CN110578655A - Wind power generator - Google Patents
Wind power generator Download PDFInfo
- Publication number
- CN110578655A CN110578655A CN201910977880.0A CN201910977880A CN110578655A CN 110578655 A CN110578655 A CN 110578655A CN 201910977880 A CN201910977880 A CN 201910977880A CN 110578655 A CN110578655 A CN 110578655A
- Authority
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- China
- Prior art keywords
- motor
- end cover
- shell
- main shaft
- limiting piece
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process 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
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
-
- 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
-
- 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
-
- 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)
- 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)
- Power Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to a wind driven generator, which comprises a fan main shaft, fan blades and a motor part of a fan, and is characterized in that: the motor part comprises a shell, a generator stator and a generator rotor, wherein the shell is formed by connecting a motor upper end cover and a motor lower end cover; a concentricity limiting structure is arranged between the upper end cover of the motor and the lower end cover of the motor; the concentricity limiting structure comprises an upper limiting piece arranged at the lower end part of the upper end cover of the motor and a lower limiting piece arranged at the upper end part of the lower end cover of the motor; the upper limiting piece and the lower limiting piece are matched with each other to form mutual attachment in the radial direction, and the radial limiting surface of the concentricity of the upper end cover of the motor and the lower end cover of the motor can be limited. The invention can ensure the concentricity, the stress is more balanced during the assembly, and the conversion of the stress point from point to surface ensures that the fan can stably run under severe environment.
Description
Technical Field
The invention belongs to the technical field of small wind driven generators, and particularly relates to a wind driven generator.
Background
The conventional wind driven generator (such as a spiral wind driven generator) is complex in overall production and assembly process, a motor rotor, an end cover and a main shaft are independent, and the motor is fixed only by 4 bolts without a positioning device after the overall assembly of the motor is finished. The drawbacks and consequences of this are: (1) during assembly, loosening caused by the fact that very individual bolts are not assembled according to the tightening torque exists; (2) in the long-term use process of customers, the bolt shows loosening signs. Above-mentioned two kinds of circumstances can lead to the fan to have very big potential safety hazard, under the strong wind condition (if during strong typhoon), fan axial force grow, shake, cluster move the aggravation, unable normal operating can cause the fan to damage under the extreme condition, leads to the fact economic loss for the customer.
In addition, the middle main shaft of the conventional wind driven generator (such as a spiral wind driven generator) is simple and crude in processing and assembling, and lacks safety guarantee. The following drawbacks exist: (1) after the conventional main shaft is machined, the upper end cover of the fan is directly inserted and welded, and the concentricity of the fan cannot be ensured; (2) because the main shaft is formed by processing a hollow steel pipe, the strength requirement cannot be ensured on the connecting surface of the main shaft and the end cover; (3) the motor main body and the main shaft are troublesome to assemble, the coaxiality requirement of each part cannot be guaranteed, and the quality of the fan after the assembly is doubtful; (3) the motor of the fan is internally provided with only one single bearing, and due to the machining precision problem and long-term operation abrasion, a rotor shaft of the fan can be caused to move back and forth in a serial mode, so that once the phenomenon is generated, potential safety hazards exist in the operation of the fan.
Disclosure of Invention
The invention aims to provide a wind driven generator, which ensures the concentricity, has more balanced stress during assembly and ensures that a fan can stably run in a severe environment by point-to-surface conversion of stress points.
In order to solve the technical problems, the invention adopts a technical scheme that: the wind driven generator comprises a fan main shaft, fan blades and a motor part of a fan, and is characterized in that: the motor part comprises a shell, a generator stator and a generator rotor, wherein the shell is formed by connecting a motor upper end cover and a motor lower end cover; a concentricity limiting structure is arranged between the upper end cover of the motor and the lower end cover of the motor; the concentricity limiting structure comprises an upper limiting piece arranged at the lower end part of the upper end cover of the motor and a lower limiting piece arranged at the upper end part of the lower end cover of the motor; the upper limiting piece and the lower limiting piece are matched with each other to form mutual attachment in the radial direction, and the radial limiting surface of the concentricity of the upper end cover of the motor and the lower end cover of the motor can be limited.
