US PATENT SUBCLASS 318 / 616
.~.~.~ Rate feedback

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
611  DF  .~ With stabilizing features (e.g., anti-hunting, damping) {8}
615  DF  .~.~ By auxiliary feedback loop {1}
616.~.~.~ Rate feedback {2}
617  DF  .~.~.~.~> Variable rate feedback
618  DF  .~.~.~.~> Tachometer feedback

DEFINITION

Classification: 318/616

(under subclass 615) Subject matter in which the auxiliary feedback loop senses the rate of positioning and introduces a signal proportional to the rate into the servo loop to reduce the magnitude of the servo error signal as the final position is approached.

(1) Note. For example, the counter E. M. F. of the servo motor can be measured to obtain the rate signal.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

364, for fluid motor control systems which include rate feedback.