JP2007143258A - Laminated iron core and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated iron core and its manufacturing method for stabilizing a folding position of a connection, suppressing a swelling of the connection in the thickness direction, and efficiently manufacturing high quality products. <P>SOLUTION: In the laminated iron core 10, segment iron core pieces 13 are mutually coupled by the connection 12 on an outer circumference 11, side ends 14 of the segment iron core pieces 13 are aligned by folding the connection 12, a plurality of the continuous segment iron core pieces 13 are spirally wound and laminated. The laminated iron core 10 is provided with a recess notch 20 for accommodating a swelling 19 radially and outwardly formed within an outer circle of the laminated iron core 10 when the connection 12 is radially and outwardly folded, a notch 15 radially disposed within the connection 12 and determining a folding width W1 and the folding position P of the connection 12, and an abutment preventing notch 21 coupled to the notch 15 and preventing the side ends 14 of the adjacent segment iron core pieces 13 from abutting in a radial outer region. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

Conventionally, as a method for improving the yield of iron core materials (for example, strips) used in the manufacture of laminated iron cores, when punching iron core pieces from iron core material, a plurality of segment core pieces that are continuous in a strip shape are formed by punching. A so-called wound iron core is known in which a laminated iron core is manufactured by laminating this while being wound.
Specifically, arc-shaped segment core pieces having a predetermined number of slots are punched out of the core material with a die in a state where the pieces are connected to each other via a connecting portion. And the connection part formed in the outer peripheral side is bend | folded, the continuous several segment core piece is wound spirally and laminated | stacked, aligning the side edge part of an adjacent segment core piece. An arc-shaped notch 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 Literature 1, Patent Literature 2, and Patent Literature 3).

Japanese Patent Laid-Open No. 1-264548 JP-A-8-196061 JP-T-2004-505595

However, the width (radial length) of the connecting portions of adjacent segment core pieces is almost the same, and there is no significant difference in the strength. Therefore, the bending start point of the connecting portion is always formed at the same position of the connecting portion. It is not always stable and is not stable. For this reason, the annular accuracy of a plurality of wound segment core pieces deteriorates, and it becomes impossible to stack while accurately aligning the segment core pieces adjacent to each other in the vertical direction, and the efficiency of the motor using the laminated core is reduced. It was not possible to improve than the current situation.
Further, when the connecting portion is bent, the connecting portion swells in the thickness direction, which causes a gap between the laminated segment core pieces, resulting in variations in the thickness of the manufactured laminated core. As a result, vibration is likely to occur in a motor using a laminated iron core, and the quality of the motor could not be improved compared to the current situation.

The present invention has been made in view of such circumstances, and stabilizes the bending position of the connecting portion, and suppresses the bulging of the connecting portion in the thickness direction as compared with the conventional one, and manufactures a product with high efficiency and high quality. An object of the present invention is to provide a possible laminated iron core and a method for producing the same.

In the laminated core according to the first aspect of the present invention, the adjacent segment core pieces connected to each other by the connecting portions formed on the outer peripheral portion are bent, and the side ends of the segment core pieces are bent by bending the connecting portions. In the laminated iron core in which the plurality of continuous segment iron core pieces are spirally wound and laminated together,
On the outer side in the radial direction of the connecting part, there is a recess notch for accommodating a bulging part formed on the outer side in the radial direction when the connecting part is bent, in the outer circle of the laminated iron core,
A connecting portion inner notch that determines a bending width and a bending position of the connecting portion is provided on the radially inner side of the connecting portion, and is connected to the inner notch of the connecting portion, respectively, so that the segment core pieces adjacent to each other are radially outward. A notch for preventing contact is provided to prevent contact of the side end of the segment core piece in the region.

In the laminated core according to the first aspect of the present invention, it is preferable that a radial length of the connecting portion inner notch is shorter than a radial length of the contact prevention notch.
In the laminated iron core according to the first invention, the inner notch of the connecting portion before bending of the connecting portion is substantially arc-shaped, and the inner width thereof becomes narrower toward the radially outer side of the connecting portion, It is preferable that the folding position is formed in the innermost part.

In the laminated iron core according to the first aspect of the present invention, it is preferable that the connecting portion inner notch and the contact prevention notch form a continuous gap.
In the laminated iron core according to the first aspect of the present invention, it is preferable that an engaging portion constituted by a concave portion and a convex portion that can be fitted to the side portion of the adjacent segment core piece is provided.
In the laminated core according to the first invention, it is preferable that side end portions of the adjacent segment core pieces are arranged close to each other.