Furthermore, the generator rotor is fixed at the lower end of the fan main shaft and rotates along with the fan main shaft; the generator stator is fixedly arranged in the shell, and the main shaft of the fan is in running fit with the shell.
Furthermore, a fan main shaft of the wind driven generator is fixed with a shell formed by connecting an upper end cover of the motor and a lower end cover of the motor, and the shell rotates along with the fan main shaft.
Further, the radial limiting surface is a circular surface along the circumferential surface of the shell, or a plurality of sections of circular arc surfaces uniformly arranged along the shell.
furthermore, the upper limiting piece is an upper step surface arranged at the lower end part of the upper end cover of the motor, and the lower limiting piece is a lower step surface arranged at the upper end part of the lower end cover of the motor; the upper step surface is a circular step surface arranged along the circumferential direction of the upper end cover of the motor, and the lower step surface is a circular step surface arranged along the circumferential direction of the lower end cover of the motor; the surfaces which are mutually attached and formed in the radial direction after the upper step surface and the lower step surface are mutually matched are also circular surfaces along the circumferential direction.
furthermore, the upper limiting piece is an upper step surface arranged at the lower end part of the upper end cover of the motor, and the lower limiting piece is a lower step surface arranged at the upper end part of the lower end cover of the motor; the upper step surface is provided with a plurality of arc-shaped step surfaces which are uniformly distributed along the circumferential direction of the upper end cover of the motor, and the lower step surface is provided with a plurality of arc-shaped step surfaces which are uniformly distributed along the circumferential direction of the lower end cover of the motor; the lower step surfaces correspond to the upper step surfaces one to one and are mutually attached, and a plurality of arc-shaped attaching surfaces which are distributed discontinuously are formed in the circumferential direction of the shell.
Furthermore, the upper limiting piece is an upper groove formed in the lower end portion of the upper end cover of the motor, the lower limiting piece is a lower protrusion formed in the upper end portion of the lower end cover of the motor, and the upper groove and the lower protrusion are matched with each other to form a radial limiting surface.
Furthermore, the upper limiting piece is a lower protrusion arranged at the upper end part of the lower end cover of the motor, the lower limiting piece is an upper groove arranged at the lower end part of the upper end cover of the motor, and the upper groove and the lower protrusion are matched with each other to form a radial limiting surface.
Furthermore, the fan main shaft is in running fit with the upper end cover of the motor and the lower end cover of the motor through an upper bearing and a lower bearing respectively; the upper bearing and the lower bearing are respectively pressed into the central holes of the upper end cover and the lower end cover of the motor.
Further, the fan main shaft is integrally processed into a hollow shaft body by adopting steel.
Further, the generator stator is arranged on positioning steps of the upper end cover and the lower end cover of the motor.
The invention has the following advantages:
(1) The upper end cover and the lower end cover adopt the design of the step concave-convex groove, the stress is more balanced during the assembly, and the fan can stably run under the severe environment due to the point-to-surface conversion of the stress point.
(2) The invention greatly improves the working efficiency during assembly. Compared with the traditional wind driven generator (especially a spiral wind driven generator), the whole assembly is more convenient and faster, the assembly efficiency can be improved by 30 percent through effective data statistics, and the purchase order of a large quantity of fans in a short time by a client can be met.
(3) The wind driven generator provided by the invention has the advantages that the overall safety performance is effectively ensured, and the technical requirements that the traditional wind driven generator (especially a spiral wind driven generator) has more parts and can not strictly ensure the concentricity of all the parts during assembly are thoroughly avoided. The invention adopts key parts to assemble and integrate, ensures the concentricity, ensures the stable operation of each key part on the coaxial line when the fan operates, and solves the problem of jitter of the fan after long-term operation.
(4) The invention adopts the arrangement of the upper bearing and the lower bearing to replace the traditional single bearing, and the arrangement form can avoid the phenomenon of the fan moving after long-term test, thereby further ensuring the operation safety and the service life of the fan.
drawings
Fig. 1 is a schematic exploded view of a wind turbine according to the present invention.
