WO2021124501A1

WO2021124501A1 - Stator, motor, compressor, and air conditioning device

Info

Publication number: WO2021124501A1
Application number: PCT/JP2019/049750
Authority: WO
Inventors: 勇二廣澤; 昌弘仁吾
Original assignee: 三菱電機株式会社
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2021-06-24
Also published as: JPWO2021124501A1; JP7285961B2

Abstract

This stator for a motor assembled in a shell has a stator core having a first core section and a second core section in the axial direction thereof. The first core section faces the shell with a gap therebetween, and the second core section is in contact with the shell. The first core section has first steel plates stacked in the axial direction and fixed by caulking sections. The second core section has second steel plates stacked in the axial direction and fixed by caulking sections. The number of caulking sections per at least one second steel plate is smaller than the number of caulking sections per at least one first steel plate.

Description

Stator, motor, compressor and air conditioner

The present invention relates to a stator, a motor, a compressor and an air conditioner.

The stator of the motor is equipped with a stator core in which steel plates are laminated. The stator core is generally fixed inside a shell of a compressor or the like (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-151648 (see FIG. 1)

In order to firmly fix the stator core to the shell, it is necessary to fix the stator core to the shell by shrink fitting or press fitting. On the other hand, when the stator core is fixed to the shell by shrink fitting or press fitting, the magnetic characteristics of the stator core may change due to the compressive stress received from the shell, and the iron loss may increase.

The present invention has been made to solve the above problems, and an object of the present invention is to firmly fix the stator core to the shell and reduce iron loss.

The stator according to one aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The number of caulked portions per sheet of at least one second steel sheet is smaller than the number of caulked portions per sheet of at least one first steel sheet.

The stator according to another aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The total area of the crimped portion per sheet of the at least one second steel sheet is smaller than the total area of the crimped portion per sheet of the at least one first steel sheet.

The stator according to still another aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The depth of the crimped portion of at least one second steel plate is shallower than the depth of the crimped portion of at least one first steel plate.

The stator according to another aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The angle formed by the side surface of the crimped portion of at least one second steel plate and the axis is larger than the angle formed by the side surface of the crimped portion of at least one first steel plate and the axis.

The stator according to another aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The crimped portion of at least one second steel plate has a rectangular shape in a plane orthogonal to the direction of the axis. The crimped portion of at least one first steel sheet has a circular shape in a plane orthogonal to the direction of the axis.

The stator according to another aspect of the present invention is a stator of an electric motor incorporated in a shell, and has a stator core having a first core portion and a second core portion in the direction of the axis. The first core portion faces the shell at intervals, and the second core portion abuts on the shell. The first core portion has a first steel plate laminated in the axial direction and fixed by a caulking portion. The second core portion has a second steel plate laminated in the direction of the axis and fixed by the caulking portion. The load required to peel off the second steel plate is smaller than the load required to peel off the first steel plate.

According to the above configuration, since the first core portion does not abut on the shell, an increase in iron loss can be suppressed, and since the second core portion abuts on the shell, the stator core is firmly fixed to the shell. can do. Further, the iron loss can be further reduced by reducing the number of crimped portions in the second core portion that comes into contact with the shell.

It is a cross-sectional view which shows the electric motor and the shell of Embodiment 1. FIG. It is sectional drawing which shows the stator core of Embodiment 1. FIG. It is a perspective view (A) which shows the division core of Embodiment 1, and the perspective view (B) which shows the division core, an insulator and an insulating film. It is a vertical sectional view which shows the electric motor and the shell of Embodiment 1. FIG. It is a cross-sectional view (A) of the line segment 5A-5A shown in FIG. 4 and the cross-sectional view (B) of the line segment 5B-5B. It is a vertical sectional view which shows the electric motor of Embodiment 1. FIG. It is a figure (A) which shows the 1st steel plate of the 1st core part of Embodiment 1 and the figure (B) which shows the 2nd steel plate of a 2nd core part. It is a figure (A) which shows the 1st steel plate of the 1st core part, and the figure (B) which shows the 2nd steel plate of a 2nd core part of the 1st modification of Embodiment 1. FIG. It is a figure (A) which shows the 1st steel plate of the 1st core part, and the figure (B) which shows the 2nd steel plate of a 2nd core part of the 2nd modification of Embodiment 1. FIG. A diagram (A) showing a first steel plate of the first core portion of the second embodiment, a diagram (B) showing a second steel plate of the second core portion, and an area for explaining the area of each caulked portion. It is a schematic diagram (C). The figure (A) which shows the 1st steel plate of the 1st core part of the modification of Embodiment 2, the figure (B) which shows the 2nd steel plate of the 2nd core part, and the area of each caulking part are explained. It is a schematic diagram (C) for this. FIG. (A) showing the first steel plate of the first core portion of the first embodiment, the cross-sectional view (B) of the line segment 12B-12B shown in FIG. 12 (A), and the line shown in FIG. 12 (A). It is sectional drawing (C) in the minute 12C-12C. FIG. (A) showing the second steel plate of the second core portion of the third embodiment, the cross-sectional view (B) of the line segment 13B-13B shown in FIG. 13 (A), and the line shown in FIG. 13 (A). It is sectional drawing (C) in the minute 13C-13C. FIG. (A) showing the first steel plate of the first core portion of the first embodiment, the cross-sectional view (B) of the line segment 14B-14B shown in FIG. 14 (A), and the line shown in FIG. 14 (A). It is sectional drawing (C) in the minute 14C-14C. FIG. (A) showing the second steel plate of the second core portion of the second core portion of the fourth embodiment, the cross-sectional view (B) of the line segment 15B-15B shown in FIG. 15 (A), and the line shown in FIG. 15 (A). It is sectional drawing (C) in the minute 15C-15C. FIG. (A) showing the first steel plate of the first core portion of the first embodiment, the cross-sectional view (B) of the line segment 16B-16B shown in FIG. 16 (A), and the line shown in FIG. 16 (A). It is sectional drawing (C) in the minute 16C-16C. FIG. (A) showing the second steel plate of the second core portion of the second core portion of the fifth embodiment, the cross-sectional view (B) of the line segment 17B-17B shown in FIG. 17 (A), and the line shown in FIG. 17 (A). It is sectional drawing (C) in the minute 17C-17C. It is a figure (A) which shows the measuring method of the peeling load of the 1st core part, and the figure (B) which shows the measuring method of the peeling load of a 2nd core part. It is a schematic diagram which shows the boundary part between the 1st core part and the 2nd core part. It is a vertical cross-sectional view which shows the example which fixed the 1st core part and the 2nd core part with a fixing pin. It is a figure (A), (B) which shows the example of the split core which constitutes a stator core. It is a schematic diagram for demonstrating the joint wrap which connects two split cores. It is a vertical cross-sectional view which shows the example which provided the 2nd core part at both ends and the center part in the axial direction of a stator core. It is an enlarged view which shows an example of the cross-sectional shape of the caulking part. It is sectional drawing which shows the compressor to which the motor of each embodiment is applicable. It is a figure which shows the air conditioner provided with the compressor of FIG.

Embodiment 1.
<Motor configuration>
First, the electric motor 100 of the first embodiment will be described. FIG. 1 is a cross-sectional view showing the motor 100 of the first embodiment. The electric motor 100 is a permanent magnet embedded motor in which a permanent magnet 55 is embedded in a rotor 5, and is used, for example, in a compressor 500 (FIG. 25).

The electric motor 100 is an electric motor called an inner rotor type, and has a rotatable rotor 5 and a stator 1 provided so as to surround the rotor 5. An air gap of, for example, 0.3 to 1.0 mm is formed between the stator 1 and the rotor 5. The electric motor 100 is incorporated inside the shell 40 of the compressor 500.

Hereinafter, the direction of the axis C1 which is the rotation axis of the rotor 5 is referred to as "axial direction". The circumferential direction around the axis C1 (indicated by the arrow R in FIG. 1) is referred to as a "circumferential direction". The radial direction centered on the axis C1 is referred to as a "diameter direction". A cross-sectional view on a plane orthogonal to the axis C1 is referred to as a "cross-sectional view", and a cross-sectional view on a plane parallel to the axis C1 is referred to as a "vertical cross-sectional view".

<Rotor configuration>
The rotor 5 has a cylindrical rotor core 50, a permanent magnet 55 attached to the rotor core 50, and a shaft 60 fixed to a central portion of the rotor core 50. The shaft 60 is, for example, the shaft of the compressor 500 (FIG. 25).

The rotor core 50 is made by laminating electromagnetic steel sheets in the axial direction and integrating them by a caulking portion. The thickness of the electromagnetic steel sheet is, for example, 0.1 to 0.7 mm, and here it is 0.35 mm. A shaft hole 54 is formed at the radial center of the rotor core 50, and the shaft 60 described above is fixed to the shaft hole 54.

Along the outer circumference of the rotor core 50, a plurality of magnet insertion holes 51 into which the permanent magnets 55 are inserted are formed. Each magnet insertion hole 51 is formed from one end to the other end in the axial direction of the rotor core 50. Each magnet insertion hole 51 corresponds to one magnetic pole. The number of magnet insertion holes 51 here is 6, so the number of magnetic poles is 6. However, the number of magnetic poles is not limited to 6, and may be 2 or more.

The magnet insertion hole 51 extends linearly on a plane orthogonal to the axis C1. One permanent magnet 55 is arranged in each magnet insertion hole 51. The permanent magnets 55 arranged in the adjacent magnet insertion holes 51 are magnetized so that the opposite poles face outward in the radial direction.

The magnet insertion hole 51 may have a V-shape whose circumferential center protrudes inward in the radial direction. Further, two or more permanent magnets 55 may be arranged in each magnet insertion hole 51.

