Manufacturing method of laminated core, laminated core, and motor

Abstract

To provide a manufacturing method capable of efficiently manufacturing a laminated iron core having a back yoke part extending spirally about an axis.SOLUTION: A manufacturing method of a laminated iron core includes: a pressing step of punching out, from a steel plate, a plate-shaped iron core piece forming part having a belt-shaped back yoke forming part and a plurality of teeth parts protruding in a width direction from an end part on one side in the width direction of the back yoke forming part; 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 in a radial direction by bending the back yoke forming part in an arc shape; an outer peripheral part adhesive supplying step of supplying an adhesive agent to an outer peripheral part of the back yoke part located on the outer peripheral side of the spiral iron core piece; and a laminating step of forming a cylindrical laminated body by laminating the back yoke part and the plurality of teeth parts at which the adhesive agent is supplied to the outer peripheral part in a thickness direction.SELECTED DRAWING: Figure 5

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] However, a spiral-shaped back yoke portion is prone to separating in the stacking direction. Furthermore, if the back yoke portion is formed spirally by bending a strip-shaped steel plate into an arc, springback that occurs in the back yoke portion can cause the back yoke portion to expand in the radial direction. Therefore, in the process of connecting laminated cores having spiral-shaped back yoke portions in the stacking direction, the back yoke portion must be fixed in both the stacking direction and the radial direction, which presents a problem of poor workability. Therefore, there is a need for a manufacturing method that can efficiently manufacture laminated cores having back yoke portions that extend spirally around an axis.

[0005] An object of the present invention is to provide a manufacturing method capable of efficiently manufacturing 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 extending along the axis, in which 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 are stacked in the thickness direction, The laminated core manufacturing method includes a press process for punching out from a steel sheet a plate-shaped core piece forming portion having a strip-shaped back yoke forming portion and the plurality of teeth 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 spiral core pieces having the spirally extending back yoke portion and the plurality of teeth extending radially inward, an outer periphery adhesive supplying process for supplying adhesive to an outer periphery of the back yoke portion located on the outer periphery of the spiral core pieces, and a stacking process for stacking the back yoke portion and the plurality of teeth with adhesive supplied to their outer peripheries in the thickness direction to form a cylindrical laminate.

[0007] A laminated core according to one embodiment of the present invention includes a cylindrical laminate body extending along the axis, the laminate body being formed by stacking core pieces in the thickness direction, the core 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 an adhesive portion that bonds the laminate body in the stacking direction. The adhesive portion includes a back yoke adhesive portion that extends spirally about the axis and overlaps in the stacking direction with an outer periphery of the spiral back yoke portion located on the outer periphery of the laminate body, and an outer periphery surface adhesive portion that is located on the outer periphery of the laminate body and connects radially outer ends of the spiral back yoke adhesive portion in the stacking direction.

[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 capable of efficiently manufacturing 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 a view of the laminated core viewed in the axial direction. [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 perspective view showing a schematic configuration of the roll member and the storage section, and is a diagram illustrating the relationship between the core piece forming section, the roll member, and the storage section. [Figure 6] FIG. 6 is a partially enlarged view of FIG. [Figure 7] FIG. 7 is a diagram of a punched steel plate. [Figure 8] FIG. 8 is a plan view showing a schematic configuration of the core piece forming portion. [Figure 9] FIG. 9 is a diagram showing a state in which adhesive is supplied to the outer periphery of the spiral back yoke portion. [Figure 10] FIG. 10 is a diagram illustrating the lamination process. [Figure 11] FIG. 11 is a diagram illustrating the lamination process. [Figure 12] FIG. 12 is a schematic diagram illustrating a general configuration of an adhesive supplying device according to a modified example of the first embodiment. 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 to extend along the axis. The iron core pieces 4 have a plate-shaped back yoke portion 5 and a plurality of plate-shaped teeth portions 6.

[0017] As shown in Figures 1 to 3, the back yoke portion 5 is located on the outer periphery of the spiral core piece 4. The back yoke portion 5 extends spirally around the axis. The back yoke portion 5 has gaps 7 extending radially outward from the inner end face between the base ends of circumferentially adjacent teeth 6. The multiple teeth 6 extend radially inward from the inner end face of the back yoke portion 5.

[0018] 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.

