| 摘要 |
A rotor of a permanent magnet embedded motor that can reduce the magnetic flux acting on end portions of permanent magnets that are likely to be magnetized and that has improved demagnetization resistance when slits are provided in an outer-peripheral side iron core portion outside of each of permanent-magnet insertion holes is provided. The rotor of a permanent magnet embedded motor according to the present invention includes a rotor iron core formed by stacking a predetermined number of magnetic steel sheets punched into predetermined shapes, a plurality of permanent-magnet insertion holes formed along an outer circumferential portion of the rotor iron core and each including permanent-magnet end-portion cavities on both end portions, respectively, a plurality of permanent magnets inserted into the permanent-magnet insertion holes, respectively, and a plurality of slits formed in the outer-peripheral side iron core portion outside of each of the permanent-magnet insertion holes. A distance between a first slit present in a radial direction of each of the end portions of the permanent magnets and a second slit adjacent to the first slit and closer to a center of each magnetic pole among the slits is smaller than a distance between the slits other than the first and second slits and present in the radial direction of the outer-peripheral side iron core portion outside of each of the permanent-magnet insertion holes. |
