US 12,191,709 B2
Electric rotating machine with stator having core back portions with welding portions
Tomoyuki Kinoshita, Tokyo (JP); Tatsuro Hino, Tokyo (JP); Kouta Katsuragi, Tokyo (JP); Satoshi Ekino, Tokyo (JP); Kazuya Hasegawa, Tokyo (JP); Norihiro Murata, Tokyo (JP); and Akihito Mori, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/613,169
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Oct. 2, 2019, PCT No. PCT/JP2019/038844
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2021/064883, PCT Pub. Date Apr. 8, 2021.
Prior Publication US 2022/0209593 A1, Jun. 30, 2022
Int. Cl. H02K 1/18 (2006.01); H02K 1/14 (2006.01)
CPC H02K 1/185 (2013.01) [H02K 1/148 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electric rotating machine with stator having-core back portions with welding portions comprising:
a housing;
a stator iron core that includes two or more stacked electromagnetic steel plates and has a core-back portion and tooth portions each extending from the core-back portion toward a radially inside thereof; and
a rotor that is disposed at the radially inside of the stator iron core and is pivotably supported by a stator having the stator iron core,
wherein the stator iron core is fixed to the housing through shrink-fitting or press-fitting,
wherein the core-back portion has a welding portion that extends from a stacking-direction end portion along the stacking direction so as to ride on the two or more electromagnetic steel plates,
wherein the welding portion is provided partly between the both stacking-direction end portions of the core-back portion,
wherein the welding portion includes:
a first welding portion formed from one end portion of the core-back portion in the stacking-direction to partway toward the center in the stacking-direction, and
a second welding portion formed from other end portion of the core-back portion in the stacking-direction to partway toward the center in the stacking-direction,
wherein the first welding portion being formed such that the welding width gradually decreases as it approaches the center in the stacking-direction from the one end portion, and
wherein the second welding portion being formed such that the welding width gradually decreases as it approaches the center in the stacking-direction from the other end portion.