JP4648716B2 - Laminated iron core and manufacturing method thereof - Google Patents

Description

  The present invention relates to a laminated core used for a stator or rotor for an electric motor and a method for manufacturing the same, and in particular, each iron core plate aligned and stacked (vertically laminated) by a progressive die apparatus is temporarily fixed to each other by caulking and coupling means. The present invention relates to a laminated iron core capable of giving a skew rotation of a desired angle after being taken out from a progressive die apparatus and subjected to winding, and a manufacturing method thereof.

  For laminated cores for electric motors, the stacking is performed to correct variations in stacking thickness due to deviations in the thickness of each laminated core, and skew rotation is used to reduce torque fluctuation and noise due to gogging. The stacking is performed at the time of stacking by the progressive die device, and in particular, as a method for imparting the skew rotation, the stacking iron cores that are aligned and stacked are forwarded at the time of stacking by the progressive die device. Sometimes after removing from the mold device.

  When skew rotation is applied at the time of stacking using a progressive mold apparatus, it is necessary to provide a rotation mechanism that rotates the skew in the progressive mold apparatus, and particularly when rotating and stacking, an indexing mechanism that combines both is necessary. Therefore, there is a risk that the structure and control of the mold apparatus may be complicated, the work efficiency may be reduced, and the slot portions of each iron core plate are in an inconsistent state. The work of mounting the pre-wound coil assembly cannot be easily and efficiently performed.

  Therefore, the stacked mold cores are aligned and stacked so that the slot portions of each iron core plate are aligned during stacking, and the stacked stacked cores are taken out from the progressive mold device, and the slot portions are automatically wound by an automatic winding machine. After applying the winding or mounting the coil assembly, a method of applying skew rotation using a special tool or the like is adopted, and this facilitates winding to the laminated iron core to improve work efficiency. Such prior arts have been proposed in, for example, Patent Documents 1 to 10.

JP-A-55-53157 JP 58-212355 A JP-A-61-1235 Japanese Patent Laid-Open No. 61-295847 Japanese Patent Laid-Open No. 5-115156 JP 2001-8417 A JP 2004-173475 A JP 2004-328865 A JP-A-11-155246

  In these prior arts, the iron core plates are not connected to each other and stacked in a skew tool and rotated by skew (Patent Document 1), a V-shaped concave portion that is sequentially displaced in the circumferential direction. And the core plates formed with the convex portions are laminated in a temporarily assembled state, and this is compressed from the axial direction to rotate the skew (Patent Document 2). After stopping, there is a device (patent documents 3, 4, and 5) in which a temporary fixing member is removed and a rod-like twisting member is attached to an outer circumferential groove or slot to rotate the skew.

  In addition, the iron core plates having concave grooves on the inner peripheral surface are connected in a semi-caulked state with V-groove protrusions and aligned and stacked, and the protrusion-shaped locking tool is inclined in the axial direction on the inner peripheral surface. When the groove is pressed from the upper surface in a state where the groove is fitted to the locking tool, the protrusion is caulked and coupled while being rotated along the locking tool (Patent Document 6). And the iron core plates having long holes in which the protrusions are loosely fitted are aligned and stacked, and when the laminated core is rotated in one direction, the protrusions move in the long holes and rotate skew (Patent Document 7).

  Furthermore, caulking protrusions (protrusions) and caulking holes (openings or receiving areas) are provided at different positions on the same radius with respect to each iron core plate, and the caulking protrusions of one iron core plate adjacent to the upper and lower sides fit into the caulking holes in the other iron core plate. The caulking holes are formed long in the circumferential direction so that they can be joined together, so that a rotatable gap is formed when the caulking protrusions are fitted, and the caulking protrusions move within the range of movement relative to the caulking holes. There exists what enables it to rotate (patent documents 8 and 9).

