Laminated core, motor, and method for manufacturing laminated core

Abstract

The present application provides a kind of laminated core, motor and the manufacturing method of laminated core.Layered core (1) has: first connecting part (551), it is in the outer circumferential surface (512) of the part of one side end (251) in the extension direction of containing core piece (20) in back yoke layering part (51) on the back yoke part (21) is connected along the direction of lamination;And first slot part (552), when observing layered core (1) along the axial direction, it is located in the direction opposite to the first direction in core piece (20) from one side edge (252) towards the other side edge (262) direction in core piece (20) relative to first connecting part (551) across one side edge (252) in the extension direction of core piece (20), and on the outer circumferential surface (512) of back yoke layering part (51) along the direction of lamination of back yoke layering part (51) extends.

Description

TECHNICAL FIELD

[0001] The present application relates to a laminated core, a motor, and a manufacturing method of a laminated core. BACKGROUND

[0002] A manufacturing method of a laminated core is known in which a strip-shaped core piece forming member is wound while being deformed in a spiral shape. For example, a manufacturing method is disclosed in Patent Literature 1 in which a comb-shaped sheet having a strip-shaped core back and a plurality of parallel tooth portions is laminated by being wound in a spiral shape in a state in which the strip-shaped core back is located radially outward of the spiral and the parallel tooth portions are located radially inward of the spiral, thereby manufacturing a spiral-type rotating machine core. In the manufacturing method of Patent Literature 1, when the axial length of a laminate obtained by laminating the comb-shaped sheet reaches a predetermined value, the laminate is cut off from the comb-shaped sheet. In this way, after the laminate is cut off from the comb-shaped sheet, the laminate is subjected to a finishing process such as welding, heat treatment, correction, surface alignment, cutting, deburring, or cleaning, as necessary. Through the above process, the spiral-type rotating machine core is completed.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: International Publication No. 2021 / 010409 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, the laminated core manufactured by winding a strip-shaped core piece forming member while being deformed in a spiral shape has a laminate composed of core pieces wound in a spiral shape and laminated. In the laminate of such a laminated core, in order to prevent the end portions of the core pieces wound in a spiral shape and laminated from being rolled up, it is necessary to fix the end portions of the core pieces.

[0008] On the other hand, in the manufacturing process of the laminated core, the core pieces that constitute the laminate are cut out from a core piece forming member according to the height in the axial direction of the laminated core. When the core pieces are cut out from the core piece forming member, it is desirable to suppress the generation of scrap.

[0009] An object of the present application is to achieve a laminated core, a motor, and a manufacturing method of a laminated core in which the portion that is discarded when core pieces that constitute a laminate are cut out from a core piece forming member can be reduced during the manufacturing process of the laminated core.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The laminated core of one embodiment of the present application has a cylindrical laminated body extending along an axis, which has core pieces laminated in a state where a back yoke portion, a tooth portion, and a slit portion are overlaid in a thickness direction, wherein the core piece has the plate-like back yoke portion extending in a spiral shape with the axis as a center, a plurality of the tooth portions protruding from the back yoke portion toward a radially inner side of the spiral, and a plurality of the slit portions extending from an inner peripheral end surface of the back yoke portion toward a radially outer side of the spiral between a pair of tooth portions adjacent in an extending direction among the plurality of tooth portions. The laminated body has a cylindrical back yoke laminated portion which is the back yoke portion laminated in the thickness direction, a plurality of tooth laminated portions which are the plurality of tooth portions laminated in the thickness direction and arranged in a circumferential direction and protrude from an inner peripheral surface of the back yoke laminated portion toward a radially inner side, and a plurality of slit laminated portions which are the plurality of slit portions laminated in the thickness direction and arranged in the circumferential direction and extend from an inner peripheral end surface of the back yoke laminated portion toward a radially outer side between a pair of the tooth laminated portions adjacent. The laminated core has a first connecting portion connecting the back yoke portion in a laminating direction on an outer peripheral surface of a portion including a one-side end portion of the core piece in the extending direction, and a first groove portion located in a direction opposite to a first direction in which the core piece extends from a one-side end edge toward a other-side end edge with respect to the first connecting portion across the one-side end edge when the laminated core is viewed in an axial direction, and extending in a laminating direction of the back yoke laminated portion on an outer peripheral surface of the back yoke laminated portion.

[0012] The manufacturing method of the laminated core according to the embodiment of the present application is a method of manufacturing a laminated core in a cylindrical shape extending along an axis by deforming a core piece forming member extending in a strip shape in one direction toward one side in a width direction and winding it in a spiral shape. The manufacturing method of the laminated core includes: a punching step of forming the core piece forming member by punching a steel plate in a sheet shape, the core piece forming member having a back yoke portion in a sheet shape extending in the one direction, a plurality of tooth portions protruding from the back yoke portion toward the one side in the width direction, a plurality of slit portions extending between a pair of tooth portions adjacent in the one direction among the plurality of tooth portions in the back yoke portion from an end surface of the back yoke portion on the one side in the width direction toward the other side in the width direction, and a pair of recessed portions at an end portion of the back yoke portion on the other side in the width direction; a laminating step of deforming the core piece forming member toward the one side in the width direction and winding it in a spiral shape, and laminating the back yoke portion, the tooth portions, the slit portions, and the recessed portions to overlap in the axis direction, respectively; a cutting step of cutting between one of the pair of recessed portions and the other recessed portion in a state where the core piece forming member is laminated in the axis direction, thereby forming a core piece; and a joining step of joining, in the recessed portion near the cut end portion of the core piece, the back yoke portion by joining the back yoke portion in the lamination direction on an outer peripheral surface of a back yoke laminated portion formed by laminating the back yoke portion in the axis direction.

[0013] Effects of the Invention

[0014] According to the present application, in the manufacturing process of the laminated core, the portion to be discarded when the core piece constituting the laminated body is cut out from the core piece forming member can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view showing the schematic structure of the laminated core according to Embodiment 1.

[0016] Figure 2 is a perspective view showing the schematic structure of the laminated core according to Embodiment 1. Figure 1

[0017] Figure 3 is a partial enlarged view of the III portion shown in FIG. 3. Figure 2

[0018] Figure 4 is an exploded side view showing the laminated core.

[0019] Figure 5 is a flowchart showing the manufacturing method of the laminated core according to Embodiment 1.

[0020] Figure 6 is a punching diagram of a steel plate.

[0021] ​​Figure 7 is a view illustrating a lamination process and a cutting process.

[0022] Figure 8 is a perspective view showing the schematic structure of the laminated core of Embodiment 2.

[0023] Figure 9 is a perspective view showing the schematic structure of the laminated core of Embodiment 3.

[0024] Figure 10 is a plan view showing the schematic structure of the laminated core shown in Figure 9

[0025] Figure 11 is a plan view showing a core sheet forming member for manufacturing a conventional laminated core.

[0026] Figure 12 is a lamination pattern table of the conventional laminated core.

[0027] Figure 13 is a plan view showing a core sheet forming member for manufacturing a laminated core.