The method for manufacturing a laminated core according to the second invention in accordance with the above object comprises forming a plurality of segment core pieces joined together at a connecting portion formed on an outer peripheral portion, and bending the connecting portion to adjoin the segments. In the method of manufacturing a laminated core in which the plurality of continuous segment core pieces are spirally wound and laminated while matching the side end portions of the core pieces,
When forming the segment core pieces, a recess notch is formed on the outer side in the radial direction of the connecting portion so that a bulging portion formed on the outer side in the radial direction when the connecting portion is bent is contained in the outer circle of the laminated core. Process,
B step of forming a connecting portion inner notch for determining a bending width and a bending position of the connecting portion on the radially inner side of the connecting portion;
C process which forms the notch for a contact prevention which connects with the said connection part inner side notch respectively, and prevents the contact of the side edge part of the said segment core piece in the radial direction outer side area | region of the said adjacent segment core piece. And do.

Since the laminated iron core according to any one of claims 1 to 6 and the laminated iron core manufacturing method according to claim 7 are provided with a connecting portion inner notch that determines a bending width and a bending position in the connecting portion, the starting position of the bending is stable, The annular accuracy of the plurality of wound segment core pieces can be improved as compared with the conventional one, and the segment core pieces adjacent in the vertical direction can be stacked while being accurately aligned.
Moreover, since it has a connection part inner side notch, the swelling of the thickness direction which generate | occur | produces when bending a connection part can be suppressed.
And since it has a notch for contact prevention continuous with the notch on the inner side of the connecting part, the variation in the circumferential pitch of each segment core piece due to the contact of the side end part of the adjacent segment core pieces, and the side end Swelling of the part can be suppressed.
As a result, quality control of the laminated iron core is facilitated, the efficiency of the motor using the laminated iron core can be improved, and the motor quality can be improved by preventing the occurrence of vibration.

In particular, since the laminated iron core according to claim 2 makes the length of the notch on the inner side of the connecting portion shorter than the length of the notch for preventing contact, the size of the inner notch on the connecting portion provided in the connecting portion can be reduced, The strength reduction of the connecting portion due to the formation of the connecting portion inner notch can be suppressed.
In the laminated iron core according to the third aspect, by defining the shape of the connecting portion inner notch before the connecting portion is bent, the bending position can be formed more stably.
The laminated iron core according to claim 4 forms a gap in which the inner notch of the connecting portion and the notch for preventing contact are continuous, so that a bulge in the thickness direction that occurs when the connecting portion is bent, an adjacent segment core piece It is possible to further suppress the variation in the pitch in the circumferential direction of each segment core piece due to the contact of the side end portion and the rise of the side end portion.

In the laminated core according to claim 5, since the engaging portion is provided on the side portion of the adjacent segment core pieces, the mutual displacement of the adjacent segment core pieces constituting the laminated core can be prevented. Even when the laminated core rotates at high speed, the annular accuracy (roundness) can be maintained.
The laminated iron core according to claim 6 is arranged adjacent to the side end portions of the adjacent segment core pieces, so that contact between the side end portions can be prevented, so that variation in the circumferential pitch of each segment core piece can be prevented, For example, the displacement of the caulking position of the segment core pieces in the stacking direction can be prevented. In addition, by arranging them close in this way, for example, even when a die blade for punching a segment core piece wears out and burrs are generated at the side end, the contact can be prevented, and the circumference of each segment core piece can be prevented. It is possible to prevent the deviation of the direction pitch.

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 sectional view of a laminated core according to an embodiment of the present invention, and FIG. 2 is a partial plan view showing a state before the segment core pieces of the laminated core are laminated.

As shown in FIG. 1 and FIG. 2, a laminated core 10 according to an embodiment of the present invention includes adjacent segment core pieces 13 connected to each other by connecting portions 12 formed on the outer peripheral portion 11. 12 is a stator laminated iron core (also referred to as a stator) in which a plurality of continuous segment iron core pieces 13 are spirally wound and laminated while the side end portions 14 of the segment iron core pieces 13 are bent to match each other. By providing the connecting portion inner notch 15 that determines the bending width W1 and the bending position P, the bending position P of the connecting portion 12 is stabilized, and the bulging in the thickness direction of the connecting portion 12 is suppressed more than before. It is. This will be described in detail below.

The laminated core 10 has a thickness of, for example, an electromagnetic steel sheet (not shown) having a thickness of about 0.5 mm or less, and a plurality of segment core pieces 13 joined by the connecting portion 12 are punched with a mold, as shown in FIG. A continuous segment core piece 13 punched out is wound and sequentially caulked and laminated. In addition, FIG. 1 has shown the state which wound the segment iron core piece 13 for one round and a half, and laminated | stacked the half circumference for convenience of explanation. Here, as a method of laminating a plurality of segment core pieces, any one of caulking, welding, and adhesion can be applied, or any two or more can be used in combination.
Each segment core piece 13 is provided with a plurality of slots 16 on the inner side in the radial direction to form a magnetic pole piece portion 17 and on the outer side in the radial direction, a yoke piece portion 18 is formed.

