US 12,266,971 B2
Adhesively-laminated core for stator, method of manufacturing the same, and electric motor
Kazutoshi Takeda, Tokyo (JP); Hiroyasu Fujii, Tokyo (JP); and Shinsuke Takatani, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/299,226
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Dec. 17, 2019, PCT No. PCT/JP2019/049269
§ 371(c)(1), (2) Date Jun. 2, 2021,
PCT Pub. No. WO2020/129927, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-235870 (JP), filed on Dec. 17, 2018.
Prior Publication US 2022/0037939 A1, Feb. 3, 2022
Int. Cl. H02K 1/16 (2006.01); H02K 15/02 (2006.01)
CPC H02K 1/16 (2013.01) [H02K 15/024 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An adhesively-laminated core for a stator comprising:
a plurality of electrical steel sheets which are stacked to each other and each of which both surfaces coated with an insulation coating; and
an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein
all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered by a plurality of adhesion parts,
an adhesive forming the adhesion part includes a fast-curing type adhesive and a thermosetting adhesive,
the adhesion part is partially provided between the electrical steel sheets adjacent to each other in the stacking direction,
the adhesion part includes a first adhesion part formed with the fast-curing type adhesive and a second adhesion part formed with the thermosetting adhesive,
the adhesion part includes the first adhesion part provided between tooth parts of the electrical steel sheets the second adhesion part provided between core back parts of the electrical steel sheets,
the first adhesion part has an average diameter of 3 mm or more and 7 mm or less in a dot shape, the second adhesion part has an average diameter of 5 mm or more and 10 mm or less in a dot shape, and a proportion of an adhesion area of the first adhesion part is 5% or more and less than 50% and a proportion of an adhesion area of the second adhesion part is 50% or more and 95% or less with respect to a total adhesion area by the adhesion part between the electrical steel sheets,
an adhesion area ratio QB0 of the adhesion part to the tooth part is 10% or more and 70% or less and an adhesion area ratio QA0 of the adhesion part to the core back part is 40% or more and 90% or less between the electrical steel sheets,
an adhesion area ratio QA1 of the first adhesion part to the core back part is 4% or more and 30% or less,
an adhesion area ratio QA2 of the second adhesion part to the core back part is 15% or more and 90% or less,
an adhesion area ratio QB1 of the first adhesion part to the tooth part is 5% or more and 30% or less, and
an adhesion area ratio QB2 of the second adhesion part to the tooth part is 0% or more and 65% or less.