Rotor for rotating electric machine

A rotor for a rotating electric machine, the rotor comprising:

• a 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 a radially outer periphery of the rotor core;
• 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 rotor core further has, for each pair of the magnet-receiving holes, a corresponding center bridge that extends in a radial direction of the rotor core between the two magnet-receiving holes of the pair to separate them from each other,
• for each of the magnet-receiving holes, there are also formed a first protrusion, a second protrusion and a magnetic flux barrier in the rotor core,
• the first protrusion protrudes from the corresponding center bridge inward of the magnet-receiving hole, so as to position the corresponding magnet received in the magnet-receiving hole,
• the first protrusion is positioned closer to a radially outer end of the corresponding center bridge than a radially inner end of the corresponding center bridge,
• the second protrusion protrudes from a wall surface of the magnet-receiving hole, so as to position the corresponding magnet received in the magnet-receiving hole on the opposite side of the corresponding magnet to the corresponding center bridge,
• the magnetic flux barrier is positioned at a radially innermost corner portion of the magnet-receiving hole and defined by a curved surface that includes three or more single-curvature surfaces having different curvatures, and
• among the single-curvature surfaces, the single-curvature surface which has the minimum curvature is positioned closest to the longitudinal axis of the rotor core,
• wherein
• for each pair of the magnet-receiving holes of the rotor core, an imaginary straight line, which extends through both the first and second protrusions formed in one of the two magnet-receiving holes of the pair, also passes through the first protrusion formed in the other of the two magnet-receiving holes.