| 摘要 |
PCT No. PCT/SE96/01604 Sec. 371 Date Jun. 10, 1998 Sec. 102(e) Date Jun. 10, 1998 PCT Filed Dec. 6, 1996 PCT Pub. No. WO97/22804 PCT Pub. Date Jun. 26, 1997A yawing system for a wind turbine is provided. The system adjusts the wind turbine into a required wind direction against the wind by turning the turbine about a yawing axle (14) and counteracts periodic vibrations in a nacelle of the turbine as it turns around the yawing axle from being transmitted as pulsating moments to a tower structure. At least one hydraulic motor (34) turns the nacelle (12) about the yawing axle (14). A controllable throttle valve (50) is disposed in a parallel line to the hydraulic motor (34). A regulator (30) is capable of changing an opening diameter of said throttle valve (50) in accordance with a position of the nacelle in relation to the wind direction such that the periodic vibrations are utilized for turning the nacelle and correcting for changes in the wind direction during operation by a successive movement of the nacelle in small steps in the required wind direction during each periodic vibration around the yawing axle and at the same time as the nacelle is dampened. |
