Laminated iron core, motor, and method for manufacturing laminated iron core

Abstract

The invention provides a laminated iron core, a motor and a manufacturing method of the laminated iron core. The laminated iron core (1) is provided with: a first connecting part (551) for connecting the back yoke part (21) in the lamination direction on the outer peripheral surface (512) of the back yoke laminated part (51) including the one-side end part (251) in the extension direction of the iron core piece (20); and a first groove section (552) which, when the laminated iron core (1) is viewed in the axial direction, is positioned in a direction opposite to a first direction, which is a direction from one end edge (252) toward the other end edge (262) of the iron core piece (20), with respect to the first connection section (551) across the one end edge (252) in the direction in which the iron core piece (20) extends. The outer peripheral surface (512) of the back yoke laminated part (51) extends along the lamination direction of the back yoke laminated part (51).

Description

Technical Field

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

[0002] There is known a manufacturing method for manufacturing a laminated core by winding a strip-shaped iron core forming component while deforming it in a spiral shape. For example, Patent Document 1 discloses a manufacturing method, which manufactures a spiral rotating machine core by stacking a comb-shaped sheet having a strip-shaped iron core back and a plurality of parallel teeth by spirally winding the comb-shaped sheet with the strip-shaped iron core back located radially outside the spiral and the parallel teeth located radially inside the spiral. In the manufacturing method of Patent Document 1, when the axial length of the stacked body obtained by stacking the comb-shaped sheets reaches a predetermined value, the stacked body is cut off from the comb-shaped sheet. In this way, after the stacked body is cut off from the comb-shaped sheet, the stacked body is subjected to finishing processes such as welding, heat treatment, correction, surface alignment, cutting, deburring or cleaning as required. Through the above processes, the spiral rotating machine core is completed.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2021 / 010409 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, the laminated core manufactured by winding a strip-shaped core forming member while deforming it in a spiral shape has a laminated body composed of core sheets wound in a spiral shape and stacked. In such a laminated body of the laminated core, in order to prevent the ends of the core sheets wound in a spiral shape and stacked from curling up, the ends of the core sheets need to be fixed.

[0008] On the other hand, in the manufacturing process of the laminated core, the core sheets constituting the laminated body are cut out from the core sheet forming member according to the height in the axial direction of the laminated core. When the core sheets are cut out from the core sheet forming member, it is desirable to suppress the generation of scrap.

[0009] An object of the present invention is to realize a laminated core, a motor, and a method for manufacturing the laminated core, which can reduce the amount of waste when cutting out core sheets constituting a laminated body from core sheet forming members during the manufacturing process of the laminated core.

[0010] Solutions to Solve Problems

[0011] A laminated iron core of an exemplary embodiment of the present invention comprises a cylindrical laminate extending along an axis line by laminating iron core sheets in a state where a back magnetic yoke portion, a tooth portion and a slit portion are overlapped in a thickness direction, wherein the iron core sheet comprises: a plate-shaped back magnetic yoke portion extending in a spiral shape with the axis line as the center; a plurality of tooth portions protruding radially inward of the spiral from the back magnetic yoke portion; and a plurality of slit portions extending radially outward from the inner peripheral end surface of the back magnetic yoke portion toward the radially outward of the spiral between a pair of tooth portions adjacent to each other in the extension direction among the plurality of tooth portions. The above-mentioned stacked body comprises: a cylindrical back yoke stacked portion, which is formed by stacking the above-mentioned back yoke portion along the above-mentioned thickness direction; a plurality of tooth stacked portions, which is formed by stacking a plurality of the above-mentioned tooth portions along the above-mentioned thickness direction, arranged in the circumferential direction, and protruding radially inward from the inner circumferential surface of the above-mentioned back yoke stacked portion; and a plurality of slit stacked portions, which is formed by stacking a plurality of the above-mentioned slit portions along the above-mentioned thickness direction, arranged in the above-mentioned circumferential direction, and extending radially outward from the inner circumferential end surface of the above-mentioned back yoke stacked portion between an adjacent pair of the above-mentioned tooth stacked portions. The above-mentioned laminated iron core comprises: a first connecting portion, which connects the above-mentioned back magnetic yoke portion in the stacking direction on the outer peripheral surface of a portion of the back magnetic yoke laminated portion including one side end portion in the extension direction of the above-mentioned iron core sheet; and a first groove portion, which, when observing the above-mentioned laminated iron core along the axial direction, is located in a direction opposite to the first direction from the one side end edge toward the other side end edge in the above-mentioned iron core sheet, separated by one side end edge in the extension direction of the above-mentioned iron core sheet, relative to the above-mentioned first connecting portion, and extends along the stacking direction of the above-mentioned back magnetic yoke laminated portion on the outer peripheral surface of the above-mentioned back magnetic yoke laminated portion.

[0012] A manufacturing method for a laminated iron core according to an exemplary embodiment of the present invention is to deform an iron core sheet forming component extending in a band shape in one direction toward one side in the width direction while spirally winding it to manufacture a cylindrical laminated iron core extending along an axis. The manufacturing method of the laminated iron core comprises: a punching step of forming the iron core sheet forming component by punching a plate-shaped steel plate, wherein the iron core sheet forming component has a plate-shaped back yoke portion extending in the one direction, a plurality of teeth 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 teeth adjacent in the one direction among the plurality of teeth, and a pair of recesses at the end of the back yoke portion located on the other side in the width direction; and a stacking step of deforming the iron core sheet forming component. The component is deformed to one side in the width direction and wound in a spiral shape, and the back yoke portion, the tooth portion, the slit portion and the recessed portion are overlapped and stacked in the axial direction respectively; a cutting step, in a state where the iron core sheet forming component is stacked along the axial direction, the recess of one of the pair of recesses is cut off from the recess of the other side, thereby forming an iron core sheet; and a connecting step, at the recess near the cut end of the iron core sheet, the back yoke portion is connected by joining the back yoke portion in the stacking direction on the outer peripheral surface of the back yoke stacked portion formed by stacking the back yoke portion along the axial direction.

