JP2008278598A - Method of manufacturing laminated core, and laminated core manufactured thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated core, which aligns an inner circular arc of a segment core piece with the periphery of a drum jig by adjusting a side space change between adjacent segment core pieces when bent at a junction, and to provide the laminated core. <P>SOLUTION: In this method of manufacturing the laminated core 10, a plurality of segment core pieces 13 are formed which are coupled with one another at junctions 12 installed in its peripheral region 11 and have several outer recessed cuts 20 and inner recessed cuts 21 outside and inside in its radial direction of the junctions 12 and the segment core pieces 13 are bent at the junctions 12 to be wound spirally around a drum jig 27. (1) when the segment core piece 13 and the drum jig 27 interfere with each other due to insufficient bending of the junction 12, outer coining in the radial direction of the junction 12 is performed, and (2) when the segment iron core piece 13 and the drum jig 27 interfere with each other due to excessive bending of the junction 12, inner coining in the radial direction of the junction 12 is performed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for manufacturing a laminated core in which a plurality of segment core pieces continuous in a strip shape are spirally wound and laminated, and a laminated core produced thereby.

Conventionally, as a method for improving the yield of a core material (for example, a strip) used for manufacturing a laminated core, when punching a core piece from a core material, a plurality of segment core pieces continuous in a strip shape are punched and formed. The laminated iron core is manufactured by laminating the wire while winding the wire. For example, when manufacturing a laminated stator core, arc-shaped segment core pieces having a predetermined number of slots are connected to each other via a connecting portion formed on the outer peripheral side, and a mold is made from the core material. Use to punch. Then, the segment core pieces are bent at the connecting portion, and are wound around the drum jig in a spiral manner and laminated so that gaps formed between the side portions of the adjacent segment core pieces are even in the radial direction. Here, an arc-shaped cutout is formed on the inner side in the radial direction of the connecting portion, and the connecting portion is bent starting from the notch (see, for example, Patent Documents 1 and 2).
When the connecting portion is bent, in particular, the vicinity of the front end of the notch swells in the thickness direction, and a gap is generated between the laminated segment core pieces, resulting in a reduction in lamination strength. For this reason, the radial inner area of the connecting portion including the vicinity of the front end of the notch is thinned by hitting from the vertical direction to reduce the influence of the bulging, thereby preventing a decrease in the lamination strength (for example, Patent Document 2).

Japanese Patent Laid-Open No. 1-264548 JP-A-8-196061

Here, when the segment core pieces are folded at the connecting portion, the gaps (connection widths) between the side portions of adjacent segment core pieces are not uniform in the radial direction, that is, the gaps between the side portions are radially outward. When it is narrow, bending is insufficient, and when the gap between the side portions is narrow on the inside in the radial direction, bending is excessive, and the segment core pieces cannot be wound spirally around the drum jig. For this reason, if the coupling width becomes uneven in the radial direction, the work of punching out the segment core pieces must be stopped, the mold must be removed from the press machine and the adjustment must be performed, and a lot of time is required before the punching work is resumed. There is a problem that requires. Furthermore, if it is necessary to change settings such as connection width, notch shape, iron core material feed pitch, punch shape change, etc., it will be a major mold remodeling, and it is also necessary to perform trial manufacture, preliminary confirmation and investigation, In addition, the problem that more time is required arises.

The present invention has been made in view of such circumstances, and the inner arc of the segment core piece is drummed by adjusting in real time the change in the gap formed between the side portions of the adjacent segment core pieces when bent at the connecting portion. It is an object of the present invention to provide a method of manufacturing a laminated iron core that can be matched with the outer periphery of a jig and a laminated iron core.

