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

Abstract

To provide a laminated iron core in which spiral iron core pieces can be more easily bonded in a lamination direction.SOLUTION: A laminated iron core 1 has a cylindrical shape in which iron core pieces 10 each having a plate-shaped back yoke part 11, a plurality of teeth parts, and a plurality of slits extending spirally around an axis line are laminated. The laminated iron core includes an adhesive agent fixing part 30 that bonds regions of the iron core pieces overlapping each other in a laminating direction to each other in the laminating direction. The adhesive fixing part includes: an in-slit groove adhesive part 31 extending from one end to the other end in the laminating direction of a slit groove along an inner wall surface of the slit groove 23 in which the plurality of slits overlap in the laminating direction; and a region adhesive part 32 connected to the in-slit groove adhesive part and located between the regions to bond at least parts of the regions to each other in the laminating direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Laminated cores are known that are manufactured by bending strip-shaped steel plates extending in one direction into an arc to form spirally extending core pieces, and then stacking the spirally extending core pieces. For example, Patent Document 1 discloses a stator core in which a blanked plate having a plurality of teeth protruding from one long side of a strip-shaped back yoke is bent into an arc, multiple arc-shaped blanked plates are combined to form a ring-shaped straight core, and the outer periphery of the straight core is fixed by laser welding.

[0003] Furthermore, a laminated core is known in which a plurality of disk-shaped core pieces adjacent in the lamination direction are bonded together with an adhesive. For example, Patent Document 2 discloses a laminated core including a plurality of electromagnetic steel sheets, adhesive portions that bond the electromagnetic steel sheets together, and weld portions that weld the electromagnetic steel sheets together, and in which the electromagnetic steel sheets are joined together only by the adhesive portions and the weld portions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-143164 [Patent Document 2] Japanese Patent Publication No. 2023-60136 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, when fixing spiral core pieces in the stacking direction as in Patent Document 1, it is possible to adhere the spiral core pieces in the stacking direction with an adhesive as in Patent Document 2. However, the core pieces are spirally continuous. Therefore, it may be difficult to apply the adhesive between overlapping regions of the spiral core pieces in the stacking direction.

[0006] For this reason, when manufacturing a laminated core in which spiral core pieces are stacked, it is required to more easily bond the spiral core pieces in the stacking direction using an adhesive.

[0007] An object of the present invention is to provide a laminated core in which the spiral core pieces can be more easily bonded in the lamination direction. [Means for solving the problem]

[0008] A laminated core according to one embodiment of the present invention is a cylindrical laminated core formed by stacking core pieces, each core piece having a plate-shaped back yoke portion extending spirally about an axis, a plurality of plate-shaped teeth extending radially inward from the back yoke portion and aligned circumferentially, and a plurality of slits extending radially outward from an inner peripheral end face of the back yoke portion at positions between base ends of adjacent teeth in the circumferential direction. This laminated core has an adhesive fixing portion that bonds overlapping regions of the core pieces in the stacking direction together in the stacking direction. The adhesive fixing portion has an inner slit groove adhesive portion that extends from one end of the slit groove to the other end in the stacking direction along an inner wall surface of the slit groove where the plurality of slits overlap in the stacking direction, and a region adhesive portion that is connected to the inner slit groove adhesive portion and is located between the regions to bond at least a portion of the regions in the stacking direction.

[0009] A manufacturing method for a laminated iron core according to one embodiment of the present invention is a manufacturing method for manufacturing a cylindrical laminated iron core in which iron core pieces are stacked, each iron core piece having a plate-shaped back yoke portion extending spirally around an axis, a plurality of plate-shaped tooth portions extending radially inward from the back yoke portion and aligned circumferentially, and a plurality of slits extending radially outward from the inner end face of the back yoke portion at positions between the base ends of circumferentially adjacent tooth portions in the back yoke portion. This manufacturing method includes a steel plate punching step of punching a steel plate to form a plate-shaped core piece forming portion having a band-shaped back yoke forming portion extending in one direction, a plurality of tooth forming portions that protrude in one direction in the width direction from an end portion on one side of the back yoke forming portion in the width direction and are aligned in the one direction, and a plurality of slit forming portions that extend from an end portion on one side of the back yoke forming portion in the width direction toward the other side of the width direction at positions between base ends of adjacent tooth forming portions in the back yoke forming portion in the one direction; a bending step of eliminating gaps in the plurality of slit forming portions in the core piece forming portion formed in the steel plate punching step and bending the core piece forming portion into an arc shape when viewed in the stacking direction to form the core pieces; and a bending step of forming the core pieces formed in the bending step. the iron core pieces stacked in the stacking direction; an adhesive member injection process in which an adhesive member is injected from one end in the stacking direction into slit grooves in which the plurality of slits in the iron core pieces stacked in the stacking process overlap in the stacking direction, allowing the adhesive member to penetrate between regions of the iron core pieces that overlap in the stacking direction; and an adhesive member hardening process in which the adhesive member injected in the adhesive member injection process is hardened to form an inner slit groove adhesive portion that extends along the inner wall surface of the slit groove from one end to the other end in the stacking direction of the slit groove, and an area adhesive portion that is integrally connected to the inner slit groove adhesive portion and is located between the regions to bond at least a portion of the regions in the stacking direction. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a laminated core that allows spiral core pieces to be more easily bonded. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a laminated core according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a laminated core viewed in the axial direction. [Figure 3] FIG. 3 is a partially enlarged view of FIG. 2, illustrating the position of the adhesive fixing portion. [Figure 4] FIG. 4 is a partially enlarged view of FIG. 2, illustrating the circumferential width of the slit groove. [Figure 5] FIG. 5 is an end view of the VV of FIG. [Figure 6] FIG. 6 is an end view taken along line VI-VI of FIG. [Figure 7] FIG. 7 is a flowchart showing a method for manufacturing the laminated core according to the first embodiment. [Figure 8] FIG. 8 is a diagram illustrating the steel plate punching process. [Figure 9] FIG. 9 is a diagram illustrating the bending step and the stacking step. [Figure 10] FIG. 10 is a partially enlarged view of FIG. 9, illustrating the circumferential width of the slit. [Figure 11] FIG. 11 is an end view taken along the line XI-XI in FIG. 10, and is a view illustrating how the adhesive material is injected from one side in the stacking direction in the adhesive material injection step. [Figure 12] FIG. 12 is a diagram illustrating how the adhesive material is injected from one side to the other in the stacking direction in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by 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 the components.

[0013] In the following description, the direction parallel to the axis P of the central axis of the laminated core will be referred to as the axial direction, the direction perpendicular to the axis P will be referred to as the radial direction, and the direction along the arc centered on the axis P will be referred to as the circumferential direction.

[0014] In the following description, expressions such as "fix," "connect," and "attach" include not only cases where members are directly fixed to each other, but also cases where members are fixed via other members. In other words, in the following description, expressions such as "fix" include both direct and indirect fixation of members to each other.

[0015] (Embodiment 1) BACKGROUND ART A motor is known that has a stator having a laminated core, and a rotor that is positioned radially inward D1 or radially outward D2 relative to the stator and rotates about an axis P of the laminated core.

[0016] (Laminated core made up of spiral core pieces) A laminated core 1 according to a first exemplary embodiment of the present invention will be described with reference to Figures 1 to 6. As shown in Figure 1, the laminated core 1 has a cylindrical shape extending along an axis P. As shown in Figures 1 and 2, the laminated core 1 is formed by stacking core pieces 10, which extend spirally around the axis P, in the thickness direction and bonding the stacked core pieces 10 together in the stacking direction.