[0019] The laminate 2 has an end face 2c on one side X1 in the stacking direction and an end face 2d on the other side X2 in the stacking direction. The end face 2c on the one side X1 in the stacking direction of the laminate 2 is formed by one longitudinal end of the spiral core piece 4. The end face 2d on the other side X2 in the stacking direction of the laminate 2 is formed by the other longitudinal end of the spiral core piece 4.

[0020] 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 spirally winding the core piece forming portion 82 in the thickness direction. For example, the one end of the core piece 4 is the winding start end. The other end of the core piece 4 is the winding end end. Below, an example will be described in which the end face 2c on one side X1 in the lamination direction of the laminate 2 is formed by the winding start end of the core piece 4, and the end face 2d on the other side X2 in the lamination direction of the laminate 2 is formed by the winding end of the core piece 4. Details of the manufacturing method of the core piece 4 will be described later.

[0021] 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.

[0022] 4, the adhesive portion 3 is located on the outer peripheral surface 2a of the laminate 2. The adhesive portion 3 is also located so as to overlap the outer peripheral portion 51 of the back yoke portion 5 in the stacking direction.

[0023] (Structure of adhesive joint) Next, the adhesive portion 3 of the laminated core 1 having the above-described configuration will be described in detail.

[0024] As shown in FIG. 4, the adhesive portion 3 includes an outer peripheral surface adhesive portion 31 and a back yoke adhesive portion 32. The outer peripheral surface adhesive portion 31 is located on the outer peripheral surface 2a of the laminate 2. The outer peripheral surface adhesive portion 31 extends in the stacking direction on the outer peripheral surface 2a of the laminate 2 from the end surface 2c on one side X1 of the laminate 2 in the stacking direction to the end surface 2d on the other side X2 of the stacking direction. The outer peripheral surface adhesive portion 31 connects the radially outer sides of the back yoke adhesive portions 32 in the stacking direction. Note that, for the sake of explanation, FIG. 4 shows overlapping regions of the core pieces 4 separated from each other in the stacking direction. However, in an actual laminated core 1, overlapping regions of the core pieces 4 in the stacking direction may be in contact with or close to each other.

[0025] The back yoke adhesive portion 32 is located on one side X1 in the stacking direction and on the other side X2 in the stacking direction with respect to the outer peripheral portion 51 of the back yoke portion 5. The outer peripheral portion 51 of the back yoke portion 5 refers to the portion that is radially inward of the outer peripheral end face 4a of the back yoke portion 5 and extends in the circumferential direction.

[0026] As shown in FIG. 3 , in this embodiment, the outer peripheral portion 51 of the back yoke portion 5 includes a portion where the radially outer end 71 of the slit 7 is located. Therefore, when the back yoke portion 5 is viewed in the thickness direction, the back yoke adhesive portion 32 overlaps the radially outer end 71 of the slit 7 in the stacking direction. Note that the outer peripheral portion does not have to include the portion where the radially outer end of the slit is located. In other words, the back yoke adhesive portion may overlap only the portion radially outward of the radially outer end of the slit in the stacking direction.

[0027] The back yoke adhesive portion may have a portion extending in the stacking direction within the gap defined by the cut, or a portion extending radially inward.

[0028] As described above, the back yoke portion 5 extends spirally around the axis. Therefore, the outer peripheral portion 51 also extends spirally around the axis. Therefore, the back yoke adhesive portion 32 extends spirally around the axis.

[0029] 4, in this embodiment, the back yoke bonding portion 32 is located on an end face 2c of the laminate 2 on one side X1 in the stacking direction and also on an end face 2d of the laminate 2 on the other side X2 in the stacking direction. The radially outer side of the portion of the back yoke bonding portion 32 located on the end face 2c of the one side X1 in the stacking direction is connected to the one side X1 in the stacking direction of the outer peripheral surface bonding portion 31. The radially outer side of the portion of the back yoke bonding portion 32 located on the end face 2d of the other side X2 in the stacking direction is connected to the other side X2 in the stacking direction of the outer peripheral surface bonding portion 31.

[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, the core pieces 4 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 a back yoke adhesive portion 32 that extends spirally about the axis and overlaps in the stacking direction with an outer periphery 51 of the spiral back yoke portion 5 located on the outer periphery of the lamination 2, and an outer periphery surface adhesive portion 31 that is located on the outer periphery 2a of the lamination 2 and connects the radially outer sides of the spiral back yoke adhesive portion 32 in the stacking direction.