Fig. 2 is a schematic structural diagram of a housing according to a first embodiment.
description of reference numerals: 1-a fan main shaft, 2-a fan blade, 3-a motor part, 4-a fan blade mounting rod, 5-a flange base, 301-a motor upper end cover, 302-a motor lower end cover, 303-a generator stator, 304-a generator rotor, 305-an upper bearing, 306-a lower bearing, 307-a first bushing, 308-a second bushing, 309-a first bearing retainer ring, 310-a second bearing retainer ring, 311-a locking nut, 312-an end cover fixing piece, 601-an upper step surface and 602-a lower step surface.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The first embodiment is as follows:
As shown in fig. 1: in the embodiment, a spiral wind driven generator is taken as an example to explain the structure of the wind driven generator, and the structure comprises a fan main shaft 1, fan blades 2 and a motor part 3 of a fan, wherein the fan blades 2 are spiral blades, the spiral blades are arranged on the fan main shaft 1 through a fan blade mounting rod 4, the fan main shaft 1 is integrally processed into a hollow shaft body by adopting 45# steel, the existing hollow steel pipe is replaced, the overall strength can be increased, and the fan stability in extreme weather is improved; the motor part 3 comprises a motor upper end cover 301, a motor lower end cover 302, a generator stator 303, a generator rotor 304, an upper bearing 305, a lower bearing 306, a first bushing 307, a second bushing 308, a first bearing retainer 309, a second bearing retainer 310 and a locking nut 311; the motor upper end cover 301 and the motor lower end cover 302 are connected through four sets of end cover fixing pieces 312 to form a housing for mounting the generator stator 303 and the generator rotor 304, and in this embodiment, the end cover fixing pieces 312 are bolt and nut pieces; the generator stator 303 is arranged on positioning steps of the upper motor end cover 301 and the lower motor end cover 302, and the generator stator 303 is relatively fixed with a shell formed by the upper motor end cover 301 and the lower motor end cover 302; the lower end of the fan main shaft 1 is inserted into the shell, a generator rotor 304 is arranged on a step at the lower end of the fan main shaft 1, and the generator rotor 304 and the fan main shaft 1 are relatively fixed and rotate along with the fan main shaft 1; the fan main shaft 1 is in running fit with the motor upper end cover 301 and the motor lower end cover 302 through an upper bearing 305 and a lower bearing 306 respectively; the upper bearing 305 and the lower bearing 306 are pressed into the central holes of the upper end cover 301 and the lower end cover 302 of the motor, the upper end of the upper bearing 305 is provided with a first bearing retainer ring 309, a first bushing 307 is arranged between the lower end of the upper bearing 305 and the generator rotor 304, the lower end of the lower bearing 306 is provided with a second bearing retainer ring 310, and a second bushing 308 is arranged between the upper end of the lower bearing 306 and the generator rotor 304; the blower main shaft 1 is provided with a locking nut 311 extending out of the lower end of the housing, and in this embodiment, the locking nut 311 may be a cap nut or the like.
A concentricity limiting structure is arranged between the upper end cover 301 of the motor and the lower end cover 302 of the motor; the concentricity limiting structure comprises an upper step surface 601 arranged at the lower end part of the upper end cover 301 of the motor and a lower step surface 602 arranged at the upper end part of the lower end cover 302 of the motor, after the upper end cover 301 of the motor and the lower end cover 302 of the motor are assembled together, the upper step surface 601 and the lower step surface 602 are provided with surfaces which are mutually attached in the radial direction to form a radial limiting surface, the mutually attached limiting surfaces can enable stress points to be converted into one surface from the former four points when the upper end cover 301 of the motor and the lower end cover 302 of the motor are installed, the requirement of the concentricity of the fan is guaranteed by the conversion of the points and the surfaces, and meanwhile, the installation is convenient.
in this embodiment, the upper step surface 601 is a circular step surface arranged along the circumferential direction of the upper end cover 301 of the motor, and the lower step surface 602 is a circular step surface arranged along the circumferential direction of the lower end cover 302 of the motor; the surfaces, which are formed in the radial direction after the upper step surface 601 and the lower step surface 602 are matched with each other, are also circular surfaces along the circumferential direction.
The bottom of the motor part 3 is provided with a flange base 5.
