Laminated core, motor, and method for producing laminated core

Abstract

To provide: a laminated core capable of reducing the amount of waste generated when cutting out core pieces that make up a laminate from a core piece forming material in the producing process of the laminated core; a motor; and a method for producing a laminated core.SOLUTION: A laminated core 1 has a first connecting part 551 that connects a back yoke part 21 in a stacking direction on an outer peripheral surface 512 of a portion of a back yoke stacking part that includes one side end part 251 in an extension direction of a core piece 20, and a first groove part 552 that extends in the stacking direction of the back yoke stacking portion on the outer peripheral surface 512 of the back yoke stacking part, and is located in the opposite direction to the first direction, which is the direction from one side end edge 252 to the other side end edge 262 of the core piece 20, relative to the first connecting part 551, when viewed in an axial direction of the laminated core 1, across the one side end edge 252 in the extension direction of the core piece 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a laminated core, a motor, and a method for manufacturing a laminated core. [Background technology]

[0002] A manufacturing method is known for manufacturing a laminated core by winding a strip-shaped core piece forming member while deforming it into a spiral shape. For example, Patent Document 1 discloses a manufacturing method for manufacturing a spiral type rotating machine core by stacking a comb-shaped sheet having a strip-shaped core back portion and a number of parallel teeth portions by winding it into a spiral shape while the strip-shaped core back portion is positioned radially outward of the spiral and the parallel teeth portion is positioned radially inward of the spiral. In the manufacturing method of Patent Document 1, when the axial length of the laminate obtained by stacking the comb-shaped sheets reaches a predetermined value, the laminate is separated from the comb-shaped sheet. After the laminate is separated from the comb-shaped sheet in this way, a finishing process such as welding, heat treatment, straightening, surface finishing, cutting, deburring, or cleaning is performed on the laminate as necessary. Through the above steps, a spiral type rotating machine core is completed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 010409 Summary of the Invention [Problem to be solved by the invention]

[0004] A laminated core manufactured by deforming and winding a strip-shaped core piece forming member into a spiral shape has a lamination body made up of spirally wound and stacked core pieces. In such a laminated core lamination body, it is necessary to fix the ends of the spirally wound and stacked core pieces to prevent them from curling up.

[0005] Meanwhile, in the manufacturing process of the laminated core, the core pieces that constitute the laminate are cut out from a core piece forming member in accordance with the axial height 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 material.

[0006] The present invention aims to provide a laminated core, a motor, and a method for manufacturing a laminated core that can reduce the amount of waste generated when cutting out the core pieces that make up the laminate from a core piece forming material during the manufacturing process of the laminated core. [Means for solving the problem]

[0007] A laminated core according to an exemplary embodiment of the present invention is a laminated core having a cylindrical laminate extending along the axis, in which core pieces having a plate-shaped back yoke portion extending spirally around an axis, a plurality of teeth portions protruding radially inward of the spiral from the back yoke portion, and a plurality of slit portions extending radially outward of the spiral from the inner end face of the back yoke portion between a pair of teeth portions adjacent to each other in the extension direction among the plurality of teeth portions are stacked in a state in which the back yoke portion, the teeth portions, and the slit portions overlap in the thickness direction, forming a cylindrical laminate extending along the axis. The laminated body includes a cylindrical back yoke laminated portion in which the back yoke portions are laminated in the thickness direction, a plurality of teeth laminated portions in which the teeth portions are laminated in the thickness direction and are arranged in the circumferential direction and protrude radially inward from an inner peripheral surface of the back yoke laminated portion, and a plurality of slit laminated portions in which the slit portions are laminated in the thickness direction and are arranged in the circumferential direction and extend radially outward from an inner peripheral end surface of the back yoke laminated portion between adjacent pairs of the teeth laminated portions. The laminated core includes a first coupling portion that couples the back yoke portions in the stacking direction on an outer peripheral surface of a portion of the back yoke laminated portion that includes one side end in the extension direction of the core pieces, and a first groove portion that is located in the opposite direction to a first direction that is a direction from the one side end edge to the other side end edge of the core pieces with respect to the first coupling portion, when viewed in the axial direction of the laminated core, and extends in the stacking direction of the back yoke laminated portion on the outer peripheral surface of the back yoke laminated portion.

[0008] A method for manufacturing a laminated core according to an exemplary embodiment of the present invention is a method for manufacturing a laminated core in which a core piece forming member extending in one direction in a band shape is deformed to one side in the width direction while being wound in a spiral to manufacture a cylindrical laminated core extending along an axis. The method for manufacturing the laminated core includes a punching process for forming the core piece forming member having a plate-shaped back yoke portion extending in the one direction, a plurality of teeth portions protruding from the back yoke portion to one side in the width direction, a plurality of slit portions extending from an end face on one side in the width direction of the back yoke portion to the other side in the width direction between a pair of teeth portions adjacent in the one direction among the plurality of teeth portions, and a pair of recesses located at an end face on the other side in the width direction of the back yoke portion; The method includes a lamination process in which the core piece forming member is deformed to one side and wound spirally, and the back yoke portion, the teeth portion, the slit portion and the recesses are stacked and laminated in the axial direction; a cutting process in which, with the core piece forming member stacked in the axial direction, cutting between one of the pair of recesses and the other recess is performed to form a core piece; and a connecting process in which the back yoke portion is connected by joining the back yoke portion in the stacking direction at a recess near the cut end of the core piece on the outer peripheral surface of the back yoke laminated portion in which the back yoke portion is stacked in the axial direction. Effect of the Invention

[0009] According to the present invention, it is possible to reduce the amount of material that is wasted when cutting out the core pieces that make up the laminates from the core piece forming member in the process of manufacturing a laminated core. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a laminated core according to the first embodiment. [Diagram 2] FIG. 2 is a plan view showing a schematic configuration of the laminated core shown in FIG. [Diagram 3] FIG. 3 is a partial enlarged view of part III shown in FIG. [Figure 4]FIG. 4 is an exploded side view showing the laminated core. [Diagram 5] FIG. 5 is a flowchart showing a method for manufacturing the laminated core according to the first embodiment. [Figure 6] FIG. 6 is a diagram of a punched steel plate. [Figure 7] FIG. 7 is a diagram illustrating the laminating step and the cutting step. [Figure 8] FIG. 8 is a perspective view showing a schematic configuration of a laminated core according to the second embodiment. [Figure 9] FIG. 9 is a perspective view showing a schematic configuration of a laminated core according to the third embodiment. [Figure 10] FIG. 10 is a plan view showing a schematic configuration of the laminated core shown in FIG. [Figure 11] FIG. 11 is a plan view showing a core piece forming member for manufacturing a conventional laminated core. [Figure 12] FIG. 12 is a lamination pattern table for a conventional laminated core. [Figure 13] FIG. 13 is a plan view showing a core piece forming member for manufacturing a laminated core. [Figure 14] FIG. 14 is a lamination pattern table for the laminated core according to the third embodiment. [Figure 15] FIG. 15 is a plan view showing a core piece forming member for manufacturing a laminated core according to the third embodiment. [Figure 16] FIG. 16 is a cross-sectional view showing a schematic configuration of a motor according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals and their description will not be repeated. Furthermore, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of each component.