[0031] In a laminated core 1 having a back yoke portion 5 and a plurality of tooth portions 6 extending radially inward from the back yoke portion 5, the inner peripheral side is easily fixed in its laminated state by the coils wound around the tooth portions 6, while the outer peripheral side is easily separated in the laminated direction.

[0032] In contrast, in the above-described laminated core 1, the outer periphery where the back yoke portion 5 is located is bonded in the lamination direction with an adhesive. This allows for a laminated core 1 with a bonded outer periphery to be obtained. This makes it possible to obtain a laminated core 1 with improved connection strength in the lamination direction.

[0033] (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 Figures 5 to 11. In this embodiment, the laminated core 1 is manufactured using a roll member T1 and a reservoir T2 in which adhesive is stored.

[0034] First, the roll member T1 and the storage portion T2 used in manufacturing the laminated core 1 will be briefly described with reference to Figures 5 and 6. The roll member T1 is cylindrical. The central axis Q of the roll member T1 extends horizontally. The roll member T1 rotates around the central axis Q. The core piece forming portion 82 is wound around the outer circumferential surface of the roll member T1.

[0035] The reservoir T2 supplies adhesive B to the outer periphery 51 of the back yoke portion 5 of the core piece 4 wound around the roll member T1.

[0036] Specifically, adhesive B is stored in storage section T2. ​​Storage section T2 is open on the top side. Storage section T2 is located below roll member T1. In this embodiment, storage section T2 does not move in the axial or radial direction of roll member T1 relative to roll member T1. More specifically, storage section T2 is located at adhesive application position P1 where the lower portion of outer circumferential portion 51 of back yoke section 5 of core piece 4 wound around roll member T1 is immersed in adhesive B. As a result, adhesive B is supplied to the portion of outer circumferential portion 51 of core piece 4 wound around the outer circumferential surface of roll member T1 that is located at adhesive application position P1.

[0037] Next, a description will be given of a method for manufacturing the laminated core 1 using the roll member T1 and the storage unit T2. The method for manufacturing the laminated core 1 includes a preparation step, a pressing step, a core piece forming step, a peripheral adhesive supplying step, and a lamination 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. 7 is an example of a punched-out diagram of the core piece forming portion 82 in the steel plate 80. In Fig. 7, 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. 7. 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. 8 is a diagram showing the schematic configuration of a punched core piece forming portion 82. As shown in Fig. 8, 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 teeth 6 in the back yoke forming portion 83. The slits 84 extend from the end of the back yoke forming portion 83 on one side in the width direction to the other side in the width direction.

[0044] In the core piece forming process, when viewed in the thickness direction of the core piece forming portion 82, the back yoke forming portion 83 is bent into an arc shape, thereby forming a spiral core piece 4 having a spirally extending back yoke portion 5 and a plurality of teeth portions 6 extending radially inward.

[0045] Specifically, in the core piece forming process, as shown in Fig. 5, the tip surfaces of the multiple teeth 6 of the core piece forming portion 82 in the protruding direction are brought into contact with the outer peripheral surface of a roll member T1 rotating about a central axis Q. The roll member T1 has a fixing portion that fixes the core piece forming portion 82 to the roll member in the circumferential direction. The fixing portion is not shown in the figure.

[0046] The fixing portion is, for example, a protrusion that protrudes radially outward. By rotating the roll member T1 with the protrusion disposed between the plurality of teeth 6, the core piece forming portion 82 is wound onto the outer peripheral surface of the roll member T1. Note that the fixing portion does not have to be a protrusion as long as it can fix the core piece forming portion to the roll member in the circumferential direction.

[0047] The core piece forming portion 82 is wound around the outer peripheral surface of the roll member T1, and is thereby formed into an arc shape when viewed in the thickness direction. As a result, the core piece forming portion 82 is formed into a spiral shape. That is, a spiral core piece 4 is formed, which has a back yoke portion 5 extending spirally and a plurality of teeth portions 6 extending radially inward.

[0048] At this time, the gap of the slit 84 formed in the back yoke forming portion 83 is closed. As a result, the cut 7 in the laminate 2 is formed.

[0049] In the outer periphery adhesive supplying step, adhesive is supplied to the outer periphery 51 of the back yoke portion 5 located on the outer periphery side of the spiral core piece 4.

