JP2009131027A - Laminated core and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core in which the bonding strength of adjacent divided laminated cores is strong not only in a circumferential direction but also in a lamination direction and whose shape precision is superior. <P>SOLUTION: An arc-like hole (a) is formed into a divided core piece A on the lowermost layer by communicating with the adjacent divided core piece A; an arc-like connection arm (b) which is extended to an adjacent divided core piece B and is bent/inserted into the arc-like hole (a), formed by communicating with the divided core piece A, and an arc-like hole (c) where the arc-like connection arm (b) is set to one side are formed in the divided core piece B; an arc-like connection arm (d) extending to an adjacent divided core piece C and is bent/inserted into the arc-like hole (c), formed in the divided core piece B and an arc-like hole (e) where the arc-like connection arm (d), is set to one side are formed in the divided core piece C; a dn divided core pieces having the same structures as those of the divided core pieces B and C are laminated alternately. The arc-like connection arms (b) and (d) are set turnable to the arc-like holes (a), (c) and (e) in a lower layer, and they are connected in an uneven stepped manner, into an A-frame shape. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a laminated iron core (for example, a stator laminated iron core) in which an arc-shaped divided laminated iron core, in which a yoke of a laminated iron core is divided for each magnetic pole, is rotatably combined, and a method for manufacturing the same.

A laminated iron core (for example, a stator laminated iron core) constituting the main part of the motor is wound around a magnetic pole formed in the inner diameter direction from the yoke in order to improve the output of the motor and improve efficiency. The windings on the magnetic poles are difficult to work with the stator laminated core because the gap between the magnetic poles is narrow. Moreover, it is difficult to wind with good winding density due to poor winding workability.
As a countermeasure for such a problem, for example, as described in Patent Document 1, the stator laminated iron core is developed, and the yoke piece is divided and punched, and at the circumferential end of the yoke piece, A technique is generally practiced in which a connecting portion composed of a concave portion and a convex portion is formed by punching, and a desired number of the divided core pieces are caulked and laminated, wound around a magnetic pole, and then formed into an annular shape through the laminated concave and convex portions. It has been broken.

This technique has an effect of facilitating winding work around the magnetic poles and improving the winding density. However, since a connecting portion consisting of a concave portion and a convex portion for connecting to the divided yoke portion in a rotatable manner is formed in the mold device, an extra high-precision mold device is required as much as possible. Requires skill.
As another technique, for example, there is one described in Patent Document 2. As shown in FIG. 7, an annular core piece is formed for each magnetic pole by forming arc-shaped protrusions 62 and 63 and arc-shaped notches 64 and 65 on both sides of the yoke piece 61 in the circumferential direction. The divided core pieces 66 are formed by punching. The divided core pieces 66 are caulked and laminated via caulking portions 67 to form divided laminated iron cores 68, and then the laminated magnetic pole portions 69 are wound, and arcuate protrusions 62 and 63, which are laminated, and arcuate shapes, respectively. A laminated iron core 70 is formed by connecting through notches 65 and 64 to form an annular shape.

JP 2005-318863 A JP 2007-60877 A

In the technique described in Patent Document 2, as a result, the laminated cores 68 are connected to each other by the arc-shaped protrusions 62 and 63 and the arc-shaped notches 65 and 64 formed in a plane. Therefore, it cannot be said that the laminated iron core 70 can sufficiently satisfy the strength in the stacking direction of the rotating connecting portion, and there is a problem of further increasing the connecting strength of the rotating connecting portion in the stacking direction.

The present invention was made in view of such circumstances, using a split laminated iron core that is easy to wind, and the joining strength of adjacent divided laminated cores is strong not only in the circumferential direction but also in the stacking direction, An object of the present invention is to provide a laminated iron core having excellent shape accuracy and a method for manufacturing the same.

