means rotatably and frictionally engaged with track/engagement region (8) of the main gear means/main driving means (2). Further, the shaft of the rotatable supporting means (9) is coupled with shaft of the generator (1). Thereby, the main gear means/main driving means (2) drives the plurality of rotatable supporting means (9) at rated wind speed for generating power while turbine rotation. If the power generation is performed in this manner, the need of lubricating means will be eliminated.
Yet another embodiment of the invention discloses about control means and Lubricating means. The wind turbine further includes control means and lubricating means. The control means controls the generators based on the wind speed.
The control means allows the electricity to the selected number of generators and operates the selected number of generators as a motor in order to start up the rotor when the wind speed attains cut-in wind speed. The cut-in wind speed is the minimum wind speed at which the wind turbine will generate usable power. When the rotor gets sustainable revolution then the control means stops the electricity to the motor.
The control means allows all the generators to produce electricity when the wind turbine operates at rated wind condition.
The control means disable the selected number of generators and continuously producing electricity from remaining generators during service or maintenance condition. The control means also controls the lubricating means for providing lubrication on the gear engagement at predetermined interval.
Yet another embodiment of the invention discloses about the vertical axis wind turbine, the tower assembly having plurality of poles, each pole having a provision for attaching the generator assembly. Each generator attached with the pole by a coupling means. Each generator having a gear arrangement. The gear arrangement disclosed herein includes main gear means and plurality of small gear means. The outer circumference of main gear means and small gear means having teethed circumference. The small gear means are drivably engaged with outer circumference of the main gear means. At rated wind speed, the main gear means rotates along with rotor assembly thereby main gear means drives the plurality of small gear means for generating power.
Yet another embodiment of the invention discloses about a supporting assembly of the main gear means (2). The supporting assembly includes plurality of rotatable supporting means (9) which is attached with plurality of poles through the plurality of cantilever structure or supporting arm. As per the figure 1(a) and 1(c), the rotatable supporting means has a tapered surface on its circumferences, which can be engaged with the circular track / tapered edge of the bottom portion of the main gear means/main driving means (2) for rotatably hold the entire main gear means(2). Plurality of circular shaped recess and plurality of rotatable supporting means (9) can be provided in the main gear means (2) and supporting assembly based on the diameter and weight of the main gear means (2). Yet another embodiment of the invention discloses about high stability factor of vertical axis wind turbine. Here, the entire gear engagement assembly is provided near the ground surface of the tower assembly for providing high stability.
Yet another embodiment of the invention discloses about providing mass assembly on the tower assembly, the mass assembly may be a combination of main gear means, small gear means, with or without gear box and generator assembly which is added to rotational axis to increase the moment of inertia thereby VAWTs are not affected by wind speed variation, owing to their high moment of inertia.
