Manufacturing method of laminated core, laminated core, and motor

Abstract

To provide a manufacturing method capable of improving a coupling strength in a lamination direction in a laminated iron core having a back yoke part extending spirally about an axis.SOLUTION: A manufacturing method of a laminated core includes: a pressing step of punching out a plate-shaped iron core piece forming part having a belt-shaped back yoke forming part and a plurality of teeth parts from a steel plate; an iron core piece forming step of forming a spiral iron core piece having the back yoke part extending in a spiral shape and the plurality of teeth parts extending inward of a radial direction by bending the back yoke forming part in an arc shape; a laminating step of forming a cylindrical laminated body by laminating the back yoke part and the plurality of teeth parts of the spiral iron core piece in a thickness direction; an outer peripheral side adhesive agent supply step of supplying an adhesive agent to an outer peripheral surface of the laminated body constituted by an end surface on an outer peripheral side of the back yoke part; and an infiltration step of infiltrating the adhesive agent supplied to the outer peripheral surface of the laminated body into at least a part of a gap between regions of the iron core pieces overlapping each other in the lamination direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] There is a known method for manufacturing a laminated core in which a strip-shaped steel plate extending in one direction is bent into an arc to form a back yoke portion extending in a spiral shape. For example, Patent Document 1 discloses a laminated core manufactured by this method, 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, and a ring-shaped straight core is formed by combining a plurality of the arc-shaped blanked plates, and the outer periphery of the straight core is fixed by laser welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-143164 Summary of the Invention [Problem to be solved by the invention]

[0004] In a laminated core in which steel plates having a spiral back yoke and a plurality of teeth extending radially inward from the back yoke are stacked in the thickness direction, the inner circumferential side is easily fixed in place by coils wound around the teeth, while the outer circumferential side is easily separated in the stacking direction. Furthermore, in a laminated core in which the back yoke is formed spirally by bending a strip-shaped steel plate into an arc, springback that occurs in the back yoke can cause the steel plates to expand in the radial direction. Therefore, a manufacturing method that can improve the connection strength in the stacking direction for a laminated core having a spiral back yoke is needed.

[0005] An object of the present invention is to provide a manufacturing method capable of improving the connection strength in the lamination direction in a laminated core having a back yoke portion that extends spirally around an axis. [Means for solving the problem]

[0006] A laminated core manufacturing method according to one embodiment of the present invention is a method for manufacturing a cylindrical laminated core in which a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped tooth portions extending radially inward from the back yoke portion are stacked in the thickness direction and extend along the axis. The laminated core manufacturing method includes a press process for punching out from a steel plate a plate-shaped core piece forming portion having a band-shaped back yoke forming portion and the plurality of tooth portions protruding in the width direction from one widthwise end of the back yoke forming portion; a core piece forming process for bending the back yoke forming portion into an arc to form a spiral core piece having the back yoke portion extending spirally and the plurality of tooth portions extending radially inward; a stacking process for stacking the back yoke portions and the plurality of tooth portions of the spiral core pieces in the thickness direction to form a cylindrical laminate; an outer peripheral adhesive supplying process for supplying adhesive to the outer peripheral surface of the laminate formed by the outer peripheral end faces of the back yoke portions; and a penetration process for penetrating the adhesive supplied to the outer peripheral surface of the laminate into at least some of the gaps between areas of the core pieces that overlap in the stacking direction.

[0007] A laminated core according to one embodiment of the present invention includes a cylindrical laminate body extending along the axis, formed by stacking core pieces in a thickness direction, the laminate pieces having a plate-shaped back yoke portion extending spirally about an axis and a plurality of plate-shaped teeth extending radially inward from the back yoke portion, and adhesive portions bonding the laminate body in the stacking direction. The adhesive portions include outer peripheral adhesive portions located on the outer peripheral surface of the laminate body, which are formed by outer peripheral end faces of the back yoke portions located on the outer peripheral side of the core pieces, and back yoke adhesive portions located in at least some of the gaps between regions of the core pieces that overlap in the stacking direction, and whose radially outer sides are connected to the outer peripheral adhesive portions.

[0008] A motor according to one embodiment of the present invention includes a stator having the laminated core, and a rotor positioned radially relative to the stator and rotating about the axis of the laminated core. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a manufacturing method that can improve the connection strength in the lamination direction in a laminated core having a back yoke portion that extends spirally around an axis. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a laminated core according to the first embodiment. [Figure 2] FIG. 2 is an exploded view of the laminated core. [Figure 3] FIG. 3 is a partially enlarged view of FIG. 2, illustrating the adhesive portion. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a diagram of a punched steel plate. [Figure 6] FIG. 6 is a plan view showing a schematic configuration of the core piece forming portion. [Figure 7] FIG. 7 is a diagram illustrating a state in which the core piece forming portion is bent into an arc shape. [Figure 8] FIG. 8 is a diagram illustrating a spiral core piece. [Figure 9] FIG. 9 is a diagram illustrating how spiral core pieces are stacked in the thickness direction. [Figure 10] FIG. 10 is a diagram illustrating how adhesive is supplied to the outer peripheral surface of the laminate. [Figure 11] FIG. 11 is a diagram showing a state in which the adhesive supplied to the outer peripheral surface of the laminate has permeated into the gaps. [Figure 12] FIG. 12 is a view corresponding to FIG. 3 of a laminated core according to a modified example of the first embodiment. [Figure 13] FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. [Figure 14]FIG. 14 is a diagram illustrating a decompression step in the manufacturing method of the laminated core according to the second embodiment. [Figure 15] FIG. 15 is a view corresponding to FIG. 3 of a laminated core according to the third embodiment. [Figure 16] FIG. 16 is a diagram illustrating springback. [Figure 17] FIG. 17 is a diagram illustrating how adhesive is supplied to the teeth. [Figure 18] FIG. 18 is a diagram illustrating how adhesive is supplied to the outer peripheral surface of the laminate. [Figure 19] FIG. 19 is a diagram showing a state in which the adhesive supplied to the outer peripheral surface of the laminate has permeated into the gaps. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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.