Between adjacent segment core pieces 13, a connecting portion 12 that connects the segment core pieces 13 at the outer peripheral portion 11 is provided.
On the outer side in the radial direction of the connecting part 12, there is provided a recess notch 20 for accommodating the bulging part 19 formed on the outer side in the radial direction when the connecting part 12 is bent in the outer circle of the laminated core 10. For this reason, as shown in FIG. 2, before bending, the outer periphery of the connecting portion 12 is recessed radially inward.
As shown in FIG. 2, a connecting portion inner notch 15 in which the shape before bending of the connecting portion 12 is substantially arcuate is provided on the inner side in the radial direction of the connecting portion 12. A substantially arc-shaped notch 21 for preventing contact is connected to the notch 15.

The inner width of the inner notch 15 of the connecting portion 12 before bending of the connecting portion 12 gradually decreases toward the radially outer side of the connecting portion 12, and a bending position P is formed at the innermost portion. Therefore, the shape of the inner notch of the connecting portion may be, for example, an inverted U shape or an inverted V shape in plan view.
As shown in FIG. 1, the length L1 in the radial direction of the connecting portion inner notch 15 after bending of the connecting portion 12, that is, the length L1 from the bending position P to the connection portion with the notch 21 for preventing contact is as follows. The minimum width W1 of the connecting portion 12 (see the enlarged portion in FIG. 1) is, for example, about 5% to 30%. In addition, the minimum width W1 of the connection part 12 is about 0.5 mm or more and 5 mm or less, for example.
The length L1 of the connecting portion inner notch 15 is shorter than the radial length L2 of the contact prevention notch 21 and is, for example, 5% or more of the length L2 of the contact prevention notch 21. It is about 30% or less.

As shown in FIG. 1, the notch 21 for preventing contact that is continuous with the inner notch 15 of the connecting portion is in contact with the side end portion 14 of the segment core piece 13 in the radially outer region of the adjacent segment core pieces 13. Is to prevent. For this reason, after the connecting portion 12 is bent, a gap is formed by the two notch 21 for preventing contact. If this condition is satisfied, the shape of the notch for preventing contact is not limited to an arc shape.
Thereby, the connection part inner side notch 15 and the contact prevention notch 21 can form a continuous gap when the connection part 12 is bent and the side end parts 14 of the adjacent segment core pieces 13 are joined.

By configuring as described above, the connecting portion inner notch 15 provided in the connecting portion 12 can give a good hinge effect to the connecting portion 12 when the connecting portion 12 is bent.
Further, when the connecting portion 12 is bent, the outer peripheral portion of the connecting portion 12 is pulled in the circumferential direction, and the thickness is reduced and the bulging portion 19 is formed on the radially outer side. There is no problem because it is disposed within the area 20. On the other hand, the inner peripheral portion of the connecting portion 12 is compressed in the circumferential direction and bulges in the thickness direction, but since this is alleviated by the inner notch 15 of the connecting portion, the bulge can be suppressed more than in the past. .
In addition, an engaging portion 24 configured by a concave portion 22 and a convex portion 23 that can be fitted to the concave portion 22 is provided in a radially inner region of the side end portion 14 of the adjacent segment core pieces 13. The side end portions 14 of the adjacent segment core pieces 13 including the concave portion 22 and the convex portion 23 are arranged close to each other with a gap therebetween, but may be brought into contact with each other.
Thereby, the mutual positioning of the adjacent segment core pieces 13 can be implemented with higher accuracy, and the annular accuracy can be improved.

As shown in FIG. 1, when winding and laminating a plurality of segment core pieces 13, the connecting portions 12 provided between the adjacent segment core pieces 13 are shifted to different positions in the lamination direction, and each pole piece The position of the part 18 is matched. In FIG. 1, when the segment core pieces 13 are stacked, they are displaced in the circumferential direction in the stacking direction by one slot.
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, only one slot is required. When the number of segment core pieces per round necessary for shifting in the stacking direction is k, the following relationship is established.
(M + 1) / n = k
Here, m, n, and k are positive integers, respectively, 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 as shown in FIG. The number of segment core pieces required for one turn from the above formula is 7 (k = 7) because the number of slots (corresponding to 3 slots: n = 3), but the magnetic pole of the seventh segment core piece is Only one piece is the next layer when stacked, and the position of the connecting portion in the stacking direction is shifted by one pole piece (corresponding to one slot).
Further, when the number of slots shifted in the circumferential direction in the stacking direction is set to two or more, the number of segment core pieces required for one round is changed by changing “1” in the above formula to a shifted number, that is, two or more. Is obtained.
Thus, when the plurality of segment core pieces 13 are wound and stacked, the position of the connecting portion 12 is shifted in the circumferential direction in the stacking direction, so that the coupling strength of each segment core piece 13 can be further strengthened.