The permanent magnet 55 is a flat plate-shaped member that is long in the axial direction and has a thickness in the radial direction of the rotor core 50. The thickness of the permanent magnet 55 is, for example, 2 mm. The permanent magnet 55 is composed of, for example, a rare earth magnet containing neodymium (Nd), iron (Fe) and boron (B). The permanent magnet 55 is magnetized in the thickness direction.

Rare earth magnets have the property that the coercive force decreases as the temperature rises, and the rate of decrease is -0.5 to -0.6% / K. A coercive force of 1100 to 1500 A / m is required to prevent demagnetization of the rare earth magnet when the maximum load assumed by the compressor is generated. In order to secure this coercive force at an atmospheric temperature of 150 ° C., it is necessary that the coercive force at room temperature (20 ° C.) is 1800 to 2300 A / m.

Therefore, dysprosium (Dy) may be added to the rare earth magnet. The coercive force of the rare earth magnet at room temperature is 1800 A / m in the state where Dy is not added, and becomes 2300 A / m by adding 2% by weight of Dy. However, the addition of Dy causes an increase in manufacturing cost and a decrease in residual magnetic flux density. Therefore, it is desirable to reduce the amount of Dy added as much as possible or not to add Dy.

A flux barrier 52 as a leakage flux suppressing hole is formed at both ends of the magnet insertion hole 51 in the circumferential direction. The core portion between the flux barrier 52 and the outer circumference of the rotor core 50 is a thin portion in order to suppress a short circuit of magnetic flux between adjacent magnetic poles. It is desirable that the thickness of the thin portion is the same as the thickness of the electromagnetic steel plate of the rotor core 50.

A slit 53 is formed on the radial outer side of the magnet insertion hole 51. The slit 53 is for smoothing the distribution of the magnetic flux from the permanent magnet 55 toward the stator 1 and suppressing torque ripple. The number, arrangement and shape of the slits 53 are arbitrary. The rotor core 50 does not necessarily have to have the slit 53.

Holes

57 and 58 serving as a passage for the refrigerant of the compressor 500 (FIG. 25) are formed inside the magnet insertion hole 51 in the radial direction. The hole 57 is formed at a position corresponding to the poles, and the hole 58 is formed at a position corresponding to the center of the pole. However, the arrangement of the

holes

57 and 58 can be changed as appropriate. Further, the rotor core 50 does not necessarily have

holes

57 and 58.

<Constituent configuration>
The stator 1 has a stator core 10, an insulator 20 and an insulating film 25 attached to the stator core 10, and a coil 3 wound around the stator core 10 via the insulator 20 and the insulating film 25.

FIG. 2 is a cross-sectional view showing the stator core 10. The stator core 10 is formed by laminating electromagnetic steel sheets in the axial direction and integrally fixing them by a caulking portion 15. The thickness of the electromagnetic steel sheet is, for example, 0.1 to 0.7 mm, and here it is 0.35 mm.

The caulking portion 15 is formed by pressing a caulking metal fitting against the surface of the electromagnetic steel sheet, and becomes a concave portion on one surface (the front surface) side of the electromagnetic steel sheet and a convex portion on the other surface (the back surface) side. ing. The details of the caulking portion 15 will be described later.

The stator core 10 has an annular yoke portion 11 centered on the axis C1 and a plurality of teeth 12 extending radially inward from the yoke portion 11. The yoke portion 11 has an outer peripheral circumference 111 and an inner peripheral circumference 112.

Teeth 12 are formed at regular intervals in the circumferential direction. The number of teeth 12 is 9 here, but it may be 2 or more. A slot 13 for accommodating the coil 3 is formed between the adjacent teeth 12.

The teeth 12 has a tooth tip portion 121 facing the rotor 5 (FIG. 1). The width of the tooth 12 in the circumferential direction is constant except for the tooth tip portion 121, and the width of the tooth tip portion 121 is wider than that. The side surface 122 of the teeth 12 and the inner circumference 112 of the yoke portion 11 face the slot 13.

A recess 18 is formed on the outer circumference 111 of the yoke portion 11. The recess 18 forms an axial refrigerant passage with the inner circumference 41 (FIG. 1) of the shell 40. The circumferential position of the recess 18 coincides with the teeth 12. The yoke portion 11 does not necessarily have to have the recess 18.

The stator core 10 has a configuration in which a plurality of divided cores 8 are connected in the circumferential direction for each tooth 12. The number of divided cores 8 is, for example, 9. These split cores 8 are joined to each other by a split surface 14 formed on the yoke portion 11.

The split cores 8 are connected to each other at a thin-walled connecting portion on the outer peripheral side of the split surface 14, or are joined to each other by welding on the split surface 14. This will be described later with reference to FIGS. 21 (A) and 21 (B).

FIG. 3A is a perspective view showing the split core 8. FIG. 3B is a perspective view showing the split core 8, the insulator 20 attached to the split core 8, and the insulating film 25. As shown in FIG. 3A, the split core 8 has a yoke portion 11 divided in the circumferential direction and teeth 12 extending radially inward from the yoke portion 11.

As shown in FIG. 3B, the insulators 20 are attached to both ends of the split core 8 in the axial direction. The insulator 20 is made of a resin such as polybutylene terephthalate (PBT).

Each insulator 20 has a wall portion 23 attached to the yoke portion 11, a body portion 22 attached to the main portion of the teeth 12, and a flange portion 21 attached to the tooth tip portion 121. A coil 3 (FIG. 1) is wound around the body portion 22, and the flange portion 21 and the wall portion 23 guide the coil 3 wound around the body portion 22 from both sides in the radial direction.

An insulating film 25 is attached to the side surface 122 of the teeth 12 and the inner circumference 112 of the yoke portion 11. The insulating film 25 is made of, for example, a resin of polyethylene terephthalate (PET). The insulator 20 and the insulating film 25 form an insulating portion that electrically insulates the stator core 10 and the coil 3.

Returning to FIG. 1, the coil 3 is composed of, for example, a magnet wire, and is wound around the teeth 12 via an insulator 20 and an insulating film 25. The wire diameter of the coil 3 is, for example, 1.0 mm. The coil 3 is wound around each tooth 12 by a concentrated winding, for example, for 80 turns. The wire diameter and the number of turns of the coil 3 are determined according to the required rotation speed, torque, applied voltage, or area of the slot 13.

FIG. 4 is a vertical cross-sectional view showing the motor 100 and the shell 40. The stator core 10 of the stator 1 is fitted inside the shell 40 by shrink fitting or press fitting. The shell 40 is a part of the closed container 507 of the compressor 500 (FIG. 25).

The stator core 10 has a first core portion 10A and a second core portion 10B in the axial direction. The first core portion 10A faces the inner circumference 41 of the shell 40 at intervals. The second core portion 10B is in contact with the inner circumference 41 of the shell 40.

That is, the outer circumference of the first core portion 10A (indicated by reference numeral 110) is formed at a position retracted radially inward from the outer circumference 111 of the second core portion 10B, and is separated from the inner circumference 41 of the shell 40. There is. The outer circumference 111 of the second core portion 10B abuts on the inner circumference 41 of the shell 40.

Here, the first core portion 10A is arranged at the center of the stator core 10 in the axial direction, and the second core portions 10B are arranged on both sides of the first core portion 10A in the axial direction. That is, the second core portion 10B is arranged at both ends in the axial direction of the stator core 10. However, the arrangement and number of the

core portions

10A and 10B are not limited to this example.

Since the first core portion 10A does not abut on the shell 40 and the second core portion 10B abuts on the shell 40, the compressive stress from the shell 40 does not act on the first core portion 10A. , Acts on the second core portion 10B.

Electrical steel sheets have the property that their magnetic properties change when they receive compressive stress, and iron loss increases. Therefore, since the first core portion 10A is not subjected to the compressive stress from the shell 40, the increase in iron loss is suppressed. Further, when the second core portion 10B comes into contact with the shell 40, the stator core 10 is firmly fixed to the shell 40.

FIG. 5A is a cross-sectional view of the line segment 5A-5A shown in FIG. 4, that is, a cross-sectional view of the first core portion 10A. FIG. 5B is a cross-sectional view of the line segment 5B-5B shown in FIG. 4, that is, a cross-sectional view of the second core portion 10B.

As shown in FIG. 5A, an annular gap G is formed between the outer circumference 110 of the first core portion 10A and the inner circumference 41 of the shell 40. On the other hand, as shown in FIG. 5 (B), the outer circumference 111 of the second core portion 10B is in contact with the inner circumference 41 of the shell 40, and the gap G as shown in FIG. 5 (A) is not formed. ..

FIG. 6 is a vertical cross-sectional view showing the motor 100. As shown in FIG. 6, the outer diameter A1 of the first core portion 10A is smaller than the outer diameter A2 of the second core portion 10B. The inner diameter of the first core portion 10A and the inner diameter of the second core portion 10B are the same as each other.

Both the first core portion 10A and the second core portion 10B are made by laminating electromagnetic steel sheets in the axial direction. The electromagnetic steel plate constituting the first core portion 10A is referred to as a first steel plate 9A, and the electromagnetic steel plate constituting the second core portion 10B is referred to as a second steel plate 9B. The first steel plate 9A and the second steel plate 9B have the same configuration as each other except for the outer diameter and the number of crimped portions 15.

FIG. 7A is a plan view showing a first steel plate 9A of the first core portion 10A. FIG. 7B is a plan view showing a second steel plate 9B of the second core portion 10B. Note that FIGS. 7A and 7B show a portion included in one divided core 8 (FIG. 2) of the first steel plate 9A and the second steel plate 9B. The same applies to FIGS. 8 (A) to 9 (B) described later.

