US 9,812,912 B2
Rotor for permanent magnet motor having a magnetic pole portion and a field portion
Hiroki Kobayashi, Tokyo (JP); Kentaro Horisaka, Tokyo (JP); Kenta Ozaki, Tokyo (JP); Koki Naka, Tokyo (JP); and Hisashi Otsuka, Tokyo (JP)
Assigned to Mitsubishi Electric Corporation, Tokyo (JP)
Appl. No. 15/125,981
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 18, 2014, PCT No. PCT/JP2014/057411
§ 371(c)(1), (2) Date Sep. 14, 2016,
PCT Pub. No. WO2015/140941, PCT Pub. Date Sep. 24, 2015.
Prior Publication US 2017/0098971 A1, Apr. 6, 2017
Int. Cl. H02K 1/27 (2006.01)
CPC H02K 1/2713 (2013.01) [H02K 1/2706 (2013.01); H02K 1/2753 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A rotor for a permanent magnet motor, comprising:
a magnetic pole portion that includes a first magnetic body formed in an annular shape; and
a field portion that is disposed adjacent to the magnetic pole portion in an axial direction, that includes a permanent magnet formed in an annular shape and having a multipole structure or a plurality of permanent magnets formed in an annular shape and having a monopole structure and a second magnetic body, and that causes a magnetic flux generated by the permanent magnet to flow in the axial direction so as to generate magnetic poles on an outer circumferential surface of the magnetic pole portion, wherein
the magnetic pole portion is formed by disposing a plurality of fan-shaped magnetic bodies in an annular shape with a magnetic-pole portion slit being put therebetween,
arc-shaped plate-like magnetic bodies that are disposed in an annular shape and are spaced by an outer-circumferential portion slit having a same pitch as the magnetic-pole portion slit are fixed on an outer circumferential surface of the magnetic pole portion and the field portion, and
the magnetic-pole portion slit and the outer-circumferential portion slit are disposed in such a manner that phases thereof are shifted from each other, and each of the arc-shaped plate-like magnetic bodies is mostly fixed on an outer circumferential surface of one of the fan-shaped magnetic bodies and is partly fixed on a portion of an outer circumferential surface of an adjacent one of the fan-shaped magnetic bodies.