[0013] Effects of the Invention

[0014] According to the present invention, in the manufacturing process of the laminated core, it is possible to reduce the amount of waste when the core sheets constituting the laminated body are cut out from the core sheet forming member. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 Yes means Figure 1 A top view showing the schematic structure of a laminated core.

[0017] Figure 3 yes Figure 2 A partial enlarged view of part III is shown.

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

[0019] Figure 5 This is a flowchart showing the method for manufacturing the laminated iron core according to the first embodiment.

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

[0021] Figure 7 It is a diagram for explaining the lamination process and the cutting process.

[0022] Figure 8 It is a perspective view showing a schematic structure of a laminated core according to the second embodiment.

[0023] Fig. 9 It is a perspective view showing a schematic structure of a laminated iron core according to the third embodiment.

[0024] Fig.10 Yes means Fig. 9 A top view showing the schematic structure of a laminated core.

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

[0026] Fig.12 This is a table of lamination patterns of existing laminated cores.

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

[0028] Fig.14 This is a lamination pattern table of the laminated iron core according to the third embodiment.

[0029] Fig.15 It is a plan view showing a core sheet forming member for manufacturing a laminated core according to the third embodiment.

[0030] Fig.16 It is a cross-sectional view showing a schematic structure of a motor according to an embodiment.

[0031] In the figure:

[0032] 1, 2, 3—laminated core, 9—steel plate, 10—iron core sheet 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 sheet, 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—the other side end portion, 262—the other side end edge, 30—connecting portion, 31—a first intermediate connecting portion, 32—a second intermediate connecting portion, 33—a third intermediate connecting portion, 34—a fourth intermediate connecting portion, 40—a groove portion, 41— First intermediate groove portion, 42—second intermediate groove portion, 43—third intermediate groove portion, 44—fourth intermediate groove portion, 50—laminated body, 51—back yoke laminated portion, 511—inner peripheral surface, 512—outer peripheral surface, 52, 52A, 52B—tooth laminated portion, 53—slit laminated portion, 551—first connecting portion, 552—first groove portion, 651—second connecting portion, 652—second groove portion, 71—positioning groove portion, 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 line, R50—remaining part. DETAILED DESCRIPTION

[0033] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same or equivalent parts in the drawings are marked with the same symbols, and their descriptions are not repeated. In addition, the sizes of the components in each figure do not faithfully express the actual sizes of the components and the size ratios of the components.

[0034] In the following description, the direction in which the spiral in the core sheet extending in a spiral shape and the axis Q of the cylinder of the cylindrical laminate extend is referred to as the axial direction, and the direction orthogonal to the axis Q is referred to as the radial direction. In the following description, the spiral shape of the core sheet is also expressed as "spiral".

[0035] In addition, in the following description, in a plate-like component, the direction of the plate thickness is referred to as the thickness direction of the component. "Observing the component along the thickness direction" means that the thickness direction is consistent with the direction of sight. For example, "observing the iron core forming component along the thickness direction" means observing the surface of the iron core forming component from a position separated from the iron core forming component in the thickness direction.

[0036] In the following description, the term “same” includes not only the case of being strictly the same but also the range that can be regarded as substantially the same.

[0037] In addition, in the following description, expressions such as "fixed", "connected", "connected", "joined", and "mounted" (hereinafter referred to as fixed, etc.) include not only cases where components are directly fixed to each other, but also cases where components are fixed via other components. That is, in the following description, expressions such as fixed include the meaning of direct and indirect fixing of components to each other.

[0038] (Implementation Method 1)

[0039] (Structure of laminated core)

[0040] Reference Figures 1 to 4 , a laminated iron core 1 according to an exemplary embodiment 1 of the present invention will be described. Figure 1 It is a perspective view showing a schematic structure of the laminated iron core 1 . Figure 2 It is a plan view showing a schematic structure of the laminated core 1 . Figure 3 yes Figure 2 A partial enlarged view of part III is shown. Figure 4 It is an exploded side view showing the laminated iron core 1 in an exploded manner.

[0041] The laminated core 1 has a cylindrical laminated body 50 extending along the axis line Q. The laminated body 50 is composed of core sheets 20 that are spirally wound and laminated in a laminating direction.

[0042] The core sheet 20 includes a back yoke portion 21 , a plurality of teeth portions 22 , and a plurality of slit portions 23 .

[0043] The back yoke portion 21 is a plate-shaped portion extending in a spiral shape centered on the axis Q. A plurality of teeth 22 protrude radially inward of the spiral from the back yoke portion 21 .

[0044] like Figure 2 and Figure 3 As shown, the plurality of slit portions 23 extend radially outward in the spiral direction from the inner peripheral end surface 211 of the back yoke portion 21 between a pair of teeth 22A and 22B adjacent to each other in the extending direction among the plurality of teeth 22 .

[0045] The core sheets 20 are stacked in a state where the back yoke portion 21 , the teeth portion 22 , and the slit portion 23 overlap each other in the thickness direction.

[0046] The laminated body 50 includes a back yoke laminated portion 51 , a plurality of teeth laminated portions 52 , and a plurality of slit laminated portions 53 .

[0047] The back yoke laminated part 51 is formed by laminating the back yoke part 21 in the thickness direction and has a cylindrical shape. The plurality of teeth laminated parts 52 are formed by laminating the plurality of teeth 22 in the thickness direction and arranged in the circumferential direction and protrude radially inward from the inner circumferential surface 511 of the back yoke laminated part 51 .

[0048] The plurality of slit stacking portions 53 are formed by stacking a plurality of slit portions 23 in the thickness direction, arranged in the circumferential direction, and extending radially outward from the inner circumferential surface 511 of the back yoke stacking portion 51 between a pair of adjacent teeth stacking portions 52A and 52B.

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

[0050] The first connection portion 551 connects the back yoke portion 21 in the stacking direction on the outer peripheral surface 512 of the back yoke stacking portion 51 including the one end portion 251 in the extending direction of the core sheet 20. The first connection portion 551 is formed by, for example, welding the stacked back yoke portions 21 in the stacking direction.