As shown in FIG. 7A, three caulking portions 15 are formed on one first steel plate 9A for each divided core 8. Each of the crimped portions 15 has a rectangular shape in a plane orthogonal to the axial direction. A crimped portion having such a shape is referred to as a V crimped portion.

Here, the radial straight line passing through the circumferential center of the teeth 12 is referred to as the teeth center line M. The crimped portion 15 of the first steel plate 9A is formed at one location on the teeth center line M in the teeth 12 and two locations symmetrical with respect to the teeth center line M in the yoke portion 11. The crimped portion 15 formed on the teeth 12 is long in the extending direction of the teeth 12, and the crimped portion 15 formed on the yoke portion 11 is long in the extending direction of the yoke portion 11 (more specifically, the teeth center line M). Long in the direction orthogonal to).

As shown in FIG. 7B, two caulking portions 15 are formed on one second steel plate 9B for each divided core 8. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

The crimped portion 15 of the second steel plate 9B is formed at two locations symmetrical with respect to the tooth center line M in the yoke portion 11. The caulking portion 15 is long in the extending direction of the yoke portion 11 (more specifically, the direction orthogonal to the tooth center line M).

Since the stator core 10 has nine divided cores 8, when the nine divided cores 8 are totaled, one first steel plate 9A has 27 (3 × 9) caulked portions 15 (FIG. 5 (A)). )), One second steel plate 9B has 18 (2 × 9) caulked portions 15 (see FIG. 5 (B)).

As shown in FIGS. 5A and 5B, the 18 caulking portions 15 of the second steel plate 9B are the yoke portions of the 27 caulking portions 15 of the first steel plate 9A. It is arranged at a position where it overlaps with the 18 caulking portions 15 provided in 11 in the axial direction. Therefore, the caulking portion 15 of the second core portion 10B and the same number of caulking portions 15 of the first core portion 10A are engaged with each other, and the first core portion 10A and the second core portion 10B are fixed. Will be done.

The number of crimped portions 15 per sheet of the first steel plate 9A and the number of caulked portions 15 per sheet of the second steel plate 9B are not limited to the examples described here. The number of crimped portions 15 per sheet of the second steel plate 9B may be smaller than the number of crimped portions 15 per sheet of the first steel plate 9A.

Further, it is desirable that the area and shape of the crimped portion 15 of the first steel plate 9A in the plane orthogonal to the axial direction are the same as those of the crimped portion 15 of the second steel plate 9B. This is because the first core portion 10A and the second core portion 10B are more firmly fixed in this way.

<Action>
Next, the operation of the electric motor 100 of the first embodiment will be described. First, the operation of the stator core 10 being composed of the first core portion 10A that does not abut on the shell 40 and the second core portion 10B that abuts on the shell 40 will be described.

In the motor 100, the energy consumed when the magnetic flux changes inside the stator core 10 and the rotor core 50 is referred to as iron loss. Since the change in magnetic flux is small in the rotor core 50, most of the iron loss in the motor 100 is the iron loss in the stator core 10. The iron loss is represented by the sum of the hysteresis loss and the eddy current loss. The hysteresis loss is proportional to the frequency of the magnetic flux change, and the eddy current loss is proportional to the square of the frequency.

When the electromagnetic steel sheet constituting the stator core 10 receives compressive stress, its magnetic properties deteriorate and iron loss increases. The compressive stress is generated by punching of an electromagnetic steel sheet or press-fitting or shrink-fitting into a shell 40.

Press-fitting or shrink-fitting into the shell 40 is performed with a fixing force of a certain level or more in order to improve the roundness of the stator core 10 and firmly fix the stator core 10 to the shell 40. The product of the contact area between the stator core 10 and the shell 40 and the average stress acting on the area is defined as the shrink fitting load. The shrink fitting load is an index of the fixing force for fixing the stator core 10 to the shell 40.

In a configuration in which the entire outer peripheral surface of the stator core 10 is fitted to the shell 40, iron loss increases in the entire stator core 10, and as a result, motor efficiency decreases.

On the other hand, in the motor 100 of the first embodiment, the first core portion 10A of the stator core 10 does not come into contact with the shell 40 and is not subjected to compressive stress. Therefore, the increase in iron loss in the first core portion 10A hardly occurs, and the efficiency of the motor can be improved.

The effect of reducing iron loss will be explained using specific numerical examples. In an electric motor (referred to as a comparative example) in which the entire outer peripheral surface of the stator core 10 is fitted to the shell 40, the iron loss per unit volume before shrink fitting or press fitting of the stator core 10 is set to 1, and iron loss is caused by shrink fitting or press fitting. Suppose it has increased to 2.

In the electric motor 100 of the first embodiment, it is assumed that the first core portion 10A occupies 50% of the axial length of the stator core 10. In this case, the contact area between the stator core 10 and the shell 40 is half the contact area in the comparative example. Assuming that the shrink fitting load is the same as that of the comparative example, a compressive stress twice that of the comparative example acts on the second core portion 10B.

Since the first core portion 10A does not receive compressive stress from the shell 40, the iron loss per unit volume in the first core portion 10A can be considered to be 1. On the other hand, the second core portion 10B receives a compressive stress from the shell 40, and the magnitude of the compressive stress is twice that of the comparative example.

In the second core portion 10B, even if the compressive stress is doubled, the iron loss per unit volume is smaller than twice due to the saturation of the iron loss. For example, assuming that the iron loss per unit volume of the second core portion 10B is 2.4, which is 1.2 times that of the comparative example, the first core portion 10A and the second core portion 10B are respectively. The average iron loss per unit volume of the stator core 10 that occupies 50% is (2.4 × 0.5) + (1 × 0.5) = 1.7. This value is smaller than the iron loss (= 2) per unit volume of the stator core 10 of the comparative example. From this, it can be seen that the motor 100 of the first embodiment has the effect of reducing iron loss.

Therefore, according to the first embodiment, it is possible to suppress an increase in iron loss while firmly fixing the stator core 10 to the shell 40. In other words, the iron loss in the stator core 10 can be reduced by utilizing the saturation of the iron loss due to the stress concentration on the second core portion 10B.

Next, the effect of reducing the number of caulking portions 15 of the first core portion 10A in the first steel plate 9A to the number of caulking portions 15 in the second steel plate 9B of the second core portion 10B will be described. To do.

In the stator core 10, the region where the compressive stress from the shell 40 is most concentrated is the region between the outer circumference of the stator core 10 that abuts on the shell 40 and the crimped portion 15. The higher the fastening strength of the caulked portion 15, the more easily the compressive stress is concentrated and the more iron loss is likely to increase.

Since the first core portion 10A is not fixed to the shell 40, its shape is likely to change. In particular, mutual misalignment of the first steel sheet 9A is likely to occur. On the other hand, since the second core portion 10B is fixed to the shell 40, its shape is unlikely to change.

That is, the first steel plate 9A of the first core portion 10A needs to be fixed to each other with a high fastening strength, whereas the second steel plate 9B of the second core portion 10B has a relatively low fastening strength. It may be fixed.

Therefore, in the first embodiment, the number of caulking portions 15 per sheet of the second steel plate 9B of the second core portion 10B is changed to the number of caulking portions 15 per sheet of the first steel plate 9A of the first core portion 10A. It is less than the number of parts 15.

In other words, in each of the first steel plates 9A of the first core portion 10A, the fastening strength is increased by increasing the number of caulking portions 15. On the other hand, in each of the second steel plates 9B of the second core portion 10B, by reducing the number of the crimped portions 15, it is difficult to concentrate the compressive stress and the increase in iron loss is suppressed.

As described above, the stator core 10 has a first core portion 10A that does not abut on the shell 40 and a second core portion 10B that abuts on the shell 40, and is a caulked portion per sheet of the second steel plate 9B. Since the number of 15 is smaller than the number of caulked portions 15 per sheet of the first steel plate 9A, an increase in iron loss is suppressed to improve motor efficiency, and the stator core 10 is firmly fixed to the shell 40. can do.

Further, the crimped portion 15 of the second steel plate 9B is arranged so as to overlap with the crimped portion 15 of the first steel plate 9A in the same number as the crimped portion 15 in the axial direction. Therefore, the first core portion 10A and the second core portion 10B can be fixed by engaging the caulking portion 15 of the first steel plate 9A and the caulking portion 15 of the second steel plate 9B.

In particular, if the area and shape of the crimped portion 15 of the first steel plate 9A in the plane orthogonal to the axial direction are the same as the crimped portion 15 of the second steel plate 9B, the first core portion 10A and the second core portion 10A and the second The core portion 10B can be fixed more firmly.

Comparing the yoke portion 11 and the teeth 12, more magnetic flux from the rotor 5 flows through the teeth 12. Therefore, as shown in FIG. 7B, it is desirable that the caulking portion 15 is arranged in the yoke portion 11 rather than the teeth 12 in order to enhance the effect of reducing iron loss.

Here, the number of caulked portions 15 of the second steel plate 9B is 18 (two per divided core 8), and the number of caulked portions 15 of the first steel plate 9A is 27 (3 per divided core 8). However, the number is not limited to these. The number of crimped portions 15 per sheet of the second steel plate 9B may be smaller than the number of crimped portions 15 per sheet of the first steel plate 9A.

Further, here, the number of caulking portions 15 per sheet of all the second steel plates 9B of the second core portion 10B is the number of caulking portions per sheet of all the first steel plates 9A of the first steel plate 9A. Less than the number of parts 15. However, the number of caulked portions 15 per at least one second steel plate 9B of the second core portion 10B is per one of at least one first steel plate 9A of the first core portion 10A. It may be less than the number of caulking portions 15.

