Wind driven turbine with fixed pitch blades - and speed control by varying angle of inclination of rotor axis

摘要

The turbine rotor (1) is provided with helicoidal blades of fixed pitch. The rotor is mounted on a shaft which pivots about a horizontal spindle and is provided with a balance weight. The spindle is mounted in bearings on a pylon. When the wind speed is low the rotor axis is held in the vertical position by the balance weight (2). As the wind speed increases the axis rotates until the moment exerted by the balance weight balances the force exerted by the wind. The effective angle of incidence of the helicoidal blades is reduced so that the rotor maintains a constant speed irrespective of the wind speed.