Patent ID: 9595851
Date: 2017-03-14
CPC Classifications: H02K

Claim:
1. A rotary electric machine comprising a rotor in which a plurality of permanent magnets are each embedded on an outer circumferential side of a rotor core and are disposed at a set pitch in a circumferential direction to form magnetic poles, and in which each of said permanent magnets that forms a magnetic pole is configured by arranging three magnet blocks so as to be spaced apart from each other circumferentially, wherein: said three magnet blocks are each formed such that a cross-sectional shape that is perpendicular to a central axis of said rotor core is radially outwardly convex, and a circumferential width of magnet blocks that are nearest to interpolar centers is narrowest; and said three magnet blocks that are arranged circumferentially are configured so as to have mirror symmetry relative to a plane that passes through a magnetic pole center and a central axis of said rotor core, directions of magnetization of said three magnet blocks that form North-seeking (N) poles are magnetically oriented in directions that are radially outward and toward said magnetic pole center; directions of magnetization of said three magnet blocks that form South-seeking (S) poles are magnetically oriented in directions that are radially inward and away from said magnetic pole center; and a direction of magnetization of a first magnet block of said three magnet blocks that is disposed at said magnetic pole center is a radial direction, and where θb is a circumferential width of said first magnet block that is disposed at said magnetic pole center, θc is a circumferential width of second and third magnet blocks of said three magnet blocks that are disposed on interpolar sides, and α is an angle of orientation of said second and third magnet blocks that are disposed on said interpolar sides, said α satisfies α1min ≦α≦α1max, where said α1min and said α1max are: α1min=39.7−4.8×(θb/θc)(degrees)(where θb/θc≦8.27); α1min=0(degrees)(where θb/θc>8.27); α1max=59.7−4.8×(θb/θc)(degrees)(where θb/θc≦10.35); and α1max=10(degrees)(where θb/θc>10.35).