According to the first aspect of the invention, there is provided a method for manufacturing a laminated core according to the first aspect of the present invention, wherein a connecting portion provided in an outer peripheral region is connected to each other, and an outer recess notch and an inner recess notch are provided radially outside and inside the connecting portion. Forming a plurality of segment core pieces each having a notch, bending the segment core pieces at the connecting portion, spirally winding around a drum jig, and laminating them;
1) When the segment iron core piece wound with the connecting portion being insufficiently bent interferes with the drum jig, coining on the radially outer side of the connecting portion is performed,
2) When the segment iron core piece wound by excessive bending of the connecting portion and the drum jig interfere with each other, perform coining on the radially inner side of the connecting portion,
The inner arc of the segment core piece formed in advance is matched with the outer periphery of the drum jig.

In the method of manufacturing a laminated core according to the first aspect, it is preferable that the coining on the outer side or the inner side in the radial direction of the connecting portion is performed at a plurality of locations along the circumferential direction of the segment core piece.

In the method for manufacturing a laminated core according to the first aspect of the present invention, it is preferable that side portions of the adjacent segment core pieces are provided with an engaging portion constituted by a concave portion and a convex portion fitted to the concave portion.

The laminated core according to the second aspect of the invention that meets the above object is manufactured by the method for manufacturing a laminated core according to the first aspect of the invention.

In the laminated core manufacturing method according to any one of claims 1 to 3 and the laminated iron core according to claim 4, it is adjacent when bent at the connecting portion by performing coining on the radially outer side or radially inner side of the connecting portion. Changes in the connection width formed between the sides of the segment core pieces can be adjusted in real time (without re-adjusting the mold or remodeling the mold), and the connection width can be made uniform in the radial direction. become. As a result, the inner arc of the segment core piece can be aligned with the outer periphery of the drum jig, and a laminated core with high dimensional accuracy can be manufactured. Furthermore, by coining the connecting portion, the connecting portion becomes thin, and the segment core piece can be easily bent at the connecting portion. Further, since the connecting portion is thinned, the bulging amount in the thickness direction when bent at the connecting portion can be reduced, and a laminated iron core with no variation in thickness can be manufactured.

In particular, in the method for manufacturing a laminated core according to claim 2, by performing coining at a plurality of arbitrary locations along the circumferential direction of the segment core pieces, it is possible to improve the folding accuracy, Adjustment is also easy.

In the method of manufacturing a laminated core according to claim 3, since the engaging portion is provided on the side portion of the adjacent segment core pieces, the segment core pieces are bent at the connecting portion and spiral around the drum jig. Positioning of adjacent segment core pieces at the time of winding can be performed with high accuracy, and the annular accuracy of the laminated core can be improved.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a plan view of a laminated core according to an embodiment of the present invention, FIG. 2 is a partial side view of the laminated core, and FIG. 3 is a partial plan view showing a state before lamination of segment core pieces of the laminated core 4 and 5 are explanatory diagrams of coining in the method for manufacturing the laminated core.

As shown in FIGS. 1 to 3, a laminated core 10 according to an embodiment of the present invention includes a plurality of segment core pieces 13 connected to each other by a connecting portion 12 provided in an outer peripheral region 11. A plurality of continuous segment core pieces 13 are spirally wound around a drum jig 27 (see FIG. 4) and stacked in a vertical direction while the side portions 14 of the segment core pieces 13 are opposed to each other. 2 is a stator laminated iron core that is disposed while shifting the connecting portions 12 provided in layers adjacent to each other in the circumferential direction.

The laminated core 10 has a thickness of, for example, a plurality of segment core pieces 13 joined in a band shape at the connecting portion 12 from a magnetic steel sheet having a thickness of 0.5 mm or less, as shown in FIGS. 1 and 2. The continuous segment core pieces 13 that have been punched are wound and sequentially caulked and laminated. Here, as a method of laminating the plurality of segment core pieces 13, any one of caulking, welding, and adhesion can be applied, and any two or more can be used in combination. Each of the segment core pieces 13 is provided with a plurality of slots 17 on the inner side in the radial direction to form a magnetic pole piece 18 and a yoke piece 19 on the outer side in the radial direction.

