Closed loop multiple airfoil wind turbine

• US 10,683,841 B2
• Filed: 03/31/2016
• Issued: 06/16/2020
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Harvard M. Farrant
• Original Assignee: Harvard M. Farrant
• Inventors: Farrant, Harvard M.
• Primary Examiner(s): Hansen, Kenneth J
• Assistant Examiner(s): Marien, Andrew J
• Application Number:
  US15/562,797
• Publication Number:
  US 20180283350A1
• Time in Patent Office: 1,538 Days
• CPC Class Codes: F03D 5/02 the wind-engaging parts being attached to endless chains or the like
• CPC Class Codes: F03D 5/04 the wind-engaging parts being attached to carriages running on tracks or the like
• CPC Class Codes: F05B 2220/706 an electrical generator
• CPC Class Codes: F05B 2240/231 driven by aerodynamic lift effects
• CPC Class Codes: F05B 2240/912 on a tower
• CPC Class Codes: F05B 2250/14 elliptical
• CPC Class Codes: Y02E 10/70 Wind energy
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/728 Onshore wind turbines
• CPC Class Codes: Y02E 10/74 Wind turbines with rotation axis perpendicular to the wind direction

Abstract

Disclosed is a multiple blade wind turbine (MBWT). The MBWT includes: at least one rotor comprising two closed loop tracks positioned parallel or equidistant to one another and a plurality of airfoils interspaced within the tracks. The plurality of airfoils are connected at each end to one of said tracks and are fully rotatable with respect to said closed loop tracks. A transmission is connected to one of the tracks. The track drives the transmission and an electric generator is connected to said transmission for generating electricity. The rotors are oriented vertically or horizontally with respect to a vertical support structure that is used to support the rotors. The MBWT'"'"'s design allows the electric generator(s) and transmission system to be housed relatively close to ground level. This configuration reduces the mass of the central support tower and reduces the construction and ongoing maintenance costs.

Claims

1. A multiple blade wind turbine comprising:

at least one rotor comprising a set of closed loop tracks arranged in a single plane with respect to an airflow direction;

a plurality of airfoils interspaced within the set of closed loop tracks, wherein the set of closed loop tracks is oval;

wherein each of the plurality of airfoils have a leading edge, a trailing edge, a pressure side, a suction side, a chord length, and a span length;

wherein each of the plurality of airfoils is connected at each end to one of the set of closed loop tracks, where the leading edge and trailing edge are parallel to the single plane, and each of the plurality of airfoils are fully rotatable with respect to the single plane;

wherein the plane of the set of closed loop tracks is perpendicular to the airflow;

wherein each of the plurality of airfoils have a pitch angle between 15 and 90 degrees;

wherein each of the plurality of airfoils are spaced between 0.3 and 6.0 chord lengths apart;

a transmission mechanically coupled to the set of closed loop tracks, wherein the set of closed loop tracks drives the transmission; and

an electric generator connected to the transmission.

2. The multiple blade wind turbine of claim 1, further comprising:

a central support tower, wherein the central support tower is coupled to the at least one rotor.

3. The multiple blade wind turbine of claim 2,

wherein the at least one rotor is positioned in front of a central axis of the central support tower.

4. The multiple blade wind turbine of claim 2,

wherein the at least one rotor is maintained parallel to the central support tower.

5. The multiple blade wind turbine of claim 2,

wherein the central support tower is configured to support the at least one rotor.

6. The multiple blade wind turbine of claim 1, the transmission further comprising:

an adjustable-speed drive, a continuously variable transmission, or a hydraulic transmission.

7. The multiple blade wind turbine of claim 1, further comprising:

a generator housing that contains the electric generator and the transmission.

8. The multiple blade wind turbine of claim 1,

wherein the set of closed loop tracks comprises a set of drive belts or a set of drive chains.

9. The multiple blade wind turbine of claim 1, the transmission further comprising:

a gear box;

a gear assembly;

a gearbox axle;

wherein the gear assembly contains a sprocket which is coupled to a set of closed loop tracks;

wherein the gear assembly is connected to the gearbox axle;

wherein the gearbox axle is coupled to the gearbox;

wherein the gearbox is coupled to the electric generator.