  However, in the case of the prior arts such as Patent Document 1 and Patent Documents 3, 4 and 5, there is an advantage that skew can be freely given. However, after punching each iron core plate with a progressive die apparatus, The necessary number of iron core plates are taken out, and in the former case, each iron core plate is sequentially mounted on the mold, and in the latter case, a complicated work of attaching / detaching the temporary fixing member is required. Compared to a case where a predetermined number of core plates required as a laminated core are taken out from a mold apparatus in a lump and given a skew, it is not suitable for mass production with high work efficiency.

  Further, in the case of the prior art such as Patent Document 2, the iron core plates are temporarily assembled while being supported by the shaft hole guide rod and the slot guide rod without being connected to each other. As in the case of 3, 4, 5, etc., in addition to being suitable for mass production with high work efficiency, winding work is performed in an unstable state with gaps in each iron core plate, V-shaped Since the fitting of the concave portion and the convex portion is displaced in the circumferential direction to impart the skew, there is a problem that the skew rotation is limited to a certain angle.

  Further, in the case of the prior art such as Patent Document 6, the iron core plates are connected to each other in a semi-caulked state by V-groove projections, so that the problems of Patent Documents 1 to 5 described above are solved. However, since the iron core plates are relatively firmly connected by the V-groove-shaped protrusions, the laminated iron core is fitted in a state in which the concave groove on the inner peripheral surface is fitted to the locking tool of the mold. Even if the upper surface is pressed, it is difficult to rotate each iron core plate smoothly to apply skew, and there is a problem that the application of skew is limited to one direction.

  Further, in the case of the prior art such as Patent Document 7, each of the iron core plates has two types of iron core plates in a positional relationship that is relatively rotated by 45 degrees in the progressive die device in order to align the elongated holes and the protrusions. Since it is necessary to punch and stack the layers alternately, there is a risk of complicating the mold apparatus and reducing the work efficiency, and each core plate of the stacked stacked cores has loose holes and protrusions. Therefore, there has been a problem that when an external force is applied during removal from the mold apparatus or during winding work, the winding work is liable to shift in the skew direction, which may hinder winding work.

  In the case of the prior art such as Patent Document 8, it is necessary to alternately stack two types of core plates having caulking protrusions and iron core plates having caulking holes by punching in a progressive die apparatus. In Patent Document 9, it is necessary to stack the protrusions and openings or receiving areas punched in separate steps on each iron core plate in an aligned state, so that the mold apparatus is complicated as in Patent Document 7 and the like. In addition, there is a possibility that the work efficiency may be lowered, and when the caulking protrusion (protrusion) and the caulking hole (opening or receiving area) are firmly fixed, each iron core plate is smoothly skewed as in Patent Document 6 and the like. There were problems such as being difficult to rotate.

  Therefore, the present invention provides a laminated iron core and a method for manufacturing the same, which can solve these problems of the prior art, and each iron core plate that is aligned and stacked (vertically laminated) by a progressive die device is mutually connected by caulking and coupling means. In addition to temporary fixing, it is possible to apply a skew rotation at a desired angle after taking out from the progressive die device and winding it, and in particular, improving the caulking coupling means for temporarily fixing each iron core plate to facilitate skew rotation In addition, the main purpose is to make the structure and process of a progressive mold apparatus for punching and aligning (vertically laminating) each iron core plate simple and efficient in operation.

In the laminated iron core according to the present invention, the iron core plates provided with engaging portions on the outer periphery are laminated and connected in an aligned stacked state, and as a caulking coupling means capable of skew rotation after winding , the axis of the iron core plate is centered. and a slidable and rotatable inside this tightening portion in the circumferential direction is formed in an arc shape, the punching portion to secure the skew regions at one or both ends of the caulking portion is provided for caulking recess crimping portion which is punched in half blanking state It is a laminated iron core that is formed by caulking convex portions, and the caulking convex portion of one iron core plate adjacent to the upper and lower sides is fitted into the caulking concave portion of the other iron core plate, and in each iron core plate, from the axis of the iron core plate The distance from the axial center to the inner diameter side of the caulking concave portion is shorter than the distance from the axial center to the inner diameter side of the caulking concave portion, and the distance from the axial center to the outer diameter side of the caulking convex portion is the caulking convex portion. Distance to the outer diameter side of the recess Or the distance from the axial center to the inner diameter side of the caulking convex portion is longer than the distance from the axial center to the inner diameter side of the caulking concave portion, and from the axial center to the outer diameter side of the caulking convex portion. Since the distance is longer than the distance from the axial center to the outer diameter side of the caulking concave portion, the caulking convex portion and the caulking concave portion are caulked and coupled on the inner diameter side or the outer diameter side.