[0050] In this embodiment, the outer periphery adhesive supplying step passes outer periphery 51 of back yoke part 5, which is bent into an arc, through reservoir T2 in which adhesive B is stored. In this embodiment, outer periphery 51 of back yoke part 5 includes a portion where radially outer end 71 of slit 7 is located. In other words, in the outer periphery adhesive supplying step, the range including radially outer end 71 of slit 7 on the outer periphery side of back yoke part 5 is passed through reservoir T2.

[0051] In detail, in the outer peripheral adhesive supply process, the portion of the outer peripheral portion 51 of the back yoke portion 5 that is positioned below when wrapped around the outer peripheral surface of the roll member T1 is continuously passed through a storage section T2 that is positioned at an adhesive application position P1 below the roll member T1.

[0052] 9, a spiral core piece 4 is formed that extends axially along the central axis P. In the core piece 4, adhesive B is supplied to one surface and the other surface in the thickness direction on the outer periphery side of the back yoke portion 5, as well as to an end face 4a on the outer periphery side. In other words, the core piece 4 is formed with adhesive B supplied to the outer periphery 51 of the back yoke portion 5.

[0053] In this embodiment, the adhesive B is supplied to a range including the radially outer end 71 of the slit 7. Therefore, in the outer periphery adhesive supplying step, the adhesive B may also permeate into the gap formed by the slit.

[0054] In the lamination process, the spiral core pieces 4 are stacked in the thickness direction. Specifically, the circumferential positions of the multiple tooth portions 6 are aligned in the lamination direction. With the circumferential positions of the multiple tooth portions 6 aligned in the lamination direction, the back yoke portion 5 and the multiple tooth portions 6 are stacked in the thickness direction, as shown in FIGS. 10 and 11. Note that the lamination process may be performed on the core pieces 4 in a state where they are wound around the roll member T1, as shown in FIGS. 10 and 11, or on the core pieces 4 in a state where the roll member T1 has been removed.

[0055] 11, a cylindrical laminate 2 extending along the axis is formed. Also, an outer peripheral surface adhesive portion 31 is formed on the outer peripheral surface 2a of the laminate 2, extending in the stacking direction from the position of the end surface 2c on one side X1 of the laminate 2 in the stacking direction to the position of the end surface 2d on the other side X2 of the stacking direction. Also, back yoke adhesive portions 32 are formed between regions of the back yoke portion 5 that overlap in the stacking direction, on the end surface 2c on one side X1 of the laminate 2 in the stacking direction, and on the outer peripheral portion 51 of the back yoke portion 5 on the end surface 2d on the other side X2 of the laminate 2 in the stacking direction.

[0056] The adhesive supplied to the outer peripheral surface and portion may spread radially inward between areas of the back yoke portion that overlap in the stacking direction when the spiral core segments are stacked in the thickness direction. Furthermore, when adhesive B is supplied into gaps defined by slits, the adhesive may spread radially inward within the gaps. This further improves the connection strength of the laminated core in the stacking direction.

[0057] Thereafter, the roll member T1 is removed from the core piece 4. Through the above steps, the laminated core 1 is manufactured.

[0058] 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 extending along the axis line by stacking, in the thickness direction, a plate-shaped back yoke portion 5 extending spirally around the axis line and a plurality of plate-shaped teeth portions 6 extending 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 peripheral adhesive supplying process, and a laminating process.

[0059] 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 to form a spiral core piece 4 having a back yoke portion 5 extending spirally and a plurality of teeth 6 extending radially inward. In the outer periphery adhesive supplying process, adhesive B is supplied to the outer periphery 51 of the back yoke portion 5 located on the outer periphery side of the spiral core piece 4. In the stacking process, the back yoke portion 5 and the plurality of teeth 6, whose outer peripheries 51 have been supplied with adhesive B, are stacked in the thickness direction to form a cylindrical laminate 2.

[0060] 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 its 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 can cause the core pieces 4 to expand in the radial direction. Therefore, generally, when connecting laminated cores having spiral back yoke portions in the lamination direction, it is necessary to fix the back yoke portion in both the lamination direction and the radial direction, which is not very easy to work with.

[0061] In contrast, in the above-described method, adhesive B is supplied to the outer periphery 51 of the spiral back yoke portion 5 before the core pieces 4 are stacked in the thickness direction. This allows the outer periphery of the core pieces 4 to be adhered in the stacking direction by stacking the core pieces 4 in the thickness direction. Therefore, it is possible to efficiently manufacture a laminated core 1 having a back yoke portion 5 that extends spirally around the axis.