[0012] In the following description, the direction parallel to the central axis P of the laminated core will be referred to as the axial direction, the direction perpendicular to the central axis P as the radial direction, and the direction along the arc centered on the central axis P as the circumferential direction.

[0013] 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.

[0014] (Embodiment 1) (Laminated core configuration) A laminated core 1 according to a first exemplary embodiment of the present invention will be described with reference to Figures 1 to 4. The laminated core 1 constitutes, for example, the stator of a motor having a rotor and a stator. The configuration of the motor is similar to that of a general motor, so a description thereof will be omitted.

[0015] 1, the laminated core 1 has a cylindrical shape extending along a central axis P. The laminated core 1 has a cylindrical lamination body 2 and an adhesive portion 3.

[0016] The laminate 2 has iron core pieces 4 that extend spirally around an axis and are stacked in the thickness direction and extend along the axis. The iron core pieces 4 have a plate-shaped back yoke portion 5 that extends spirally and a plurality of plate-shaped teeth 6. The plurality of plate-shaped teeth 6 extend radially inward from the end face on the inner peripheral side of the back yoke portion 5.

[0017] The laminate 2 has an outer peripheral surface 2a formed by the outer peripheral end faces 4a of the core pieces 4, and an inner peripheral surface 2b formed by the radially inner end faces 4b of the core pieces 4. The outer peripheral end faces 4a of the core pieces 4 are formed by the outer peripheral end faces of the back yoke section 5. Therefore, hereinafter, the outer peripheral end faces 4a of the core pieces 4 will also be referred to as the outer peripheral end face 4a of the back yoke section 5.

[0018] The back yoke portion 5 has a slit 7 extending radially outward from the inner peripheral end face between the base ends of circumferentially adjacent teeth 6. The back yoke portion 5 has a gap formed by the slit 7 that penetrates through in the thickness direction.

[0019] The core pieces 4 are formed by punching out a plate-shaped electromagnetic steel sheet, which is the material of the laminate 2, to form a strip-shaped core piece forming portion 82, and then winding the core piece forming portion 82 spirally in the thickness direction. Details of the manufacturing method of the core pieces 4 will be described later.

[0020] The spiral core pieces 4 are bonded in the stacking direction by adhesive parts 3. The adhesive parts 3 are solidified adhesive B. The adhesive B is an adhesive capable of bonding metals together. The adhesive B is, for example, an anaerobic adhesive.

[0021] The adhesive portion 3 is located on the outer peripheral surface 2a of the laminate 2 and in at least a part of the gap between overlapping regions of the core pieces 4 in the lamination direction. FIG.

[0022] (Structure of adhesive joint) Next, the adhesive portion 3 of the laminated core 1 having the above-described configuration will be described in detail.

[0023] In this embodiment, the adhesive portion 3 includes an outer peripheral adhesive portion 31, a back yoke adhesive portion 32, and a slit adhesive portion 33. The outer peripheral adhesive portion 31 is located on the outer peripheral surface 2a of the laminate 2. The back yoke adhesive portion 32 is located in the gap between regions of the core pieces 4 that overlap in the stacking direction. The slit adhesive portion 33 is located in the gap formed by the slit 7.

[0024] 1, the outer peripheral adhesive portion 31 is located on the outer peripheral surface 2a of the laminate 2 formed by the outer peripheral end faces 4a of the core pieces 4. That is, in this embodiment, the outer peripheral adhesive portion 31 covers the outer peripheral surface 2a of the laminate 2 from one end to the other end in the axial direction of the laminate 2. In this way, a cylindrical laminate 2 is formed.

[0025] The back yoke adhesive portion 32 is located in at least a part of the gap between overlapping regions of the core pieces 4 in the stacking direction. The radial outer side of the back yoke adhesive portion 32 is connected to the outer peripheral adhesive portion 31. As a result, the overlapping regions of the core pieces 4 are partially adhered in the stacking direction. An example of the back yoke adhesive portion 32 is shown in FIGS. 2 and 3.

[0026] The back yoke bonding portion 32 may extend irregularly or regularly radially inward from the outer circumferential side connected to the outer circumferential side bonding portion 31. The back yoke bonding portion 32 may extend linearly radially inward from the outer circumferential side. The back yoke bonding portion 32 may have a portion extending in the circumferential direction, or may have a portion extending, for example, to the teeth portion 6.

[0027] Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. In Fig. 4, the back yoke adhesive portion 32 has different lengths in the gaps between the regions that overlap in the stacking direction. However, the back yoke adhesive portion may have the same length in the gaps between the regions of the core pieces 4 that overlap in the stacking direction. Note that in an actual laminated core 1, the portions of the core pieces 4 that do not have adhesive portion 3 between the regions that overlap in the stacking direction may also be in contact. For the sake of explanation, Fig. 4 shows these portions separated from each other.