  The laminated iron core according to claim 1, wherein a plurality of the caulking coupling means are provided at predetermined intervals along the circumferential direction of each iron core plate (Claim 2), or the caulking coupling means is provided near both sides of the locking portion. Each is provided (Claim 3), or the caulking portion of the caulking coupling means is the caulking convex portion in an inclined half-drawn state, and the caulking concave portion is also formed in an inclined shape (Claim 4). Can be taken.

  The method of manufacturing a laminated core according to the present invention is a method of manufacturing a laminated core according to any one of claims 1 to 4 in an aligned stacking (vertical laminated) state with a progressive die device, and taking out the laminated core from the progressive die device and winding it. After applying the wire, a skew jig tool is engaged with the engaging portion to twist the laminated iron core, and the caulking portion that is caulked and joined is slid and rotated to the punched portion side at a desired skew angle. I try to make stacked iron cores. (Claim 5)

  In the laminated iron core according to the first aspect of the invention, the caulking convex portion of the one iron core plate adjacent to the upper and lower sides is fitted into the caulking concave portion of the other iron core plate, and the fastening provided on either the inner diameter side or the outer diameter side of the caulking portion. Since it is connected by caulking, skew rotation in the circumferential direction can be performed smoothly. Especially when caulking coupling means are provided at a plurality of locations, the caulking coupling means interfere with each other, and the skew Since rotation is not made difficult and a gap is not generated between the iron core plates, a skew having a desired angle can be easily imparted, and a laminated iron core having good performance with a constant laminated thickness can be obtained.

Further, by providing the punching unit to secure the skew regions at one or both ends of the caulking portion, the punching unit can skew rotate in either direction of the clockwise and counterclockwise direction by the specification, if provided at both ends In addition, it is possible to give a V-shaped skew, and when a punched portion is provided at one end, it can be skewed in either the clockwise direction or the counterclockwise direction to give an oblique skew. .

  Furthermore, since each iron core plate can be punched in the same shape and laminated as it is, two types of iron core plates are alternately punched by a progressive die device or rotated and laminated. Compared to the technology, mass production can be performed with high work efficiency, and the structure of the progressive mold apparatus can be simplified.

  In the laminated iron core according to the second aspect of the present invention, it is possible to perform effective caulking evenly with respect to the whole by each caulking coupling means, and the caulking coupling means interfere with each other to make skew rotation difficult. Since no gap is generated between the iron core plates, a skew of a desired angle can be easily given, and a laminated iron core having a good performance with a constant laminated thickness can be obtained. When the number of places to be provided is increased and the fixing force is strengthened, laser welding or the like applied to the outer periphery of the skew laminated iron core after the skew rotation can be omitted.

The laminated core according to the invention of claim 3, by providing each of the caulking means near both sides of the engaging portion, rotational force is sufficiently respect caulking means when allowed skewed rotated via the engaging portion transmission Therefore, it is possible to prevent the caulking portion from being loosened due to smooth skew rotation, thereby forming a gap.

  In the laminated iron core according to the invention of claim 4, by forming the caulking convex portion and the caulking concave portion of the caulking portion in an inclined shape, there is no interference between the caulking portions of the iron core plates when the skew rotation is performed, and the upper and lower sides are adjacent to each other. Since the gaps between the iron core plates can be reduced, the adhesion is improved and the accuracy of the laminated thickness can be improved.

