US PATENT SUBCLASS 388 / 809
.~ Armature control by digital or combined analog and digital 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}
809.~ Armature control by digital or combined analog and digital circuitry {5}
811  DF  .~.~> By pulse width or duty cycle modification
812  DF  .~.~> By phase and frequency modification
813  DF  .~.~> By phase modification
814  DF  .~.~> By frequency modification
815  DF  .~.~> By voltage or current modification

DEFINITION

Classification: 388/809

Armature control by digital or combined analog and digital circuitry:

(under subclass 800) Subject matter in which regulation of the running speed of the motor is effected by digital, or a combination of analog and digital, circuitry which controls the energization of an armature winding only.

(1) Note. See the Glossary in the class definition the terms "digital" and "analog".