US 12,074,476 B2
Adhesively-laminated core for stator and electric motor
Kazutoshi Takeda, Tokyo (JP); and Ryu Hirayama, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/293,961
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Dec. 17, 2019, PCT No. PCT/JP2019/049257
§ 371(c)(1), (2) Date May 14, 2021,
PCT Pub. No. WO2020/129921, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-235865 (JP), filed on Dec. 17, 2018.
Prior Publication US 2022/0014053 A1, Jan. 13, 2022
Int. Cl. H02K 1/18 (2006.01); B32B 15/01 (2006.01)
CPC H02K 1/185 (2013.01) [B32B 15/011 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An adhesively-laminated core for a stator comprising:
a plurality of electrical steel sheets laminated on each other and each coated on both sides with an insulation coating; and
an adhesion part disposed in a plurality of dots between each of electrical steel sheets adjacent to each other in a stacking direction and configured to cause the each of electrical steel sheets to be adhered to each other, wherein
a chemical component of the each of electrical steel sheets includes 2.5% to 3.9% by mass of Si,
an average tensile modulus of elasticity of each of adhesion parts is 2500 MPa to 5000 MPa, and
when an average sheet thickness of the each of electrical steel sheets is t1 in units of mm, an average thickness of the each of adhesion parts is t2 in units of μm, and an average value of yield strengths of the each of electrical steel sheets is YP in units of MPa, the following expressions 1, 2, 3, 4, and 5 are all satisfied:
50×t1−12≤t2≤50×t1−6  (expression 1)
0.15≤t1≤0.27  (expression 2)
0.5≤t2≤2.5  (expression 3)
0.025×YP−12≤t2≤0.025×YP−8  (expression 4)
380≤YP≤540  (expression 5).