Further, the stator core 10 is not limited to one in which a plurality of divided cores 8 are connected in the circumferential direction (FIG. 2), and may be one in which annularly punched electromagnetic steel sheets are laminated in the axial direction.

<Effect of embodiment>
As described above, in the first embodiment, the stator core 10 has a first core portion 10A facing the shell 40 at intervals and a second core portion 10B abutting on the shell 40. The number of caulking portions 15 per sheet of at least one second steel plate 9B of the core portion 10B of 2 is the number of caulking portions per sheet of at least one first steel plate 9A of the first core portion 10A. Less than the number of 15. Therefore, the increase in iron loss in the stator core 10 can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

Further, since the second core portion 10B is located on both sides of the first core portion 10A in the axial direction, both ends of the stator core 10 in the axial direction are fitted to the shell 40. As a result, the stator core 10 can be fixed to the shell 40 in a stable state.

Further, since at least one caulking portion 15 of the second steel plate 9B is arranged at a position where it overlaps with at least one caulking portion 15 of the first steel plate 9A in the axial direction, the caulking portions 15 are engaged with each other. , The first core portion 10A and the second core portion 10B can be fixed.

Further, since the crimped portion 15 of the first steel plate 9A and the crimped portion 15 of the second steel plate 9B both have a rectangular shape in a plane orthogonal to the axial direction, the first core portion 10A and the second core portion 10A and the second The core portion 10B can be firmly fixed.

First modification.
Next, a first modification of the first embodiment will be described. FIG. 8A is a plan view showing a first steel plate 9A of the first core portion 10A of the first modification. FIG. 8B is a plan view showing a second steel plate 9B of the second core portion 10B of the first modification.

The caulked portion 15 (FIGS. 7 (A) and 7 (B)) of the first steel plate 9A of the first embodiment had a rectangular shape in a plane orthogonal to the axial direction. As shown, the crimped portion 16 of the first steel plate 9A of the first modification has a circular shape in a plane orthogonal to the axial direction. Such a caulking portion is also referred to as a round caulking portion. Similarly, as shown in FIG. 8B, the crimped portion 16 of the second steel plate 9B of the first modification has a circular shape in a plane orthogonal to the axial direction.

The stator core 10 of the first modification is configured in the same manner as the stator core 10 of the first embodiment except for the caulking portion 16.

Here, the number of crimped portions 16 per sheet of the first steel plate 9A is three for each divided core 8, and the number of caulked portions 16 per sheet of the second steel plate 9B is one divided core. The number is two per eight, but is not limited to these numbers. The number of crimped portions 16 per sheet of the second steel plate 9B may be smaller than the number of crimped portions 16 per sheet of the first steel plate 9A.

The circular caulking portion (round caulking portion) 16 in the plane orthogonal to the axial direction has a longer peripheral length of the side surface portion than the rectangular caulking portion (V caulking portion) 15 having the same area. Therefore, by using the circular caulking portion 16, higher fastening hardness can be obtained as compared with the case where the rectangular caulking portion 15 is used.

Note that the rectangular caulking portion 15 shown in FIGS. 7A and 7B and the circular caulking portion 16 shown in FIGS. 8A and 8B may be used in combination.

Second modification.
Next, a second modification of the first embodiment will be described. FIG. 9A is a plan view showing a first steel plate 9A of the first core portion 10A of the second modification. FIG. 9B is a plan view showing a second steel plate 9B of the second core portion 10B of the second modification.

As shown in FIGS. 9A and 9B, in the second modification, the first steel plate 9A of the first core portion 10A has the caulking portion 15, but the second core portion 10B is the second. The steel plate 9B of the above does not have a caulking portion 15.

As described above, since the second core portion 10B is fixed to the shell 40, the fastening strength of the second steel plate 9B of the second core portion 10B may be relatively low. Therefore, in the second modification, the caulking portion 15 is not provided on the second steel plate 9B, and the second steel plates 9B are fixed to each other by, for example, an adhesive.

In FIG. 9A, the number of caulked portions 15 per sheet of the first steel plate 9A is two for each divided core 8. However, the number of caulked portions 15 per sheet of the second steel plate 9B may be one or more. Further, FIG. 9A shows a rectangular caulking portion 15 in a plane orthogonal to the axial direction, but as shown in FIG. 8A, a circular shape is shown in a plane orthogonal to the axial direction. The caulking portion 16 of the above may be used.

The stator core 10 of the second modification is configured in the same manner as the stator core 10 of the first embodiment except for the number of caulked portions 15 in the first steel plate 9A and the second steel plate 9B.

In this second modification, since the second steel plate 9B does not have a crimped portion, the effect of reducing iron loss can be further enhanced.

Embodiment 2.
Next, the second embodiment will be described. FIG. 10A is a plan view showing a first steel plate 9A of the first core portion 10A in the stator core 10 of the second embodiment. FIG. 10B is a plan view showing a second steel plate 9B of the second core portion 10B. Note that FIGS. 10A and 10B show a portion included in one divided core 8 (FIG. 2) of the first steel plate 9A and the second steel plate 9B. The same applies to FIGS. 11A and 11B described later.

As shown in FIG. 10A, two caulking portions 15 are formed on one first steel plate 9A for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The crimped portion 15 of the first steel plate 9A has a rectangular shape in a plane orthogonal to the axial direction.

As shown in FIG. 10B, two caulking portions 15 are formed on one second steel plate 9B for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The crimped portion 15 of the second steel plate 9B has a rectangular shape in a plane orthogonal to the axial direction.

The number of crimped portions 15 per sheet of the first steel plate 9A is the same as the number of caulked portions 15 per sheet of the second steel plate 9B.

In the second embodiment, the area of each crimped portion 15 of the second steel plate 9B is smaller than the area of each crimped portion 15 of the first steel plate 9A. This point will be described below.

FIG. 10C is a schematic diagram for explaining the area of the caulked portion 15. In the electromagnetic steel plate 9 (first steel plate 9A or second steel plate 9B), the surface on the side to which the force is applied by the caulking metal fitting is the front surface 101, and the surface on the opposite side is the back surface 102.

The crimped portion 15 is a concave portion on the front surface 101 side and a convex portion on the back surface 102 side. The recess of the caulking portion 15 has a bottom surface 15a which is a plane orthogonal to the axial direction, and side surfaces 15b and 15c around the bottom surface 15a. The bottom surface 15a is rectangular. The side surface 15b extends along the short side of the bottom surface 15a, and the side surface 15c extends along the long side of the bottom surface 15a.

Assuming that the length of the long side of the bottom surface 15a of the caulking portion 15 is Lx and the length of the short side is Ly, the area S of the bottom surface 15a is represented by Lx × Ly. Here, since the caulking portion 15 is provided on the yoke portion 11, the long side of the bottom surface 15a is orthogonal to the tooth center line M. When the caulking portion 15 is provided on the teeth 12, the long side of the bottom surface 15a is parallel to the teeth center line M.

The total area of the caulked portions 15 per sheet of the first steel plate 9A is the area S1 of each caulked portion 15 multiplied by the number of caulked portions 15 per sheet of the first steel plate 9A. Similarly, the total area of the caulked portions 15 per sheet of the second steel plate 9B is obtained by multiplying the area S2 of each caulked portion 15 by the number of caulked portions 15 per sheet of the second steel plate 9B. is there.

The area S2 of each crimped portion 15 of the second steel plate 9B is smaller than the area S1 of each crimped portion 15 of the first steel plate 9A, and the first steel plate 9A and the second steel plate 9B are crimped per sheet. Since the number of portions 15 is the same, the total area of the crimped portions 15 per sheet of the second steel plate 9B is smaller than the total area of the crimped portions 15 per sheet of the first steel plate 9A.

The larger the total area of the crimped portion 15, the larger the area where the steel plates come into contact with each other on the side surfaces 15b and 15c of the crimped portion 15, and the higher the fastening strength. As described in the first embodiment, in the first core portion 10A that does not abut on the shell 40, it is necessary to increase the fastening strength of the first steel plate 9A, but the second core portion fixed to the shell 40. At 10B, the fastening strength of the second steel plate 9B may be relatively small.

In the second embodiment, since the total area of the crimped portion 15 per sheet of the second steel plate 9B is smaller than the total area of the crimped portion 15 per sheet of the first steel plate 9A, the second core It is possible to reduce the iron loss in the portion 10B and firmly fix the first steel plate 9A of the first core portion 10A.

Here, the total area of the caulked portions 15 per sheet of all the second steel plates 9B of the second core portion 10B is the caulked portion 15 per sheet of the first steel plate 9A of the first core portion 10A. Is smaller than the total area of. However, the total area of at least one second steel plate 9B of the second core portion 10B is the total area of the caulked portion 15 per one of at least one first steel plate 9A of the first core portion 10A. It should be less than.

Further, here, the number of caulked portions 15 per sheet of the first steel plate 9A and the number of caulked portions 15 per sheet of the second steel plate 9B are set to be the same, but the numbers do not necessarily have to be the same. Absent. The number of crimped portions may be different as long as the total area of the crimped portions 15 per sheet of the second steel plate 9B is smaller than the total area of the crimped portions 15 per sheet of the first steel plate 9A. For example, as in the first embodiment, the number of crimped portions 15 per sheet of the second steel plate 9B may be smaller than the number of crimped portions 15 per sheet of the first steel plate 9A.

Further, in FIGS. 10A and 10B, the caulking portion 15 is provided on the yoke portion 11, but the teeth 12 may be provided.