[0012] In the following description, the direction in which the helix of the core pieces extending in a helical shape and the axis Q of the cylinder in the cylindrical laminated body extend is referred to as the axial direction, and the direction perpendicular to the axis Q is referred to as the radial direction. In the following description, the helical shape of the core pieces is also referred to as "spiral".

[0013] In the following description, the direction of the plate thickness of a plate-shaped member is referred to as the thickness direction of the member. "Looking at a member in the thickness direction" means that the thickness direction and the line of sight are the same. For example, "Looking at a core piece forming member in the thickness direction" means looking at the surface of the core piece forming member from a position separated from the core piece forming member in the thickness direction.

[0014] In the following description, the term "same" does not only refer to the case where something is strictly the same, but also includes the case where something is substantially the same.

[0015] In addition, in the following description, the expressions "fixed," "coupled," "connected," "joined," "attached," and the like (hereinafter referred to as "fixed, etc.") include not only cases where members are directly fixed, etc. to each other, but also cases where members are fixed, etc. via other members. In other words, in the following description, the expression "fixed, etc." includes the meaning of direct and indirect fixation, etc. of members to each other.

[0016] (Embodiment 1) (Laminated core configuration) A laminated core 1 according to a first exemplary embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. Fig. 1 is a perspective view showing a schematic configuration of the laminated core 1. Fig. 2 is a plan view showing a schematic configuration of the laminated core 1. Fig. 3 is a partial enlarged view of part III shown in Fig. 2. Fig. 4 is an exploded side view showing the laminated core 1.

[0017] The laminated core 1 has a cylindrical laminate 50 extending along an axis Q. The laminate 50 is composed of core pieces 20 that are spirally wound and laminated in the lamination direction.

[0018] The core piece 20 has a back yoke portion 21, a plurality of teeth portions 22, and a plurality of slit portions 23.

[0019] The back yoke portion 21 is a plate-like portion extending in a spiral shape centered on the axis Q. The teeth portions 22 protrude from the back yoke portion 21 inward in the radial direction of the spiral.

[0020] As shown in Figures 2 and 3, the multiple slit portions 23 extend radially outward of the spiral from the inner end surface 211 of the back yoke portion 21 between a pair of teeth portions 22A, 22B that are adjacent to each other in the extension direction among the multiple teeth portions 22.

[0021] The core pieces 20 are laminated in a state in which the back yoke portions 21, the teeth portions 22, and the slit portions 23 overlap each other in the thickness direction.

[0022] The laminate 50 has a back yoke laminated portion 51, a plurality of teeth laminated portions 52, and a plurality of slit laminated portions 53.

[0023] The back yoke laminated portion 51 has a cylindrical shape in which the back yoke portions 21 are laminated in the thickness direction. The teeth laminated portions 52 have the teeth portions 22 laminated in the thickness direction, lined up in the circumferential direction, and protrude radially inward from an inner circumferential surface 511 of the back yoke laminated portion 51.

[0024] The multiple slit laminated portions 53 are formed by stacking multiple slit portions 23 in the thickness direction, lining up in the circumferential direction, and extending radially outward from the inner surface 511 of the back yoke laminated portion 51 between each pair of adjacent teeth laminated portions 52A, 52B.

[0025] The laminated core 1 has a first connecting portion 551 and a first groove portion 552 .

[0026] The first connecting portion 551 connects the back yoke portions 21 in the stacking direction on an outer peripheral surface 512 of a portion of the back yoke laminated portion 51 that includes one side end portion 251 in the extension direction of the core piece 20. The first connecting portion 551 is formed, for example, by welding the back yoke portions 21 stacked in the stacking direction in the stacking direction.

[0027] When viewed in the axial direction of the laminated core 1, the first groove portion 552 is located relative to the first connecting portion 551, sandwiching one side 3252 in the extension direction of the core piece 20, in the opposite direction to the first direction, which is the direction from one side edge 252 to the other side edge 262 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.

[0028] Furthermore, as shown in FIG. 3, when viewing the laminated core 1 in the axial direction, the first groove portion 552 is located on the outer peripheral surface 512 of the back yoke laminated portion 51, aligned circumferentially with the first connecting portion 551 across the slit laminated portion 53.

[0029] (Manufacturing method of laminated core) A method S1 for manufacturing a laminated core according to an exemplary embodiment 1 of the present invention will be described with reference to Fig. 5 to Fig. 7. Fig. 5 is a flowchart showing the method S1 for manufacturing a laminated core 1 according to embodiment 1. Fig. 6 is a diagram showing punching of a steel plate 9. Fig. 7 is a diagram for explaining a laminating step and a cutting step.

[0030] The manufacturing method S1 of the laminated core 1 is a method of manufacturing a cylindrical laminated core 1 extending along an axis Q, as shown in FIG. 1, by deforming a core piece forming member 10 extending in a strip shape in one direction to one side in the width direction and winding it spirally.

[0031] More specifically, the manufacturing method S1 of the laminated core 1 includes a punching step S11, a laminating step S12, a cutting step S13, and a connecting step S14.

[0032] In the punching process S11, as shown in Fig. 6, a plate-shaped steel plate 9, which is a magnetic material, is punched out to form a core piece forming member 10. Specifically, regions R1, R2, and R3 shown by diagonal lines in Fig. 6 are punched out in the steel plate 9. Teeth portions 12 are formed by punching out region R1 of the steel plate 9. Slit portions 13 extending from an end face on one side in the width direction of the back yoke portion 11 to the other side in the width direction are formed by punching out region R2 of the steel plate 9. The end face on the other side in the width direction of the back yoke portion 11 and a pair of recesses 15A, 15B are formed by punching out region R3 of the steel plate 9.