10. A multiple blade wind turbine comprising:

at least one rotor comprising a set of closed loop tracks arranged in a single plane with respect to an airflow direction;

a plurality of airfoils interspaced within the set of closed loop tracks, wherein the set of closed loop tracks is oval,

wherein each of the plurality of airfoils have a leading edge, a trailing edge, a pressure side, a suction side, a chord length, and a span length;

wherein each of the plurality of airfoils is connected at each end to one of the set of closed loop tracks, where the leading edge and trailing edge are parallel to the single plane, and each of the plurality of airfoils are fully rotatable with respect to the single plane;

wherein the plane of the set of closed loop tracks is perpendicular to the airflow;

wherein each of the plurality of airfoils have a pitch angle between 15 and 90 degrees;

wherein each of the plurality of airfoils are spaced between 0.3 and 6.0 chord lengths apart;

a central support tower, wherein the central support tower is coupled to the at least one rotor;

a transmission mechanically coupled to the set of closed loop tracks, wherein the set of closed loop tracks drives the transmission;

an electric generator connected to the transmission; and

a generator housing that contains the electric generator and the transmission.

11. The multiple blade wind turbine of claim 10, the transmission further comprising:

an adjustable-speed drive, a continuously variable transmission, or a hydraulic transmission.

12. The multiple blade wind turbine of claim 10,

wherein the at least one rotor is positioned in front of a central axis of the central support tower.

13. The multiple blade wind turbine of claim 12,

wherein the at least one rotor is maintained parallel to the central support tower.

14. The multiple blade wind turbine of claim 12,

wherein the central support tower is configured to support the at least one rotor.

15. The multiple blade wind turbine of claim 12,

wherein the central support tower maintains the rotor in a fixed orientation with respect to the central support tower.

16. The multiple blade wind turbine of claim 10, the transmission further comprising:

a gear box;

a gear assembly;

a gearbox axle;

wherein the gear assembly contains a sprocket which is coupled to a set of closed loop tracks;

wherein the gear assembly is connected to the gearbox axle;

wherein the gearbox axle is coupled to the gearbox;

wherein the gearbox is coupled to the electric generator.

17. The multiple blade wind turbine of claim 10,

wherein the set of closed loop tracks comprises a set of drive belts or a set of drive chains.

18. A multiple blade wind turbine comprising:

at least one rotor comprising a set of closed loop tracks arranged in a single plane with respect to an airflow direction;

a plurality of airfoils interspaced within the set of closed loop tracks, wherein the set of closed loop tracks is oval,

wherein each of the plurality of airfoils have a leading edge, a trailing edge, a pressure side, a suction side, a chord length, and a span length;

wherein each of the plurality of airfoils is connected at each end to one of the set of closed loop tracks, where the leading edge and trailing edge are parallel to the single plane, and each of the plurality of airfoils are fully rotatable with respect to the single plane;

wherein the plane of the set of closed loop tracks is perpendicular to the airflow;

wherein the set of closed loop tracks comprises a set of drive belts or a set of drive chains;

wherein each of the plurality of airfoils have a pitch angle between 15 and 90 degrees;

wherein each of the plurality of airfoils are spaced between 0.3 and 6.0 chord lengths apart;

a central support tower, wherein the central support tower is coupled to the at least one rotor;

wherein the at least one rotor is positioned in front of a central axis of the central support tower;

wherein the at least one rotor is maintained parallel to the central support tower;

wherein the central support tower is configured to support the at least one rotor;

a transmission mechanically coupled to the set of closed loop tracks, wherein the set of closed loop tracks drives the transmission;

an electric generator connected to the transmission; and

wherein the transmission is either an adjustable-speed drive, a continuously variable transmission, or a hydraulic transmission;

wherein the transmission comprises

a gear box;

a gear assembly;

a gearbox axle;

wherein the gear assembly contains a sprocket which is coupled to a set of closed loop tracks;

wherein the gear assembly is connected to the gearbox axle;

wherein the gearbox axle is coupled to the gearbox;

wherein the gearbox is coupled to the electric generator;

a generator housing that contains the electric generator and the transmission.