US 11,791,672 B2
Core, stator, and rotating electric machine
Tatsuya Saito, Osaka (JP); Tomoyuki Ueno, Osaka (JP); Yuka Fukunaga, Osaka (JP); Hijiri Tsuruta, Takahashi (JP); and Shinichi Hirono, Takahashi (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and Sumitomo Electric Sintered Alloy, Ltd., Takahashi (JP)
Appl. No. 17/414,871
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and Sumitomo Electric Sintered Alloy, Ltd., Takahashi (JP)
PCT Filed Dec. 13, 2019, PCT No. PCT/JP2019/049064
§ 371(c)(1), (2) Date Jun. 16, 2021,
PCT Pub. No. WO2020/129866, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 2018-236767 (JP), filed on Dec. 18, 2018.
Prior Publication US 2022/0060066 A1, Feb. 24, 2022
Int. Cl. H02K 1/14 (2006.01)
CPC H02K 1/148 (2013.01) [H02K 2213/03 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A core for use in an axial gap rotating electric machine, the core comprising:
a yoke having an annular plate shape; and
a plurality of teeth having a columnar shape arranged at intervals in a circumferential direction of the yoke,
wherein the yoke has:
an outer-circumferential face;
an inner-circumferential face;
a first face having a flat shape connecting the outer-circumferential face and the inner-circumferential face to each other; and
a plurality of recessed portions connected to the first face,
each of the plurality of teeth has an outer-circumferential face protruding in an axial direction of the yoke with respect to the first face,
each of the plurality of recessed portions are connected to at least a portion of each one of the plurality of teeth in a circumferential direction of the outer-circumferential face,
all shortest distances between at least one of an outer-circumferential edge of the first face and an inner-circumferential edge of the first face and the outer-circumferential faces of the plurality of teeth are 4 mm or less, and
the yoke and the plurality of teeth are made of an integrally-molded powder compact.