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

摘要

A rotor of an interior permanent magnet motor includes a rotor core; permanent magnet insertion holes formed in an outer circumferential portion of the rotor core along a circumferential direction; a permanent-magnet end-portion air gap formed in each of both end portions of each permanent magnet insertion hole; a permanent magnet inserted in each permanent magnet insertion hole; and slits formed in an outer circumferential core portion on an outer side in a radial direction with respect to each permanent magnet insertion hole, wherein 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 the 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.

主权项

1. 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 between adjacent interpolar lines which are adjacent to each other,
in each angular range of 360/(number of poles×3) degrees from each of the adjacent interpolar lines:
a width of a core present between the permanent-magnet end-portion air gap and a slit of the plurality of slits which is adjacent to the permanent-magnet end-portion air gap and a width of a core present between adjacent slits of the plurality of slits which are adjacent to each other in said each angular range of 360/(number of poles/3) degrees from the interpolar line are such that the width of a core gradually increases as the core is closer to a magnet pole center from the interpolar line, the magnet pole center being between the adjacent interpolar lines, anda width of the core present between the adjacent slits on a most magnetic pole center side of said each angular range of 360/(number of poles×3) degrees from each of the adjacent interpolar lines, is equal to or larger than a width of a core between adjacent slits that is present between the adjacent interpolar lines in an angular range larger than 360/(number of poles×3) degrees from both of the adjacent interpolar lines, the number of poles being a total number of poles in the rotor.