Patents by Inventor Mohammed S. Arefeen

Mohammed S. Arefeen 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).

  • Method and Apparatus for Riding through Power Disruptions of a Drive Circuit
    Publication number: 20230361711
    Abstract: An electrical ride-through (ERT) unit is configured to apply a voltage to a drive circuit during disruptions of line voltage to the drive circuit. The ERT unit includes a capacitor on an ERT circuit that is prevented from applying the voltage to the drive circuit during normal operation of the drive circuit and applies the voltage to the drive circuit during a voltage drop on the drive circuit.
    Type: Application
    Filed: July 17, 2023
    Publication date: November 9, 2023
    Inventor: Mohammed S. Arefeen
  • Method and apparatus for riding through power disruptions of a drive circuit
    Patent number: 11799410
    Abstract: An electrical ride-through (ERT) unit is configured to apply a voltage to a drive circuit during disruptions of line voltage to the drive circuit. The ERT unit includes a capacitor on an ERT circuit that is prevented from applying the voltage to the drive circuit during normal operation of the drive circuit, and applies the voltage to the drive circuit during a voltage drop on the drive circuit.
    Type: Grant
    Filed: July 20, 2022
    Date of Patent: October 24, 2023
    Assignee: WEATHERFORD TECHNOLOGY HOLDINGS, LLC
    Inventor: Mohammed S. Arefeen
  • METHOD AND APPARATUS FOR RIDING THROUGH POWER DISRUPTIONS OF A DRIVE CIRCUIT
    Publication number: 20220360204
    Abstract: An electrical ride-through (ERT) unit is configured to apply a voltage to a drive circuit during disruptions of line voltage to the drive circuit. The ERT unit includes a capacitor on an ERT circuit that is prevented from applying the voltage to the drive circuit during normal operation of the drive circuit, and applies the voltage to the drive circuit during a voltage drop on the drive circuit.
    Type: Application
    Filed: July 20, 2022
    Publication date: November 10, 2022
    Inventor: Mohammed S. Arefeen
  • Method and apparatus for riding through power disruptions of a drive circuit
    Patent number: 11424709
    Abstract: An electrical ride-through (ERT) unit is configured to apply a voltage to a drive circuit during disruptions of line voltage to the drive circuit. The ERT unit includes a capacitor on an ERT circuit that is prevented from applying the voltage to the drive circuit during normal operation of the drive circuit, and applies the voltage to the drive circuit during a voltage drop on the drive circuit.
    Type: Grant
    Filed: November 5, 2020
    Date of Patent: August 23, 2022
    Assignee: Raptor Lift Solutions, LLC
    Inventor: Mohammed S. Arefeen
  • METHOD AND APPARATUS FOR RIDING THROUGH POWER DISRUPTIONS OF A DRIVE CIRCUIT
    Publication number: 20220140764
    Abstract: An electrical ride-through (ERT) unit is configured to apply a voltage to a drive circuit during disruptions of line voltage to the drive circuit. The ERT unit includes a capacitor on an ERT circuit that is prevented from applying the voltage to the drive circuit during normal operation of the drive circuit, and applies the voltage to the drive circuit during a voltage drop on the drive circuit.
    Type: Application
    Filed: November 5, 2020
    Publication date: May 5, 2022
    Inventor: Mohammed S. Arefeen
  • Method of stall detection for stepper motor system
    Patent number: 7224140
    Abstract: This invention detects a stall in a stepper motor by determining a motor winding current for each stepper pulse and determining if the winding current of a particular stepper pulse meets predetermined criteria. The motor winding current may be determined by measuring a voltage across an ON field effect transistor during a stepper pulse and calculating a winding current using an assumed ON field effect transistor resistance. The predetermined criteria may by a calculated motor winding current greater than a predetermined threshold, greater than prior pulse by more than a predetermined threshold or greater than a prior pulse by more than a predetermined factor.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: May 29, 2007
    Assignee: Texas Instruments Incorporated
    Inventors: Mohammed S. Arefeen, Jim D. Childers
  • Indirect rotor position sensor for a sinusoidal synchronous reluctance machine
    Patent number: 5448149
    Abstract: A discrete position sensor elimination technique for a sinusoidally wound synchronous reluctance motor drive uses induced voltage, phase currents, and excitation frequency to estimate rotor position at all speeds, including zero speed.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: September 5, 1995
    Assignee: Texas A&M University
    Inventors: Mehrdad Ehsani, Mohammed S. Arefeen, Thomas A. Lipo