公开(公告)号：US20210222922A1

公开(公告)日：2021-07-22

申请号：US17060705

申请日：2020-10-01

Applicant: LG Electronics Inc.

Inventor： Injae LEE ,  Sangjoon EUM ,  Jeonghwan KIM ,  Mingyu KIM ,  Heedon JUNG

IPC: F25B31/02 ,  H02K1/27 ,  H02K1/26

Abstract: The present disclosure relates to an electric motor, and a compressor having the same. The electric motor includes a stator, and a rotor. The rotor includes a rotation shaft, a rotor core, and a plurality of permanent magnets. The rotor core includes permanent magnet insertion portions each formed therethrough in an axial direction so that the permanent magnet is inserted, and slots each formed through the rotor core in a manner that a core area of a front portion of a d-axis is smaller than a core area of a rear portion of the d-axis in a rotating direction of the rotor when an outer core part of the permanent magnet insertion portion is divided with respect to the d-axis. Accordingly, a decrease in inertia can be suppressed and an occurrence of vibration and noise due to Magnetic Pull Force (MPF) can be prevented.

公开(公告)号：US20180269732A1

公开(公告)日：2018-09-20

申请号：US15612654

申请日：2017-06-02

Applicant: LG ELECTRONICS INC.

Inventor： Wonyong LEE ,  Jeonghwan KIM ,  Soohyun PARK ,  Jihyun AHN ,  Injae LEE

IPC: H02K1/27 ,  H02K21/14

CPC classification number: H02K1/276 ,  H02K2201/06 ,  H02K2213/03

Abstract: An interior permanent magnet type rotor includes: a rotor core having a plurality of slots formed therein, the plurality of slots having a symmetric longitudinal sectional shape; and a plurality of permanent magnets respectively inserted into the plurality of slots, the plurality of permanent magnets having an asymmetric longitudinal sectional shape, wherein each of the plurality of permanent magnets includes: a top surface part; a bottom surface part formed opposite to the top surface part; and first and second side surface parts connecting the top surface part and the bottom surface part, wherein a first vertical part and a second vertical part, which are in contact with side surface parts of the slot, are formed in the first and second side surface parts, respectively.