It is desirable that the crimped portion 15 of the first steel plate 9A and the crimped portion 15 of the second steel plate 9B are arranged at positions where they overlap in the axial direction. As a result, the first core portion 10A and the second core portion 10B can be firmly fixed.

Except for the above points, the motor of the second embodiment is configured in the same manner as the motor 100 of the first embodiment.

As described above, in the second embodiment, the stator core 10 has a first core portion 10A facing the shell 40 at intervals and a second core portion 10B abutting on the shell 40, and at least. The total area of the crimped portion 15 per sheet of the second steel plate 9B is smaller than the total area of the crimped portion 15 per sheet of the first steel plate 9A at least. Therefore, the increase in iron loss in the stator core 10 can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

Modification example.
Next, a modified example of the second embodiment will be described. FIG. 11A is a plan view showing a first steel plate 9A of the first core portion 10A in the stator core 10 of the modified example. FIG. 11B is a plan view showing a second steel plate 9B of the second core portion 10B.

As shown in FIG. 11A, two caulking portions 16 are formed on one first steel plate 9A for each divided core 8. The two caulking portions 16 are formed in the yoke portion 11. The crimped portion 16 of the first steel plate 9A has a circular shape in a plane orthogonal to the axial direction.

As shown in FIG. 11B, two caulking portions 16 are formed on one second steel plate 9B for each divided core 8. The two caulking portions 16 are formed in the yoke portion 11. The crimped portion 16 of the second steel plate 9B has a circular shape in a plane orthogonal to the axial direction.

FIG. 11C is a schematic diagram for explaining the area of the caulked portion 16. The caulked portion 16 is a concave portion on the front surface 101 side of the steel plate 9, and a convex portion on the back surface 102 side. The recess of the caulking portion 16 has a bottom surface 16a which is a plane orthogonal to the axial direction and a side surface 16b around the bottom surface 16a. The bottom surface 16a is circular, and the side surface 16b extends in a circumferential shape.

Assuming that the diameter of the bottom surface 16a of the crimped portion 16 is D, the area S of the bottom surface 16a is ^{represented by (D / 2) 2} × π.

The area S2 of each crimped portion 16 of the second steel plate 9B is smaller than the area S1 of each crimped portion 16 of the first steel plate 9A. Further, the number of caulked portions 16 per sheet of the first steel plate 9A and the number of caulked portions 16 per sheet of the second steel plate 9B are the same. Therefore, the total area of the crimped portion 16 per sheet of the second steel plate 9B is smaller than the total area of the crimped portion 16 per sheet of the first steel plate 9A.

Therefore, the iron loss in the second core portion 10B can be reduced, and the first steel plate 9A in the first core portion 10A can be firmly fixed. Since the crimped portion 16 having a circular shape in the plane orthogonal to the axial direction has a longer peripheral length of the side surface portion than the rectangular crimped portion 15 having the same area, a higher fastening hardness can be obtained.

If the total area of the crimped portion 16 per sheet of the second steel plate 9B is smaller than the total area of the crimped portion 16 per sheet of the first steel plate 9A, then each of the

steel plates

9A and 9B The number of caulking portions 16 is arbitrary.

It is desirable that the crimped portion 16 of the first steel plate 9A and the crimped portion 16 of the second steel plate 9B are arranged at positions where they overlap in the axial direction. As a result, the first core portion 10A and the second core portion 10B can be firmly fixed.

The stator core 10 of this modified example has the same configuration as the stator core 10 of the second embodiment except for the caulking portion 16.

Also in this modification, the total area of the crimped portion 16 per sheet of the second steel plate 9B is smaller than the total area of the crimped portion 16 per sheet of the first steel plate 9A, so that the iron loss increases. It can be suppressed and the stator core 10 can be firmly fixed to the shell 40.

Further, the rectangular caulking portion 15 shown in FIGS. 10A and 10B and the circular caulking portion 16 shown in FIGS. 11A and 11B may be used in combination.

Embodiment 3.
Next, the third embodiment will be described. FIG. 12A is a plan view showing the first steel plate 9A of the first core portion 10A in the stator core 10 of the third embodiment. Note that FIG. 12A shows a portion included in one divided core 8 (FIG. 2) of the first steel plate 9A.

As shown in FIG. 12A, two caulking portions 15 are formed on one first steel plate 9A for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

FIG. 12B is a cross-sectional view of the line segment 12B-12B shown in FIG. 12A, and is a cross-sectional view of the surface along the long side of the caulked portion 15. 12 (C) is a cross-sectional view of the line segment 12C-12C shown in FIG. 12 (A), and is a cross-sectional view of the plane along the short side of the caulked portion 15.

As shown in FIGS. 12B and 12C, the caulked portion 15 protrudes from the back surface 102 of the first steel plate 9A. The most protruding protruding surface 15d of the caulked portion 15 is a plane orthogonal to the axial direction. The distance from the back surface 102 of the first steel plate 9A to the protruding surface 15d of the caulked portion 15 is referred to as a depth D1.

FIG. 13A is a plan view showing a second steel plate 9B of the second core portion 10B in the stator core 10 of the third embodiment. Note that FIG. 13A shows a portion included in one divided core 8 (FIG. 2) of the second steel plate 9B.

As shown in FIG. 13A, two caulking portions 15 are formed on one second steel plate 9B for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

FIG. 13 (B) is a cross-sectional view of the line segment 13B-13B shown in FIG. 13 (A), and is a cross-sectional view of the surface along the long side of the caulked portion 15. 13 (C) is a cross-sectional view of the line segment 13C-13C shown in FIG. 13 (A), and is a cross-sectional view of the plane along the short side of the caulked portion 15.

As shown in FIGS. 13B and 13C, the caulked portion 15 protrudes from the back surface 102 of the second steel plate 9B. The most protruding protruding surface 15d of the caulked portion 15 is a plane orthogonal to the axial direction. The distance from the back surface 102 of the second steel plate 9B to the protruding surface 15d of the caulked portion 15 is referred to as a depth D2.

The depth D2 of the crimped portion 15 of the second steel plate 9B is shallower than the depth D1 of the crimped portion 15 of the first steel plate 9A.

The greater the depth of the caulking portion 15 (also referred to as the caulking depth), the greater the area in which the steel plates come into contact with each other on the side surfaces 15b and 15c of the caulking portion 15, and the higher the fastening strength. As described in the first embodiment, in the first core portion 10A that does not abut on the shell 40, it is necessary to increase the fastening strength of the first steel plate 9A, but the second core portion fixed to the shell 40. At 10B, the fastening strength of the second steel plate 9B may be relatively small.

In the third embodiment, since the depth D2 of the crimped portion 15 of the second steel plate 9B is shallower than the depth D1 of the crimped portion 15 of the first steel plate 9A (D2 <D1), the second core portion The iron loss at 10B can be reduced, and the first steel plate 9A of the first core portion 10A can be firmly fixed.

Here, the depth D2 of the crimped portions 15 of all the second steel plates 9B of the second core portion 10B is shallower than the D1 of the crimped portions 15 of all the first steel plates 9A of the first core portion 10A. .. However, the depth D2 of the crimped portion 15 of at least one second steel plate 9B of the second core portion 10B is larger than the depth D1 of the at least one first steel plate 9A of the first core portion 10A. It should be shallow.

Further, the crimped portion 15 of the first steel plate 9A and the crimped portion 15 of the second steel plate 9B have a rectangular shape in a plane orthogonal to the axial direction, as shown in FIGS. 11A to 11C. Like the crimped portion 16 shown, it may have a circular shape.

Here, the number of caulking portions 15 per sheet of the first steel plate 9A and the number of caulking portions 15 per sheet of the second steel plate 9B are the same as each other, but may be different from each other. Further, in FIGS. 12A and 13A, the caulking portion 15 is provided on the yoke portion 11, but it may be provided on the teeth 12.

It is desirable that the crimped portion 15 of the first steel plate 9A and the crimped portion 15 of the second steel plate 9B are arranged at positions where they overlap in the axial direction. Further, it is desirable that the area of each crimped portion 15 of the first steel plate 9A is the same as the area of each crimped portion 15 of the second steel plate 9B. As a result, the first core portion 10A and the second core portion 10B can be firmly fixed.

Except for the above points, the motor of the third embodiment is configured in the same manner as the motor 100 of the first embodiment.

As described above, in the third embodiment, the stator core 10 has a first core portion 10A facing the shell 40 at intervals and a second core portion 10B abutting on the shell 40, and at least. The depth D2 of the crimped portion 15 of one second steel plate 9B is shallower than the depth D1 of the crimped portion 15 of at least one first steel plate 9A. Therefore, the increase in iron loss in the stator core 10 can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

Embodiment 4.
Next, the fourth embodiment will be described. FIG. 14A is a plan view showing a first steel plate 9A of the first core portion 10A in the stator core 10 of the fourth embodiment. Note that FIG. 14A shows a portion included in one divided core 8 (FIG. 2) of the first steel plate 9A.

As shown in FIG. 14A, two caulking portions 15 are formed on one first steel plate 9A for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

FIG. 14 (B) is a cross-sectional view of the line segment 14B-14B shown in FIG. 14 (A), and is a cross-sectional view of the surface along the long side of the caulked portion 15. 14 (C) is a cross-sectional view of the line segment 14C-14C shown in FIG. 14 (A), and is a cross-sectional view of the surface of the caulked portion 15 along the short side.

As shown in FIGS. 14B and 14C, the caulked portion 15 of the first steel plate 9A has a rectangular bottom surface 15a, a side surface 15b extending along the short side of the bottom surface 15a, and the length of the bottom surface 15a. It has a side surface 15c extending along the side. In FIGS. 14B and 14C, the axial direction is indicated by a straight line N.