[0028] Figure 14 is a lamination pattern table of the laminated core of Embodiment 3.

[0029] Figure 15 is a plan view showing a core sheet forming member for manufacturing the laminated core of Embodiment 3.

[0030] Figure 16 is a sectional view showing the schematic structure of a motor of an embodiment.

[0031] in the drawing:

[0032] ​1, 2, 3 - stacked iron core, 9 - steel sheet, 10 - iron core piece forming member, 11 - back yoke portion, 12, 12A, 12B - tooth portion, 13 - slit portion, 15 - a pair of recesses, 15A, 15B - recesses, 20 - iron core piece, 21 - back yoke portion, 211 - inner peripheral end surface, 22, 22A, 22B - tooth portion, 23 - slit portion, 251 - one side end portion, 252 - one side end edge, 261 - other side end portion, 262 - other side end edge, 30 - connecting portion, 31 - first intermediate connecting portion, 32 - second intermediate connecting portion, 33 - third intermediate connecting portion, 34 - fourth intermediate connecting portion, 40 - slot portion, 41 - first intermediate slot portion, 42 - second intermediate slot portion, 43 - third intermediate slot portion, 44 - fourth intermediate slot portion, 50 - stacked body, 51 - back yoke stacked portion, 511 - inner peripheral surface, 512 - outer peripheral surface, 52, 52A, 52B - tooth stacked portion, 53 - slit stacked portion, 551 - first connecting portion, 552 - first slot portion, 651 - second connecting portion, 652 - second slot portion, 71 - positioning slot portion, 91 - motor, 92 - rotor, 92a - through hole, 92b - magnet insertion hole, 93 - stator coil, 94 - housing, 95 - shaft, 96 - magnet, CT - cut line, Q - axis, R50 - remaining portion. DETAILED DESCRIPTION

[0033] Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the drawings. In addition, the same or corresponding portions in the drawings are denoted by the same symbols, and their description will not be repeated. In addition, the dimensions of the constituent members in each drawing are not faithfully expressed, and the dimensional ratios of the constituent members, and the like are not faithfully expressed.

[0034] In addition, in the following description, the direction in which the axis line Q of the cylinder of the cylindrical stacked body and the spiral in the iron core piece extending in a spiral shape extend will be referred to as the axial direction, and the direction orthogonal to the axis line Q will be referred to as the radial direction. In addition, in the following description, the spiral shape of the iron core piece will also be expressed as "spiral shape".

[0035] In addition, in the following description, in a plate-shaped member, the direction of the plate thickness will be referred to as the thickness direction of the member. "Observing the member in the thickness direction" means that the direction of the thickness direction and the direction of the line of sight coincide. For example, "observing the iron core piece forming member in the thickness direction" means observing the face of the iron core piece forming member from a position separated from the iron core piece forming member in the thickness direction.

[0036] In addition, in the following description, the same will include not only the case of being strictly the same, but also the case of being substantially considered to be the same.

[0037] Furthermore, in the following explanation, the expressions "fixed," "connected," "joined," and "installed" (hereinafter referred to as "fixed, etc.") include not only cases where parts are directly fixed to each other, but also cases where they are fixed via other parts. That is, in the following explanation, the expression "fixed, etc." includes both direct and indirect fixing of parts to each other.

[0038] (Implementation Method 1)

[0039] (Structure of stacked iron core)

[0040] Reference Figures 1 to 4 The laminated iron core 1 of an exemplary embodiment 1 of the present invention will be described. Figure 1 This is a three-dimensional diagram showing the general structure of the stacked iron core 1. Figure 2 This is a top view showing the general structure of the laminated iron core 1. Figure 3 yes Figure 2 A magnified view of part III shown. Figure 4 This is an exploded side view of the stacked iron core 1.

[0041] The laminated iron core 1 has a cylindrical laminated body 50 extending along the axis Q. The laminated body 50 is composed of iron chip pieces 20 that are spirally wound and stacked in the stacking direction.

[0042] The iron chip 20 has a back magnetic yoke 21, multiple teeth 22 and multiple slits 23.

[0043] The back magnetic yoke 21 is a plate-shaped portion that extends in a spiral shape with axis Q as the center. Multiple teeth 22 protrude radially inward from the back magnetic yoke 21 into the spiral.

[0044] like Figure 2 and Figure 3 As shown, a plurality of slit portions 23 extend from the inner peripheral end face 211 of the back magnetic yoke portion 21 toward the radially outward direction of the spiral between a pair of adjacent teeth 22A, 22B in the aforementioned extension direction of a plurality of teeth 22.

[0045] The iron chip 20 is stacked with the back magnetic yoke 21, the tooth 22 and the slit 23 overlapping in the thickness direction.

[0046] The laminate 50 has a back magnetic yoke laminate 51, a plurality of tooth laminates 52 and a plurality of slit laminates 53.

[0047] The back magnetic yoke stack 51 is stacked with the back magnetic yoke 21 in the aforementioned thickness direction and has a cylindrical shape. The plurality of tooth stacks 52 are stacked with the plurality of teeth 22 in the aforementioned thickness direction, arranged in the circumferential direction, and protruding radially inward from the inner circumferential surface 511 of the back magnetic yoke stack 51.

[0048] Multiple slit stacks 53 are stacked in the thickness direction, arranged in the circumferential direction, and extend radially outward from the inner circumferential surface 511 of the back magnetic yoke stack 51 between adjacent pairs of tooth stacks 52A and 52B.

[0049] The laminated iron core 1 has a first connecting portion 551 and a first groove portion 552.

[0050] The first connecting portion 551 connects the back magnetic yoke portion 21 in the stacking direction on the outer peripheral surface 512 of the portion of the back magnetic yoke stack 51 that includes the iron chip 20 in the extending direction. The first connecting portion 551 is formed, for example, by welding the back magnetic yoke portions 21 stacked in the stacking direction together.

[0051] Observing the stacked iron core 1 along the axial direction, the first groove portion 552 is located on one side 3252 of the iron chip 20 in the direction of extension of the first connecting portion 551, which is opposite to the first direction in the direction from one end edge 252 to the other end edge 262 in the iron chip 20, and extends on the outer peripheral surface 512 of the back magnetic yoke stack portion 51 along the stacking direction of the back magnetic yoke stack portion 51.

[0052] In addition, such as Figure 3 As shown, when viewing the stacked iron core 1 along the axial direction, the first groove portion 552 is arranged in the circumferential direction on the outer peripheral surface 512 of the back magnetic yoke stacked portion 51, separated by the slit stacked portion 53 and the first connecting portion 551.

[0053] (Manufacturing method of laminated iron core)

[0054] Reference Figures 5 to 7 The manufacturing method S1 of the laminated iron core according to an exemplary embodiment 1 of the present invention will be described. Figure 5 This is a flowchart illustrating the manufacturing method S1 of the laminated iron core 1 according to Embodiment 1. Figure 6 This is the punching drawing for steel plate 9. Figure 7 This diagram illustrates the lamination and cutting processes.