[0062] Therefore, it is possible to provide a manufacturing method that can efficiently manufacture a laminated core 1 having a back yoke portion 5 that extends spirally around an axis.

[0063] In addition, in the outer peripheral adhesive supply process of this embodiment, adhesive B is supplied to the outer peripheral portion 51 by passing the outer peripheral portion 51 of the back yoke portion 5, which is bent into an arc shape, through a storage section T2 in which adhesive B is stored.

[0064] This allows the adhesive B to be easily supplied to the outer peripheral portion 51 of the back yoke portion 5. Therefore, the manufacturing efficiency of the laminated core 1 can be improved.

[0065] Furthermore, in the core piece forming process of this embodiment, core piece forming portion 82 is wound around the outer peripheral surface of roll member T1, which rotates about an axis extending horizontally, thereby bending back yoke forming portion 83 into an arc. In the outer peripheral portion adhesive supplying process, adhesive B is supplied to outer peripheral portion 51 by continuously passing the portion of outer peripheral portion 51 of back yoke portion 5 that is positioned below when wound around the outer peripheral surface of roll member T1 through reservoir T2 that is positioned below roll member T1.

[0066] This allows the adhesive B to be efficiently supplied to the outer peripheral portion 51 of the back yoke portion 5. Therefore, the manufacturing efficiency of the laminated core 1 can be improved.

[0067] Furthermore, in the laminated core 1 manufactured by the above-described manufacturing method, the outer peripheral surface adhesive portion 31 extends in the stacking direction on the outer peripheral surface 2a of the laminate 2 from the position of the end face 2c on one side X1 of the laminate 2 in the stacking direction to the position of the end face 2d on the other side X2 of the laminate 2 in the stacking direction. The back yoke adhesive portion 32 is located on the outer peripheral portion 51 of the back yoke portion 5 between regions of the back yoke portion 5 that overlap in the stacking direction, on the end face 2c on one side X1 of the laminate 2 in the stacking direction, and on the end face 2d on the other side X2 of the laminate 2 in the stacking direction.

[0068] In the laminated core 1 configured as described above, the adhesive portions 3 are located on the outer peripheral end surface 4a of the spiral-shaped back yoke portion 5 and on portions along the outer peripheral end surfaces 4a on both thickness-wise surfaces of the back yoke portion 5. Such a laminated core 1 can be obtained by immersing the outer peripheral portion 51 of the back yoke portion 5 in adhesive B along the longitudinal direction of the back yoke portion 5 before stacking the spiral-shaped core pieces 4 in the stacking direction. In other words, the laminated core 1 is efficiently manufactured by a manufacturing method in which adhesive B is supplied to the outer peripheral portion 51 of the back yoke portion 5 while winding the core pieces 4 spirally. Therefore, a laminated core 1 with improved connection strength in the stacking direction can be obtained, manufactured by a manufacturing method with improved manufacturing efficiency.

[0069] 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 enabling a motor manufactured using a manufacturing method with improved manufacturing efficiency to be obtained.

[0070] (Modification of the first embodiment) In the outer periphery adhesive supplying process of embodiment 1, adhesive B stored in reservoir T2 is supplied to outer periphery 51 of back yoke section 5. Therefore, the amount of adhesive B stored in reservoir T2 gradually decreases. In other words, the liquid level in reservoir T2 gradually decreases. Therefore, for example, the radial range of back yoke section 5 to which adhesive B is supplied gradually narrows in the radial direction.

[0071] In contrast to this, in the outer periphery adhesive supplying step of this modified example, as shown in FIG. 12, adhesive B is supplied to reservoir T2 by adhesive supply device T3.

[0072] The adhesive supply device T3 supplies, for example, the same amount of adhesive B as that supplied to the outer periphery 51 of the back yoke section 5 to the storage section T2. ​​This allows the amount of adhesive B stored in the storage section T2 to be kept constant. Therefore, the liquid level in the storage section T2 can be kept constant. Therefore, the radial range over which adhesive B is supplied to the outer periphery 51 can be kept constant throughout the entire longitudinal direction of the back yoke section 5.