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

[0052] In addition, if Figure 3 As shown, 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 laminate portion 51 so as to be aligned with the first coupling portion 551 in the circumferential direction with the slit laminate portion 53 interposed therebetween.

[0053] (Method for manufacturing laminated core)

[0054] Reference Figures 5 to 7 , a method S1 for manufacturing a laminated core according to the exemplary embodiment 1 of the present invention will be described. Figure 5 This is a flowchart showing a method S1 for manufacturing the laminated core 1 according to the first embodiment. Figure 6 It is a blanking diagram of the steel plate 9. Figure 7 It is a diagram for explaining the lamination process and the cutting process.

[0055] The manufacturing method S1 of the laminated iron core 1 is as follows: a core sheet forming member 10 extending in a strip shape in one direction is deformed toward one side in the width direction while being spirally wound to manufacture the core sheet 1. Figure 1 A cylindrical laminated core 1 extending along an axis Q is shown.

[0056] 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 .

[0057] In the punching step S11, Figure 6As shown in FIG. 1 , the core sheet forming member 10 is formed by punching out a plate-shaped steel sheet 9 as a magnetic material. Specifically, Figure 6 The regions R1, R2 and R3 are indicated by oblique lines. The teeth 12 are formed by punching the region R1 of the steel plate 9. The slits 13 extending from the end surface of the back yoke portion 11 on one side in the width direction to the other side in the width direction are formed by punching the region R2 of the steel plate 9. The end surface of the back yoke portion 11 on the other side in the width direction and a pair of recesses 15A, 15B are formed by punching the region R3 of the steel plate 9.

[0058] like Figure 6 As shown, the core sheet forming component 10 obtained by punching out the steel plate 9 includes a back yoke portion 11 , a plurality of teeth portions 12 , a plurality of slit portions 13 , and a pair of recessed portions 15 .

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

[0060] The plurality of slit portions 13 extend from an end surface on one side in the width direction toward the other side in the width direction at the back yoke portion 11 between a pair of teeth 12A and 12B adjacent in the one direction among the plurality of teeth 12 .

[0061] The pair of recessed portions 15 are located at the end portion on the other side in the width direction of the back yoke portion 11. The pair of recessed portions 15 include a recessed portion 15A and a recessed portion 15B.

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

[0063] Next, in the cutting step S13, Figure 7 As shown, in the state where the core sheet forming component 10 is stacked in the above-mentioned axial direction, the core sheet 20 is formed by cutting between the recess 15A on one side of the pair of recesses 15 and the recess 15B on the other side at the cutting line CT. In addition, in the core sheet forming component 10, the slit portion 13 is located between the recess 15A on one side of the pair of recesses 15 and the recess 15B on the other side, so that the core sheet 20 can be easily cut out from the core sheet forming component 10.

[0064] Next, in the connecting step S14, the back yoke part 11 is connected to the concave portion 15A near the cut end of the core sheet 20 by welding the back yoke part 11 in the stacking direction on the outer peripheral surface 512 of the back yoke stacking part 51 formed by stacking the back yoke parts 11 in the axial direction. Figures 1 to 4 The first connecting portion 551 of the laminated core 1 is shown.

[0065] According to the above-mentioned method S1 for manufacturing the laminated iron core 1, Figures 1 to 4 The laminated core 1 shown. In the manufacturing method S1 of the laminated core 1, the first connecting portion 551 for connecting the back yoke portion 21 in the stacking direction is formed on the outer peripheral surface 512 of the back yoke stacking portion 51 in the recessed portion 15A near the cut end of the core sheet 20. Thus, the end of the core sheet 20 can be prevented from warping.

[0066] In addition, in the above-mentioned structure, the core sheet 20 is formed by cutting between the recess 15A of one side and the recess 15B of the other side in the state where the core sheet forming member 10 is stacked in a spiral shape in the axial direction. That is, the core sheet forming member 10 stacked in a spiral shape in the axial direction is cut into the core sheet 20 and the remaining portion R50 after the core sheet 20 is cut out.

[0067] In the core piece 20, the recessed portion 15A near the cut end can be used as a forming portion of a connecting portion for connecting by joining the back yoke portion 21 in the stacking direction by welding, etc. By welding at the forming portion, it is possible to suppress the connecting portion from protruding radially outward from the outer peripheral surface 512 of the back yoke stacking portion 51 during welding, or to suppress the protruding size.

[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 forming portion of the connecting portion in the remaining portion R50. That is, when the remaining portion R50 is spirally stacked along the axial direction as described above to manufacture other core sheets 20, the recess 15B can be used as a forming portion of the first connecting portion 551.

[0069] Therefore, it is possible to suppress generation of scrap between the core piece 20 and the remaining portion R50.

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

[0071] In addition, from another point of view, as described below, 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 back yoke laminated portion 51 including the one side end portion 251 in the extending direction of the core sheet 20. Therefore, the one side end portion 251 in the extending direction of the core sheet 20 can be prevented from warping.

[0072] In the above-described structure, the first groove 552 is located on the outer peripheral surface 512 of the back yoke laminated portion 51, relative to the first connecting portion 551, across the one side end edge 252 in the extending direction of the core sheet 20, in a direction opposite to the first direction from the one side end edge 252 toward the other side end edge 262 in the core sheet 20. The first groove 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.

[0073] In the punching step S11 of the method S1 for manufacturing the laminated core 1 , a pair of recessed portions 15 are formed in the core sheet forming member 10 at the other end portion of the back yoke portion 21 in the width direction. The recessed portions 15 are arranged at a predetermined interval.

[0074] Then, in the stacking step S12, the core sheet forming member 10 is spirally wound and stacked, and in the cutting step S13, the core sheet forming member 10 is cut at a predetermined length to obtain the core sheet 20 constituting the stacked body 50. In the cutting step S13, when the core sheet forming member 10 is cut between the two pairs of recesses 15 arranged, the recess 15A on the core sheet 20 side can be used to form the first connecting portion 551. On the other hand, the recess 15B of the portion R50 remaining after the core sheet is cut in the core sheet forming member 10 can also be used as a forming portion of a connection portion of a stacked body composed of other core sheets.

