公开(公告)号：US20180195772A1

公开(公告)日：2018-07-12

申请号：US15863314

申请日：2018-01-05

Applicant: LG ELECTRONICS INC.

Inventor： Jonghyun Jeon ,  Joonsik An ,  Keunwoo Jung

IPC: F25B1/00 ,  H02K7/09 ,  F04D13/02 ,  F24F3/06 ,  F25D17/02

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.

公开(公告)号：US10677496B2

公开(公告)日：2020-06-09

申请号：US15863314

申请日：2018-01-05

Applicant: LG ELECTRONICS INC.

Inventor： Jonghyun Jeon ,  Joonsik An ,  Keunwoo Jung

IPC: F04D29/058 ,  F25B1/00 ,  H02K7/09 ,  F25D17/02 ,  F24F3/06 ,  F04D13/02 ,  F16C32/04

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.