US PATENT SUBCLASS 318 / 611
.~ With stabilizing features (e.g., anti-hunting, damping)

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.~ With stabilizing features (e.g., anti-hunting, damping) {8}
612  DF  .~.~> Electric braking near balance (e.g., dynamic) {1}
614  DF  .~.~> Friction-braking near balance including magnetic or eddy current brakes
615  DF  .~.~> By auxiliary feedback loop {1}
619  DF  .~.~> Variable gain bandwidth
620  DF  .~.~> Nonlinear circuits
621  DF  .~.~> Lead or lag networks {1}
623  DF  .~.~> Load stabilization (e.g., viscous, magnetic or friction dampers)
624  DF  .~.~> By deadband at null (e.g., threshold circuits)

DEFINITION

Classification: 318/611

(under subclass 560) Subject matter in which the system includes stabilizing means which prevents hunting and minimizes overshooting of the commanded position.

(1) Note. Hunting is a condition of instability in a feedback control device which is essentially an uncontrolled oscillation due to insufficient feedback, improper phase shift or underdamping. The oscillations cause the positioned element to swing about its commanded position without stopping at the position.

(2) Note. Overshooting is a damped oscillation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

448, for automatic starting or stopping motor controls which include anti-hunt control.