DIRECT CURRENT MOTOR SPEED CONTROL APPARATUS

摘要

A DC motor control system reduces power demands imposed upon a DC power source (10) energizing a utilizing device (74) by varying the time during which power application occurs, but not the magnitude of the power which remains constant. The DC motor control system includes a transducer/resistor network (186), a trigger pulse circuit (180), a control signal circuit (182), a driver circuit (28), and a switch network (30). The control signal circuit (182) outputs a duty cycle control signal as regulated by the transducer/resistor network (186) and the trigger pulse circuit (180). The transducer/resistor network (186) permits an operator to determine the duration of the duty cycle control signal, which varies from 0 % to 100 %, while the trigger pulse circuit (180) establishes the frequency of the duty cycle control signal. The driver circuit (28) receives and amplifies each duty cycle control signal outputted by the control signal circuit (182). The driver circuit (28) inputs each amplified duty cycle control signal into the switch network (30) to activate it. The activation of the switch network (30) completes a current path from the DC power source (10) to the utilizing device (74) so that the DC power source (10) energizes the utilizing device (74) for the duration of each duty cycle control signal.