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Title: 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:
 [1]
  1. (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) OAK
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 = {1988},
month = {1}
}

Patent:

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