EMBEDDED-PERMANENT-MAGNET ELECTRIC MOTOR

摘要

Provided is an interior permanent magnet motor including: a stator; and a rotor, the rotor including separated permanent magnets for one magnetic pole, in which: a rotor core includes the same number of separated magnet insertion holes as that of the plurality of permanent magnets for one magnetic pole; bridges are formed between respective adjacent ones of the magnet insertion holes in each magnetic pole; each of the bridges includes a pair of parallel linear portions and two pairs of curved portions; under a state in which the permanent magnets are inserted into the magnet insertion holes, the pair of linear portions are in contact with edge surfaces of the permanent magnets; the pair of curved portions are connected to ends of the linear portions; and an interval between the pair of curved portions becomes larger as the interval becomes away from the linear portions.

主权项

1. An interior permanent magnet motor, comprising:
a stator; and a rotor rotatably supported to face the stator, the rotor comprising a plurality of separated permanent magnets for one magnetic pole, wherein a rotor core of the rotor comprises a plurality of the same number of separated magnet insertion holes as a number of the plurality of permanent magnets for one magnetic pole, wherein bridges are formed between respective adjacent ones of the magnet insertion holes in each magnetic pole, wherein each of the bridges comprises a pair of parallel linear portions and two pairs of curved portions, wherein, under a state in which the plurality of permanent magnets are inserted into the plurality of corresponding magnet insertion holes, each of the pair of linear portions is in contact with a corresponding edge surface of the corresponding permanent magnet in an arrayed direction, wherein the two pairs of curved portions are connected to corresponding ends of the linear portions in an extending direction of the linear portions and an interval between the pair of corresponding curved portions becomes larger as the interval becomes away from the linear portions, and wherein an end point Y of the return portion is located at a position closer to the linear portion than a protruding end Z of the bridge when viewed in a bridge width direction.