US 12,266,978 B2
Flux concentrate type rotor and motor having the same
Jaeho Kim, Seoul (KR); Younggeun Min, Seoul (KR); Jiwan Lee, Seoul (KR); and Kyungho Ha, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Aug. 11, 2022, as Appl. No. 17/885,859.
Claims priority of application No. 10-2021-0136881 (KR), filed on Oct. 14, 2021.
Prior Publication US 2023/0120874 A1, Apr. 20, 2023
Int. Cl. H02K 1/276 (2022.01); H02K 29/03 (2006.01)
CPC H02K 1/2773 (2013.01) [H02K 29/03 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A flux concentrate type rotor comprising:
a shaft;
a rotor core; and
first and second permanent magnets each provided in an arc shape and having an inner diameter portion and an outer diameter portion,
wherein the rotor core includes:
an annular ring-shaped inner diameter portion core having a shaft through hole to receive the shaft,
a plurality of outer diameter portion cores arranged along a circumferential direction of the inner diameter portion core on an outer circumferential surface of the inner diameter portion core, and the outer diameter portion cores includes first and second outer diameter portion cores that are spaced apart from each other to form a permanent magnet insertion portion for accommodating the first permanent magnet, and
a plurality of bridges arranged along the circumferential direction of the inner diameter portion core to correspond to each of the outer diameter portion cores, and the bridges to connect each of the outer diameter portion cores to the inner diameter portion core, and
wherein the first outer diameter portion core includes a first cutout portion positioned at a lower end of the first outer diameter portion core,
wherein the outer diameter portion cores are formed with an open slot structure,
wherein the flux concentrate type rotor further comprises a gap partitioned by two bridges adjacent to each other in the circumferential direction of the inner diameter portion core, and a part of the first permanent magnet is exposed to the gap,
wherein the first outer diameter portion core includes a first side in contact with the inner diameter portion of the first permanent magnet and a second side in contact with the outer diameter portion of the second permanent magnet, and
wherein the first cutout portion of the first outer diameter portion core extends from an end of the second side of the first outer diameter portion core toward the first side of the first outer diameter portion core, and is connected with the gap.