| 主权项 |
1. A rotor for a rotary electric machine by comprising
a rotor core including a plurality of magnetic poles provided at intervals, in a circumferential direction of the rotor core, at an outer periphery of the rotor core, each of the magnetic poles having a first permanent magnet buried in the center of the magnetic pole, in the circumferential direction, and a pair of second permanent magnets that are buried on both sides of the first permanent magnet, in the circumferential direction, and that are disposed such that a mutual spacing between the pair of the second permanent magnets becomes narrower inward in a radial direction of the rotor core, wherein the narrowest spacing between the pair of second permanent magnets is set to be wider than a width of the first permanent magnet in a direction perpendicular to the radial direction in a magnetic path region that is formed by being surrounded by the first permanent magnet and the pair of second permanent magnets, as viewed along an axial direction of the rotor core, wherein each of the magnetic poles has a first magnetic flux suppression hole that is formed at a position opposite the first permanent magnet across the magnetic path region, between inner periphery-side end portions, in the radial direction, of the pair of second permanent magnets, the first permanent magnet, the second permanent magnets and the first magnetic flux suppression hole defining the first magnetic path region; in each of the magnetic poles, a second magnetic path region is formed on an inner periphery side, in the radial direction, of the first magnetic path region with the first magnetic flux suppression hole interposed between the first magnetic path region and the second magnetic path region; each of the magnetic poles further has a pair of third permanent magnets buried on both sides of the pair of second permanent magnets in the circumferential direction, and disposed such that a mutual spacing between the pair of third permanent magnets becomes narrower inward in the radial direction, and a second magnetic flux suppression hole formed opposite the first magnetic flux suppression hole across the second magnetic path region, between inner periphery-side end portions in the radial direction, of the pair of third permanent magnets; the second magnetic path region is defined by the second and third permanent magnets as well as the first and second magnetic flux suppression holes, on an inner periphery side, in the radial direction, of the first magnetic path region; and in the second magnetic path region, the narrowest spacing between the pair of third permanent magnets is set to be equal to or greater than a width between edge portions, outward in the circumferential direction, of the pair of second permanent magnets, in a direction perpendicular to the radial direction. |