The laminated core according to the first invention that meets the above-mentioned object comprises a plurality of divided laminated cores obtained by annularly arranging and laminating divided core pieces each having a rotation center at a radially outer end portion at a circumferential end portion of the yoke piece. And the adjacent laminated cores are laminated cores connected so as to be rotatable with respect to the rotation center,
The lowermost divided core piece A is formed with an arc-shaped hole a in communication with the adjacent divided core piece A with respect to the yoke piece of the divided core piece A based on the rotation center.
The split core pieces B stacked on the split core pieces A extend to the adjacent split core pieces B, and are arcuately fitted into arcuate holes a formed in communication with the split core pieces A. A connecting arm b and an arcuate hole c having the arcuate connecting arm b on one side are formed;
The split core piece C stacked on the split core piece B has an arcuate connecting arm d that extends to the adjacent split core piece C and is bent into a circular arc hole c formed in the split core piece B. And an arcuate hole e having the arcuate connecting arm d on one side is formed,
On the upper part of the split core pieces C, split core pieces having the same configuration as the split core pieces B and C are alternately laminated, and the arc-shaped connecting arms b and d are the lower arc-shaped holes a and c. , E is pivotable and connected in a stepped-gap shape.

In the laminated core according to the first aspect, the divided core pieces A, B, and C may be composed of two or three or more divided core pieces having the same shape.
Further, in the laminated core according to the first invention, a notch is formed in a radially outer end of the yoke piece of each of the divided core pieces, and the center of rotation is located in the notch. Is preferred.

According to a second aspect of the present invention, there is provided a method for manufacturing a laminated core, comprising: a plurality of divided core pieces that are divided from a magnetic metal plate in a state of being annularly arranged; A method of manufacturing a laminated core that is rotatably connected with reference to a rotation center at a radially outer end at a circumferential end of a yoke piece of a split core piece,
A first step of forming an arcuate hole a in communication with an adjacent divided core piece A with respect to the center of rotation of the yoke piece of the divided core piece A serving as the lowermost layer;
An arcuate connecting arm b that extends to an adjacent segment core piece B that is stacked on the segment core piece A and that can be bent and fitted into an arcuate hole a formed in the segment core piece A; A second step of forming an arcuate hole c having the arcuate connecting arm b on one side;
An arcuate connecting arm d that extends to the adjacent segment core piece C and that can be bent and fitted into an arcuate hole c formed in the segment core piece B is provided on the segment core piece C stacked on the segment core piece B. A third step of forming an arcuate hole e having the arcuate connecting arm d on one side;
A fourth step of alternately stacking the split core pieces having the same configuration as the split core pieces B and C on the split core pieces C;
The divided core pieces A, B, and C formed in the first to fourth steps are sequentially punched into a mold, and are caulked and stacked via a pre-formed caulking portion, and the arc-shaped connecting arms b and d are lower layers. And a fifth step of manufacturing a laminated iron core that is rotatable and connected to the arcuate holes a, c, e in a step-and-step manner.

In the method for manufacturing a laminated core according to the second invention, the present invention is also applied to the case where the divided core pieces A, B, and C are composed of two or three or more divided core pieces having the same shape.

In the laminated core according to any one of claims 1 to 3, the arc-shaped connecting arms b and d formed on the divided core pieces constituting the adjacent divided laminated cores are circles formed on the divided core pieces at the lower position. Since the arc-shaped holes a, c, and e are bent and fitted, adjacent divided laminated cores are firmly connected in the horizontal direction and are also firmly connected in the vertical direction. As a result, a laminated iron core with good shape accuracy is obtained.
The adjacent divided laminated cores rotate with reference to the rotation center formed radially outward at the circumferential end of the yoke piece, so that the shape accuracy is excellent both before and after the rotation, and to the magnetic pole part. Winding is easy.

And the laminated core manufactured in the manufacturing method of the laminated core of Claim 4, 5 has the effect of the laminated core described above, In the manufacturing method, the said laminated core is used for a mold apparatus. Can be manufactured continuously and efficiently.

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 perspective view of a laminated iron core according to an embodiment of the present invention, FIG. 2 is a detailed sectional view of a connecting portion of adjacent laminated iron cores of the laminated iron core, and FIGS. Is a detailed explanatory view of the connecting portion of the laminated core, FIGS. 4A to 4C are explanatory views of each divided core piece, and FIG. 5 is an explanatory view of the method of manufacturing the laminated core according to one embodiment of the present invention. 6A and 6B are partial explanatory views of the manufacturing method.

