Vertical axis wind turbine with cambered airfoil blades
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-007/00
F03D-003/00
F03D-009/00
F03D-003/06
출원번호
US-0026668
(2013-09-13)
등록번호
US-9041239
(2015-05-26)
발명자
/ 주소
Epstein, Martin
Harms, Jon Eric
Stinson, William
Esposito, Claudio
출원인 / 주소
Epstein, Martin
대리인 / 주소
Pfeifer, Nicholas
인용정보
피인용 횟수 :
1인용 특허 :
3
초록▼
A wind turbine having blades that rotate in a horizontal plane about a vertical axis. A single output shaft is directly connected by one-way bearings to the driven shaft of a permanent magnet generator. This eliminates the need for a gearbox and also eliminates the need for inverters. Friction losse
A wind turbine having blades that rotate in a horizontal plane about a vertical axis. A single output shaft is directly connected by one-way bearings to the driven shaft of a permanent magnet generator. This eliminates the need for a gearbox and also eliminates the need for inverters. Friction losses are further reduced by suspending the vertical shaft with magnetic bearings. Airfoils are positioned in a specific vertical design so that they cup the wind on a lower concave portion of the airfoil for self-starting capability. Stealth radar-absorbing mesh and faceted mounting structures reduce scrambling of radar returns.
대표청구항▼
1. A vertical axis wind turbine, comprising: a top plate and a bottom plate in coaxial alignment along a center axis, the center axis being perpendicular to both the top and the bottom plates;a plurality of blades disposed between the top and the bottom plates in a symmetrical configuration about th
1. A vertical axis wind turbine, comprising: a top plate and a bottom plate in coaxial alignment along a center axis, the center axis being perpendicular to both the top and the bottom plates;a plurality of blades disposed between the top and the bottom plates in a symmetrical configuration about the center axis, each blade comprising at least one cambered airfoil, wherein a camber line at a leading edge of each airfoil is perpendicular to a normal to the center axis and the leading edge is closer to the center axis than the trailing edge;a shaft attached to the bottom plate, the shaft being in coaxial alignment with the center axis; anda generator having a stator and a rotor, the rotor being driven by the shaft, wherein the rotor and the shaft have the same angular velocity. 2. A vertical axis wind turbine according to claim 1, wherein between three and six blades are disposed between the top and the bottom plates. 3. A vertical axis wind turbine according to claim 1, wherein each blade comprises a leading airfoil and a trailing airfoil. 4. A vertical axis wind turbine according to claim 3, wherein the leading and the trailing airfoils are in a configuration where a line normal to the center axis and tangential to a trailing edge of the leading airfoil intersects the trailing airfoil at about one quarter of a chord length thereof. 5. A vertical axis wind turbine according to claim 1, further comprising a magnetic bearing supporting the shaft, the magnetic bearing configured to allow the shaft to rotate about the center axis and to stabilize the shaft in a vertical orientation. 6. A vertical axis wind turbine according to claim 5, wherein the magnetic bearing is a passive magnetic bearing. 7. A vertical axis wind turbine according to claim 5, wherein the magnetic bearing is an active magnetic bearing. 8. A vertical axis wind turbine according to claim 7, further comprising a control module and a battery in electrical communication with the active magnetic bearing, the control module configured to stabilize the shaft. 9. A vertical axis wind turbine according to claim 1, further comprising a one-way bearing configured to translate rotation of the shaft to the rotor of the generator. 10. A vertical axis wind turbine according to claim 1, wherein the generator is a permanent magnet generator. 11. A vertical axis wind turbine according to claim 1, further comprising a radar-absorbing mesh laterally enclosing the blades, the mesh configured to reduce radar reflective scrambling interference by eliminating random wave return from the blades. 12. A vertical axis wind turbine, comprising: a top plate and a bottom plate in coaxial alignment along a center axis, the center axis being perpendicular to both the top and the bottom plates;a plurality of blades disposed between the top and the bottom plates in a symmetrical configuration about the center axis, each blade comprising a leading and a trailing cambered airfoils, wherein a camber line at a leading edge of each airfoil is perpendicular to a normal to the center axis and the leading edge is closer to the center axis than the trailing edge;a shaft attached to the bottom plate, the shaft being in coaxial alignment with the center axis;a magnetic bearing supporting the shaft, the magnetic bearing configured to allow the shaft to rotate about the center axis;a permanent magnet generator having a stator and a rotor, the rotor being driven by the shaft via a one-way bearing, wherein no gears are being used to translate rotational motion of the shaft to the rotor, the rotor and the shaft having the same angular velocity. 13. A vertical axis wind turbine according to claim 12, wherein the leading and the trailing cambered airfoils are in a configuration where a line normal to the center axis and tangential to a trailing edge of the leading airfoil intersects the trailing airfoil at about one quarter of a chord length thereof. 14. A vertical axis wind turbine according to claim 12, wherein the magnetic bearing is a passive magnetic bearing. 15. A vertical axis wind turbine according to claim 12, wherein the magnetic bearing is an active magnetic bearing. 16. A vertical axis wind turbine according to claim 15, further comprising a control module and a battery in electrical communication with the active magnetic bearing, the control module configured to stabilize the shaft. 17. A vertical axis wind turbine according to claim 12, further comprising a radar-absorbing mesh laterally enclosing the blades, the mesh configured to reduce radar reflective scrambling interference by eliminating random wave return from the blades. 18. A vertical axis wind turbine according to claim 12, further comprising a fluidly sealed housing enclosing the generator and the magnetic bearing.
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