US 12,445,001 B2
Rotor, motor, and electric product
Ta-Yin Luo, Taipei (TW); Yu-Wei Hsu, Taipei (TW); Sheng-Chan Yen, Taipei (TW); Pei-Chun Shih, Taipei (TW); Hsin-Nan Lin, Taipei (TW); Guo-Jhih Yan, Taipei (TW); and Cheng-Tsung Liu, Kaohsiung (TW)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Appl. No. 17/925,592
Filed by Nidec Corporation, Kyoto (JP)
PCT Filed Apr. 26, 2021, PCT No. PCT/JP2021/016583
§ 371(c)(1), (2) Date Nov. 15, 2022,
PCT Pub. No. WO2021/230056, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 202010415194.7 (CN), filed on May 15, 2020.
Prior Publication US 2023/0198323 A1, Jun. 22, 2023
Int. Cl. H02K 1/24 (2006.01); H02K 19/10 (2006.01)
CPC H02K 1/246 (2013.01) [H02K 19/103 (2013.01); H02K 2213/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A motor comprising:
a rotation shaft extending along a center axis;
a rotor provided on an outer periphery of the rotation shaft and rotatable together with the rotation shaft; and
a stator radially opposed to the rotor; wherein
the rotor includes a rotor core made of a magnetic material;
the rotor includes flux barriers penetrating the rotor core along an axial direction;
in a plane orthogonal to the axial direction, among a plurality of the flux barriers corresponding to each pole of the rotor, at least two of the flux barriers are entirely located within an extending angle, a magnitude of the extending angle is determined by a number of poles of the rotor and a number of phases of the motor, a center line of the extending angle is a q-axis of the rotor, a ratio between an area of the flux barriers entirely located within the extending angle and an area of all flux barriers corresponding to each pole is about ½ or more, and a ratio between a difference between an area of a radially innermost flux barrier entirely located within the extending angle and an area of a radially outermost flux barrier entirely located within the extending angle and a smaller one of the two areas is about 10% or less.