First, a (stator) laminated iron core 10 according to an embodiment of the present invention shown in FIGS. 1 to 3 will be described. As shown in FIG. 1, the laminated iron core 10 has six divided laminated iron cores 12 divided for each magnetic pole 11 and two divided laminated iron cores 13 and 14. Each of the divided laminated cores 12 to 14 is rotatably connected via a connecting portion 15, and the divided laminated iron cores 13 and 14 are connected via a triangular concave portion 16 and a convex portion 17 in plan view, and the outer periphery is flat. The laminated iron core 10 having a circular shape as viewed and having a rotor space 18 inside is formed.

Each of the divided laminated cores 12 to 14 is formed by caulking laminated core pieces 19 to 21 obtained by dividing an annular stator core piece for each magnetic pole through a caulking portion 23 to a desired height. The connecting portions 15 that rotatably connect the adjacent divided laminated cores 12 to 14 are formed on both sides in the circumferential direction of the yoke pieces 24 of the adjacent divided core pieces 19 to 21, and will be described in detail below. .

As shown in FIG. 3A, the lowermost divided core piece A among the divided core pieces 19 communicates with the yoke piece 24 of the divided core piece A adjacent to the divided core piece A and has the same radius and the same width. An arcuate hole a is formed. The arcuate hole a has a central angle of, for example, 60 to 120 degrees and is formed symmetrically, and the center of the arc is formed in the notch 25 on the outer side in the radial direction of the abutting end of the adjacent divided core piece A. Is formed. In this embodiment, the center of the arc is the end of the split core piece A that is in contact with the outer periphery of the yoke piece 24, and the center of this arc is the rotation center 26 of the adjacent split laminated core 12. Yes. The rotation center 26 includes divided core pieces 19 to 21 that are caulked and laminated thereon, divided laminated cores 12 formed by laminating them, and a divided laminated core 13 that is connected to the divided laminated core 12. , 14 are also formed at the same position.

In FIG. 3 (A), when the curvature radii of the outer side and the inner side of the arc-shaped hole a are r1 and r2, as shown in FIG. 3 (B), the divided core pieces 19 are caulked and stacked on the divided core pieces A. 20, 21, a circular arc-shaped connecting arm b is formed by punching from the one divided core piece B in contact with the other divided core piece B in the clockwise direction. The arc-shaped connecting arm b has outer and inner curvature radii r1 and r2 around the rotation center 26, respectively, and has the same curvature radius and width as the arc-shaped hole a of the lower divided core piece A. As shown in FIG. 3C, the tip of the arc-shaped connecting arm b is bent and inserted into the arc-shaped hole a.

In forming this arc-shaped connecting arm b, continuous U-shaped slots 28 are formed on the inner side and the outer side in the radial direction and on the front side thereof. In particular, an arc-shaped hole c having an inner radius of curvature r3 and an outer radius of curvature r2 is formed across the adjacent divided core pieces B on the radially inner side of the arc-shaped connecting arm b. That is, the arc-shaped hole c has the inner side of the arc-shaped connecting arm b as one side. Here, there is a relationship of r1-r2 = r2-r3, and the arc-shaped hole c is the same as the width of the arc-shaped hole a. By forming the slot 28, an arcuate hole f is formed inside and outside the arcuate connecting arm b in addition to the arcuate hole c. The width of the arcuate hole f is also the same as that of the arcuate hole c. It should be the same. The arc-shaped connecting arm b has a free end on one side, and the free end is pushed and bent to the lower layer side.

As shown in FIG. 3 (D), a split core piece C (which constitutes split core pieces 19 to 21) is caulked and laminated on the two split core pieces B. An arc-shaped connecting arm d is formed in the part from the other divided core piece C toward one divided core piece C. The arc-shaped connecting arm d has an outer radius of curvature of r2 and an inner radius of curvature of r3. As shown in FIG. 3E, the arc-shaped connecting arm d has a free end on the other side, and the second divided It is bent into a circular arc hole c formed in the iron core piece B.

