US PATENT SUBCLASS 388 / 832
.~.~ By frequency modification

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

825  DF  OPEN LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR {3}
830  DF  .~ Analog armature control {7}
832.~.~ By frequency modification

DEFINITION

Classification: 388/832

By frequency modification:

(under subclass 830) Subject matter wherein the control circuit functions by adjusting the frequency of DC power pulses applied to the motor input.