Laminated iron core and rotating machine

Abstract

To provide a laminated iron core and a rotary machine that increase the degree of adhesion between metal plates.SOLUTION: The laminated iron core includes a plurality of metal plates. The plurality of metal plates includes a first metal plate in which a V-shaped fold portion is formed and a second metal plate in which a through-hole into which the fold portion is inserted is formed. The first metal plate and the second metal plate are alternately laminated and mutually connected by a caulking portion formed by the fold portion being fitted into the through-hole.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a laminated core and a rotating machine. [Background technology]

[0002] Laminated cores are known that are formed by stacking thin metal plates and joining the metal plates together by crimping. For example, V-crimping, in which metal plates are joined at V-shaped bent portions, is known as a method of crimping metal plates (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-198518 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when metal plates are joined together using V-crimping, the V-shaped bent portions of the stacked metal plates come into contact with each other, connecting the metal plates, which can create gaps between the metal plates and reduce the degree of adhesion between the metal plates.

[0005] The disclosed technology has been made in view of the above, and aims to provide a laminated core and a rotating machine that increase the degree of adhesion between metal plates. [Means for solving the problem]

[0006] One aspect of the laminated core disclosed herein is a laminated core in which multiple metal plates are stacked. The multiple metal plates include a first metal plate having a V-shaped bent portion formed therein and a second metal plate having a through hole formed therein into which the bent portion is inserted and having a thickness equal to that of the first metal plate. The first metal plate and the second metal plate are alternately stacked and connected to each other by a crimped portion formed by fitting the bent portion into the through hole. The first metal plate has a bent portion formed at a position corresponding to the crimped portion in the stacking direction but no through hole formed therein, and the second metal plate has a through hole formed at a position corresponding to the crimped portion in the stacking direction but no bent portion formed therein. The bend depth d at the bent portion of the first metal plate is 1.5 times or more and 2.0 times or less the thickness t of the first metal plate. R . [Effects of the Invention]

[0007] According to one aspect of the laminated core disclosed in the present application, the degree of adhesion between the metal plates can be increased. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a compressor provided with a three-phase motor according to a first embodiment. [Figure 2] FIG. 2 is a top view showing the stator core. [Figure 3] FIG. 3 is a cross section taken along line III-III in FIG. [Figure 4] FIG. 4 is a bottom view showing the bent portion. [Figure 5] FIG. 5 is a bottom view showing the through-hole. [Figure 6] FIG. 6 is a cross-sectional view illustrating the laminated state of a stator core in a comparative example. [Figure 7] FIG. 7 is a cross-sectional view illustrating a laminated state of the stator core in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, examples of the laminated core and rotating machine disclosed in the present application will be described in detail with reference to the drawings. Note that the laminated core and rotating machine disclosed in the present application are not limited to the following examples. [Example]

[0010] Hereinafter, a laminated core and a rotating machine according to an embodiment of the present disclosure will be described with reference to the drawings. Note that the following description does not limit the technology of the present disclosure. In the following description, the same components are given the same reference numerals, and duplicated descriptions will be omitted.

[0011] FIG. 1 is a longitudinal cross-sectional view showing a compressor 1 provided with a three-phase motor (hereinafter referred to as "motor") 6 of a first embodiment. As shown in FIG. 1, the compressor 1 includes a container 2, a shaft 3, a compressor unit 5, and a motor 6. The container 2 defines a sealed internal space 7. The internal space 7 is formed in a generally cylindrical shape. The container 2 is formed so that, when placed upright on a horizontal surface, the central axis of the cylinder of the internal space 7 is parallel to the vertical direction. The container 2 defines an oil reservoir 8 at the bottom of the internal space 7. The oil reservoir 8 stores refrigeration oil for lubricating the compressor unit 5. The container 2 is connected to a suction pipe 11 that draws in refrigerant and a discharge pipe 12 that discharges compressed refrigerant. The shaft 3 is formed in a rod shape and is disposed in the internal space 7 of the container 2 so that one end is disposed in the oil reservoir 8. The shaft 3 is supported by the container 2 so as to be rotatable about a rotation axis P (see FIG. 2) that is parallel to the central axis of the cylinder defined by the internal space 7. The shaft 3 rotates to supply refrigeration oil stored in the oil reservoir 8 to the compressor section 5 .