[0033] As shown in FIG. 6, an iron core piece forming member 10 obtained by punching a steel plate 9 has a back yoke portion 11, a plurality of teeth portions 12, a plurality of slit portions 13, and a pair of recesses 15.

[0034] The back yoke portion 11 is a plate-like portion extending in the one direction. The teeth portions 12 protrude from the back yoke portion 11 to one side in the width direction.

[0035] The multiple slit portions 13 extend from an end face on one side in the width direction of the back yoke portion 11 to the other side in the width direction between a pair of teeth portions 12A, 12B adjacent to each other in the one direction among the multiple teeth portions 12.

[0036] The pair of recesses 15 are located at the other end in the width direction of the back yoke portion 11. The pair of recesses 15 include a recess 15A and a recess 15B.

[0037] 7, the core piece forming member 10 is deformed toward one side in the width direction and wound in a spiral shape, and the back yoke portions 11, teeth portions 12, slit portions 13 and recesses 15 are stacked in the axial direction. The stacking direction of the core piece forming member 10 may be either one side or the other side in the thickness direction of the core piece forming member 10.

[0038] 7, in a state in which the core piece forming members 10 are stacked in the axial direction, they are cut along cutting lines CT between one recess 15A and the other recess 15B of the pair of recesses 15 to form the core pieces 20. Note that in the core piece forming members 10, the slit portions 13 are located between one recess 15A and the other recess 15B of the pair of recesses 15, so that the core pieces 20 can be easily cut out from the core piece forming members 10.

[0039] Next, in a connecting step S14, the back yoke parts 11 are joined by welding in the stacking direction on the outer peripheral surface 512 of the back yoke laminated part 51 in which the back yoke parts 11 are stacked in the axial direction at the recesses 15A near the cut ends of the core pieces 20. This forms the first connecting part 551 of the laminated core 1 shown in Figures 1 to 4.

[0040] 1 to 4 is obtained by the above-described manufacturing method S1 of the laminated core 1. In the manufacturing method S1 of the laminated core 1, a first connecting portion 551 that connects the back yoke portion 21 in the stacking direction on the outer circumferential surface 512 of the back yoke laminated portion 51 is formed in the recess 15A near the cut end of the core piece 20. This makes it possible to prevent the end of the core piece 20 from curling up.

[0041] Furthermore, in the above-described configuration, with the core piece forming member 10 stacked spirally in the axial direction, the core piece 20 is formed by cutting between one recess 15A and the other recess 15B of the pair of recesses 15. That is, the core piece forming member 10 stacked spirally in the axial direction is cut into the core piece 20 and the remaining portion R50 from which the core piece 20 is cut out.

[0042] In the core piece 20, the recess 15A near the cut end can be used as a forming portion of a connecting portion that connects the back yoke portion 21 by joining it in the stacking direction by welding or the like. By performing welding at the forming portion, it is possible to prevent the connecting portion from protruding radially outward from the outer circumferential surface 512 of the back yoke stacked portion 51 during welding, or to reduce the protruding dimension.

[0043] In addition, recess 15B is located near the cut end of remaining portion R50. Recess 15B near the cut end of remaining portion R50 can be used as a forming portion of a connecting portion in remaining portion R50. That is, when another core piece 20 is manufactured by stacking remaining portion R50 spirally in the axial direction as described above, recess 15B can be used as a forming portion of first connecting portion 551.

[0044] Therefore, the generation of scrap material between the core piece 20 and the remaining portion R50 can be suppressed.

[0045] Therefore, according to the above-mentioned configuration, the amount of waste generated when cutting out the core pieces 20 during the manufacturing process of the laminated core 1 can be reduced.

[0046] From another viewpoint, it is as follows: In the above-described laminated core 1, the first connecting portion 551 is located on the outer peripheral surface 512 of the back yoke laminated portion 51 at a portion including one side end 251 in the extension direction of the core piece 20. Therefore, it is possible to prevent the one side end 251 in the extension direction of the core piece 20 from curling up.

[0047] In the above-described configuration, on the outer peripheral surface 512 of the back yoke laminated portion 51, the first groove portion 552 is located with respect to the first connecting portion 551, across one side edge 252 in the extension direction of the core piece 20, in the opposite direction from the one side edge 252 toward the other side edge 262 of the core piece 20. The first groove portion 552 extends on the outer peripheral surface 512 of the back yoke laminated portion 51 in the lamination direction of the back yoke laminated portion 51.

[0048] In the punching step S11 of the manufacturing method S1 of the laminated core 1 described above, a pair of recesses 15 are formed in the core piece forming member 10 at the other end of the back yoke portion 21 in the width direction, the pair being arranged at a predetermined interval.

[0049] Thereafter, in a lamination step S12, the core piece forming member 10 is spirally wound and laminated, while in a cutting step S13, the core piece forming member 10 is cut to a predetermined length to obtain the core pieces 20 that constitute the laminate 50. In the cutting step S13, when the core piece forming member 10 is cut between two adjacent pairs of recesses 15, the recess 15A on the iron core piece 20 side can be used to form the first connecting portion 551. Meanwhile, in the core piece forming member 10, the recess 15B of the portion R50 that remains after the core pieces are cut can also be used to form the connecting portion of the laminate constituted by other iron core pieces.

[0050] Therefore, when the core pieces 20 constituting the laminate 50 are cut from the core piece forming member 10 along one side edge 252, another core piece constituting another laminate can be cut out from the remaining core piece forming member without producing any scrap material.

[0051] Therefore, according to the above-mentioned configuration, a laminated core 1 can be obtained that can reduce the portions that are discarded when cutting out the core pieces 20 that make up the laminates 50 from the core piece forming members 10 during the manufacturing process of the laminated core 1.

[0052] (Embodiment 2) (Laminated core configuration) A laminated core 2 according to an exemplary embodiment 2 of the present invention will be described with reference to Fig. 8. Fig. 8 is a perspective view showing a schematic configuration of the laminated core 2 according to embodiment 2. The laminated core 2 according to embodiment 2 differs from the laminated core 1 according to embodiment 1 in that it further has a second connecting portion and a second groove portion. In the following, the same components as those in embodiment 1 are given the same reference numerals and their description will be omitted, and only the portions that differ from the configuration of embodiment 1 will be described.

