Motors: expansible chamber type – Working member position feedback to motive fluid control – Bias-type input and feedback signal means
Patent
1987-08-31
1989-01-03
Michalsky, Gerald A.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Bias-type input and feedback signal means
91459, 91467, 13762523, 13762565, F15B 13044
Patent
active
047948450
ABSTRACT:
A direct drive servo valve includes a housing and a series of conduits connecting the housing to a fluid pressure source and to an associated actuator, a sleeve in the housing having a plurality of passageways interconnecting the conduits and a spool valve member rotatable within the sleeve to connect the conduits as desired, the spool valve being rotated by a torque motor. The torque motor rotor is connected to the return side of the fluid pressure source. The sleeve is formed of a series of disks which have a desired pattern of holes therethrough and which are bonded together to create a manifold structure having the desired pattern of passageways. A rotary variable differential transformer is connected to the spool and provides feedback signals to an external circuit controlling the torque motor. A torque rod is connected to the spool and the housing to provide a preload which tends to center or "null out" the spool position when there is no input signal. A feedback lever movable with the actuator output operates through a helical nut and screw assembly to move the torque rod in such manner as to move the torque motor rotor and the spool toward null.
REFERENCES:
patent: 4308892 (1982-01-01), Van Ausdal
Electrodynamics Division Drawing 3335097.
Allied-Signal Inc.
Michalsky Gerald A.
Smith Robert C.
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