[0012] The compressor unit 5 is disposed at the bottom of the internal space 7 and above the oil sump 8. The compressor 1 further includes an upper muffler cover 14 and a lower muffler cover 15. The upper muffler cover 14 is disposed above the compressor unit 5 in the internal space 7. The upper muffler cover 14 defines an upper muffler chamber 16 therein. The lower muffler cover 15 is disposed below the compressor unit 5 in the internal space 7 and above the oil sump 8. The lower muffler cover 15 defines a lower muffler chamber 17 therein. The lower muffler chamber 17 communicates with the upper muffler chamber 16 via a communication passage (not shown) formed in the compressor unit 5. A compressed refrigerant discharge hole 18 is formed between the upper muffler cover 14 and the shaft 3, and the upper muffler chamber 16 communicates with the internal space 7 via the compressed refrigerant discharge hole 18.

[0013] The compressor unit 5 is a so-called rotary compressor that compresses the refrigerant supplied from the suction pipe 11 as the shaft 3 rotates, and supplies the compressed refrigerant to the upper muffler chamber 16 and the lower muffler chamber 17. The refrigerant is compatible with refrigeration oil. The motor 6 is disposed above the compressor unit 5 in the internal space 7. The motor 6 includes a rotor 21 and a stator 22. The rotor 21 is fixed to the shaft 3. The stator 22 is formed in a generally cylindrical shape, is disposed so as to surround the rotor 21, and is fixed to the container 2 by welding. The stator 22 includes a stator core 23, an upper insulator 24, a lower insulator 25, and a plurality of windings 26. The upper insulator 24 is disposed above the stator core 23. The lower insulator 25 is disposed below the stator core 23. The upper insulator 24 and the lower insulator 25 are an example of an insulating portion that insulates the stator core 23 from the windings 26 .

[0014] FIG. 2 is a top view showing stator core 23. As shown in FIG. 2, stator core 23 includes a yoke portion 31 and a plurality of stator core teeth portions 32-1 to 32-9. Yoke portion 31 is formed in a generally cylindrical shape. Of the plurality of stator core teeth portions 32-1 to 32-9, first stator core teeth portion 32-1 is formed in a generally columnar shape. One end of first stator core teeth portion 32-1 is formed continuous with the inner circumferential surface of yoke portion 31, that is, formed so as to protrude from the inner circumferential surface of yoke portion 31. Stator core teeth portions other than first stator core teeth portion 32-1 among the plurality of stator core teeth portions 32-1 to 32-9 are also formed in a generally columnar shape, similar to first stator core teeth portion 32-1, and protrude from the inner circumferential surface of yoke portion 31. The plurality of stator core teeth portions 32-1 to 32-9 are further formed on the inner circumferential surface of yoke portion 31 so as to be arranged at equal intervals of 40 degrees.

[0015] A plurality of positioning notches 33-1 to 33-3 are formed on the outer peripheral surface of yoke portion 31. Three positioning notches 33-1 to 33-3 are formed on yoke portion 31. The three positioning notches 33-1 to 33-3 are formed on the outer peripheral surface of yoke portion 31 so as to be equally spaced at 120-degree intervals.

[0016] The stator core 23 is a laminated core formed by stacking multiple metal plates made of a soft magnetic material, such as silicon steel plates. In the stator core 23, the multiple stacked metal plates are connected to each other by multiple crimped portions 34 provided on the yoke portion 31. The multiple crimped portions 34 are arranged at equal intervals in the circumferential direction around the rotation axis P of the motor 6. In the embodiment, three crimped portions 34 are provided on the stator core 23. The three crimped portions 34 are arranged at equal intervals of 120 degrees. Each of the three crimped portions 34 is arranged between circumferentially adjacent stator core teeth portions 32. Note that the locations where the crimped portions 34 are arranged are not particularly limited, and may be arranged, for example, on a semi-linear line extending from the rotation axis P to each stator core tooth portion 32.

