Method for manufacturing laminated iron core

Abstract

A method for manufacturing a laminated iron core according to one aspect of the present disclosure comprises: a forming step of punching a metal plate (MS) along a predetermined shape to form a plurality of blocks (B); and a stacking step in which the plurality of blocks (B) are stacked on a welding jig (70) having a positioning member (80A) and a positioning member (80B) disposed at different positions in the circumferential direction around the predetermined axis (Ax). The positioning member (80A) restricts the position of the teeth (4) of each of the plurality of blocks (B) in the circumferential direction. The positioning member (80B) restricts the position of the other tooth portion (4) of each of the plurality of blocks (B) in the circumferential direction. In the stacking step, a plurality of blocks (B) are stacked on a welding jig (70) so that gaps (ga, gb) are provided between one tooth section (4) and a positioning member (80A) and between the other tooth section (4) and a positioning member (80B).

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a laminated core. Background Art

[0002] Patent document 1 discloses a method for manufacturing a stator core. The method includes a stacking step in which a plurality of plates are stacked axially on a positioning fixture and positioned, wherein the positioning fixture has a radial positioning portion for positioning the radial position of an annular portion of the plate and a circumferential positioning portion for positioning the circumferential position of a tooth portion of the plate.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-249485 Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The present disclosure provides a method for manufacturing a laminated core, which is useful for reducing lamination deviation.

[0008] (II) Technical solution

[0009] The manufacturing method of a laminated core according to one aspect of the present disclosure includes: a forming step of punching a metal plate along a predetermined shape to form a plurality of core components; and a stacking step of stacking a plurality of core components on a fixture having a first positioning portion and a second positioning portion arranged at different positions in a circumferential direction around a predetermined axis. The first positioning portion limits the position of the first part of each of the plurality of core components in the circumferential direction. The second positioning portion limits the position of the second part of each of the plurality of core components in the circumferential direction. In the stacking step, the plurality of core components are stacked on the fixture in a manner such that a gap is provided between the first part and the first positioning portion and between the second part and the second positioning portion.

[0010] (III) Beneficial effects

[0011] According to the present disclosure, there is provided a method for manufacturing a laminated core which is useful for reducing lamination deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view showing an example of a laminated core.

[0013] Figure 2A It is composed Figure 1 An exploded perspective view of a laminated body of a laminated core shown.

[0014] Figure 2BIt is a schematic diagram showing an example of a cross section of a laminated body.

[0015] Figure 3 It is a schematic diagram showing an example of a manufacturing apparatus for a laminated iron core.

[0016] Figure 4A It is a perspective view schematically showing an example of a clamp.

[0017] Figure 4B It is a perspective view schematically showing an example of a state in which a laminated body is formed on a jig.

[0018] Figure 5 It is a plan view schematically showing an example of a state in which a laminated body is formed on a jig.

[0019] Fig. 6A It is a side view schematically showing an example of the positional relationship between a pair of teeth and a positioning member.

[0020] Figure 6B It is a side view schematically showing an example of the positional relationship between a pair of teeth and a positioning member.

[0021] Fig. 7A It is a plan view schematically showing an example of a positioning member in a state where a laminated body is formed on a jig.

[0022] Figure 7B This is a side view schematically showing an example of a state in which a stacked body is pressurized.

[0023] Fig. 8A It is a schematic diagram showing an example of a state where a laminated body is formed on a jig.

[0024] Figure 8B It is a schematic diagram showing an example of a state where a laminated body is formed on a jig.

[0025] Fig.9A It is a schematic diagram showing an example of a state where a laminated body is formed on a jig.

[0026] Fig. 9B It is a schematic diagram showing an example of a state where a laminated body is formed on a jig. DETAILED DESCRIPTION

[0027] An embodiment is described below with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same functions, and repeated descriptions are omitted. In addition, in this specification, when referring to the top, bottom, right, and left of a figure, the orientation of the symbols in the figure is used as a reference.

[0028] [Laminated core]

[0029] First, refer to Figure 1 , Figure 2A and Figure 2B , a laminated core 1 of an embodiment will be described. The laminated core 1 is a laminated core for a motor or an intermediate product during its manufacturing process. As Figure 1 shown, the laminated core 1 is, for example, a core for a stator of a motor (stator laminated core). The stator of the motor is formed by installing a winding on the laminated core 1 shown in Figure 1 . By combining the stator and the rotor, a motor (electric motor) is formed. Hereinafter, the case where the laminated core 1 is a stator laminated core will be described as an example.

[0030] The laminated core 1 as a whole is cylindrical. In the central portion of the laminated core 1, a through-hole 1a extending along the central axis of the laminated core 1 is formed. The through-hole 1a extends in the height direction of the laminated core 1. A rotor can be disposed in the through-hole 1a. The laminated core 1 and the core for the rotor together constitute a motor. The laminated core 1 includes, for example, a laminate 1A and a weld bead 9.

[0031] The laminate 1A is formed by laminating (stacking) a plurality of blocks B. In the laminate 1A shown in Figure 2A , five blocks B are laminated. The lamination direction of the laminate 1A is also the height direction of the laminate 1A and also the extending direction of the central axis of the laminate 1A. The central axis of the laminate 1A corresponds to the central axis of the laminated core 1. Hereinafter, the lamination direction of the laminate 1A will be simply referred to as the "lamination direction".

[0032] The block B (core component) is formed by laminating a plurality of blanking components W. The block B is a laminate formed by laminating a plurality of blanking components W. The blanking component W is a plate-like body formed by blanking a metal plate MS (for example, an electromagnetic steel sheet) described later along a predetermined shape. The blanking component W has a shape corresponding to the laminate 1A (block B). A plurality of blocks B can also form the laminate 1A by so-called rotational lamination (Japanese: 転積).

[0033] "Rotational stacking" means that when a plurality of blocks B are stacked to obtain a stack 1A, the angles of the plurality of blocks B are relatively offset from each other, including the case where the blocks B are rotated while being stacked. The main purpose of rotational stacking is to reduce the thickness deviation between the plurality of punched parts W constituting the stack 1A. The plurality of blocks B are stacked while being relatively offset according to the angles of the plurality of blocks B (the positions of the respective reference positions of the plurality of blocks B in the circumferential direction). The plurality of blocks B can be stacked in sequence in the following manner, that is, the reference positions of the adjacent blocks B in the stack 1A differ by a certain angle. The above-mentioned certain angle may be 360° / N (N is a natural number greater than 2). N may also be a natural number greater than 3. In one example, the above-mentioned certain angle is 120°, 90° or 72°. The above-mentioned certain angle may also be 180° (N may be 2).