[0017] 2, the core pieces 10 that make up the laminated core 1 are formed by winding a plate-shaped core piece forming portion formed by punching an electromagnetic steel sheet into an arc shape in the thickness direction. Hereinafter, the lamination direction is the same as the thickness direction of the core pieces 10 in the laminated core 1.

[0018] As shown in FIGS. 1 and 2, the core pieces 10 constituting the laminated core 1 have a back yoke portion 11, a plurality of teeth portions 12, and a plurality of slits 13.

[0019] The back yoke portion 11 is located radially outward of the core piece 10 and extends spirally around the axis P. The multiple teeth portions 12 extend radially inward from the back yoke portion 11 and are aligned in the circumferential direction C. The multiple teeth portions 12 are located radially inward of the core piece 10. The back yoke portion 11 and the multiple teeth portions 12 are parts of the core piece 10, which is a single member, and each is plate-shaped.

[0020] The multiple slits 13 are cuts that extend radially outward from an end face 111 on the inner circumferential side of the back yoke portion 11 at positions between the base ends of the teeth portions 12 that are adjacent in the circumferential direction C. In other words, the multiple slits 13 are located in the back yoke portion 11.

[0021] The laminated core 1, which is formed by laminating spiral core pieces 10, has a laminated core body portion 20, slit grooves 23, and adhesive fixing portions 30.

[0022] The laminated core body 20 is a laminate in which the back yoke 11 and the plurality of teeth 12 of the core pieces 10 are spirally wound and stacked in the thickness direction. The outer edges of the back yoke 11 and the plurality of teeth 12 that make up the laminated core body 20 overlap when viewed in the stacking direction.

[0023] The slit grooves 23 are formed in the laminated core 1 by overlapping multiple slits 13 in the core pieces 10 in the stacking direction. The multiple slits 13 that make up the slit grooves 23 are located at positions that overlap in the stacking direction. The slit grooves 23 extend from one end to the other end in the stacking direction of the laminated core 1, and multiple slit grooves 23 are lined up in the circumferential direction C. The slit grooves 23 are grooves that open to one side X1 and the other side X2 in the stacking direction and radially inward D1.

[0024] As shown in FIGS. 3 and 4, the slit groove 23 has a radially outer groove portion 231 and a radially inner groove portion 232.

[0025] The radially outer groove portion 231 is located at the radially outer end of the slit groove 23. The radially inner groove portion 232 is located radially inward of the radially outer groove portion 231 and has a slit shape when viewed in the stacking direction. The radially outer groove portion 231 and the radially inner groove portion 232 are radially connected at a predetermined angle at a connection point E23. The radially outer groove portion 231 and the radially inner groove portion 232 are each part of a single slit groove 23. The radially outer groove portion 231 is a part located radially outward D2 from the connection point E23, and the radially inner groove portion 232 is a part located radially inward D1 from the connection point E23.

[0026] 4, the width of the radially outer groove portion 231 is greater than the width of the radially inner groove portion 232. More specifically, an average width L231 obtained by averaging the widths of the radially outer groove portion 231 in the circumferential direction C in the radial direction is greater than an average width L232 obtained by averaging the widths of the radially inner groove portion 232 in the circumferential direction C in the radial direction.

[0027] (Adhesive fixing part) 5, the adhesive fixing portion 30 extends in the stacking direction along the inner wall surface of the slit groove 23. The adhesive fixing portion 30 bonds together in the stacking direction regions (lamination regions R1, R2) of the core pieces 10 that overlap in the stacking direction.

[0028] The adhesive fixing portion 30 is in a state where the adhesive member M injected into the radially outer groove portion 231 of the slit groove 23 has hardened. The adhesive member M is a fluid adhesive. Since a known adhesive can be used for the adhesive member M, detailed description will be omitted, but for example, an anaerobic adhesive or the like can be used.

[0029] The adhesive fixing portion 30 is formed when the adhesive material M injected into the slit groove 23 travels along the inner wall of the slit groove 23, penetrates between the laminated regions R1, R2 of the iron core piece 10, and hardens. Details of the laminated regions R1, R2 will be described later.

[0030] The adhesive fixing portion 30 has an inner slit groove adhesive portion 31 and a region adhesive portion 32 .

[0031] The adhesive portions 31 within the slit grooves extend along the inner wall surfaces of the slit grooves 23 from one end to the other end in the stacking direction of the slit grooves 23. The adhesive portions 31 within the slit grooves are formed when the adhesive material M injected into one end of the slit grooves 23 in the stacking direction reaches the other end and then hardens. The adhesive portions 31 within the slit grooves 23 fix the laminated core pieces 10 in the stacking direction. The adhesive portions 31 within the slit grooves 23 are respectively located within the multiple slit grooves 23 that are aligned in the circumferential direction C in the laminated core 1.

[0032] As shown in FIGS. 3 and 4, the slit groove adhesive portion 31 has a radially outer groove adhesive portion 311 and a radially inner groove adhesive portion 312.

[0033] The radially outer groove adhesive portion 311 extends along the inner wall surface of the radially outer groove portion 231, from one end to the other end in the stacking direction of the radially outer groove portion 231. The radially inner groove adhesive portion 312 extends along the inner wall surface of the radially inner groove portion 232, from one end to the other end in the stacking direction of the radially inner groove portion 232. The radially outer groove adhesive portion 311 and the radially inner groove adhesive portion 312 are each part of a single slit groove adhesive portion 31.

[0034] 3 and 5, the area adhesive portions 32 are formed by the adhesive material M injected into the slit grooves 23 entering between the laminated regions R1, R2 of the core piece 10 from the slit grooves 23 and hardening. Therefore, the area adhesive portions 32 are connected to the intra-slit groove adhesive portions 31, and are located between the laminated regions R1, R2, bonding the laminated regions R1, R2 to each other in the lamination direction. Furthermore, the intra-slit groove adhesive portions 31 connect the area adhesive portions 32 in the lamination direction.

[0035] 3 and 4, the regional adhesive portions 32 are connected to the intra-slit groove adhesive portions 31 located in each of the multiple slit grooves 23 in the laminated core 1, and extend from the intra-slit groove adhesive portions 31 in the circumferential direction C when viewed in the lamination direction. The regional adhesive portions 32 are formed by the adhesive material M extending from the intra-slit groove adhesive portions 31 aligned in the circumferential direction C being connected in the circumferential direction C and hardening. In other words, the regional adhesive portions 32 are continuous in a spiral shape in the laminated core 1.

[0036] The lamination regions R1 and R2 will now be described. As shown in FIG. 5, the core piece 10 in the laminated core 1 has a first lamination region R1 and a second lamination region R2. The first lamination region R1 is a region of the first surface F1, which is the surface of the core piece 10 on one side X1 of the lamination direction, where the first surface F1 faces the second surface F2, which is the surface of the core piece 10 on the other side X2 of the lamination direction. The second lamination region R2 is a region of the second surface F2 of the core piece 10 where the second surface F2 faces the first surface S1 in the lamination direction. Therefore, one end surface T1 of the first surface F1 that does not face the second surface F2 is not included in the first lamination region R1. Similarly, the other end surface T2 of the second surface F2 that does not face the first surface F1 is not included in the second lamination region R2.