[0073] The adhesive supply device T3 has, for example, a tank T31, a supply unit T32, and a pipe T33. The tank T31 contains adhesive B. The supply unit T32 sends the adhesive B contained in the tank T31 to the storage unit T2. The supply unit T32 is, for example, a pump. The pipe T33 forms a flow path for the adhesive B. The pipe T33 is arranged between the tank T31 and the supply unit T32 and between the supply unit T32 and the storage unit T2.

[0074] This allows for a configuration in which the adhesive B can be efficiently replenished into the reservoir T2.

[0075] The adhesive supply device T3 may also have a detection unit that detects when the adhesive B stored in the storage unit T2 has decreased. The detection unit may, for example, detect the liquid level, the weight of the adhesive stored in the storage unit, or the pressure when the supply unit dispenses the adhesive. In this case, the supply unit may dispense the adhesive stored in the tank to the storage unit based on the detection result of the detection unit.

[0076] That is, in the outer periphery adhesive supplying step of the manufacturing method of the laminated core 1 according to this modified example, adhesive B is supplied to the reservoir T2 by the adhesive supplying device T3.

[0077] This allows the amount of adhesive B stored in the storage section T2 to be efficiently kept constant.

[0078] Furthermore, the area of ​​the outer peripheral portion 51 of the back yoke portion 5 that is immersed in the reservoir T2 can be made uniform. This makes it possible to make the radial range over which adhesive B is supplied to the outer peripheral portion 51 uniform across the entire longitudinal direction of the back yoke portion 5. This makes it possible to align the range over which adhesive B is supplied in the stacking direction when the core pieces 4 are stacked in the stacking direction. This makes it possible to suppress variations in the connection strength of the laminated core 1.

[0079] (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.

[0080] In the above embodiment, 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.

[0081] In the manufacturing method of the above embodiment, the reservoir T2 is disposed below the roll member T1. However, the reservoir may be movable, for example, upward, as the roll member rotates. This allows the radial range of adhesive B supplied to the back yoke section to be constant. This configuration also allows the radial range over which adhesive B is supplied to the outer periphery of the back yoke section to be constant throughout the entire longitudinal direction of the back yoke section. This reduces variations in the connection strength of the laminated core.

[0082] In the outer periphery adhesive supplying process of the above embodiment, adhesive B is supplied to the outer periphery 51 over the entire longitudinal direction of the back yoke section 5. However, in the outer periphery adhesive supplying process, adhesive may be supplied to only a portion of the outer periphery of the back yoke section in the longitudinal direction. For example, in the outer periphery adhesive supplying process, adhesive is not supplied to a portion of the back yoke section that forms an end face on one side in the stacking direction of the laminate and a portion that forms an end face on the other side in the stacking direction of the laminate. This makes it possible to obtain a laminated core in which adhesive portions are not located on the end faces on one side and the other side in the stacking direction of the laminate.

[0083] (Configuration example) The present technology can also be configured as follows.

[0084] (1) A method for manufacturing a laminated core is 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 extending radially inward from the back yoke portion are stacked in the thickness direction. The method for manufacturing the laminated core includes a press process for punching out from a steel plate a plate-shaped core piece forming portion having a strip-shaped back yoke forming portion and 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 for bending the back yoke forming portion into an arc shape to form a spiral core piece having the back yoke portion extending spirally and the plurality of teeth extending radially inward, an outer periphery adhesive supplying process for supplying adhesive to an outer periphery of the back yoke portion located on the outer periphery of the spiral core piece, and a stacking process for stacking the back yoke portion and the plurality of teeth with adhesive supplied to their outer peripheries in the thickness direction.

[0085] (2) In the laminated core manufacturing method described in (1), in the outer periphery adhesive supplying process, adhesive is supplied to the outer periphery by passing the outer periphery of the back yoke part bent into an arc shape through a storage section in which adhesive is stored.

[0086] (3) In the laminated core manufacturing method described in (2), in the core piece forming step, the core piece forming portion is wound around the outer circumferential surface of a roll member that rotates about an axis extending horizontally, thereby bending the back yoke forming portion into an arc. In the outer circumferential portion adhesive supply step, adhesive is supplied to the outer circumferential portion by continuously passing a portion of the outer circumferential portion of the back yoke portion that is positioned below when wound around the outer circumferential surface of the roll member through the reservoir that is positioned below the roll member.

[0087] (4) In the laminated core manufacturing method described in (3), in the outer periphery adhesive supplying step, adhesive is supplied to the reservoir by an adhesive supplying device.

