How do the windmills in windfarms all point in the same direction?

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Offline turnipsock

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I'm guessing there is some gizmo that picks up the wind direction and turns the windmills to face the wind but I can't see anything on top of them.

Does anybody know how it's done?
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Offline Madidus_Scientia

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Wouldn't they just naturally swivel that way?

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Offline Don_1

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I would think that a close by wind direction vain governs which way the windmills face. Just a guess.
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Offline elmejor

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Wouldn't they just naturally swivel that way?
even i would like to believe that they swivel naturally coz of air pressure

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Offline Don_1

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Wouldn't they just naturally swivel that way?
even i would like to believe that they swivel naturally coz of air pressure

This might be possible in strong winds, but lighter winds would not be able to turn such a heavy unit. I should think they would be turned by electric motors.
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blakestyger

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Each up-wind turbine unit has a wind vane mounted outside at the back. This measures wind direction and sends a signal to the yaw drive (top of the upright, below the nacelle) to orientate the turbine to head-wind. I've never seen a down-wind type (doesn't need a mechanism) and Norfolk's littered with turbines.

There's a simplified drawing and explanation at:

http://www1.eere.energy.gov/windandhydro/wind_how.html
« Last Edit: 04/12/2008 15:12:30 by blakestyger »

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Offline erickejah

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so the data gathered from the anemometer is processed and transformed to a signal that feeds the Yaw drive -the yaw drive is used to keep the rotor facing into the wind as the wind direction changes-.

 [:o] very interesting