[0037] In the laminated core 1 in which the core pieces 10 are stacked in a spiral shape, the first stacked region R1 and the second stacked region R2 overlap in the stacking direction. That is, in the laminated core 1, the stacked regions R1 and R2 overlap in the stacking direction.

[0038] The area bonding portion 32 is located between the laminated regions R1, R2 of the core piece 10 that overlap in the laminated direction, and bonds the laminated regions R1, R2 to each other in the laminated direction. That is, the area bonding portion 32 is located between the first laminated region R1 and the second laminated region R2 of the core piece 10, and bonds the first laminated region R1 to the second laminated region R2 in the laminated direction. The area bonding portion 32 is not located on one end face T1 of the first surface F1 or the other end face T2 of the second surface F2.

[0039] As shown in Figures 3 and 6, each of the lamination regions R1 and R2 includes a back yoke lamination region RB and a teeth lamination region RT. The back yoke lamination region RB is the region of the lamination regions R1 and R2 where the back yoke portions 11 of the laminated core 1 overlap in the lamination direction. The teeth lamination region RT is the region of the lamination regions R1 and R2 where the multiple teeth portions 12 of the laminated core 1 overlap in the lamination direction. The back yoke lamination region RB and the teeth lamination region RT are each portions of a single lamination region R1 and R2.

[0040] The region adhesive portion 32 includes a back yoke lamination region adhesive portion 321 and a teeth lamination region adhesive portion 322 .

[0041] As shown in Figures 3, 4 and 5, the back yoke stacking region adhesive portion 321 is connected to the radially outer groove adhesive portion 311 and is located between the back yoke stacking regions RB to adhesively bond the back yoke stacking regions RB in the stacking direction.

[0042] 3, 4, and 6, teeth stacking region adhesive portion 322 is connected to back yoke stacking region adhesive portion 321 and is located between teeth stacking regions RT to adhesively bond the teeth stacking regions RT in the stacking direction. Back yoke stacking region adhesive portion 321 and teeth stacking region adhesive portion 322 are parts of a single region adhesive portion 32.

[0043] (Laminated core manufacturing method) An exemplary method for manufacturing the laminated core 1 having the above-described configuration will be described in detail with reference to FIGS.

[0044] Fig. 7 is a flowchart showing an example of a method for manufacturing the laminated core 1. As shown in Fig. 7, the method for manufacturing the laminated core 1 includes a preparation step S1, a steel plate punching step S2, a bending step S3, a lamination step S4, an adhesive injection step S5, and an adhesive hardening step S6.

[0045] In the preparation step S1, a known magnetic steel sheet, which is a magnetic material, is prepared. Note that the magnetic steel sheet will be referred to as a steel sheet 70 hereinafter.

[0046] In the steel plate punching step S2, the steel plate 70 is punched to form a plate-shaped core piece forming portion 80. Fig. 8 is an example of a punching diagram of the core piece forming portion 80. In the steel plate punching step S2, the core piece forming portion 80 is obtained by removing the removed portion 75 (part of the steel plate 70) indicated by diagonal lines in Fig. 8 by punching. The steel plate punching step S2 is performed by, for example, pressing.

[0047] The core piece forming portion 80 formed in the steel plate punching step S2 has a back yoke forming portion 81, a plurality of teeth forming portions 82, and a plurality of slit forming portions 83.

[0048] Back yoke forming portion 81 is strip-shaped and extends in one direction. Multiple tooth forming portions 82 protrude in one width direction W1 from an end portion 811 on one width direction side of back yoke forming portion 81 and are lined up in one direction.

[0049] The multiple slit forming portions 83 are cuts that extend from an end portion 811 on one width direction side of the back yoke forming portion 81 toward the other width direction W2 at positions between the base ends of adjacent tooth forming portions 82 in one direction in the back yoke forming portion 81. The multiple slit forming portions 83 are located in the back yoke forming portion 81.

[0050] As shown in FIGS. 9 and 10, in the bending step S3, the core piece forming portion 80 is bent into an arc shape when viewed in the thickness direction, and the gaps between the multiple slit forming portions 83 are eliminated to form the core piece 10.

[0051] Specifically, in the bending process S3, a back yoke portion 11 is formed in which the back yoke forming portion 81 is bent into an arc shape when viewed in the thickness direction, and a plurality of tooth portions 12 are formed in which a plurality of tooth forming portions 82 arranged in one direction are arranged in the circumferential direction C when viewed in the thickness direction.

[0052] Furthermore, the plurality of slits 13 are formed by closing the gaps between the plurality of slit forming portions 83. The plurality of slits 13 each have a radially outer slit portion 131 and a radially inner slit portion 132.

[0053] The radially outer slit portion 131 is located at the radially outer end of the slit 13. The radially inner slit portion 132 is located radially inward of the radially outer slit portion 131 and has a slit shape when viewed in the thickness direction. The radially outer slit portion 131 and the radially inner slit portion 132 are radially connected at a predetermined angle at a connection point E13. The radially outer slit portion 131 and the radially inner slit portion 132 are each part of a single slit 13. The radially outer slit portion 131 is a part located radially outward D2 from the connection point E13, and the radially inner slit portion 132 is a part located radially inward D1 from the connection point E13.

[0054] In the bending process S3, by closing the gaps of the slit forming portions 83, the width L131 of the radially outer slit portions 131 located at the ends of the plurality of slits 13 on the radially outer side D2 is made larger than the width L132 of the radially inner slit portions 132 located radially inward D1 from the radially outer slit portions 131. More specifically, in the bending process S3, the average width L131 obtained by averaging the widths in the circumferential direction C of the radially outer slit portions 131 in the radial direction is made larger than the average width L132 obtained by averaging the widths in the circumferential direction C of the radially inner slit portions 132 in the radial direction.

[0055] In the lamination step S4, the core pieces 10 formed in the bending step S3 are stacked in the thickness direction while being wound in a spiral shape. Specifically, the back yoke portion 11 and the plurality of teeth portions 12 are stacked in the thickness direction with the outer edges of the back yoke portion 11 and the plurality of teeth portions 12 and the plurality of slits 13 overlapping when viewed in the lamination direction.

[0056] In the lamination process S4, a plurality of slits 13 aligned in the circumferential direction C are stacked in the lamination direction to form a plurality of slit grooves 23 aligned in the circumferential direction C. As a result, the radially outer slit portions 131 become radially outer groove portions 231 of the slit grooves 23. The radially inner slit portions 132 become radially inner groove portions 232 of the slit grooves 23.

[0057] 11, in the adhesive member injection step S5, with the other end in the stacking direction of the laminate of the core pieces 10 formed in the stacking step S4 facing downward, an adhesive member M is injected into the multiple slit grooves 23 from one side in the stacking direction X1. More specifically, in the adhesive member injection step S5, the adhesive member M is injected into the radially outer groove portions 231 of the multiple slit grooves 23.

[0058] The adhesive material M injected into one end of the radially outer groove portion 231 of the slit groove 23 in the stacking direction flows along the inner wall surface of the radially outer groove portion 231 in the other stacking direction X2 due to the influence of gravity. The adhesive material M injected into the radially outer groove portion 231 flows radially inward D1 within the radially outer groove portion 231 and spreads into the radially inner groove portion. The gap between the stacking regions R1 and R2 opens into the slit groove 23. Therefore, the adhesive material M flowing along the inner wall surface of the slit groove 23 in the other stacking direction X2 enters the gap between the stacking regions R1 and R2 from the inner wall surface of the slit groove 23 and penetrates between the stacking regions R1 and R2. In this way, the adhesive material M spreads from the inner wall surface of the slit groove 23 between the stacking regions R1 and R2. As a result, as shown in FIG. 12 , the adhesive material M can penetrate between the stacking regions R1 and R2 located from one side to the other in the stacking direction.

