Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1989-02-13
1989-10-03
Chambers, A. Michael
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
91454, 91459, 13761419, 25112905, F15B 1316
Patent
active
048708925
ABSTRACT:
A control system for a two way acting hydraulic servomotor wherein the servomotor is connected in the diagonal of a bridge circuit that includes four magnetic valves with a pair of the valves being normally open in a non-energized condition being connected to the one end of the servomotor and to the container and a second pair of the valves being normally closed in a deenergized condition being connected to the opposite end of the servomotor and to a pressure source. Circuitry provides pulse trains that are modulatable to control the operation of the magnetic valves and thereby the application of pressurized fluid to the opposite ends of the servomotor.
REFERENCES:
patent: 3608435 (1971-09-01), Conabee et al.
patent: 3782250 (1974-01-01), Kiszewski
patent: 4318332 (1982-03-01), Shingu et al.
patent: 4440066 (1984-04-01), Anderson
patent: 4628499 (1986-12-01), Hammett
Dixen Carl C.
Nissen Harry S.
Ravn Kjeld
Thomsen Flemming
Chambers A. Michael
Danfoss A/S
Easton Wayne B.
Johnson Clayton R.
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