Patents by Inventor Yo-Chan Son

Yo-Chan Son 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).

  • LINEARITY FOR FIELD WEAKENING IN AN INTERIOR PERMANENT MAGNET MACHINE
    Publication number: 20090027000
    Abstract: Systems and methods are disclosed to provide torque linearity in the field-weakening region for an IPM machine. The systems and methods adjust the q-axis and the d-axis components of the stator current commands of the IPM machine using a flux weakening and a torque linearity control loop respectively. Thereby, torque linearity is maintained during the field weakening region of operation of the IPM machine.
    Type: Application
    Filed: July 27, 2007
    Publication date: January 29, 2009
    Inventors: Gabriel Gallegos-Lopez, Yo Chan Son, Milun Perisic, Silva Hiti
  • Position sensorless control algorithm for AC machine
    Patent number: 6894454
    Abstract: A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determine the speed and position of the electric motor, a second motor speed control block in the controller detecting the back electromotive force to determine the speed and position of the electric motor, and a transition control block in said controller to vary operation between the first motor speed control block and the second motor speed control block.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: May 17, 2005
    Assignee: General Motors Corporation
    Inventors: Nitinkumar R. Patel, Steven E. Schulz, James M. Nagashima, Seung Ki Sul, Yo-Chan Son, Bon-Ho Bae
  • Position sensorless control algorithm for AC machine
    Publication number: 20040070362
    Abstract: A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determine the speed and position of the electric motor, a second motor speed control block in the controller detecting the back electromotive force to determine the speed and position of the electric motor, and a transition control block in said controller to vary operation between the first motor speed control block and the second motor speed control block.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 15, 2004
    Inventors: Nitinkumar R. Patel, Steven E. Schulz, James M. Nagashima, Seung Ki Sul, Yo-Chan Son, Bon-Ho Bae