[0059] In adhesive material injection step S5, adhesive material M is injected into the plurality of slit grooves 23 aligned in the circumferential direction C. The adhesive material M injected into the plurality of slit grooves 23 penetrates between the back yoke stacking regions RB that overlap in the stacking direction of the back yoke section 11, and spreads in the circumferential direction C. The adhesive material M injected into each slit groove 23 connects the back yoke stacking regions RB in the circumferential direction C.

[0060] The adhesive member M that has entered between the back yoke laminated regions RB also spreads in the radial direction. The adhesive member M positioned between the back yoke laminated regions RB spreads between the teeth laminated regions RT where the teeth portions 12 overlap in the lamination direction.

[0061] In the adhesive member curing step S6, the adhesive member M injected in the adhesive member injection step S5 is cured to form the adhesive fixing part 30. The curing of the adhesive member M can be achieved by a known curing method and will not be described in detail, but can be achieved, for example, by promoting the reaction of the adhesive component over time or by heating, etc.

[0062] More specifically, in adhesive member hardening step S6, the adhesive member M attached to the inner wall surface of the slit groove 23 in adhesive member injection step S5 is hardened to form the slit groove adhesive portion 31. As a result, in adhesive member hardening step S6, the slit groove adhesive portion 31 can be formed, which extends from one end to the other end of the slit groove 23 in the stacking direction.

[0063] When the slit groove adhesive portion 31 is formed, the adhesive member M located in the radially outer groove portion 231 hardens to become the radially outer groove adhesive portion 311. Similarly, the adhesive member M located in the radially inner groove portion 232 hardens to become the radially inner groove adhesive portion 312.

[0064] In the adhesive member curing step S6, the adhesive member M that has entered between the stacked regions R1, R2 from the inner wall surface of the slit groove 23 is cured to form the area adhesive portion 32. The area adhesive portion 31 in the slit groove and the area adhesive portion 32 are connected to each other. The area adhesive portion 32 is connected to the multiple area adhesive portions 31 in the slit groove that are aligned in the circumferential direction C.

[0065] When the region adhesive portion 32 is formed, the adhesive material M located between the back yoke lamination regions RB hardens to become the back yoke lamination region adhesive portion 321. Similarly, the adhesive material M located between the teeth lamination regions RT hardens to become the teeth lamination region adhesive portion 322. The radially outer groove adhesive portion 311 and the back yoke lamination region adhesive portion 321 are connected to each other. The back yoke lamination region adhesive portion 321 and the teeth lamination region adhesive portion 322 are connected to each other. The back yoke lamination region adhesive portion 321 is connected in the circumferential direction C and is spirally continuous in the laminated core 1.

[0066] Through the above steps, the laminated core 1 is manufactured (END).

[0067] The laminated core 1 according to this embodiment is a cylindrical laminated core 1 formed by laminating core pieces 10, each having a plate-shaped back yoke portion 11 extending spirally around the axis P, a plurality of plate-shaped teeth 12 extending radially inward D1 from the back yoke portion 11 and aligned in the circumferential direction C, and a plurality of slits 13 extending radially outward D2 from an inner end face 111 of the back yoke portion 11 at positions between the base ends of the teeth 12 adjacent to each other in the circumferential direction C. The laminated core 1 has an adhesive fixing portion 30 that bonds regions of the core pieces 10 that overlap in the stacking direction (lamination regions R1, R2) together in the stacking direction. The adhesive fixing portion 30 has an adhesive portion 31 inside the slit groove 23 extending from one end to the other end in the stacking direction along the inner wall surface of the slit groove 23 in which multiple slits 13 are overlapped in the stacking direction, and an area adhesive portion 32 connected to the adhesive portion 31 inside the slit groove and positioned between the stacking areas R1 and R2 to adhere the stacking areas R1 and R2 to each other in the stacking direction.

[0068] In the above-described configuration, the adhesive fixing portion 30 is realized by stacking the iron core pieces 10 in a spiral shape, and then the adhesive material M injected from one end of the slit groove 23 in the stacking direction spreads between adjacent stacking regions R1, R2 of the iron core pieces 10 in the stacking direction.

[0069] This makes it possible to obtain a configuration in which the laminated regions R1, R2 are bonded to each other in the stacking direction by the region adhesive portion 32 without supplying adhesive material M between the laminated regions R1, R2 when stacking the iron core pieces 10.

[0070] Therefore, it is possible to provide a laminated core 1 that allows spiral core pieces to be bonded more easily.

[0071] Moreover, the adhesive portions 31 in the slit grooves can connect the area adhesive portions 32 located in the stacking direction in the stacking direction.

[0072] Therefore, the area adhesive portions 32 can be more firmly connected by the slit groove adhesive portions 31. Therefore, it is possible to provide a laminated core 1 that can more firmly bond the spiral core pieces 10.

[0073] In the laminated core 1 according to this embodiment, the slit grooves 23 have a radially outer groove portion 231 located at the radially outer end, and a radially inner groove portion 232 located radially inward of the radially outer groove portion 231. The average width L231 of the radially outer groove portion 231 is larger than the average width L232 of the radially inner groove portion 232.

[0074] As a result, the average width L231 of the radially outer groove portion 231 is larger than the average width L232 of the radially inner groove portion 232, making it easier to inject the adhesive member M into the radially outer groove portion 231. Therefore, the adhesive fixing portion 30 can be formed more easily.

[0075] In the laminated core 1 according to this embodiment, the slit groove adhesive portion 31 has a radially outer groove adhesive portion 311 extending along the inner wall surface of the radially outer groove portion 231 from one end to the other end in the lamination direction of the radially outer groove portion 231. The lamination regions R1, R2 include back yoke lamination regions RB where the back yoke portions 11 overlap in the lamination direction. The region adhesive portion 32 has a back yoke lamination region adhesive portion 321 connected to the radially outer groove adhesive portion 311 and positioned between the back yoke lamination regions RB to bond the back yoke lamination regions RB together in the lamination direction.

[0076] In the above-described configuration, the back yoke lamination region adhesive portions 321 connected to the radially outer groove adhesive portions 311 bond the back yoke lamination regions RB together in the stacking direction. This allows the back yoke lamination region adhesive portions 321 to more firmly bond the back yoke lamination regions RB together in the stacking direction, and the radially outer groove adhesive portions 311 to connect multiple back yoke lamination region adhesive portions 321 together in the stacking direction. This makes it possible to provide a laminated core 1 in which the stacked back yoke sections 11 are more firmly bonded in the stacking direction.

[0077] In the laminated core 1 according to this embodiment, the lamination regions R1, R2 include teeth laminated regions RT where the tooth portions 12 overlap in the lamination direction. The region bonding portion 32 is connected to the back yoke laminated region bonding portion 321 and has teeth laminated region bonding portions 322 located between the teeth laminated regions RT to bond the teeth laminated regions RT together in the lamination direction.

