Rotor for rotary electric machine

摘要

A plurality of magnetic poles are disposed at intervals, in a circumferential direction, at an outer periphery of a rotor core. Each magnetic pole has a pair of permanent magnets disposed spaced apart from each other in the circumferential direction, and a magnetic flux suppression hole that suppresses flow of magnetic flux and that is formed extending on the inward side in the radial direction, between inner-periphery-side end portions of each permanent magnet. The magnetic flux suppression hole is formed of two first holes respectively communicating with magnet insertion holes into which the permanent magnets are inserted, and a second hole that is formed between the first holes with bridge portions interposed therebetween. An outer-periphery-side end portion of the second hole is positioned further outward than an imaginary straight line that passes through the inner-periphery-side end portions of the pair of permanent magnets.

主权项

1. A rotor for a rotary electric machine, comprising:
a rotor core in which a plurality of magnetic poles are provided at intervals, in a circumferential direction of the rotor core, at an outer periphery of the rotor core in a radial direction, wherein each of the magnetic poles has a pair of permanent magnets disposed spaced apart from each other in the circumferential direction, and a magnetic flux suppression hole that suppresses flow of magnetic flux and that is formed, between inner-periphery-side end portions of the permanent magnets, in the radial direction, such that the magnetic flux suppression hole extends inwards in the radial direction; the magnetic flux suppression hole has two first holes respectively communicating with magnet insertion holes into which the permanent magnets are inserted, and a second hole that is formed between the first holes with bridge portions interposed between the second hole and the first holes; and an outer-periphery-side end portion of the second hole in the radial direction is positioned further outward in the radial direction than an imaginary straight line that passes through the inner-periphery-side end portions of the pair of permanent magnets, only two bridge portions are provided between the two first holes and the second hole, respectively, each of outer-periphery-side end portions of the first holes and the outer-periphery-side end portion of the second hole is formed in a straight line shape parallel to the direction of the imaginary straight line, and each of the bridge portions are offset from each of the inner-periphery-side end portions of the pair of permanent magnets to a side of a magnetic pole centerline, which is a radial direction line that passes through a center position of the magnetic pole in the circumferential direction.