[0075] Therefore, when the core sheets 20 constituting the stacked body 50 are cut from the core sheet forming member 10 at the one end edge 252 as a boundary, other core sheets constituting another stacked body can be cut out from the remaining core sheet forming member without generating scraps.

[0076] Therefore, according to the above configuration, it is possible to obtain the laminated core 1 which can reduce the amount of waste when the core sheets 20 constituting the laminated body 50 are cut out from the core sheet forming member 10 in the manufacturing process of the laminated core 1 .

[0077] (Implementation Method 2)

[0078] (Structure of laminated core)

[0079] Reference Figure 8 , a laminated core 2 according to an exemplary embodiment 2 of the present invention will be described. Figure 81 is a perspective view showing a schematic structure of a 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 includes a second connecting portion and a second groove portion. Hereinafter, the same reference numerals are given to the same structures as those in Embodiment 1, and the description thereof is omitted, and only the parts different from the structure in Embodiment 1 are described.

[0080] like Figure 8 As shown, the second connection 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 stacking portion 51 including the other side end portion 261 in the extending direction of the core sheet 20. The second connection portion 651 can be realized, for example, by welding the back yoke portions 21 stacked in the stacking direction in the stacking direction.

[0081] When observing the stacked iron core 2 along the axial direction, the second groove portion 652 is located relative to the second connecting portion 651, separated by the other side end edge 262 in the extension direction of the iron core sheet 20, in a direction opposite to the second direction from the other side end edge 262 toward the one side end edge 252 in the iron core sheet 20, and extends along the stacking direction of the back yoke stacking portion 51 on the outer peripheral surface 512 of the back yoke stacking portion 51.

[0082] Therefore, when the core sheets 20 constituting the stacked body 50 are cut from the core sheet forming member 10 at the other end edge 262 , another core sheet constituting another stacked body can be cut out from the remaining core sheet forming member without generating scraps.

[0083] Therefore, according to the above configuration, it is possible to obtain the laminated core 1 which can reduce the amount of waste when the core sheets 20 constituting the laminated body 50 are cut out from the core sheet forming member 10 in the manufacturing process of the laminated core 1 .

[0084] (Implementation 3)

[0085] (Structure of laminated core)

[0086] Reference Fig. 9 and Fig.10 , a laminated core 3 according to an exemplary embodiment 3 of the present invention will be described. Fig. 9 It is a perspective view showing a schematic structure of a laminated core 3 according to the third embodiment. Fig.10 Yes means Fig. 9 FIG. 1 is a plan view showing a schematic structure of the laminated core 3. FIG.

[0087] The laminated core 3 of the third embodiment is different from the laminated core 2 of 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. Hereinafter, the same reference numerals are given to the same structures as those of the second embodiment and the description thereof is omitted, and only the parts different from the structures of the second embodiment are described.

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

[0089] The core sheet 20 is formed by spirally winding the core sheet forming member 10 a plurality of times with 48 segments as one turn. That is, when the laminated core 3 is viewed along the axial direction, one turn of the core sheet 20 constituting the laminated body 50 of the laminated core 3 includes 48 segments.

[0090] like Fig. 9 and Fig.10 As shown, the laminated core 3 includes: six connecting portions 30 including the first connecting portion 551 and the second connecting portion 651 ; six groove portions 40 including the first groove portion 552 and the second groove portion 652 ; and the positioning groove portion 71 .

[0091] The positioning groove 71 extends in the lamination direction of the back yoke lamination portion 51 on the outer peripheral surface 512 of the back yoke lamination portion 51. The depth of the positioning groove 71 is greater than the depth of the first groove 552 and the second groove 652.

[0092] According to the above configuration, for example, by engaging a jig or the like in the positioning groove 71 , the laminated core 3 can be easily positioned.

[0093] When the laminated core 3 is viewed in the axial direction, the groove portion 40 is located on the outer peripheral surface of the laminated core 3 so as to be aligned with the connection portion 30 in the circumferential direction via the slit laminated portion 53 .

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

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

[0096] When the back yoke laminated portion 51 is observed along the axial direction, the plurality of groove portions 40 are arranged in the circumferential direction relative to the plurality of connecting portions 30 on the outer peripheral surface 512 of the back yoke laminated portion 51 and extend along the lamination direction of the back yoke laminated portion 51. The plurality of 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 in addition to the first groove portion 552 and the second groove portion 652.

[0097] In this way, the plurality of grooves 40 are arranged respectively with respect to the plurality of connecting portions 30, so that 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 arranged in parallel in the core sheet forming member 10. Therefore, in the manufacturing process of the laminated core 3, the core sheet 20 can be cut by cutting between the recesses for forming the connecting portions 30 and the recesses for forming the grooves 40 in the core sheet forming member 10. Therefore, the degree of freedom of the position of cutting out the core sheet 20 is improved.

[0098] The advantages of such a laminated core 3 will be described in more detail with reference to a conventional method of manufacturing a laminated core 903 and a method of manufacturing a laminated core 3 in sequence.

[0099] (Conventional method for manufacturing laminated core)

[0100] Reference Figures 11 to 13 , a conventional method for manufacturing the laminated iron core 903 is described. Fig.11 1 is a plan view showing a core sheet forming member 910 used for manufacturing a conventional laminated core 903 . Fig.12 This is a lamination pattern table of the conventional laminated core 903 . Fig.13 1 is a top view showing an iron core sheet forming member 910 for manufacturing a laminated core 903. The conventional laminated core 903 is different from the laminated core 3 of the embodiment in that the laminated core 3 of the embodiment 3 has a plurality of grooves 40, whereas the conventional laminated core 903 does not have such grooves.