[0078] In the above-described configuration, the teeth lamination region adhesive portion 322 is connected to the back yoke lamination region adhesive portion 321 and adheres the teeth lamination regions RT to each other in the lamination direction. This allows the teeth lamination region adhesive portion 322 to more firmly adhere not only the back yoke lamination regions RB but also the teeth lamination regions RT to each other in the lamination direction. This makes it possible to provide a laminated core 1 in which the back yoke lamination regions RB and the teeth lamination regions RT are more firmly adhered to each other in the lamination direction.

[0079] In the laminated core 1 according to this embodiment, a plurality of slit grooves 23 are arranged in the circumferential direction C. The area adhesive portions 32 are connected to the slit groove adhesive portions 31 located respectively within the plurality of slit grooves 23 arranged in the circumferential direction C.

[0080] In the above-described configuration, the area adhesive portion 32 is connected to the plurality of slit groove adhesive portions 31 and is located between the plurality of slit groove adhesive portions 31 when viewed in the axial direction.

[0081] As a result, the multiple slit groove adhesive portions 31 can connect the area adhesive portions 32 more firmly in the stacking direction, and the area adhesive portions 32 can bond the laminated areas R1, R2 that overlap in the stacking direction of the core pieces 10 together over a wider range in the stacking direction. Therefore, it is possible to provide a laminated core 1 in which the laminated areas R1, R2 are bonded together even more firmly in the stacking direction.

[0082] In the laminated core 1 according to this embodiment, the slit groove inner adhesive portion 31 extends along the inner wall surface of the slit groove 23 from one end to the other end of the slit groove 23 in the lamination direction.

[0083] As a result, the area adhesive portion 32 can adhere the stacking areas R1 and R2 where the iron core pieces 10 overlap in the stacking direction from one end to the other end in the stacking direction, and the slit groove adhesive portion 31 can connect the area adhesive portion 32 more firmly in the stacking direction.

[0084] Therefore, it is possible to provide a laminated core 1 in which the spiral core pieces 10 are bonded from one end to the other end in the lamination direction.

[0085] The manufacturing method of the laminated core 1 according to this embodiment is a method for manufacturing a cylindrical laminated core 1 in which core pieces 10 are stacked, each core piece having a plate-shaped back yoke portion 11 extending spirally around the axis P, a plurality of plate-shaped tooth portions 12 extending radially inward D1 from the back yoke portion 11 and aligned in the circumferential direction C, and a plurality of slits 13 extending radially outward D2 from the inner end face of the back yoke portion 11 at positions between the base ends of adjacent tooth portions 12 in the circumferential direction C on the back yoke portion 11. This manufacturing method includes a steel plate punching process S2 in which a plate-shaped core piece forming portion 80 is formed by punching a steel plate 70, the plate-shaped core piece forming portion 80 having a strip-shaped back yoke forming portion 81 extending in one direction, a plurality of tooth forming portions 82 that protrude in one direction W1 from an end portion 811 on one side in the width direction of the back yoke forming portion 81 and are aligned in one direction, and a plurality of slit forming portions 83 that extend from the end portion 811 on one side in the width direction of the back yoke forming portion 81 toward the other side in the width direction W2 at positions between base ends of adjacent tooth forming portions 82 in the back yoke forming portion 81 in one direction; a bending process S3 in which gaps between the plurality of slit forming portions 83 in the core piece forming portion 80 formed in the steel plate punching process S2 are eliminated and the core piece forming portion 80 is bent into an arc shape when viewed in the stacking direction to form the core piece 10; and The method includes a stacking process S4 in which the formed core pieces 10 are stacked in the stacking direction; an adhesive material injection process S5 in which adhesive material M is injected from one end in the stacking direction into a slit groove 23 in which multiple slits 13 in the core pieces 10 stacked in the stacking process S4 overlap in the stacking direction, so that the adhesive material M penetrates between the stacking regions R1, R2 of the core pieces 10 that overlap in the stacking direction; and an adhesive material hardening process S6 in which the adhesive material M injected in the adhesive material injection process S5 is hardened to form an intra-slit groove adhesive portion 31 that extends along the inner wall surface of the slit groove 23 from one end in the stacking direction to the other end of the slit groove 23, and an area adhesive portion 32 that is integrally connected to the intra-slit groove adhesive portion 31 and is located between the stacking regions R1, R2 to bond the stacking regions R1, R2 to each other in the stacking direction.

[0086] According to the above-described method, when stacking the iron core pieces 10, it is possible to obtain a configuration in which the laminated regions R1 and R2 are bonded together in the stacking direction by the region adhesive portion 32 without supplying adhesive material M between the laminated regions R1 and R2 adjacent to each other in the stacking direction of the iron core pieces 10.

[0087] This makes it possible to more easily form the area adhesive portion 32. This makes it possible to provide a laminated core 1 to which the spiral core piece 10 can be more easily adhered.

[0088] Moreover, the area adhesive parts 32 located in the stacking direction can be connected in the stacking direction by the slit groove inner adhesive parts 31. Therefore, the area adhesive parts 32 can be connected more firmly by the slit groove inner adhesive parts 31.

[0089] Therefore, it is possible to provide a laminated core 1 to which the spiral core pieces 10 can be more firmly bonded.

[0090] In the manufacturing method of the laminated core 1 according to this embodiment, in the bending step S3, the gaps of the slit forming portions 83 are eliminated to form the average width L131 of the radially outer slit portions 131 located at the radially outer ends of the multiple slits 13 larger than the average width L132 of the radially inner slit portions 132 located radially inward D1 from the radially outer slit portions 131. In the laminating step S4, the core pieces 10 are laminated in the laminating direction to form radially outer groove portions 231, which are portions of the slit grooves 23 where the multiple radially outer slit portions 131 overlap in the laminating direction, and radially inner groove portions 232, which are portions of the slit grooves where the multiple radially inner slit portions 132 overlap in the laminating direction. In the adhesive member injection step S5, an adhesive member M is injected into the radially outer groove portions 231.

[0091] According to the above-described method, it is possible to obtain a configuration in which the average width L231 of the radially outer groove portion 231 formed by laminating the radially outer slit portion 131 is greater than the average width L232 of the radially inner groove portion 232 formed by laminating the radially inner slit portion 132. This makes it easier to inject the adhesive member M into the radially outer groove portion 231. Therefore, in the subsequent adhesive member hardening step S6, the slit groove adhesive portion 31 and the area adhesive portion 32 can be more easily formed.

[0092] In the manufacturing method of the laminated core 1 according to this embodiment, in the bending step S3, the back yoke forming portion 81 is bent into an arc shape when viewed in the stacking direction to form the back yoke portion 11. In the stacking step S4, the back yoke portion 11 formed in the bending step S3 is stacked in the stacking direction. In the adhesive member injection step S5, the adhesive member M injected into the radially outer groove 231 is inserted between the back yoke stacking regions RB of the back yoke portion 11 that overlap in the stacking direction. In the adhesive member hardening step S6, a radially outer groove inner adhesive portion 311 extending along the inner wall surface of the radially outer groove 231 and a back yoke stacking region adhesive portion 321 connected to the radially outer groove inner adhesive portion 311 and positioned between the back yoke stacking regions RB to bond the back yoke stacking regions RB in the stacking direction are formed.

[0093] As a result, the back yoke lamination regions RB can be more firmly bonded to each other in the stacking direction by the back yoke lamination region adhesive portions 321, and the multiple back yoke lamination region adhesive portions 321 can be integrally connected in the stacking direction by the radially outer groove adhesive portions 311. This makes it possible to provide a laminated core 1 in which the stacked back yoke sections 11 are more firmly bonded in the stacking direction.

