| 摘要 |
A wind turbine rotor speed control for ensuring a constant rotational speed within tight tolerances includes a self-sufficient rotor (16) incorporating aerodynamic and mechanical devices to provide the control. There is a fixed turbine blade (26) adapted to be mounted on a shaft (14) for rotation therewith, the fixed blade (26) having pivotal blade tips (28) at its respective ends. The pitch control of the blade tips regulates the rotor speed. Aerodynamic tabs (180) are pivotally secured adjacent each of the ends of the respective trailing edges (34, 36) of the fixed blade. The relative wind acts on each tab which is connected to a series of links (188-168) and pitch cams (86) to regulate the pitch of the blade tips from a feathered position (210), to a cut-in position (212), to a rated wind position, and vice-versa. There are torque cams (60) actuated by torsional strain on the shaft bearing which is connected to the shaft (14) and to the pitch cams (86) by a series of links ( 52, 54) so that as the wind approaches its rated velocity value the pitch cams (86) become ineffective (228) and the torque cams (60) take over the speed control. There are also overspeed centrifugal devices (80) connected to the pitch cams (86) to cause the blade tips (28) to feather in emergency overspeed conditions so as to stop the rotor (16).
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