US PATENT SUBCLASS 388 / 804
.~.~ 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}
803  DF  .~ Field control, or field and armature control, by analog (only) circuitry {4}
804.~.~ By pulse width or duty cycle modification

DEFINITION

Classification: 388/804

By pulse width or duty cycle modification:

(under subclass 803) 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.