US 11,894,720 B2
Core, stator and rotating electrical machine
Tatsuya Saito, Osaka (JP); Yuichi Nakamura, Osaka (JP); and Tomoyuki Ueno, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/286,943
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Dec. 11, 2019, PCT No. PCT/JP2019/048487
§ 371(c)(1), (2) Date Apr. 20, 2021,
PCT Pub. No. WO2020/137549, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-246317 (JP), filed on Dec. 27, 2018.
Prior Publication US 2021/0384778 A1, Dec. 9, 2021
Int. Cl. H02K 1/14 (2006.01); H02K 1/02 (2006.01); H02K 21/24 (2006.01)
CPC H02K 1/146 (2013.01) [H02K 1/02 (2013.01); H02K 21/24 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A core used in an axial gap type rotating electrical machine, comprising:
an annular yoke having a plurality of through-holes disposed in a circumferential direction; and
a plurality of columnar teeth disposed in the circumferential direction of the yoke, each of the plurality of columnar teeth including one end inserted into each of the plurality of through-holes,
wherein the yoke and each of the teeth are composed of a powder compact separate from each other,
wherein the one end of each of the teeth is off-center in the through-hole, and
wherein each of the teeth includes a proximal region with a gap of 0.05 mm or less between an outer peripheral face at one end and an inner peripheral face of the through-hole.