Patents by Inventor Rajguru M. Acharya

Rajguru M. Acharya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4280082
    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.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: July 21, 1981
    Assignee: NCR Corporation
    Inventors: Rajguru M. Acharya, James R. Del Signore, II