  In the method for manufacturing a laminated core according to the invention of claim 5, it is possible to easily and efficiently mass-produce a laminated iron core in which each iron core plate is arranged in a stacked state (vertically laminated) with a progressive die device. It is easy to mount the winding or coil assembly on the stacked laminated cores using an automatic winding machine, and it is easy to skew the laminated cores in a desired direction in a desired direction after winding. And the like.

  The laminated core of the present invention and the method of manufacturing the same will be described in detail with reference to the accompanying drawings showing a preferred embodiment in which the present invention is applied to a stator of an electric motor. As shown in the front view of FIG. 2, a predetermined number of iron core plates 2 (2a to 2n) are laminated to form a laminated core 1A in an aligned stack (vertical stack) state shown in FIG. After that, skew rotation is performed to obtain a laminated core 1B in an oblique skew stacking state shown in FIG.

  The iron core plate 2 has an annular outer shape in which a shaft hole 3 for mounting a rotor of an electric motor is bored. A large number of slots 4 for winding are formed on the inner diameter side, and a tool is engaged on the outer surface. In the illustrated embodiment, the engagement groove 5 is formed by a notch having a predetermined width and a predetermined depth in the illustrated embodiment as the engagement means for performing the skew rotation, and caulking adjacent to both sides of each engagement groove 5. The coupling means 6 is provided, and the iron core plates 2 adjacent to each other in the vertical direction are integrally connected via the caulking coupling means 6.

  The caulking coupling means 6 is formed of a caulking portion 7 and punched portions 8 and 9 at both ends thereof as shown in an enlarged view of the main portion in FIG. 3, and the caulking portion 7 has a rectangular plate surface between the punched portions 8 and 9. As shown in FIGS. 4A and 5A, the caulking concave portion 7a is formed on the upper surface side and the caulking convex portion 7b is formed on the lower surface side, but the caulking concave portion 7a is formed. The inner diameter side and the outer diameter side that form the shape are formed as arcuate surfaces that are concentric from the shaft center with predetermined radial dimensions R1 and R2.

  Further, the caulking concave portion 7a and the caulking convex portion 7b of the caulking portion 7, as shown in an exaggerated manner in FIG. 6, are the radial dimension R1t on the inner diameter side and the radial dimension R2t on the outer diameter side of the caulking concave portion 7a, and the caulking convex portion 7b. The relationship between the radial dimension R1u on the inner diameter side and the radial dimension R2u on the outer diameter side is R1t> R1u and R2t> R2u, as shown in FIG. 6A, or a tightening margin 10 is provided on the inner diameter side, or FIG. In this way, the caulking portion 7 is punched in a half-punched state so that R1t <R1u and R2t <R2u, and the allowance 10 is provided on the outer diameter side.

  Thus, when the upper and lower adjacent iron core plates 2 and 2 are caulked and joined by the caulking portion 7, the caulking convex portion 7b of the upper iron core plate with respect to the caulking concave portion 7a of the lower iron core plate is shown in FIG. ) Or the outer diameter side by the radial dimension R2 as the tightening margin 10 as shown in FIG. 5B, and only one of the inner and outer diameters is used as the pressure contact surface. By connecting in a caulking and coupling state, the iron core plates 2 and 2 can be easily rotated in a sliding state in a clockwise direction or a counterclockwise direction.

  Therefore, as shown in FIGS. 2 (a) and 4 (a), a predetermined number of iron core plates 2 (2a to 2n), which are caulked and joined, are stacked, and the stacked stack in which the engagement grooves 5 are aligned in the vertical direction ( A laminated iron core 1A in the state of (vertically laminated) is manufactured, and a skewing tool is engaged with the engaging groove 5 and is slidably rotated between the iron core plates 2 and 2 adjacent to each other vertically. In this range, a skew can be imparted at a desired skew angle by rotating counterclockwise or clockwise.