An outer recess notch 20 and an inner recess notch 21 are formed on the outer side and the inner side of the connecting portion 12 in the radial direction, respectively. By providing the outer recess notch 20, the radially bulged portion 22 formed on the radially outer side when the connecting portion 12 is bent can be accommodated in the outer circle of the laminated core 10. For this reason, as shown in FIG. 3, before the connection part 12 is bent, the outer periphery of the connection part 12 is recessed inward in the radial direction.

Further, as shown in FIG. 3, the front side of the inner recess notch 21 is formed in an arc shape before the connecting portion 12 is bent, and a bending start point is formed at the tip 23 of the inner recess notch 21. . The front side shape of the inner recess notch 21 before bending may be, for example, an inverted U shape or an inverted V shape in plan view. The inner recess notch 21 is deformed into an elliptical hole after the connecting portion 12 is bent, and a gap is formed between the side portions 14 of the adjacent segment core pieces 13. By forming the gap, the radially outer regions of the side portions 14 of the adjacent segment core pieces 13 can be prevented from coming into contact with each other, and the side portions 14 of the segment core pieces 13 can be opposed to each other.

With the above configuration, the inner recess notch 21 provided in the connecting portion 12 can give a favorable hinge effect to the connecting portion 12 when the connecting portion 12 is bent.
Further, an engaging portion 26 constituted by a concave portion 24 and a convex portion 25 fitted to the concave portion 24 is provided in a radially inner region of the side portion 14 of the adjacent segment core pieces 13. As a result, the adjacent segment core pieces 13 can be positioned with high accuracy, and the annular accuracy can be improved.

When the segment core pieces 13 joined by the connecting portion 12 are wound and stacked as shown in FIGS. 1 and 2, the connecting portions 12 provided between the adjacent segment core pieces 13 are adjacent to each other in the vertical direction. The layers are shifted to different positions in the circumferential direction, and the positions of the magnetic pole piece portions 18 are aligned. In the present embodiment, when the segment core pieces 13 are stacked, they are shifted in the stacking direction by one slot, but two or more slots may be shifted. Here, when the total number of slots per round of the laminated core in plan view is m, and the number of slots per segment core piece (same as the number of magnetic pole pieces) is n, lamination is performed for one slot. When the number of segment core pieces per round necessary for shifting in the direction is k, the following relationship is established.
(M + 1) / n = k
Here, m, n, and k are integers, and can be variously changed according to the manufacturing conditions of the laminated core.

In the present embodiment, as shown in FIG. 1, the total number of slots per round of the laminated core in plan view is 20 (m = 20), and the number of magnetic pole pieces per segment core piece is 3 (slots). Since n = 3) corresponding to several three, the number of segment core pieces required for one turn from the above formula is seven (k = 7), but the magnetic pole piece 1 of the seventh segment core piece. When the layers are stacked, the layer becomes the next layer, and the position of the connecting portion in the stacking direction is shifted by one magnetic pole piece (corresponding to one slot). When the number of slots shifted in the stacking direction is set to two or more, the number of segment core pieces required for one round can be obtained by changing “1” in the above formula to the shifted number, that is, two or more. Accordingly, when the plurality of segment core pieces 13 are wound and stacked, the position of the connecting portion 12 is shifted in the stacking direction, so that the coupling strength of the following segment core pieces 13 can be further strengthened.

Thus, since the position of the connection part 12 shifts | deviates in a lamination direction, the segment core piece 13 and the connection part 12 are arrange | positioned adjacent to the lamination direction. Therefore, the accommodating portion 16 is provided at substantially the same angle (here, the position where the center line of the slot 17 and the center line of the accommodating portion 16 coincide with each other) on the radially outer side of each segment core piece 13, and the connecting portion 12 is bent. Later, the bulging portion 15 formed in the thickness direction is accommodated in the accommodating portion 16 of the segment core piece 13 adjacent in the stacking direction. The housing portion 16 is a notch and has a semicircular shape, but is not limited to this as long as the bulging portion 15 can be disposed in the housing portion 16. (Square or rectangular) may be used. Moreover, the accommodating part 16 should just be the magnitude | size which surrounds the bulging part 15 formed in the connection part 12 at least, and in this Embodiment, the inner side recessed part notch of the segment core piece 13 located in the lamination direction lower side It is set as the magnitude | size which the front side (radial direction outer side) of 21 is exposed. Therefore, the accommodating part 16 may be a hole.

