JP6510157B1 - Laminated core - Google Patents

Abstract

An object of the present invention is to improve the bonding strength between a large diameter core block and a small diameter core block in a laminated core having a large diameter core block and a small diameter core block. A large diameter core block 14 formed by laminating a plurality of first iron core thin plates 12 having a first outer diameter D1, and a second outer diameter D2 smaller than the first outer diameter D1. A laminated core 10 configured by laminating a plurality of small core blocks 18 formed by laminating a plurality of second core thin plates 16 with each other, the large diameter core block 14 on the side facing the small core blocks 18 The recess 28 is formed in the vicinity of the outer periphery of the small diameter core block 18 of the shoulder surface 14B to be formed, and the laminating direction is extended from the outer peripheral surface 18A of the small diameter core block 18 to the inner surface 28A of the recess 28 formed in the large diameter core block 14 A connecting weld 32 is provided which extends continuously. [Selected figure] Figure 3

Description

  The present invention relates to a laminated core, and more particularly to a laminated core used for a rotating electrical machine or the like.

  As a laminated core used for a rotor or a stator of a rotating electrical machine, a welded portion is formed by laminating a plurality of iron core thin plates made of electromagnetic steel plates etc. continuously extending the outer peripheral surface of the plurality of iron core thin plates in the laminating direction. DESCRIPTION OF RELATED ART It has and the laminated core to which the said thin plate for iron cores was mutually joined by the said welding part is known (for example, patent documents 1-3).

Patent No. 5126414 Patent No. 5278551 Patent No. 5299514

  A large diameter core block formed by laminating a plurality of first thin sheets for iron core having a first outer diameter and mutually bonding them as a laminated core for a rotary electric machine, and a second smaller than the first outer diameter A laminated core configured by laminating together a plurality of second iron core thin plates having an outer diameter of 4 and a small diameter core block formed by mutually laminating the laminated layers is considered.

  In such a laminated core, when an external force is applied in the lamination direction of the thin plates for iron core, stress may be concentrated at the boundary between the large diameter core block and the small diameter core block, and peeling or cracking may occur.

  When the large diameter core block and the small diameter core block are joined by welding extending in the laminating direction of the outer peripheral surface of each thin core sheet, the defect at the boundary between the large diameter core block and the small diameter core block This is particularly likely to occur when the welding strength is insufficient and the bonding strength between the large diameter core block and the small diameter core block can not be sufficiently secured.

  The problem to be solved by the present invention is to improve the bonding strength between a large diameter core block and a small diameter core block in a laminated core having a large diameter core block and a small diameter core block.

  A laminated core (10) according to one embodiment of the present invention is a large diameter core block formed by laminating a plurality of first thin sheets for iron core (12) having a first outer diameter (D1) with each other and connecting them together. A small diameter core formed by laminating (14) and a plurality of second iron core thin plates (16) having a second outer diameter (D2) smaller than the first outer diameter (D1) and mutually connecting them. A laminated core (10) in which the block (18) and the block (18) are laminated to each other, of the shoulder surface (14B) formed on the side of the large diameter core block (14) facing the small diameter core block (18) The recess (28) is formed in the vicinity of the outer periphery of the small diameter core block (18), and the recess (28) formed in the large diameter core block (14) from the outer peripheral surface (18A) of the small diameter core block (18) In the stacking direction across the inner surface (28A) of Connecting weld extending continue to (32) is provided.

  According to this configuration, the bonding strength between the large diameter core block (14) and the small diameter core block (18) is improved.

  In the laminated core (10), preferably, the recess (28) is defined by openings (30) formed in a plurality of successive ones of the first core thin plate.

  According to this configuration, the design freedom of the recess (28) is high, and can be easily formed.

  In the laminated core (10), preferably, the large diameter core block (14) is provided at each of both ends of the small diameter core block (18), and the recess (28) and the connection welding portion (32) It is provided about each of both large diameter core blocks (14).

  According to this configuration, the bonding strength between the small diameter core block (18) and the large diameter core block (14) provided on each of the both ends is improved.

  In the laminated core (10), preferably, the outer peripheral surface (18A) of the small diameter core block (18) provided with the connection welding portion (32) and the inner surface (28A) of the recess (28) It is continuous along the stacking direction.

  According to this configuration, a step does not occur in the middle of the connection welding portion (32), and the welding strength is improved.

  In the laminated core (10), preferably, the recesses (28) are provided at a plurality of locations along the circumferential direction of the large diameter core block (14).

  According to this configuration, the bonding strength between the large diameter core block (14) and the small diameter core block (18) is uniformly improved over the entire circumferential direction.