[0028] At least a portion of the gap adhesive portion 33 is located within the gap defined by the gap 7. The radially outer side of the gap adhesive portion 33 is connected to the outer peripheral adhesive portion 31. The gap adhesive portion 33 also extends radially inward along the gap 7. As a result, the gap 7 of the back yoke portion 5 is bonded in the circumferential direction.

[0029] Note that as long as at least a portion of the slit adhesive portion 33 is located within the gap formed by the slit 7, the other portion may be located on the surface of the back yoke portion 5 in the thickness direction.

[0030] The exemplary laminated core 1 according to this embodiment having the above configuration includes a cylindrical lamination 2 extending along the axis, formed by stacking core pieces 4 in the thickness direction, each lamination having a plate-shaped back yoke portion 5 extending spirally about the axis and a plurality of plate-shaped teeth 6 extending radially inward from the back yoke portion 5, and an adhesive portion 3 that bonds the laminations 2 in the stacking direction. The adhesive portion 3 includes an outer peripheral adhesive portion 31 located on the outer peripheral surface 2a of the lamination 2 formed by the outer peripheral end faces 4a of the back yoke portions 5 located on the outer peripheral side of the core pieces 4, and a back yoke adhesive portion 32 located in at least a portion of the gap between regions of the core pieces 4 that overlap in the stacking direction, the outer radial outer side of which is connected to the outer peripheral adhesive portion 31.

[0031] In a laminated core 1 having a back yoke portion 5 and a plurality of teeth 6 extending radially inward from the back yoke portion 5, the inner circumferential side is easily fixed in a laminated state by the coils wound around the teeth 6, while the outer circumferential side is easily separated in the lamination direction. In the above-described laminated core 1, the outer circumferential side where the back yoke portion 5 is located is bonded in the lamination direction by the adhesive portion 3. This makes it possible to obtain a laminated core 1 in which the outer circumferential side is bonded in the lamination direction. This makes it possible to obtain a laminated core 1 with improved connection strength in the lamination direction.

[0032] Furthermore, in the laminated core 1, the back yoke portion 5 has a slit 7 extending radially outward from the end face on the inner circumferential side between the base ends of circumferentially adjacent teeth portions 6. At least a portion of the adhesive portion 3 is located within the gap defined by the slit 7, and includes a slit adhesive portion 33 whose radially outer side is connected to the outer circumferential adhesive portion 31 and which extends radially inward along the slit 7.

[0033] The laminate 2, which has gaps 7 between circumferentially adjacent teeth 6 in the back yoke portion 5, is formed by spirally winding the strip-shaped back yoke portion 5. Therefore, in the laminate 2, springback that occurs in the back yoke portion 5 may cause the spiral core pieces 4 to expand radially. In the laminate 1 described above, the outer periphery side where the back yoke portion 5 is located is bonded by the adhesive portion 3. Therefore, compared to a laminated core in which the regions of the spiral core pieces 4 that overlap in the lamination direction are bonded at a position other than the outer periphery side, radial expansion of the back yoke portion 5 can be more accurately suppressed.

[0034] Therefore, it is possible to obtain a laminated core 1 with improved connection strength in the lamination direction.

[0035] Furthermore, a motor manufactured using the above-described laminated core 1 includes a stator having the laminated core 1 and a rotor positioned radially relative to the stator and rotating around the axis of the laminated core, thereby providing a motor with improved connection strength in the lamination direction.

[0036] (Laminated Core Manufacturing Method) Next, an exemplary method for manufacturing the laminated core 1 having the above-described configuration will be described with reference to FIGS.

[0037] The manufacturing method of the laminated core 1 includes a preparation step, a pressing step, a core piece forming step, a lamination step, an outer peripheral adhesive supplying step, and a penetration step.

[0038] In the preparation step, an electromagnetic steel sheet, which is a magnetic material, is prepared. In this embodiment, the electromagnetic steel sheet is a strip-like sheet that is long in one direction. Hereinafter, the electromagnetic steel sheet will be referred to as a steel sheet 80.

[0039] In the press process, the steel plate 80 is punched out to form a strip-shaped core piece forming portion 82. Fig. 5 is an example of a punched-out diagram of the core piece forming portion 82 in the steel plate 80. In Fig. 5, for the sake of explanation, the area of ​​the steel plate 80 that is punched out is shaded.

[0040] The pressing step is performed by press working. That is, in the pressing step, a punch is used to punch out the shaded areas in Fig. 5. A detailed description of the pressing step will be omitted.

[0041] In the press process, the region of the steel plate 80 is punched out to form a back yoke forming portion 83, a plurality of teeth 6, and a core piece forming portion 82 having a slit 84.

[0042] Fig. 6 is a diagram showing the schematic configuration of a punched core piece forming portion 82. As shown in Fig. 6, the back yoke forming portion 83 is strip-shaped and extends in the longitudinal direction of the steel plate 80. The multiple teeth portions 6 protrude in the width direction from one end of the back yoke forming portion 83 in the width direction. The width direction of the back yoke forming portion 83 is a direction that intersects with the longitudinal direction.

