Active control system for high speed windmills

Details Active control system for high speed windmills Active control system for high speed windmills

1986-06-19

1988-01-12

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417336, 60398, 416170R, 74 41, 74833, F04B 4900, F04B 1702, F16H 3508

Patent

active

047188251

ABSTRACT:
A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed.

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patent: 3957397 (1976-05-01), Wendler
patent: 4392785 (1983-07-01), Avery
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patent: 4576064 (1986-03-01), Kentfield

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