US 12,237,718 B2
Core, stator, and rotating electric device
Tatsuya Saito, Osaka (JP); Tomoyuki Ueno, Osaka (JP); Hijiri Tsuruta, Takahashi (JP); Yuichi Nakamura, Osaka (JP); and Yuka Fukunaga, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC SINTERED ALLOY, LTD., Takahashi (JP)
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP); and Sumitomo Electric Sintered Alloy, Ltd., Takahashi (JP)
Filed on Apr. 18, 2024, as Appl. No. 18/638,699.
Application 18/638,699 is a continuation of application No. 17/285,476, granted, now 11,996,731, previously published as PCT/JP2019/035080, filed on Sep. 5, 2019.
Claims priority of application No. 2018-202373 (JP), filed on Oct. 26, 2018.
Prior Publication US 2024/0266890 A1, Aug. 8, 2024
Int. Cl. H02K 1/14 (2006.01); H02K 1/02 (2006.01); H02K 3/22 (2006.01); H02K 3/52 (2006.01); H02K 21/24 (2006.01)
CPC H02K 1/146 (2013.01) [H02K 1/02 (2013.01); H02K 3/22 (2013.01); H02K 21/24 (2013.01); H02K 1/14 (2013.01); H02K 3/522 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A core used in an axial-gap rotating electric device, the core comprising:
a back yoke; and
a tooth protruding in an axial direction that is perpendicular to a first flat surface of the back yoke,
wherein the back yoke and the tooth is constituted of an integrally-molded powder compact,
wherein a first curved section that connects a peripheral surface of the tooth and the first flat surface of the back yoke is provided at a corner between the tooth and the back yoke
wherein the back yoke has a second flat surface opposite to the first flat surface, and
wherein a distance between the first curved section and the second flat surface increases from the first flat surface toward the peripheral surface of the tooth.