Lg Electronics Inc.

Korea Advanced Institute of Science and Technology

Wookjin Lee

Hoonbong Lee

Yanghwan Kim

Junho Ahn

Chaseung Jun

Sunku Kwon

Jaehoon Jeong

Seungwook Kim

Bongmun Jang

Daegeun Seo

Sehwa Choe

Jongmin Kim

Tae-Ho Song

Dalho Cheong

Jinseong Hwang

Bongsu Choi

In-Seok Yeo

Shin-Woo Jang

Munseok Seo

Jae Hyug Lee

Seong Wook Cho

Hae-yong Jung

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.

Device for driving a plurality of motors and electric apparatus including the same

A device for driving a plurality of motors and an electric apparatus having the same is disclosed. The device includes an inverter connected to a DC terminal, a multi-phase motor connected to the inverter, a single-phase motor serially connected to the multi-phase motor, and a first capacitor and a second capacitor connected in series between a first end and a second end of the DC terminal, wherein the single-phase motor is connected to the multi-phase motor, and a node between the first capacitor and the second capacitor. Accordingly, a plurality of motors serially connected with each other can be driven by using a single inverter.

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.

Provided is an inner structure of a vacuum insulator with an assembly reciprocating support to increase an insulation performance, the structure of the vacuum insulator including a top board, a bottom board, and an assembly reciprocating support installed perpendicularly between the top board and the bottom board, the assembly reciprocating support including a solid shaft, a hollow shaft, and a connection part.

Structure of vacuum insulator with assembly reciprocating support

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Seoul, South Korea

Wookjin Lee