  In this way, the laminated cores 1A can be wound easily and efficiently by winding the slot 4 with an automatic winding machine or mounting a pre-wound coil assembly. After that, when the engaging groove 5 is engaged with a skewing tool and a twisting force is applied clockwise or counterclockwise, only one of the inner and outer diameters is in pressure contact, so that the skew can be easily rotated. In addition, it is possible to manufacture a laminated iron core 1B in a skewed state in which the engagement grooves 5 are inclined with respect to the vertical direction.

  Next, a manufacturing method for manufacturing the stacked laminated cores 1A using a progressive die apparatus (not shown) will be described with reference to the layout diagram of FIG. , And the pilot hole 12 is intermittently fed in the direction of the arrow in the progressive die apparatus. In step (2), the inner diameter of the shaft hole 3 is punched, and in step (3), the slot 4 is punched. In the step (4), the engaging groove 5 and the punched portions 8 and 9 are punched. In the step (5), the measuring hole 7c is punched out as a caulked portion 7 for the first iron core plate 2 in a completely punched state. In 6), the caulking concave portion 7a and the caulking convex portion 7b are punched in a half-cut state as the caulking portion 7 for the second and subsequent iron core plates 2, and the iron core outer shape 13 is punched in the step (8) after the idle step (7). Predetermined The number of iron core plates 2 is removed.

  Further, in the step (5) of punching the measuring hole 7c into the caulking portion 7 to obtain a measuring iron core plate, the punching punch is protruded from the first iron core plate 2 to a position where it can be punched, and the measuring hole 7c. The length of the punch punch protruding for each predetermined number of sheets is controlled so that the punch punches are retracted to a position where the punch punches cannot be punched with respect to the second and subsequent iron core plates 2 and the next step In (6), the second and subsequent iron core plates 2 having no caulking hole 7c in the caulking portion 7 are punched with the punching punch protruding at a certain length and the caulking concave portion 7a and the caulking convex portion 7b are half punched. To be.

  Then, the measuring iron core plate provided with the measuring hole 7c in the caulking portion 7 and the other iron core plate provided with the caulking concave portion 7a and the caulking convex portion 7b are punched out of the core outer shape 13 in the step (8). However, the caulking protrusion 7b of the iron core plate that has been removed is fitted into the measuring hole 7c of the iron core plate for measurement, and the caulking of the iron core plate 2 that is subsequently removed is caulked. The convex portions 7b are sequentially stacked so as to be fitted into the caulking concave portions 7a of the iron core plate 2, and then the product is separated when the measuring iron core plate provided with the measuring holes 7c is pulled out. A laminated core 1A having the number of laminated layers is obtained.

  Further, in step (8), the caulking concave portion 7a of the iron core plate previously punched and the caulking convex portion 7b of the iron core plate punched next are changed to an inner diameter with a radial dimension R1 as shown in FIG. A measuring iron core plate in which the clamping margin 10 on the side or the clamping margin 10 on the outer diameter side with the radial dimension R2 is pressed and connected to each other in a caulking connection state, and the caulking portion 7 is punched out in a fully punched state. Until it is pulled out, a predetermined number of iron core plates are stacked in a connected state in which the respective engagement grooves 5 are aligned and aligned in the vertical direction, thereby making it possible to manufacture a stacked core 1A that is aligned and stacked.

  Next, a manufacturing method of the skew-stacked laminated core 1B will be described based on the block diagram of FIG. 8. Either clockwise or counterclockwise via a caulking portion 7 having a clamping margin 10 on any one surface as a pressure contact surface and a caulking coupling means 6 provided on both sides thereof to enable skewing. A laminated core 1A of an aligned stack (vertically laminated) temporarily fixed so as to be slidable is made, and the laminated core 1A is taken out from the progressive die apparatus.

  After winding the slot 4 by automatic winding or coil assembly to the laminated core 1A, the laminated core 1A is pressed from above and below as necessary and caulked and coupled with a skewing tool. Engage with the groove 5 and twist in the desired direction, rotate the skew at a desired skew angle to make a stacked core 1B, and press the stacked core 1B from above and below to further secure the caulking. Later, the outer peripheral surface of the laminated core 1B is fixed integrally by welding with a laser or the like, but it is desirable that the pressurization before skew is a weak pressure so as not to inhibit the subsequent skew rotation.