[0055] The manufacturing method S1 of the laminated iron core 1 is as follows: An iron chip forming component 10, which extends in a strip shape in one direction, is deformed in a spiral shape while being wound in the width direction, thus manufacturing a... Figure 1 The cylindrical laminated iron core 1 extends along axis Q as shown.

[0056] More specifically, the manufacturing method S1 of the laminated iron core 1 includes a punching process S11, a lamination process S12, a cutting process S13, and a connecting process S14.

[0057] In the blanking process S11, such as Figure 6As shown, an iron chip forming component 10 is formed by punching a sheet-shaped steel plate 9, which is a magnetic material. Specifically, a die is punched on the steel plate 9. Figure 6 Regions R1, R2, and R3 are indicated by the diagonal lines. A toothed portion 12 is formed in region R1 of the punched steel plate 9. A slit portion 13 is formed in region R2 of the punched steel plate 9, extending from one end face of the back magnetic yoke portion 11 in the aforementioned width direction to the other side of the aforementioned width direction. An end face of the back magnetic yoke portion 11 on the other side of the aforementioned width direction and a pair of recesses 15A and 15B are formed in region R3 of the punched steel plate 9.

[0058] like Figure 6 As shown, the iron chip forming component 10 obtained by punching steel plate 9 has a back magnetic yoke 11, a plurality of teeth 12, a plurality of slits 13 and a pair of recesses 15.

[0059] The back magnetic yoke 11 is a plate-shaped portion extending in the aforementioned direction. A plurality of teeth 12 protrude from the back magnetic yoke 11 toward one side in the aforementioned width direction.

[0060] The plurality of slit portions 13 extend from one end face of the aforementioned width direction to the other side of the aforementioned width direction between a pair of adjacent teeth 12A, 12B in the aforementioned one direction at the back magnetic yoke portion 11.

[0061] A pair of recesses 15 are located at the end of the back magnetic yoke 11 on the opposite side of the aforementioned width direction. The pair of recesses 15 includes recess 15A and recess 15B.

[0062] Next, in the lamination process S12, as Figure 7 As shown, the iron chip forming member 10 is deformed to one side of the aforementioned width direction and wound in a spiral shape, and the back magnetic yoke portion 11, tooth portion 12, slit portion 13, and recess portion 15 are overlapped and stacked in the axial direction. In addition, the stacking direction of the iron chip forming member 10 can be either one side or the other side of the thickness direction of the iron chip forming member 10.

[0063] Next, in the cutting process S13, as Figure 7 As shown, with the iron chip forming components 10 stacked in the aforementioned axial direction, an iron chip 20 is formed by cutting between one recess 15A and the other recess 15B of a pair of recesses 15 through the cutting line CT. Furthermore, in the iron chip forming component 10, the slit portion 13 is located between one recess 15A and the other recess 15B of the pair of recesses 15, thus allowing the iron chip 20 to be easily cut from the iron chip forming component 10.

[0064] Next, in the joining step S14, the recess 15A near the cut end of the core piece 20 is joined by welding the back yoke portions 11 in the stacking direction on the outer circumferential surface 512 of the back yoke stacking portion 51 formed by stacking the back yoke portions 11 in the above-mentioned axial direction. Thus, the first joining portion 551 of the laminated core 1 shown in FIG. 6 is formed. Figures 1 to 4 The first joining portion 551 of the laminated core 1 shown in FIG. 6 is formed.

[0065] By the above-mentioned manufacturing method S1 of the laminated core 1, the laminated core 1 shown in FIG. 6 is obtained. Figures 1 to 4 In the above-mentioned manufacturing method S1 of the laminated core 1, the first joining portion 551 joining the back yoke portions 21 in the stacking direction is formed on the outer circumferential surface 512 of the back yoke stacking portion 51 near the cut end of the core piece 20. Thus, the warping of the above-mentioned end of the core piece 20 can be prevented.

[0066] In the above-mentioned structure, in the state where the core piece forming member 10 is stacked in the axial direction in a spiral shape, the recess 15A of one of the pair of recesses 15 and the recess 15B of the other are cut, thereby forming the core piece 20. That is, the core piece forming member 10 in the state of being stacked in the axial direction in a spiral shape is cut into the core piece 20 and the remaining portion R50 after the core piece 20 is cut out.

[0067] In the core piece 20, the recess 15A near the cut end can be used as a formation portion of a joining portion joined by welding the back yoke portions 21 in the stacking direction. By welding in the above-mentioned formation portion, the above-mentioned joining portion can be inhibited from protruding from the outer circumferential surface 512 of the back yoke stacking portion 51 in the radial direction outward, or the protrusion size can be inhibited.

[0068] In addition, the recess 15B is located near the cut end of the remaining portion R50. The recess 15B near the cut end of the remaining portion R50 can be used as a formation portion of a joining portion in the remaining portion R50. That is, when the remaining portion R50 is stacked in the axial direction in a spiral shape to manufacture another core piece 20 as mentioned above, the recess 15B can be used as a formation portion of the first joining portion 551.

[0069] Thus, the generation of a scrap between the core piece 20 and the remaining portion R50 can be inhibited.

[0070] Thus, according to the above-mentioned structure, in the manufacturing process of the laminated core 1, the portion discarded when the core piece 20 is cut out can be reduced.

[0071] Further, from other viewpoints, the following is described. In the laminated core 1 described above, the first connecting portion 551 is located on the outer peripheral surface 512 of the portion of the one-side end portion 251 in the extension direction of the core piece 20 in the back yoke laminated portion 51. Therefore, it is possible to prevent warping of the one-side end portion 251 in the extension direction of the core piece 20.

[0072] Further, in the structure described above, on the outer peripheral surface 512 of the back yoke laminated portion 51, the first groove portion 552 is located in the direction opposite to the first direction in the core piece 20 from the one-side end edge 252 toward the other-side end edge 262 with respect to the first connecting portion 551 with the one-side end edge 252 in the extension direction of the core piece 20 interposed therebetween. Further, the first groove portion 552 extends on the outer peripheral surface 512 of the back yoke laminated portion 51 in the stacking direction of the back yoke laminated portion 51.

[0073] The punching step S11 of the manufacturing method S1 of the laminated core 1 described above forms a pair of recesses 15 arranged at a predetermined interval on the core piece forming member 10 at the end portion on the other side in the width direction of the back yoke portion 21 described above.

[0074] Then, in the stacking step S12, the core piece forming member 10 is wound and stacked in a spiral shape, and in the cutting step S13, the core piece forming member 10 is cut at a predetermined length to obtain the core pieces 20 constituting the laminated body 50. In the cutting step S13, when the core piece forming member 10 is cut between the pair of recesses 15 arranged at two, the recess 15A on the core piece 20 side can be used for the formation of the first connecting portion 551. On the other hand, the recess 15B of the portion R50 of the core piece forming member 10 remaining after the core piece is cut can also be used for the formation of a connecting portion of a laminated body constituted by other core pieces.