  Preferably, the laminated core (10) includes a large diameter core block weld (22) continuously extending the outer peripheral surface of the plurality of first thin sheets for iron core (12) in the stacking direction, and the plurality of the plurality It has a small diameter core block weld (26) which continuously extends in the stacking direction the outer peripheral surface of the second core thin plate (16).

  According to this configuration, all of the bonding of the first core thin plate (12) of the large diameter core block (14) and the second thin plate for iron core (16) of the small diameter core block (18) is performed by welding The production efficiency is improved and the equipment cost for producing the laminated core (10) is reduced.

  In the laminated core (10), preferably, the connection welding portion (32) is provided to form an extension of the small diameter core block welding portion (26).

  According to this configuration, the number of processes for positioning the laminated core (10) in the circumferential direction of the laminated core (10) or the welding head during the welding process of each part is reduced, and the production efficiency of the laminated core (10) is improved. .

  In the laminated core (10), preferably, the large diameter core block weld portion (22) and the small diameter core block weld portion (26) are provided at positions circumferentially aligned with each other.

  According to this configuration, the number of processes for positioning the laminated core (10) in the circumferential direction of the laminated core (10) or the welding head during the welding process of each part is reduced, and the production efficiency of the laminated core (10) is improved. .

  In the laminated core (10), preferably, in the large diameter core block (14) and / or the small diameter core block (18), the first thin sheet for iron core (12) or the second thin sheet for iron core (16) are bonded to each other by an adhesive (36).

  According to this configuration, the large diameter core block (14) and / or the small diameter core block (18) can be handled as a pre-blocked subassembly component, and the production efficiency of the laminated core (10) is improved.

  In the laminated core (10), preferably, in the large diameter core block (14) and / or the small diameter core block (18), the first thin sheet for iron core (12) or the second thin sheet for iron core (16) are joined together by caulking (38).

  According to this configuration, the large diameter core block (14) and / or the small diameter core block (18) can be handled as a pre-blocked subassembly component, and the production efficiency of the laminated core (10) is improved.

  ADVANTAGE OF THE INVENTION According to the laminated core by this invention, the joint strength of a large diameter core block and a small diameter core block is fully obtained.

The perspective view which shows the state before welding of one embodiment of the laminated core by this invention. Partial cross-sectional perspective view showing the main part of the laminated core according to the present embodiment Longitudinal sectional view showing the main part of the laminated core according to the present embodiment Top view of the first non-opening thin core sheet for laminated core according to the present embodiment A plan view of a first thin sheet for iron core with opening of laminated core according to the present embodiment A plan view of a second thin iron core sheet with an opening in the laminated core according to the present embodiment Longitudinal sectional view showing an essential part of a laminated core according to another embodiment of the present invention Longitudinal sectional view showing an essential part of a laminated core according to another embodiment of the present invention

  One preferred embodiment according to the present invention will be described with reference to FIGS.

  The laminated core 10 according to the present embodiment is used for a fixed core (stator core) of a rotating electrical machine such as an electric motor or a generator, and as shown in FIG. 1, a press punching having a first outer diameter D1. Between the upper and lower two large diameter core blocks 14 and the upper and lower two large diameter core blocks 14 formed by laminating a plurality of first iron core thin plates 12 formed of a workpiece and connecting them to each other And a small diameter core block 18 formed by laminating and connecting a plurality of second iron core thin plates 16 of a press punched product having a second outer diameter D2 smaller than the first outer diameter D1 and Are axially stacked on one another.

  In other words, the large diameter core block 14 is provided on each of both axial ends of the small diameter core block 18. That is, the laminated core 10 has a constriction formed by laminating the lower large diameter core block 14, the small diameter core block 18, and the upper large diameter core block 14 in this order from the bottom.

  The first iron core thin plate 12 and the second iron core thin plate 16 are each formed of a flat plate made of a magnetic steel plate or the like, as shown in FIGS. 4 to 6, and have annular main portions 12A, 16A and main It has a plurality of magnetic pole teeth 12B, 16B extending from the portions 12A, 16A toward the central portion, all stacked concentrically with one another. The inner diameters of the first iron core thin plate 12 and the second iron core thin plate 16 obtained by assembling the tips of the plurality of magnetic pole teeth 12B and 16B are the same.

