US 7,521,833 B2
Permanent magnet embedment rotating electric machine, motor for car air conditioner, and enclosed electric compressor
Taku Adaniya, Kariya (Japan); Ai Saeki, Kariya (Japan); Kiyoshi Uetsuji, Kariya (Japan); Hiroshi Fukasaku, Kariya (Japan); Minoru Mera, Kariya (Japan); and Masatoshi Kobayashi, Kariya (Japan)
Assigned to Kabushiki Kaisha Toyota Jidoshokki, Kariya-Shi (Japan)
Filed on Apr. 13, 2006, as Appl. No. 11/403,692.
Claims priority of application No. 2005-117463 (JP), filed on Apr. 14, 2005; application No. 2006-035777 (JP), filed on Feb. 13, 2006; and application No. 2006-054093 (JP), filed on Feb. 28, 2006.
Prior Publication US 2006/0250041 A1, Nov. 09, 2006
Int. Cl. H02K 21/12 (2006.01)
U.S. Cl. 310—156.53 23 Claims
OG exemplary drawing
 
1. A rotating electric machine comprising:
an annular stator including an inner circumference, a plurality of teeth arranged along the inner circumference of the stator, and a slot defined between adjacent ones of the teeth;
a coil arranged in the slot;
a rotor surrounded by the stator, with the rotor having a rotational axis and an outer circumference extending about the rotational axis in a circumferential direction; and
a plurality of permanent magnets embedded in the rotor, with each permanent magnet having a magnetic pole center;
a plurality of circumferential portions respectively corresponding to the magnetic pole centers and defined along the outer circumference of the rotor at a plurality of locations, with each circumferential portion extending along part of a virtual circumferential surface, which is coaxial with the rotor, and spaced from one another in the circumferential direction; and
a plurality of convex portions connecting adjacent pairs of the circumferential portions, wherein each of the convex portions is located radially inward from the virtual circumferential surface, projects in a radially outward direction, and includes a plurality of angled portions directed in the radially outward direction.