Then, the manufacturing method of the laminated iron core 10 which concerns on one embodiment of this invention is demonstrated.
First, as shown in FIG. 3, a metal mold is used while the electromagnetic steel sheet is being transported, and is connected to each other by a connecting portion 12 provided in the outer peripheral region 11. A plurality of segment core pieces 13 each having a recess notch 20 and an inner recess notch 21 are formed (punched). In forming the segment core piece 13, the A step of forming the outer recess notch 20, the B step of forming the inner recess notch 21, and the accommodating portion 16 are formed after the punching of the slot 17 that is normally performed. Perform step C. Depending on the shape of the mold, the steps A to C can be performed simultaneously, individually or sequentially, and can be performed with the punching of the slots 17.

Next, the connecting portion 12 is bent starting from the tip 23 of the inner recess notch 21 of the connecting portion 12 connecting the segment core pieces 13, and the side portions 14 of adjacent segment core pieces 13 are continuously opposed to each other. The plurality of segment core pieces 13 are spirally wound around the drum jig 27 and laminated, and the laminated core 10 is manufactured while shifting the connecting portion 12 in the lamination direction. Here, in the accommodating portion 16 formed on the outer side in the radial direction of the segment core piece 13, the bulged portions 15 in the thickness direction of the connecting portions 12 adjacent to each other in the stacking direction are respectively arranged. It can be accommodated within the plate thickness of the piece 13, and a gap can be prevented from being generated between the segment core pieces 13 adjacent in the stacking direction.

Here, when forming the laminated core 10 in which the segment core piece 13 is bent at the connecting portion 12 and spirally wound around the drum jig 27 to form a laminated core 10, as shown in FIG. Since the gap between the 13 side portions 14 is narrow on the outer side in the radial direction, if the outer regions in the radial direction of the side portions 14 come into contact with each other when bent at the connecting portion 12, an underbending state occurs. The ends of the magnetic pole piece portions 18 located on both sides of the opening portion of the slot 17 formed so as to interfere (contact) with the surface of the drum jig 27, and the inner arc of the segment iron core piece 13 is drummed. It cannot be wound to match the outer periphery of the tool 27.

Therefore, in this case, the outer side in the radial direction of the connecting portion 12, that is, the region C on the outer recess notch 20 side is coined at a plurality of locations (for example, two to three locations) along the circumferential direction of the segment core piece 13. Then, the region C on the outer recess notch 20 side is extended in the circumferential direction of the segment core piece 13. As a result, the radially outer region expands in the gap between the side portions 14 of the adjacent segment core pieces 13, the contact state in the radially outer region of the side portion 14 is eliminated, and the radial direction of the side portion 14 is increased. The inner region can be brought closer to make the connecting portion 12 bend further, and the bending shortage is eliminated. As a result, it is possible to wind the segment iron core piece 13 so that the inner arc of the segment iron core piece 13 coincides with the outer periphery of the drum jig 27.

Further, when forming the laminated core 10 in which the segment core pieces 13 are bent at the connecting portion 12 and spirally wound around the drum jig 27 to form a laminated core 10, as shown in FIG. Since the gap between the side portions 14 is narrow on the inner side in the radial direction, when the inner portions in the radial direction of the side portions 14 come into contact with each other when bent at the connecting portion 12, an overbending state occurs and the adjacent segment core pieces 13 are surrounded The ends of the magnetic pole piece portions 18 positioned on both sides of the opening portion of the slot 17 thus formed are lifted from the surface of the drum jig 27 (that is, the end of the magnetic pole piece portion 18 on the side away from the opening portion of the slot 17). When the part hits the surface of the drum jig 27), the inner arc of the segment core piece 13 cannot be wound so as to coincide with the outer periphery of the drum jig 27.