[0075] Therefore, in the case where the core pieces 20 constituting the laminated body 50 are cut from the core piece forming member 10 with the one-side end edge 252 as a boundary, it is possible to cut out other core pieces constituting another laminated body from the remaining core piece forming member without generating a scrap.

[0076] Therefore, according to the structure described above, it is possible to obtain the laminated core 1 in which the portion discarded when the core pieces 20 constituting the laminated body 50 are cut out from the core piece forming member 10 can be reduced during the manufacturing process of the laminated core 1.

[0077] (Embodiment 2)

[0078] (Structure of Laminated Core)

[0079] Reference Figure 8 An exemplary laminated core 2 of Embodiment 2 of the present application is described. Figure 8is a perspective view showing the schematic structure of the laminated core 2 of Embodiment 2. The laminated core 2 of Embodiment 2 differs from the laminated core 1 of Embodiment 1 in that it also has a second connecting portion and a second groove portion. Hereinafter, the same reference numerals are assigned to the same structures as those of Embodiment 1, and the description thereof is omitted, and only the different portions from those of Embodiment 1 are described.

[0080] As shown in Figure 8 , the second connecting portion 651 connects the back yoke portion 21 in the stacking direction on the outer peripheral surface 512 of the portion of the back yoke laminated portion 51 that includes the other side end portion 261 in the extension direction of the core piece 20. The second connecting portion 651 can be implemented, for example, by welding the back yoke portions 21 stacked in the stacking direction in the stacking direction.

[0081] When the laminated core 2 is viewed in the axial direction, the second groove portion 652 is located, with respect to the second connecting portion 651, in the direction opposite to the second direction, which is the direction in the core piece 20 from the other side end edge 262 toward the one side end edge 252, across the other side end edge 262 in the extension direction of the core piece 20, and extends on the outer peripheral surface 512 of the back yoke laminated portion 51 in the stacking direction of the back yoke laminated portion 51.

[0082] Therefore, in the case where the core pieces 20 constituting the laminated body 50 are cut out from the core piece forming member 10 with the other side end edge 262 as a boundary, another core piece constituting another laminated body can be cut out from the remaining core piece forming member without generating a scrap.

[0083] Therefore, according to the above structure, the laminated core 1 in which the portion that is discarded when the core pieces 20 constituting the laminated body 50 are cut out from the core piece forming member 10 can be reduced during the manufacturing process of the laminated core 1 can be obtained.

[0084] (Embodiment 3)

[0085] (Structure of Laminated Core)

[0086] With reference to Figure 9 and Figure 10 , an exemplary laminated core 3 of Embodiment 3 of the present application is described. Figure 9 is a perspective view showing the schematic structure of the laminated core 3 of Embodiment 3. Figure 10 is a plan view showing the schematic structure of the laminated core 3 shown in Figure 9 .

[0087] The laminated core 3 of Embodiment 3 differs from the laminated core 2 of Embodiment 2 in that it has: a plurality of connecting portions 30 including the first connecting portion 551 and the second connecting portion 651; a plurality of slot portions 40 including the first slot portion 552 and the second slot portion 652; and the positioning slot portion 71. Hereinafter, the same reference signs are assigned to the same structures as those of Embodiment 2 and the description thereof is omitted, and only the portions different from those of Embodiment 2 are described.

[0088] In addition, in the following description, the portion of the core piece forming member 10 including the back yoke portion 11 located between the adjacent slit portions 13 and the region of the tooth portion 12 protruding from the portion to one side in the width direction and the number of the regions when counted are referred to as "segments". In addition, the portion of the core piece 20 constituting the laminated core 3 including the back yoke portion 21 located between the adjacent slit portions 23 and the region of the tooth portion 22 protruding from the portion to the radially inner side of the spiral and the number of the regions when counted are also referred to as "segments".

[0089] The core piece 20 is formed by winding the core piece forming member 10 in a spiral shape with 48 segments per turn and in multiple turns. That is, when the laminated core 3 is viewed in the axial direction, one turn of the circumferential direction of the core piece 20 of the laminated body 50 constituting the laminated core 3 includes 48 segments.

[0090] As shown in Figs. 1 and 2, the laminated core 3 has: six connecting portions 30 including the first connecting portion 551 and the second connecting portion 651; six slot portions 40 including the first slot portion 552 and the second slot portion 652; and the positioning slot portion 71. Figure 9 Figure 10 As shown in Figs. 1 and 2, the laminated core 3 has: six connecting portions 30 including the first connecting portion 551 and the second connecting portion 651; six slot portions 40 including the first slot portion 552 and the second slot portion 652; and the positioning slot portion 71.

[0091] The positioning slot portion 71 extends on the outer circumferential surface 512 of the back yoke laminated portion 51 in the stacking direction of the back yoke laminated portion 51. The depth of the positioning slot portion 71 is greater than the depths of the first slot portion 552 and the second slot portion 652.

[0092] According to the above structure, the positioning of the laminated core 3 can be easily performed, for example, by clamping a jig or the like in the positioning slot portion 71.

[0093] In addition, when the laminated core 3 is viewed in the axial direction, the slot portions 40 are arranged on the outer circumferential surface of the laminated core 3 in the circumferential direction with the slit laminated portions 53 interposed between the connecting portions 30.

[0094] Therefore, in the core piece forming member 10, in the case where the slit portion 23 is located in the vicinity of the one end portion 251 of the core piece 20 in the extending direction of the core piece 20, the core piece 20 can be easily cut out from the core piece forming member 10 in the manufacturing process of the laminated core 3.

[0095] ​When the back yoke stack 51 is viewed in the axial direction, the plurality of connecting portions 30 are arranged in the circumferential direction on the outer circumferential surface 512 of the back yoke stack 51 and connect the back yoke stack 51 in the stacking direction. The plurality of connecting portions 30 include, in addition to the first connecting portion 551 and the second connecting portion 651, a first intermediate connecting portion 31, a second intermediate connecting portion 32, a third intermediate connecting portion 33, and a fourth intermediate connecting portion 34. Thus, the stack 50 can be more reliably connected in the stacking direction by the plurality of connecting portions 30.

[0096] When the back yoke stack 51 is viewed in the axial direction, the plurality of connecting portions 30 are arranged in the circumferential direction on the outer circumferential surface 512 of the back yoke stack 51 and connect the back yoke stack 51 in the stacking direction. The plurality of connecting portions 30 include, in addition to the first connecting portion 551 and the second connecting portion 651, a first intermediate connecting portion 31, a second intermediate connecting portion 32, a third intermediate connecting portion 33, and a fourth intermediate connecting portion 34. Thus, the stack 50 can be more reliably connected in the stacking direction by the plurality of connecting portions 30.

[0097] Thus, the plurality of connecting portions 30 are arranged separately from the plurality of connecting portions 30, and therefore, in the manufacturing process of the laminated core 3, the recesses for forming the connecting portions 30 and the recesses for forming the connecting portions 30 are arranged in the core piece forming member 10. Therefore, in the manufacturing process of the laminated core 3, the core piece 20 can be cut out by cutting the recesses for forming the connecting portions 30 and the recesses for forming the connecting portions 30 in the core piece forming member 10. Thus, the degree of freedom of the position at which the core piece 20 is cut out is improved.

