阅读说明：本技术 定子、电动机、压缩机、制冷空调装置及定子的制造方法 (Stator, motor, compressor, refrigeration and air-conditioning device, and method for manufacturing stator ) 是由 广泽勇二 仁吾昌弘 于 2017-05-10 设计创作，主要内容包括：定子(2)具有磁轭部(21a)和位于径向上的磁轭部(21a)的内侧的齿部(22a)。齿部(22a)的径向上的内侧表面(222)的断裂面比例小于磁轭部(21a)的侧面(211)的断裂面比例。(The stator (2) has a yoke part (21a) and a tooth part (22a) located on the inner side of the yoke part (21a) in the radial direction. The ratio of the fracture surface of the radially inner side surface (222) of the tooth (22a) is smaller than the ratio of the fracture surface of the side surface (211) of the yoke (21 a).)

1. A stator is provided with:

a yoke portion; and

a tooth portion located inside the yoke portion in a radial direction,

a ratio of a fracture surface of the radially inner side surface of the tooth portion is smaller than a ratio of a fracture surface of a side surface of the yoke portion.

2. The stator according to claim 1,

the dislocation density of the inner side surface of the tooth portion is smaller than the dislocation density of the side surface of the yoke portion.

3. The stator according to claim 1 or 2,

the inside surfaces of the teeth are formed by etched surfaces.

4. The stator according to any one of claims 1 to 3,

the tooth portion has a silicon concentration higher than that of the yoke portion.

5. The stator according to any one of claims 1 to 4,

the tooth portion has a Vickers hardness higher than that of the yoke portion.

6. The stator according to any one of claims 1 to 5,

the yoke portion has a first sheet of material,

the teeth have a second sheet.

7. The stator according to claim 6,

the second sheet is attached to the radially inner end of the first sheet.

8. The stator according to claim 6 or 7,

the first sheet and the second sheet are made of different materials.

9. The stator according to any one of claims 6 to 8,

the first sheet is an electromagnetic steel sheet.

10. The stator according to any one of claims 6 to 9,

the second sheet is an amorphous material.

11. The stator according to any one of claims 6 to 10,

the first sheet has a thickness of 0.20mm to 0.50 mm.

12. The stator according to any one of claims 6 to 11,

the second sheet has a thickness of 10 to 100 μm.

13. The stator according to any one of claims 6 to 12,

the yoke portion is formed by press working.

14. The stator according to any one of claims 1 to 13,

at least a part of the inner surface of the tooth portion is a surface formed by etching.

15. An electric motor, comprising:

a stator; and

a rotor disposed inside the stator,

the stator has:

a yoke portion formed from at least one first sheet; and

a tooth portion formed by at least one second sheet on an inner side of the yoke portion in a radial direction,

a ratio of fracture surfaces of the radially inner side surfaces of the tooth portions is smaller than a ratio of fracture surfaces of the radially outer side surfaces of the yoke portions.

16. The motor according to claim 15, wherein,

the rotor has:

a magnet insertion hole;

a permanent magnet inserted into the magnet insertion hole; and

a slit formed outside the magnet insertion hole in the radial direction.

17. The motor according to claim 16, wherein,

the permanent magnet is magnetized in the radial direction.

18. A compressor is provided with:

an electric motor;

a compression mechanism driven by the motor; and

a housing covering the motor and the compression mechanism,

the motor has:

a stator; and

a rotor disposed inside the stator,

the stator has:

a yoke portion formed from at least one first sheet; and

a tooth portion formed by at least one second sheet on an inner side of the yoke portion in a radial direction,

a ratio of a fracture surface of the radially inner side surface of the tooth portion is smaller than a ratio of a fracture surface of a side surface of the yoke portion.

19. The compressor of claim 18,

the stator is fixed in the housing by one of press-fitting and thermal press-fitting.

