EP-4738659-A1 - OUTER ROTOR AND COMPRESSOR HAVING SAME

Abstract

An outer rotor for a compressor includes a core formed in a hollow cylindrical shape, a plurality of permanent magnets disposed on an inner circumferential surface of the core, a roof disposed to cover one end of the core and including a bush hole formed at a center of the roof, and a bush disposed in the bush hole of the roof. The core and the bush are made of a metal material, and the roof is made of a resin material. The roof includes at least one inner notch formed on an inner circumferential surface of the bush hole and at least one outer notch formed on an outer circumferential surface of the roof.

Inventors

• KIM, JONGGUN
• HWANG, Incheol
• PARK, JUNGWOO

Assignees

• Samsung Electronics Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240801

Claims (15)

1. An outer rotor for a compressor comprising: a core formed in a hollow cylindrical shape; a plurality of permanent magnets disposed on an inner circumferential surface of the core; a roof disposed to cover one end of the core and including a bush hole formed at a center of the roof; and a bush disposed in the bush hole of the roof, wherein the core and the bush are made of a metal material, and the roof is made of a resin material, and wherein the roof includes: at least one inner notch formed on an inner circumferential surface of the bush hole; and at least one outer notch formed on an outer circumferential surface of the roof.
2. The outer rotor of a compressor of claim 1, wherein the at least one outer notch is formed to expose a portion of the core and the plurality of permanent magnets.
3. The outer rotor of a compressor of claim 2, wherein the at least one outer notch is formed in a channel shape and has a width of at least 1.0 mm.
4. The outer rotor of a compressor of claim 1, wherein the at least one inner notch is formed to expose a portion of the bush.
5. The outer rotor of a compressor of claim 4, wherein the at least one inner notch is formed in a channel shape and has a width of at least 0.2 mm.
6. The outer rotor of a compressor of claim 1, wherein the at least one inner notch includes three inner notches.
7. The outer rotor of a compressor of claim 1, wherein the at least one outer notch includes three outer notches.
8. The outer rotor of a compressor of claim 1, wherein the core includes a plurality of magnet supports formed at regular intervals on an inner circumferential surface, wherein each of the plurality of magnet supports includes a through hole formed in a longitudinal direction of the core, and wherein the roof further comprises: a plurality of extension parts extending from one surface of the roof in contact with the core and passing through holes of the plurality of magnet supports; and a support ring having a ring shape and disposed at lower ends of the plurality of extension parts to cover another end of the core and other ends of the plurality of permanent magnets.
9. The outer rotor of a compressor of claim 1, wherein the core and the bush are made of steel, and the roof is made of polybutylene teleptite PBT.
10. The outer rotor of a compressor of claim 1, wherein the roof includes a plurality of assembly holes formed adjacent to an edge thereof.
11. A compressor comprising: a casing; an outer rotor rotatably disposed inside the casing; and a stator disposed inside the outer rotor, wherein the outer rotor comprises: a core formed in a hollow cylindrical shape; a plurality of permanent magnets disposed on an inner circumferential surface of the core; a roof disposed to cover one end of the core and including a bush hole formed at a center of the roof; and a bush disposed in the bush hole of the roof, wherein the core and the bush are made of a metal material, and the roof is made of a resin material, wherein the roof includes: at least one inner notch formed on an inner circumferential surface of the bush hole; and at least one outer notch formed on an outer circumferential surface of the roof.
12. The compressor of claim 11, wherein the at least one outer notch is formed to expose a portion of the core and the plurality of permanent magnets.
13. The compressor of claim 12, wherein the at least one outer notch is formed in a channel shape and has a width of at least 1.0 mm.
14. The compressor of claim 11, wherein the at least one inner notch is formed to expose a portion of the bush.
15. The compressor of claim 14, wherein the at least one inner notch is formed in a channel shape and has a width of at least 0.2 mm.

Description

[Technical Field] The disclosure relates to a compressor, and more particularly, to a compressor having an outer rotor. [Background Art] A compressor is a mechanical device that compresses incoming gas, increases the pressure of the gas, and discharges the compressed gas. The compressor may be classified into a reciprocating type compressor and a rotating type compressor according to their operating principles. The rotating type compressor may include a rotary compressor and a scroll compressor. The reciprocating type compressor may include a reciprocating compressor that converts a rotational motion of a motor into a linear reciprocating motion of a piston using a crank shaft and a connecting rod so as to suck, compress, and discharge gas. Generally, the reciprocating compressor uses an inner rotor motor to generate rotational force. However, because the inner rotor motor has a rotor disposed inside a stator, the moment of inertia of the rotor may be limited by the size of the stator. To increase the moment of inertia of the rotor, an outer rotor motor may be used in a reciprocating compressor. The outer rotor motor may include a stator and an outer rotor disposed outside the stator. [Disclosure of Invention] [Technical Solution] Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a compressor having an outer rotor. Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. In accordance with an aspect of the disclosure, an outer rotor for a compressor is provided. The outer rotor includes a core formed in a hollow cylindrical shape, a plurality of permanent magnets disposed on an inner circumferential surface of the core, a roof disposed to cover one end of the core and including a bush hole formed at a center of the roof, and a bush disposed in the bush hole of the roof, wherein the core and the bush is made of a metal material, and the roof is made of a resin material, and wherein the roof includes at least one inner notch formed on an inner circumferential surface of the bush hole, and at least one outer notch formed on an outer circumferential surface of the roof. According to one or more embodiments of the disclosure, the at least one outer notch may be formed to expose a portion of the core and the plurality of permanent magnets. According to one or more embodiments of the disclosure, the at least one outer notch may be formed in a channel shape. The at least one outer notch may have a width of at least 1.0 mm. According to one or more embodiments of the disclosure, the at least one inner notch may be formed to expose a portion of the bush. According to one or more embodiments of the disclosure, the at least one inner notch may be formed in a channel shape. The at least one inner notch may have a width of at least 0.2 mm. According to one or more embodiments of the disclosure, the at least one inner notch may include three inner notches. According to one or more embodiments of the disclosure, the at least one outer notch may include three outer notches. In accordance with another aspect of the disclosure, a core is provided. The core includes a plurality of magnet supports formed at regular intervals on an inner circumferential surface, wherein each of the plurality of magnet supports includes a through hole formed in a longitudinal direction of the core, and wherein the roof further includes a plurality of extension parts extending from one surface of the roof in contact with the core and passing through holes of the plurality of magnet supports, and a support ring having a ring shape and disposed at lower ends of the plurality of extension parts to cover another end of the core and other ends of the plurality of permanent magnets. According to one or more embodiments of the disclosure, the core and the bush may be made of steel. The roof may be made of polybutylene teleptite PBT. According to one or more embodiments of the disclosure, the roof may include a plurality of assembly holes formed adjacent to an edge thereof. In accordance with another aspect of the disclosure, a compressor is provided. The compressor includes a casing, an outer rotor rotatably disposed inside the casing, and a stator disposed inside the outer rotor, wherein the outer rotor includes a core formed in a hollow cylindrical shape, a plurality of permanent magnets disposed on an inner circumferential surface of the core, a roof disposed to cover one end of the core and including a bush hole formed at a center of the roof, and a bush disposed in the bush hole of the roof, wherein the core and the bush is made of a metal material, and the roof is made of a resin material, and wherein the roof includes at least one inner notch formed on an in