Ncr Corporation

Rajguru M Acharya

James R Del Signore, Ii

A speed control circuit for a motor is responsive to variations in motor supply voltage and torque wherein a digital output indication of the actual speed of the motor is generated. The digital output is converted to an analog value and applied to a comparator which also receives the output voltage of a ramp circuit based on the motor supply voltage. The output of the comparator controls the width of the motor voltage pulses applied from a power amplifier to the motor in which the voltage pulses applied have proportionally larger width for a smaller level of motor supply voltages or decrease in the amount of motor shaft speed and proportionally narrow width pulses for increased levels of motor supply voltage or an increase in the amount of motor shaft speed. A one-shot network is provided for motor stall protection.

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Neptune Township, NJ, United States of America

Rajguru M Acharya