US PATENT SUBCLASS 388 / 803
.~ Field control, or field and armature control, by analog (only) circuitry

Current as of: June, 1999
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388 /   HD   ELECTRICITY: MOTOR CONTROL SYSTEMS

800  DF  CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {4}
803.~ Field control, or field and armature control, by analog (only) circuitry {4}
804  DF  .~.~> By pulse width or duty cycle modification
805  DF  .~.~> By phase or frequency modification
806  DF  .~.~> By voltage or current modification {1}
808  DF  .~.~> By selection of windings

DEFINITION

Classification: 388/803

Field control, or field and armature control, by analog (only) circuitry:

(under subclass 800) Subject matter in which regulation of

the running speed of the motor is effected by analog circuitry which controls the energizing of, (1) a field winding of the motor, or (2) both a field winding and an armature winding.

(1) Note. See the Glossary in the class definition for "analog."

SEE OR SEARCH THIS CLASS, SUBCLASS:

816+, for analog closed loop running speed control systems which control an armature winding only.