  Next, FIG. 9 shows a modified embodiment of the caulking coupling means 6 shown in FIG. 3. In the previous embodiment, punching portions 8 and 9 are provided at both ends of the caulking portion 7 so that the both directions are clockwise and counterclockwise. Although the skew rotation can be performed in both directions, the skew skew and the V-shaped skew are both possible, but it is also possible to adopt a form in which the skew rotation is performed in one direction and the skew is skewed. In the example, a punching portion 8 is provided at one end of the caulking portion 7 so as to be able to perform a skew rotation in the counterclockwise direction, whereby the same effect as in the previous embodiment can be obtained.

  Next, FIG. 10 shows still another modified embodiment of the caulking coupling means 6. In the previous embodiment, when the caulking portion 7 is punched in a half-punched state, the caulking convex portion 7 b is made horizontal. However, in the caulking coupling means 6 according to the modified embodiment of FIG. 10, the caulking concave portion formed on the upper surface side of the caulking convex portion 7b is punched in a half-punched state so that the caulking convex portion 7b is inclined. The bottom surface of 7a is also formed so as to be inclined, so that when the skew is rotated, the interference of the caulking portion 7 of each iron core plate 2 is eliminated, and the gap between each iron plate 2 adjacent vertically is reduced. As a result, adhesion can be increased and the accuracy of the laminated thickness can be improved.

  The present invention is not limited to the illustrated embodiment and can be modified in various ways within the scope of the gist. For example, in the illustrated embodiment, the caulking and coupling means 6 are provided at eight locations. When the outer peripheral surface of the laminated core 1B in a skewed state is fixed integrally by welding with a laser or the like, it is possible to reduce the number of places where the caulking coupling means 6 is provided (for example, about two places), and caulking. In the case where sufficient fixing can be achieved by increasing the number of places where the coupling means 6 is provided, the fixing by welding such as the laser described above can be omitted.

In the illustrated embodiment, the rotational force is sufficiently transmitted to the caulking coupling means 6 when the skew is rotated through the engaging groove 5, and the caulking portion 7 is loosened due to smooth skew rotation, and a gap is formed. The caulking coupling means 6 are provided in the vicinity of both sides of the engagement groove 5 so that the engagement groove 5 can be prevented. However, it is possible to adopt a form in which the engagement groove 5 is provided in another place. It is also possible to adopt a form in which the engaging groove 5 formed by a notch-shaped slot is formed by a protrusion protruding from the outer peripheral surface of each iron core plate 2.

  In the illustrated embodiment, the measuring hole 7c is punched into the caulking portion 7 in the step (5), and the caulking concave portion 7a and the caulking convex portion 7b are punched into the caulking portion 7 in the step (6). When the process hole (5) and the process (6) are made into one process and the measuring hole 7c is punched out in a fully punched state with respect to the first iron core plate, and with respect to the second and subsequent iron core plates. When the caulking concave portion 7a and the caulking convex portion 7b are punched in a half punched state, it is possible to control to change the position of the bottom dead center of the punch.

  Further, in the illustrated embodiment, the punching portions 8 and 9 of the caulking coupling means 6 are formed by circular holes in order to facilitate the punching process. However, the punching portions 8 and 9 are formed by square holes. In the illustrated embodiment, the present invention is applied to a stator (stator) of an electric motor. However, it can also be applied to a rotor (rotor) of an electric motor based on the same technical idea.