[0017] Yoke portion 31 is further formed with a plurality of heat insulating portions 35 that block welding heat that is transferred from the outer circumferential surface of stator core 23 to the inner diameter side when stator core 23 is welded and fixed to container 2. In the embodiment, stator core 23 is provided with six heat insulating portions 35. The six heat insulating portions 35 are arranged in six locations in the yoke portion 31 among the regions between circumferentially adjacent stator core teeth portions 32, excluding three locations where crimped portions 34 are arranged.

[0018] As shown in FIG. 3, the stator core 23 includes a plurality of metal plates, namely, first metal plates 40 and second metal plates 50. The stator core 23 is formed by alternately stacking the first metal plates 40 and the second metal plates 50 one by one. The stacking direction of the plurality of metal plates coincides with the direction of the rotation axis P of the motor 6. FIG. 3 is a cross section taken along line III-III in FIG. 2. The thickness of the first metal plate 40 and the thickness of the second metal plate 50 are equal.

[0019] The first metal plate 40 has a bent portion 41 and a groove portion 43 formed as the crimped portion 34. The bent portion 41 is formed by bending a portion of the first metal plate 40 into a V-shape. The first metal plate 40 includes a flat plate portion 42 that is not bent around the crimped portion 34, and a groove portion 43 that is recessed in the thickness direction of the first metal plate 40 relative to the flat plate portion 42 by the formation of the bent portion 41. In this embodiment, the groove portion 43 is formed as a triangular space surrounded by an imaginary plane along the surface of the flat plate portion 42 and the V-shaped surface of the bent portion 41.

[0020] The second metal plate 50 has a through hole 51 formed as the crimped portion 34. The second metal plate 50 has a flat portion 52 that is not bent around the crimped portion 34.

[0021] The bent portion 41 is inserted into the through hole 51 and the groove portion 43, and the bent portion 41 is brought into close contact with the edges of the through hole 51 and the groove portion 43, thereby forming the crimped portion 34. By forming the crimped portion 34, the first metal plate 40 and the second metal plate 50 are joined to each other, and the two first metal plates 40 sandwiching the second metal plate 50 therebetween are joined to each other.

[0022] Furthermore, the bent portion 41 is formed so that the bending depth d is greater than the thickness t of the first metal plate 40 (or the thickness t of the second metal plate 50). That is, the bending depth d of the bent portion 41 is greater than the thickness t of the first metal plate 40 or the second metal plate 50. Here, the bending depth d refers to the depth of a groove 43 recessed from the flat portion 42 of the first metal plate 40 by the formation of the bent portion 41 in the stacking direction of the metal plates (the direction of the rotation axis P). That is, as shown in FIG. 3 , the bending depth d refers to the height, in the direction of the rotation axis P, between the upper surface of the flat portion 42 of the first metal plate 40 and the bottom 43 a of the groove 43 formed by the bent portion 41 of the first metal plate 40. Preferably, the thickness t of the first metal plate 40 and the bending depth d satisfy the relationship 1.5t≦d≦2.0t. In this embodiment, the bending depth d of the bent portion 41 is set to about 1.8 times the thickness t of the first metal plate 40.

[0023] Because the bending depth d of the bent portion 41 is greater than the thickness t of the first metal plate 40, a region A1 of the bent portion 41 of the first metal plate 40 that protrudes downward from the flat portion 42 of the first metal plate 40 is inserted into the through hole 51 of the second metal plate 50 adjacent to the first metal plate 40. At this time, the side portions (41b, 41d, see FIG. 4) along the longitudinal direction of the bent portion 41 of the first metal plate 40 come into close contact with the side surfaces (51b, 51d, see FIG. 5) along the longitudinal direction of the through hole 51 of the second metal plate 50. This bonds the first metal plate 40 and the adjacent second metal plate 50 to each other.

