US 11,942,827 B2
Rotor, motor, compressor, and refrigeration and air-conditioning device
Atsushi Ishikawa, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 17/277,039
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Oct. 30, 2018, PCT No. PCT/JP2018/040229
§ 371(c)(1), (2) Date Mar. 17, 2021,
PCT Pub. No. WO2020/089991, PCT Pub. Date May 7, 2020.
Prior Publication US 2021/0273507 A1, Sep. 2, 2021
Int. Cl. H02K 21/14 (2006.01); F25B 31/02 (2006.01); H02K 1/276 (2022.01)
CPC H02K 1/2766 (2013.01) [F25B 31/026 (2013.01); H02K 21/14 (2013.01); H02K 2213/03 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A rotor comprising:
an electromagnetic steel sheet including a first magnet insertion hole, a second magnet insertion hole, and a center rib between the first magnet insertion hole and the second magnet insertion hole, the first magnet insertion hole and the second magnet insertion hole being arranged in a V shape in a plane orthogonal to an axial direction;
a first permanent magnet disposed in the first magnet insertion hole; and
a second permanent magnet disposed in the second magnet insertion hole, wherein
the rotor satisfies T≤W1≤2×T≤W2, W1<W2, and 0.9≤W1/T≤1.9,
where T is a thickness of the electromagnetic steel sheet, W1 is a minimum width of the center rib in a direction orthogonal to a radial direction, and W2 is a maximum width of the center rib in the direction orthogonal to the radial direction, wherein
a location having the minimum width W1 is a radially outer end of the center rib.