Rotor for permanent magnet motor having a magnetic pole portion and a field portion

Patent metadata

Field	Value
Publication number	US-9812912-B2
Application number	US-201415125981-A
Country	US
Kind code	B2
Filing date	Mar 18, 2014
Priority date	Mar 18, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A rotor for a permanent magnet motor, includes a magnetic pole portion that includes a 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 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.

First claim

The invention claimed is:

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.

2. 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 second magnetic bodies, 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 field portion is formed by disposing in an annular shape a plurality of fan-shaped permanent magnets with a field-portion slit being put therebetween, the permanent magnets each being sandwiched between the second magnetic bodies at both ends in a circumferential direction and being magnetized in a same circumferential direction.

3. The rotor for a permanent magnet motor according to claim 2 , 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.

4. The rotor for a permanent magnet motor according to claim 3 , wherein a flat plate-shaped permanent magnet that is magnetized in the circumferential direction to face toward the second magnetic body generating an N magnetic pole is disposed in the magnetic-pole portion slit.

5. The rotor for a permanent magnet motor according to claim 3 , wherein 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.

6. The rotor for a permanent magnet motor according to claim 5 , wherein 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.

7. 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 field portion is formed by disposing in an annular shape a plurality of fan-shaped permanent magnets magnetized in a circumferential direction with the second magnetic body being put therebetween in such a manner that directions of magnetization are alternately opposite to each other.

8. The rotor for a permanent magnet motor according to claim 7 , 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.

9. The rotor for a permanent magnet motor according to claim 8 , wherein a flat plate-shaped permanent magnet that is magnetized in the circumferential direction to face toward the second magnetic body generating an N magnetic pole is disposed in the magnetic-pole portion slit.

10. The rotor for a permanent magnet motor according to claim 8 , wherein 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.

11. The rotor for a permanent magnet motor according to claim 10 , wherein 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.

12. 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 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,
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, and
the field portion

Assignees

• Mitsubishi Electric Corp

Inventors

• Kobayashi Hiroki
• Horisaka Kentaro
• Ozaki Kenta
• Naka Koki
• Otsuka Hisashi

Classifications

• H02K1/2713 Primary

  the magnetisation axis of the magnets being axial, e.g. claw-pole type · CPC title

• H02K1/2753

  the rotor consisting of magnets or groups of magnets arranged with alternating polarity · CPC title

• H02K1/2706

  Inner rotors · CPC title