Compressor motor and method for magnetizing rotor thereof

Patent metadata

Field	Value
Publication number	US-10547221-B2
Application number	US-201715473028-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Apr 5, 2016
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A compressor motor and a method for magnetizing a rotor thereof are provided. The compressor motor includes a stator and a rotor configured to electromagnetically interact with the stator to be rotated, wherein the rotor includes a core, a plurality of magnets inserted into the core, and a cover configured to cover both end portions of the core and to be injection-molded so as to fill accommodation spaces that are formed between the core and the plurality of magnets.

First claim

What is claimed is:

1. A compressor motor comprising:
a stator; and
a rotor configured to electromagnetically interact with the stator and rotate,
wherein the rotor includes:
a core having upper and lower end portions and a plurality of insertion holes formed within the core between the upper and lower end portions of the core;
a plurality of magnets respectively inserted into the plurality of insertion holes of the core to form accommodation spaces between the core and the inserted plurality of magnets; and
at least one injection-molded cover injection-molded to the core that fills the accommodation spaces and covers both of the upper and lower end portions of the core,
wherein the at least one injection molded cover comprises rotation prevention guides integrally injection-molded with the at least one injection molded cover.

2. The compressor motor as claimed in claim 1 , wherein the accommodation spaces are provided between an upper or lower end portion of the plurality of magnets and the plurality of insertion holes of the core into which the plurality of magnets are respectively inserted.

3. The compressor motor as claimed in claim 2 , wherein the at least one injection molded cover comprises extension portions that fill the accommodation spaces.

4. The compressor motor as claimed in claim 3 , wherein the extension portions have cross sections that are in a triangle shape.

5. The compressor motor as claimed in claim 2 , wherein the accommodation spaces are formed along edges of at least one of the upper or lower end portions of the plurality of magnets.

6. The compressor motor as claimed in claim 1 , wherein the accommodation spaces are provided between inclined surfaces that are formed along edges of at least one of upper or lower end portions of each magnet of the plurality of magnets and inner peripheries of the plurality of insertion holes of the core into which the respective magnets are respectively inserted.

7. The compressor motor as claimed in claim 6 , wherein the inclined surfaces are formed on at least parts of the edges of the upper or lower end portions of each magnet of the plurality of magnets.

8. The compressor motor as claimed in claim 6 , wherein the inclined surfaces are formed to be downwardly inclined in an outside direction of each magnet of the plurality of magnets.

9. The compressor motor as claimed in claim 1 , wherein each magnet of the plurality of magnets is in “C” shape in which one surface thereof convexly projects toward a center of the core.

10. The compressor motor as claimed in claim 1 , wherein the rotation prevention guides prevent the rotor from being rotated while the plurality of magnets are magnetized.

11. The compressor motor as claimed in claim 10 , wherein the rotation prevention guides comprise a plurality of projections that symmetrically project about a center of the core.

12. A method for magnetizing a rotor of a compressor motor as claimed in claim 10 , comprising:
fixing the rotor into a magnetization position by making a fixing jig come in close contact with the rotation prevention guides;
inserting the rotor into a magnetization yoke by moving the magnetization yoke in a direction of the fixed rotor that is fixed into the magnetization position; and
magnetizing the plurality of magnets included in the fixed rotor through application of a magnetization power to the magnetization yoke.

13. The method as claimed in claim 12 , wherein the fixing jig continuously supports the rotation prevention guides during the magnetization.

14. A compressor motor comprising:
a stator; and
a rotor configured to electromagnetically interact with the stator and rotate,
wherein the rotor includes:
a core having upper and lower end portions and a plurality of insertion holes formed within the core between the upper and lower end portions of the core;
a plurality of magnets having inclined surfaces that are formed along edges of upper and lower end portions of magnets of the plurality of magnets, the plurality of magnets respectively inserted into the plurality of insertion holes to form accommodation spaces between inner peripheries of the plurality of insertion holes and the inclined surfaces of the plurality of magnets;
a first injection molded cover and a second injection-molded cover that cover both of the upper and lower end portions of the core, at least one of the first injection molded cover and second injection-molded covers being injection-molded to the core to fill the accommodation spaces to form extension portions integrally formed with the at least one of the first injection molded cover and the second injection molded cover filling the accommodation spaces,

wherein the second injection molded cover comprises rotation prevention guides that are integrally injection-molded with the second injection molded cover.

15. The compressor motor as claimed in claim 14 , wherein the inclined surfaces are formed to downwardly incline in an outside direction of each magnet of the plurality of magnets.

16. The compressor motor as claimed in claim 14 , wherein each magnet of the plurality of magnets is in “C” shape in which one surface thereof convexly projects toward a center of the core.

17. The compressor motor as claimed in claim 14 , wherein the rotation prevention guides fix the rotor thereto when the magnets are magnetized.

18. The compressor motor as claimed in claim 14 , wherein the rotation prevention guides locate the rotor in a magnetization position.

19. The compressor motor as claimed in claim 14 , wherein the rotation prevention guides are symmetrically formed about a center of the core.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Dong-Bum
• Kim Gyeong-Don
• Ryu Young-Ju
• Choi Jong-Hyun
• Hwang In-Cheol

Classifications

• H02K1/2706 Primary

  Inner rotors · CPC title

• H02K15/03

  having permanent magnets · CPC title

• H02K1/2766 Primary

  having a flux concentration effect · CPC title