[0088] (5) The laminated core has a cylindrical laminate extending along the axis, in which core pieces are stacked in the thickness direction, each core piece 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 an adhesive portion that bonds the laminate in the stacking direction. The adhesive portion includes a back yoke adhesive portion that extends spirally around the axis and overlaps in the stacking direction with an outer periphery of the spiral back yoke portion located on the outer periphery of the laminate, and an outer periphery surface adhesive portion that is located on the outer periphery of the laminate and connects the radially outer sides of the spiral back yoke adhesive portion in the stacking direction.

[0089] (6) In the laminated core described in (5), the outer peripheral surface adhesive portion extends in the stacking direction on the outer peripheral surface of the laminate from an end face position on one side of the laminate in the stacking direction to an end face position on the other side of the laminate in the stacking direction. The back yoke adhesive portion is located between overlapping regions of the back yoke portion in the stacking direction, on the end face on one side of the laminate in the stacking direction, and on the outer peripheral portion of the back yoke portion on the end face on the other side of the laminate in the stacking direction.

[0090] (7) A motor includes a stator having the laminated core described in (5) or (6), and a rotor positioned radially relative to the stator and rotating about the axis of the laminated core. [Industrial Applicability]

[0091] 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]

[0092] 1 Laminated core 2. Laminate 2a Outer surface of laminate 2b Inner surface of laminate 2c End face of one side of the laminate in the stacking direction 2d End face on the other side of the laminate in the stacking direction 3 Adhesive part 31 Outer surface adhesive part 32 Back yoke adhesive part 4 Core pieces 4a: End face on the outer periphery of the core piece, end face on the outer periphery of the back yoke 4b Radial inner end face of core piece 5 Back yoke 51 Outer periphery 6 Teeth 7. Cut 71 radial outer end 80 steel plate 82 Core piece forming section 83 Back yoke forming part 84 Slit B. Adhesive T1 Rolled material T2 reservoir T3 Adhesive Supply Unit T31 Tank T32 supply section T33 tube X1 One side of stacking direction X2 Other side in stacking direction P Central axis of laminated core Q Central axis of roll member P1 Adhesive application position

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 peripheral adhesive supplying step of supplying adhesive to the peripheral portion of the back yoke portion located on the outer peripheral side of the spiral core piece; a lamination step of stacking the back yoke portion and the plurality of teeth portions, each having an outer periphery coated with adhesive, in a thickness direction to form a cylindrical laminate; having Laminated core manufacturing method.

2. 2. The laminated core manufacturing method according to claim 1, In the outer periphery adhesive supply process, The adhesive is supplied to the outer periphery of the back yoke portion bent into an arc shape by passing the outer periphery of the back yoke portion through a reservoir in which the adhesive is stored. Laminated core manufacturing method.

3. 3. The laminated core manufacturing method according to claim 2, In the core piece forming process, the back yoke forming portion is bent into an arc shape by winding the core piece forming portion onto an outer peripheral surface of a roll member that rotates about an axis extending in a horizontal direction; In the outer periphery adhesive supplying step, a portion of the outer periphery of the back yoke portion that is positioned below the outer periphery of the roll member when the back yoke portion is wound around the outer periphery of the roll member is continuously passed through the reservoir that is positioned below the roll member, thereby supplying the adhesive to the outer periphery. Laminated core manufacturing method.

4. 4. The laminated core manufacturing method according to claim 3, In the outer periphery adhesive supplying step, supplying adhesive to the reservoir by an adhesive supply device; 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 a back yoke adhesive portion that extends spirally around an axis and overlaps in the stacking direction with an outer periphery of the spiral back yoke portion that is located on the outer periphery of the laminate; an outer peripheral surface adhesive portion located on the outer peripheral surface of the laminate and connecting radially outer sides of the spiral back yoke adhesive portion in the stacking direction; Including, Laminated iron core.

6. The laminated core according to claim 5, The outer peripheral surface adhesive portion is extending in the stacking direction on the outer peripheral surface of the laminate from an end face position on one side of the laminate in the stacking direction to an end face position on the other side of the laminate in the stacking direction, The back yoke adhesive portion is located between regions of the back yoke portion that overlap in the stacking direction, on an end face of the laminate on one side in the stacking direction, and on an outer periphery of the back yoke portion on an end face of the laminate on the other side in the stacking direction, Laminated iron core.

7. a stator having the laminated core according to claim 5 or 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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