[0034] The multiple blocks B each include a yoke 2 and multiple teeth 4. The yoke 2 is a portion formed in an annular shape. The yoke 2 may be in the shape of a circular ring. The multiple teeth 4 are portions that intersect and extend with the yoke 2. The multiple teeth 4 extend inward from the inner edge of the yoke 2, respectively. The multiple teeth 4 protrude from the inner edge of the yoke 2 toward the central axis of the stack 1A, respectively. The multiple teeth 4 may be arranged at approximately equal intervals in the circumferential direction of the yoke 2 (the extension direction of the yoke 2). In the circumferential direction of the yoke 2, spaces (slots) for configuring windings are formed between adjacent teeth 4.

[0035] In the block B, a plurality of blanking parts W can be connected to each other by riveting. Figure 2B As shown, the plurality of punching parts W constituting the block B include: a plurality of punching parts WT stacked on each other, and a punching part WB further stacked on the plurality of punching parts WT. The punching part WB is located at the outermost layer of the block B (e.g. Figure 2B the lowest layer shown).

[0036] The punching part WT may have a rivet portion 6. The rivet portion 6 includes: a recessed portion 6a formed on the main surface Wa of the punching part WT, and a convex portion 6b formed on the main surface Wb of the punching part WT. The punching parts WT are stacked in a manner that the main surface Wa and the main surface Wb are opposite to each other. At the boundary between the punching parts WT adjacent to each other, the convex portion 6b of one punching part WT is engaged with the recessed portion 6a of another punching part WT. Thus, the punching parts WT are connected to each other. The punching part WB is different from the punching part WT in that a through hole 7 is formed instead of the rivet portion 6. The punching part WB is stacked in a manner that is opposite to the main surface Wb of the punching part WT on which the convex portion 6b is formed. At the boundary between the punching part WT and the punching part WB, the convex portion 6b of the punching part WT is engaged with the through hole 7 of the main surface Wb. Thus, the punching part WT is connected to the punching part WB.

[0037] like Figure 1 As shown, the weld bead 9 is formed on the outer surface of the laminate 1A. The weld bead 9 is formed by welding a plurality of blocks B to each other after laminating the plurality of blocks B to form the laminate 1A. The weld bead 9 can extend linearly as a whole in the lamination direction of the laminate 1A, from one end surface (e.g., the upper end surface) to the other end surface (e.g., the lower end surface) of the laminate 1A. Different from Figure 1 the example shown, the weld bead 9 can also be locally formed near the boundary between adjacent blocks B. By welding, that is, the welding for forming the weld bead 9, a plurality of blocks B arranged in the lamination direction are fixed to each other.

[0038] [Manufacturing Apparatus for Laminated Core]

[0039] Next, with reference to Figure 3 , the manufacturing apparatus 10 (manufacturing apparatus for laminated core) for manufacturing the laminated core 1 will be described. The manufacturing apparatus 10 is configured to manufacture the laminated core 1 from a strip-shaped metal plate MS. The manufacturing apparatus 10 includes: an uncoiler 20, a feeding device 30, a stamping device 40, a conveyor 50, a welding device 60, and a controller 100.

[0040] The uncoiler 20 is configured to rotatably hold the coil 22. The coil 22 is formed by winding the metal plate MS into a coil shape (spiral shape). The feeding device 30 includes a pair of rollers 32, 34 that sandwich the metal plate MS from above and below. The pair of rollers 32, 34 are configured to rotate and stop based on an operation instruction from the controller 100, and intermittently feed the metal plate MS toward the stamping device 40.

[0041] The stamping device 40 is configured to operate based on an operation instruction from the controller 100, and punch the metal plate MS along a predetermined shape to form a plurality of punched parts W. The stamping device 40 is configured, for example, to sequentially perform blanking or notch bending (in Japanese: 切り曲げ加工) on the metal plate MS fed by the feeding device 30 by a plurality of punches, to form a plurality of punched parts W. The stamping device 40 can be configured to sequentially stack the plurality of punched parts W obtained by blanking to form a block B. The conveyor 50 conveys the block B formed by the stamping device 40 toward the welding device 60. It can also be different from Figure 3 the example shown, and the block B is manually transported to the welding device 60 instead of the conveyor 50.

[0042] The welding device 60 is configured to operate based on an operation instruction from the controller 100, and perform a welding operation on the laminate 1A formed by laminating a plurality of blocks B. In Figure 3In the manufacturing apparatus 10 shown, the laminated core 1 is manufactured by welding the laminated body 1A after forming the laminated body 1A in the welding apparatus 60. The welding apparatus 60 will be described in detail later.

[0043] The controller 100 is a computer that controls each device included in the manufacturing device 10. The controller 100 is configured to generate signals for operating the feeding device 30, the punching device 40, the conveyor 50, and the welding device 60 by, for example, executing a program recorded in a recording medium or based on an operation input from an operator. The controller 100 is configured to send the above-mentioned signals to the feeding device 30, the punching device 40, the conveyor 50, and the welding device 60, respectively.

[0044] (Welding equipment)

[0045] Next, refer to Figures 4A to 6B The welding device 60 is described. The welding device 60 includes, for example, a welding jig 70 and a welding machine 76. The welding jig 70 (jig) is a jig for stacking a plurality of blocks B to form a stacked body 1A. The welding jig 70 is formed so that a plurality of blocks B can be stacked on the welding jig 70. The welding jig 70 has a function of positioning each block B when stacking a plurality of blocks B. The welding jig 70 has a function of positioning each block B in the circumferential direction around the central axis of the block B. The welding jig 70 may also have a function of positioning each block B in the radial direction of a circle centered on the central axis of the block B. By positioning a plurality of blocks B in one direction, the difference in position (stacking offset) between the plurality of blocks B in that direction can be reduced.

[0046] The welding jig 70 includes, for example, a lower plate 72, a diameter expansion member 74, and a plurality of positioning members 80. Figure 4A As shown in FIG. 1 , the lower plate 72 is a plate-shaped member. The lower plate 72 is configured to support a plurality of blocks B (stacked body 1A) placed on the upper surface of the plate. Figure 4A As shown in the example, it is a quadrilateral when viewed from above, and can also be Figure 4A The example shown is different and has other shapes such as a circle. The upper surface of the lower plate 72 is larger than the area within the outer edge of the punched part W constituting the block B.

[0047] The diameter expansion member 74 has the following function: when forming the stacked body 1A on the welding jig 70, the plurality of blocks B are positioned in the radial direction. The diameter expansion member 74 is provided on the upper surface of the lower plate 72 (for example, approximately in the center of the upper surface in a plan view). Figure 4AAs shown, the diameter expansion component 74 can be formed into a cylindrical shape. The diameter expansion component 74 includes a plurality of expansion and contraction parts 74a obtained by dividing a cylinder. Each expansion and contraction part 74a is formed to be fan-shaped when viewed from above. The expansion and contraction part 74a can be set to be able to move radially along a circle centered on a predetermined axis Ax. The axis Ax can be roughly consistent with the center of the circle of the diameter expansion component 74 when viewed from above. The vertices (centers of the arcs) of the plurality of fan-shaped expansion and contraction parts 74a can overlap with the axis Ax. The axis Ax is an imaginary axis perpendicular to the upper surface of the lower side plate 72.