[0043] The slits 84 are formed between adjacent tooth portions 6 in the back yoke forming portion 83. The slits 84 extend from one end of the back yoke forming portion 83 in the width direction to the other end in the width direction. The back yoke forming portion 83 is bent into an arc shape and laminated in the thickness direction to form the back yoke portion 5 of the laminated core 1. The end face on the outer periphery of the back yoke forming portion 83 forms the outer periphery 2a of the laminate 2.

[0044] In the core piece forming process, as shown in FIG. 7 , when the core piece forming portion 82 is viewed in the thickness direction, the back yoke forming portion 83 is bent into an arc shape. At this time, the gaps of the slits 84 formed in the back yoke forming portion 83 are collapsed. As a result, the length of the radially inner end of the back yoke forming portion 83 becomes shorter than the length of the radially outer end. Therefore, the core piece forming portion 82 is formed into an arc shape when viewed in the thickness direction. Note that by collapsing the gaps of the slits 84, cuts 7 in the laminate 2 are formed. By continuously bending the core piece forming portion 82 into an arc shape in this way, as shown in FIG. 8 , a spiral core piece 4 is formed, which has a spirally extending back yoke portion 5 and a plurality of teeth 6 extending radially inward.

[0045] In the lamination process, as shown in Fig. 9, the spiral core pieces 4 are stacked in the thickness direction. Specifically, when viewed in the lamination direction, the multiple tooth portions 6 and the back yoke portion 5 are stacked in the thickness direction while aligning the circumferential positions of the multiple tooth portions 6. This forms a cylindrical laminate 2. Note that at this time, the laminate 2 is not bonded with an adhesive.

[0046] Next, in the outer periphery adhesive supplying process, adhesive B is supplied to the outer periphery surface 2a of the laminate 2, as shown in Fig. 10. The outer periphery surface 2a of the laminate 2 is formed by the outer periphery side end surface 4a of the back yoke portion 5 of the core piece 4. Therefore, in the outer periphery side adhesive supplying process, adhesive B is supplied to the outer periphery side end surface 4a of the back yoke portion 5.

[0047] Next, in the permeation step, as shown in FIG. 11, the adhesive B supplied to the outer peripheral surface 2a of the laminate 2 is permeated into at least some of the gaps between the regions of the core pieces 4 that overlap in the stacking direction.

[0048] In the spirally wound core pieces 4, gaps are formed between the overlapping regions in the lamination direction. Therefore, adhesive B supplied to the outer peripheral surface 2a of the laminate 2, where the spiral back yoke portion 5 is located on the outer peripheral side, penetrates into these gaps by capillary action. As a result, as shown in FIG. 11 , back yoke adhesive portion 32 is formed, the radially outer side of which is connected to outer peripheral adhesive portion 31 located on the outer peripheral surface 2a of the laminate 2.

[0049] The adhesive B that has permeated into at least a portion of the gap between the regions that overlap in the stacking direction also permeates into the slits 7. This forms slit adhesive portions 33 whose radial outer sides are connected to the outer peripheral adhesive portions 31 and whose at least a portion is located within the gap formed by the slits 7.

[0050] Through the above steps, the laminated core 1 is manufactured.

[0051] As described above, the manufacturing method of the exemplary laminated core 1 according to this embodiment is a manufacturing method of a cylindrical laminated core 1 that extends along the axis by stacking, in the thickness direction, a plate-shaped back yoke portion 5 that extends spirally around the axis and a plurality of plate-shaped teeth portions 6 that extend radially inward from the back yoke portion 5. The manufacturing method of the laminated core 1 includes a pressing process, a core piece forming process, a lamination process, an outer peripheral adhesive supplying process, and a penetration process.

[0052] In the pressing process, a steel plate 80 is punched out of a strip-shaped back yoke forming portion 83 and a plate-shaped core piece forming portion 82 having a plurality of teeth 6 protruding in the width direction from one widthwise end of the back yoke forming portion 83. In the core piece forming process, the back yoke forming portion 83 is bent into an arc shape to form a spiral core piece 4 having a spirally extending back yoke portion 5 and a plurality of teeth 6 extending radially inward. In the stacking process, the back yoke portion 5 and the plurality of teeth 6 of the spiral core piece 4 are stacked in the thickness direction to form a cylindrical laminate 2. In the outer periphery adhesive supplying process, adhesive B is supplied to the outer periphery surface 2a of the laminate 2, which is formed by the outer periphery end face 4a of the back yoke portion 5. In the permeation process, adhesive B supplied to the outer periphery surface 2a of the laminate 2 is permeated into at least some of the gaps between regions of the core pieces 4 that overlap in the stacking direction.

[0053] In a laminated core 1 having a back yoke portion 5 and a plurality of teeth 6 extending radially inward from the back yoke portion 5, the inner peripheral side is easily fixed in a laminated state by the coils wound around the teeth 6, while the outer peripheral side is easily separated in the lamination direction. Also, in a laminated core 1 having core pieces 4 in which the back yoke portion 5 is formed in a spiral shape by bending the strip-shaped back yoke forming portion 83, springback occurring in the back yoke portion 5 may cause the core pieces 4 to expand radially.

[0054] In the above-described method, adhesive B is supplied to the outer peripheral surface 2a of the laminate 2 having the core pieces 4 stacked in the thickness direction with the spiral back yoke portion 5 located on the outer periphery. This makes it possible to easily fix the back yoke portion 5 located on the outer periphery of the laminate 2 in the stacking direction and radial direction.