20. A refrigeration and air-conditioning apparatus is provided with:

an indoor unit; and

an outdoor unit connected to the indoor unit,

at least one of the indoor unit and the outdoor unit has a motor,

the motor has:

a stator; and

a rotor disposed inside the stator,

the stator has:

a yoke portion formed from at least one first sheet; and

a tooth portion formed by at least one second sheet on an inner side of the yoke portion in a radial direction,

a ratio of a fracture surface of the radially inner side surface of the tooth portion is smaller than a ratio of a fracture surface of a side surface of the yoke portion.

21. A method of manufacturing a stator having a yoke portion and a tooth portion located radially inside the yoke portion, the method comprising:

forming a plurality of sheets into the shape of the yoke portion and the tooth portion;

a step of stacking the plurality of sheets; and

forming at least a part of the radially inner surface of the tooth portion by etching so that a ratio of a fracture surface of the inner surface is smaller than a ratio of a fracture surface of a side surface of the yoke portion.

22. A method of manufacturing a stator having a yoke portion and a tooth portion located radially inside the yoke portion, the method comprising:

a step of forming a plurality of sheets into the shape of the yoke portion by press working;

forming the plurality of sheets into the shape of the teeth;

a step of stacking the plurality of sheets; and

forming at least a part of the radially inner surface of the tooth portion by etching so that a ratio of a fracture surface of the inner surface is smaller than a ratio of a fracture surface of a side surface of the yoke portion.

Technical Field

The present invention relates to a stator for a motor.

Background

Generally, an electric motor such as a permanent magnet embedded motor including a rotor and a stator is used. In the permanent magnet embedded motor, magnetic flux from the rotor flows into the tips of the teeth in the radial direction to form a magnetic path. Therefore, the contribution rate of the teeth to the efficiency of the motor is higher than that of the yoke. The stator is formed by laminating a plurality of sheets such as electromagnetic steel sheets in the axial direction of the rotating shaft of the rotor. Generally, a sheet such as an electromagnetic steel sheet is formed by press working (specifically, punching working) from the viewpoint of ease of working and cost (for example, see patent document 1).

Prior art documents

Patent document

Patent document 1: japanese patent laid-open No. 2008-228442

Disclosure of Invention

Problems to be solved by the invention

However, in the case of forming a sheet by press working, the contour of the sheet becomes a fracture surface. In this case, shear stress due to press working is generated in the fracture surface, and thus the magnetic properties of the sheet are deteriorated. In the stator, the contribution rate of the efficiency of the motor is higher particularly in the tooth portion than in the yoke portion. Therefore, in order to improve the efficiency of the motor, it is desirable to improve the magnetic characteristics of the teeth.

The invention aims to improve the efficiency of a motor.

Means for solving the problems

The stator of the present invention includes a yoke and a tooth portion located inside the yoke in a radial direction, and a ratio of a fracture surface of an inner surface of the tooth portion in the radial direction is smaller than a ratio of a fracture surface of a side surface of the yoke.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the efficiency of the motor can be improved.

Drawings

Fig. 1 is a cross-sectional view schematically showing the internal structure of a motor including a stator according to embodiment 1 of the present invention.

Fig. 2 is a plan view schematically showing the structure of the stator core.

Fig. 3 is a sectional view schematically showing the structure of the divided iron core portion.

Fig. 4 is a plan view schematically showing the structure of the divided stator core.

Fig. 5 is a perspective view schematically showing the structure of the divided stator core.

Fig. 6 is a diagram showing another example of the divided stator core.

Fig. 7 is a sectional view schematically showing the structure of the rotor.

Fig. 8 is a flowchart showing an example of a stator manufacturing process.

Fig. 9 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 1.

Fig. 10 is a perspective view schematically showing the structure of a stator core segment of a stator according to modification 1.

Fig. 11 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 2.

Fig. 12 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 3.

Fig. 13 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 4.

Fig. 14 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 5.

Fig. 15 is a plan view schematically showing the structure of a stator core segment of a stator according to modification 6.

Fig. 16 is a sectional view schematically showing the structure of a compressor according to embodiment 2 of the present invention.

Fig. 17 is a diagram schematically showing the configuration of a refrigerating and air-conditioning apparatus according to embodiment 3 of the present invention.

Detailed Description