A yawing system (2) for a wind turbine and a method of operating the yawing system (2) are disclosed. The yawing system (2) comprises at least one yaw drive arranged to cause the yawing system (2) to perform yawing movements, a yaw bearing allowing mutual movement between two parts of the yawing sys
A yawing system (2) for a wind turbine and a method of operating the yawing system (2) are disclosed. The yawing system (2) comprises at least one yaw drive arranged to cause the yawing system (2) to perform yawing movements, a yaw bearing allowing mutual movement between two parts of the yawing system (2) during yawing movements, and a hydraulically driven preload mechanism (1) being adapted to provide an adjustable pre-load force to the yaw bearing. The preload mechanism (1) is automatically operated as a consequence of operating the yawing system (2). Thereby it can be ensured that the preload force is adjusted in accordance with whether yawing movements are being performed, or the position of the nacelle should be maintained. The preload mechanism (1) may be modular, in the sense that two or more preload mechanisms (1) operate independently of each other, thereby providing redundancy.
대표청구항▼
1. A method of operating a yawing system for a wind turbine, the yawing system including a hydraulically driven preload mechanism having a hydraulically operated piston, an accumulator, and a valve switchable between a first position establishing a fluid connection between the hydraulically operated
1. A method of operating a yawing system for a wind turbine, the yawing system including a hydraulically driven preload mechanism having a hydraulically operated piston, an accumulator, and a valve switchable between a first position establishing a fluid connection between the hydraulically operated piston and the accumulator and a second position establishing a fluid connection between the hydraulically operated piston and a tank, the method comprising the steps of: applying a preload force to a yaw bearing of the yawing system when the yawing system is not performing yawing movements, wherein the valve is in the first position so that pressure in the accumulator causes the hydraulically operated piston to apply the preload force,moving the valve to the second position, thereby allowing fluid to flow from the hydraulically operated piston to the tank, via the established fluid connection, to release the preload force provided by the hydraulically operated piston, andoperating the yawing system to perform yawing movements, wherein said operation of the yawing system automatically causes a pump to operate to supply fluid to the accumulator. 2. The method according to claim 1, further comprising: stopping operation of the yawing system, andmoving the valve to the first position, thereby allowing fluid to flow from the accumulator to the hydraulically operated piston, via the established fluid connection, so that pressure in the accumulator causes the hydraulically operated piston to apply a preload force. 3. The method according to claim 1, wherein the step of operating the yawing system comprises driving the pump by means of a ring gear of the yawing system. 4. The method according to claim 1, wherein the step of moving the valve is controlled by means of a control unit. 5. The method according to claim 4, wherein the control unit controls movements of the valve between the first position and the second position in response to an electronic, mechanical, or hydraulic signal. 6. The method according to claim 1, wherein the step of moving the valve to the second position and the step of operating the yawing system are initiated simultaneously. 7. A yawing system for a wind turbine, the yawing system comprising: at least one yaw drive arranged to cause the yawing system to perform yawing movements,a yaw bearing allowing mutual movement between two parts of the yawing system during yawing movements,a hydraulically driven preload mechanism having at least one pump configured to be automatically operated as a consequence of operating the yawing system, at least one hydraulically operated piston being arranged to provide a preload force to the yaw bearing, at least one accumulator, and a valve being switchable between a first position establishing a fluid connection between the hydraulically operated piston and the accumulator and a second position establishing a fluid connection between the hydraulically operated piston and a tank, anda control unit configured to switch the valve from the first position to the second position when the yawing system performs yawing movements,wherein a pressure is automatically built up in the accumulator as a consequence of operating the yawing system. 8. The yawing system according to claim 7, wherein the control unit is configured to control movements of the valve between the first position and the second position in response to an electronic, mechanical or hydraulic signal. 9. The yawing system according to claim 7, wherein the preload force provided by the hydraulically operated piston increases when the valve is in the first position, and decreases when the valve is in the second position. 10. The yawing system according to claim 7, wherein the yaw bearing is a friction bearing. 11. The yawing system according to claim 10, wherein at least a portion of the preload mechanism constitutes at least a portion of the friction bearing. 12. The yawing system according to claim 7, wherein the preload mechanism is arranged to provide friction between two surfaces. 13. The yawing system according to claim 7, said yawing system comprising at least two preload mechanisms, each preload mechanism being adapted to provide an adjustable preload force to the yaw bearing, and each preload mechanism being automatically operated as a consequence of operating the yawing system. 14. The yawing system according to claim 13, wherein the preload mechanisms are operated independently of each other. 15. The yawing system according to claim 7, wherein the valve is biased toward the first position. 16. A yawing system for a wind turbine, the yawing system comprising: at least one yaw drive arranged to cause the yawing system to perform yawing movements,a yaw bearing allowing mutual movement between two parts of the yawing system during yawing movements,a hydraulically driven preload mechanism having at least one pump configured to be automatically operated as a consequence of operating the yawing system, at least one hydraulically operated piston being arranged to provide a preload force to the yaw bearing, at least one accumulator, and a valve being switchable between a first position establishing a fluid connection between the hydraulically operated piston and the accumulator and a second position establishing a fluid connection between the hydraulically operated piston and a tank, anda control unit configured to switch the valve from the first position to the second position when the yawing system performs yawing movements, wherein the pump is driven by a ring gear of the yawing system. 17. The yawing system according to claim 16, wherein the control unit is configured to control movements of the valve between the first position and the second position in response to an electronic, mechanical or hydraulic signal. 18. The yawing system according to claim 16, wherein the preload force provided by the hydraulically operated piston increases when the valve is in the first position, and decreases when the valve is in the second position. 19. The yawing system according to claim 16, wherein the yaw bearing is a friction bearing. 20. The yawing system according to claim 16, wherein the valve is biased toward the first position.
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이 특허에 인용된 특허 (5)
Trede, Alf; Bruckner, Matthias, Apparatus for rotating the nacelle of a wind turbine.
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