The working principle of the wind driven generator in the embodiment is as follows: the fan main shaft 1 and the generator rotor 304 are relatively fixed, when a fan blade 2 on the fan main shaft 1 bears wind power to rotate, the generator rotor 304 is driven to rotate, and the fan main shaft 1 and a shell formed by the motor upper end cover 301 and the motor lower end cover 302 are arranged in a relatively rotating mode, so that the shell is kept still in the rotating process of the generator rotor 304. In the traditional wind driven generator structure, a fan main shaft is only used for installing fan blades, and a shell can rotate along with the fan main shaft. In this embodiment, the fan main shaft 1 and the generator rotor 304 form an integrated assembly structure through the structure, so that the centers of the fan main shaft 1, the generator rotor 304, the upper bearing 305 and the lower bearing 306 can be ensured to be on the same axis, and the problems of fan shaking and fan blade scattering caused by unqualified fan concentricity are effectively solved. Meanwhile, due to the adoption of the structural arrangement of the upper bearing and the lower bearing in the embodiment, the overall strength of the fan is improved, and the movement of the main shaft of the fan is avoided.
Example two:
The wind power generator in this embodiment may be a type other than a helical wind power generator, such as an H-type wind power generator, a cage type wind power generator, and the like.
Example three:
In this embodiment, a fan main shaft 1 of the wind driven generator is fixed to a housing formed by connecting a motor upper end cover 301 and a motor lower end cover 302, and when the fan main shaft 1 rotates, the housing rotates along with the fan main shaft; the arrangement of the concentricity limiting structure between the upper motor end cover 301 and the lower motor end cover 302 is the same as that of the first embodiment.
Example four:
In this embodiment, on the basis of the first embodiment or the third embodiment, the upper step surface 601 is set as a plurality of (generally not less than four) arc-shaped step surfaces uniformly arranged along the circumferential direction of the upper end cover 301 of the motor, and the lower step surface 602 is set as a plurality of arc-shaped step surfaces uniformly arranged along the circumferential direction of the lower end cover 302 of the motor; after the upper motor end cover 301 and the lower motor end cover 302 are mounted with each other, the lower step surfaces 602 correspond to the upper step surfaces 601 one to one and are attached to each other, a plurality of arc-shaped attaching surfaces distributed discontinuously are formed in the circumferential direction of the shell, and the requirement for guaranteeing the concentricity of the fan can be met.
Example five:
In this embodiment, on the basis of the first embodiment or the third embodiment, a concentricity limit structure is arranged between the motor upper end cover 301 and the motor lower end cover 302; the concentricity limiting structure comprises an upper groove arranged at the lower end part of the upper end cover 301 of the motor and a lower protrusion arranged at the upper end part of the lower end cover 302 of the motor, and after the upper end cover 301 of the motor and the lower end cover 302 of the motor are assembled together, the upper groove and the lower protrusion are mutually matched to form a radial limiting surface.
Claims (11)
1. A wind power generator comprises a fan main shaft (1), a fan blade (2) and a motor part (3) of a fan, and is characterized in that: the motor part (3) comprises a shell, a generator stator (303) and a generator rotor (304), wherein the shell is formed by connecting a motor upper end cover (301) and a motor lower end cover (302), the generator stator (303) and the generator rotor (304) are installed in the shell, and the lower end of the fan main shaft (1) extends into the shell and is connected with the generator rotor (304); a concentricity limiting structure is arranged between the upper end cover (301) of the motor and the lower end cover (302) of the motor; the concentricity limiting structure comprises an upper limiting piece arranged at the lower end part of the upper end cover (301) of the motor and a lower limiting piece arranged at the upper end part of the lower end cover (302) of the motor; the upper limiting piece and the lower limiting piece are matched with each other to form mutual fit in the radial direction, and the radial limiting surface of the concentricity of the upper end cover (301) of the motor and the lower end cover (302) of the motor can be limited.
2. A wind power generator as claimed in claim 1, wherein: the generator rotor (304) is fixed at the lower end of the fan main shaft (1), and the generator rotor (304) rotates along with the fan main shaft (1); the generator stator (303) is fixedly arranged in the shell, and the fan main shaft (1) is in running fit with the shell.
3. A wind power generator as claimed in claim 1, wherein: a fan main shaft (1) of the wind driven generator is fixed with a shell formed by connecting a motor upper end cover (301) and a motor lower end cover (302), and the shell rotates along with the fan main shaft (1).
