US 11,888,353 B2
Motor, compressor, and air conditioner
Atsushi Ishikawa, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/042,545
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Apr. 10, 2018, PCT No. PCT/JP2018/014989
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/198138, PCT Pub. Date Oct. 17, 2019.
Prior Publication US 2021/0036562 A1, Feb. 4, 2021
Int. Cl. H02K 1/27 (2022.01); F25B 1/04 (2006.01); H02K 21/14 (2006.01); H02K 1/276 (2022.01); H02K 1/278 (2022.01)
CPC H02K 1/2766 (2013.01) [F25B 1/04 (2013.01); H02K 1/278 (2013.01); H02K 21/14 (2013.01); H02K 2201/03 (2013.01); H02K 2213/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A motor comprising:
a rotor rotatable about a rotation axis; and
a stator surrounding the rotor so as to form an air gap between the stator and the rotor,
wherein the rotor has a rotor core having a magnet insertion hole, and a rare earth magnet provided in the magnet insertion hole;
wherein the rotor core has a plurality of slits on an outer side of the magnet insertion hole in a radial direction about the rotation axis, flux barriers at both ends of the magnet insertion hole in a circumferential direction about the rotation axis, and side slits each of which is formed between a corresponding flux barrier and the plurality of slits in the circumferential direction;
wherein each of the plurality of slits has a length in the radial direction which is longer than a length in the circumferential direction;
wherein each of the side slits has a length in the circumferential direction which is longer than a length in the radial direction;
wherein the plurality of slits have a uniform minimum distance to the magnet insertion hole;
wherein when the minimum distance is expressed as T and the air gap is expressed as G, 2.75≤T/G≤5.25 is satisfied; and
wherein a side slit minimum distance from the side slit to the magnet insertion hole is shorter than the minimum distance T.