Patent ID: 9577483
Date: 2017-02-21
CPC Classifications: H02K

Claim:
1. A rotor comprising: a plurality of permanent magnets; and an annular rotor iron core having a plurality of magnet insertion holes formed in a circumferential direction into which the permanent magnets are inserted respectively, wherein each magnet insertion hole of the plurality of magnet insertion holes has an inner wall surface with a protruding portion, the protruding portion being provided on at least one of an outer diameter side and an inner diameter side of the inner wall surface and extending in a radial direction of the rotor iron core, and each permanent magnet of the permanent magnets has a recessed portion that is fitted to the protruding portion of a corresponding magnet insertion hole of the plurality of magnetic insertion holes, the outer diameter side of each permanent magnet has circumferential opposing ends, the circumferential opposing ends of the permanent magnets respectively have flat end faces and voids, the voids of the circumferential opposing ends of each permanent magnet are provided respectively between the flat end faces of the circumferential opposing ends and a wall surface of the annular rotor iron core, and each of the voids has a length in a direction along the flat end face of the circumferential opposing end of the permanent magnet greater than a maximum distance between the flat end face of the circumferential opposing end of the permanent magnet and the inner wall surface in the radial direction of the rotor iron core.