US 11,923,130 B2
Laminated core and electric motor
Masahito Kamikawabata, Tokyo (JP); Ryu Hirayama, Tokyo (JP); and Kazutoshi Takeda, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/312,103
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Dec. 17, 2019, PCT No. PCT/JP2019/049292
§ 371(c)(1), (2) Date Jun. 9, 2021,
PCT Pub. No. WO2020/129940, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-235859 (JP), filed on Dec. 17, 2018.
Prior Publication US 2022/0028608 A1, Jan. 27, 2022
Int. Cl. H02K 1/18 (2006.01); H01F 27/245 (2006.01); H01F 41/02 (2006.01); H02K 1/27 (2022.01)
CPC H01F 41/0233 (2013.01) [H01F 27/245 (2013.01); H02K 1/18 (2013.01); H02K 1/27 (2013.01); H02K 2201/09 (2013.01); H02K 2213/03 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A laminated core comprising:
a plurality of electrical steel sheets stacked in a thickness direction,
wherein the electrical steel sheet includes an annular core back part and a plurality of tooth parts protruding from the core back part toward a radial direction and arranged at intervals in a circumferential direction of the core back part,
wherein among the plurality of electrical steel sheets, the tooth parts of the electrical steel sheets located at one side on the outside in a stacking direction are adhered to each other by an adhesion part provided between surfaces where the tooth parts adjacent to each other in the stacking direction face each other, the tooth parts of the electrical steel sheets located at the other side on the outside in the stacking direction are adhered to each other by an adhesion part provided between surfaces where the tooth parts adjacent to each other in the stacking direction face each other, and the tooth parts of the electrical steel sheets located at a center part in the stacking direction are not adhered to each other,
wherein the number of the electrical steel sheets located at the center part in the stacking direction is larger than the number of the electrical steel sheets located at one side on the outside in the stacking direction and the number of the electrical steel sheets located at the other side on the outside in the stacking direction, and
wherein a ratio of the number of the electrical steel sheets located at one side on the outside in the stacking direction with respect to the total number of the plurality of electrical steel sheets of the laminated core and a ratio of the number of the electrical steel sheets located at the other side on the outside in the stacking direction with respect to the total number of the plurality of electrical steel sheets of the laminated core are 1% or more and 10% or less.