[0098] The advantages of the laminated core 3 will be described more specifically with reference to the manufacturing method of the existing laminated core 903 and the manufacturing method of the laminated core 3.

[0099] (Manufacturing method of existing laminated core)

[0100] Referring to Figures 11 to 13 The manufacturing method of the existing laminated core 903 will be described. Figure 11 is a plan view of a core piece forming member 910 used to manufacture the existing laminated core 903. Figure 12 is a stacking pattern table of the existing laminated core 903. Figure 13 is a plan view of a core piece forming member 910 used to manufacture the existing laminated core 903. The existing laminated core 903 differs from the laminated core 3 of the embodiment in that the laminated core 3 of the embodiment 3 has a plurality of connecting portions 40, and in contrast, the existing laminated core 903 does not have such connecting portions.

[0101] The stack 950 of the existing laminated core 903 is composed of core pieces 920 stacked in a spiral shape. The core pieces 920 are cut out from the core piece forming member 910.Figure 12 The illustrated layering pattern table indicates the number of turns of winding of the spiral core piece 920 and the numbers of the sections in the above-mentioned number of turns. As Figure 13 As illustrated, the core piece forming member 910 includes a back yoke portion 911, a plurality of tooth portions 912, a plurality of slit portions 913, and a recess portion 915.

[0102] The core piece 920 is formed by Figure 13 The core piece forming member 910 illustrated is wound in a spiral shape a plurality of times with 48 sections as one turn, from the first section of the first turn to the 42nd section of the nth turn. The same number is assigned to the sections of the core piece 905 in the layering direction. In addition, in Figures 11 to 13 In the core piece 920, the same number is assigned to the sections of the core piece forming member 910 corresponding to the sections of the core piece 920.

[0103] The laminated core 903 has a plurality of linking portions 930. In Figure 11 In the core piece 920, the same number is assigned to the sections of the core piece forming member 910 corresponding to the sections of the core piece 920. Figure 12 In the core piece 920, the same number is assigned to the sections of the core piece forming member 910 corresponding to the sections of the core piece 920.

[0104] As illustrated, the plurality of linking portions 930 are located in the sections of Nos. 1, 9, 17, 25, 33, and 41. The plurality of linking portions 930 correspond to Figure 11 the recess portions 915 of the core piece forming member 910 illustrated. In Figure 13 In the core piece 920, the sections of the recess portions 915 corresponding to the plurality of linking portions 930 are shown by hatching. Figure 13 The above-mentioned pattern of the sections is the same in the first turn, the second turn,..., and the nth turn of the first stage. In addition, the second stage and subsequent stages also have the same pattern of the sections as the first stage. In addition, in order to prevent warping of the one side end portion 951 and the other side end portion 961 of the core piece 920 in the extension direction, in the laminated core 903, the linking portions 930 are located in the section of No. 1 where the one side end portion 951 of the core piece 920 is located and the section of No. 41 where the other side end portion 961 is located.

[0105] Therefore, when the laminated core 903 of the first stage and the second stage is manufactured in accordance with the pattern table described above,

[0106] and Figure 12 Figure 12 Figure 13 ​​In the cross-sectional line shown in FIG. 9, in each of the laminated cores 903, the 42nd to 48th sections of the n-th coil of the final coil become the edge material W. The same applies to the case where the edge material W is generated after the third stage.

[0107] (Method for manufacturing laminated core)

[0108] Referring again to Figure 9 and Figure 10 , and referring to Figure 14 and Figure 15 , a method for manufacturing the laminated core 3 of Embodiment 3 will be described. Figure 14 is a lamination pattern table of the laminated core 3 of Embodiment 3. Figure 15 is a plan view showing the core sheet forming member 10 used to manufacture the laminated core 3 of Embodiment 3.

[0109] In Figure 10 , the numbers of the sections where the plurality of link portions 30 are located are shown with double outlines. In addition, the numbers of the sections where the plurality of groove portions 40 are located are shown with single outlines. In addition, in Figure 14 , the sections where the plurality of link portions 30 are located are shown with dotted outlines. The plurality of link portions 30 correspond to the recesses 15 of the core sheet forming member 10 shown in Figure 15 . In the lamination pattern table shown in , the sections where the plurality of groove portions 40 are located are shown with dotted outlines. The plurality of groove portions 40 correspond to the recesses 15 of the core sheet forming member 10 shown in

[0110] . Figure 14 The pattern described in Figure 14 shows the winding of the spiral of the core sheet 20 and the numbers of the sections in the winding. In the pattern table described in Figure 14 , the sections where the plurality of link portions 30 are located are shown with dotted outlines. The plurality of link portions 30 correspond to the recesses 15 of the core sheet forming member 10 shown in Figure 15 . In the lamination pattern table described in Figure 15 , the sections of the recesses 15 corresponding to the plurality of link portions 30 are shown with cross-sectional lines.

[0111] In Figure 10 , the first link portion 551 located at the one end portion 251 in the extending direction of the core sheet 20 is located at the 2nd section. That is, the first coil of the core sheet 20 starts from the 2nd. In addition, the first groove portion 552 is located at the 1st section. That is, the first groove portion 552 is located at the head of the 2nd coil of the core sheet 20.

[0112] Next, in the first turn of the core piece 20, the first connecting portion 551 is located at the 9th section next to the connecting portion 30. Thereafter, the connecting portion 30 is provided at the 17th, 26th, 33rd, and 41st sections. Next, the second turn starts from the 1st section. Thus, in the core piece 20, the 2nd, 9th, 17th, 26th, 33rd, and 41st sections, which correspond to the plurality of connecting portions 30, are provided with the recess 15. Further, in the core piece 20, the sections adjacent to the sections where the connecting portions 30 are located are also provided with the recess 15. That is, the 1st, 10th, 18th, 25th, 34th, and 42nd sections of the core piece 20, which correspond to the plurality of slot portions 40, are provided with the recess 15. Figure 15 In the core piece forming member 10 shown in the drawing, the 2nd, 9th, 17th, 26th, 33rd, and 41st sections of the core piece 20, which correspond to the plurality of connecting portions 30, are provided with the recess 15. Further, in the core piece forming member 10, the sections adjacent to the sections where the connecting portions 30 are located in the core piece 20 are also provided with the recess 15. That is, the 1st, 10th, 18th, 25th, 34th, and 42nd sections of the core piece 20, which correspond to the plurality of slot portions 40, are provided with the recess 15.

[0113] From the second turn to the nth turn, the same as the first turn is performed except that the first section is used as the starting point. Further, as described above, the recess 15 is formed at the first section. Further, the 9th section where the other end portion 261 of the nth turn, which is the final turn, of the core piece 20 is located ends. The second connecting portion 651 is located at the 9th section. Thus, by cutting the core piece forming member 10 between the 9th section of the nth turn of the nth core piece 20 and the section next to the 9th section, the nth core piece 20 and the nth+1 core piece 20 are separated. The section next to the 9th section is used as the 2nd section of the first turn of the nth+1 core piece 20.