[0055] Furthermore, in the spirally wound core pieces 4, gaps are generated between the regions that overlap in the stacking direction. Therefore, adhesive B supplied to the outer peripheral surface 2a of the laminate 2, where the spiral back yoke portion 5 is located on the outer peripheral side, can penetrate into these gaps by capillary action. Therefore, the outer peripheral side of the laminate 2 can be bonded in the stacking direction by adhesive B. This makes it possible to obtain a laminated core 1 in which the outer peripheral side of the laminate 2, where the back yoke portion 5 is located on the outer peripheral side, is bonded in the stacking direction.

[0056] Therefore, it is possible to provide a manufacturing method that can improve the connection strength in the lamination direction in a laminated core 1 having a back yoke portion 5 that extends spirally around an axis.

[0057] (Modification of the first embodiment) (laminated core) 12 and 13 show a laminated core 101 according to a modification of embodiment 1. In this modification, the laminate 2 of the laminated core 101 has adhesive portions 103 also located on the inner circumferential surface 2b. In the following, a description of the same configuration as in embodiment 1 will be omitted, and only the configuration different from embodiment 1 will be described.

[0058] As shown in FIG. 12, the laminated core 101 has a laminate 2 and an adhesive portion 103.

[0059] In this embodiment, the adhesive portion 103 includes an outer periphery adhesive portion 31, a back yoke adhesive portion 32, a slit adhesive portion 33, an inner periphery adhesive portion 134, and a tooth adhesive portion 135. The inner periphery adhesive portion 134 is located on the inner periphery surface 2b of the laminate 2. The tooth adhesive portion 135 is located in the gap between regions of the core pieces 4 on the inner periphery that overlap in the stacking direction.

[0060] Specifically, as shown in Figure 13, the inner peripheral adhesive portion 134 covers the radially inner end faces 4b of the tooth portions 6 that overlap in the thickness direction, from one end to the other in the axial direction of the laminate 2.

[0061] The radially inner side of the tooth bonding portion 135 is connected to the inner peripheral side bonding portion 134. An example of the tooth bonding portion 135 is shown in FIGS.

[0062] 12, tooth bonding portion 135 may extend radially outward in a straight line from the inner periphery where it is connected to inner periphery-side bonding portion 134, or may spread out irregularly (not shown). Tooth bonding portion 135 may have a portion that extends circumferentially, or may have a portion that extends to back yoke portion 5, for example.

[0063] Fig. 13 is a cross-sectional view taken along line XIII-XIII in Fig. 12. In Fig. 13, the tooth bonding portions 135 have different lengths in the gaps between the regions that overlap in the stacking direction. However, the tooth bonding portions may have the same length in the gaps between the regions of the core pieces that overlap in the stacking direction. Note that in an actual laminated core 101, the portions of the core pieces 4 where adhesive B is not located between the regions that overlap in the stacking direction may also be in contact. For the sake of explanation, Fig. 13 shows these portions separated.

[0064] That is, in the laminated core 101 according to this modified example, the adhesive portion 103 includes an inner adhesive portion 134 located on the inner surface 2b of the laminate 2 formed by the radially inner end faces 4b of the tooth portions 6 that overlap in the stacking direction.

[0065] This results in a configuration in which the inner periphery of the laminate 2 is also bonded by the adhesive portion 103. Therefore, it is possible to obtain a laminated core 101 with improved connection strength in the lamination direction.

[0066] (Laminated Core Manufacturing Method) The manufacturing method of the laminated core 101 having the above-described configuration includes an inner circumferential adhesive supplying step in addition to the preparation step, pressing step, core piece forming step, lamination step, outer circumferential adhesive supplying step, and infiltration step, as in embodiment 1. The inner circumferential adhesive supplying step is performed after the lamination step.

[0067] That is, in this modification, the manufacturing method of the laminated core 101 includes a preparation step, a pressing step, a core piece forming step, a lamination step, an inner periphery adhesive supplying step, an outer periphery adhesive supplying step, and a penetration step. The preparation step, pressing step, core piece forming step, lamination step, and outer periphery adhesive supplying step are the same steps as in embodiment 1, and therefore description thereof will be omitted.

[0068] In the inner circumferential adhesive supplying step, adhesive B is also supplied to the inner circumferential surface 2b of the laminate 2, similar to the outer circumferential adhesive supplying step of embodiment 1. The inner circumferential surface 2b of the laminate 2 is formed by the radially inner end faces 4b of the teeth 6 of the core pieces 4. Therefore, in the inner circumferential adhesive supplying step, adhesive B is supplied to the radially inner end faces 4b of the teeth 6.

[0069] The inner circumferential adhesive supplying step may be performed simultaneously with the outer circumferential adhesive supplying step, or may be performed after the outer circumferential adhesive supplying step.

[0070] Next, in the penetration step, the adhesive B supplied to the outer peripheral surface 2a and inner peripheral surface 2b of the laminate 2 is allowed to penetrate at least some of the gaps between the regions of the core pieces 4 that overlap in the stacking direction. That is, in the spirally wound core pieces 4, gaps are generated between the regions that overlap in the stacking direction. Therefore, the adhesive B supplied to the outer peripheral surface 2a and inner peripheral surface 2b of the laminate 2 penetrates into the gaps by capillary action.

[0071] As a result, as shown in Figure 13, in addition to the outer peripheral adhesive portion 31, the back yoke adhesive portion 32, and the slit adhesive portion 33, an inner peripheral adhesive portion 134 extending in the stacking direction on the inner surface 2b of the laminate 2, and a tooth adhesive portion 135 whose radially inner side is connected to the inner peripheral adhesive portion 134 are formed.