[0048] The plurality of positioning components 80 have the following function: when a plurality of blocks B are stacked on the welding jig 70, the plurality of blocks B are positioned in the circumferential direction around the axis Ax. The plurality of positioning components 80 are provided on the lower plate 72. The plurality of positioning components 80 are arranged around the axis Ax (the diameter expansion component 74). The plurality of positioning components 80 are arranged at different positions in the circumferential direction around the axis Ax (the circumferential direction of the circle around the axis Ax).

[0049] A plurality of positioning components 80 can be arranged on a circumference with the axis Ax as the center. In this case, the plurality of positioning components 80 can be arranged at arbitrary intervals on the circumference, for example, they can be arranged at approximately equal intervals from each other. The plurality of positioning components 80 can be arranged at positions with different distances from the axis Ax. On the welding fixture 70, a plurality of blocks B are stacked in such a manner that the axis Ax is approximately consistent with the central axis of the block B. When the plurality of blocks B are stacked on the welding fixture 70, the circumferential direction around the axis Ax is approximately consistent with the circumferential direction around the central axis of the block B, and these circumferential directions are referred to as "circumferential directions" below. In addition, the radial direction of the circle with the axis Ax as the center and the radial direction of the circle with the central axis of the block B as the center (the direction in which the tooth portion 4 extends) are referred to as "radial directions".

[0050] The welding jig 70 may also have three or more, four or more, or six or more positioning members 80. The plurality of positioning members 80 may be formed in a cylindrical shape so as to extend along the axis Ax. The plurality of positioning members 80 may be located between any pair of teeth 4 (a pair of teeth 4 adjacent to each other) included in the block B when the block B is placed on the lower plate 72. Figure 4B As shown, the diameter expansion member 74 is inserted into the through hole of each block B corresponding to the through hole 1a, and the block B is stacked on the welding jig 70 in such a manner that the positioning member 80 is inserted between the pair of teeth 4. When the plurality of blocks B are stacked on the welding jig 70, the plurality of positioning members 80 respectively restrict the position of the corresponding pair of teeth 4 (the pair of teeth 4 sandwiched by the positioning member 80) in the circumferential direction.

[0051] Figure 51 is a top view showing the positional relationship between a block B and a plurality of positioning members 80 when a plurality of blocks B are stacked on a welding jig 70. The plurality of positioning members 80 are respectively configured so that a gap is formed between the positioning member 80 and a corresponding pair of teeth 4 when the plurality of blocks B are stacked on the welding jig 70. In addition, there is also a case where, in a pair of teeth 4 of a part of a block B, any one of the pair of teeth 4 is in contact with the positioning member 80.

[0052] Here, one arbitrarily selected from the plurality of positioning components 80 is marked as “positioning component 80A”, and another one different from the positioning component 80A is marked as “positioning component 80B”. That is, the plurality of positioning components 80 include a positioning component 80A (first positioning portion) and a positioning component 80B (second positioning portion). The positioning component 80A limits the circumferential position of a pair of mutually adjacent teeth 4 (first portion) among the plurality of teeth 4 of each of the plurality of blocks B. The positioning component 80B limits the circumferential position of another pair of mutually adjacent teeth 4 (second portion) among the plurality of teeth 4 of each of the plurality of blocks B. When the plurality of blocks B are stacked on the welding jig 70, a gap is formed between the positioning component 80A and the corresponding pair of teeth 4 (a pair of first teeth) and between the positioning component 80B and the corresponding pair of teeth 4 (a pair of second teeth).

[0053] The plurality of positioning members 80 are each formed to a size such that a gap is provided between the corresponding pair of teeth 4. A gap is formed between the positioning member 80 and the corresponding pair of teeth 4, but if the angle of the block B around the axis Ax is not consistent with a range, the positioning member 80 will not be inserted between the corresponding pair of teeth 4 during stacking. That is, if the angle of the block B around the axis Ax is not within a range, the positioning member 80 interferes with a tooth 4 during stacking, and the block B cannot be stacked on the welding jig 70. Therefore, the plurality of positioning members 80 respectively define the circumferential position of the block B on the welding jig 70. The plurality of positioning members 80 are each configured so that a gap is also formed between the positioning member 80 and a portion of the inner circumferential surface of the yoke 2 located between the corresponding pair of teeth 4.

[0054] exist Fig. 6A FIG. 8 shows a situation where the positioning member 80A and the corresponding pair of teeth 4 are viewed from the axis Ax toward the outside (from Figure 5 A side view of the case where the arrow "V1" is observed. Figure 6B FIG. 8 shows a situation where the positioning member 80B and the corresponding pair of teeth 4 are viewed from the axis Ax toward the outside (from Figure 5 The side view of the arrow "V2" below. Fig. 6A and Figure 6B An example is shown in which three blocks B are stacked.

[0055] In the case of focusing on one positioning component 80, namely, the positioning component 80A, the circumferential positions of a pair of teeth 4 restricted by the positioning component 80A are different between the multiple blocks B. One of the main reasons for this positional offset is the individual differences in the formation positions of the teeth 4. In addition, when viewed from above, the inner edge or outer edge of the yoke 2 (an imaginary circle defined by the inner circumferential surfaces of the multiple teeth 4) is not a perfect circle due to manufacturing errors, etc., but an elliptical shape close to a perfect circle. Therefore, if the above-mentioned rotational stacking is performed, positional offsets may occur between the stacked teeth 4. In addition, if each block B is placed on the welding fixture 70 in a manner such that the positioning component 80 is inserted between the corresponding pair of teeth 4, positional offsets (stacking offsets) may occur between the corresponding teeth 4 when focusing on one positioning component 80.

[0056] Here, the gap between one positioning member 80 and one of the corresponding pair of teeth 4 is marked as "ga", and the gap between the positioning member 80 and the other of the corresponding pair of teeth 4 is marked as "gb". The size of the gap between the positioning member 80 and the corresponding pair of teeth 4 can be expressed by the sum of the size of the gap ga and the size of the gap gb. The size of the gap ga is defined by the shortest distance between the positioning member 80 and one tooth 4. The size of the gap gb is defined by the shortest distance between the positioning member 80 and the other tooth 4.

