| 摘要 |
A rotor of an interior permanent magnet motor includes a rotor core 2; permanent magnet insertion holes 5 formed in an outer circumferential portion of the rotor core 2 along a circumferential direction; a permanent-magnet end-portion air gap 8 formed in each of both end portions of each permanent magnet insertion hole 5; a permanent magnet 3 inserted in each permanent magnet insertion hole 5; and slits 7 formed in an outer circumferential core portion on an outer side in a radial direction with respect to each permanent magnet insertion hole, wherein three or more of the slits 7 are present in an angular range of 360/(number of poles × 3) degrees from an interpolar line 9, and a width of a core present between the permanent-magnet end-portion air gap 8 and the slit 7 and a width of a core present between the slits 7 are such that a width of a core gradually increases as the core is closer to a magnet pole center 10 from the interpolar line 9. |