[0101] The laminated body 950 included in the conventional laminated core 903 is composed of core sheets 920 stacked in a spiral shape. The core sheets 920 are cut out from a core sheet forming member 910 . Fig.12 The stacking pattern table shown in FIG. 1 shows the number of windings of the spiral core sheet 920 and the number of the segments in the windings. Fig.13 As shown, the core sheet forming member 910 includes a back yoke portion 911 , a plurality of teeth portions 912 , a plurality of slit portions 913 , and a recessed portion 915 .

[0102] The iron chip 920 is through Fig.13 The core sheet forming component 910 shown is formed by spirally winding multiple times from the first segment of the first circle to the 42nd segment of the nth circle, with 48 segments as one circle. The same number is given to the segments in the lamination direction in the core sheet 905. Figures 11 to 13 In FIG. 1 , the same reference numerals are given to the sections of the laminated core 903 and the sections of the core sheet forming member 910 corresponding to the sections of the core sheet 920 .

[0103] The laminated core 903 has a plurality of connecting portions 930. Fig.11 In FIG. 1 , the numbers of the sections where the plurality of connecting portions 930 are located are shown by double frames. Fig.12 In the stacking pattern table, the dotted frame indicates a section where a plurality of connecting portions 930 are located. The connecting portion 930 is provided at one end 951 in the extending direction of the core sheet 920. In addition, the connecting portion 930 is provided at the other end 961 in the extending direction of the core sheet 920.

[0104] like Fig.11 As shown, the plurality of connecting parts 930 are located in sections 1, 9, 17, 25, 33 and 41. Fig.13 The iron core sheet forming part 910 shown corresponds to the recess 915. Fig.13 , sections of the recess 915 corresponding to the plurality of connecting portions 930 are shown by hatching.

[0105] The pattern of the above-mentioned segments is the same in the first cycle, the second cycle, ..., and the nth cycle of the first station. In addition, the second station and thereafter also have the same segment pattern as the first station. In addition, in order to prevent the one side end 951 and the other side end 961 of the core sheet 920 from warping, in the laminated core 903, the connecting portion 930 is located in the segment No. 1 where the one side end 951 of the core sheet 920 is located and the segment No. 41 where the other side end 961 is located.

[0106] Therefore, when following Fig.12 When manufacturing the first and second laminated cores 903 according to the pattern table, Fig.12 and Fig.13As shown by the hatching in , in each of the laminated cores 903, the 42nd to 48th sections of the final n-th turn become scraps W. The generation of this scrap W is the same for the third and subsequent stacks.

[0107] (Method for manufacturing laminated core)

[0108] Refer again Fig. 9 as well as Fig.10 , and refer to Fig.14 as well as Fig.15 , a method for manufacturing the laminated core 3 according to the third embodiment will be described. Fig.14 This is a lamination pattern table of the laminated iron core 3 according to the third embodiment. Fig.15 It is a plan view showing a core sheet forming member 10 for manufacturing the laminated core 3 according to the third embodiment.

[0109] exist Fig.10 In FIG. 1 , the numbers of the sections where the plurality of connection portions 30 are located are shown by double frames. In addition, the numbers of the sections where the plurality of groove portions 40 are located are shown by single frames. Fig.14 In the stacking pattern table shown in FIG. 1 , the dotted line frame indicates the section where the connecting portion 30 is located corresponding to the recess 15, and the circle mark indicates the section where the connecting portion 30 is located corresponding to the recess 15. Fig.15 The core sheet shown forms a section of the component 10 where the groove 40 corresponding to the recess 15 is located.

[0110] Fig.14 The pattern recorded in the figure shows the spiral winding of the core piece 20 and the number of the segments in the spiral winding. Fig.14 In the pattern table, the ○ mark indicates the section where the groove corresponding to the recess 15 is located, and the dotted frame indicates the section where the connecting portion corresponding to the recess 15 is located. In addition, a double frame means that there is a connecting portion in the section, and a single frame means that there is a groove in the section. Fig.14 In the stacking pattern table, the dotted line frame shows the section where the multiple connecting parts 30 are located. Fig.15 The iron core sheet forming part 10 shown corresponds to the recess 15. Fig.15 In FIG. 1 , sections of the recessed portion 15 corresponding to the plurality of connecting portions 30 are shown by hatching.

[0111] exist Fig.10 In the embodiment, the first connection portion 551 located at one side end portion 251 in the extension direction of the core sheet 20 is located in section 2. That is, the first turn of the core sheet 20 starts from section 2. In addition, the first groove portion 552 is located in section 1. That is, the first groove portion 552 is located at the head of the second turn of the core sheet 20.

[0112] Next, in the first cycle of the core piece 20, the position of the connection part 30 after the first connection part 551 is the 9th segment. After that, the connection parts 30 are respectively provided in the 17th, 26th, 33rd and 41st segments. Then the second cycle starts from the 1st segment. Therefore, in Fig.15 In the core sheet forming component 10 shown, the recesses 15 are formed in the sections No. 2, No. 9, No. 17, No. 26, No. 33, and No. 41 corresponding to the plurality of connecting portions 30 in the core sheet 20. In addition, in the core sheet forming component 10, the recesses 15 are also formed in the adjacent sections where the connecting portions 30 are located in the core sheet 20. That is, the recesses 15 are formed in the sections No. 1, No. 10, No. 18, No. 25, No. 34, and No. 42 corresponding to the plurality of groove portions 40 in the core sheet 20.

[0113] From the second week to the nth week, except starting from the first section, it is the same as the first week. In addition, as described above, a recess 15 is formed in the first section. In addition, the n+1th circle as the final circle ends at the section 9 where the other side end 261 in the extension direction of the core piece 20 is located. The second connecting portion 651 is located in the 9th section. Therefore, by cutting the core piece forming component 10 between the 9th section of the n+1th circle of the nth station 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 circle of the core piece 20 of the n+1th station.

