Permanent magnet rotor with inner and outer circumferential inclined ribs

Patent metadata

Field	Value
Publication number	US-9780613-B2
Application number	US-201414178169-A
Country	US
Kind code	B2
Filing date	Feb 11, 2014
Priority date	Feb 14, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A rotor includes a rotor core, a plurality of permanent magnets, and a rotating shaft. The rotor core includes a through-hole, an inner circumference-side rotor core, an outer circumference-side rotor core, an annular portion, a plurality of inner circumference-side ribs, and a plurality of outer circumference-side ribs. The through-hole is provided on a first inner circumference side of magnet insertion holes. The inner circumference-side rotor core is located on a second inner circumference side of the through-hole. The outer circumference-side rotor core is located on an outer circumference side of the through-hole. The annular portion has a substantially annular shape, and is being provided inside the through-hole. The plurality of inner circumference-side ribs connect the inner circumference-side rotor core and the annular portion and are provided at predetermined intervals in a circumferential direction.

First claim

What is claimed is:

1. A rotor for a rotating electric machine, comprising:
a rotor core having a substantially annular shape and including a rotation axis around which the rotor core is to be rotated, the rotor core including a shaft hole extending along the rotation axis and a plurality of magnet insertion holes provided at predetermined intervals in a circumferential direction of the rotor core;
a plurality of permanent magnets provided in the plurality of magnet insertion holes, respectively;
a rotating shaft press-fitted into the shaft hole provided in the rotor core; and
the rotor core comprising:
a through-hole provided on a first inner circumference side of the magnet insertion holes, the through-hole positioned forming a substantially annular shape and penetrating the rotor core along the rotation axis;
an inner circumference-side rotor core located on a second inner circumference side of the through-hole;
an outer circumference-side rotor core located on an outer circumference side of the through-hole;
an annular portion having a substantially annular shape, the annular portion being provided in a radially inner side of inside the through-hole;
a plurality of inner circumference-side ribs connecting the inner circumference-side rotor core and the annular portion and provided at predetermined intervals in the circumferential direction; and
a plurality of outer circumference-side ribs connecting the outer circumference-side rotor core and the annular portion and provided at predetermined intervals in the circumferential direction,

wherein the plurality of inner circumference-side ribs includes first inner circumference-side ribs that extend outward at a first inclined angle with respect to a radial direction of the rotor core,
wherein the plurality of outer circumference-side ribs includes first outer circumference-side ribs that extend outward at a second inclined angle with respect to the radial direction of the rotor core, the first inclined angle being different from the second inclined angle,
wherein the plurality of inner circumference-side ribs has a radial width shorter than a radial width of the plurality of outer circumference-side ribs, and
wherein the plurality of outer circumference-side ribs have a higher rigidity against pulling toward the outer circumference side, than a rigidity of the plurality of inner circumference-side ribs against pulling toward the outer circumference side.

2. The rotor for a rotating electric machine according to claim 1 , wherein:
the plurality of inner circumference-side ribs extend to one side in the circumferential direction, from the inner circumference-side rotor core toward the annular portion; and
each of the plurality of outer circumference-side ribs has
the first outer circumference-side rib that extends to one side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core, and
a second outer circumference-side rib that extends to another side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core.

3. The rotor for a rotating electric machine according to claim 1 , wherein:
each of the plurality of inner circumference-side ribs has
the first inner circumference-side rib that extends to one side in the circumferential direction, from the inner circumference-side rotor core toward the annular portion, and
a second inner circumference-side rib that extends to another side in the circumferential direction, from the inner circumference-side rotor core toward the annular portion;

each of the plurality of outer circumference-side ribs has
the first outer circumference-side rib that extends to one side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core, and
a second outer circumference-side rib that extends to another side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core; and

the first inner circumference-side rib and the second inner circumference-side rib form an included angle larger than an included angle formed by the first outer circumference-side rib and the second outer circumference-side rib.

4. The rotor for a rotating electric machine according to claim 1 , wherein:
each of the plurality of inner circumference-side ribs has
the first inner circumference-side rib that extends to one side in the circumferential direction, from the inner circumference-side rotor core toward the annular portion, and
a second inner circumference-side rib that extends to another side in the circumferential direction, from the inner circumference-side rotor core toward the annular portion;

each of the plurality of outer circumference-side ribs has
the first outer circumference-side rib that extends to one side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core, and
a second outer circumference-side rib that extends to another side in the circumferential direction, from the annular portion toward the outer circumference-side rotor core; and

with reference to a center of the rotor core, the plurality of inner circumference-side ribs that are adjacent to each other have an angular interval larger than an angular interval between the plurality of outer circumference-side ribs that are adjacent to each other.

5. The rotor for a rotating electric machine according to claim 3 , wherein a number of the plurality of inner circumference-side ribs and a number of the plurality of outer circumference-side ribs are set equal to each other.

6. The rotor for a rotating electric machine according to claim 3 , wherein:
the inner circumference-side rotor core has first middle portions, and the first inner circumference-side rib extends to one side in the circumferential direction and the second inner circumference-side rib extends to another side in the circumferential direction, from each of the first middle portions toward the annular portion;
the annular portion has second middle portions, and the first outer circumference-side rib extends to one side in the circumferential direction and the second outer circumference-side rib extends to another side in the circumferential direction, from each of the second middle portions toward the outer circumference-side rotor core; and
the first middle portions and the second middle portions are located at substantially a same position with respect to the circumferential direction.

7. The rotor for a rotating electric machine according to claim 1 , wherein the first inclined angle is greater than the second inclined angle.

8. The rotor for a rotating electric machine according to claim 1 ,
wherein the first inner circumference-side ribs extend outward at the first inclined angle in a first circumferential direction about the rotor core, and
wherein the first outer circumference-side ribs extend outward at the second inclined angle in the first circumferential direction about the rotor core.

9. The rotor for a rotating electric machine according to claim 1 ,
wherein the plurality of inner circumference-side ribs includes second inner circumference-side ribs that extend outward at a third inclined angle with respect to a radial direction of the rotor core, the third inclined angle being identical in magnitude to the first inclined angle, the second inner circumference-side ribs extending outward at the third inclined angle in a circumferential direction about the rotor core that is opposite to the first inclined angle of the first inner circumference-side ribs.

10. The rotor for a rotating electric machine according to claim 1 ,
wherein the

Assignees

• Honda Motor Co Ltd

Inventors

• Yamaguchi Tadashi
• Inoue Masashi
• Matsuoka Yoshihisa

Classifications

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• H02K1/274

  the rotor consisting of two or more circumferentially positioned magnets · CPC title

• H02K1/30

  using intermediate parts, e.g. spiders · CPC title

• H02K1/2706

  Inner rotors · CPC title

• H02K1/276

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title