The angle (that is, the opening angle) formed by the two side surfaces 15b facing the long side direction of the crimped portion 15 of the first steel plate 9A is 30 to 150 degrees. The angle (that is, opening angle) formed by the two side surfaces 15c facing each other in the short side direction of the caulked portion 15 is also 30 to 150 degrees. However, the angle formed by the two side surfaces 15b (FIG. 14B) is larger than the angle formed by the two side surfaces 15c.

The angle R1 (1/2 of the opening angle) formed by the side surface 15b and the axial direction is 15 to 75 degrees. The angle r1 formed by the side surface 15c and the axial direction is also 15 to 75 degrees. However, the angle R1 formed by the side surface 15b and the axial direction is larger than the angle r1 formed by the side surface 15c and the axial direction.

The closer the side surface of the crimped portion 15 is parallel to the axial direction, the higher the fastening strength of the steel plate. On the contrary, the larger the angle formed by the side surface of the crimped portion 15 and the axial direction, the smaller the stacking direction component of the frictional force between the steel plates, and therefore the lower the fastening strength of the steel plates.

In the crimped portion 15 of the first steel plate 9A, the angle R1 formed by the side surface 15b and the axial direction is larger than the angle r1 formed by the side surface 15c and the axial direction, so that the cross section in the long side direction (FIG. 14 (B)). The fastening strength in the above is lower than the fastening strength in the cross section in the short side direction (FIG. 14 (C)).

FIG. 15A is a plan view showing a second steel plate 9B of the second core portion 10B in the stator core 10 of the fourth embodiment. Note that FIG. 15A shows a portion included in one divided core 8 (FIG. 2) of the second steel plate 9B.

As shown in FIG. 15A, two caulking portions 15 are formed on one second steel plate 9B for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

FIG. 15B is a cross-sectional view of the line segment 15B-15B shown in FIG. 15A, and is a cross-sectional view of the surface along the long side of the caulked portion 15. 15 (C) is a cross-sectional view of the line segment 15C-15C shown in FIG. 15 (A), and is a cross-sectional view of the plane along the short side of the caulked portion 15.

As shown in FIGS. 15B and 15C, the caulked portion 15 of the second steel plate 9B has a rectangular bottom surface 15a, a side surface 15b extending along the short side of the bottom surface 15a, and the length of the bottom surface 15a. It has a side surface 15c extending along the side.

The angle (that is, the opening angle) formed by the two side surfaces 15b facing the long side direction of the crimped portion 15 of the second steel plate 9B is 30 to 150 degrees. The angle formed by the two side surfaces 15c facing each other in the short side direction of the crimped portion 15 is also 30 to 150 degrees. However, the angle formed by the two side surfaces 15b is larger than the angle formed by the two side surfaces 15c.

The angle R2 (1/2 of the opening angle) formed by the side surface 15b and the axial direction is 15 to 75 degrees. The angle r2 formed by the side surface 15c and the axial direction is also 15 to 75 degrees. However, the angle R2 formed by the side surface 15b and the axial direction is larger than the angle r2 formed by the side surface 15c and the axial direction. Therefore, the fastening strength in the cross section in the long side direction (FIG. 15 (B)) is lower than the fastening strength in the cross section in the short side direction (FIG. 15 (C)).

In the fourth embodiment, the maximum angle (that is, the angle R2) formed by the side surfaces 15b and 15c of the crimped portion 15 of the second steel plate 9B and the axial direction is the side surfaces 15b and 15c of the crimped portion 15 of the first steel plate 9A. It is larger than the maximum angle (that is, the angle R1) formed by the axial direction.

Therefore, the fastening strength of the crimped portion 15 of the second steel plate 9B in the long side direction is lower than the fastening strength of the first steel plate 9A in the long side direction. As described in the first embodiment, in the first core portion 10A that does not abut on the shell 40, it is necessary to increase the fastening strength of the first steel plate 9A, but the second core portion fixed to the shell 40. At 10B, the fastening strength of the second steel plate 9B may be relatively small.

The maximum angle (angle R2) formed by the side surface of the crimped portion 15 of the second steel plate 9B and the axial direction is larger than the maximum angle (angle R1) formed by the side surface of the crimped portion 15 of the first steel plate 9A and the axial direction. Since it is large, the iron loss in the second core portion 10B can be reduced, and the first steel plate 9A in the first core portion 10A can be firmly fixed.

Since the fastening strength of the second steel plate 9B is particularly low in the longitudinal direction of the crimped portion 15, it is an issue to suppress the misalignment of the second steel plate 9B in that direction. If the longitudinal direction of the crimped portion 15 coincides with the circumferential direction of the stator core 10, compressive stress is unlikely to be applied to the second steel plate 9B in the longitudinal direction of the crimped portion 15, so that the misalignment of the second steel plate 9B is prevented. be able to.

Here, the maximum angle formed by the side surfaces 15b, 15c of the crimped portion 15 of all the second steel plates 9B of the second core portion 10B and the axial direction is the maximum angle formed by all the first steel plates 9A of the first core portion 10A. It is larger than the maximum angle formed by the side surfaces 15b and 15c of the caulked portion 15 and the axial direction. However, the maximum angle formed by the side surfaces 15b, 15c of the crimped portion 15 of the second steel plate 9B of the second core portion 10B and the axial direction is the first one of at least one of the first core portions 10A. It may be larger than the maximum angle formed by the side surfaces 15b and 15c of the crimped portion 15 of the steel plate 9A and the axial direction.

Both the crimped portion 15 of the first steel plate 9A and the crimped portion 15 of the second steel plate 9B have a rectangular shape in a plane orthogonal to the axial direction, but FIGS. 11A to 11C have a rectangular shape. It may have a circular shape like the crimped portion 16 shown in 1.

Here, the number of caulking portions 15 per sheet of the first steel plate 9A and the number of caulking portions 15 per sheet of the second steel plate 9B are the same as each other, but may be different from each other. Further, in FIGS. 14 (A) and 15 (A), the caulking portion 15 is provided on the yoke portion 11, but the teeth 12 may be provided.

Except for the above points, the motor of the fourth embodiment is configured in the same manner as the motor 100 of the first embodiment.

As described above, in the fourth embodiment, the stator core 10 has a first core portion 10A facing the shell 40 at intervals and a second core portion 10B abutting on the shell 40, and at least. The maximum angle (angle R2) formed by the side surface of the crimped portion 15 of the second steel plate 9B and the axial direction is the maximum formed by the side surface of the crimped portion 15 of the first steel plate 9A and the axial direction. It is larger than the angle (angle R1). Therefore, the increase in iron loss in the stator core 10 can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

Embodiment 5.
Next, the fifth embodiment will be described. FIG. 16A is a plan view showing a first steel plate 9A of the first core portion 10A in the stator core 10 of the fifth embodiment. Note that FIG. 16A shows a portion included in one divided core 8 (FIG. 2) of the first steel plate 9A.

As shown in FIG. 16A, two caulking portions 16 are formed on one first steel plate 9A for each divided core 8. The two caulking portions 16 are formed in the yoke portion 11. The caulking portion 16 has a circular shape in a plane orthogonal to the axial direction.

FIG. 16B is a cross-sectional view of the line segment 16B-16B shown in FIG. 16A. 16 (C) is a cross-sectional view of the line segment 16C-16C shown in FIG. 16 (A). In the case of the circular caulking portion 16, the opening angle of the side surface 16b is 0 to 30 degrees, and the angle R1 formed by the side surface 16b and the axial direction is 0 to 15 degrees.

FIG. 17A is a plan view showing a second steel plate 9B of the second core portion 10B in the stator core 10 of the fifth embodiment. Note that FIG. 15A shows a portion included in one divided core 8 (FIG. 2) of the second steel plate 9B.

As shown in FIG. 17A, two caulking portions 15 are formed on one second steel plate 9B for each divided core 8. The two caulking portions 15 are formed in the yoke portion 11. The caulking portion 15 has a rectangular shape in a plane orthogonal to the axial direction.

FIG. 17B is a cross-sectional view of the line segment 17B-17B shown in FIG. 17A, and is a cross-sectional view of the surface along the long side of the caulked portion 15. FIG. 17C is a cross-sectional view of the line segment 17C-17C shown in FIG. 17A, and is a cross-sectional view of the surface of the caulked portion 15 along the short side. As described in the fourth embodiment, the angle R2 formed by the side surface 15b and the axial direction is 15 to 75 degrees, and the angle r2 formed by the side surface 15c and the axial direction is also 15 to 75 degrees. However, the angle R2 formed by the side surface 15b and the axial direction is larger than the angle r2 formed by the side surface 15c and the axial direction.

The circular caulking portion 16 (round caulking portion) in the plane orthogonal to the axial direction is the axial direction of the side surface 15b as compared with the rectangular caulking portion 15 (V caulking portion) in the plane orthogonal to the axial direction. Since the inclination from is small, the fastening strength is high.

In the fifth embodiment, a rectangular caulking portion 15 is used for the second steel plate 9B of the second core portion 10B in a plane orthogonal to the axial direction, and the first steel plate 9A of the first core portion 10A is used. In addition, by using the circular caulking portion 16 in the plane orthogonal to the axial direction, the iron loss in the second core portion 10B is reduced, and the first steel plate 9A of the first core portion 10A is strengthened. Can be fixed to.

Here, the crimped portions 16 of all the second steel plates 9B of the second core portion 10B have a rectangular shape, and the crimped portions 15 of all the first steel plates 9A of the first core portion 10A have a circular shape. Have. However, the caulking portion 16 of at least one second steel plate 9B of the second core portion 10B has a rectangular shape, and the caulking portion 15 of at least one first steel plate 9A of the first core portion 10A has a rectangular shape. It suffices to have a circular shape.