[0053] 8, the second connecting portion 651 connects the back yoke portions 21 in the stacking direction on the outer peripheral surface 512 of a portion of the back yoke laminated portion 51 that includes the other end portion 261 in the extension direction of the core piece 20. The second connecting portion 651 can be realized, for example, by welding the back yoke portions 21 that are stacked in the stacking direction in the stacking direction.

[0054] When viewed in the axial direction of the laminated core 2, the second groove portion 652 is located with respect to the second connecting portion 651, sandwiching the other side edge 262 in the extension direction of the core piece 20, in the opposite direction to the second direction, which is the direction from the other side edge 262 to the one side edge 252 of the core piece 20, and extends on the outer peripheral surface 512 of the back yoke laminate portion 51 in the stacking direction of the back yoke laminate portion 51.

[0055] Therefore, when the core pieces 20 constituting the laminate 50 are cut from the core piece forming member 10 at the other side edge 262 as the boundary, another core piece constituting another laminate can be cut out from the remaining core piece forming member without producing any scrap material.

[0056] Therefore, according to the above-mentioned configuration, a laminated core 1 can be obtained that can reduce the portions that are discarded when cutting out the core pieces 20 that make up the laminates 50 from the core piece forming members 10 during the manufacturing process of the laminated core 1.

[0057] (Embodiment 3) (Laminated core configuration) A laminated core 3 according to an exemplary embodiment 3 of the present invention will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a perspective view showing a schematic configuration of the laminated core 3 according to embodiment 3. Fig. 10 is a plan view showing a schematic configuration of the laminated core 3 shown in Fig. 9.

[0058] The laminated core 3 according to the third embodiment differs from the laminated core 2 according to the second embodiment in that it has a plurality of connecting portions 30 including a first connecting portion 551 and a second connecting portion 651, a plurality of groove portions 40 including a first groove portion 552 and a second groove portion 652, and a positioning groove portion 71. In the following, the same configurations as those in the second embodiment are given the same reference numerals and the description is omitted, and only the portions that differ from the configuration in the second embodiment will be described.

[0059] In the following description, a region including a portion of the back yoke portion 11 located between adjacent slit portions 13 in the core piece forming member 10 and the teeth portions 12 protruding from said portion to one side in the width direction, and the number of said regions, are referred to as a "section." Similarly, a region including a portion of the back yoke portion 21 located between adjacent slit portions 23 in the core pieces 20 constituting the laminated core 3 and the teeth portions 22 protruding from said portion radially inward of the spiral, and the number of said regions, are referred to as a "section."

[0060] The core pieces 20 are formed by spirally winding the core piece forming member 10 multiple times, with 48 sections constituting one turn. In other words, when the laminated core 3 is viewed in the axial direction, one circumferential turn of the core pieces 20 constituting the laminations 50 of the laminated core 3 includes 48 sections.

[0061] As shown in Figures 9 and 10, the laminated core 3 has six connecting portions 30 including a first connecting portion 551 and a second connecting portion 651, six groove portions 40 including a first groove portion 552 and a second groove portion 652, and a positioning groove portion 71.

[0062] The positioning groove 71 extends in the lamination direction of the back yoke laminated portion 51 on the outer circumferential surface 512 of the back yoke laminated portion 51. The positioning groove 71 is deeper than the first groove 552 and the second groove 652.

[0063] According to the above-mentioned configuration, for example, by hooking a jig or the like into the positioning groove portion 71, the laminated core 3 can be easily positioned.

[0064] Furthermore, when the laminated core 3 is viewed in the axial direction, the grooves 40 are located on the outer circumferential surface of the laminated core 3, side by side with the connecting portions 30 in the circumferential direction, with the slit laminated portions 53 interposed therebetween.

[0065] Therefore, when the slit portion 23 is located in the vicinity of one side end portion 251 in the extension direction of the core piece 20 in the core piece forming member 10, the core piece 20 can be easily cut out from the core piece forming member 10 during the manufacturing process of the laminated core 3.

[0066] The multiple connecting portions 30 are positioned side by side in the circumferential direction on the outer peripheral surface 512 of the back yoke laminated portion 51 when the back yoke laminated portion 51 is viewed in the axial direction, and connect the back yoke laminated portion 51 in the stacking direction. The multiple connecting portions 30 include 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 in addition to a first connecting portion 551 and a second connecting portion 651. This allows the stack 50 to be more reliably connected in the stacking direction by the multiple connecting portions 30.

[0067] The multiple groove portions 40 are positioned side by side in the circumferential direction with respect to the multiple connecting portions 30 on the outer circumferential surface 512 of the back yoke laminated portion 51 when the back yoke laminated portion 51 is viewed in the axial direction, and extend in the stacking direction of the back yoke laminated portion 51. In addition to the first groove portion 552 and the second groove portion 652, the multiple groove portions 40 include a first intermediate groove portion 41, a second intermediate groove portion 42, a third intermediate groove portion 43, and a fourth intermediate groove portion 44.

[0068] In this way, since the multiple grooves 40 are lined up with the multiple connecting portions 30, respectively, in the manufacturing process of the laminated core 3, the recesses for forming the connecting portions 30 and the recesses for forming the grooves 40 are positioned side by side in the core piece forming member 10. Therefore, in the manufacturing process of the laminated core 3, the core pieces 20 can be cut out by cutting the core piece forming member 10 between the recesses for forming the connecting portions 30 and the recesses for forming the grooves 40. This improves the degree of freedom in the positions from which the core pieces 20 are cut out.

[0069] The advantages of such a laminated core 3 will be described in more detail with reference to a conventional method for manufacturing a laminated core 903 and a method for manufacturing a laminated core 3 in that order.

[0070] (Conventional manufacturing method for laminated core) A method for manufacturing a conventional laminated core 903 will be described with reference to Fig. 11 to Fig. 13. Fig. 11 is a plan view showing a core piece forming member 910 for manufacturing the conventional laminated core 903. Fig. 12 is a lamination pattern table for the conventional laminated core 903. Fig. 13 is a plan view showing a core piece forming member 910 for manufacturing the laminated core 903. The difference between the conventional laminated core 903 and the laminated core 3 according to the third embodiment is that the laminated core 3 according to the third embodiment has a plurality of grooves 40, whereas the conventional laminated core 903 does not have such grooves.

