US 11,837,920 B2
Rotor, motor, compressor, air conditioner, and manufacturing method of rotor
Takanori Watanabe, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/279,350
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Nov. 7, 2018, PCT No. PCT/JP2018/041285
§ 371(c)(1), (2) Date Mar. 24, 2021,
PCT Pub. No. WO2020/095374, PCT Pub. Date May 14, 2020.
Prior Publication US 2021/0408850 A1, Dec. 30, 2021
Int. Cl. H02K 1/27 (2022.01); H02K 1/28 (2006.01); H02K 15/02 (2006.01); H02K 1/276 (2022.01); F24F 1/0018 (2019.01); F24F 1/38 (2011.01); F25B 31/02 (2006.01); H02K 1/08 (2006.01)
CPC H02K 1/276 (2013.01) [F24F 1/0018 (2013.01); F24F 1/38 (2013.01); F25B 31/026 (2013.01); H02K 1/08 (2013.01); H02K 1/28 (2013.01); H02K 15/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotor comprising:
a rotor core having magnet insertion holes in a number corresponding to a pole number in a circumferential direction about an axis, and a center hole at a center portion of the rotor core in a radial direction about the axis; and
a shaft inserted in the center hole,
the rotor core having a plurality of first slits and a plurality of ribs alternately arranged in the circumferential direction along a periphery of the center hole, and a plurality of second slits on an outer side with respect to the plurality of first slits in the radial direction,
wherein the plurality of first slits are equal in number to half or an integer multiple of the pole number, and the plurality of second slits are equal in number to half or an integer multiple of the pole number;
wherein each of the plurality of second slits is formed to cover a corresponding rib of the plurality of ribs from an outer side in the radial direction;
wherein each of the plurality of first slits has a length A1 in the circumferential direction and a width A2 in the radial direction;
wherein each of the plurality of second slits has a length B1 in the circumferential direction and a width B2 in the radial direction; and
A1>A2, B1>B2, and A1>B1 are satisfied.