[0114] According to the above structure, the 9th section of the final turn of the nth core piece 20 and the 2nd section of the first turn of the nth+1 core piece 20 are provided with the recess 15, respectively. Thus, the recess 15 can be used as a portion where the connecting portion is formed. Thus, the connecting portion 30 can be formed at both end portions of the core piece 20 in the extending direction, and the generation of the scrap can be suppressed between the last section of the nth core piece 20 and the first section of the nth+1 core piece 20. Further, according to the above structure, the laminated core 3 can be continuously produced while suppressing the generation of the scrap. Further, the manufacturing method of the laminated core 903 described above is only an example of illustrating the advantages of the laminated core 3. That is, the laminated core 3 can not only solve the problems of the above-described conventional laminated core 903, but also widely solve the problem of suppressing the generation of the scrap. Figures 11 to 13

[0115] Further, from another viewpoint, in the laminated core 3, when the laminated core 3 is viewed in the above-described axial direction, the first intermediate connecting portion 31 is located at a position which is symmetric with respect to the first connecting portion 551 with the axis Q as the center point. That is, the first intermediate connecting portion 31 is located at the 26th section in the example of the above-described embodiment.

[0116] ​When the laminated core 3 is viewed in the axial direction, the second intermediate connecting portion 32 is located at a point symmetric position with respect to the second connecting portion 651 with the axis Q as the center point. That is, the first intermediate connecting portion 31 is located at the 33rd segment in the example of the above-described embodiment.

[0117] In the example of the above-described embodiment, the third intermediate connecting portion 33 is located at the 17th segment. In the example of the above-described embodiment, the fourth intermediate connecting portion 34 is located at the 41st segment.

[0118] In the example of the above-described embodiment, the first slot portion 552 is located at the 1st segment. In the example of the above-described embodiment, the second slot portion 652 is located at the 10th segment.

[0119] In the example of the above-described embodiment, the first intermediate slot portion 41 is located at the 25th segment. In the example of the above-described embodiment, the second intermediate slot portion 42 is located at the 34th segment. In the example of the above-described embodiment, the third intermediate slot portion 43 is located at the 18th segment. In the example of the above-described embodiment, the fourth intermediate slot portion 44 is located at the 44th segment.

[0120] In the example of the above-described embodiment, the number of segments located between the first connecting portion 551 and the second connecting portion 651 is the same as the number of segments located between the first intermediate connecting portion 31 and the second intermediate connecting portion 32, and is "6" in the circumferential direction of the laminated core 3.

[0121] Therefore, the number of teeth located between the first connecting portion 551 and the second connecting portion 651 is the same as the number of teeth located between the first intermediate connecting portion 31 and the second intermediate connecting portion 32, and is "6" in the circumferential direction of the laminated core 3.

[0122] In the above-described structure, the number of teeth located between the first connecting portion 551 and the second connecting portion 651 is the same as the number of teeth located between the first intermediate connecting portion 31 and the second intermediate connecting portion 32, which are located at point symmetric positions with respect to the first connecting portion 551 and the second connecting portion 651, in the circumferential direction of the laminated core 50.

[0123] Therefore, the connecting portions located at the point symmetric positions are well balanced with each other and connect the back yoke portions 21 in the stacking direction, and thus the laminated core 3 is less likely to be deformed.

[0124] Further, from another viewpoint, in the laminated core 3, the number of the plurality of connection portions 30 is six, which is an even number. Further, when the laminated core is viewed in the axial direction, the plurality of connection portions 30 has, as a third connection portion, a first intermediate connection portion 31 which is located at a position symmetrical to the first connection portion 551 with the axis Q as a center point. Further, when the laminated core is viewed in the axial direction, the plurality of connection portions 30 has, as a third connection portion, a second intermediate connection portion 32 which is located at a position symmetrical to the second connection portion 651 with the axis Q as a center point.

[0125] In the above-described structure, in the laminated core 3 of the cylindrical body, the first connection portion 551 or the second connection portion 651 and the above-described third connection portion are located at positions symmetrical to each other with the axis Q as a center point, and thus the laminated core 3 is less likely to be deformed.

[0126] (Other Embodiments)

[0127] The above-described embodiments are merely examples for implementing the present application. Therefore, the present application is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments without departing from the gist of the present application.

[0128] In the above-described embodiments, the laminated core 2, 3 has a plurality of connection portions and a plurality of slot portions. However, the number of the connection portions and the number of the slot portions can each be one. For example, in Embodiment 2, either one of the first connection portion and the first slot portion or the second connection portion and the second slot portion can be omitted.

[0129] In the above-described embodiments, when the laminated core 1 is viewed in the axial direction, the first slot portion 552 is located on the outer peripheral surface 512 of the back yoke laminated portion 51 in the circumferential direction in alignment with the first connection portion 551 with the slit laminated portion 53 interposed therebetween. However, the first slot portion can be provided in the circumferential direction in alignment with the first connection portion with the slit laminated portion interposed therebetween.

[0130] In the above-described embodiments, the core piece forming member 10 has the recess 15 in each of the sections arranged in one direction at a predetermined interval. However, in the core piece forming member, the recess can be formed in each of the sections arranged in one direction at a predetermined interval. Further, the recess can be formed in each of the sections. Thus, the degree of freedom in forming the sections of the connection portions is increased.

[0131] In the above-described embodiments, the slit laminated portion 53 laminates a plurality of slit portions 23 in the above-described thickness direction. Here, the shape of each of the plurality of slit portions is not particularly limited. The slit portion can be, for example, any one of a straight line shape, a curved line shape, or a bent shape. Further, in the slit laminated portion, the shapes of two slit portions adjacent to each other in the laminating direction can be different.

[0132] In the above-described embodiment 3, the linking portion 30, the slot portion 40, and the recessed portion 15 are located in a specific segment shown in Figure 9 、 Figure 10 、 Figure 14 and Figure 15 . However, in the laminated core, the positions of the linking portion, the slot portion, and the recessed portion are not limited to the specific segment shown in Figure 9 、 Figure 10 、 Figure 14 and Figure 15 .

[0133] For example, in the above-described embodiment 3, one turn of the circumferential direction of the core piece 20 includes 48 segment regions, which include a portion of the back yoke portion 11 located between the adjacent slit portions 13 in the core piece forming member 10, and the tooth portion 12 protruding from the above-mentioned portion to one side in the above-mentioned width direction. However, the number of segments of one turn of the circumferential direction of the core piece can be greater than 48, or can be less than 48. One turn of the circumferential direction of the core piece can be composed of an arbitrary number of segments.

[0134] For example, in the above-described embodiment 3, the first intermediate linking portion 31 is located in the 26th segment, and on the other hand, the first intermediate slot portion 41 of the segment located next to the first intermediate linking portion 31 is located in the 25th segment. However, the position of the first intermediate linking portion and the position of the first intermediate slot portion can be interchanged. In addition, the positions of the second intermediate linking portion to the fourth intermediate linking portion and the positions of the second intermediate slot portion to the fourth intermediate slot portion can be exchanged, respectively.