[0057] When focusing on the positioning member 80A, the sum of the size of the gap ga and the size of the gap gb in one block B may be substantially consistent with the sum of the size of the gap ga and the size of the gap gb in another block B. In other words, the size of the gap between the positioning member 80A and the corresponding pair of teeth 4 of one block B may be substantially consistent with the size of the gap between the positioning member 80A and the corresponding pair of teeth 4 of another block B. Among all the blocks B, the size of the gap between the positioning member 80A and the corresponding pair of teeth 4 may be substantially consistent.

[0058] The size of the gap between the positioning component 80A and the corresponding pair of teeth 4 may be substantially consistent with the size of the gap between the other positioning component 80, namely the positioning component 80B, and the pair of teeth 4 corresponding to the positioning component 80B. In this case, the sum of the size of the gap ga at the positioning component 80A and the size of the gap gb may be substantially consistent with the sum of the size of the gap ga and the size of the gap gb at the other positioning component 80. In the present disclosure, the size of each gap (or the sum of the size of the gap) being substantially consistent with each other means that the size (sum) of one gap is 0.95 to 1.05 times the size (sum) of another gap.

[0059] One of the plurality of positioning components 80, namely the positioning component 80A, can be set at a position asymmetric with respect to the axis Ax with respect to the other positioning component 80B. An asymmetric position refers to a position where, when viewed from above, one component does not overlap with an imaginary straight line connecting the other component and the axis Ax. The positioning component 80A and the positioning component 80B can be arranged at positions that are separated from each other by an angle different from 180° (for example, an angle less than 175°) in the circumferential direction around the axis Ax. By arranging at least two positioning components 80 at asymmetric positions, the radial movement of the block B through the positioning component 80A is not restricted in the positioning component 80A, and the radial movement of the block B can be restricted by the positioning component 80B. In addition, the radial movement of the block B through the positioning component 80B is not restricted in the positioning component 80B, and the radial movement of the block B can be restricted by the positioning component 80A.

[0060] return Figure 4A The welding machine 76 of the welding device 60 welds the predetermined welding position of the stacked body 1A formed by stacking a plurality of blocks B on the welding fixture 70, so that the plurality of blocks B are fixed to each other. The welding machine 76 can perform welding by any welding method. As an example of the welding method, an arc welding method can be cited. As the arc welding method, it can be a melting electrode method in which an electrode is melted and used as a filler metal, or it can be a non-melting electrode method in which a non-consumable electrode is used and a filler metal is added separately. As an example of the non-melting electrode method, TIG welding can be cited.

[0061] The welding machine 76 can perform welding in a state where the stacked body 1A formed on the welding jig 70 is pressurized in the stacking direction. The welding jig 70 may include an upper plate placed above the stacked body 1A and a driving unit that drives the upper plate to approach or separate from the lower plate 72. The driving unit may move the upper plate to approach the lower plate 72, thereby pressurizing the stacked body 1A in the stacking direction.

[0062] [Method for manufacturing laminated core]

[0063] Next, refer to Figure 3~Figure 5 , a method for manufacturing the laminated core 1 is described. First, a process (forming process) of punching a metal plate MS along a predetermined shape to form a plurality of blocks B is performed. Figure 3 As shown, based on an operation instruction from the controller 100 , the press working device 40 sequentially punches out the metal sheet MS and stacks a plurality of punched parts W to form a block B. The block B discharged from the press working device 40 is conveyed to the welding device 60 alone or together with other blocks B by the conveyor 50 .

[0064] Next, a step of stacking a plurality of blocks B on the welding jig 70 (stacking step) is performed (see Figure 4A and Figure 4B In the stacking process, the plurality of blocks B may be stacked on the welding jig 70 while the reference positions of the plurality of blocks B are relatively staggered in the circumferential direction. The stacking of the plurality of blocks B on the welding jig 70 (the arrangement of the plurality of blocks B on the welding jig 70) may be performed by a robot or other device, or may be performed manually.

[0065] In the process of stacking a plurality of blocks B, initially, the first block B is set on the welding jig 70. The first block B is set on the welding jig 70 in such a manner that a plurality of positioning components 80 are respectively inserted between a corresponding pair of teeth 4 in a state where one main surface is opposite to the upper surface of the lower side plate 72. Thereafter, the second block B is overlapped on the first block B on the welding jig 70 in such a manner that the position of the reference position of the second block B in the circumferential direction differs by a predetermined angle relative to the position (angle) of the reference position of the first block B in the circumferential direction. The second block B is also set on the welding jig 70 in such a manner that a plurality of positioning components 80 are respectively inserted between a corresponding pair of teeth 4 in the second block B.

[0066] The third and subsequent blocks B are also sequentially arranged on the welding jig 70 in the following manner: while the angle of the reference position is staggered by a predetermined angle relative to the reference position of the previous block B, each positioning member 80 is inserted between the corresponding pair of teeth 4. When arranged on the welding jig 70, the circumferential positions of the blocks B are restricted by the plurality of positioning members 80, and the circumferential positions are positioned. In the process of stacking the plurality of blocks B, rotational stacking is performed, so that the angles of the reference positions (the positions in the circumferential direction) are different between the adjacent blocks B of the stacked body 1A formed on the welding jig 70.

[0067] After stacking the multiple blocks B on the welding jig 70, the expansion component 74 is used to perform radial positioning. For example, the multiple expansion and contraction parts 74a move radially from the axis Ax toward the outside. Therefore, the outer peripheral surface of the expansion and contraction part 74a abuts against the inner peripheral surface of each of the multiple blocks B stacked on the welding jig 70. As a result, an outward force is applied to each block B. The welding jig 70, for example, has a component for positioning the outer peripheral surface of the multiple blocks B in the radial direction. If an outward force is applied in the radial direction by the multiple expansion and contraction parts 74a, the multiple blocks B (stacked body 1A) are clamped in the radial direction between the expansion and contraction parts 74a and the positioning component on the outer peripheral surface side. As a result, the multiple blocks B are positioned in the radial direction.

[0068] Next, a process (welding process) of welding the plurality of blocks B in a state of being stacked on the welding jig 70 is performed. In the welding process, for example, an upper plate of the welding jig 70 is placed on the stack 1A formed on the welding jig 70. Then, the driving unit lowers the upper plate toward the stack 1A (lower plate 72). Thus, a load of a predetermined magnitude is applied to the stack 1A while the stack 1A is clamped by the lower plate 72 and the upper plate. In a state where the load is applied to the stack 1A (in a state where the stack 1A is pressurized), the stack 1A is welded by the welding machine 76. By welding by the welding machine 76, for example, a plurality of weld beads 9 extending in the stacking direction are formed (see FIG. 1 ). Figure 1 ). Through the above steps, the laminated core 1 (stator laminated core) is manufactured.

[0069] [Modifications]

[0070] The disclosure in this specification should be considered to be illustrative in all aspects and not restrictive. Various omissions, substitutions, changes, etc. may be made to the above examples without departing from the scope of the claims and the gist thereof.