4. A wind power generator as claimed in claim 2 or 3, characterized in that: the radial limiting surface is a circular surface along the circumferential surface of the shell or a plurality of sections of circular arc surfaces which are uniformly arranged along the shell.
5. A wind power generator as claimed in claim 2 or 3, characterized in that: the upper limiting piece is an upper step surface (601) arranged at the lower end part of the upper end cover (301) of the motor, and the lower limiting piece is a lower step surface (602) arranged at the upper end part of the lower end cover (302) of the motor; the upper step surface (601) is a circular step surface arranged along the circumferential direction of the upper end cover (301) of the motor, and the lower step surface (602) is a circular step surface arranged along the circumferential direction of the lower end cover (302) of the motor; the surfaces which are formed in the radial direction after the upper step surface (601) and the lower step surface (602) are matched with each other are also circular surfaces along the circumferential direction.
6. A wind power generator as claimed in claim 2 or 3, characterized in that: the upper limiting piece is an upper step surface (601) arranged at the lower end part of the upper end cover (301) of the motor, and the lower limiting piece is a lower step surface (602) arranged at the upper end part of the lower end cover (302) of the motor; the upper step surface (601) is provided with a plurality of sections of arc-shaped step surfaces which are uniformly arranged along the circumferential direction of the upper end cover (301) of the motor, and the lower step surface (602) is provided with a plurality of sections of arc-shaped step surfaces which are uniformly arranged along the circumferential direction of the lower end cover (302) of the motor; the lower step surfaces (602) and the upper step surfaces (601) are in one-to-one correspondence and are mutually attached, and a plurality of arc-shaped attaching surfaces which are distributed discontinuously are formed in the circumferential direction of the shell.
7. A wind power generator as claimed in claim 2 or 3, characterized in that: the upper limiting piece is an upper groove arranged at the lower end part of the upper end cover (301) of the motor, the lower limiting piece is a lower protrusion arranged at the upper end part of the lower end cover (302) of the motor, and the upper groove and the lower protrusion are matched with each other to form a radial limiting surface.
8. A wind power generator as claimed in claim 2 or 3, characterized in that: the upper limiting piece is a lower protrusion arranged at the upper end of the lower end cover (302) of the motor, the lower limiting piece is an upper groove arranged at the lower end of the upper end cover (301) of the motor, and the upper groove and the lower protrusion are matched with each other to form a radial limiting surface.
9. A wind power generator as claimed in claim 2, wherein: the fan main shaft (1) is in running fit with the motor upper end cover (301) and the motor lower end cover (302) through an upper bearing (304) and a lower bearing (306) respectively; the upper bearing (305) and the lower bearing (306) are pressed into the central holes of the upper end cover (301) and the lower end cover (302) of the motor respectively.
10. a wind power generator as claimed in claim 2, wherein: the fan main shaft (1) is integrally processed into a hollow shaft body by adopting steel.
11. A wind power generator as claimed in claim 2, wherein: and the generator stator (303) is arranged on positioning steps of the upper end cover (301) and the lower end cover (302) of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977880.0A CN110578655A (en) | 2019-10-15 | 2019-10-15 | Wind power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977880.0A CN110578655A (en) | 2019-10-15 | 2019-10-15 | Wind power generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110578655A true CN110578655A (en) | 2019-12-17 |
Family
ID=68814902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910977880.0A Pending CN110578655A (en) | 2019-10-15 | 2019-10-15 | Wind power generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110578655A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347676A (en) * | 2010-07-30 | 2012-02-08 | 浙江三花股份有限公司 | Direct-current brushless motor and drainage pump |
| CN210829603U (en) * | 2019-10-15 | 2020-06-23 | 江苏乃尔风电技术开发有限公司 | Wind power generator |
-
2019
- 2019-10-15 CN CN201910977880.0A patent/CN110578655A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347676A (en) * | 2010-07-30 | 2012-02-08 | 浙江三花股份有限公司 | Direct-current brushless motor and drainage pump |
| CN210829603U (en) * | 2019-10-15 | 2020-06-23 | 江苏乃尔风电技术开发有限公司 | Wind power generator |
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