[0114] According to the above structure, the last No. 9 segment of the final circle of the nth iron core piece 20 and the No. 2 segment of the first circle of the n+1th iron core piece 20 each have a recess 15. Therefore, the recess 15 can be used as a portion for forming a connecting portion. Therefore, the connecting portion 30 can be formed at both ends in the extension direction of the iron core piece 20, and the generation of edge material can be suppressed between the last segment of the nth iron core piece 20 and the first segment of the n+1th iron core piece 20. In addition, according to the above structure, the laminated iron core 3 can be continuously produced while suppressing the generation of edge material. In addition, referring to Figures 11 to 13 The method of manufacturing the conventional laminated core 903 described above is merely an example to explain the advantages of the laminated core 3. That is, the laminated core 3 can not only solve the above-mentioned problems of the conventional laminated core 903, but also can widely solve the problem of suppressing the generation of scrap.

[0115] In addition, from another perspective, in the laminated core 3, when the laminated core 3 is viewed along the axial direction, the first intermediate connection portion 31 is located at a position symmetrical to the first connection portion 551 with the axis Q as the center point. That is, the first intermediate connection portion 31 is located in the 26th section in the above-mentioned embodiment.

[0116] When the laminated core 3 is viewed along the axial direction, the second intermediate connection portion 32 is located at a position symmetrical to the second connection portion 651 about the axis Q. That is, the first intermediate connection portion 31 is located at the 33rd section in the above-described embodiment.

[0117] In the example of the above embodiment, the third intermediate connection portion 33 is located in the section No. 17. In the example of the above embodiment, the fourth intermediate connection portion 34 is located in the section No. 41.

[0118] In addition, in the example of the above embodiment, the first groove portion 552 is located in the section No. 1. In the example of the above embodiment, the second groove portion 652 is located in the section No. 10.

[0119] In the above embodiment, the first intermediate groove portion 41 is located in the 25th segment. In the above embodiment, the second intermediate groove portion 42 is located in the 34th segment. In the above embodiment, the third intermediate groove portion 43 is located in the 18th segment. In the above embodiment, the fourth intermediate groove portion 44 is located in the 44th segment.

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

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

[0122] In the above structure, in the circumferential direction of the stack 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, and the first intermediate connecting portion 31 and the second intermediate connecting portion 32 are located at positions symmetrical with respect to the first connecting portion 551 and the second connecting portion 651 with the axis Q as the center point.

[0123] Therefore, since the back yoke portion 21 is connected in a well-balanced manner in the laminating direction at the connection portions located at point-symmetrical positions, the laminated core 3 is unlikely to be deformed.

[0124] In addition, from another perspective, in the laminated core 3, the number of the plurality of connection parts 30 is six, which is an even number. In addition, when the laminated core is observed along the axial direction, the plurality of connection parts 30 have a first intermediate connection part 31 as a third connection part located at a position symmetrical with respect to the first connection part 551 with respect to the axis Q as the center point. In addition, when the laminated core is observed along the axial direction, the plurality of connection parts 30 have a second intermediate connection part 32 as a third connection part located at a position symmetrical with respect to the second connection part 651 with respect to the axis Q as the center point.

[0125] In the above-described structure, in the cylindrical laminated core 3, the first connection portion 551 or the second connection portion 651 and the third connection portion are located at positions symmetrical about the axis Q, so that the laminated core 3 is less likely to be deformed.

[0126] (Other embodiments)

[0127] The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and the above embodiments can be appropriately modified and implemented within the scope of the present invention.

[0128] In each of the above-mentioned embodiments, the laminated cores 2 and 3 have a plurality of connecting portions and a plurality of slot portions. However, the number of connecting portions and the number of slot portions may be one each. For example, in Embodiment 2, any one of the first connecting portion and the first slot portion, or the second connecting portion and the second slot portion may be omitted.

[0129] In the above-mentioned embodiments, when the laminated core 1 is viewed along the axial direction, the first groove 552 is arranged circumferentially with the first connecting portion 551 via the slit laminate 53 on the outer peripheral surface 512 of the back yoke laminate 51. However, the first groove may not be arranged circumferentially with the first connecting portion via the slit laminate 53.

[0130] In each of the above-mentioned embodiments, the core sheet forming component 10 has a recess 15 in each of two sections arranged in one direction at a predetermined interval. However, in the core sheet forming component, a recess may be formed in each of three or more sections arranged in one direction at a predetermined interval. In addition, a recess may be formed in each section. Thus, the degree of freedom of the section that can form the connection portion is increased.

[0131] In each of the above-mentioned embodiments, the slit stacking portion 53 stacks a plurality of slit portions 23 in the thickness direction. Here, the shape of each of the plurality of slit portions is not particularly limited. The slit portion may be, for example, a linear shape, a curved shape, or any one of a bent shape. In addition, in the slit stacking portion, the shapes of two adjacent slit portions in the stacking direction may not be consistent.

[0132] In the third embodiment described above, the connecting portion 30, the groove portion 40 and the recessed portion 15 are located Fig. 9 , Fig.10 , Fig.14 as well as Fig.15 However, in the laminated core, the positions of the connecting portion, the groove portion, and the recessed portion are not limited to Fig. 9 , Fig.10 , Fig.14 as well as Fig.15 The specific segment shown.

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

[0134] For example, in the third embodiment described above, the first intermediate connection portion 31 is located in the 26th section, while the first intermediate groove portion 41 located in the section next to the first intermediate connection portion 31 is located in the 25th section. However, the position of the first intermediate connection portion and the position of the first intermediate groove portion may be interchanged. In addition, the position from the second intermediate connection portion to the fourth intermediate connection portion and the position from the second intermediate groove portion to the fourth intermediate groove portion may be interchanged, respectively.

[0135] In the above-mentioned third embodiment, the laminated iron core 3 has the positioning groove portion 71. However, the laminated iron core may not have the positioning groove portion.

[0136] Furthermore, motors having the laminated cores 1, 2, and 3 of the above-described embodiments also belong to the scope of the present invention. Fig.16 , a motor 91 having a laminated core 3 is described as an example. Fig.16 It is a cross-sectional view showing a schematic structure of a motor 91 according to an exemplary embodiment of the present invention.

