公开(公告)号：US10811919B2

公开(公告)日：2020-10-20

申请号：US15547174

申请日：2016-01-28

Applicant: LG ELECTRONICS INC.

Inventor： Changhum Jo ,  Kyunghoon Lee ,  Kwangyong Jang ,  Jongwon Kim

IPC: H02K1/27 ,  A47L9/22 ,  H02K1/28

Abstract: A brushless direct current (BLDC) motor is disclosed. The BLDC motor includes a shaft made of a nonmagnetic material, a plurality of magnets surrounding the outer circumference of the shaft, a stator surrounding the outer circumferences of the magnets, wherein each of the magnets has an arc-shaped outer circumferential surface, an arc-shaped inner circumferential surface facing the shaft, and opposite side surfaces facing other adjacent magnets, and the magnets include a first magnet magnetized in a direction directed from the outer circumferential surface to the inner circumferential surface, a second magnet magnetized in a direction directed from the inner circumferential surface to the outer circumferential surface, and a third magnet magnetized in a direction directed from one side surface to the other side surface. The efficiency of the motor is improved while eddy current loss is minimized.

公开(公告)号：US11011955B2

公开(公告)日：2021-05-18

申请号：US15933654

申请日：2018-03-23

Applicant: LG ELECTRONICS INC.

Inventor： Jongsu Kim ,  Taehee Kwak ,  Jungwook Moon ,  Changhum Jo

IPC: H02K5/20 ,  H02K9/19 ,  H02K11/25 ,  H02K11/30 ,  H02K11/33

Abstract: Disclosed herein is a motor including a shaft, a rotor, a motor housing forming an inner space to receive the shaft and the rotor therein, a stator received in the motor housing and disposed outside the rotor based on a radial direction of the shaft, a first flow path disposed outside the stator based on the radial direction of the shaft such that a first fluid flows in the first flow path, the first fluid being discharged to the inner space and cooling the stator and the rotor, and a second flow path disposed between the first flow path and the stator based on the radial direction of the shaft such that a second fluid flows in the second flow path, the second fluid absorbing heat of the stator transferred through a flow path wall.

公开(公告)号：US10186915B2

公开(公告)日：2019-01-22

申请号：US15004152

申请日：2016-01-22

Applicant: LG ELECTRONICS INC.

Inventor： Kwangyong Jang ,  Sangchul Lee ,  Kyunghoon Lee ,  Changhum Jo

IPC: H02K1/14 ,  H02K21/14 ,  H02K1/27 ,  H02K19/10 ,  H02K21/16 ,  H02K9/06 ,  H02K7/14

Abstract: A Blushless Direct Current (BLDC) motor may include a motor housing; a stator including a stator core installed within the motor housing and a coil wound in the stator core and that generates a magnetic field by applied power; and a rotor disposed within the stator and in which a magnet that interacts with the magnetic field is installed and that rotates within the stator by an interaction with the magnetic field. The stator core may include a back yoke in which straight portions and curved portions are alternately formed; and teeth protruded from the back yoke toward the magnet. The tooth include a neck protruded from the back yoke, and a shoe protruded from the neck and separated from the magnet and that encloses at least a portion of the magnet. A ratio A/B of a width A of the neck to a width B of a shoe end portion is 2.5 to 3.5. By optimizing a ratio A/B of a width A of the neck to a width B of the shoe end portion constituting the stator core, efficiency of a BLDC motor may be maximized.