Here, the number of caulking portions 15 per sheet of the first steel plate 9A and the number of caulking portions 15 per sheet of the second steel plate 9B are the same as each other, but may be different from each other. Further, in FIGS. 16A and 17A, the

caulking portions

15 and 16 are provided on the yoke portion 11, but may be provided on the teeth 12.

Except for the above points, the motor of the fifth embodiment is configured in the same manner as the motor 100 of the first embodiment.

As described above, in the fifth embodiment, the stator core 10 has a first core portion 10A facing the shell 40 at intervals and a second core portion 10B abutting on the shell 40, and at least. The crimped portion 15 of one second steel plate 9B has a rectangular shape in a plane orthogonal to the axial direction, and the crimped portion 15 of at least one first steel plate 9A is a circle in a plane orthogonal to the axial direction. Has a shape. Therefore, the increase in iron loss in the stator core 10 can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

<Peeling strength of steel plate>
Next, the peel strength of the first core portion 10A and the second core portion 10B will be described. FIG. 18A is a schematic view showing a method of measuring the peel strength of the first core portion 10A of the stator core 10. FIG. 18B is a schematic view showing a method of measuring the peel strength of the second core portion 10B of the stator core 10.

The peel strength is measured separately for the first core portion 10A and the second core portion 10B. Therefore, the first core portion 10A and the second core portion 10B are not incorporated in the shell 40, and the coil 3 is not wound.

As shown in FIG. 18A, both ends of the first core portion 10A in the axial direction are gripped by a pair of grip portions 61, and an axial tensile force is applied to the first core portion 10A. Let F1 be the load when the first steel plate 9A is peeled off in the first core portion 10A.

Similarly, as shown in FIG. 18B, both ends of the second core portion 10B in the axial direction are gripped by a pair of grip portions 61, and an axial tensile force is applied to the second core portion 10B. Let F2 be the load when the second steel plate 9B is peeled off in the second core portion 10B.

In the comparison of the loads F1 and F2, the number of laminated steel plates may be different between the first core portion 10A and the second core portion 10B.

The first core portion 10A and the second core portion 10B may have any of the configurations described in the first to fifth embodiments. In either case, since the fastening strength of the second steel plate 9B of the second core portion 10B is lower than the fastening strength of the first steel plate 9A of the first core portion 10A, the second steel plate 9B is peeled off. The load required for this is smaller than the load required for peeling the first steel sheet 9A.

As described above, since the load required for peeling the second steel plate 9B is smaller than the load required for peeling the first steel plate 9A, as described in the first to fifth embodiments, The increase in iron loss can be suppressed to improve the efficiency of the motor, and the stator core 10 can be firmly fixed to the shell 40.

<Boundary part between the first core part and the second core part>
Next, the boundary portion between the first core portion 10A and the second core portion 10B will be described. In the stator core 10, since the second core portions 10B are arranged on both sides of the first core portion 10A in the axial direction, there are two boundary portions between the

core portions

10A and 10B.

In the first embodiment described above, at the boundary portion between the first core portion 10A and the second core portion 10B above the first core portion 10A, the caulking portion 15 of the yoke portion 11 of the second steel plate 9B (FIG. 7 (B)). ) Engage with the concave portion of the caulked portion 15 (FIG. 7 (A)) of the yoke portion 11 of the first steel plate 9A.

On the other hand, at the boundary portion between the first core portion 10A and the second core portion 10B below the first core portion 10A, the convex portion of the crimped portion 15 (FIG. 7 (A)) of the teeth 12 of the first core portion 10A is formed. Since the flat surfaces of the teeth 12 of the second core portion 10B face each other, the engagement state between the convex portion and the concave portion cannot be obtained.

However, as shown in FIG. 19, there is an adhesive between the first steel plate 9A at the end of the first core portion 10A and the second steel plate 9B at the end of the second core portion 10B. A layer (adhesive layer) 7 is provided, and the convex portion of the crimped portion 15 fits inside the adhesive layer 7. Therefore, the first core portion 10A and the second core portion 10B can be reliably fixed.

Further, in the second embodiment described above, at the boundary portion between the first core portion 10A and the second core portion 10B above the first core portion 10A, a convex portion of the caulking portion 15 (FIG. 10 (B)) having a small area is formed. , Engage with the recess of the caulked portion 15 (FIG. 10 (A)) having a large area.

On the other hand, at the boundary between the first core portion 10A and the second core portion 10B below the first core portion 10A, the convex portion of the caulking portion 15 (FIG. 10 (A)) having a large area is the caulking portion 15 having a small area (FIG. 10 (A)). Since it faces the concave portion of FIG. 10 (B), the engagement state between the convex portion and the concave portion cannot be obtained.

Also in this case, as shown in FIG. 19, the adhesive layer 7 is between the first steel plate 9A at the end of the first core portion 10A and the second steel plate 9B at the end of the second core portion 10B. Is provided, and the convex portion of the crimped portion 15 fits inside the adhesive layer 7. Therefore, the first core portion 10A and the second core portion 10B can be reliably fixed. Further, when the first core portion 10A and the second core portion 10B are laminated, the recess of the caulking portion 15 (FIG. 10 (B)) having a small area is deformed, and the caulking portion 15 (FIG. 10 (A)) having a large area is deformed. )) May engage with the convex part.

Further, as shown in FIG. 20, a through hole 105 is formed through the first core portion 10A and the second core portion 10B of the stator core 10 in the axial direction, and a metal fixing pin 81 is formed in the through hole 105. The first core portion 10A and the second core portion 10B may be firmly fixed by fitting.

<Structure of split core>
21 (A) and 21 (B) are schematic views for explaining the divided core 8 constituting the stator core 10 of the first to fifth embodiments.

In the stator core 10 shown in FIG. 21 (A), a plurality of divided cores 8 are connected by a thin-walled connecting portion 17 formed on the outer peripheral side of the yoke portion 11 and extend in a strip shape. The thin-walled connecting portion 17 is a thin-walled portion formed on the outer peripheral side of the dividing surface 14 in the yoke portion 11. By plastically deforming the thin-walled connecting portion 17, the stator core 10 can be assembled in an annular shape as shown in FIG.

In the stator core 10 shown in FIG. 21 (B), a plurality of divided cores 8 are independently configured. By welding the split cores 8 to each other on the split surface 14, the annular stator core 10 shown in FIG. 2 is obtained.

Since the stator core 10 shown in FIGS. 21A and 21B has a plurality of divided cores 8 connected to each other, the roundness is improved as compared with the stator core in which the electromagnetic steel sheets punched in an annular shape are laminated. Hateful. In each of the above-described embodiments, the compressive stress from the shell 40 is concentrated on the second core portion 10B of the stator core 10, and the stator core 10 is strongly tightened, so that the roundness can be improved.

Further, instead of the thin-walled connecting portion 17 shown in FIG. 21 (A), the joint wrap shown in FIG. 22 may be provided. The joint wrap is a support shaft Z for deforming the split core 8 from a strip shape to an annular shape by alternately combining the caulking portions 19 formed on the steel plates 9 of the adjacent split cores 8.

Note that the stator core is not limited to the one configured by combining a plurality of divided cores 8 (FIG. 2), and may be a laminated electric steel sheet punched in an annular shape.

<Other configuration examples>
FIG. 23 is a vertical cross-sectional view showing another configuration example of the motor 100. In the first embodiment, the second core portions 10B are arranged at both ends in the axial direction of the stator core 10, and the first core portion 10A is arranged at the center in the axial direction (see FIG. 4).

On the other hand, in the configuration example shown in FIG. 23, the second core portions 10B are arranged at a total of three locations, the center in the axial direction and both ends in the axial direction of the stator core 10. Further, the first core portion 10A is arranged at two locations on both sides of the second core portion 10B at the center in the axial direction.

Even in such a configuration, the stator core 10 can be firmly held by the second core portion 10B coming into contact with the shell 40, and the first core portion 10A does not come into contact with the shell 40, so that the compression is performed. Iron loss due to stress can be reduced.

Further, the arrangement of the first core portion 10A and the second core portion 10B is not limited to the arrangement shown in FIGS. 4 and 23. The first core portion 10A and the second core portion 10B are arranged in the axial direction, the first core portion 10A faces the shell 40 at intervals, and the second core portion 10B abuts on the shell 40. I just need to be there.

FIG. 24 is a schematic view showing the cross-sectional shape of the crimped portion 15 in the long side direction. FIG. 24 is a diagram created based on an enlarged image obtained by cutting the stator core 10 in a plane parallel to the axial direction and observing the cut plane with a microscope. From FIG. 24, it can be seen that the bottom surface 15a of the crimped portion 15 is a flat surface orthogonal to the axial direction, and the side surface 15b is a surface inclined with respect to the axial direction.

<Compressor configuration>
Next, the compressor 500 to which the motor of each embodiment can be applied will be described. FIG. 25 is a vertical cross-sectional view showing the compressor 500. The compressor 500 is a rotary compressor and is used, for example, in an air conditioner 400 (FIG. 26). The compressor 500 includes a compression mechanism unit 501, an electric motor 100 for driving the compression mechanism unit 501, a shaft 60 for connecting the compression mechanism unit 501 and the electric motor 100, and a closed container 507 for accommodating these. Here, the axial direction of the shaft 60 is the vertical direction, and the electric motor 100 is arranged above the compression mechanism portion 501.

