Active control system for high speed windmills
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.
- Inventors:
-
- 45-437 Akimala St., Honolulu, HI 96744
- Issue Date:
- Research Org.:
- Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)
- OSTI Identifier:
- 866468
- Patent Number(s):
- 4718825
- Assignee:
- Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)
- Patent Classifications (CPCs):
-
F - MECHANICAL ENGINEERING F03 - MACHINES OR ENGINES FOR LIQUIDS F03D - WIND MOTORS
F - MECHANICAL ENGINEERING F04 - POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS F04B - POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS
- DOE Contract Number:
- FG03-81SF11622
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- active; control; speed; windmills; pump; stroke; matched; operating; windmill; drives; hydraulic; changes; wind; driven; shaft; supply; exhaust; valves; opposite; actuator; lengthen; shorten; oscillating; arm; lengthening; shortening; output; diminishing; stall; causes; operate; cylinder; zero; pressure; accumulator; provides; force; fluid; drive; position; response; approaching; exceeding; hydraulic fluid; hydraulic pump; wind driven; speed wind; operating speed; active control; hydraulic actuator; hydraulic cylinder; exhaust valves; speed windmill; driven shaft; /417/60/74/416/
Citation Formats
Avery, Don E. Active control system for high speed windmills. United States: N. p., 1988.
Web.
Avery, Don E. Active control system for high speed windmills. United States.
Avery, Don E. Fri .
"Active control system for high speed windmills". United States. https://www.osti.gov/servlets/purl/866468.
@article{osti_866468,
title = {Active control system for high speed windmills},
author = {Avery, Don E},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}
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