公开(公告)号：US20210372472A1

公开(公告)日：2021-12-02

申请号：US16959753

申请日：2019-01-04

Applicant: LG ELECTRONICS INC.

Inventor： Kyung Min KIM ,  Joonsik AN

IPC: F16C32/04

Abstract: Magnetic bearing control device and control method are disclosed. A magnetic bearing control device according to an embodiment of the present invention comprises: a bearing control unit for outputting a plurality of switch control signals on the basis of gap information of a bearing coil and a rotor and current information applied to the bearing coil; and a coil driving unit for turning a plurality of self-formed switching elements on/off in accordance with the plurality of switch control signals and controlling the amount of current applied to the bearing coil and thus adjusting the magnetic field strength between the bearing coil and the rotor. The bearing control unit generates and outputs the plurality of switch control signals such that bootstrap capacitor charging time of the coil driving unit may be secured. Therefore, a magnetic bearing control circuit structure may be simplified by means of an additional bootstrap capacitor structure.

公开(公告)号：US20190120290A1

公开(公告)日：2019-04-25

申请号：US16169311

申请日：2018-10-24

Applicant: LG Electronics Inc.

Inventor： Keun Woo JUNG ,  Kyung Min KIM ,  Jonghyun JEON ,  Joonsik AN

IPC: F16C32/04 ,  H02K7/09 ,  H02P6/28 ,  H02P6/17 ,  H02P6/12

Abstract: A magnetic bearing control apparatus includes a plurality of output elements configured to generate electromagnetic force, a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements, at least one displacement sensor configured to sense a displacement of the rotation shaft, and a controller. The controller is configured to control a current supplied to the plurality of output elements, to control a position of the rotation shaft based on the current supplied to the plurality of output elements according to the displacement of the rotation shaft, and to determine a failure of the displacement sensor.

公开(公告)号：US20190089156A1

公开(公告)日：2019-03-21

申请号：US16132710

申请日：2018-09-17

Applicant: LG Electronics Inc.

Inventor： Kyung Min KIM ,  Joonsik AN

IPC: H02J3/02 ,  H02M1/10 ,  F24F11/88

Abstract: A power source input device for both AC/DC power sources includes a first power source input unit that is provided at a power source input terminal of an electric power device to convert an AC or DC commercial power source selectively input from the outside into a DC driving power source and supply the converted DC driving power source to an accessory device. A second power source input unit is provided in the accessory device to supply the DC driving power source supplied from the first power source input unit to at least one load, thereby simplifying a configuration of a power source input terminal of each of the electric power devices and reducing a manufacturing cost thereof.