Yaw System
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High Quality Content by WIKIPEDIA articles! The yaw system of wind turbines is the component responsible for the orientation of the wind turbine rotor towards the wind. The task of orientating the rotor into the wind was a complicated issue already for historical windmills. The first windmills able to rotate in order to "face" the wind appeared in the mid-1700s. Their rotatable nacelles were mounted on the main structure of the windmill using primitive wooden gliding bearings lubricated with animal fat. The necessary yawing torque was created by means of animal power, human power or even wind…mehr

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High Quality Content by WIKIPEDIA articles! The yaw system of wind turbines is the component responsible for the orientation of the wind turbine rotor towards the wind. The task of orientating the rotor into the wind was a complicated issue already for historical windmills. The first windmills able to rotate in order to "face" the wind appeared in the mid-1700s. Their rotatable nacelles were mounted on the main structure of the windmill using primitive wooden gliding bearings lubricated with animal fat. The necessary yawing torque was created by means of animal power, human power or even wind power (implementation of an auxiliary rotor known as fantail). Vertical axis wind turbines (VAWT) do not need a yaw system since their vertical rotors can face the wind from any direction and only their self rotation gives the blades a clear direction of the air flow. Horizontal axis wind turbines however need to orient their rotors into and out of the wind and they achieve that by means of passive or active yaw systems.