Yet another preferred embodiment of the invention discloses about a vertical axis wind turbine for generating power at rated wind speed by means of scaled up rotor assembly and plurality of generators. The vertical axis wind turbine comprises of at least one main gear means/main driving means (2), plurality of generators (1), plurality of small gear means (6), a tower assembly (5), at least one control means, a plurality of lubricating means, plurality of rotatable supporting means/rolling means (9), and at least one rotor assembly (3). The rotor assembly mounted on the tower assembly and the main gear means/main driving means (2) of the rotor assembly secured by means of rotatable supporting means/rolling means (9) of the tower assembly (5). The main gear means (2) comprises of at least one engagement region/circular track (8) configured to engage with the said plurality of rotatable supporting means/rolling means (9). This arrangement rotatably provides the support to main gear means/ main driving means (2). The main gear means/ main driving means further comprises of a gear arrangement configured to rotatably engaged with small gear means (6) of the said plurality of generators (1) thereby main gear means (2) drives the plurality of small gear means (6) for generating power. The main gear means (2), small gear means (6) and generator (1) assembly is positioned near the base of the tower assembly (5) for providing high stability and high moment of inertia. The above said wind turbine further comprises of a plurality of lubricating means provided near the each gear engagement region of both small gear means (6) and main gear means (2) for providing lubrication at engagement portion at predetermined interval, wherein the lubrication means is controlled by the said control means. Yet another embodiment of the invention discloses about a vertical axis wind turbine for generating power at rated wind speed by means of scaled up rotor assembly and plurality of generators, the said vertical axis wind turbine comprises of at least one main gear means (2), a plurality of generators (1), a tower assembly (5), a control means, plurality of rotatable supporting means (9) and a rotor assembly (3). The main gear means or main driving means (2) of the rotor assembly(3) is rotatably and frictionally secured on the tower assembly(5) by means of plurality of rotatable supporting means or rolling means(9). Each soft of the rotatable supporting means/rolling means (9) joined with each shaft of the generator (1), the main gear means (2) comprises of at least one engagement region or circular track (8) configured to frictionally engage with the said plurality of rotatable supporting means thereby main gear means (2) drives the plurality of small gear means (6) for generating power. The main gear means (2), rotatable supporting means (9) and generator (1) assembly is positioned near the base of the tower assembly (5) and configured to provide high stability and high moment of inertia. Yet another embodiment of the invention discloses about dual purpose of the vertical axis wind turbine. The vertical axis wind turbine having main gear means/main driving means (2), small gear means (6) and rotatable supporting means/rolling means (9). The generator can be engaged with either rotatable supporting means/rolling means (9) or small driving means (9) for generating power. The above configuration clearly illustrated in figure 1(b) and figure 1(c).
Yet another embodiment of the invention discloses about the main driving means/main gear means (2) may have gear arrangement on a bottom side or top side or inner side or outer side or combination thereof to engage with small gear means(6).
Yet another embodiment of the invention discloses about the main driving means/main gear means (2) may have contact region/circular track/tapered region on a bottom side or top side or inner side or outer side or combination thereof to frictionally engage with rotatable supporting means/rolling means (9).
Yet another embodiment of the invention discloses about the tower assembly (5) is made by glass fiber composition or steel or combination thereof. Yet another embodiment of the invention discloses about the main gear means (2) can be a combination of plurality of segments (fig 3a&3b).
Yet another embodiment of the invention discloses about capacity or rating of generators. Wherein selected number of generators (1) may have a different capacity and/or different gear ratios of small gear means (6) for generating variable power. Yet another embodiment of the invention discloses about the control means enables selected number of generators (1) as a motor while starting up the rotor assembly (3) and disables the motor at sustainable rotor speed.
Yet another embodiment of the invention discloses about rotor assembly (3) can be mounted in a lattice tower assembly or mono tower assembly or any other form tower assembly.
Yet another embodiment of the invention discloses about the turbine generates power at rated wind speed with selected number of generators whereas predetermined number of generators disabled condition.
Yet another embodiment of the invention discloses about the rotor assembly (3) includes bearing means on top side to rotatably bear the rotor load so partial load or required load only press the rotatable supporting means or rotatable supporting means share partial load or required load.
Yet another embodiment of the invention discloses about the said small gear means (6) can be directly engaged with main gear means (2) (fig 1) or through gear box (4) (fig 1a).
Further embodiment of the invention discloses about the said engagement region of rolling means/rotatable supporting means (9) and main driving means/main gear means (2) are having a tapered shaped for frictional engagement. ADVANTAGE OF THE INVENTION
Advantages in terms of availability and maintenance When a very large wind turbine fails, its entire production is lost. In contrast, one of the generators of the present invention can fault offline with the resulting loss of only a small fraction of the total output. If a 'P' kW winds turbine experiences minor failure, the entire turbine is shutdown with the loss of 'P' kW of power production. A comparable wind turbine system according to the present invention may include 'n' number of generators each with an output of (P/n) kW.
