Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Control of drive brake or clutch
Patent
1985-12-24
1987-12-29
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Control of drive brake or clutch
416 23, 416169R, F03D 704
Patent
active
047157828
ABSTRACT:
A hydraulic speed control device for limiting the speed of a wind turbine rotor by controlling the deployment of rotor braking devices includes four fluidicly interconnected elements: one or more fluid cylinders, a relief valve, an accumulator, and a check valve. Each of the fluid cylinders is mechanically coupled between a blade and an associated rotor braking device, and controls the movement of the rotor braking device between its aligned and braking positions. The relief valve opens to fluidicly connect the fluid cylinders and the accumulator when the rotational speed of the rotor exceeds a limit value. The accumulator receives fluid through the relief valve when the relief valve opens, thereby reducing the fluid pressure in the fluid cylinders and allowing the rotor braking devices to move from their aligned positions to their braking positions. The check valve permits fluid flow from the accumulator toward the fluid cylinders to return the rotor braking devices to their aligned positions when the rotational speed of the rotor has sufficiently slowed.
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Fayette Manufacturing Corp.
Powell Jr. Everette A.
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