Wind turbine

Details Wind turbine Wind turbine

1981-10-19

1982-10-05

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

With gyroscopic reference means for rotor control

416132B, 416139, 416141, F03D 704

Patent

active

043526292

ABSTRACT:
A wind turbine of the type having an airfoil blade (15) mounted on a flexible beam (20) and a pitch governor (55) which selectively, torsionally twists the flexible beam in response to wind turbine speed thereby setting blade pitch, is provided with a limiter (85) which restricts unwanted pitch change at operating speeds due to torsional creep of the flexible beam. The limiter allows twisting of the beam by the governor under excessive wind velocity conditions to orient the blades in stall pitch positions, thereby preventing overspeed operation of the turbine. In the preferred embodiment, the pitch governor comprises a pendulum (65,70) which responds to changing rotor speed by pivotal movement, the limiter comprising a resilient member (90) which engages an end of the pendulum to restrict further movement thereof, and in turn restrict beam creep and unwanted blade pitch misadjustment.

REFERENCES:
patent: 4003676 (1977-01-01), Sweeney et al.
patent: 4006925 (1977-02-01), Scherer
patent: 4025230 (1977-05-01), Kastan
patent: 4083651 (1978-04-01), Cheney et al.
patent: 4084921 (1978-04-01), Norz
patent: 4111601 (1978-09-01), Richard
patent: 4201514 (1980-05-01), Huetter

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