US PATENT SUBCLASS 318 / 592
.~.~ Fine and coarse systems

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

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
590  DF  .~ Multiple mode systems {4}
592.~.~ Fine and coarse systems {3}
593  DF  .~.~.~> Separate fine and coarse motors
594  DF  .~.~.~> Digital systems
595  DF  .~.~.~> Multiple speed synchro systems

DEFINITION

Classification: 318/592

(under subclass 590) Subject matter in which a plurality of position error detectors, one for each operating mode, are provided. The first of these position error detectors provides a coarse signal which is indicative of the rough or approximate final position. When the "coarse" position is approached, the "fine" position error detectors successively take over and precisely direct the servo to it final position. Complete servo control is thus realized at all time.

(1) Note. The servo systems classified herein differ from the "slewing" systems in subclass 597, in that the error signal maintains full control of the servo during the "coarse" positioning mode; whereas in the "slewing" control mode, control by the error signal is lost.