[0094] In the manufacturing method of the laminated core 1 according to this embodiment, in the bending process S3, the core piece forming portion 80 is bent into an arc shape to form a plurality of tooth forming portions 82 aligned in one direction as a plurality of tooth portions 12 aligned in the circumferential direction C. In the stacking process S4, the tooth portions 12 are stacked in the stacking direction. In the adhesive member injection process S5, the adhesive member M injected into the radial outer grooves 231 is inserted between the back yoke stacking regions RB and into the spaces between the tooth stacking regions RT where the tooth portions 12 overlap in the stacking direction. In the adhesive member hardening process S6, tooth stacking region adhesion portions 322 are formed that are integrally connected to the back yoke stacking region adhesion portions 321 and are located between the tooth stacking regions RT to bond the tooth stacking regions RT together in the stacking direction.

[0095] This allows not only the back yoke lamination regions RB but also the teeth lamination regions RT to be more firmly bonded in the lamination direction by the teeth lamination region adhesive portion 322. Therefore, it is possible to provide a laminated core 1 in which the back yoke lamination regions RB and the teeth lamination regions RT are more firmly bonded in the lamination direction.

[0096] In the manufacturing method of the laminated core 1 according to this embodiment, in the laminating step S4, a plurality of slits 13 are laminated in the lamination direction to form a plurality of slit grooves 23 in the circumferential direction C. In the adhesive member injecting step S5, an adhesive member M is injected into the plurality of slit grooves 23 to connect the adhesive members M injected into the respective slit grooves 23 to each other between the lamination regions R1 and R2. In the adhesive member hardening step S6, a regional adhesive portion is formed that is connected to each of the in-slit groove adhesive portions located in the plurality of slit grooves.

[0097] As a result, the multiple slit groove adhesive portions 31 can connect the area adhesive portions 32 more firmly in the stacking direction, and the area adhesive portions 32 can bond the laminated areas R1, R2 that overlap in the stacking direction of the core pieces 10 together over a wider range in the stacking direction. Therefore, it is possible to provide a laminated core 1 in which the laminated areas R1, R2 are bonded together even more firmly in the stacking direction.

[0098] In the manufacturing method of the laminated core 1 according to this embodiment, in the adhesive member injection step S5, the adhesive member M is injected from one end to the other end in the stacking direction. In the adhesive member hardening step S6, an adhesive portion 31 in the slit groove 23 is formed, extending from one end to the other end in the stacking direction.

[0099] As a result, the region adhesive portions 32 can adhere the laminated regions R1, R2 where the core pieces 10 overlap in the stacking direction from one end to the other in the stacking direction, and the region adhesive portions 32 can be more firmly connected in the stacking direction by the slit groove adhesive portions 31. Therefore, it is possible to provide a laminated core 1 in which the spiral core pieces 10 are more firmly adhered from one end to the other in the stacking direction.

[0100] The motor according to this embodiment includes a stator having a laminated core 1, and a rotor positioned radially relative to the stator and rotating about an axis P of the laminated core 1.

[0101] This makes it possible to obtain a motor having a laminated core 1 with improved connection strength in the lamination direction.

[0102] (Other embodiments) Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify the above-described embodiments within the scope of the spirit of the present invention.

[0103] In the above embodiment, the slit groove adhesive portion 31 extends from one end of the slit groove 23 to the other end in the stacking direction along the inner wall surface of the slit groove 23. However, the slit groove adhesive portion may extend from one end of the slit groove 23 in the stacking direction to the other end along the inner wall surface of the slit groove. That is, the slit groove adhesive portion may extend, for example, along the inner wall surface of the slit groove from one end of the slit groove in the stacking direction to a position just before the other end. The slit groove adhesive portion may also extend in the stacking direction along at least a portion of the inner wall surface of the slit groove. For example, in a laminated core, the spiral core pieces may be bonded in the stacking direction by combining the slit groove adhesive portion extending in the stacking direction along at least a portion of the inner wall surface of the slit groove with an adhesive portion formed by a known adhesive application method such as spot application.

[0104] In the adhesive member injection step, the adhesive member may be injected along at least a part of the inner wall surface of the slit groove in the stacking direction.

[0105] In the embodiment described above, the slit groove adhesive portions 31 are located in each of the plurality of slit grooves 23 aligned in the circumferential direction C in the laminated core 1. However, the slit groove adhesive portions may be located in at least some of the plurality of slit grooves aligned in the circumferential direction in the laminated core.

[0106] In the adhesive member injection step, the adhesive member may be injected into at least some of the slit grooves arranged in the circumferential direction.

[0107] In the above embodiment, the region adhesive portion 32 includes a back yoke lamination region adhesive portion 321 and a teeth lamination region adhesive portion 322. However, the region adhesive portion may include only the back yoke lamination region adhesive portion without including the teeth lamination region adhesive portion.

[0108] In the above embodiment, the area bonding portion 32 is continuous in a spiral shape in the laminated core 1. However, the area bonding portion does not have to be continuous in a spiral shape in the laminated core 1. In other words, the area bonding portion may not be connected in the circumferential direction, but may bond at least a portion of the back yoke lamination regions together in the stacking direction.

[0109] The region adhesive portion may be located between the stacked regions and may adhere at least a portion of the stacked regions in the stacking direction.

[0110] In the above embodiment, the area adhesive portion 32 is connected to the slit groove adhesive portions 31 located in each of the circumferentially aligned slit grooves 23. However, the area adhesive portion may be connected to at least two or more slit groove adhesive portions among the circumferentially aligned slit grooves.

[0111] In the adhesive member injection step, an adhesive member may be injected into at least two or more of the plurality of slit grooves, and the adhesive member injected into each slit groove may penetrate between the stacked regions to connect the stacked regions to each other. In this way, in the adhesive member hardening step, a region adhesive portion may be formed that is integrally connected with each of the in-slit groove adhesive portions located in the two or more slit grooves.

[0112] This allows the area adhesive portions to be connected more firmly in the stacking direction by at least two or more slit groove adhesive portions while reducing the amount of adhesive material used, and the area adhesive portions can bond the stacked areas together over a wider range in the stacking direction.

[0113] The area adhesive portion may be connected to at least one of the slit groove inner adhesive portions among the plurality of slit grooves arranged in the circumferential direction.

[0114] In the above embodiment, an adhesive such as an anaerobic adhesive can be used as the adhesive member M. However, the adhesive member may be any adhesive as long as it has fluidity, can move along the inner wall surface of the slit groove, and can enter between the stacked regions.

[0115] [Configuration example] The present technology can also be configured as follows.

[0116] (1) The laminated core is a cylindrical laminated core in which core pieces are stacked, each having a plate-shaped back yoke portion extending spirally around an axis, a plurality of plate-shaped teeth extending radially inward from the back yoke portion and aligned circumferentially, and a plurality of slits extending radially outward from an inner peripheral end face of the back yoke portion at positions between base ends of adjacent teeth in the circumferential direction. The laminated core has an adhesive fixing portion that bonds overlapping regions of the core pieces in the stacking direction together in the stacking direction. The adhesive fixing portion has an inner slit groove adhesive portion that extends from one end of the slit groove to the other end in the stacking direction along an inner wall surface of the slit groove in which the plurality of slits overlap in the stacking direction, and a region adhesive portion that is connected to the inner slit groove adhesive portion and is located between the regions to bond at least a portion of the regions together in the stacking direction.

