Stator of motor

• US 20060055275A1
• Filed: 08/15/2005
• Published: 03/16/2006
• Est. Priority Date: 08/25/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jin Soo, Shim, Jang Ho, Kim, Byung Taek
• Granted Patent: US 7,372,184 B2
• Time in Patent Office: Days
• US Class Current: 310/216.41
• CPC Class Codes: H02K 1/02 characterised by the magnetic material
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20

Abstract

A stator of a motor having various shapes and capable of minimizing the manufacturing costs. At least teeth are manufactured by the iron powder metallurgy method. In order to obtain the overhang effect, the height of a tip of each tooth is lower than the height of a rotor and the height of a yoke is higher than the height of a tip of each tooth so as to minimize the core loss of the yoke. Since, in order to minimize the end coil, the height of a neck of each tooth is gradually higher as running from the sides to the central portion in the circumferential direction, costs for manufacturing a motor can be minimized and sufficient efficiency can be obtained.

Claims

1. A stator of a motor comprising:

a plurality of teeth spaced apart from each other along the circumference of a rotor;

a yoke for connecting the teeth to each other; and

coils wound around the teeth;

wherein the height of a tip of each tooth facing the rotor is lower than the height of the rotor, and the height of the yoke is higher than the height of the tip of each tooth.

2. The stator of a motor as set forth in claim 1, wherein each tooth has a neck, between the tip of each tooth and the yoke, around which the coil is wound, and

the height of the neck of each tooth is gradually increased from the sides thereof to the central portion thereof in the circumferential direction.

3. The stator of a motor as set forth in claim 2, wherein the height of the neck of each tooth is lower than that of the tip of each tooth.

4. The stator of a motor as set forth in claim 1, wherein the teeth and the yoke are integrated with each other by the iron powder metallurgy method.

5. The stator of a motor as set forth in claim 4, wherein each tooth has a neck, between the tip of each tooth and the yoke, around which the coil is wound, and

the height of the neck of each tooth is gradually increased from the sides thereof to the central portion thereof in the circumferential direction.

6. The stator of a motor as set forth in claim 5, wherein the height of the neck of each tooth is lower than the height of the tip of each tooth.

7. A stator of a motor comprising:

a plurality of teeth spaced apart from each other along the circumference of a rotor;

a yoke for connecting the teeth to each other; and

coils wound around the teeth;

wherein the height of a tip of each tooth facing the rotor is lower than the height of the rotor, the height of the yoke is higher than the height of the tip of each tooth, and the teeth and the yoke are made of different materials.

8. The stator of a motor as set forth in claim 7, wherein the teeth are manufactured by the iron powder metallurgy method, and

the yoke is manufactured from an electrical steel sheet by the spiral method.

9. The stator of a motor as set forth in claim 8, wherein each tooth has a connector inserted into a connector recess formed on the inner wall of the yoke in the vertical direction.

10. The stator of a motor as set forth in claim 9, wherein the circumferential widths of the connector of each tooth and the connector recess of the yoke are gradually widened toward the yoke so as to prevent the separation in the radial direction.

11. The stator of a motor as set forth in claim 9, wherein the height of each tooth is equal to or greater than the height of the tip of each tooth, but not higher than the height of the yoke.

12. The stator of a motor as set forth in claim 8, wherein each tooth has a neck, provided between the tip of each tooth and the yoke, around which the coils are wound, and

the height of the neck of each tooth is gradually higher from the sides thereof to the central portion thereof.

13. The stator of a motor as set forth in claim 12, wherein the height of the neck of each tooth is lower than the height of the tip of each tooth.

14. The stator of a motor as set forth in claim 8, wherein the teeth and the yoke are coupled to each other in the vertical direction by fitting.

15. A stator of a motor comprising:

a plurality of teeth spaced apart from each other along the circumference of a rotor;

a yoke for connecting the teeth to each other; and

coils wound around the teeth;

wherein each tooth includes a tip facing the rotor and having the height lower than those of the rotor and the yoke, a connector coupled with the yoke, and a neck, disposed between the connector and the tip and gradually higher from the sides thereof in the circumferential direction to the central portion thereof, around which each coil wound.

16. The stator of a motor as set forth in claim 15, wherein the teeth are manufactured by the iron powder metallurgy method, and

the yoke is manufactured from an electrical steel sheet by the spiral method.

17. The stator of a motor as set forth in claim 16, wherein the connector of each tooth is inserted into a connector recess formed on the inner wall of the yoke in the vertical direction.

18. The stator of a motor as set forth in claim 17, wherein the circumferential widths of the connector of each tooth and the connector recess of the yoke are gradually widened toward the yoke so as to prevent the separation in the radial direction.

19. The stator of a motor as set forth in claim 16, wherein the height of the connector of each tooth is equal to or greater than the height of the tip of each tooth, but not higher than the height of the yoke.

20. The stator of a motor as set forth in claim 16, wherein the height of the neck of each tooth is lower than the height of the tip of each tooth.