[0024] Furthermore, by setting the bending depth d of the bent portion 41 to 1.5 to 2 times the thickness t of the first metal plate 40, a region A2 of the bent portion 41 of the first metal plate 40 that protrudes further downward than the flat portion 52 of the second metal plate 50 adjacent to the first metal plate 40 fits into a groove portion 43 of another first metal plate 40 that is arranged in the direction of the rotation axis P with the second metal plate 50 sandwiched therebetween. Then, side portions (41b, 41d) along the longitudinal direction of the bent portion 41 of the first metal plate 40 are in close contact with side portions (41b, 41d) along the longitudinal direction of the bent portion 41 of another first metal plate 40 that is arranged in the direction of the rotation axis P with the second metal plate 50 sandwiched therebetween. As a result, the first metal plate 40 and the other first metal plates 40 that are arranged in the direction of the rotation axis P with the second metal plate 50 sandwiched therebetween are joined to each other.

[0025] In the stator core 23, two second metal plates 50 are continuously stacked on one end side (the lower end side in FIG. 1 ) in the stacking direction of the first metal plates 40 and the second metal plates 50. One end in the stacking direction is the end on the side where the bent portions 41 of the first metal plates 40 protrude. In addition, the first metal plate 40 is disposed on the other end in the stacking direction of the stator core 23. The other end in the stacking direction is the end opposite the side where the bent portions 41 of the first metal plates 40 protrude.

[0026] In the stator core 23, at one end side in the stacking direction, the bent portion 41 of the first metal plate 40 is inserted into the through holes 51 of the two second metal plates 50, so that the bent portion 41 fits into the through holes 51 of the two second metal plates 50. This bonds the first metal plate 40 and the two second metal plates 50 to each other. In addition, because the bending depth d of the bent portion 41 is equal to or less than twice the thickness t of the second metal plate 50, the tip of the bent portion 41 does not protrude from the lower end of the stator core 23.

[0027] In this way, in the stator core 23, the first metal plate 40 and the second metal plate 50 are crimped and joined together by V-crimping.

[0028] As shown in FIG. 4, the bent portion 41 of the first metal plate 40 is formed in a generally rectangular shape in a plan view. FIG. 4 is a bottom view showing the bent portion 41. The bent portion 41 is formed so that the distance between sides 41a and 41c that are the starting points of the bent portion 41 (the length of the bent portion 41 in the longitudinal direction) is "L1." The bent portion 41 is also formed so that the length in the lateral direction (the distance between side portions 41b and 41d of the bent portion 41) is "W1." Here, the sides 41a and 41c that are the starting points of the bent portion 41 are positions that are base points for the bent portion 41 to protrude toward the through-hole 51 on the second metal plate 50 side. In other words, the sides 41a and 41c that are the starting points of the bent portion 41 are positions that are the starting points of the protruding surface 41e of the bent portion 41. The protruding surface 41e is a surface of the folded portion 41 in the stacking direction that is one end side of the folded portion 41. The distance between sides 41a and 41c that are the starting points of the folded portion 41, i.e., the length of the folded portion 41 in a direction perpendicular to the folding line 41f in a plan view (a direction parallel to the side portions 41b and 41d of the folded portion 41), is "L1." The folded portion 41 has the folding line 41f formed by being bent into a V-shape. Note that the first metal plate 40 does not have a through hole at a position corresponding to the crimped portion 34 in the direction of the rotation axis P (a position corresponding to the through hole 51 formed in the second metal plate 50).

[0029] As shown in FIG. 5, the through hole 51 of the second metal plate 50 is formed in a generally rectangular shape in a plan view. FIG. 5 is a bottom view showing the through hole 51. The through hole 51 is formed so that its length in the longitudinal direction (the length perpendicular to the sides 41a and 41c that are the starting points of the bent portion 41 of the first metal plate 40) is "L2." The through hole 51 is also formed so that its width in the lateral direction (the distance between the side portions 41b and 41d of the bent portion 41) is "W2." Here, the length L2 in the longitudinal direction of the through hole 51 (hereinafter referred to as "the length of the through hole 51") is the distance between the side surfaces 51a and 51c that are parallel to the bending line 41f of the bent portion 41, among the side surfaces 51a to 51d that form the through hole 51. The second metal plate 50 does not have a bent portion at a position corresponding to the crimped portion 34 in the direction of the rotation axis P (a position corresponding to the bent portion 41 formed on the first metal plate 40).