[0117] (2) In the laminated core described in (1), the slit grooves have a radially outer groove portion located at a radially outer end and a radially inner groove portion located radially inward of the radially outer groove portion, and the width of the radially outer groove portion is larger than the width of the radially inner groove portion.

[0118] (3) In the laminated core described in (2), the slit groove inner adhesive portion has a radially outer groove inner adhesive portion extending along the inner wall surface of the radially outer groove portion from one end to the other end in the lamination direction of the radially outer groove portion. The region includes a back yoke lamination region where the back yoke portion overlaps in the lamination direction. The region adhesive portion has a back yoke lamination region adhesive portion connected to the radially outer groove inner adhesive portion and located between the back yoke lamination regions to bond the back yoke lamination regions to each other in the lamination direction.

[0119] (4) In the laminated core described in (3), the region includes a teeth stacking region where the teeth portions overlap in the stacking direction, and the region adhesive portion has a teeth stacking region adhesive portion connected to the back yoke stacking region adhesive portion and positioned between the teeth stacking regions to adhere the teeth stacking regions to each other in the stacking direction.

[0120] (5) In the laminated core according to any one of (1) to (4), the slit grooves are arranged in a plurality in the circumferential direction, and the area adhesive portions are connected to the in-slit groove adhesive portions located in at least two of the plurality of slit grooves.

[0121] (6) In a laminated core described in any one of (1) to (5), the adhesive portion inside the slit groove extends along the inner wall surface of the slit groove from one end to the other end in the stacking direction of the slit groove.

[0122] (7) A method for manufacturing a laminated core is a method for manufacturing a cylindrical laminated core in which core pieces are stacked, each core piece having a plate-shaped back yoke portion extending spirally around an axis, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion and aligned circumferentially, and a plurality of slits extending radially outward from the inner end face of the back yoke portion at positions between the base ends of the circumferentially adjacent teeth portions in the back yoke portion. The manufacturing method of the laminated core includes a steel plate punching step of punching a steel plate to form a plate-shaped core piece forming portion having a band-shaped back yoke forming portion extending in one direction, a plurality of tooth forming portions that protrude in one direction in the width direction from an end portion on one side of the back yoke forming portion in the width direction and are aligned in the one direction, and a plurality of slit forming portions that extend from an end portion on one side of the back yoke forming portion in the width direction toward the other side of the width direction at positions between base ends of adjacent tooth forming portions in the back yoke forming portion in the one direction; a bending step of eliminating gaps in the plurality of slit forming portions in the core piece forming portions formed in the steel plate punching step and bending the core piece forming portion into an arc shape when viewed in the lamination direction to form the core pieces; and The method includes a stacking process for stacking the formed core pieces in the stacking direction; an adhesive material injection process for injecting adhesive material from one end in the stacking direction into slit grooves in which the multiple slits in the core pieces stacked in the stacking process overlap in the stacking direction, allowing the adhesive material to penetrate between regions of the core pieces that overlap in the stacking direction; and an adhesive material hardening process for hardening the adhesive material injected in the adhesive material injection process to form an inner slit groove adhesive portion that extends along the inner wall surface of the slit groove from one end to the other end in the stacking direction of the slit groove, and an area adhesive portion that is connected to the inner slit groove adhesive portion and is located between the regions to bond at least a portion of the regions in the stacking direction.

[0123] (8) In the manufacturing method of a laminated core described in (7), in the bending process, the gaps in the slit formation portions are eliminated to form the width of the radially outer slit portions located at the radially outer ends of the multiple slits larger than the width of the radially inner slit portions located radially inward of the radially outer slit portions. In the stacking process, the core pieces are stacked in the stacking direction to form radially outer groove portions where the multiple radially outer slit portions overlap in the stacking direction in the slit groove, and radially inner groove portions where the multiple radially inner slit portions overlap in the stacking direction in the slit groove. In the adhesive material injection process, the adhesive material is injected into the radially outer groove portions.

[0124] (9) In the method for manufacturing a laminated core described in (8), in the bending step, the back yoke portion is formed by bending the back yoke forming portion into an arc shape when viewed in the stacking direction. In the stacking step, the back yoke portion formed in the bending step is stacked in the stacking direction. In the adhesive member injection step, the adhesive member injected into the radially outer groove portion is inserted between back yoke stacking regions of the back yoke portion that overlap in the stacking direction. In the adhesive member hardening step, a radially outer groove inner adhesive portion extending along the inner wall surface of the radially outer groove portion and a back yoke stacking region adhesive portion connected to the radially outer groove inner adhesive portion and positioned between the back yoke stacking regions to bond the back yoke stacking regions in the stacking direction are formed.

[0125] (10) In the manufacturing method of a laminated core described in (9), in the bending process, the core piece forming portion is bent into the arc shape to form the multiple tooth forming portions aligned in one direction into the multiple tooth portions aligned in the circumferential direction. In the stacking process, the tooth portions are stacked in the stacking direction. In the adhesive material injection process, the adhesive material injected into the radially outer groove is introduced from between the back yoke stacking regions to between the tooth stacking regions where the tooth portions overlap in the stacking direction. In the adhesive material hardening process, a tooth stacking region adhesive portion is formed that is connected to the back yoke stacking region adhesive portion and is located between the tooth stacking regions to bond the tooth stacking regions in the stacking direction.

[0126] (11) In the manufacturing method of a laminated core according to any one of (7) to (10), in the laminating step, the slits are stacked in the lamination direction to form a plurality of the slit grooves in the circumferential direction. In the adhesive member injection step, the adhesive member is injected into at least two of the plurality of slit grooves to connect the adhesive members injected into the respective slit grooves to each other between the regions. In the adhesive member hardening step, the region adhesive portions connected to the respective in-slit groove adhesive portions located in the two or more slit grooves are formed.

[0127] (12) In the manufacturing method of a laminated core according to any one of (7) to (11), in the adhesive injection step, the adhesive is injected from the one end to the other end in the stacking direction, and in the adhesive hardening step, an adhesive portion in the slit groove is formed, extending from the one end to the other end in the stacking direction in the slit groove.

[0128] (13) A motor includes a stator having a laminated core according to any one of (1) to (6), and a rotor positioned radially relative to the stator and rotating around the axis of the laminated core. [Industrial Applicability]

[0129] The present invention is applicable to a laminated core formed by stacking spiral core pieces, a method for manufacturing the laminated core, and a motor using the laminated core. [Explanation of symbols]

[0130] 1 Laminated core 10 Core piece 11 Back yoke 12 Teeth 13 Slit 131 Radial outer slit 131 Radial inner slit 20 Laminated core body 23 Slit groove 231 radial outer groove 232 radial inner groove 30 Adhesive fixing part 31 Adhesion part inside slit groove 311 Adhesive part in radial outer groove 312 Radial inner groove adhesive part 32 area adhesive part 321 Back yoke lamination area adhesive 322 Teeth lamination area bonding 70 Steel plate (electromagnetic steel plate) 80 Core piece forming section 81 Back yoke forming part 82 Teeth forming part 83 Slit forming section R1 First stacking region (stacked region) R2 2nd lamination area (lamination area) RB back yoke lamination area RT Teeth Lamination Area F1 front page F2 2nd side T1 1st end surface T2 2nd end face E13, E23 connection points

Claims

1. a cylindrical laminated core in which core pieces are stacked, each core piece having a plate-shaped back yoke portion extending spirally around an axis, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion and aligned in the circumferential direction, and a plurality of slits extending radially outward from an end face on an inner circumferential side of the back yoke portion at positions between base ends of the teeth portions adjacent to each other in the circumferential direction, an adhesive fixing portion that bonds overlapping regions of the core pieces in the stacking direction together in the stacking direction; The adhesive fixing part is an adhesive portion inside the slit groove extending from one end to the other end in the stacking direction along an inner wall surface of the slit groove in which the plurality of slits are stacked in the stacking direction; an area adhesive portion connected to the slit groove adhesive portion and positioned between the areas to adhesively bond at least a portion of the areas in the stacking direction; having Laminated iron core.