Of the continuous U-shaped slots 29 formed on the radially inner side and the outer side of the arc-shaped connecting arm d and on the front side thereof, the portion located on the radially outer side has an inner radius of curvature r2 and an outer radius of curvature. An arcuate hole e of r1 is formed. The arc-shaped hole e formed in the divided core piece C is formed with the outer side of the arc-shaped connecting arm d as one side, and when viewed in plan, is the same as the arc-shaped hole a formed in the divided core piece A. Become. Further, by forming the U-shaped slot 29, the arc-shaped hole g is formed inside and outside of the arc-shaped connecting arm d in addition to the arc-shaped hole e. The width of the arc-shaped hole g is also circular. It may be the same as the arc-shaped hole e.

Accordingly, the split core pieces D stacked on the split core pieces C have the same shape as the split core pieces B, the split core pieces E stacked on the split core pieces D have the same shape as the split core pieces C, and thereafter the split cores. By alternately stacking the split core pieces having the same shape as the pieces B and the split core pieces C, the arc-shaped connecting arms b and d can be rotated to the lower arc-shaped holes a, c, and e and connected in a stepped-gap shape. Then, the laminated iron core 10 connected by the rotatable connecting portion 15 is completed.

In addition, the recessed part 16 and the convex part 17 are each formed in the clockwise direction edge part of the division | segmentation laminated | stacked iron core 14, and the counterclockwise direction edge part of the division | segmentation iron core piece 13, respectively, and each division | segmentation lamination | stacking iron core 12-14 is formed. Is rotated by the connecting portion 15, and the laminated core 10 having an annular shape is opened by the concave portion 16 and the convex portion 17, so that the shape can be made linear or nearly linear.
In addition, as it is applied also to a well-known laminated core, the caulking part 23 of the lowermost divided core piece A becomes a caulking through hole, and all the divided core pieces on the upper half are caulked (or V-shaped caulking). It has become.

FIG. 2 shows a part of the laminated core 10 assembled in this manner. The divided core piece A is arranged in the lowermost layer, the divided core piece B is arranged in the second layer, and the divided core piece C is arranged in the third layer. ing. Furthermore, since the divided core pieces B and the divided core pieces C are alternately laminated, the same reference numerals are used.

Then, the structure of the laminated core 10 demonstrated with reference to FIGS. 1-3 and the manufacturing method of the laminated core which concerns on one embodiment of this invention are demonstrated, referring FIGS. 4-6.
In this embodiment, a laminated iron core (fixed laminated iron core) 10 is manufactured from a magnetic metal plate 30 having a thickness of 0.2 to 0.5 mm, for example, through processing (steps) from station 1 to station 13.

A circular hole 33 is punched at a station 1 at a predetermined position (the center in the width direction) of the magnetic metal plate 30 in which pilot holes 31 and 32 are previously formed at a predetermined pitch. The extracted disk is preferably pressed in advance and used as a rotor (rotor).
Next, in the station 2, the arc-shaped holes a of the divided core pieces A arranged in the annular shape at the lowermost part are formed (see FIGS. 3A and 4C). For the other divided core pieces, the station 2 is an idle station.

In the station 3, a U-shaped slot 28 is formed in the second and subsequent even-numbered divided core pieces B to form an arc-shaped connecting arm b (see FIG. 3B). Station 3 is an idle station for odd-numbered divided core pieces A and C.
The station 4 forms an arc-shaped connecting arm d by punching a U-shaped slot 29 in the third and subsequent odd-numbered divided core pieces C (see FIG. 3D). The station 4 is an idle station for the divided core pieces A and the even-numbered divided core pieces B.

In the station 5, as shown in FIGS. 4 (A) to 4 (C), dividing lines 34, 35, which divide adjacent divided core pieces A, B, C, for each divided core pieces A, B, C. Slotting is performed to form a U-shaped notch 25 formed radially outside 36. The length of the slot in the radial direction is preferably about 4 to 8 times the thickness of the magnetic metal plate 30.

