ELECTRIC MOTOR HAVING EMBEDDED PERMANENT MAGNETS

摘要

A rotor of an interior permanent magnet motor includes a rotor core having a plurality of magnet insertion holes, a shaft, a plurality of rare-earth magnets, and a pair of magnet fixing members. One surface of the magnet fixing member is provided with a plurality of pairs of tongue-like portions, and the tongue-like portions are inserted into the magnet insertion holes. On each of both sides in a rotary shaft direction, the rare-earth magnets have both end surfaces in a rotor circumferential direction sandwiched by a corresponding pair of tongue-like portions. An interval between the tongue-like portions includes, at a position separated from a base position, an interval that is smaller than the width of the rare-earth magnet in the rotor circumferential direction.

主权项

1. An interior permanent magnet motor, comprising:
a rotor provided so as to be rotatable; and a stator provided so as to be opposed to the rotor, wherein the rotor comprises:
a rotor core;a shaft for supporting the rotor core;a plurality of permanent magnets embedded in the rotor core; anda pair of magnet fixing members provided on both end surfaces of the rotor core in a rotary shaft direction, wherein the rotor core has a plurality of magnet insertion holes formed therein, wherein corresponding one of the permanent magnets is inserted into corresponding one of the magnet insertion holes, wherein one surface of each of the magnet fixing members is provided with a plurality of pairs of tongue-like portions, wherein, in each of the magnet fixing members, a corresponding pair of tongue-like portions is inserted into corresponding one of the magnet insertion holes so that each of the permanent magnets has both end surfaces in the rotor circumferential direction sandwiched by the corresponding pair of tongue-like portions on each of both sides in the rotary shaft direction, wherein an interval between the pair of tongue-like portions comprises, at a position separated from a base position and under a state before the corresponding permanent magnet is sandwiched, an interval (Dmin) that is smaller than a width (L) of the permanent magnet in the rotor circumferential direction, and wherein an interval (Da) between leading end positions of the pair of tongue-like portions is larger than the width (L) of the permanent magnet in the rotor circumferential direction under the state before the corresponding permanent magnet is sandwiched.