US PATENT SUBCLASS 388 / 805
.~.~ By phase or 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}
803  DF  .~ Field control, or field and armature control, by analog (only) circuitry {4}
805.~.~ By phase or frequency modification

DEFINITION

Classification: 388/805

By phase or frequency modification:

(under subclass 803) Subject matter wherein the control circuit functions by determining the phase or frequency relationship between a reference signal and a feedback signal and by applying an adjustment, based on this relationship, to the motor input.