In the station 6, the slot 38 for forming the magnetic pole piece 37 is punched out of all the divided core pieces A, B, C (slot removal). The station 7 performs bending processing of the already formed arc-shaped connecting arm b for the even-numbered divided core pieces B. The bending depth is sufficient if the arc-shaped connecting arm b can be fitted into the arc-shaped holes a and e of the divided core pieces A and C in the lower layer (see FIG. 3C). The bending position is preferably a portion from the base portion to the middle portion of the arc-shaped connecting arm b. Station 7 is an idle station for odd-numbered divided core pieces A and C.

In the station 8, the arcuate connecting arm d is bent for the third and subsequent divided core pieces C (see FIG. 3E). The bending depth and the bending position are the same as those of the arc-shaped connecting arm b. The station 8 is an idle station for the first divided core piece A and the second and subsequent even-numbered divided core pieces B.

In the station 9, formation of the dividing line 34 (see FIGS. 3A and 4C) between the divided core pieces A with respect to the first divided core piece A at the bottom, that is, cutting and bending processing. I do. As shown in FIGS. 6 (A) and 6 (B), this cutting and bending process uses a movable blade 41 having a cutting angle α with a fixed blade 40 and a bottom surface of 70 to 80 degrees, and the movable blade 41 is made of a magnetic metal plate. It is performed by lowering from the upper surface of 30 to, for example, about 1.2 to 2 times the plate thickness (indicated by h) (the same applies to the following cutting and bending processes).

Thereby, the division | segmentation of the adjacent division | segmentation iron core piece A can be performed suppressing the deformation | transformation to the magnetic metal plate 30 to the minimum. That is, the separated divided core pieces A can be separated while keeping the separated divided core pieces A in a flat shape. In addition, about the parting line of the part which connects the division | segmentation iron core pieces 20 and 21, as shown in FIG. 1, the convex part 17 and the recessed part 16 are formed. The formation of the convex portions 17 and the concave portions 16 is common to the following divided core pieces B and C.

In the station 10, for the even-numbered divided core pieces B, the dividing lines 35 shown in FIG. 4B are formed by cutting and bending. This station 10 is an idle station for odd-numbered divided core pieces A and C.

The station 11 performs the formation of the dividing line 36 shown in FIG. 4A on the odd-numbered divided core pieces C after the third by cutting and bending. The station 11 is an idle station for the first divided core piece A and the even-numbered divided core piece B.

The station 12 forms the caulking portion 23 for each of the divided core pieces A, B, and C. However, for the split core piece A, the caulking portion 23 is a caulking through hole, and the other split core pieces B and C are half-cut caulking (or V-shaped caulking). As is well known, the formation of the caulking through hole and the half punching caulking is performed by adjusting the protruding length of the punch with respect to the die.

At the station 13, the outer shape of the split core pieces A, B, and C arranged in a ring shape is removed, and all the split core pieces A, B, and C are sequentially caulked and stacked in a die (die) to form a laminated core 10. To do. In this case, the first pressing protrusion that pushes the arc-shaped connecting arm b of the divided core piece B into the arc-shaped holes a and e in the lower layer and the arc-shaped connecting arm d of the split core piece C are pushed into the arc-shaped hole c. It is preferable to provide the second pressing protrusion on the punch used at the station 13. Of course, the first and second pressing protrusions are provided with a lifting mechanism that protrudes only when necessary.

In the above embodiment, the case where the number of magnetic poles is eight has been described. However, the present invention can be applied to other numbers of magnetic poles. In the embodiment, each of the divided core pieces A, B, and C is a single divided core piece, but may be two or three or more. In this case, in the method of manufacturing the laminated core, the divided core pieces A, B, and C are continuously manufactured in the stations 1 to 13 by the required number. In forming the caulking portion of the lowermost divided core piece A, only the divided core piece A positioned at the bottom is used as a caulking through hole, and the other divided core pieces A are used as caulking projections.

It is a perspective view of the laminated iron core which concerns on one embodiment of this invention. It is detail sectional drawing of the connection part of the division | segmentation laminated | stacked iron core adjacent to the same laminated iron core. (A)-(E) are detailed explanatory drawings of the connection part of the laminated iron core. (A)-(C) are explanatory drawings of each division | segmentation iron core piece. It is explanatory drawing of the manufacturing method of the laminated core which concerns on one embodiment of this invention. (A), (B) is a partial explanatory view of the manufacturing method. (A), (B) is the perspective view of the laminated iron core which concerns on a prior art example, and explanatory drawing of a division | segmentation iron core piece.