[0030] In the first metal plate 40 and the second metal plate 50, the distance (length) L1 between the sides 41a and 41c that are the starting points of the bent portion 41 is shorter than the length L2 of the through hole 51 in the longitudinal direction. In other words, L2 is greater than L1 (L2>L1). As a result, the bent portion 41 and the through hole 51 are arranged so that the protruding surface 41e does not come into contact with the second metal plate 50 when the first metal plate 40 and the second metal plate 50 are stacked and joined. Therefore, the first metal plate 40 and the second metal plate 50 can be tightly attached without any gaps in the stacking direction.

[0031] In the first metal plate 40 and the second metal plate 50, the distance W1 between the side portions 41b, 41d of the bent portion 41 is approximately equal to the width W2 of the through hole 51 in the short direction (W1≈W2), or the distance W1 is slightly greater than the width W2 (W1>W2). This allows the side portion 41b of the first metal plate 40 to tightly contact the side surface 51b of the through hole 51 in the second metal plate 50, and also allows the side portion 41d of the first metal plate 40 to tightly contact the side surface 51d of the through hole 51 in the second metal plate 50. This increases the strength of the adhesion between the first metal plate 40 and the second metal plate 50.

[0032] The following describes a manufacturing method of the stator core 23. The first metal plate 40 is formed by press working using a plurality of dies corresponding to the shape of the first metal plate 40. The second metal plate 50 is formed by press working using a plurality of dies corresponding to the shape of the second metal plate 50.

[0033] The first metal plate 40 and the second metal plate 50 are stacked in the order in which they form the stator core 23, and are joined by pressing in the stacking direction. The first metal plate 40 and the second metal plate 50 are stacked while being positioned by positioning members (not shown) inserted into the positioning notches 33-1 to 33-3, and are then pressed in the stacking direction.

[0034] Specifically, after two second metal plates 50 are stacked, the first metal plate 40 is stacked, and a press process is performed so that the bent portions 41 of the first metal plate 40 are fitted into the through holes 51 of the two second metal plates 50. In this way, the two second metal plates 50 and the first metal plate 40 are bonded together.

[0035] Furthermore, the second metal plate 50 and the first metal plate 40 are stacked, and a press process is performed so that the bent portions 41 of the first metal plate 40 are fitted into the through holes 51 of the second metal plate 50 and into the grooves 43 of the first metal plate 40 that are aligned in the stacking direction with the second metal plate 50 sandwiched therebetween. In this way, the second metal plate 50 and the first metal plate 40 are bonded to the laminate of the already bonded first metal plate 40 and second metal plate 50. The second metal plate 50 and the first metal plate 40 are further stacked, and the press process is repeated to manufacture the stator core 23.

[0036] Here, a stator core 100 in a comparative example will be described. As shown in Fig. 6, the stator core 100 in the comparative example is formed by continuously stacking first metal plates 40 each having a V-shaped bent portion 41. Fig. 6 is a cross-sectional view illustrating the stacked state of the stator core 100 in the comparative example. The cross-sectional view of Fig. 6 is a cross-sectional view at a location corresponding to the cross-section of Fig. 3 in the first embodiment.

[0037] In the stator core 100 according to the comparative example, first metal plates 40 each having a bent portion 41 formed thereon are stacked and then pressed to bond the first metal plates 40 together. Specifically, the press process is performed so that the bent portion 41 of one first metal plate 40 is fitted into the groove portion 43 of an adjacent first metal plate 40. Note that, similar to the first embodiment, two second metal plates 50 each having a through hole 51 formed therein and into which the bent portion 41 is inserted are stacked continuously at one end in the stacking direction.