[0135] In the above-described embodiment 3, the laminated core 3 has the positioning slot portion 71. However, the laminated core can not have the positioning slot portion.

[0136] In addition, a motor having the laminated core 1, 2, or 3 of each of the above-described embodiments also falls within the scope of the present application. With reference to Figure 16 , a motor 91 having the laminated core 3 is exemplarily described. Figure 16 is a cross-sectional view showing the schematic structure of the motor 91 which is an exemplary embodiment of the present application.

[0137] As shown in Figure 16As shown, the motor 91 has a rotor 92 as a rotor, the laminated core 3 as a stator, a housing 94, and a shaft 95. The rotor 92 has a through-hole 92a extending along the axis Q. The shaft 95 is fixed to the rotor 92 in a state of penetrating the through-hole 92a in the axial direction. The rotor 92 is rotatably positioned in the radial inner side of the laminated core 3 with the axis Q as the center together with the shaft 95. That is, the motor 91 is a so-called inner rotor type motor. In addition, the rotor 92 has a magnet insertion hole 92b extending in parallel with the through-hole 92a. A magnet 96 is positioned in the magnet insertion hole 92b.

[0138] The laminated core 3 is housed in the housing 94. The stator coil 93 is wound around the laminated core 3.

[0139] According to the above-described motor 91, in the manufacturing process of the above-described motor, generation of the edge material of the core piece can be suppressed. In addition, the above-described motor 91 has the laminated core 3 as a stator. However, the above-described motor 91 can also have the laminated core 1 or the laminated core 2 as a stator. In addition, the motor can also have a laminated core as a rotor. That is, the laminated core of each of the above-described embodiments can constitute at least one of a stator and a rotor of a motor. That is, the motor has a stator and a rotor. At least one of the above-described stator and the above-described rotor has the above-described laminated core.

[0140] (Configuration Example)

[0141] Further, the present technology can also employ the following structure.

[0142] (1) A laminated core having a cylindrical shape extending along an axis, which is obtained by laminating core pieces in a thickness direction, wherein the core pieces each have: a plate-like back yoke portion extending in a spiral shape with the axis as a center; a plurality of tooth portions protruding from the back yoke portion toward a radially inner side of the spiral; and a plurality of slit portions extending from an inner peripheral end surface of the back yoke portion toward a radially outer side of the spiral between a pair of tooth portions adjacent in an extending direction among the plurality of tooth portions. The laminated core has: a back yoke laminated portion which is obtained by laminating the back yoke portions in the thickness direction; a plurality of tooth laminated portions which are obtained by laminating the plurality of tooth portions in the thickness direction, are arranged in a circumferential direction, and protrude from an inner peripheral surface of the back yoke laminated portion toward a radially inner side; and a plurality of slit laminated portions which are obtained by laminating the plurality of slit portions in the thickness direction, are arranged in the circumferential direction, and extend from an inner peripheral end surface of the back yoke laminated portion toward a radially outer side between a pair of the tooth laminated portions adjacent in the circumferential direction. The laminated core has: a first connecting portion connecting the back yoke portions in a laminating direction on an outer peripheral surface of a portion including one side end portion in the extending direction of the core piece in the back yoke laminated portion; and a first groove portion, which, when the laminated core is viewed in an axial direction, is located in a direction opposite to a first direction in which the core piece extends from the one side end portion toward the other side end portion, with respect to the first connecting portion with the one side end edge of the core piece interposed, and extends in the laminating direction of the back yoke laminated portion on the outer peripheral surface of the back yoke laminated portion.

[0143] (2) In the laminated core described in (1), further comprising: a second connecting portion connecting the back yoke portions in the laminating direction on an outer peripheral surface of a portion including the other side end portion in the extending direction of the core piece in the back yoke laminated portion; and a second groove portion, which, when the laminated core is viewed in the axial direction, is located in a direction opposite to a second direction in which the core piece extends from the other side end portion toward the one side end portion, with respect to the second connecting portion with the other side end edge of the core piece interposed, and extends in the laminating direction of the back yoke laminated portion on the outer peripheral surface of the back yoke laminated portion, the first groove portion, the first connecting portion, the second connecting portion, and the second groove portion being arranged in the first direction on the outer peripheral surface of the back yoke laminated portion in order when the laminated core is viewed in the axial direction.

[0144] (3) The laminated core described in (2) above, having: a plurality of linking portions that are arranged in a circumferential direction on an outer circumferential surface of the back yoke laminated portion and link the back yoke laminated portion in a stacking direction when the back yoke laminated portion is viewed in the axial direction; and a plurality of slot portions that are arranged in the circumferential direction on the outer circumferential surface of the back yoke laminated portion with respect to the plurality of linking portions and extend in the stacking direction of the back yoke laminated portion when the back yoke laminated portion is viewed in the axial direction, the plurality of linking portions including the first linking portion and the second linking portion, and the plurality of slot portions including the first slot portion and the second slot portion.

[0145] (4) The laminated core described in (3) above, having: a first intermediate linking portion that is located at a position symmetrical with respect to the first linking portion about the axis as a center point when the laminated core is viewed in the axial direction; and a second intermediate linking portion that is located at a position symmetrical with respect to the second linking portion about the axis as a center point when the laminated core is viewed in the axial direction, the number of teeth located between the first linking portion and the second linking portion in the circumferential direction of the laminated core being the same as the number of teeth located between the first intermediate linking portion and the second intermediate linking portion.

[0146] (5) The laminated core described in (3) or (4) above, the number of the plurality of linking portions being even, and further having a third linking portion that is located at a position symmetrical with respect to the first linking portion or the second linking portion about the axis as a center point when the laminated core is viewed in the axial direction.

[0147] (6) The laminated core described in any one of (3) to (5) above, having a positioning slot portion that extends in the stacking direction of the back yoke laminated portion on the outer circumferential surface of the back yoke laminated portion, the depth of the positioning slot portion being greater than the depths of the first slot portion and the second slot portion.

[0148] (7) The laminated core described in any one of (3) to (6) above, the slot portions being arranged in the circumferential direction on the outer circumferential surface of the laminated core with the linking portions in between via the slit laminated portion when the laminated core is viewed in the axial direction.

[0149] (8) A motor having: a stator; and a rotor,

[0150] At least one of the stator and the rotor has the laminated core described in any one of (1) to (7) above.