[0071] The punched parts W in the block B may be connected or joined to each other by various known methods instead of riveting. The multiple punched parts W included in the block B may be connected to each other using an adhesive or a resin material. Alternatively, temporary rivets may be provided on the punched parts W, and after the multiple punched parts W are connected to each other by temporary rivets to obtain a temporary laminate, the temporary rivets are removed from the temporary laminate to obtain the block B. "Temporary rivets" refer to rivets that are used to temporarily integrate multiple punched parts W and are removed during the process of manufacturing the product (laminated core 1).

[0072] In the above example, a plurality of blocks B are stacked in the welding device 60, but a portion of the welding jig 70 may be used to stack the plurality of blocks B before being transported by the conveyor 50. A portion of the welding jig 70 (for example, a portion including the lower plate 72 and the plurality of positioning members 80) may be used as a transport member before being transported by the conveyor 50. A plurality of blocks B may be stacked while being rotated on the transport member before being transported by the conveyor 50, thereby forming the stacked body 1A. The transport member in a state where the stacked body 1A is formed may be transported to the welding device 60 by the conveyor 50.

[0073] In the above example, the cross-sectional shape of the positioning member 80 perpendicular to the axis Ax is circular. The cross-sectional shape of each of the plurality of positioning members 80 may be elliptical or polygonal (e.g., quadrilateral). The cross-sectional shapes of the positioning members 80 may also be different from each other. The welding jig 70 may not have the diameter expansion member 74.

[0074] like Fig. 7A As shown, the welding fixture 70 may also have a plurality of positioning components 82 instead of the plurality of positioning components 80. Fig. 7A , one positioning member 82 among the plurality of positioning members 82 is shown. The plurality of positioning members 82 are respectively formed so that the cross-sectional shape orthogonal to the axis Ax (the extension direction of the positioning member 82) extends radially. In this example, one positioning member 82 among the plurality of positioning members 82 constitutes a first positioning portion, and another positioning member 82 constitutes a second positioning portion. The cross-sectional shape of the positioning member 82 may be a quadrilateral so that at least a portion of the plurality of positioning members 82 is block-shaped.

[0075] like Figure 7B As shown in FIG. 1 , even if the stacked body 1A is positioned by the expansion member 74 and the positioning member 82, it may tilt (topple) in the stacked body 1A. After the stacked body 1A is formed on the welding jig 70, the upper plate 78 is placed on the stacked body 1A to apply a load (pressure) to the stacked body 1A in the stacking direction. Depending on the degree of tilt in the stacked body 1A, when a load is applied, as shown in FIG. Figure 7B As shown by the dotted arrow in , a horizontal force (along the upper surface of the lower plate 72) may be applied to the positioning member. As a result, the positioning member may tilt, and the stacking deviation between the plurality of blocks B in the circumferential direction may increase. In contrast, by extending the cross-sectional shape of the positioning member 82 in the radial direction, the rigidity of the positioning member 82 can be increased, and the possibility of the positioning member tilting can be reduced.

[0076] In the above example, one positioning component is used to limit the position of a pair of adjacent teeth 4 in the circumferential direction, but two or more components may be used to limit the position of a corresponding pair of teeth 4 in the circumferential direction. Fig. 8A and Figure 8B As shown, the welding jig 70 may also include a plurality of positioning members 84 instead of the plurality of positioning members 80. The plurality of positioning members 84 may each include more than two positioning pins.

[0077] In one example, each of the plurality of positioning members 84 includes a positioning pin 85a and a positioning pin 85b. Fig. 8A As shown, in a top view, the positioning pins 85a and 85b are arranged in a state of being separated from each other. The positioning pins 85a and 85b are arranged on a circumference centered on the axis Ax. When a plurality of blocks B are stacked on the welding fixture 70, the positioning pins 85a and 85b are located between a pair of teeth 4 adjacent to each other. The positioning pins 85a and 85b limit the position of the corresponding pair of teeth 4 in the circumferential direction.

[0078] When the plurality of blocks B are stacked on the welding jig 70, a gap is formed between the positioning member 84 including the positioning pin 85a and the positioning pin 85b and the corresponding pair of teeth 4. When the plurality of blocks B are stacked on the welding jig 70, the positioning pin 85a is located near one of the pair of teeth 4, and the positioning pin 85b is located near the other of the pair of teeth 4. Figure 8B is from Fig. 8A The side view as viewed from the arrow “V3” in the figure. Figure 8B As shown, a gap is formed between the positioning pin 85a and one tooth portion 4, and a gap is formed between the positioning pin 85b and the other tooth portion 4. Fig. 6A as well as Figure 6B The gap ga in corresponds to the gap between the positioning pin 85b and the other tooth portion 4, and Fig. 6A as well as Figure 6B The gap gb in corresponds to .

[0079] In the case of focusing on a positioning component 84, with the use of Figure 4A or Figure 5 In the case of the welding jig 70 shown as an example, the total values ​​of the sizes of the gaps ga and gb in the plurality of blocks B can be substantially equal to each other. Figure 4A or Figure 5 Similarly to the illustrated welding jig 70 , the total value of the sizes of the gap ga and the gap gb at one positioning member 84 can be substantially equal to the total value of the sizes of the gap ga and the gap gb at the other positioning member 84 .

[0080] One of the multiple positioning components 84 is marked as "positioning component 84A" and the other is marked as "positioning component 84B". The size of the gap between the positioning component 84A and a pair of teeth 4 corresponding to the positioning component 88A can be roughly consistent with the size of the gap between the positioning component 84B and a pair of teeth 4 corresponding to the positioning component 84B. In this case, the total value of the size of the gap ga at the positioning component 84A (first positioning portion) and the size of the gap gb can be roughly consistent with the total value of the size of the gap ga at the positioning component 84A (first positioning portion) and the size of the gap gb. When the block B is set on the welding fixture 70, it is necessary to insert a plurality of positioning components 84 (for example, a plurality of groups of positioning pins 85a, 85b) respectively between a pair of teeth 4 and overlap the blocks B. In this case, the plurality of positioning components 84 are used to limit the circumferential position of each of the plurality of blocks B, and perform circumferential positioning. When the pair of teeth 4 whose circumferential positions are restricted by the positioning member 84A constitutes a pair of first teeth, the pair of teeth 4 whose circumferential positions are restricted by the positioning member 84B constitutes a pair of second teeth.

[0081] In the above example, a positioning component limits the position of a corresponding pair of teeth 4 in the circumferential direction, but it can also be that the positioning component sandwiches a corresponding tooth 4 in the middle to limit the position of the tooth 4 in the circumferential direction. Fig.9A and Fig. 9B As shown, the welding jig 70 may also include a plurality of positioning members 88 instead of the plurality of positioning members 80. Each of the plurality of positioning members 88 includes, for example, a positioning block 89a and a positioning block 89b.

