Patent ID: 9660491
Date: 2017-05-23
CPC Classifications: H02K

Claim:
1. A rotor for a rotating electric machine, the rotor comprising: a hollow cylindrical rotor core configured to be disposed in radial opposition to a stator of the rotating electric machine, the rotor core having a longitudinal axis and a plurality of pairs of magnet-receiving holes formed therein, each pair of the magnet-receiving holes being arranged in a substantially V-shape that opens toward the stator side; and a plurality of magnets each of which is received in a corresponding one of the magnet-receiving holes of the rotor core, wherein for each pair of the magnet-receiving holes of the rotor core, the two corresponding magnets which are respectively received in the two magnet-receiving holes of the pair are arranged so as to together form one magnetic pole of the rotor, the magnetic pole having a centerline C the rotor core further has a plurality of q-axis core portions through which q-axis magnetic flux flows, a plurality of first magnetic flux barriers and a plurality of second magnetic flux barriers, each of the q-axis core portions is formed between one circumferentially-adjacent pair of the magnetic poles of the rotor and has a centerline L1 that radially extends to bisect the q-axis core portion in the circumferential direction of the rotor core, each of the first magnetic flux barriers is formed between a corresponding one of the q-axis core portions of the rotor core and a corresponding one of the magnets that are respectively received in the corresponding magnet-receiving holes of the rotor core, each of the second magnetic flux barriers is formed so as to extend from a centerline C in the rotor core, the following dimensional relationships are satisfied: where W 1 is a width between the centerlines L 1 of the q-axis core portions and the corresponding first magnetic flux barriers, W 2 is a width between the centerlines L 1 of the q-axis core portions and the corresponding second magnetic flux barriers, and W 3 is a radial width between a radially inner surface of the rotor core and the second magnetic flux barriers, and each of the second magnetic flux barriers also extends from a point on the corresponding magnet received in the corresponding magnet-receiving hole of the rotor core in the circumferential direction away from the centerline C