[0137] like Fig.16As shown, 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 in a state of penetrating the through hole 92a in the axial direction. The rotor 92 is located radially inward of the laminated core 3 so as to be rotatable together with the shaft 95 about the axis Q. 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 parallel to the through hole 92a. The magnet 96 is located in the magnet insertion hole 92b.

[0138] The laminated core 3 is accommodated in a case 94. The stator coil 93 is wound around the laminated core 3.

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

[0140] (Structure example)

[0141] In addition, the present technology may also adopt the following structures.

[0142] (1) A laminated iron core, comprising a cylindrical laminate extending along an axis line in which iron core sheets are laminated in a state where a back yoke portion, a tooth portion and a slit portion are overlapped in a thickness direction, wherein the iron core sheet comprises: a plate-shaped back yoke portion extending in a spiral shape with the axis line as the center; a plurality of tooth portions protruding radially inwardly of the spiral from the back yoke portion; and a plurality of slit portions extending radially outwardly from the inner peripheral end surface of the back yoke portion toward the radially outward direction of the spiral between a pair of tooth portions adjacent to each other in the extension direction among the plurality of tooth portions. The above-mentioned stacked body comprises: a cylindrical back yoke stacked portion, which is formed by stacking the above-mentioned back yoke portion along the above-mentioned thickness direction; a plurality of tooth stacked portions, which is formed by stacking a plurality of the above-mentioned tooth portions along the above-mentioned thickness direction, arranged in the circumferential direction, and protruding radially inward from the inner circumferential surface of the above-mentioned back yoke stacked portion; and a plurality of slit stacked portions, which is formed by stacking a plurality of the above-mentioned slit portions along the above-mentioned thickness direction, arranged in the above-mentioned circumferential direction, and extending radially outward from the inner circumferential end surface of the above-mentioned back yoke stacked portion between an adjacent pair of the above-mentioned tooth stacked portions. The above-mentioned laminated iron core comprises: a first connecting portion, which connects the above-mentioned back magnetic yoke portion in the stacking direction on the outer peripheral surface of a portion of the back magnetic yoke laminated portion including one side end portion in the extension direction of the above-mentioned iron core sheet; and a first groove portion, which, when observing the above-mentioned laminated iron core along the axial direction, is located in a direction opposite to the first direction from the one side end edge toward the other side end edge in the above-mentioned iron core sheet, separated by one side end edge in the extension direction of the above-mentioned iron core sheet, relative to the above-mentioned first connecting portion, and extends along the stacking direction of the above-mentioned back magnetic yoke laminated portion on the outer peripheral surface of the above-mentioned back magnetic yoke laminated portion.

[0143] (2) The laminated iron core described in (1) above also comprises: a second connecting portion, which connects the back magnetic yoke portion in the stacking direction on the outer peripheral surface of a portion of the back magnetic yoke laminated portion including the other side end portion in the extension direction of the iron core sheet; and a second groove portion, which, when the laminated iron core is observed along the axial direction, is located in a direction opposite to the second direction from the other side end edge toward the one side end edge in the iron core sheet across the other side end edge in the extension direction of the iron core sheet relative to the second connecting portion, and extends along the stacking direction of the back magnetic yoke laminated portion on the outer peripheral surface of the back magnetic yoke laminated portion. When the laminated iron core is observed along the axial direction, the first groove portion, the first connecting portion, the second connecting portion and the second groove portion are arranged in sequence along the first direction on the outer peripheral surface of the back magnetic yoke laminated portion.

[0144] (3) In the laminated iron core described in (2) above, there are: a plurality of connecting portions, which are arranged in a circumferential direction on the outer peripheral surface of the back yoke laminate portion when the back yoke laminate portion is observed along the axial direction, and connect the back yoke laminate portion in the stacking direction; and a plurality of groove portions, which are arranged in a circumferential direction on the outer peripheral surface of the back yoke laminate portion relative to the plurality of connecting portions when the back yoke laminate portion is observed along the axial direction, and extend along the stacking direction of the back yoke laminate 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.

[0145] (4) In the laminated iron core described in (3) above, there is: a first intermediate connecting portion, which is located at a position symmetrical with respect to the first connecting portion with the above-mentioned axis as the center point when the above-mentioned laminated iron core is observed along the above-mentioned axial direction; and a second intermediate connecting portion, which is located at a position symmetrical with respect to the second connecting portion with the above-mentioned axis as the center point when the above-mentioned laminated iron core is observed along the above-mentioned axial direction, and in the circumferential direction of the above-mentioned laminated iron core, the number of teeth located between the above-mentioned first connecting portion and the above-mentioned second connecting portion is the same as the number of teeth located between the above-mentioned first intermediate connecting portion and the above-mentioned second intermediate connecting portion.

[0146] (5) In the laminated iron core described in (3) or (4) above, the number of the plurality of connecting parts is an even number, and the laminated iron core further comprises a third connecting part. When the laminated iron core is observed along the axial direction, the third connecting part is located at a position symmetrical with respect to the first connecting part or the second connecting part with the axial line as the center point.

[0147] (6) In the laminated iron core described in any one of the above (3) to (5), there is a positioning groove portion, which extends on the outer peripheral surface of the above-mentioned back yoke laminated portion along the stacking direction of the above-mentioned back yoke laminated portion, and the depth of the above-mentioned positioning groove portion is greater than the depth of the above-mentioned first groove portion and the above-mentioned second groove portion.

[0148] (7) In the laminated core described in any one of (3) to (6) above, when viewing the laminated core in the axial direction, the groove portion is located on the outer peripheral surface of the laminated core so as to be aligned in the circumferential direction with the slit laminate portion and the connecting portion interposed therebetween.

