IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0899422
(2007-09-06)
|
등록번호 |
US-8246302
(2012-08-21)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Hamilton Sundstrand Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
11 |
초록
▼
A wind turbine system includes a shaft, a rotor for driving the shaft, and a first fluidic teeter control assembly. The rotor includes a first blade engaged to the shaft by a hub, and has a degree of freedom to pivot relative to the shaft. A first teeter angle is defined between an instantaneous pos
A wind turbine system includes a shaft, a rotor for driving the shaft, and a first fluidic teeter control assembly. The rotor includes a first blade engaged to the shaft by a hub, and has a degree of freedom to pivot relative to the shaft. A first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade. The first fluidic teeter control assembly is engaged between the rotor and the shaft for providing a first dynamic teeter restraining force as a function of the first teeter angle and a fluidic resistance. The first dynamic restraining force is relatively low when the first teeter angle is within a first teeter operation range, and the first dynamic restraining force is higher when the first teeter angle is outside that range.
대표청구항
▼
1. A wind turbine system comprising: a shaft;a rotor for driving the shaft, the rotor comprising a first blade engaged to the shaft by a hub, wherein the first blade has a degree of freedom to pivot relative to the shaft, and wherein a first teeter angle is defined between an instantaneous position
1. A wind turbine system comprising: a shaft;a rotor for driving the shaft, the rotor comprising a first blade engaged to the shaft by a hub, wherein the first blade has a degree of freedom to pivot relative to the shaft, and wherein a first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade; anda first fluidic teeter control assembly engaged between the rotor and the shaft for providing a first dynamic teeter restraining force as a function of the first teeter angle and a fluidic resistance, wherein the first dynamic restraining force is relatively low when the first teeter angle is within a first teeter operation range, and wherein the first dynamic restraining force varies such that the first dynamic restraining force is higher when the first teeter angle is outside the first teeter operation range, wherein the first fluidic teeter control assembly comprises: a piston tube that defines an interior surface, wherein the piston tube is connected to the shaft by a pin connection;a piston movable within the piston tube along a piston axis, wherein the piston is connected to the rotor by a pin connection;a working fluid, wherein the working fluid is displaced as a function of movement of the piston;a groove defined at or near the interior surface of the piston tube in a generally axial direction with respect to the piston axis for allowing the working fluid to pass between a first volume defined at a first side of the piston and a second volume defined at an opposite second side of the piston, wherein the groove has a radial depth, and wherein the radial depth varies along the piston axis; andan additional groove defined at or near the interior surface of the piston tube in the generally axial direction for allowing the working fluid to pass between the first volume and the second volume, wherein the groove and the additional groove have different axial lengths. 2. The system of claim 1, wherein the first fluidic teeter control assembly is engaged to the shaft. 3. The system of claim 1, wherein the groove has a relative maximum radial depth at or near a midpoint of the piston axis, and smaller radial depths at axial locations spaced from the midpoint of the piston axis. 4. The system of claim 1 and further comprising: a working fluid thermal condition controller for regulating thermal energy of the working fluid. 5. The system of claim 1 wherein the rotor further comprises a second blade engaged to the shaft by the hub, wherein the second blade has a degree of freedom to pivot relative to the shaft, and wherein a second teeter angle is defined between an instantaneous position of the second blade and a time-averaged plane of rotation of the second blade, the system further comprising: a second fluidic teeter control assembly engaged between the rotor and the shaft for providing a second dynamic teeter restraining force as a function of the second teeter angle, wherein the second dynamic restraining force is relatively low when the teeter angle is within a first teeter operation range, wherein the second dynamic restraining force is higher when the teeter angle is outside the first teeter operation range, and wherein the first and second dynamic restraining forces are independent from each other. 6. A teeter-controlled wind turbine system comprising: a support tower extending in a substantially vertical direction;a shaft supported relative to the support tower;a rotor for driving the shaft, the rotor comprising:a central hub;a first blade engaged to the shaft by the hub, wherein the first blade can pivot relative to the shaft such that a first teeter angle is defined between an instantaneous position of the first blade and a time-averaged plane of rotation of the first blade; anda second blade engaged to the shaft by a hub, wherein the second blade can pivot relative to the shaft such that a second teeter angle is defined between an instantaneous position of the second blade and a time-averaged plane of rotation of the second blade;a first fluidic teeter control assembly engaged between the rotor and the nacelle for restraining pivoting motion of the first blade as a function of the first teeter angle such that pivoting motion of the first blade is relatively lightly restrained when the first teeter angle is within a first teeter operation range and pivoting motion of the first blade is restrained more as the first teeter angle moves outside the first teeter operation range; anda second fluidic teeter control assembly engaged between the rotor and the nacelle for providing a second teeter restraining force as a function of the second teeter angle such that pivoting motion of the second blade is relatively lightly restrained when the second teeter angle is within the first teeter operation range and pivoting motion of the second blade is restrained more as the teeter angle moves outside the first teeter operation range, wherein the first and fluidic teeter control assemblies operate substantially independent from one another, wherein the first and second fluidic teeter control assemblies each comprise: a piston tube that defines an interior surface;a piston movable within the piston tube along a piston axis;a working fluid, wherein the working fluid is displaced as a function of movement of the piston;a groove located between each piston tube and piston, defined in a generally axial direction with respect to the piston axis, to allow the working fluid to pass between a first volume defined at a first side of the piston and a second volume defined at an opposite second side of the piston; andan additional groove located between each piston tube and piston, defined in the generally axial direction, to allow the working fluid to pass between the first volume and the second volume, wherein the groove and the additional groove have different axial lengths. 7. The system of claim 6, wherein the groove has a radial depth, and wherein the radial depth varies along the piston axis. 8. The system of claim 7, wherein the groove has a relative maximum radial depth at or near a midpoint of the piston axis, and progressively smaller radial depths at increasing axial distances from the midpoint of the piston axis. 9. The system of claim 7, wherein at least three grooves are defined in the interior surface of each piston tube. 10. A method of controlling teeter for a wind turbine having a rotatable shaft and a rotor having at least one blade extending therefrom that can teeter relative to the rotatable shaft, the method comprising: providing a dynamic teeter restraining force as a function of a teeter angle, wherein the dynamic teeter restraining force is relatively low when the teeter angle is within a first teeter operation range, and wherein the dynamic teeter restraining force is higher when the teeter angle is outside the first teeter operation range; andcontrolling the dynamic teeter restraining force solely by non-linearly adjusting fluidic resistance to flow of a working fluid. 11. The method of claim 10 and further comprising: sensing an azimuthal position of the blade; andadjusting the restraining force as a function of both the teeter angle and the azimuthal position of the blade. 12. The method of claim 10, wherein the dynamic teeter restraining force is controlled to allow substantially free teetering within the first teeter operation range, the first teeter operation range including a zero degree (0°) teeter angle. 13. The method of claim 12, wherein the first teeter operational range encompasses teeter angles between approximately +3° and −3°.
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