[0072] Through the above steps, the laminated core 101 is manufactured.

[0073] As described above, the manufacturing method of the laminated core 1 according to this modified example further includes, after the stacking process, an inner adhesive supplying process in which adhesive B is supplied to the inner surface 2b of the laminate 2 formed by the radially inner end faces of multiple tooth portions 6 stacked in the stacking direction.

[0074] This allows the inner periphery of the laminate 2 to also be bonded by the adhesive portion 103. Therefore, the connection strength of the laminated core 101 in the lamination direction can be further improved.

[0075] (Embodiment 2) Next, a method for manufacturing an exemplary laminated core 201 according to embodiment 2 will be described with reference to Fig. 14. The method for manufacturing the laminated core 201 includes a preparation step, a pressing step, a core piece forming step, a lamination step, an outer peripheral adhesive supplying step, and a penetration step, similar to embodiment 1. The preparation step, pressing step, core piece forming step, lamination step, and outer peripheral adhesive supplying step are similar to those of embodiment 1, and therefore descriptions thereof will be omitted.

[0076] The infiltration step of this embodiment includes a decompression step of decompressing the air in the gaps between the overlapping regions in the stacking direction.

[0077] Specifically, as shown in FIG. 14, adhesive B is supplied to the outer peripheral surface 2a of the laminate 2, and the adhesive B permeates into the gaps by capillary action. At this time, the air in the gaps in the overlapping regions in the stacking direction is evacuated using, for example, a vacuum pump T1. This allows the overlapping regions of the core pieces 4 in the stacking direction to be brought closer together. This allows the range of permeation of adhesive B in the gaps to be increased.

[0078] In this way, by reducing the pressure in the gaps between the overlapping regions of the core pieces 4 in the stacking direction, the adhesive B can penetrate into a wider area of ​​the gaps, thereby making it possible to bond the spiral core pieces 4 more firmly in the stacking direction.

[0079] The decompression step may be carried out, for example, by supplying adhesive B to the outer peripheral surface 2a of the laminate 2, and then placing the laminate 2 in a vacuum device.

[0080] (Embodiment 3) Next, an exemplary laminated core 301 according to embodiment 3 will be described with reference to Fig. 15 to Fig. 19. In this embodiment, the adhesive portion 303 of the laminated core 301 has a tooth adhesive portion 335 that adhesively bonds together teeth that overlap in the lamination direction in the lamination direction. Below, a description of the same configuration as in embodiment 1 will be omitted, and only the configuration that differs from embodiment 1 will be described.

[0081] As shown in FIG. 15, the laminated core 301 has a laminate 2 and an adhesive portion 303 .

[0082] In this embodiment, the adhesive portion 303 includes an outer periphery adhesive portion 31, a back yoke adhesive portion 32, a slit adhesive portion 33, and a tooth adhesive portion 335. The tooth adhesive portion 335 is located between the tooth portions 6 of the core segments 4 that overlap in the stacking direction.

[0083] That is, the adhesive portion 303 includes, in addition to the outer peripheral adhesive portion 31, the back yoke adhesive portion 32, and the slit adhesive portion 33, a tooth adhesive portion 335 located between the tooth portions 6 overlapping in the stacking direction and bonding the tooth portions 6 overlapping in the stacking direction in the stacking direction.

[0084] This results in a configuration in which the teeth 6 are bonded to each other in the lamination direction in the laminated core 301. Therefore, it is possible to obtain a laminated core 301 with improved connection strength in the lamination direction.

[0085] (Laminated Core Manufacturing Method) The manufacturing method of laminated core 301 having the above-described configuration includes a teeth adhesive supplying process in addition to the preparation process, pressing process, core piece forming process, lamination process, outer periphery adhesive supplying process, and infiltration process, as in embodiment 1. The teeth adhesive supplying process is performed between the core piece forming process and the lamination process.

[0086] That is, in this embodiment, the manufacturing method of the laminated core 301 includes a preparation step, a pressing step, a core piece forming step, a teeth adhesive supplying step, a lamination step, an outer periphery adhesive supplying step, and a penetration step. The preparation step, pressing step, outer periphery adhesive supplying step, and penetration step are the same steps as in embodiment 1, so their explanations are omitted.

[0087] The core pieces 4 that are bent into an arc shape in the thickness direction in the core piece forming process may spring back to their original shape and expand in the radial direction, as shown in Fig. 16. This may make it difficult to stack multiple tooth portions 6 accurately in the thickness direction in the stacking process.

[0088] Furthermore, there may be variations in the gap dimensions between overlapping regions of the spiral core pieces 4 in the stacking direction, which may result in the adhesive B supplied to the outer peripheral surface 2a of the laminate 2 not penetrating evenly into the gaps between overlapping regions of the core pieces 4 in the stacking direction during the penetration step.

[0089] In contrast, in this embodiment, the manufacturing method of the laminated core 301 includes a teeth adhesive supplying step between the core piece forming step and the laminating step.

[0090] In the teeth adhesive supplying step, as shown in FIG. 17, an adhesive B is supplied to at least one of the surfaces on one side in the thickness direction of the plurality of teeth 6 or the surfaces on the other side in the thickness direction using an adhesive supplying device T2.