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

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

[0151] (9) A method for manufacturing a laminated iron core, wherein an iron core sheet forming component extending in a band shape in one direction is deformed toward one side in a width direction while being spirally wound to manufacture a cylindrical laminated iron core extending along an axis. The method for manufacturing the laminated iron core comprises: a punching step of forming the iron core sheet forming component by punching a plate-shaped steel plate, wherein the iron core sheet forming component has a plate-shaped back yoke portion extending in the one direction, a plurality of teeth 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 teeth adjacent in the one direction among the plurality of teeth, and a pair of recesses at an end portion of the back yoke portion located on the other side in the width direction; and a stacking step of forming the iron core sheet forming component. The component is deformed to one side in the width direction and wound in a spiral shape, and the back yoke portion, the tooth portion, the slit portion and the recessed portion are overlapped and stacked in the axial direction respectively; a cutting step, in a state where the iron core sheet forming component is stacked along the axial direction, the recess of one of the pair of recesses is cut off from the recess of the other side, thereby forming an iron core sheet; and a connecting step, at the recess near the cut end of the iron core sheet, the back yoke portion is connected by joining the back yoke portion in the stacking direction on the outer peripheral surface of the back yoke stacked portion formed by stacking the back yoke portion along the axial direction.

[0152] Availability in production

[0153] The present invention can be used for a laminated core formed by spirally winding a strip-shaped core sheet forming member, a motor, and a method for manufacturing the laminated core.

Claims

1. A laminated iron core having a cylindrical laminate extending along an axis line, wherein a back yoke portion, a tooth portion, and a slit portion are laminated in a state where the core pieces are overlapped in the thickness direction, respectively, The core sheet has: The plate-shaped back yoke portion extends in a spiral shape with the axis as the center; A plurality of teeth protruding from the back yoke portion radially inward of the spiral; as well as The plurality of slit portions extend radially outward from the inner peripheral end surface of the back yoke portion between a pair of teeth portions adjacent in the extending direction among the plurality of teeth portions, The laminated core is characterized in that The laminated body has: A cylindrical back yoke laminated portion, which is formed by laminating the back yoke portions along the thickness direction; A plurality of tooth laminations, wherein the plurality of teeth are laminated in the thickness direction, arranged in the circumferential direction, and protrude radially inward from the inner circumferential surface of the back yoke lamination; as well as a plurality of slit lamination portions, wherein the slit portions are stacked in the thickness direction, arranged in the circumferential direction, and extending radially outward from the inner peripheral end surface of the back yoke lamination portion between an adjacent pair of the tooth lamination portions, The laminated core has: a first connecting portion that connects the back yoke portions in a stacking direction on an outer peripheral surface of a portion of the back yoke stacking portion including one end portion in the extending direction of the core sheet; and The first groove portion, when observing the stacked iron core along the axial direction, is located relative to the first connecting portion, across one end edge in the extension direction of the iron core sheet, in a direction opposite to the first direction from the one end edge toward the other end edge in the iron core sheet, and extends along the stacking direction of the back yoke stacking portion on the outer peripheral surface of the back yoke stacking portion.

2. The laminated core according to claim 1, characterized in that Also features: 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 stacking portion that includes the other end portion in the extending direction of the core sheet; as well as The second groove portion is located in a direction opposite to the second direction from the other side end edge toward the one side end edge in the core sheet, i.e., the second direction, when the laminated core is observed along the axial direction, relative to the second connecting portion, across the other side end edge in the extending direction of the core sheet, and extends on the outer peripheral surface of the back yoke laminated portion along the lamination direction of the back yoke laminated portion. When the laminated core is viewed along the axial direction, the first groove portion, the first connecting portion, the second connecting portion, and the second groove portion are arranged in order along the first direction on the outer peripheral surface of the back yoke laminated portion.

3. The laminated core according to claim 2, characterized in that: have: a plurality of connecting portions which are arranged in a circumferential direction on the outer peripheral surface of the back yoke stacking portion when the back yoke stacking portion is viewed in the axial direction, and connect the back yoke stacking portion in a stacking direction; and a plurality of grooves, which are arranged on the outer peripheral surface of the back yoke laminated portion in the circumferential direction relative to the plurality of connecting portions when the back yoke laminated portion is viewed in the axial direction, and extend in the lamination direction of the back yoke laminated portion, The plurality of connecting parts include the first connecting part and the second connecting part, The plurality of groove portions include the first groove portion and the second groove portion.

4. The laminated core according to claim 3, characterized in that have: a first intermediate connection portion, which is located at a position symmetrical with respect to the first connection portion with the axis as a center point when the laminated core is viewed along the axis direction; and The second intermediate connecting portion is located at a position symmetrical with respect to the second connecting portion with the axis as a center point when the laminated core is viewed along the axis direction. 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.

5. The laminated core according to claim 3, characterized in that: The number of the plurality of connecting parts is an even number, A third connection portion is further provided. When the laminated core is viewed along the axial direction, the third connection portion is located at a position symmetrical with respect to the first connection portion or the second connection portion with the axial line as a center point.

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

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 located on the outer peripheral surface of the laminated core so as to be aligned in the circumferential direction with the slit laminated portion and the connecting portion interposed therebetween.

8. A motor, characterized in that: have: stator; and Rotor, At least one of the stator and the rotor includes the laminated core according to any one of claims 1 to 6.

9. A method for manufacturing a laminated iron core, comprising: making an iron core sheet forming member extending in a strip shape in one direction be deformed toward one side in a width direction while being spirally wound to manufacture a cylindrical laminated iron core extending along an axis line; The method for manufacturing the laminated core is characterized by comprising: The punching step is to form the core sheet forming member by punching a plate-shaped steel plate, wherein: The core sheet forming member comprises a plate-shaped back yoke portion extending in the one direction, a plurality of teeth 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 teeth adjacent to each other in the one direction among the plurality of teeth, and a pair of recessed portions at an end portion of the back yoke portion located on the other side in the width direction; a lamination step of deforming the core sheet 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 by overlapping each other in the axial direction; a cutting step of cutting between one of the pair of recesses and the other recess, while the core sheet forming members are stacked in the axial direction, thereby forming a core sheet; and The connecting step connects the back yoke parts in a stacking direction by joining the back yoke parts on the outer peripheral surface of the back yoke stacked part formed by stacking the back yoke parts in the axial direction at the recessed part near the cut end of the core sheet.

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