US PATENT SUBCLASS 388 / 814
.~.~ By frequency modification

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  DF  .~ Armature control by digital or combined analog and digital circuitry {5}
814.~.~ By frequency modification

DEFINITION

Classification: 388/814

By frequency modification:

(under subclass 809) Subject matter wherein the control circuit functions by determining the frequency relationship between a reference signal and a feedback signal and by applying an adjustment, based on this relationship, to the motor input.