[0082] like Fig.9A As shown, from a top view, the positioning block 89a and the positioning block 89b are arranged in a state of being separated from each other. The positioning block 89a and the positioning block 89b are arranged on a circumference centered on the axis Ax. When a plurality of blocks B are stacked on the welding fixture 70, the positioning block 89a and the positioning block 89b are located at a position where a tooth portion 4 is sandwiched in the middle. The positioning block 89a and the positioning block 89b limit the circumferential position of a corresponding tooth portion 4. In the case of using a welding fixture 70 having a plurality of positioning components 88, one positioning component 88 among the plurality of positioning components 88 constitutes a first positioning portion, which limits the circumferential position of a tooth portion 4 (first part) corresponding to the positioning component 88. In addition, another positioning component 88 among the plurality of positioning components 88 constitutes a second positioning portion, which limits the circumferential position of another tooth portion 4 (second part) corresponding to the positioning component 88.

[0083] When a plurality of blocks B are stacked on the welding jig 70, a gap is formed between the positioning member 88 including the positioning block 89a and the positioning block 89b and a corresponding tooth portion 4. In addition, there is also a case where the tooth portion 4 of a part of the block B contacts either the positioning block 89a or the positioning block 89b.

[0084] Fig. 9B is from Fig.9A Side view as viewed from arrow “V4”. Fig. 9B As shown, a gap ga1 is formed between the positioning block 89a and the tooth portion 4, and a gap gb1 is formed between the positioning block 89b and the tooth portion 4. The size of the gap between the positioning member 88 including the positioning block 89a and the positioning block 89b and the corresponding tooth portion 4 is represented by the sum of the size of the gap ga1 and the size of the gap gb1. The size of the gap ga1 is defined by the shortest distance between the positioning block 89a and the corresponding tooth portion 4. The size of the gap gb1 is defined by the shortest distance between the positioning block 89b and the corresponding tooth portion 4.

[0085] When focusing on one positioning member 88, the sum of the size of the gap ga1 and the size of the gap gb1 in one block B may be substantially consistent with the sum of the size of the gap ga1 and the size of the gap gb1 in another block B. In other words, the size of the gap between the positioning member 88 and the corresponding tooth portion 4 of one block B may be substantially consistent with the size of the gap between the positioning member 88 and the corresponding tooth portion 4 of another block B. Among all the blocks B, the size of the gap between the positioning member 88 and the corresponding tooth portion 4 (the sum of the size of the gap ga1 and the size of the gap gb1) may be substantially consistent.

[0086] One of the multiple positioning components 88 is marked as "positioning component 88A" and the other is marked as "positioning component 88B". The size of the gap between the positioning component 88A and the tooth portion 4 (first tooth portion) corresponding to the positioning component 88A can be roughly consistent with the size of the gap between the positioning component 88B and the tooth portion 4 (second tooth portion) corresponding to the positioning component 88B. In this case, the total value of the size of the gap ga1 at the positioning component 88A and the size of the gap gb1 can be roughly consistent with the total value of the size of the gap ga1 and the size of the gap gb1 at the positioning component 88B. When the block B is set on the welding fixture 70, it is necessary to insert the corresponding tooth portion 4 between the positioning blocks 89a and the positioning blocks 89b of each of the multiple positioning components 88 while overlapping the blocks B. In this case, the circumferential positions of the multiple blocks B are limited by multiple groups of positioning blocks 89a and positioning blocks 89b (multiple positioning components 88), and the circumferential positioning is performed.

[0087] In the above example, the plurality of blocks B are fixed to each other by welding the stacked body 1A after forming it on a jig such as the welding jig 70, but the plurality of blocks B may be fixed to each other by a method other than welding. When the plurality of blocks B are fixed to each other by a method other than welding, a stacking jig (jig) having a plurality of positioning members 80, 82, 84, 88 provided on the lower plate 72 may be used. As methods other than welding, for example, a method of fixing by stacking and pressurizing while applying an adhesive, and a method of fixing by solidifying a molten resin to form a resin portion.

[0088] The stacked body can be formed by stacking the punched parts W one by one using a welding jig 70 or a jig such as the stacking jig. In this case, each of the plurality of punched parts W included in the stacked body (each punched part W) constitutes a core part. The punched parts W adjacent to each other in the stacked body can be connected by welding, applying an adhesive, bonding steel plates, or forming a resin portion.

[0089] After forming a plurality of punched parts W by the punching processing device 40, a temporary stacked body can be formed by stacking the plurality of punched parts W. Then, the punched parts W can be taken out one by one from the temporary stacked body, an adhesive can be applied to the main surface of the punched parts W, and the plurality of punched parts W can be stacked one by one on the stacking jig. After forming a stacked body on the stacking jig by stacking the plurality of punched parts W coated with the adhesive, the stacked body can be pressurized in the stacking direction. In this example, the punched parts W adjacent to each other in the stacking direction are fixed to each other by the applied adhesive.

[0090] The metal plate MS punched out by the punching device 40 may include a coating having an adhesive function. The metal plate MS (adhesive steel plate) formed with a coating having an adhesive function may be punched out by the punching device 40 to form a plurality of punched parts W including the coating. A stacked body may be formed by stacking a plurality of punched parts W including the coating on a stacking jig. After forming the stacked body on the stacking jig, the punching device 40 may heat the stacked body while applying pressure to the stack in the stacking direction on the stacking jig to solidify the coating having an adhesive function. By solidifying the coating, the punched parts W adjacent to each other in the stacking direction are fixed to each other (integrated).

[0091] In the above example, when the block B is positioned in the circumferential direction, the circumferential position of the tooth portion 4 is limited by the positioning components of the jig such as the welding jig 70, but the circumferential position of the portion other than the tooth portion 4 may also be limited by the positioning components of the jig. In one example, the circumferential position of the positioning groove provided on the outer circumferential surface of the yoke 2 or the through hole formed in the bulge provided on the outer circumferential surface of the yoke 2 may be limited by the positioning portion of the jig. When a plurality of blocks B or a plurality of blanking parts W are stacked on the jig, a gap may be formed between the positioning portion and the positioning groove or through hole (surfaces dividing these grooves or through holes).

[0092] In the above example, the laminated core 1 is an iron core for a stator (stator laminated core), but the laminated core 1 may also be an iron core for a rotor (rotor laminated core). The iron core for a rotor may be cylindrical, and a center hole (through hole) extending in the stacking direction may be formed in the iron core. The block B and the punched part W may have a shape corresponding to the rotor laminated core. In the case where the laminated core 1 is an iron core for a rotor, a plurality of blocks B or a plurality of punched parts W are stacked on a fixture provided with a plurality of positioning parts that limit the position in the circumferential direction. The circumferential position of the positioning grooves provided on the outer circumferential surface or inner circumferential surface of the block B, etc., or the through holes such as magnet holes provided with permanent magnets may also be limited by the plurality of positioning parts of the fixture.