For example, if a 250kw wind turbine experiences minor failure, the entire turbine is shutdown with the loss of 250kw of power production. A comparable wind turbine system according to the present invention may include 16 generators each with an output of 15kw.
From a maintenance point of view, if the huge generator experiences a failure, the operator must wait for the turbine manufacturer to supply another part and the turbine may be shut down for weeks.
By contrast, in the present invention, the operator could more easily change the generator because he can have a spare on hand because the cost of the single generator would be lower in relation to the huge generator.
Another advantage of the present invention is that it does not require a huge crane or more than one crane as prior art turbines did. Turbines that are being erected today in the huge generator assembly require cranes with capacities of over more no of tons that are very expensive to mobilize.
By comparison, each of the smaller generators on the wind turbine of the present invention can be lifted using a much smaller crane/winch that is locally available and can be mobilized for a small fee. While considerable emphasis has been placed herein on the various components of the preferred embodiment, it will be appreciated that many alterations can be made and that many modifications can be made in the preferred embodiment without departing from the principles of the invention. These and other changes in the preferred embodiment as well as other embodiments of the invention will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Claims

WE CLAIM
1. A vertical axis wind turbine for generating power at rated wind speed by means of scaled up rotor assembly and plurality of generators, the vertical axis wind turbine comprises of at least one main gear means/main driving means (2), plurality of generators (1), plurality of small gear means (6), a tower assembly (5), at least one control means, a plurality of lubricating means, plurality of rotatable supporting means/rolling means (9), and at least one rotor assembly (3),
- the rotor assembly mounted on the tower assembly and the main gear means/main driving means (2) of the rotor assembly secured by means of rotatable supporting means/rolling means (9) of the tower assembly (5),
- the main gear means (2) comprises of at least one engagement region/circular track (8) configured to engage with the said plurality of rotatable supporting means/rolling means (9) and gear arrangement configured to rotatably engaged with small gear means (6) of the said plurality of generators (1) thereby main gear means (2) drives the plurality of small gear means(6) for generating power,
- the main gear means (2), small gear means (6) and generator (1) assembly is positioned near the base of the tower assembly (5) for providing high stability and high moment of inertia,
- plurality of lubricating means provided near the each gear engagement region of both small gear means (6) and main gear means (2) for providing lubrication at engagement portion at predetermined interval, wherein the lubrication means is controlled by the said control means.
2. A vertical axis wind turbine for generating power at rated wind speed by means of scaled up rotor assembly and plurality of generators, the said vertical axis wind turbine comprises of at least one main gear means (2), a plurality of generators (1), a tower assembly (5), a control means, plurality of rotatable supporting means (9) and a rotor assembly (3), - the main gear means or main driving means (2) of the rotor assembly(3) is rotatably and frictionally secured on the tower assembly(5) by means of plurality of rotatable supporting means or rolling means(9),
- each soft of the rotatable supporting means/rolling means (9) joined with each shaft of the generator (1),
- the main gear means (2) comprises of at least one engagement region or circular track (8) configured to frictionally engage with the said plurality of rotatable supporting means thereby main gear means (2) drives the plurality of small gear means(6) for generating power,
- the main gear means (2), rotatable supporting means (9) and generator (1) assembly is positioned near the base of the tower assembly (5) and configured to provide high stability and high moment of inertia,
3. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the shaft (11) of the generator (1) can be engaged with small gear means (6) (fig 1b) and/or rotatable supporting means/rolling means (9) (fig 1 (c)) for generating power.
4. The vertical axis wind turbine as claimed in claim 1 to 3, wherein the main driving means/main gear means (2) may have gear arrangement on a bottom side or top side or inner side or outer side or combination thereof to engage with small gear means(6).
5. The vertical axis wind turbine as claimed in claim 1 to 3, wherein the main driving means/main gear means (2) may have contact region/circular track/tapered region on a bottom side or top side or inner side or outer side or combination thereof to frictionally engage with rotatable supporting means/rolling means (9).
6. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the said tower assembly (5) is made by glass fiber composition or steel or combination thereof.
7. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the said main gear means (2) can be a combination of plurality of segments (fig 3a&3b).
8. The vertical axis wind turbine as claimed in claim 1 and 2, wherein selected number of generators (1) may have a different capacity and/or different gear ratios of small gear means(6).
9. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the said control means enables the said selected number of generators (1) as a motor while starting up the rotor assembly (3) and disables the motor at sustainable rotor speed.
10. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the said rotor assembly (3) can be mounted in a lattice tower assembly or mono tower assembly or any other form tower assembly. 1. The vertical axis wind turbine as claimed in claim 1 and 2, wherein the said vertical axis wind turbine generates power at rated wind speed with selected number of generators whereas predetermined number of generators disabled condition.
12. The vertical axis wind turbine as claimed in claim 1 , wherein the said rotor assembly (3) includes bearing means on top side to rotatably bear the rotor load.
13. The vertical axis wind turbine as claimed in claim 1 , wherein the said small gear means (6) can be directly engaged with main gear means (2) (fig 1) or through gear box (4) (fig 1a).
14. The vertical axis wind turbine as claimed in claim 1 , wherein the said engagement region of rolling means/rotatable supporting means (9) and main driving means/main gear means (2) are having a tapered shaped for frictional engagement.
PCT/IN2013/000401 2012-06-29 2013-06-28 Vertical axis wind turbine WO2014002118A1 (en)

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IN2589CH2012 2012-06-29

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WO2015128874A3 (en) * 2014-02-25 2015-12-10 Valagam Rajagopal Raghunathan An aerodynamic speed control system for wind turbine
GB2536618A (en) * 2015-03-09 2016-09-28 Bell Gordon Air capture turbine
CN110700994A (en) * 2019-11-28 2020-01-17 珠海德光源新能源科技有限公司 Sectional type fan main shaft assembly and vertical axis wind turbine
CN110700993A (en) * 2019-11-28 2020-01-17 珠海德光源新能源科技有限公司 Split type vertical axis wind power generation system
CN110761942A (en) * 2019-11-28 2020-02-07 珠海德光源新能源科技有限公司 Fan blade of vertical axis wind driven generator and vertical axis wind driven generator
CN110778450A (en) * 2019-11-28 2020-02-11 珠海德光源新能源科技有限公司 Energy-saving power-assisted vertical axis wind power generation system
CN110821748A (en) * 2019-11-28 2020-02-21 珠海德光源新能源科技有限公司 Fan main shaft and vertical shaft wind driven generator

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CN102338043A (en) * 2011-08-11 2012-02-01 邓允河 Vertical shaft wind driven generator
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US4449053A (en) 1981-07-27 1984-05-15 Aluminum Company Of America Vertical axis wind turbine
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Publication number Priority date Publication date Assignee Title
WO2015128874A3 (en) * 2014-02-25 2015-12-10 Valagam Rajagopal Raghunathan An aerodynamic speed control system for wind turbine
GB2536618A (en) * 2015-03-09 2016-09-28 Bell Gordon Air capture turbine
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CN110700994A (en) * 2019-11-28 2020-01-17 珠海德光源新能源科技有限公司 Sectional type fan main shaft assembly and vertical axis wind turbine
CN110700993A (en) * 2019-11-28 2020-01-17 珠海德光源新能源科技有限公司 Split type vertical axis wind power generation system
CN110761942A (en) * 2019-11-28 2020-02-07 珠海德光源新能源科技有限公司 Fan blade of vertical axis wind driven generator and vertical axis wind driven generator
CN110778450A (en) * 2019-11-28 2020-02-11 珠海德光源新能源科技有限公司 Energy-saving power-assisted vertical axis wind power generation system
CN110821748A (en) * 2019-11-28 2020-02-21 珠海德光源新能源科技有限公司 Fan main shaft and vertical shaft wind driven generator

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