The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 1981
Filed:
Apr. 23, 1979
Rajguru M Acharya, Neptune Township, Monmouth County, NJ (US);
James R Del Signore, II, Ithaca, NY (US);
NCR Corporation, Dayton, OH (US);
Abstract
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.