Then, the manufacturing method of the laminated core which concerns on one embodiment of this invention is demonstrated.
First, as shown in FIG. 2, a plurality of segment core pieces 13 connected to each other at a connecting portion 12 using one or a plurality of dies (not shown) while conveying an electromagnetic steel sheet (not shown). Punch through.
When the segment core piece 13 is punched, the process A for forming the recess notch 20, the process B for forming the connecting portion inner notch 15, and the notch 21 for preventing contact are formed after the punching of the normal slot 16. Step C is formed. Depending on the mold shape, each of the A to C steps can be performed simultaneously, individually, or by changing the order, and can be performed together with the punching of the slot 16. .
Then, the connecting portion 12 is bent starting from the bending position P of the connecting portion inner notch 15, the convex portion 23 is fitted in the concave portion 22 of the adjacent segment core piece 13, and the side end portion 14 of the segment core piece 13 is While aligning, a plurality of continuous segment core pieces 13 are spirally wound and laminated to produce a laminated core 10.

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included. For example, the case where the laminated core of the present invention and the manufacturing method thereof are configured by combining some or all of the above-described embodiments and modifications are also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the case where the laminated iron core was a stator laminated iron core was demonstrated, of course, a rotor laminated iron core (it is also called a rotor) may be sufficient.

It is a plane sectional view of the lamination iron core concerning one embodiment of the present invention. It is a fragmentary top view which shows the state before lamination | stacking of the segment core piece of the same laminated iron core.

Explanation of symbols

10: laminated iron core, 11: outer peripheral portion, 12: connecting portion, 13: segment core piece, 14: side end portion, 15: notch on inner side of connecting portion, 16: slot, 17: magnetic pole piece portion, 18: yoke piece portion , 19: bulging portion, 20: notch for recess, 21: notch for preventing contact, 22: recess, 23: protrusion, 24: engagement portion

Claims (7)

The adjacent segment core pieces joined to each other at the connecting portion formed on the outer peripheral portion are spirally connected to each other while the connecting portions are bent and the side end portions of the segment core pieces are aligned. In the laminated iron core wound and laminated in a shape,
On the outer side in the radial direction of the connecting part, there is a recess notch for accommodating a bulging part formed on the outer side in the radial direction when the connecting part is bent, in the outer circle of the laminated iron core,
A connecting portion inner notch that determines a bending width and a bending position of the connecting portion is provided on the radially inner side of the connecting portion, and is connected to the inner notch of the connecting portion, respectively, so that the segment core pieces adjacent to each other are radially outward. A laminated core having a contact prevention notch for preventing contact of a side end portion of the segment core piece in the region. 2. The laminated core according to claim 1, wherein a radial length of the inner notch of the connecting portion is shorter than a radial length of the notch for preventing contact. 3. 3. The laminated core according to claim 1, wherein the connection part inner notch before bending of the connection part is substantially arc-shaped, and an inner width thereof is a radial direction of the connection part. A laminated iron core characterized in that it is narrowed toward the outside and the bending position is formed at the innermost part thereof. The laminated core according to any one of claims 1 to 3, wherein the connecting portion inner notch and the contact-preventing notch form a continuous gap. The laminated iron core according to any one of claims 1 to 4, wherein a side portion of the adjacent segment core pieces is provided with an engaging portion configured by a concave portion and a convex portion that can be fitted to the concave portion. A laminated iron core characterized by The laminated core according to any one of claims 1 to 5, wherein the side end portions of the adjacent segment core pieces are arranged close to each other. A plurality of continuous segment segments are formed by forming a plurality of segment core pieces joined together at a connecting portion formed on an outer peripheral portion, and bending the connecting portion to align side end portions of the adjacent segment core pieces. In the manufacturing method of the laminated core in which the core pieces are spirally wound and laminated,
When forming the segment core pieces, a recess notch is formed on the outer side in the radial direction of the connecting portion so that a bulging portion formed on the outer side in the radial direction when the connecting portion is bent is contained in the outer circle of the laminated core. Process,
B step of forming a connecting portion inner notch for determining a bending width and a bending position of the connecting portion on the radially inner side of the connecting portion;
C process which forms the notch for a contact prevention which connects with the said connection part inner side notch respectively, and prevents the contact of the side edge part of the said segment core piece in the radial direction outer side area | region of the said adjacent segment core piece. The manufacturing method of the laminated iron core characterized by performing these.

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