The top view of the laminated iron core by the Example to which this invention is applied is shown. It is a front view of the laminated iron core of FIG. 1, (a) shows the alignment stacking (vertical lamination | stacking) state of each iron core board, (b) shows the diagonal skew stacking state of each iron core board. The explanatory view which expanded the neighborhood of the caulking coupling means which is the principal part of the laminated iron core of Drawing 1 is shown. It is sectional drawing along the AA line of FIG. 3, Comprising: (a) shows the alignment stack (vertical lamination | stacking) state of each iron core board, (b) shows the diagonal skew stacking state of each iron core board. 4A and 4B are cross-sectional views taken along line B-B in FIG. 3, in which FIG. 3A shows a caulking coupled state with an inner diameter side as a tightening margin, and FIG. 3B shows a caulking coupled state with an outer diameter side as a tightening margin. FIG. 3 shows the dimensional relationship of the interference allowance to achieve the caulking connection state of FIG. 3, (a) shows the caulking connection state with the inner diameter side as the interference, and (b) shows the caulking connection state with the outer diameter side as the interference. . The layout figure of the manufacturing method of the laminated iron core by the Example to which this invention is applied is shown. The block diagram of the manufacturing method of the laminated iron core by the Example to which this invention is applied is shown. FIG. 2 is a modified example of the laminated core of FIG. 1, illustrating an enlarged view of the vicinity of a caulking coupling means that is a main part. FIG. 2 shows a cross-sectional view of a caulking coupling means according to a modified embodiment of the laminated iron core of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated core 1A (Arranged stacked) Laminated core 1B (Skew stacked) Laminated core 2 Iron core plate 3 Axle hole 4 Slot 5 Engaging groove (engaging means for skew rotation)
6 Caulking connection means 7 Caulking portion 7a Caulking concave portion 7b Caulking convex portion 7c Measuring hole 8, 9 Punching portion 10 Fastening margin 11 Band-shaped iron plate 12 Pilot hole 13 Iron core outline

Claims (5)

Each iron core plate provided with an engagement portion on the outer periphery is laminated and connected in an aligned state, and is formed in an arc shape centering on the axis of the iron core plate as a caulking coupling means capable of skew rotation after winding. a slidable and rotatable inside this tightening portion in the circumferential direction Te, the punching portion to secure the skew region provided at one or both ends of the caulking portion, the caulking portion is formed by caulking the recess and the caulking protrusion which is punched in half blanking state A laminated iron core in which the caulking convex portion of one iron core plate adjacent to the upper and lower sides is fitted into the caulking concave portion of the other iron core plate ,
In each iron core plate, the distance from the axis of the iron core plate to the inner diameter side of the caulking convex portion is shorter than the distance from the axis to the inner diameter side of the caulking concave portion, and the caulking convex portion of the caulking convex portion The distance from the shaft center to the outer diameter side of the caulking recess is shorter than the distance from the shaft center to the outer diameter side of the caulking recess, or the distance from the axis to the inner diameter side of the caulking projection is the inner diameter side of the caulking recess And the distance from the axial center to the outer diameter side of the caulking convex part is longer than the distance from the axial center to the outer diameter side of the caulking concave part, and the caulking convex part and The laminated iron core is characterized in that the caulking recesses are caulked and joined on the inner diameter side or the outer diameter side .   The laminated core according to claim 1, wherein a plurality of the caulking coupling means are provided at predetermined intervals along a circumferential direction of each iron core plate. The laminated iron core according to claim 1 or 2, wherein the caulking coupling means is provided in the vicinity of both sides of the engaging portion . The caulking convex portion is in an inclined half-drawn state, and the bottom surface of the caulking concave portion is formed in an inclined shape, and the caulking convex portion and the bottom surface of the caulking concave portion are separated from each other by being rotated by skew. The laminated iron core according to any one of claims 1 to 3, wherein the laminated iron core is displaced in a vertical direction.   The laminated iron core according to any one of claims 1 to 4 in an aligned stacking (vertical laminated) state is manufactured by a progressive die device, and after the laminated iron core is taken out from the progressive die device and wound, the engaging portion A skewed jig and tool were engaged to twist the laminated iron core, and the caulked part that was caulked and joined was slid and rotated to the punched part side at the desired skew angle to create a laminated iron core that was skew-stacked. A method of manufacturing a laminated iron core characterized by

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