US PATENT SUBCLASS 318 / 560
POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS)

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

560POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
561  DF  .~> Adaptive or optimizing systems including "bang-bang" servos
562  DF  .~> Time-sharing or multiplexing systems
563  DF  .~> With protective or reliability increasing features (e.g., "fail-safe" systems) {3}
567  DF  .~> Program- or pattern-controlled systems {3}
580  DF  .~> Vehicular guidance systems with single axis control {8}
590  DF  .~> Multiple mode systems {4}
599  DF  .~> Pulse-width modulated power input to motor (e.g., "duty cycle" systems)
600  DF  .~> Digital or numerical systems {3}
606  DF  .~> Frequency- or phase-modulated systems {2}
609  DF  .~> "Reset" systems (P.I.) {1}
611  DF  .~> With stabilizing features (e.g., anti-hunting, damping) {8}
625  DF  .~> Plural servomotors
626  DF  .~> Limit or end-stop control {1}
628  DF  .~> "Feelback" systems
629  DF  .~> Unwanted harmonic or voltage component elimination quadrature rejection systems
630  DF  .~> Antibacklash systems (e.g., with unidirectional approach to balance)
631  DF  .~> Antistatic friction features (e.g., "dither" voltage)
632  DF  .~> With compensating features {2}
635  DF  .~> With signal-, voltage-, or current-limiting
636  DF  .~> "Sampling" systems including miscellaneous "sampled data" control systems
637  DF  .~> Analog computation
638  DF  .~> With particular "error-detecting" means {13}
671  DF  .~> With particular motor control system responsive to the "actuating signal" {10}

DEFINITION

Classification: 318/560

(under the class definition) Subject matter comprising a system which maintains a prescribed relationship between the position of a member or a function of the position and the value of a arbitrarily varied command signal by detecting an error between the actual position of the member or the actual value of the function of the position and the position or value commanded by the signal and controlling a motor of the servo system in response to the detected error.

(1) Note. From the definition set forth above, it is obvious the systems classified hereinunder are feedback control systems in which the directly controlled variable is mechanical position and the terminology employed will generally be that encountered in the feedback control art. Such feedback controlled mechanically positioning systems are also known as servo control or servomechanisms.

(2) Note. Since Class 318 takes, under the class definition only electric motor control systems, then a search, in order to be complete, must in appropriate situations extend to Class 33, Class 77, Class 91, Class 235, Class 244, Class 250, Class 307, Class 310, Class 327, Class 329, Class 330, Class 340, Class 346, Class 361, and Class 409.

(3) Note. If a servo system is presented which only discloses fluid motors and the claims are broad enough to cover either fluid or electric motors, the appropriate fluid motor class accepts the application. If the same type system is presented in which it is disclosed that the motor may be either fluid or electric, Class 318 accepts the application.

SEE OR SEARCH THIS CLASS, SUBCLASS:

690, for self-synchronous motor systems. SEE OR SEARCH CLASS

364, Electrical Computers and Data Processing Systems, appropriate subclass; see the search class note in the class definition of this class (318).

395, Information Processing System Organization,

80+, for robot control.

901, Robots, subcollection 9 for positional servo systems for robots.