US 11,811,265 B2
Motor, fan, air conditioner, and manufacturing method of motor
Hiroki Aso, Tokyo (JP); Takaya Shimokawa, Tokyo (JP); Ryogo Takahashi, Tokyo (JP); and Kazuma Nomoto, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/433,727
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 4, 2019, PCT No. PCT/JP2019/008267
§ 371(c)(1), (2) Date Aug. 25, 2021,
PCT Pub. No. WO2020/178927, PCT Pub. Date Sep. 10, 2020.
Prior Publication US 2022/0200364 A1, Jun. 23, 2022
Int. Cl. H02K 1/04 (2006.01); H02K 1/18 (2006.01); H02K 1/27 (2022.01); H02K 5/08 (2006.01)
CPC H02K 1/04 (2013.01) [H02K 1/18 (2013.01); H02K 1/27 (2013.01); H02K 5/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A motor comprising:
an annular stator core having a plurality of core segments connected via connecting portions in a circumferential direction about an axis;
a cover portion covering the stator core and having a core-surrounding portion surrounding the stator core from an outer side in a radial direction about the axis and a core-adjacent portion projecting from the stator core in a direction of the axis; and
a rotor having a rotor core provided on an inner side of the stator core in the radial direction and a magnet attached to the rotor core, the magnet forming a first magnetic pole, and a part of the rotor core forming a second magnetic pole,
wherein a minimum distance R1 in the radial direction from the axis to an outer circumference of the core-surrounding portion and a minimum distance R2 in the radial direction from the axis to an outer circumference of the stator core satisfy:
R1≥1.15×R2,
wherein the core-surrounding portion and the core-adjacent portion are formed of materials having different mechanical property,
wherein the core-surrounding portion has a higher strength than the core-adjacent portion, and
wherein a minimum thickness T1 of the core-surrounding portion in the radial direction is thicker than a minimum thickness T2 of the core-adjacent portion in the radial direction.