Rotor of interior permanent magnet motor, compressor, and refrigerating air-conditioning apparatus

A rotor of an interior permanent magnet motor comprising:

• a rotor core;
• a plurality of permanent magnet insertion holes that are formed in an outer circumferential portion of the rotor core along a circumferential direction;
• a permanent-magnet end-portion air gap that is formed in each of both end portions of each of the permanent magnet insertion holes;
• a permanent magnet that is inserted in each of the permanent magnet insertion holes;
• and
• a plurality of slits that are formed in an outer circumferential core portion that is on an outer side in a radial direction with respect to each of the permanent magnet insertion holes, wherein
• in an angular range of 360/(number of poles×3) degrees from an interpolar line, a width of a core present between the permanent-magnet end-portion air gap and the slit and a width of a core present between adjacent slits are such that a width of a core gradually increases as the core is closer to a magnet pole center from the interpolar line, and
• a width of a core on a most magnetic pole center side, which is present between adjacent slits in an angular range of 360/(number of poles×3) degrees from the interpolar line, is equal to or larger than a width of a core that is a width of a core between adjacent slits and is present in an angular range larger than 360/(number of poles×3) degrees from the interpolar line.