[0071] A laminate 950 of a conventional laminated core 903 is composed of spirally laminated core pieces 920. The core pieces 920 are cut out from a core piece forming member 910. The lamination pattern table shown in FIG. 12 indicates the number of turns of the spiral core piece 920 and the section numbers in the number of turns. As shown in FIG. 13, the core piece forming member 910 has a back yoke portion 911, a plurality of teeth portions 912, a plurality of slit portions 913, and a recess 915.

[0072] Core piece 920 is formed by spirally winding core piece forming member 910 shown in Fig. 13 a number of times, from section 1 of the first turn to section 42 of the nth turn, with 48 sections making up one turn. The same numbers are assigned to sections located in the lamination direction in core piece 905. Note that in Figs. 11 to 13, the same numbers are assigned to sections of laminated core 903 and core piece forming member 910 that correspond to the sections of core piece 920.

[0073] The laminated core 903 has a plurality of connecting portions 930. In Fig. 11, the section numbers in which the plurality of connecting portions 930 are located are indicated by double frames. In addition, in the lamination pattern table shown in Fig. 12, dashed frames indicate the sections in which the plurality of connecting portions 930 are located. The connecting portions 930 are located at one end 951 in the extension direction of the core piece 920. In addition, the connecting portions 930 are located at the other end 961 in the extension direction of the core piece 920.

[0074] As shown in Fig. 11, the multiple connecting portions 930 are located in sections 1, 9, 17, 25, 33, and 41. The multiple connecting portions 930 correspond to the recesses 915 of the core piece forming member 910 shown in Fig. 13. In Fig. 13, the sections of the recesses 915 corresponding to the multiple connecting portions 930 are indicated by shading.

[0075] The above-mentioned section pattern is the same for the first, second, ..., nth round of the first unit. The second and subsequent units also have the same section pattern as the first unit. In order to prevent curling of one side end 951 and the other side end 961 in the extension direction of the core piece 920, in the laminated core 903, a connecting portion 930 is located in section 1 where one side end 951 in the extension direction of the core piece 920 is located, and in section 41 where the other side end 961 is located.

[0076] For this reason, when the first and second laminated cores 903 are manufactured according to the pattern table shown in Fig. 12, in each laminated core 903, sections 42 to 48 of the final nth turn become scraps W, as shown by hatching in Fig. 12 and Fig. 13. The occurrence of these scraps W also occurs in the third and subsequent cores.

[0077] (Manufacturing method of laminated core) A method for manufacturing the laminated core 3 according to embodiment 3 will be described with reference to Figures 9 and 10 again, as well as Figures 14 and 15. Figure 14 is a lamination pattern table for the laminated core 3 according to embodiment 3. Figure 15 is a plan view showing a core piece forming member 10 for manufacturing the laminated core 3 according to embodiment 3.

[0078] In Fig. 10, the section numbers in which multiple connecting portions 30 are located are indicated by double frames. Also, the section numbers in which multiple groove portions 40 are located are indicated by single frames. Also, in the stacking pattern table shown in Fig. 14, the dashed frame indicates the section in which the connecting portion 30 corresponding to the recess 15 is located, and the circle indicates the section in which the groove portion 40 corresponding to the recess 15 of the core piece forming member 10 shown in Fig. 15 is located.

[0079] The pattern table shown in FIG. 14 shows the turns of the spiral of the core piece 20 and the section numbers in the turns. In the pattern table shown in FIG. 14, a circle represents a section in which a groove portion corresponding to the recess 15 is located, and a broken-line frame represents a section in which a connecting portion corresponding to the recess 15 is located. A double frame means that a connecting portion is located in that section, and a single frame means that a groove portion is located in that section. In the lamination pattern table shown in FIG. 14, a broken-line frame represents a section in which a plurality of connecting portions 30 are located. The plurality of connecting portions 30 correspond to the recesses 15 of the core piece forming member 10 shown in FIG. 15. In FIG. 15, the sections of the recesses 15 corresponding to the plurality of connecting portions 30 are indicated by shading.

[0080] 10, the first coupling portion 551 located at one side end portion 251 in the extension direction of the core piece 20 is located in section No. 2. That is, the first turn of the core piece 20 starts from No. 2. Also, the first groove portion 552 is located in section No. 1. That is, the first groove portion 552 is located at the beginning of the second turn of the core piece 20.

[0081] Next, in the first turn of the core piece 20, the next connecting portion 30 of the first connecting portion 551 is located in the 9th section. Thereafter, connecting portions 30 are located in the 17th, 26th, 33rd, and 41st sections. The following second turn starts from the 1st section. For this reason, in the core piece forming member 10 shown in FIG. 15, recesses 15 are formed in the 2nd, 9th, 17th, 26th, 33rd, and 41st sections corresponding to the multiple connecting portions 30 in the core piece 20. In addition, in the core piece forming member 10, recesses 15 are also formed in the section adjacent to the section in the core piece 20 where the connecting portion 30 is located. That is, recesses 15 are formed in the 1st, 10th, 18th, 25th, 34th, and 42nd sections corresponding to the multiple groove portions 40 in the core piece 20.

[0082] The second to nth turns are the same as the first turn, except that they start from the first section. As described above, a recess 15 is formed in the first section. The final turn, the n+1th turn, ends with the 9th section where the other end 261 in the extension direction of the core piece 20 is located. The 9th section is where the second connecting portion 651 is located. Therefore, by cutting the core piece forming member 10 between the 9th section of the n+1th turn of the nth piece and the section following the 9th section, the nth core piece 20 and the n+1th core piece 20 are separated. The section following the 9th section is used as the 2nd section of the first turn of the n+1th core piece 20.

[0083] With the above configuration, the 9th section at the end of the final turn of the nth core piece 20 and the 2nd section at the first turn of the n+1th core piece 20 each have a recess 15. Therefore, the recess 15 can be used as a portion for forming a connecting portion. Thus, the connecting portion 30 can be formed at both ends in the extension direction of the core piece 20, and the generation of scrap material can be suppressed between the last section of the nth core piece 20 and the first section of the n+1th core piece 20. Furthermore, with the above configuration, the laminated core 3 can be continuously produced while suppressing the generation of scrap material. Note that the manufacturing method of the conventional laminated core 903 described with reference to Figs. 11 to 13 is merely an example for explaining the advantages of the laminated core 3. That is, the laminated core 3 can solve the problem of suppressing the generation of scrap material not only for the conventional laminated core 903 described above, but also for a wide range of other problems.

