Patents by Inventor Keunwoo Jung

Keunwoo Jung 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).

  • Compressor driving apparatus and chiller including the same
    Patent number: 10677496
    Abstract: The present disclosure relates to a chiller. A compressor driver includes: a compressor including a compressor motor and a magnetic bearing; a coil driver including a switching element and to apply a current to a bearing coil of the magnetic bearing by a switching operation of the switching element to cause a rotor of the compressor motor to be levitated from or land on the magnetic bearing; and a controller to control the switching element of the coil driver, wherein, when the rotor of the compressor motor lands, the controller is configured to gradually decrease the current flowing through the bearing coil. Accordingly, damage to the rotor of the compressor motor can be prevented when the compressor motor is stopped in a magnetic levitation system.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: June 9, 2020
    Assignee: LG ELECTRONICS INC.
    Inventors: Jonghyun Jeon, Joonsik An, Keunwoo Jung
  • COMPRESSOR DRIVING APPARATUS AND CHILLER INCLUDING THE SAME
    Publication number: 20180195772
    Abstract: The present disclosure relates to a chiller. A compressor driver includes: a compressor including a compressor motor and a magnetic bearing; a coil driver including a switching element and to apply a current to a bearing coil of the magnetic bearing by a switching operation of the switching element to cause a rotor of the compressor motor to be levitated from or land on the magnetic bearing; and a controller to control the switching element of the coil driver, wherein, when the rotor of the compressor motor lands, the controller is configured to gradually decrease the current flowing through the bearing coil. Accordingly, damage to the rotor of the compressor motor can be prevented when the compressor motor is stopped in a magnetic levitation system.
    Type: Application
    Filed: January 5, 2018
    Publication date: July 12, 2018
    Inventors: Jonghyun Jeon, Joonsik An, Keunwoo Jung