US PATENT SUBCLASS 388 / 811
.~.~ By pulse width or duty cycle 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}
811.~.~ By pulse width or duty cycle modification

DEFINITION

Classification: 388/811

By pulse width or duty cycle modification:

(under subclass 809) Subject matter wherein energy is applied to the motor in the form of a series of pulses and the running speed of the motor is controlled by varying the width of the pulses or by periodic interruption of the pulses.