Patents by Inventor Joon Ik UHM

Joon Ik UHM 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 device for detecting initial position of rotor of permanent magnet synchronous motor in no-load environment
    Patent number: 11677342
    Abstract: A method for detecting an initial position of a rotor of a permanent magnet synchronous motor in a no-load environment can comprise the steps of: estimating a temporary initial position ?? by means of aligning a d axis; measuring a first voltage command which is output by performing velocity control within predetermined velocity ranges with respect to the forward direction of a motor on the basis of the temporary initial position ??; measuring a second voltage command which is output by performing velocity control within the predetermined velocity range with respect to the reverse direction of the motor on the basis of the temporary initial position ??; calculating respective variations of the first voltage command and second voltage command, and calculating a compensation angle ??; and calculating an initial position ? of the rotor on the basis of the sum of the temporary initial position ?? and compensation angle ??.
    Type: Grant
    Filed: March 17, 2022
    Date of Patent: June 13, 2023
    Assignee: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION
    Inventors: Geun Ho Lee, Dong Gil Kang, Soon Ho Kwon, Ji Hwan Park, Joon Ik Uhm, Hee Sun Lim, Jung Jun Kim
  • METHOD AND DEVICE FOR DETECTING INITIAL POSITION OF ROTOR OF PERMANENT MAGNET SYNCHRONOUS MOTOR IN NO-LOAD ENVIRONMENT
    Publication number: 20220209691
    Abstract: A method for detecting an initial position of a rotor of a permanent magnet synchronous motor in a no-load environment can comprise the steps of: estimating a temporary initial position ?? by means of aligning a d axis; measuring a first voltage command which is output by performing velocity control within predetermined velocity ranges with respect to the forward direction of a motor on the basis of the temporary initial position ??; measuring a second voltage command which is output by performing velocity control within the predetermined velocity range with respect to the reverse direction of the motor on the basis of the temporary initial position ??; calculating respective variations of the first voltage command and second voltage command, and calculating a compensation angle ??; and calculating an initial position ? of the rotor on the basis of the sum of the temporary initial position ?? and compensation angle ??.
    Type: Application
    Filed: March 17, 2022
    Publication date: June 30, 2022
    Inventors: Geun Ho LEE, Dong Gil KANG, Soon Ho KWON, Ji Hwan PARK, Joon Ik UHM, Hee Sun LIM, Jung Jun KIM