Rotor, motor, blower, air conditioner, and manufacturing method of rotor

Patent metadata

Field	Value
Publication number	US-12249871-B2
Application number	US-202017796424-A
Country	US
Kind code	B2
Filing date	Mar 27, 2020
Priority date	Mar 27, 2020
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A rotor includes a rotary shaft and a rotor body supported by the rotary shaft. The rotor body includes a first permanent magnet and a second permanent magnet. The first permanent magnet has a first overhang part that is in contact with a first end part of the second permanent magnet in an axial direction of the rotary shaft, and the first overhang part and the first end part are joined to each other. A motor includes the rotor and a stator.

First claim

What is claimed is:

1. A rotor comprising:
a rotary shaft; and
a rotor body supported by the rotary shaft,
wherein the rotor body comprises a first permanent magnet and a second permanent magnet,
wherein the second permanent magnet is supported by the rotary shaft,
wherein the first permanent magnet has a plurality of pillar parts arranged at intervals in a circumferential direction of the rotor body and a first overhang part that is in contact with a first end part of the second permanent magnet in an axial direction of the rotary shaft,
wherein the first permanent magnet is supported by the second permanent magnet on an outer side of the second permanent magnet, and
wherein the first overhang part and the first end part are joined to each other.

2. The rotor according to claim 1 , wherein the first permanent magnet further has a second overhang part that is in contact with a second end part on a side in the axial direction opposite to the first end part, and
wherein the second overhang part and the second end part are joined to each other.

3. The rotor according to claim 1 , wherein the second permanent magnet has a first concave part or a first convex part formed on the first end part in the axial direction, and
wherein the first overhang part has a first fitting part that is fitted with the first concave part or the first convex part.

4. The rotor according to claim 3 , wherein the second permanent magnet has a second concave part or a second convex part formed on a second end part on a side in the axial direction opposite to the first end part,
wherein the first permanent magnet further has a second overhang part that is in contact with the second end part on the side opposite to the first end part, and
wherein the second overhang part has a second fitting part that is fitted with the second concave part or the second convex part.

5. The rotor according to claim 1 , wherein the second permanent magnet has a first step part that is recessed from the first end part toward one side in the axial direction, and
wherein the first overhang part and a bottom surface of the first step part are joined to each other.

6. The rotor according to claim 5 , wherein the second permanent magnet further has a second step part recessed from a second end part on a side in the axial direction opposite to the first end part toward another side in the axial direction,
wherein the first permanent magnet further has a second overhang part that is in contact with the second end part on the side in the axial direction opposite to the first end part, and
wherein the second overhang part and a bottom surface of the second step part are joined to each other.

7. The rotor according to claim 1 , wherein the pillar parts are situated on the outer side in a radial direction of the rotor relative to the first overhang part and supported by the second permanent magnet, and
wherein a length of the first overhang part in a circumferential direction of the rotor is greater than a length of the pillar part in the circumferential direction.

8. The rotor according to claim 7 , wherein the first permanent magnet further has a second overhang part that is in contact with a second end part on a side in the axial direction opposite to the first end part,
wherein the second overhang part and the second end part are joined to each other, and
wherein a length of the second overhang part in the circumferential direction is equal to a length of the first overhang part in the circumferential direction.

9. The rotor according to claim 7 , wherein the first permanent magnet further has a second overhang part that is in contact with a second end part on a side in the axial direction opposite to the first end part,
wherein the second overhang part and the second end part are joined to each other, and
wherein a length of the second overhang part in the circumferential direction differs from a length of the first overhang part in the circumferential direction.

10. The rotor according to claim 7 , wherein the first overhang part has a first part that extends from the pillar part toward one side in the circumferential direction of the rotor and a second part that extends from the pillar part toward another side in the circumferential direction, and
wherein the second permanent magnet is arranged between the first part and the second part in the circumferential direction.

11. The rotor according to claim 1 , wherein the first permanent magnet has a plurality of first overhang parts arranged at intervals in a circumferential direction of the rotor and having the first overhang part and a connection part that connects the plurality of first overhang parts adjoining in the circumferential direction.

12. The rotor according to claim 11 , wherein the second permanent magnet has a groove part that is formed on the first end part, and the connection part is arranged in the groove part.

13. The rotor according to claim 1 , further comprising a first resin part that is fixed to the first overhang part and the second permanent magnet in the axial direction.

14. The rotor according to claim 13 , further comprising a second resin part that connects the rotary shaft and the rotor body to each other, and
wherein the first resin part is connected to the second resin part.

15. The rotor according to claim 1 , wherein the first permanent magnet is a rare-earth bond magnet, and
wherein the second permanent magnet is a ferrite bond magnet.

16. A rotor comprising:
a rotary shaft; and
a rotor body supported by the rotary shaft,
wherein the rotor body comprises a first permanent magnet and a second permanent magnet,
wherein the first permanent magnet has a first overhang part that is in contact with a first end part of the second permanent magnet in an axial direction of the rotary shaft, and is supported by the rotary shaft,
wherein the second permanent magnet has a plurality of pillar parts arranged at intervals in a circumferential direction of the rotor and supported by the first permanent magnet on an outer side of the first permanent magnet,
wherein the first overhang part and the first end part are joined to each other.

17. The rotor according to claim 16 , wherein the second permanent magnet has a connection part that connects the plurality of pillar parts adjoining in the circumferential direction.

18. The rotor according to claim 17 , wherein the connection part is arranged between the first end part of the second permanent magnet in the axial direction and a second end part on a side opposite to the first end part.

19. The rotor according to claim 16 , wherein the first permanent magnet is a ferrite bond magnet, and
wherein the second permanent magnet is a rare-earth bond magnet.

20. The rotor according to claim 1 , wherein the rotor has 2n magnetic poles (n: natural number greater than or equal to 1), and
wherein the first permanent magnet and the second permanent magnet forming an outer peripheral surface of the rotor body have polar anisotropy and differ from each other in magnetic pole strength.

21. A motor comprising:
the rotor according to claim 1 ; and
a stator.

22. A blower comprising:
the motor according to claim 21 ; and
an impeller that is driven by the motor.

23. An air conditioner comprising:
an indoor unit; and
an outdoor unit connected to the indoor unit,
wherein at least one of the indoor unit and the outdoor unit comprises the motor according to

Assignees

• Mitsubishi Electric Corp

Inventors

• Watanabe Takanori
• Aso Hiroki

Classifications

• H02K15/03

  having permanent magnets · CPC title

• F24F13/00

  Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02K21/16

  having annular armature cores with salient poles (with homopolar co-operation H02K21/20) · CPC title

• H02K1/30

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