Means for limiting rotation speed of a vertical shaft wind turbine
Means for limiting rotational speed in a vertical shaft wind turbine having a central hub and spokes extending therefrom. Spokes lying over each other support at their ends turbine blades placed concentrically around the turbine shaft. Each turbine blade is pivotable around a vertical axle (CA), and a leaf spring bundle is in each spoke placed between the turbine blade and the base of the spoke in order to adjust, when the turbine is at a rest, the turbine blade chord angle (b) in to a predetermined position and taking awn unloaded state in which its center of gravity (CG) is located near and, as seen in the direction of rotation of the turbine, behind a plane through the symmetry axis (CB) of the turbine shaft and the pivot axle (CA) of the turbine blade. The pivot axle (CA) of the turbine blade has such a position that the torque of the wind forces (P) around the pivot axle is reduced to a minimum. The spring bundle is dimensioned to exert a great resistance to deflection when the urbine rotates at operation speed, the chord angle of the turbine blade thereby remaining essentially unchanged, and in order to deflect gradually and faster and faster at higher rotation speeds beyond operation speed resulting in a readjustment of the turbine blade in a direction for limiting the rotation speed.
- Assignee:
- Saab-Scania Aktiebolag (Sweden)
- Patent Number(s):
- US 4452568
- OSTI ID:
- 6473151
- Resource Relation:
- Patent Priority Date: Priority date 11 May 1982, Sweden; Other Information: PAT-APPL-456038
- Country of Publication:
- United States
- Language:
- English
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