2. 2. The laminated core according to claim 1, The slit groove is a radially outer groove portion located at a radially outer end portion, and a radially inner groove portion located radially inward of the radially outer groove portion, The width of the radially outer groove portion is greater than the width of the radially inner groove portion. Laminated iron core.

3. The laminated core according to claim 2, The adhesive portion in the slit groove is a radially outer groove inner adhesive portion extending along an inner wall surface of the radially outer groove portion from one end to the other end in the stacking direction, the region includes a back yoke stacking region in which the back yoke portion overlaps in the stacking direction, The area adhesive portion is a back yoke lamination region adhesive portion connected to the radially outer groove inner adhesive portion and positioned between the back yoke lamination regions to adhesively bond the back yoke lamination regions to each other in the lamination direction; Laminated iron core.

4. The laminated core according to claim 3, the region includes a teeth stacking region in which the teeth portions overlap in the stacking direction, The area adhesive portion is a teeth stacking region adhesive portion connected to the back yoke stacking region adhesive portion and positioned between the teeth stacking regions to adhesively connect the teeth stacking regions in the stacking direction; Laminated iron core.

5. 2. The laminated core according to claim 1, The slit grooves are arranged in a plurality in the circumferential direction, The area adhesive portion is The adhesive portion is connected to the adhesive portion in the slit groove, which is located in at least two or more of the plurality of slit grooves. Laminated iron core.

6. 2. The laminated core according to claim 1, The adhesive portion in the slit groove is extending along the inner wall surface of the slit groove from the one end to the other end in the stacking direction of the slit groove; Laminated iron core.

7. A manufacturing method for manufacturing a cylindrical laminated core in which core pieces are stacked, each core piece having a plate-shaped back yoke portion extending spirally around an axis, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion and aligned in the circumferential direction, and a plurality of slits extending radially outward from an end face on an inner circumferential side of the back yoke portion at positions between base ends of the circumferentially adjacent teeth portions in the back yoke portion, a steel plate punching process for forming a plate-shaped core piece forming portion by punching a steel plate, the plate-shaped core piece forming portion having: a strip-shaped back yoke forming portion extending in one direction; a plurality of teeth forming portions that protrude in one direction in the width direction from an end portion on one side of the back yoke forming portion in the width direction and are aligned in the one direction; and a plurality of slit forming portions that extend from the end portion on one side of the back yoke forming portion in the width direction toward the other side in the width direction at positions between base ends of adjacent tooth forming portions in the one direction in the back yoke forming portion; a bending process in which gaps in the plurality of slit formation portions in the core piece forming portion formed in the steel plate punching process are eliminated and the core piece forming portion is bent into an arc shape when viewed in the lamination direction to form the core pieces; a lamination step of laminating the iron core pieces formed in the bending step in the lamination direction; an adhesive material injection process in which an adhesive material is injected from one end in the stacking direction into slit grooves where the plurality of slits in the iron core pieces stacked in the stacking process overlap in the stacking direction, and the adhesive material is allowed to penetrate between areas of the iron core pieces that overlap in the stacking direction; an adhesive member hardening step of hardening the adhesive member injected in the adhesive member injection step to form an inner slit groove adhesive portion extending along the inner wall surface of the slit groove from one end to the other end of the slit groove in the stacking direction, and a region adhesive portion connected to the inner slit groove adhesive portion and positioned between the regions to bond at least a portion of the regions in the stacking direction; having Manufacturing method of laminated core.

8. 8. The method for manufacturing a laminated core according to claim 7, In the bending process, by eliminating the gaps in the slit forming portions, a width of a radially outer slit portion located at a radially outer end of the plurality of slits is formed to be larger than a width of a radially inner slit portion located radially inward of the radially outer slit portion, In the stacking process, by stacking the iron core pieces in the stacking direction, a radially outer groove portion is formed in the slit groove where a plurality of the radially outer slit portions overlap in the stacking direction, and a radially inner groove portion is formed in the slit groove where a plurality of the radially inner slit portions overlap in the stacking direction, In the adhesive injection step, the adhesive is injected into the radially outer groove portion. Manufacturing method of laminated core.

9. 9. The method for manufacturing a laminated core according to claim 8, In the bending step, the back yoke forming portion is bent into an arc shape when viewed in the stacking direction to form the back yoke portion, In the laminating step, the back yoke portion formed in the bending step is laminated in the laminating direction, In the adhesive material injection step, the adhesive material injected into the radially outer groove is introduced between back yoke stacking regions of the back yoke portion that overlap in the stacking direction, In the adhesive member hardening step, a radially outer groove inner adhesive portion extending along the inner wall surface of the radially outer groove portion and a back yoke stacking region adhesive portion connected to the radially outer groove inner adhesive portion and positioned between the back yoke stacking regions to bond the back yoke stacking regions to each other in the stacking direction are formed. Manufacturing method of laminated core.

10. 10. The method for manufacturing a laminated core according to claim 9, In the bending step, the core piece forming portion is bent into the arc shape to form the plurality of tooth forming portions aligned in the one direction as the plurality of tooth portions aligned in the circumferential direction, In the stacking step, the teeth are stacked in the stacking direction, In the adhesive material injection step, the adhesive material injected into the radially outer groove is introduced from between the back yoke stacking regions to between the teeth stacking regions where the teeth portions overlap in the stacking direction, In the adhesive member hardening step, a teeth stacking region adhesive portion is formed, the teeth stacking region adhesive portion being connected to the back yoke stacking region adhesive portion and being positioned between the teeth stacking regions to bond the teeth stacking regions together in the stacking direction. Manufacturing method of laminated core.

11. 8. The method for manufacturing a laminated core according to claim 7, In the stacking step, the plurality of slits are stacked in the stacking direction to form a plurality of slit grooves in the circumferential direction, In the adhesive member injection step, the adhesive member is injected into at least two or more of the plurality of slit grooves, and the adhesive members injected into the respective slit grooves are connected to each other between the regions, In the adhesive member hardening step, the area adhesive portions are formed so as to be connected to the respective in-slit groove adhesive portions located in the two or more slit grooves. Manufacturing method of laminated core.

12. 8. The method for manufacturing a laminated core according to claim 7, In the adhesive material injection step, the adhesive material is injected from the one end to the other end in the stacking direction, In the adhesive member hardening step, an adhesive portion in the slit groove is formed, the adhesive portion extending from the one end to the other end in the stacking direction of the slit groove. Manufacturing method of laminated core.

13. a stator having the laminated core according to any one of claims 1 to 6; a rotor positioned radially relative to the stator and rotating about the axis of the laminated core; A motor having

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