Patent ID: 9735633
Date: 2017-08-15
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 plurality of groups of holes, each of the holes including a magnet receiving hole portion and another hole portion having a magnetic flux barrier, each group including at least one pair of the magnet-receiving hole portions, the pair of the magnet-receiving hole portions 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 hole portions of the rotor core, wherein for each group of the magnet-receiving hole portions of the rotor core, all the corresponding magnets which are respectively received in the magnet-receiving hole portions of the group are arranged so as to together form one magnetic pole of the rotor, the magnetic pole having a centerline C for each group of the magnet-receiving hole portions, there are provided a pair of corresponding other hole portions having magnetic flux barriers and a corresponding center bridge in the rotor core, the corresponding other hole portions having magnetic flux barriers being formed so as to respectively extend radially inward from centerline C wherein the corresponding center bridge is configured to include a radially inner portion and a radially outer portion that is located radially outward of the radially inner portion, the radially inner portion has a greater circumferential width than the radially outer portion, the rotor core further has a plurality of q-axis core portions through which q-axis magnetic flux flows, each of the q-axis core portions being formed between one circumferentially-adjacent pair of the magnetic poles of the rotor, for each group of the magnet-receiving hole portions of the rotor core, the corresponding other hole portions having magnetic flux barriers extending radially inward of an imaginary line segment C-D which connects two points C and D, the two points C and D respectively falling at centerline C aboundary between the radially inner and radially outer portions of the corresponding center bridge is located radially inward of the imaginary line segment C-D.