The closed container 507 is a container made of a steel plate, and has a cylindrical shell 40, a container upper portion that covers the upper side of the shell 40, and a container bottom that covers the lower side of the shell 40. The stator 1 of the electric motor 100 is incorporated inside the shell 40 of the closed container 507 by shrink fitting, press fitting, welding, or the like.

At the upper part of the closed container 507, a discharge pipe 512 for discharging the refrigerant to the outside and a terminal 511 for supplying electric power to the motor 100 are provided. Further, an accumulator 510 for storing the refrigerant gas is attached to the outside of the closed container 507. Refrigerating machine oil that lubricates the bearing portion of the compression mechanism portion 501 is stored in the bottom of the closed container 507.

The compression mechanism unit 501 includes a cylinder 502 having a cylinder chamber 503, a rolling piston 504 fixed to a shaft 60, a vane that divides the inside of the cylinder chamber 503 into a suction side and a compression side, and both ends in the axial direction of the cylinder chamber 503. It has an upper frame 505 and a lower frame 506 that close the frame.

Both the upper frame 505 and the lower frame 506 have a bearing portion that rotatably supports the shaft 60. An upper discharge muffler 508 and a lower discharge muffler 509 are attached to the upper frame 505 and the lower frame 506, respectively.

The cylinder 502 is provided with a cylindrical cylinder chamber 503 centered on the axis C1. An eccentric shaft portion 60a of the shaft 60 is located inside the cylinder chamber 503. The eccentric shaft portion 60a has a center eccentric with respect to the axis C1. A rolling piston 504 is fitted on the outer circumference of the eccentric shaft portion 60a. When the electric motor 100 rotates, the eccentric shaft portion 60a and the rolling piston 504 rotate eccentrically in the cylinder chamber 503.

The cylinder 502 is formed with a suction port 515 for sucking the refrigerant gas in the cylinder chamber 503. A suction pipe 513 communicating with the suction port 515 is attached to the closed container 507, and refrigerant gas is supplied from the accumulator 510 to the cylinder chamber 503 via the suction pipe 513.

Low-pressure refrigerant gas and liquid refrigerant are mixedly supplied to the compressor 500 from the refrigerant circuit of the air conditioner 400 (FIG. 26), but when the liquid refrigerant flows into the compression mechanism section 501 and is compressed. , It causes a failure of the compression mechanism unit 501. Therefore, the accumulator 510 separates the liquid refrigerant and the refrigerant gas, and supplies only the refrigerant gas to the compression mechanism unit 501.

As the refrigerant, for example, R410A, R407C, R22, etc. may be used, but from the viewpoint of preventing global warming, it is desirable to use a refrigerant having a low GWP (global warming potential).

The operation of the compressor 500 is as follows. When an electric current is supplied from the terminal 511 to the coil 3 of the stator 1, an attractive force and a repulsive force are generated between the stator 1 and the rotor 5 due to the rotating magnetic field generated by the electric current and the magnetic field of the permanent magnet 55 of the rotor 5. , The rotor 5 rotates. Along with this, the shaft 60 fixed to the rotor 5 also rotates.

Low-pressure refrigerant gas is sucked into the cylinder chamber 503 of the compression mechanism unit 501 from the accumulator 510 via the suction port 515. In the cylinder chamber 503, the eccentric shaft portion 60a of the shaft 60 and the rolling piston 504 attached to the shaft portion 60a rotate eccentrically to compress the refrigerant in the cylinder chamber 503.

The refrigerant compressed in the cylinder chamber 503 is discharged into the closed container 507 through a discharge port and discharge mufflers 508 and 509 (not shown). The refrigerant discharged into the closed container 507 rises in the closed container 507 through the holes 57, 58 (FIG. 1) of the rotor core 50, is discharged from the discharge pipe 512, and is discharged from the discharge pipe 512, and is discharged from the air conditioner 400 (FIG. 26). It is sent to the refrigerant circuit of.

Since the motors described in the first to fifth embodiments and the modified examples can be applied to the compressor 500, the operating efficiency of the compressor 500 can be improved.

<Air conditioner>
Next, the air conditioner 400 provided with the compressor 500 shown in FIG. 25 will be described. FIG. 26 is a diagram showing an air conditioner 400. The air conditioner 400 includes the compressor 500, a four-way valve 401 as a switching valve, a condenser 402 that condenses the refrigerant, a pressure reducing device 403 that depressurizes the refrigerant, and an evaporator 404 that evaporates the refrigerant. It is provided with a refrigerant pipe 410 for connecting the above.

The compressor 500, the four-way valve 401, the condenser 402, the decompression device 403, and the evaporator 404 are connected by a refrigerant pipe 410 to form a refrigerant circuit. Further, the compressor 500 includes an outdoor blower 405 facing the condenser 402 and an indoor blower 406 facing the evaporator 404.

The operation of the air conditioner 400 is as follows. The compressor 500 compresses the sucked refrigerant and sends it out as a high-temperature and high-pressure refrigerant gas. The four-way valve 401 switches the flow direction of the refrigerant, and during the cooling operation, as shown in FIG. 26, the refrigerant sent out from the compressor 500 flows to the condenser 402.

The condenser 402 exchanges heat between the refrigerant sent from the compressor 500 and the outdoor air sent by the outdoor blower 405, condenses the refrigerant, and sends it out as a liquid refrigerant. The depressurizing device 403 expands the liquid refrigerant sent out from the condenser 402 and sends it out as a low-temperature low-pressure liquid refrigerant.

The evaporator 404 exchanges heat between the low-temperature low-pressure liquid refrigerant sent from the decompression device 403 and the indoor air, evaporates (vaporizes) the refrigerant, and sends it out as a refrigerant gas. The air whose heat has been taken away by the evaporator 404 is supplied to the room, which is the air-conditioned space, by the indoor blower 406.

During the heating operation, the four-way valve 401 sends the refrigerant sent from the compressor 500 to the evaporator 404. In this case, the evaporator 404 functions as a condenser, and the condenser 402 functions as an evaporator.

Since the compressor 500 has high operating efficiency as described above, the operating efficiency of the air conditioner 400 can be improved.

Although the preferred embodiments of the present invention have been specifically described above, the present invention is not limited to the above embodiments, and various improvements or modifications are made without departing from the gist of the present invention. be able to.

1 stator, 3 coils, 5 rotors, 7 adhesive layers, 8 split cores, 9 steel plates, 9A first steel plates, 9B second steel plates, 10 stator cores, 10A first core parts, 10B second core parts, 11 Yoke part, 12 teeth, 13 slots, 14 division surface, 15, 16 caulking part, 15a, 16a bottom surface, 15b, 15c, 16a side surface, 15c side surface, 15d protruding surface, 17 thin-walled connecting part, 18 recess, 19 caulking part, 20 Insulator, 25 Insulation film, 40 Shell, 41 Inner circumference, 50 Rotor core, 51 Magnet insertion hole, 55 Permanent magnet, 60 Shaft, 81 Fixing pin, 100 Motor, 101 Front surface, 102 Back surface, 105 Through hole, 110 Outer circumference 111 Outer circumference 112 Inner circumference, 400 Air conditioner, 402 Condenser, 403 Decompressor, 404 Evaporator, 405 Outdoor blower, 406 Indoor blower, 410 Refrigerant piping, 500 Compressor, 501 Compressor mechanism, 507 Closed container.

Claims

The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
The number of the caulked portions per one of the at least one second steel plate is smaller than the number of the caulked portions per one of the at least one first steel plate.
The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
The total area of the crimped portion per at least one of the second steel plates is smaller than the total area of the crimped portion of each of the at least one first steel plate.
The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
A stator in which the depth of the crimped portion of at least one of the second steel plates is shallower than the depth of the crimped portion of at least one of the first steel plates.
The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
The angle formed by the side surface of the crimped portion of at least one of the second steel plates and the axis is larger than the angle formed by the side surface of the crimped portion of at least one of the first steel plates and the axis. ..
The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
The crimped portion of at least one of the second steel plates has a rectangular shape in a plane orthogonal to the direction of the axis.
The crimped portion of at least one of the first steel plates is a stator having a circular shape in a plane orthogonal to the direction of the axis.
The stator of the motor built into the shell
Having a stator core having a first core portion and a second core portion in the direction of the axis,
The first core portion faces the shell at intervals, and the second core portion abuts on the shell.
The first core portion has a first steel plate laminated in the direction of the axis and fixed by a caulking portion.
The second core portion has a second steel plate laminated in the direction of the axis and fixed by a caulking portion.
The load required to peel off the second steel plate is smaller than the load required to peel off the first steel plate.
The stator according to any one of claims 1 to 6, wherein the second core portion is located on both sides of the first core portion in the direction of the axis of the stator core.
At least one of the caulked portions of the second steel plate closest to the first core portion in the second core portion is the first one closest to the second core portion in the first core portion. The stator according to any one of claims 1 to 7, which overlaps with at least one of the crimped portions of the steel sheet in the direction of the axis.
The first steel plate located at the end of the first core portion and the second steel plate located at the end of the second core portion are fixed to each other via an adhesive layer.
The stator according to any one of claims 1 to 8, wherein the caulked portion of the first steel plate or the second steel plate is located inside the adhesive layer.
The stator according to any one of claims 1 to 9, which has a fixing pin that penetrates the stator core in the direction of the axis.
The stator according to any one of claims 1 to 10, wherein the stator core has a plurality of divided cores connected in the circumferential direction about the axis.
The stator according to any one of claims 1 to 11,
An electric motor including a rotor provided inside the stator in the radial direction centered on the axis.
The motor according to claim 12 and
A compression mechanism driven by the motor and
A compressor that houses the compression mechanism and includes a closed container having the shell.
An air conditioner including the compressor, a condenser, a decompression device, and an evaporator according to claim 13.