Rotor, rotating electric machine, electric compressor, and refrigeration/air-conditioning apparatus

A rotor comprising:

• a rotor core configured by stacking a plurality of core plates in a direction of a rotation axis such that positions of magnet insertion holes coincide with each other, each core plate including
• an inner peripheral side core portion provided at the rotation axis side of the core plate having a shape with n-fold symmetry about the rotation axis so as to correspond to a number of magnetic poles,
• an outer peripheral side core portion provided at an outer peripheral side of the core plate so as to correspond to each magnetic pole,
• the magnet insertion hole provided between the inner peripheral side core portion and the outer peripheral side core portion so as to correspond to each magnetic pole,
• a radial connection portion provided between each magnetic pole, connected to the inner peripheral side core portion, and extending in a radial direction of the core plate,
• a circumferential connection portion connected to the outer peripheral side core portion and the radial connection portion, extending in a circumferential direction of the core plate, having widths w1 and w2 in the radial direction at both ends thereof, including a minimum width portion having a width w3 in the radial direction smaller than the w1 and the w2, and having a width that smoothly decreases along a curve from both ends to the minimum width portion, and
• a thin portion including a uniform thickness portion which is provided in the circumferential connection portion and which has a thickness tc over an entire width, in the radial direction, of the circumferential connection portion and a non-uniform thickness portion which is adjacent to the uniform thickness portion provided in the circumferential connection portion and which has a thickness increasing from tc to, the thin portion having the minimum width portion within the uniform thickness portion;
• and
• permanent magnets embedded in the magnet insertion holes.