[0151] (9) A method of manufacturing a laminated core that makes a core piece forming member extending in a band shape in one direction into a spiral shape while deforming one side of the core piece forming member toward one side in a width direction, and manufactures a cylindrical laminated core extending in an axial direction. The method of manufacturing the laminated core includes: a punching step of forming the core piece forming member by punching a steel plate in a plate shape, the core piece forming member having a back yoke portion extending in the plate shape in the one direction, a plurality of tooth portions protruding from the back yoke portion toward the one side in the width direction, a plurality of slit portions extending from an end surface of the back yoke portion on the one side in the width direction toward the other side in the width direction between a pair of tooth portions adjacent in the one direction among the plurality of tooth portions, and a pair of recessed portions at an end portion of the back yoke portion on the other side in the width direction; a laminating step of deforming the core piece forming member toward the one side in the width direction and winding in a spiral shape, and laminating the back yoke portion, the tooth portion, the slit portion, and the recessed portion so as to overlap in the axial direction, respectively; a cutting step of cutting between one of the pair of recessed portions and the other recessed portion in a state where the core piece forming member is laminated in the axial direction, thereby forming a core piece; and a joining step of joining, in the recessed portion near the cut end portion of the core piece, by joining the back yoke portion in the lamination direction on an outer peripheral surface of a back yoke laminated portion made by laminating the back yoke portion in the axial direction.

[0152] Production availability

[0153] The present application can be used for a laminated core configured by winding a core piece forming member in a band shape in a spiral shape, a motor, and a method of manufacturing a laminated core.

Claims

1. A laminated core having a cylindrical shape extending along an axis, which is obtained by laminating core pieces in a state that a back yoke portion, a tooth portion, and a slit portion are overlaid in a thickness direction, wherein the core piece has: the plate-shaped back yoke portion extending in a spiral shape with the axis as a center; a plurality of the tooth portions projecting from the back yoke portion toward a radially inner side of the spiral; and a plurality of the slit portions extending from an inner peripheral end surface of the back yoke portion toward a radially outer side of the spiral between a pair of tooth portions adjacent in an extending direction, the laminated core is characterized in that the laminated body has: a back yoke laminated portion which is the back yoke portion laminated in the thickness direction; a plurality of tooth laminated portions which are the plurality of tooth portions laminated in the thickness direction and arranged in a circumferential direction and projecting from an inner peripheral surface of the back yoke laminated portion toward a radially inner side; and a plurality of slit laminated portions which are the plurality of slit portions laminated in the thickness direction and arranged in the circumferential direction and extending from an inner peripheral end surface of the back yoke laminated portion toward a radially outer side between a pair of the tooth laminated portions adjacent, the laminated core has: a first connecting portion connecting the back yoke portions in a laminating direction on an outer peripheral surface of a portion including one side end portion in the extending direction of the core piece in the back yoke laminated portion; and a first groove portion, which, when the laminated core is viewed in an axial direction, is located in a direction opposite to a first direction in which the core piece faces from the one side end edge toward the other side end edge with respect to the first connecting portion across the one side end edge in the extending direction of the core piece and extends on the outer peripheral surface of the back yoke laminated portion in the laminating direction of the back yoke laminated portion, and further has: a second connecting portion connecting the back yoke portions in the laminating direction on an outer peripheral surface of a portion including the other side end portion in the extending direction of the core piece in the back yoke laminated portion; and a second groove portion, which, when the laminated core is viewed in the axial direction, is located in a direction opposite to a second direction in which the core piece faces from the other side end edge toward the one side end edge with respect to the second connecting portion across the other side end edge in the extending direction of the core piece and extends on the outer peripheral surface of the back yoke laminated portion in the laminating direction of the back yoke laminated portion, the first groove portion, the first connecting portion, the second connecting portion, and the second groove portion are arranged in the first direction on the outer peripheral surface of the back yoke laminated portion in order when the laminated core is viewed in the axial direction, and the laminated core has: a plurality of connecting portions arranged in the circumferential direction on the outer peripheral surface of the back yoke laminated portion when the back yoke laminated portion is viewed in the axial direction and connecting the back yoke laminated portion in the laminating direction; and a plurality of groove portions arranged in the circumferential direction on the outer peripheral surface of the back yoke laminated portion with respect to the plurality of connecting portions when the back yoke laminated portion is viewed in the axial direction and extending in the laminating direction of the back yoke laminated portion, the plurality of connecting portions include the first connecting portion and the second connecting portion, and the plurality of groove portions include the first groove portion and the second groove portion. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The laminated core according to claim 1, characterized by ​ ​ ​ ​ ​ 3. The laminated core according to claim 2, characterized by ​ ​ ​ ​ The plurality of groove portions include the first groove portion and the second groove portion.

4. The laminated core according to claim 3, characterized by has: a first intermediate connecting portion which, when the laminated core is viewed in the axial direction, is located at a position symmetrical to the first connecting portion with the axis as a center point; and a second intermediate connecting portion which, when the laminated core is viewed in the axial direction, is located at a position symmetrical to the second connecting portion with the axis as a center point, the number of teeth located between the first connecting portion and the second connecting portion in the circumferential direction of the laminated core is the same as the number of teeth located between the first intermediate connecting portion and the second intermediate connecting portion.

5. The laminated core according to claim 3, characterized in that the number of the plurality of connecting portions is an even number, further has a third connecting portion which, when the laminated core is viewed in the axial direction, is located at a position symmetrical to the first connecting portion or the second connecting portion with the axis as a center point.

6. The laminated core according to claim 3, characterized in that has a positioning groove portion which extends on an outer circumferential surface of the back yoke laminated portion in a laminating direction of the back yoke laminated portion, the depth of the positioning groove portion is greater than the depths of the first groove portion and the second groove portion.

7. The laminated core according to any one of claims 3 to 6, characterized in that when the laminated core is viewed in the axial direction, the groove portions are arranged on an outer circumferential surface of the laminated core in the circumferential direction with the connecting portions and the slit laminated portion interposed therebetween.

8. A motor characterized by, has: a stator; and a rotor, at least one of the stator and the rotor has the laminated core according to any one of claims 1 to 6.

9. A method of manufacturing a laminated core, which manufactures a cylindrical laminated core extending in an axial direction by deforming a core piece forming member extending in a direction in a strip shape toward one side in a width direction and winding it in a spiral shape, the method of manufacturing a laminated core according to claim 9, characterized by comprising: The punching process forms the core piece forming member by punching a plate-shaped steel sheet, wherein the core piece forming member has a back yoke portion extending in the direction in a plate shape, a plurality of tooth portions protruding from the back yoke portion toward one side in the width direction, a plurality of slit portions extending from an end surface of the back yoke portion on one side in the width direction toward the other side in the width direction between a pair of tooth portions adjacent in the direction in the plurality of tooth portions, and a pair of recessed portions at an end portion of the back yoke portion on the other side in the width direction; a laminating step of deforming the core piece forming member toward one side in the width direction and winding it in a spiral shape, and laminating the back yoke portion, the tooth portion, the slit portion, and the recessed portion so as to overlap in the axial direction, respectively; a cutting step of cutting between one of the pair of recessed portions and the other recessed portion in a state where the core piece forming member is laminated in the axial direction, thereby forming a core piece; and a connecting step of connecting, in the recessed portion close to the cut end portion of the core piece, the back yoke portion by joining the back yoke portion in a laminating direction on an outer circumferential surface of a back yoke laminated portion formed by laminating the back yoke portion in the axial direction.

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