Patent ID: 6906444

Claim:
A rotor for a permanent magnet motor, comprising: a rotor core main body; a plurality of magnetic-flux holding portions integral with the rotor core main body and arranged at a predetermined angular interval circumferentially with respect to the rotor core main body; a plurality of magnet insertion hole groups disposed in a single radial layer about a rotation axis of the rotor core main body, each group having at least three magnet insertion holes, each presenting a predetermined shape having end portions separated from each other, each group being disposed between a corresponding one of the magnetic-flux holding portions and the rotor core main body; a plurality of outer peripheral connecting portions integral with the rotor core main body and magnetic-flux holding portions, each connecting portion connecting the rotor core main body to a corresponding one of the magnetic-flux holding portions at a position approximate a respective one of the end portions; and a plurality of ribs integral with the rotor core main body and magnetic-flux holding portions, each connecting the rotor core main body to a corresponding one of the magnetic-flux holding portions at a position within the predetermined shape, thereby each magnet insertion hole group includes at least two ribs thereby dividing each magnet insertion hole group into the at least three magnet insertion holes, wherein opposing side surface of adjacent magnets within each magnet insertion holes group are substantially parallel to each other.