[0091] In the stacking step, the teeth 6, each having adhesive B applied to at least one of the surfaces on one side in the thickness direction or the other side in the thickness direction, are stacked in the thickness direction.

[0092] This makes it possible to prevent springback from occurring in the core pieces 4. That is, as shown in FIG. 18, adhesive B can be supplied to the outer peripheral surface 2a of the core pieces 4 in a state in which multiple tooth portions 6 are precisely overlapped in the stacking direction. Also, the gap dimensions between the regions of the core pieces 4 that overlap in the stacking direction can be made more uniform. Therefore, as shown in FIG. 19, in the penetration process, adhesive B can be spread more uniformly within the gaps between the regions that overlap in the stacking direction.

[0093] That is, the manufacturing method of the laminated core 301 according to this embodiment further includes, prior to the laminating step, a teeth adhesive supplying step of supplying adhesive B to at least one of the surfaces on one thickness side or the other thickness side of the plurality of teeth 6. In the laminating step, the plurality of teeth 6 having adhesive B supplied to at least one of the surfaces on one thickness side or the other thickness side are stacked in the thickness direction.

[0094] This allows adhesive to be supplied to the outer peripheral surface 2a of the laminate 2 in a state where the tooth portions 6 that overlap in the stacking direction are bonded to each other in the stacking direction. Therefore, when adhesive B is supplied to the outer peripheral surface 2a of the laminate 2, springback occurs in the spiral core pieces 4, and it is possible to prevent the core pieces 4 from expanding in the radial direction. This improves the workability of supplying adhesive B to the outer peripheral surface 2a of the laminate 2.

[0095] Furthermore, because the core pieces 4 are bonded in the stacking direction at the tooth portions 6, it is possible to prevent variations in the gap dimensions between overlapping areas in the stacking direction. This allows the adhesive B to penetrate more evenly into the gaps. Therefore, it is possible to prevent variations in the connection strength of the laminated core 301.

[0096] (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.

[0097] In each of the above-described embodiments, the laminate 2 has a gap 7 extending radially outward from the inner peripheral end face of the back yoke portion 5 between the base ends of the teeth portions 6 that are adjacent in the circumferential direction of the back yoke portion 5. However, the laminate does not have to have a gap.

[0098] In each of the above-described embodiments, the adhesive portion 3, 103, 303 includes a gap adhesive portion 33 that is at least partially located within the gap defined by the gap 7. However, the adhesive portion does not necessarily have to include a gap adhesive portion.

[0099] In the tooth adhesive supplying process of the third embodiment, adhesive B is supplied to the multiple tooth portions 6 in the core piece forming portion 82 before it is bent into an arc shape. However, in the tooth adhesive supplying process, adhesive may also be supplied to the multiple tooth portions of the arc-shaped core piece.

[0100] (Configuration example) The present technology can also be configured as follows.

[0101] (1) The method for manufacturing a laminated core is a method for manufacturing a cylindrical laminated core in which a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion are stacked in the thickness direction to extend along the axis. The laminated core manufacturing method includes a press process for punching out from a steel plate a plate-shaped core piece forming portion having a band-shaped back yoke forming portion and the plurality of tooth portions protruding in the width direction from one widthwise end of the back yoke forming portion; a core piece forming process for bending the back yoke forming portion into an arc to form a spiral core piece having the back yoke portion extending spirally and the plurality of tooth portions extending radially inward; a stacking process for stacking the back yoke portions and the plurality of tooth portions of the spiral core pieces in the thickness direction to form a cylindrical laminate; an outer peripheral adhesive supplying process for supplying adhesive to the outer peripheral surface of the laminate formed by the outer peripheral end faces of the back yoke portions; and a penetration process for penetrating the adhesive supplied to the outer peripheral surface of the laminate into at least some of the gaps between areas of the core pieces that overlap in the stacking direction.

[0102] (2) In the laminated core manufacturing method described in (1), the infiltration step includes a decompression step of decompressing the air in the gaps in the overlapping regions in the lamination direction.

[0103] (3) The laminated core manufacturing method according to (1) or (2) further includes a teeth adhesive supplying step of supplying adhesive to at least one of the surfaces on one side or the other side in the thickness direction of the plurality of teeth before the laminating step. In the laminating step, the plurality of teeth with adhesive supplied to at least one of the surfaces on one side or the other side in the thickness direction are stacked in the thickness direction.

[0104] (4) In the laminated core manufacturing method described in (1) or (2), after the lamination process, an inner circumferential adhesive supply process is further included in which adhesive is supplied to the inner circumferential surface of the laminate formed by the radially inner end faces of the plurality of tooth portions stacked in the lamination direction.

[0105] (5) The laminated core has a cylindrical laminate extending along the axis, formed by stacking core pieces in the thickness direction, each having a plate-shaped back yoke portion extending spirally around the axis and a plurality of plate-shaped teeth extending radially inward from the back yoke portion, and adhesive portions that bond the laminate in the stacking direction. The adhesive portions include outer peripheral adhesive portions located on the outer peripheral surface of the laminate, which are formed by outer peripheral end faces of the back yoke portions located on the outer peripheral side of the core pieces, and back yoke adhesive portions located in at least some of the gaps between regions of the core pieces that overlap in the stacking direction, and whose radially outer sides are connected to the outer peripheral adhesive portions.