Therefore, in this case, the inside of the connecting portion 12 in the radial direction, that is, the region D on the inner recess notch 21 side is coined at a plurality of locations (for example, 2 to 3 locations) along the circumferential direction of the segment core piece 13. Then, the region D on the inner recess notch 21 side is extended in the circumferential direction of the segment core piece 13. As a result, the radially inner region expands in the gap between the side portions 14 of the adjacent segment core pieces 13, and the contact state in the radially inner region of the side portion 14 is eliminated, and the radial direction of the side portion 14 is increased. It is possible to reduce the bending angle of the connecting portion 12 by bringing the outer region closer, and excessive bending is eliminated. As a result, it is possible to wind the segment iron core piece 13 so that the inner arc of the segment iron core piece 13 coincides with the outer periphery of the drum jig 27.
The coining may be formed after the connecting portion 12 is formed and before winding, and may be formed by using a mold for forming the connecting portion 12 or a different mold. . However, since the coined portion is cured and easily broken during transportation, it is preferable to perform coining immediately before winding.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, coining performed on the outer side or the inner side of the connecting portion in the radial direction changes the situation when the segment core piece is bent at the connecting portion and wound around the drum jig in a spiral manner (that is, during the assembly of the laminated core). However, the state of the laminated core that has been assembled has been investigated in advance to understand the changes in the situation during assembly. Coining may be performed as appropriate.
In the embodiment, the case where the laminated core is a stator laminated core has been described. However, the present invention can also be applied to a case where a laminated rotor core is used.

It is a top view of the laminated iron core which concerns on one embodiment of this invention. It is a partial side view of the laminated core. It is a fragmentary top view which shows the state before lamination | stacking of the segment core piece of the same laminated iron core. It is explanatory drawing of coining in the manufacturing method of the same laminated iron core. It is explanatory drawing of coining in the manufacturing method of the same laminated iron core.

Explanation of symbols

10: laminated iron core, 11: outer peripheral region, 12: connecting portion, 13: segment core piece, 14: side portion, 15: bulging portion, 16: accommodating portion, 17: slot, 18: magnetic pole piece portion, 19: yoke One part, 20: outer recess notch, 21: inner recess notch, 22: radial bulge, 23: tip, 24: recess, 25: protrusion, 26: engagement, 27: drum jig

Claims (4)

A plurality of segment core pieces each having an outer recess notch and an inner recess notch are formed on the outer side and the inner side in the radial direction of the connection portion, and are connected to each other by a connecting portion provided in the outer peripheral region. A method of manufacturing a laminated core in which a piece is bent at the connecting portion and wound around a drum jig in a spiral manner to be laminated,
1) When the segment iron core piece wound with the connecting portion being insufficiently bent interferes with the drum jig, coining on the radially outer side of the connecting portion is performed,
2) When the segment iron core piece wound by excessive bending of the connecting portion and the drum jig interfere with each other, perform coining on the radially inner side of the connecting portion,
A method of manufacturing a laminated core, wherein an inner arc of the segment core piece formed in advance is matched with an outer periphery of the drum jig. 2. The method of manufacturing a laminated core according to claim 1, wherein the coining on the outer side or the inner side in the radial direction of the connecting portion is performed at a plurality of locations along a circumferential direction of the segment core piece. Method. 3. The method of manufacturing a laminated core according to claim 1, wherein an engaging portion configured by a concave portion and a convex portion fitted to the concave portion is provided on a side portion of the adjacent segment core pieces. A method for producing a laminated iron core, wherein A laminated iron core manufactured by the method for producing a laminated iron core according to any one of claims 1 to 3.

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