[0093] In the various examples described above, at least a part of the matters described in one example may also be applied to other examples.

[0094] [Effects of Embodiment]

[0095] The manufacturing method of the laminated core 1 described above includes: a forming step of punching a metal plate MS along a predetermined shape to form a plurality of core components; and a stacking step of stacking a plurality of core components on a jig having a first positioning portion and a second positioning portion arranged at different positions in the circumferential direction around a predetermined axis Ax. The first positioning portion limits the circumferential position of the first part of each of the plurality of core components. The second positioning portion limits the circumferential position of the second part of each of the plurality of core components. In the stacking step, the plurality of core components are stacked on the jig in a manner such that a gap is provided between the first part and the first positioning portion and between the second part and the second positioning portion.

[0096] For example, in the case where the teeth of two parts are respectively engaged with two positioning parts (between two sets of positioning pins) as described in patent document 1, due to manufacturing errors, etc., there is a possibility that the teeth interfere with the positioning parts, and the blanking parts (core materials) cannot be set on the fixture. In addition, as a method for positioning in the circumferential direction when stacking multiple core parts on a fixture, it is considered to perform the positioning based on one part of the multiple core parts (for example, one tooth part of each of the multiple core parts constituting the stator laminated core, hereinafter referred to as the "target part") as a reference. In this method, the positioning parts are brought into contact with the target part in the circumferential direction, so that the positions of the target parts of each of the multiple core parts in the circumferential direction are aligned. However, in other parts of each of the multiple core parts corresponding to the target part and located at different positions in the circumferential direction (for example, another tooth part of each of the multiple core parts), the stacking offset in the circumferential direction becomes larger due to manufacturing errors, etc. In one example, when multiple core parts constitute the stator laminated core, the stacking offset becomes larger in other teeth other than the tooth part serving as the reference of the target part. As a result, when the entire laminated core is considered, the maximum value of the scale indicating the magnitude of the lamination deviation between the teeth that overlap each other becomes larger.

[0097] Compared with the method of positioning in the circumferential direction based on one part as a reference, in the manufacturing method of the laminated core 1 described above, when a plurality of core components are stacked on a fixture, a gap is provided between the first part and the first positioning part and between the second part and the second positioning part. Thus, when the core components are stacked on the fixture, the positions of the first parts of each of the plurality of core components and the second parts of each of the plurality of core components in the circumferential direction are adjusted within the range specified by the positioning part. Therefore, it is not easy to have the following situation: as in the above method, the stacking offset in the first part is extremely small, but the stacking offset in the second part becomes large. As a result, for the plurality of core components stacked on the fixture, the degree of stacking offset can be reduced as a whole. In other words, for the plurality of core components on the fixture, the maximum value of the scale representing the size of the stacking offset on the part where the position of each of the plurality of core components is to be made consistent in the circumferential direction can be reduced. Therefore, the present manufacturing method is useful for reducing stacking offset.

[0098] The manufacturing method described above may further include a welding step in which a plurality of core components stacked on a jig are welded. In this method, welding can be performed in a state in which the positions of the plurality of core components in the circumferential direction are reduced as a whole. As a result, a laminated core in a state in which the stacking deviation is reduced can be obtained.

[0099] In the manufacturing method described above, when a plurality of core components are stacked on a jig, the size of the gap between the first portion and the first positioning portion and the size of the gap between the second portion and the second positioning portion may be substantially the same. In this case, between the first portion and the second portion, the adjustable range specified by the positioning portion when stacked on the jig is substantially the same. Therefore, for a plurality of core components stacked on the jig, the degree of stacking deviation can be further reduced as a whole. Therefore, it is more useful for reducing stacking deviation.

[0100] In the manufacturing method described above, the first positioning portion and the second positioning portion may be respectively formed so that the cross-sectional shape orthogonal to the axis extends radially along a circle centered on the axis. In this case, the rigidity of each of the first positioning portion and the second positioning portion is improved. If the plurality of core components on the fixture are pressurized in the stacking direction, the following situation may occur: an external force is applied to the positioning portion in a direction intersecting the stacking direction, the positioning portion falls over, and the restriction on the circumferential position based on the positioning portion is released. In contrast, in the above method, since the rigidity of the positioning portion is improved, the positioning portion is difficult to fall over due to the external force generated by the pressure in the stacking direction. As a result, the possibility of the restriction on the position by the positioning portion being released is reduced. Therefore, it is more useful for reducing stacking deviation.

[0101] In the manufacturing method described above, each of the plurality of core components may include: a yoke 2 formed in an annular shape; and a plurality of teeth 4 intersecting and extending with the yoke 2. The first portion may be a pair of first teeth adjacent to each other among the plurality of teeth 4, and the second portion may be a pair of second teeth adjacent to each other among the plurality of teeth 4. The first positioning portion may be formed so that when the plurality of core components are stacked on the fixture, the first positioning portion is located between the pair of first teeth in the circumferential direction. The second positioning portion may be formed so that when the plurality of core components are stacked on the fixture, the second positioning portion is located between the pair of second teeth in the circumferential direction. In this case, the position of the teeth 4 can be directly adjusted (restricted) in the circumferential direction, so that the stacking offset of each of the plurality of teeth 4 can be reduced compared to the method of positioning at a position other than the teeth 4. Therefore, it is useful to reduce the stacking offset of the teeth 4.

[0102] In the manufacturing method described above, each of the plurality of core components may include: a yoke 2 formed in an annular shape; and a plurality of teeth 4 intersecting and extending with the yoke 2. The first portion may be a first tooth portion among the plurality of teeth 4, and the second portion may be a second tooth portion among the plurality of teeth 4. The first positioning portion may be formed so that when the plurality of core components are stacked on the fixture, the first positioning portion clamps the first tooth portion in the circumferential direction. The second positioning portion may be formed so that when the plurality of core components are stacked on the fixture, the second positioning portion clamps the second tooth portion in the circumferential direction. In this case, the position of the tooth portion 4 can be directly adjusted (restricted) in the circumferential direction, so that the stacking offset of each of the plurality of teeth 4 can be reduced compared to the method of positioning at a position other than the tooth portion 4. Therefore, it is useful to reduce the stacking offset of the tooth portion 4.