[0084] From another point of view, in the laminated core 3, the first intermediate connector 31 is located at a position point-symmetrical with respect to the first connector 551 about the axis Q when the laminated core 3 is viewed in the axial direction. That is, in the example of the above-mentioned embodiment, the first intermediate connector 31 is located in the 26th section.

[0085] When the laminated core 3 is viewed in the axial direction, the second intermediate connector 32 is located at a position point-symmetrical with respect to the second connector 651 about the axis Q. That is, in the example of the above-mentioned embodiment, the first intermediate connector 31 is located in the 33rd section.

[0086] In the above-mentioned embodiment example, the third intermediate connector 33 is located in section 17. In the above-mentioned embodiment example, the fourth intermediate connector 34 is located in section 41.

[0087] In the above-mentioned embodiment example, the first groove portion 552 is located in section number 1. In the above-mentioned embodiment example, the second groove portion 652 is located in section number 10.

[0088] The first intermediate groove 41 is located in section 25 in the above embodiment. The second intermediate groove 42 is located in section 34 in the above embodiment. The third intermediate groove 43 is located in section 18 in the above embodiment. The fourth intermediate groove 44 is located in section 44 in the above embodiment.

[0089] In the above-described embodiment example, in the circumferential direction of the laminated core 3, the number of sections located between the first connecting portion 551 and the second connecting portion 651 is the same as the number of sections located between the first intermediate connecting portion 31 and the second intermediate connecting portion 32, which is "6".

[0090] Therefore, in the circumferential direction of the laminated core 3, 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 is "6".

[0091] In the above-described configuration, in the circumferential direction of the laminate 50, 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 positioned point-symmetrically with respect to the first connecting portion 551 and the second connecting portion 651 about the axis Q.

[0092] Therefore, since the back yoke portions 21 are connected in a well-balanced manner in the lamination direction by the connecting portions located at point symmetrical positions, distortion of the laminated core 3 is unlikely to occur.

[0093] From another point of view, the number of the multiple connecting portions 30 in the laminated core 3 is six, which is an even number. The multiple connecting portions 30 have a first intermediate connecting portion 31 as a third connecting portion located at a position point-symmetrical with the first connecting portion 551 about the axis Q when viewed in the axial direction of the laminated core. The multiple connecting portions 30 have a second intermediate connecting portion 32 as a third connecting portion located at a position point-symmetrical with the second connecting portion 651 about the axis Q when viewed in the axial direction of the laminated core.

[0094] In the above-described configuration, in the cylindrical laminated core 3, the first connecting portion 551 or the second connecting portion 651 and the third connecting portion are located in point-symmetric positions about the axis Q, so that distortion is less likely to occur in the laminated core 3.

[0095] (Other embodiments) Although the embodiment of the present invention has been described above, the above-mentioned embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and it is possible to carry out the above-mentioned embodiment by appropriately modifying it within the scope of the gist of the present invention.

[0096] In each of the above-described embodiments, the laminated cores 2 and 3 have a plurality of connecting portions and a plurality of groove portions. However, the number of connecting portions and the number of groove portions may each be one. For example, in embodiment 2, it is possible to omit either the first connecting portion and the first groove portion, or the second connecting portion and the second groove portion.

[0097] In each of the above-described embodiments, when the laminated core 1 is viewed in the axial direction, the first groove portion 552 is located on the outer peripheral surface 512 of the back yoke laminated portion 51, and is aligned in the circumferential direction with the first connecting portion 551 across the slit laminated portion 53. However, the first groove portion does not have to be aligned in the circumferential direction with the first connecting portion across the slit laminated portion.

[0098] In each of the above-described embodiments, the core piece forming member 10 has the recesses 15 in each of two sections arranged in one direction at a predetermined interval. However, in the core piece forming member, recesses may be formed in each of three or more sections arranged in one direction at a predetermined interval. Also, recesses may be formed in each section. This increases the degree of freedom in the sections in which the connecting portions can be formed.

[0099] In each of the above-described embodiments, the slit stacking portion 53 has a plurality of slit portions 23 stacked in the thickness direction. Here, the shape of each of the plurality of slit portions is not particularly limited. The slit portion may have, for example, any of a linear shape, a curved shape, and a bent shape. In addition, in the slit stacking portion, the shapes of two slit portions adjacent to each other in the stacking direction may not be the same.

[0100] In the above-described third embodiment, the coupling portions 30, the grooves 40, and the recesses 15 are located in the specific sections shown in Figures 9, 10, 14, and 15. However, in a laminated core, the positions of the coupling portions, the grooves, and the recesses are not limited to the specific sections shown in Figures 9, 10, 14, and 15.

[0101] For example, in the above-mentioned embodiment 3, one circumferential revolution of the core piece 20 includes 48 sections that include a portion of the back yoke portion 11 located between adjacent slit portions 13 in the core piece forming member 10 and the teeth portions 12 protruding from said portion to one side in the width direction. However, the number of sections in one circumferential revolution of the core piece may be more or less than 48. One circumferential revolution of the core piece may be composed of any number of sections.

[0102] For example, in the above-mentioned third embodiment, the first intermediate connector 31 is located in the 26th section, while the first intermediate groove 41, which is located in the section next to the first intermediate connector 31, is located in the 25th section. However, the positions of the first intermediate connector and the first intermediate groove may be interchanged. It is also possible to interchange the positions of the second intermediate connector to the fourth intermediate connector and the positions of the second intermediate groove to the fourth intermediate groove.

[0103] In the above-described third embodiment, the laminated core 3 has the positioning groove 71. However, the laminated core does not necessarily have to have the positioning groove.

[0104] Further, motors having the laminated cores 1, 2, and 3 according to the above-described embodiments are also within the scope of the present invention. A motor 91 having a laminated core 3 will be exemplarily described with reference to Fig. 16. Fig. 16 is a cross-sectional view showing a schematic configuration of a motor 91 according to an exemplary embodiment of the present invention.

[0105] As shown in FIG. 16, the motor 91 includes a rotor 92 as a rotor, a 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 while passing through the through hole 92a in the axial direction. The rotor 92 is located radially inward of the laminated core 3 and is rotatable together with the shaft 95 about the axis Q. That is, the motor 91 is a so-called inner rotor type motor. The rotor 92 also has a magnet insertion hole 92b extending parallel to the through hole 92a. The magnet 96 is located in the magnet insertion hole 92b.

