Active control system for high speed windmills

Patent · 01 January 1988

OSTI ID:866468

Avery, Don E ^[1]

---

1. 45-437 Akimala St., Honolulu, HI 96744

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.

• Research Organization: Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)
• DOE Contract Number: FG03-81SF11622
• Assignee: Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)
• Patent Number(s): US 4718825
• OSTI ID: 866468
• Country of Publication: United States
• Language: English

Related Subjects

/417/60/74/416/
accumulator
active
active control
actuator
approaching
arm
causes
changes
control
cylinder
diminishing
drive
driven
driven shaft
drives
exceeding
exhaust
exhaust valves
fluid
force
hydraulic
hydraulic actuator
hydraulic cylinder
hydraulic fluid
hydraulic pump
lengthen
lengthening
matched
operate
operating
operating speed
opposite
oscillating
output
position
pressure
provides
pump
response
shaft
shorten
shortening
speed
speed wind
speed windmill
stall
stroke
supply
valves
wind
wind driven
windmill
windmills
zero