[0103] It may be that the stacking process includes: stacking a plurality of core components on a fixture while making the reference positions of each of the plurality of core components relatively offset in the circumferential direction. In this method, since the so-called rotational stacking is performed, the deviation of the plate thickness is reduced in the plurality of core components stacked on the fixture. On the other hand, by performing rotational stacking, the difference in the position in the circumferential direction between the first parts of each of the plurality of core components and between the second parts of each of the plurality of core components may become larger regardless of whether positioning is performed. As a result, if the circumferential position is aligned based on one part as a reference, sometimes the difference in the circumferential position in other parts of each of the plurality of core components will become larger. In contrast, in the manufacturing method of the laminated core 1 described above, the stacking offset as a whole is reduced. Therefore, the use of this manufacturing method is useful for reducing the stacking offset. In addition, when the angle of the rotational stacking is 360° / N and N is a natural number greater than 3, there is a tendency that the difference in the circumferential position will become larger regardless of whether positioning is performed, and the use of this manufacturing method is useful for reducing the stacking offset.

[0104] [Note]

[0105] The present disclosure may include the methods of the following Notes 1-7.

[0106] <Additional Note 1>

[0107] A method for manufacturing a laminated core, comprising:

[0108] a forming step of punching a metal plate into a predetermined shape to form a plurality of core components; and

[0109] a stacking step of stacking the plurality of core members on a jig having a first positioning portion and a second positioning portion disposed at different positions in a circumferential direction around a predetermined axis,

[0110] The first positioning portion limits the position of the first portion of each of the plurality of core members in the circumferential direction.

[0111] The second positioning portion limits the position of the second portion of each of the plurality of core members in the circumferential direction.

[0112] In the stacking step, the plurality of core members are stacked on the jig so that gaps are provided between the first portion and the first positioning portion and between the second portion and the second positioning portion.

[0113] <Note 2>

[0114] The manufacturing method according to Supplementary Note 1 further includes a welding step of welding the plurality of core members stacked on the jig.

[0115] <Addendum 3>

[0116] A manufacturing method as described in Note 1 or 2, wherein, when the plurality of core components are stacked on the fixture, the size of the gap between the first portion and the first positioning portion is substantially consistent with the size of the gap between the second portion and the second positioning portion.

[0117] <Addendum 4>

[0118] A manufacturing method as described in any one of Supplementary Notes 1 to 3, wherein the first positioning portion and the second positioning portion are respectively formed so that a cross-sectional shape orthogonal to the axis extends along a radial direction of a circle centered on the axis.

[0119] <Addendum 5>

[0120] The manufacturing method as described in any one of Notes 1 to 4, wherein

[0121] Each of the plurality of core members includes: a yoke portion formed in an annular shape; and a plurality of teeth portions extending and crossing the yoke portion.

[0122] The first portion is a pair of first teeth portions adjacent to each other among the plurality of teeth portions,

[0123] The second portion is a pair of second teeth portions adjacent to each other among the plurality of teeth portions,

[0124] The first positioning portion is formed so that when the plurality of core members are stacked on the jig, the first positioning portion is located between the pair of first teeth in the circumferential direction.

[0125] The second positioning portion is formed so as to be located between the pair of second teeth portions in the circumferential direction when the plurality of core members are stacked on the jig.

[0126] <Addendum 6>

[0127] The manufacturing method as described in any one of Notes 1 to 4, wherein

[0128] Each of the plurality of core members includes: a yoke portion formed in an annular shape; and a plurality of teeth portions extending and crossing the yoke portion.

[0129] The first portion is a first tooth portion of the plurality of tooth portions,

[0130] The second portion is a second tooth portion of the plurality of tooth portions,

[0131] The first positioning portion is formed so as to clamp the first tooth portion in the circumferential direction when the plurality of core members are stacked on the jig.

[0132] The second positioning portion is formed so as to sandwich the second teeth portion in the circumferential direction when the plurality of core members are stacked on the jig.

[0133] <Addendum 7>

[0134] The manufacturing method according to any one of Supplementary Notes 1 to 4, wherein the stacking step includes stacking the plurality of core members on the jig while relatively shifting reference positions of the plurality of core members in the circumferential direction.

[0135] This application appropriately refers to the contents disclosed in Japanese Patent Application No. 2022-119741 filed on July 27, 2022.

[0136] Description of Reference Numerals

[0137] 1…laminated core, 2…yoke, 4…tooth, B…block, W…punched part, MS…metal plate, 70…welding jig, Ax…axis line, 80, 82, 84, 88…positioning part, ga, gb, ga1, gb1…gap.

Claims

1. A method for manufacturing a laminated core, comprising: A forming step of punching a metal plate along a predetermined shape to form a plurality of core components; as well as a stacking step of stacking the plurality of core members on a jig having a first positioning portion and a second positioning portion disposed at different positions in a circumferential direction around a predetermined axis, The first positioning portion limits the position of the first portion of each of the plurality of core members in the circumferential direction. The second positioning portion limits the position of the second portion of each of the plurality of core members in the circumferential direction. In the stacking step, the plurality of core members are stacked on the jig so that gaps are provided between the first portion and the first positioning portion and between the second portion and the second positioning portion.

2. The manufacturing method according to claim 1, characterized in that The method further includes a welding step of welding the plurality of core members stacked on the jig.

3. The manufacturing method according to claim 1, characterized in that: When the plurality of core members are stacked on the jig, a size of a gap between the first portion and the first positioning portion and a size of a gap between the second portion and the second positioning portion are substantially equal.

4. The manufacturing method according to claim 1, characterized in that: The first positioning portion and the second positioning portion are each formed so that a cross-sectional shape perpendicular to the axis extends along a radial direction of a circle centered on the axis.

5. The manufacturing method according to any one of claims 1 to 4, characterized in that: Each of the plurality of core members includes: a yoke portion formed in an annular shape; and a plurality of teeth portions extending and crossing the yoke portion. The first portion is a pair of first teeth portions adjacent to each other among the plurality of teeth portions, The second portion is a pair of second teeth portions adjacent to each other among the plurality of teeth portions, The first positioning portion is formed so that when the plurality of core members are stacked on the jig, the first positioning portion is located between the pair of first teeth in the circumferential direction. The second positioning portion is formed so as to be located between the pair of second teeth portions in the circumferential direction when the plurality of core members are stacked on the jig.

6. The manufacturing method according to any one of claims 1 to 4, characterized in that: Each of the plurality of core members includes: a yoke portion formed in an annular shape; and a plurality of teeth portions extending and crossing the yoke portion. The first portion is a first tooth portion of the plurality of tooth portions, The second portion is a second tooth portion of the plurality of tooth portions, The first positioning portion is formed so as to clamp the first tooth portion in the circumferential direction when the plurality of core members are stacked on the jig. The second positioning portion is formed so as to sandwich the second teeth portion in the circumferential direction when the plurality of core members are stacked on the jig.

7. The manufacturing method according to any one of claims 1 to 4, characterized in that: The stacking step includes stacking the plurality of core members on the jig while relatively shifting reference positions of the plurality of core members in the circumferential direction.

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