[0038] In the stator core 100 according to the comparative example, the bent portions 41 of adjacent first metal plates 40 come into contact with each other in the stacking direction. As a result, gaps are generated between the first metal plates 40. For example, if the thickness of the first metal plates 40 is "T," the height of the bent portions 41 in the stacking direction (direction of the rotation axis P) is "H," and the size of the gap in the stacking direction generated between the first metal plates 40 is "C," then the height H is given by equation (1).

[0039] H=T+C (1)

[0040] Furthermore, if the bending angle of the bending portion 41 (the angle between the surface of the flat portion 42 and the surface of the bending portion 41) is "θ", the relationship between the height H, the thickness T of the first metal plate 40, and the bending angle θ is expressed by equation (2).

[0041] Hcosθ=T (2)

[0042] From equations (1) and (2), the gap C is given by equation (3).

[0043] C=HT=T((1 / cosθ)-1) (3)

[0044] When the stator core 100 is formed by stacking the first metal plates 40 in this manner, a gap C occurs between adjacent first metal plates 40. For example, when the bending angle θ of the bent portion 41 is set to 30 degrees, a gap C of approximately 0.15 times the thickness T of the first metal plates 40 occurs. Therefore, in the stator core 100 according to the comparative example, the degree of adhesion between the first metal plates 40 decreases. Furthermore, the thickness of the stator core 100 according to the comparative example increases by an amount corresponding to the gap C, which corresponds to the number of stacked first metal plates 40.

[0045] In response to this, it is also conceivable to eliminate the gaps C between the first metal plates 40 by pressing the stator core 100 in which the first metal plates 40 are stacked in the stacking direction.

[0046] However, in this case, the number of steps increases because a pressing step is required to reduce the gap C. Also, a device for performing the pressing step to reduce the gap C is required, which increases the manufacturing cost.

[0047] In contrast, the stator core 23 of this embodiment is a laminated core in which multiple metal plates are stacked. The multiple metal plates include first metal plates 40 and second metal plates 50. The first metal plates 40 have V-shaped bent portions 41 formed therein. The second metal plates 50 have through holes 51 into which the bent portions 41 are inserted. Except for one end side of the stator core 23 in the stacking direction, the first metal plates 40 and the second metal plates 50 are stacked alternately one by one, and are joined by fitting the bent portions 41 into the through holes 51.

[0048] As a result, the stator core 23 can prevent gaps from occurring between the first metal plate 40 and the second metal plate 50, thereby increasing the degree of adhesion between the first metal plate 40 and the second metal plate 50. The stator core 23 can also prevent an increase in thickness in the direction of the rotation axis P of the motor 6. The stator core 23 can also be made thinner without performing a pressing process to eliminate gaps between the metal plates. Therefore, the number of manufacturing processes for the stator core 23 can be reduced. The stator core 23 can also prevent an increase in manufacturing costs for manufacturing the stator core 23.

[0049] The first metal plate 40 has bent portions 41 formed as the crimped portions 34, but no through holes. Furthermore, the second metal plate 50 has no through holes formed in the crimped portions 34. For example, it is conceivable to form a stator core by forming either bent portions or through holes in each of the multiple crimped portions 34 in a single metal plate. However, in such a stator core, for example, if an odd number of crimped portions are provided in the circumferential direction around the rotating shaft of the motor, the number of bent portions and through holes in a single metal plate will differ. Therefore, there is a risk that the crimped strength of the stator core will vary in the circumferential direction.

[0050] In contrast, in the stator core 23 of the present embodiment, when focusing on each of the multiple metal plates (first metal plate 40, second metal plate 50) forming the stator core 23, the multiple crimped portions 34 provided in the circumferential direction only have either bent portions 41 or through holes 51. That is, in the stator core 23 of the present embodiment, the first metal plate 40 in which the bent portions 41 are formed in the crimped portions 34 but no through holes are formed, and the second metal plate 50 in which the through holes 51 are formed in the crimped portions 34 but no bent portions are formed are stacked, and the first metal plate 40 and the second metal plate 50 are joined to each other. As a result, even when an odd number of crimped portions 34 are evenly provided in the circumferential direction around the rotation axis P of the motor 6, the stator core 23 can suppress variation in crimp strength in the circumferential direction.