[0106] The laminated core 3 is accommodated in a housing 94. A stator coil 93 is wound around the laminated core 3.

[0107] According to the above-mentioned motor 91, the generation of core piece end materials can be suppressed during the manufacturing process of the motor. The above-mentioned motor 91 has a laminated core 3 as a stator. However, the above-mentioned motor 91 may have a laminated core 1 or a laminated core 2 as a stator. The motor may also have a laminated core as a rotor. That is, the laminated core according to each of the above-mentioned embodiments can configure at least one of the stator or rotor of the motor. That is, the motor has a stator and a rotor. At least one of the stator or the rotor has the above-mentioned laminated core.

[0108] (Configuration example) The present technology can also be configured as follows.

[0109] (1) A laminated core is a laminated core having a cylindrical laminate extending along an axis, in which core pieces having a plate-shaped back yoke portion extending spirally around an axis, a plurality of teeth portions protruding radially inward of the spiral from the back yoke portion, and a plurality of slit portions extending radially outward of the spiral from the inner end face of the back yoke portion between a pair of teeth portions adjacent to each other in the extension direction among the plurality of teeth portions are stacked in a state in which the back yoke portion, the teeth portions, and the slit portions overlap in the thickness direction. The laminated body includes a cylindrical back yoke laminated portion in which the back yoke portions are laminated in the thickness direction, a plurality of teeth laminated portions in which the teeth portions are laminated in the thickness direction and are arranged in the circumferential direction and protrude radially inward from an inner peripheral surface of the back yoke laminated portion, and a plurality of slit laminated portions in which the slit portions are laminated in the thickness direction and are arranged in the circumferential direction and extend radially outward from an inner peripheral end surface of the back yoke laminated portion between adjacent pairs of the teeth laminated portions. The laminated core includes a first coupling portion that couples the back yoke portions in the stacking direction on an outer peripheral surface of a portion of the back yoke laminated portion that includes one side end in the extension direction of the core pieces, and a first groove portion that is located in the opposite direction to a first direction that is a direction from the one side end edge to the other side end edge of the core pieces with respect to the first coupling portion, when viewed in the axial direction of the laminated core, and extends in the stacking direction of the back yoke laminated portion on the outer peripheral surface of the back yoke laminated portion.

[0110] (2) The laminated core described in (1) further includes a second connecting portion that connects the back yoke portion in the stacking direction on the outer peripheral surface of a portion of the back yoke laminated portion that includes the other end portion in the extension direction of the core piece, and a second groove portion that is located in the opposite direction to a second direction that is the direction from the other end edge to the one end edge of the core piece, relative to the second connecting portion, when viewed in the axial direction of the laminated core, and extends in the stacking direction of the back yoke laminated portion on the outer peripheral surface of the back yoke laminated portion, with the other end edge in the extension direction of the core piece being sandwiched between them, and when viewed in the axial direction of the laminated core, the first groove portion, the first connecting portion, the second connecting portion, and the second groove portion are arranged in order in the first direction on the outer peripheral surface of the back yoke laminated portion.

[0111] (3) The laminated core described in (2) has a plurality of connecting portions that are positioned in a circumferential direction on the outer peripheral surface of the back yoke laminated portion when viewed in the axial direction, and connect the back yoke laminated portion in the stacking direction, and a plurality of groove portions that are positioned in a circumferential direction on the outer peripheral surface of the back yoke laminated portion when viewed in the axial direction, and extend in the stacking direction of the back yoke laminated portion, and 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.

[0112] (4) In the laminated core described in (3), when viewed in the axial direction of the laminated core, the laminated core has a first intermediate connecting portion located at a position point-symmetrical about the axis with respect to the first connecting portion, and a second intermediate connecting portion located at a position point-symmetrical about the axis with respect to the second connecting portion, when viewed in the axial direction of the laminated core, and in the circumferential direction of the laminated core, the number of teeth located between the first connecting portion and the second connecting portion is the same as the number of teeth located between the first intermediate connecting portion and the second intermediate connecting portion.

[0113] (5) In the laminated core described in (3) or (4), the number of the multiple connecting portions is an even number, and when viewed in the axial direction of the laminated core, the laminated core further has a third connecting portion that is located in a position that is point-symmetrical about the axis with respect to the first connecting portion or the second connecting portion.

[0114] (6) In a laminated core described in any one of (3) to (5), a positioning groove portion is provided on an outer peripheral surface of the back yoke laminated portion, the positioning groove portion extending in a lamination direction of the back yoke laminated portion, and the depth of the positioning groove portion is greater than the depths of the first groove portion and the second groove portion.

[0115] (7) In a laminated core described in any one of (3) to (6), the groove portion is located on the outer peripheral surface of the laminated core, circumferentially aligned with the connecting portion, sandwiching the slit laminate portion, when viewed in the axial direction of the laminated core.

[0116] (8) A motor includes a stator and a rotor, wherein at least one of the stator and the rotor includes the laminated core according to any one of (1) to (7).

[0117] (9) A method for manufacturing a laminated core includes a punching step of forming the core piece forming member having a plate-like back yoke portion extending in one direction, a plurality of teeth portions protruding from the back yoke portion to one side in the width direction, a plurality of slit portions extending from an end face on one side in the width direction of the back yoke portion to the other side in the width direction between a pair of teeth portions adjacent in the one direction among the plurality of teeth portions, and a pair of recesses located at an end face on the other side in the width direction of the back yoke portion; The method includes a lamination process in which the core piece forming member is deformed to one side and wound spirally, and the back yoke portion, the teeth portion, the slit portion and the recesses are stacked and laminated in the axial direction; a cutting process in which, with the core piece forming member stacked in the axial direction, cutting between one of the pair of recesses and the other recess is performed to form a core piece; and a connecting process in which the back yoke portion is connected by joining the back yoke portion in the stacking direction at a recess near the cut end of the core piece on the outer peripheral surface of the back yoke laminated portion in which the back yoke portion is stacked in the axial direction. [Industrial Applicability]

[0118] INDUSTRIAL APPLICABILITY The present invention can be utilized for a laminated core formed by spirally winding a band-shaped core piece forming member, a motor, and a method for manufacturing a laminated core. [Explanation of symbols]

