公开(公告)号：US20210044225A1

公开(公告)日：2021-02-11

申请号：US16988329

申请日：2020-08-07

Applicant: LG Electronics Inc.

Inventor： Sunku KWON ,  Chaseung JUN ,  Sehwa CHOE ,  Wookjin LEE

IPC: H02P5/50 ,  H02P21/22

Abstract: A device for driving a plurality of motors, including an inverter connected to a DC terminal; a multi-phase motor connected to the inverter; and a single-phase motor serially connected to the multi-phase motor, wherein a number of frequency of current input to the multi-phase motor when driving the single-phase motor and the multi-phase motor at the same speed is smaller than the number of frequency of current input to the multi-phase motor when driving the single-phase motor and the multi-phase motor at different speeds. Accordingly, a plurality of motors can be simultaneously driven at different speeds, by using a single inverter.

公开(公告)号：US20220271690A1

公开(公告)日：2022-08-25

申请号：US17744303

申请日：2022-05-13

Applicant: LG Electronics Inc.

Inventor： Sunku KWON ,  Chaseung JUN ,  Sehwa CHOE ,  Wookjin LEE

IPC: H02P5/50 ,  H02P21/22

Abstract: A device for driving a plurality of motors, including an inverter connected to a DC terminal; a multi-phase motor connected to the inverter; and a single-phase motor serially connected to the multi-phase motor, wherein a number of frequency of current input to the multi-phase motor when driving the single-phase motor and the multi-phase motor at the same speed is smaller than the number of frequency of current input to the multi-phase motor when driving the single-phase motor and the multi-phase motor at different speeds. Accordingly, a plurality of motors can be simultaneously driven at different speeds, by using a single inverter.

公开(公告)号：US20210135606A1

公开(公告)日：2021-05-06

申请号：US17087789

申请日：2020-11-03

Applicant: LG ELECTRONICS INC.

Inventor： Sunku KWON ,  Chaseung JUN ,  Jaehoon JEONG ,  Sehwa CHOE

IPC: H02P5/505

Abstract: A device for driving a plurality of motors and an electric apparatus includes a first and a second capacitor, an inverter connected to a DC terminal, a multi-phase motor connected to the inverter, a single-phase motor serially connected with the multi-phase motor, and a controller configured to control the inverter. For starting the single phase motor during operation of the multi-phase motor, the controller is configured to perform, during an alignment period, an alignment of a rotor of the single-phase motor and perform, during a voltage compensation period, a voltage compensation for compensating a voltage change of a DC terminal neutral point between the first capacitor and the second capacitor based on the alignment of the rotor of the single-phase motor.

公开(公告)号：US20220361726A1

公开(公告)日：2022-11-17

申请号：US17627917

申请日：2020-06-18

Applicant: LG ELECTRONICS INC.

Inventor： Sunku KWON ,  Sehwa CHOE ,  Donghyun LIM ,  Chaseung JUN

IPC: A47L9/28 ,  A47L5/30 ,  A47L5/36 ,  A47L9/04

Abstract: The present disclosure provides a control method capable of, by using a current value of a nozzle, determining whether a nozzle is separated from a vacuum cleaner and whether the nozzle is reconnected to the vacuum cleaner after separation. To this end, a vacuum cleaner may comprise a nozzle connectable to a suction unit for suctioning dusts. The nozzle may comprise a rotary cleaning unit for applying pressure to a cleaning target surface so as to separate a foreign substance therefrom, and a nozzle motor for driving the rotary cleaning unit. In order to drive the nozzle, a voltage having been controlled by a pulse width modulation (PWM) method is applied, and a measurement unit included in the vacuum cleaner may measure a current value of the nozzle, the current value depending on the applied voltage.

公开(公告)号：US20220273150A1

公开(公告)日：2022-09-01

申请号：US17627968

申请日：2020-06-18

Applicant: LG ELECTRONICS INC.

Inventor： Sunku KWON ,  Sehwa CHOE ,  Donghyun LIM ,  Chaseung JUN

IPC: A47L9/28 ,  A47L5/28 ,  A47L5/36 ,  A47L5/24 ,  A47L5/22 ,  A47L9/06

Abstract: The present disclosure provides a control method for automatically detecting what kind of nozzle is a nozzle mounted on a cleaner by using different starting current profiles. The cleaner may include a suction unit for suctioning dust, and various nozzles which are detachable from the suction unit. The nozzle may include a rotation cleaning unit which is accommodated in the nozzle to clean a surface to be cleaned, and a nozzle driving unit for driving the rotation cleaning unit. The nozzle may exhibit different starting current profiles depending on the number of rotations or reduction ratio of the nozzle driving unit, or whether an auxiliary control unit is included.