초록 ▼

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 th

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).

대표청구항 ▼

A wind turbine rotor speed control system, comprising: a fixed turbine blade adapted to be mounted on a shaft for rotation by the wind; a pivotal blade tip mounted on each of the respective ends of the fixed blade, said blade tips being mounted on pitch axes substantially at right angles to the rota

A wind turbine rotor speed control system, comprising: a fixed turbine blade adapted to be mounted on a shaft for rotation by the wind; a pivotal blade tip mounted on each of the respective ends of the fixed blade, said blade tips being mounted on pitch axes substantially at right angles to the rotation axis of the fixed blade; said fixed blade having trailing edges in opposite directions on opposite sides of the rotation axis; a tab pivotally secured to and to trail from each of said respective trailing edges of said fixed blade; each tab being adapted to be aligned with the relative wind on the fixed blade; each tab being connected to a respective blade tip by linkage means; each linkage means being adapted to pivot the respective blade tip in accordance with the action of the relative wind on the tab; said pivoting of the blade tip effecting reduction of flapping and unloading of the tip blade, effecting unfeathering of the blade tip at the cut-in wind speed, effecting substantially constant blade R.P.M. from the cut-in to the rated wind velocity and at a gradually increasing shaft torque, and maintaining proper tip blade pitch schedule.