Patents by Inventor Debraj Deb

Debraj Deb 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).

  • Closed loop torque compensation for compressor applications
    Patent number: 11499537
    Abstract: Embodiments of the present disclosure include a motor controller with a processor and a machine readable medium. The medium includes instructions that, when loaded and executed by the processor, cause the processor to receive an estimated or sensed speed of a motor, extract a mechanical frequency component from the estimated or sensed speed, transform the mechanical frequency into direct quadrature (DQ) domain at the mechanical frequency, control the mechanical frequency to zero, and generate a dampening signal for torque based upon the controlled mechanical frequency.
    Type: Grant
    Filed: December 17, 2017
    Date of Patent: November 15, 2022
    Assignee: Microchip Technology Incorporated
    Inventors: Prasad Kulkarni, Debraj Deb, Ramesh Kankanala
  • Closed Loop Torque Compensation for Compressor Applications
    Publication number: 20190186480
    Abstract: Embodiments of the present disclosure include a motor controller with a processor and a machine readable medium. The medium includes instructions that, when loaded and executed by the processor, cause the processor to receive an estimated or sensed speed of a motor, extract a mechanical frequency component from the estimated or sensed speed, transform the mechanical frequency into direct quadrature (DQ) domain at the mechanical frequency, control the mechanical frequency to zero, and generate a dampening signal for torque based upon the controlled mechanical frequency.
    Type: Application
    Filed: December 17, 2017
    Publication date: June 20, 2019
    Applicant: Microchip Technology Incorporated
    Inventors: Prasad Kulkarni, Debraj Deb, Ramesh Kankanala
  • Closed loop flux weakening for permanent magnet synchronous motors
    Patent number: 10008967
    Abstract: A closed loop flux weakening method and apparatus are provided. The closed loop flux weakening apparatus may include a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage, a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a d-axis current of a stator of the motor, and a summation circuit that obtains a d-axis reference current by adding the d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: June 26, 2018
    Assignee: Microchip Technology Inc.
    Inventors: Prasad Kulkarni, Ramesh Kankanala, Debraj Deb
  • CLOSED LOOP FLUX WEAKENING FOR PERMANENT MAGNET SYNCHRONOUS MOTORS
    Publication number: 20180115267
    Abstract: A closed loop flux weakening method and apparatus are provided. The closed loop flux weakening apparatus may include a difference circuit that obtains a difference between a q-axis reference voltage and a q-axis voltage, a controller that converts the difference between the q-axis reference voltage and the q-axis voltage into a d-axis current of a stator of the motor, and a summation circuit that obtains a d-axis reference current by adding the d-axis current of the stator of the motor and a feed forward d-axis current of the stator of the motor.
    Type: Application
    Filed: October 25, 2016
    Publication date: April 26, 2018
    Applicant: Microchip Technology Incorporated
    Inventors: Prasad Kulkarni, Ramesh Kankanala, Debraj Deb