Explanation of symbols

10: laminated iron core, 11: magnetic pole, 12-14: divided laminated iron core, 15: connecting portion, 16: recessed portion, 17: convex portion, 18: rotor space, 19-22: divided core piece, 23: caulking portion, 24 : York piece, 25: Notch, 26: Center of rotation, 28, 29: Slot, A to C: Divided core pieces, a, c, e, f, g: Arc hole, b, d: Arc connection Arm, 30: Magnetic metal plate, 31, 32: Pilot hole, 33: Circular hole, 34-36: Dividing line, 37: Magnetic pole piece, 38: Slot, 40: Fixed blade, 41: Movable blade

Claims (5)

A plurality of divided laminated cores are formed by annularly arranging and laminating divided core pieces each having a rotation center at a radially outer end at a circumferential end of the yoke piece, and the adjacent divided laminated cores are adjacent to the rotation center. Is a laminated iron core that is pivotally connected with respect to
The lowermost divided core piece A is formed with an arc-shaped hole a in communication with the adjacent divided core piece A with respect to the yoke piece of the divided core piece A based on the rotation center.
The split core pieces B stacked on the split core pieces A extend to the adjacent split core pieces B, and are arcuately fitted into arcuate holes a formed in communication with the split core pieces A. A connecting arm b and an arcuate hole c having the arcuate connecting arm b on one side are formed;
The split core piece C stacked on the split core piece B has an arcuate connecting arm d that extends to the adjacent split core piece C and is bent into a circular arc hole c formed in the split core piece B. And an arcuate hole e having the arcuate connecting arm d on one side is formed,
On the upper part of the split core pieces C, split core pieces having the same configuration as the split core pieces B and C are alternately laminated, and the arc-shaped connecting arms b and d are the lower arc-shaped holes a and c. The laminated iron core is characterized in that it can be pivoted to e, and is connected in a stepped-gap shape. 2. The laminated core according to claim 1, wherein each of the divided core pieces A, B, and C includes two or three or more divided core pieces having the same shape. 3. The laminated core according to claim 1, wherein a notch is formed at a radially outer end of the yoke piece of each of the divided core pieces, and the rotation is inserted into the notch. A laminated iron core characterized by a dynamic center. A plurality of divided core pieces divided from a magnetic metal plate are stamped and formed in a ring shape, and a divided laminated core obtained by stacking the respective divided core pieces has a radius at a circumferential end of the yoke piece of each divided core piece. It is a manufacturing method of a laminated iron core that is connected so as to be rotatable with respect to a rotation center at a direction outer end,
A first step of forming an arcuate hole a in communication with an adjacent divided core piece A with respect to the center of rotation of the yoke piece of the divided core piece A serving as the lowermost layer;
An arcuate connecting arm b that extends to an adjacent segment core piece B that is stacked on the segment core piece A and that can be bent and fitted into an arcuate hole a formed in the segment core piece A; A second step of forming an arcuate hole c having the arcuate connecting arm b on one side;
An arcuate connecting arm d that extends to the adjacent segment core piece C and that can be bent and fitted into an arcuate hole c formed in the segment core piece B is provided on the segment core piece C stacked on the segment core piece B. A third step of forming an arcuate hole e having the arcuate connecting arm d on one side;
A fourth step of alternately stacking the split core pieces having the same configuration as the split core pieces B and C on the split core pieces C;
The divided core pieces A, B, and C formed in the first to fourth steps are sequentially punched into a mold, and are caulked and stacked via a pre-formed caulking portion, and the arc-shaped connecting arms b and d are lower layers. And a fifth step of manufacturing a laminated iron core that is rotatable and connected to the arcuate holes a, c, e in a stepped-gap shape. 5. The method for manufacturing a laminated core according to claim 4, wherein each of the divided core pieces A, B, and C includes two or three or more divided core pieces having the same shape.

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