US 11,916,437 B2
IPM rotor
Masafumi Okazaki, Tokyo (JP); Natsumi Sugi, Tokyo (JP); Yu Hirotani, Tokyo (JP); Akihiko Mori, Tokyo (JP); and Satoru Akutsu, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/263,962
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 1, 2018, PCT No. PCT/JP2018/040720
§ 371(c)(1), (2) Date Jan. 28, 2021,
PCT Pub. No. WO2020/090086, PCT Pub. Date May 7, 2020.
Prior Publication US 2021/0234419 A1, Jul. 29, 2021
Int. Cl. H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 1/30 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 1/30 (2013.01); H02K 2213/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An IPM rotor, comprising:
a rotor core which includes a plurality of core sheets, and has an accommodation hole; and
a magnet accommodated in the accommodation hole,
wherein the plurality of core sheets include a first core sheet and a second core sheet,
wherein the first core sheet has a first sheet hole forming a part of the accommodation hole,
wherein the second core sheet has a second sheet hole forming a part of the accommodation hole,
wherein the first sheet hole has an edge portion having a flat spring portion which is bent by the magnet through insertion of the magnet into the accommodation hole,
wherein the second sheet hole has an edge portion having a concave portion which allows the flat spring portion bent by the magnet to escape,
wherein a pair of recesses forming a clearance with respect to the magnet are formed at both side portions of the flat spring portion of the edge portion of the first sheet hole, and
wherein a size of the clearance is set based on a relationship between a magnitude of a pressing force of the flat spring portion on the magnet and variation in the pressing force.