[0106] (6) In the laminated core described in (5), the back yoke portion has a gap extending radially outward from an end face on the inner periphery between base ends of circumferentially adjacent teeth, and the adhesive portion includes a gap adhesive portion at least partially located within a gap defined by the gap, the radially outer side of which is connected to the outer periphery adhesive portion, and which extends radially inward along the gap.

[0107] (7) In the laminated core described in (5) or (6), the adhesive portion includes a tooth adhesive portion located between tooth portions that overlap in the stacking direction and that bonds the tooth portions that overlap in the stacking direction in the stacking direction.

[0108] (8) In the laminated core described in (5) or (6), the adhesive portion includes an inner adhesive portion located on the inner surface of the laminate formed by the radially inner end faces of the tooth portions overlapping in the stacking direction.

[0109] (9) A motor includes a stator having a laminated core according to any one of (5) to (8), and a rotor positioned radially relative to the stator and rotating around the axis of the laminated core. [Industrial Applicability]

[0110] The present invention is applicable to a manufacturing method of a laminated core obtained by punching out a strip-shaped electromagnetic steel sheet and having a back yoke portion extending linearly in the longitudinal direction of the electromagnetic steel sheet and a plurality of teeth extending in the width direction of the electromagnetic steel sheet. [Explanation of symbols]

[0111] 1, 101, 201, 301 laminated core 2. Laminate 2a Outer surface 2b Inner surface 3, 103, 303 Adhesive part 31 Outer circumferential adhesive part 32 Back yoke adhesive part 33 Cut adhesive part 4 Core pieces 4a End face on the outer periphery 4b Radial inner end face 5 Back yoke 6 Teeth 7. Cut 80 steel plate 82 Core piece forming section 83 Back yoke forming part 84 Slit 134 Inner circumferential adhesive part 135 Teeth bonding part 335 Teeth bonding part T1 Vacuum Pump T2 adhesive supply unit

Claims

1. A method for manufacturing a cylindrical laminated core extending along the axis, in which a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion are laminated in a thickness direction, a press process for punching out from a steel plate a strip-shaped back yoke forming portion and a plate-shaped core piece forming portion having the plurality of teeth protruding in the width direction from one end of the back yoke forming portion in the width direction; a core piece forming process in which the back yoke forming portion is bent into an arc shape to form a spiral core piece having the back yoke portion extending spirally and the plurality of teeth portions extending radially inward; a lamination step of stacking the back yoke portion and the plurality of teeth portions of the spiral core segments in a thickness direction to form a cylindrical laminate; an outer peripheral adhesive supplying step of supplying adhesive to an outer peripheral surface of the laminate constituted by an outer peripheral end surface of the back yoke portion; a penetration step of penetrating the adhesive supplied to the outer peripheral surface of the laminate into at least a part of the gaps between regions of the core pieces that overlap in the stacking direction; having Laminated core manufacturing method.

2. 2. The laminated core manufacturing method according to claim 1, The infiltration step includes: a decompression step of decompressing the air in the gaps in the overlapping regions in the stacking direction, Laminated core manufacturing method.

3. 3. The laminated core manufacturing method according to claim 1 or 2, The method further includes a teeth adhesive supplying step of supplying adhesive to at least one of a surface on one side in a thickness direction of the plurality of teeth portions or a surface on the other side in the thickness direction thereof, prior to the laminating step; In the lamination step, The plurality of teeth having adhesive applied to at least one of a surface on one side in the thickness direction or a surface on the other side in the thickness direction are stacked in the thickness direction. Laminated core manufacturing method.

4. 3. The laminated core manufacturing method according to claim 1 or 2, The method further includes, after the stacking step, an inner circumferential adhesive supplying step of supplying adhesive to an inner circumferential surface of the laminate formed by radially inner end faces of the plurality of teeth overlapping in the stacking direction. Laminated core manufacturing method.

5. a cylindrical laminate extending along the axis, in which core pieces are laminated in a thickness direction, the core pieces having a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth extending radially inward from the back yoke portion; an adhesive portion that bonds the laminate in a stacking direction; and The adhesive portion is an outer peripheral adhesive portion located on the outer peripheral surface of the laminate, the outer peripheral adhesive portion being formed by the outer peripheral end surface of the back yoke portion located on the outer peripheral side of the core pieces; a back yoke adhesive portion located in at least a portion of a gap between regions of the core pieces that overlap in the stacking direction, the back yoke adhesive portion having a radially outer side connected to the outer periphery adhesive portion; Including, Laminated iron core.

6. The laminated core according to claim 5, The back yoke portion is A gap is provided between base ends of circumferentially adjacent teeth, the gap extending radially outward from an end face on the inner circumferential side, The adhesive portion is and a slit adhesive portion at least a portion of which is located within the gap defined by the slit, the radially outer side of which is connected to the outer peripheral adhesive portion, and which extends radially inward along the slit. Laminated iron core.

7. The laminated core according to claim 5, The adhesive portion is a teeth bonding portion located between the teeth portions overlapping in the stacking direction and bonding the teeth portions overlapping in the stacking direction in the stacking direction; Laminated iron core.

8. The laminated core according to claim 5, The adhesive portion is an inner peripheral adhesive portion located on an inner peripheral surface of the laminate constituted by radially inner end faces of the teeth portions overlapping in the stacking direction, Laminated iron core.

9. a stator having the laminated core according to any one of claims 5 to 8; a rotor positioned radially relative to the stator and rotating about the axis of the laminated core; A motor having

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