[0051] The bending depth d at the bending portion 41 is greater than the thickness t of each metal plate.

[0052] As a result, the bent portion 41 of the first metal plate 40 has a region A1 that protrudes downward more than the flat portion 42 of the first metal plate 40, so that the stator core 23 can join the first metal plate 40 and the second metal plate 50 that are adjacent in the stacking direction. Furthermore, the bent portion 41 of the first metal plate 40 has a region A2 that protrudes further downward more than the flat portion 52 of the second metal plate 50 adjacent to the first metal plate 40. Therefore, the region A2 of the bent portion 41 of the first metal plate 40 fits into the groove portion 43 of another first metal plate 40 that is arranged in the stacking direction with the second metal plate 50 sandwiched therebetween, so that the first metal plates 40 that are arranged with the second metal plate 50 sandwiched therebetween can be joined together. As a result, all of the multiple metal plates that form the stator core 23 can be integrated by the crimped portions 34.

[0053] More preferably, the bending depth d at the bending portion 41 is set to a range of 1.5 to 2 times the thickness t of each metal plate, thereby ensuring a sufficient width for the above-mentioned region A2 and allowing the first metal plates 40, 40 with the second metal plate 50 sandwiched therebetween to be sufficiently tightly attached to each other.

[0054] The distance (length) L1 between the sides 41a and 41c that are the starting points of the bending portion 41 of the first metal plate 40 is shorter than the distance (length) L2 between the sides 51a and 51c that are parallel to the bending line 41f of the bending portion 41, among the sides 51a to 51d that form the through hole 51 of the second metal plate 50.

[0055] As a result, the stator core 23 can prevent contact between the protruding surface 41e of the bent portion 41 of the first metal plate 40 and the side surfaces 51a, 51c of the through hole 51 of the second metal plate 50 in the stacking direction. This prevents a gap from being formed between the first metal plate 40 and the second metal plate 50, thereby improving the degree of adhesion between the first metal plate 40 and the second metal plate 50. This prevents an increase in the thickness of the stator core 23 in the direction of the rotation axis P of the motor 6. Furthermore, the stator core 23 can reduce the number of manufacturing processes. Furthermore, the stator core 23 can prevent an increase in manufacturing costs for manufacturing the stator core 23.

[0056] The first metal plate 40 has a plurality of bent portions 41 formed as the crimped portions 34. The second metal plate 50 has a plurality of through holes 51 formed as the crimped portions 34. The plurality of bent portions 41 and the plurality of through holes 51 are formed at equal intervals in the circumferential direction around the rotation axis P of the motor 6.

[0057] This makes it possible to suppress variations in the crimping strength of the stator core 23 in the circumferential direction. [Example]

[0058] Next, a compressor 1 according to a second embodiment will be described. The compressor 1 according to the second embodiment differs from that according to the first embodiment in the configuration of the stator core 60. A description of the same configuration as that of the compressor 1 according to the first embodiment will be omitted.

[0059] As shown in Fig. 7, in the stator core 60, a distance L3 between sides 71a and 71c that are the starting points of the bent portion 71 of the first metal plate 70 is longer than a length L4 (the distance between the side surfaces 81a and 81c of the through hole 81) of the second metal plate 80. Therefore, the protruding surface 71e of the bent portion 71 of the first metal plate 70 contacts the edge (side surfaces 81b and 81d) of the through hole 81 of the second metal plate 80. Fig. 7 is a cross-sectional view illustrating the stacked state of the stator core 60 in the second embodiment. The cross-sectional view of Fig. 7 is a cross-sectional view at a location corresponding to the cross-section of Fig. 3 in the first embodiment.