[0119] 1, 2, 3 laminated core 9 steel plate 10 Core piece forming member 11 Back yoke 12, 12A, 12B Teeth 13 Slit section 15 Pair of recesses 15A, 15B Recess 20 Core piece 21 Back yoke 211 Inner circumference end face 22, 22A, 22B Teeth 23 Slit section 251 One side end 252 One side edge 261 Other end 262 Other side edge 30 Connecting part 31 First intermediate connector 32 Second intermediate connection 33 Third intermediate joint 34 4th intermediate connector 40 Groove 41 First intermediate groove 42 Second intermediate groove 43 Third intermediate groove 44 4th intermediate groove 50 Laminate 51 Back yoke laminated section 511 Inner surface 512 Outer surface 52, 52A, 52B Teeth stacking section 53 Slit lamination section 551 1st connection part 552 First Groove 651 2nd connection part 652 Second Groove 71 Positioning groove 91 Motor 92 Rotor 92a Through hole 92b Magnet insertion hole 93 Stator coil 94 Housing 95 Shaft 96 Magnet CT cutting line Q axis R50 Remaining

Claims

1. A plate-shaped back yoke portion extending in a spiral shape around an axis line; a plurality of teeth protruding radially inward from the back yoke portion; a plurality of slit portions extending radially outward of the spiral from an inner peripheral end surface of the back yoke portion between pairs of teeth portions adjacent to each other in an extension direction of the plurality of teeth portions; a laminated core having a cylindrical laminate extending along an axis, in which the back yoke portion, the teeth portion, and the slit portion are laminated in a state where the core pieces have an overlapping thickness direction, The laminate comprises: a cylindrical back yoke laminated portion in which the back yoke portions are laminated in the thickness direction; a plurality of teeth laminated portions, the teeth portions being laminated in the thickness direction, arranged in a circumferential direction, and protruding radially inward from an inner circumferential surface of the back yoke laminated portion; a plurality of slit laminated portions, the slit portions being laminated in the thickness direction, aligned in the circumferential direction, and extending radially outward from an inner peripheral end surface of the back yoke laminated portion between adjacent pairs of the teeth laminated portions; having The laminated core comprises: a first connecting portion that connects the back yoke portion in a stacking direction on an outer circumferential surface of a portion of the back yoke laminated portion that includes one side end portion in the extension direction of the core pieces; a first groove portion that is located with respect to the first connecting portion, across one side edge in the extension direction of the core pieces, in a direction opposite to a first direction that is a direction from the one side edge to the other side edge of the core pieces, when viewed in the axial direction of the laminated core, and that extends in the stacking direction of the back yoke laminated portion on an outer circumferential surface of the back yoke laminated portion; having Laminated core.

2. 2. The laminated core according to claim 1, a second coupling portion that couples the back yoke portion in a lamination direction on an outer circumferential surface of a portion of the back yoke laminated portion that includes the other end portion in the extension direction of the core pieces; a second groove portion that is located with respect to the second connecting portion, across the other side edge in the extension direction of the core pieces, in a direction opposite to a second direction that is a direction from the other side edge toward the one side edge of the core pieces, and that extends in the stacking direction of the back yoke laminated portion on an outer circumferential surface of the back yoke laminated portion, when viewed in the axial direction of the laminated core; and When the laminated core is viewed in the axial direction, the first groove portion, the first connecting portion, the second connecting portion, and the second groove portion are arranged in order in the first direction on an outer circumferential surface of the back yoke laminated portion. Laminated core.

3. The laminated core according to claim 2, a plurality of connecting portions which are arranged side by side in a circumferential direction on an outer circumferential surface of the back yoke laminated portion when the back yoke laminated portion is viewed in an axial direction, and which connect the back yoke laminated portions in a stacking direction; a plurality of grooves that are arranged in a circumferential direction on an outer peripheral surface of the back yoke laminated portion when the back yoke laminated portion is viewed in an axial direction, the grooves being aligned with the plurality of connecting portions and extending in a lamination direction of the back yoke laminated portion; having The plurality of connecting portions include the first connecting portion and the second connecting portion, The plurality of grooves include the first groove and the second groove. Laminated core.

4. The laminated core according to claim 3, a first intermediate connecting portion that is located at a position point-symmetrical with respect to the first connecting portion about the axis when the laminated core is viewed in the axial direction; a second intermediate connecting portion located at a position point-symmetrical with respect to the second connecting portion with respect to the axis when the laminated core is viewed in the axial direction; having In a circumferential direction of the laminated core, the number of teeth located between the first connecting portion and the second connecting portion is the same as the number of teeth located between the first intermediate connecting portion and the second intermediate connecting portion. Laminated core.

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

6. The laminated core according to claim 3, a positioning groove extending in a lamination direction of the back yoke laminated portion on an outer peripheral surface of the back yoke laminated portion, The depth of the positioning groove is greater than the depths of the first groove and the second groove. Laminated core.

7. 7. The laminated core according to claim 3, When the laminated core is viewed in the axial direction, the groove portion is located on the outer circumferential surface of the laminated core, and is aligned with the connecting portion in the circumferential direction with the slit laminated portion therebetween. Laminated core.

8. A stator; A rotor; having A motor, wherein 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 for manufacturing a laminated core, comprising the steps of: deforming a core piece forming member extending in one direction in a band shape to one side in a width direction while winding it in a spiral shape to manufacture a cylindrical laminated core extending along an axis, the method comprising the steps of: A plate-shaped back yoke portion extending in one direction; a plurality of teeth protruding from the back yoke portion to one side in the width direction; a plurality of slit portions extending from an end surface on one side in the width direction to the other side in the width direction in the back yoke portion between a pair of teeth portions adjacent to each other in the one direction among the plurality of teeth portions; a pair of recesses located at the other end of the back yoke portion in the width direction; a punching process for forming the iron core piece forming member by punching a plate-shaped steel plate; a lamination process in which the core piece forming member is deformed to one side in the width direction and wound in a spiral shape, and the back yoke portion, the teeth portion, the slit portion, and the recessed portion are respectively stacked in an axial direction; a cutting process for forming core pieces by cutting the core piece forming members between one recess and the other recess of the pair of recesses while the core piece forming members are stacked in the axial direction; a connecting step of connecting the back yoke portions by joining them in a stacking direction on an outer peripheral surface of a back yoke laminated portion in which the back yoke portions are stacked in the axial direction at recesses near the cut ends of the core pieces; Including, Manufacturing method of laminated core.

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