[0060] In the cross-sectional view shown in FIG. 7, the distance between the contact point (the upper end of the side surface 81a of the through-hole 81) between the protruding surface 71e of the bent portion 71 and the second metal plate 80 and the side 71a that is the starting point of the bent portion 71 of the first metal plate 70 is defined as "K," and the bending angle of the bent portion 71 is defined as "θ1." Furthermore, the size of the gap in the stacking direction between the first metal plate 70 and the second metal plate 80 in the stator core 60 is defined as "C1." In this case, the distance K, the bending angle θ1, and the gap C1 are expressed by equations (4) and (5).

[0061] C1=Ksinθ1 (4)

[0062] Kcos=(L3-L4) / 2 (5)

[0063] Using equations (4) and (5), the gap C1 is given by equation (6).

[0064] C1=sinθ1(L3-L4) / (2cosθ1)=tanθ1(L3-L4) / 2...(6)

[0065] In this way, a gap C1 is generated between the surface of the first metal plate 70 on the side where the bent portion 71 protrudes and the second metal plate 80. However, in the stator core 60, the surface of the first metal plate 70 opposite the side where the bent portion 71 protrudes abuts against the second metal plate 80. Therefore, compared to the comparative example, no gap is generated on one side of the adjacent first metal plate 70 and second metal plate 80 in the stator core 60, and therefore the thickness in the stacking direction can be reduced.

[0066] In the above embodiments, the stator cores 23 and 60 have been described as an example of a laminated core, but the present invention is not limited to this. The laminated core having the above-described crimped portion 34 may also be used in the rotor core of the rotor 21. That is, a rotor core formed by laminating multiple metal plates may have the multiple metal plates joined together by the above-described crimping method. Furthermore, in the above embodiments, the motor 6 has been described as an example of a rotating machine, but a rotating machine using a laminated core may also be a generator. [Explanation of symbols]

[0067] 1 Compressor 6 Three-phase motor (motor, rotating machine) 23, 60, 100 stator core 34 Crimping part 40, 70 1st metal plate 41, 71 Bend part 41a, 41c Sides that are the starting points of the bent parts 41b, 41d Side 41e Protruding surface 41f Fold line 42 Flat plate part 43 Groove 43a bottom 50, 80 2nd metal plate 51, 81 through holes 52 Flat plate part L1 Distance between 41a and 41c L2 Length of through hole

Claims

1. A laminated core in which a plurality of metal plates are stacked, The plurality of metal plates are a first metal plate having a V-shaped bent portion formed thereon; a second metal plate having a through hole into which the bent portion is inserted and having a thickness equal to that of the first metal plate, the first metal plates and the second metal plates are alternately stacked and joined to each other by crimped portions formed by fitting the bent portions into the through holes, The first metal plate has the bent portion formed at a position corresponding to the crimped portion in the stacking direction, but does not have the through hole formed therein; The second metal plate has the through hole formed at a position corresponding to the crimped portion in the stacking direction, but does not have the bent portion formed therein; A laminated core, wherein a bending depth d at the bending portion of the first metal plate is 1.5 times or more and 2.0 times or less the thickness t of the first metal plate.

2. The distance W1 between the sides of the bent portion is greater than the width W2 of the through hole in the short direction. The laminated core according to claim 1 .

3. the first metal plate has a groove portion recessed by the formation of the bent portion, the bent portion of the first metal plate is inserted into the groove portion of another first metal plate arranged in the stacking direction with the second metal plate sandwiched therebetween, The laminated core according to claim 2 .

4. a distance L1 between the sides that are the start points of the bent portions is shorter than a distance L2 between two of the four side surfaces that form the through hole that are parallel to the sides that are the start points of the bent portions; The laminated core according to any one of claims 1 to 3.

5. The first metal plate has a plurality of the bent portions formed thereon, The second metal plate has a plurality of the through holes formed therein, 5. The laminated core according to claim 1, wherein the plurality of bent portions and the plurality of through holes are formed at equal intervals along the circumferential direction.

6. A rotating machine comprising the laminated core according to any one of claims 1 to 5.

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