  On the outer peripheral surface 14A of the large diameter core block 14, as shown in FIG. 1, a plurality of welding grooves 20 extending linearly in the stacking direction of the first thin core sheet 12 are equally spaced in the circumferential direction. Is formed. A groove defining surface (groove inner surface) including the bottom surface of each weld groove 20 forms a part of the outer peripheral surface 14A of the large diameter core block 14. As shown in FIGS. 2 and 3, each large diameter core block 14 is for the first iron core adjacent to each other by the large diameter core block welds 22 in which linear weld beads are formed in the weld grooves 20. The thin plates 12 are joined together and the whole is integrated.

  Each large diameter core block welded portion 22 may be formed by laser welding, and when the large diameter core block welded portion 22 is formed by laser welding, a weld bead is formed by melting of the first thin sheet for iron core 12 itself. As shown in FIG. 1, each welding groove 20 is substantially W-shaped having a projection 20A for forming a welding bead at the center in the groove width direction in plan view before welding. In this case, the groove defining surface of each welding groove 20 includes the surface of the ridge 20A before welding.

  Each large diameter core block weld portion 22 forms a sound weld portion in which a suitable weld bead is formed by melting the ridges 20A.

  In other words, each large diameter core block 14 is a linear large diameter core block welding in which the outer peripheral surfaces of the plurality of first core thin plates 12 extend continuously in the stacking direction of the first core thin plates 12. By joining the first thin plates for iron core 12 adjacent to each other by the portion 22, the whole is integrated.

  On the outer peripheral surface 18A of the small diameter core block 18, as shown in FIG. 1, a plurality of welding grooves 24 linearly extending in the stacking direction of the second core thin plate 16 are equally spaced in the circumferential direction. It is formed. The groove defining surface (the groove inner surface) including the bottom surface of each welding groove 24 forms a part of the outer peripheral surface 18A of the small diameter core block 18. In the small diameter core block 18, the second iron core thin plates 16 adjacent to each other are joined together by the small diameter core block welds 26 in which linear weld beads are formed in the weld grooves 24, and the whole is integrated.

  Each small diameter core block welded portion 26 may be formed by laser welding, and when the small diameter core block welded portion 26 is formed by laser welding, a weld bead is formed by melting of the second core thin plate 16 itself. As shown in FIG. 1, the welding groove 24 has a substantially W shape having a projection 24A for forming a welding bead at the center in the groove width direction in plan view before welding. In this case, the groove defining surface of each weld groove 24 includes the surface of the ridge 24A before welding.

  The small diameter core block welds 26 form a sound flat weld where appropriate weld beads are formed by melting the ridges 24A.

  In other words, the small diameter core block 18 is formed by the linear small diameter core block welds 26 which continuously extend the outer peripheral surfaces of the plurality of second thin sheets for iron core 16 in the stacking direction of the second thin sheets for iron core 16. The whole is integrated by joining the 2nd thin board 16 for iron cores which mutually adjoins.

  The welding groove 20, the large diameter core block welding portion 22, and the welding groove 24 and the small diameter core block welding portion 26 are provided at positions mutually aligned in the circumferential direction. That is, the large-diameter core block welds 22 and the small-diameter core block welds 26 are in the stacking direction of the first thin plate 12 for iron core and the second thin plate 16 for iron core (the bus direction of the large-diameter core block 14 and small diameter core block 18 Extends in a straight line).

  Recesses 28 are formed in the vicinity of the outer periphery of the small diameter core block 18 of the shoulder surface 14B of the upper and lower large diameter core blocks 14 formed on the side facing the small diameter core block 18. The recess 28 is formed along the circumferential direction of the large diameter core block 14 on both the upward facing shoulder surface 14B located on the lower end side of the small diameter core block 18 and the downward facing shoulder surface 14B located on the upper end side of the small diameter core block 18. A plurality of recesses 28 are provided at equal intervals, and the respective recesses 28 are provided at positions circumferentially aligned with the welding grooves 20 and 24.

  Each recess 28 is an opening (a through hole formed in a plurality of first iron core thin plates 12 which are adjacent to the second iron core thin plate 16 among the first iron core thin plates 12 by press punching) ) Is defined by a set of thirty.

  That is, as shown in FIG. 4, the first core thin plate 12 for iron core is not provided with the opening 30 in the main portion 12A, and as shown in FIG. There are two types of ones provided with the opening 30 of the present invention, and a plurality of continuous sheets including the one adjacent to the second core thin plate 16 is configured with the opening shown in FIG. 4 is constructed without the opening shown in FIG. Thus, each recess 28 forms a bottomed pit.

  Each recess 28 has a substantially trapezoidal shape having an upper base on the center side of the small diameter core block 18 in a plan view. The inner surface 28 A on the center side (upper bottom side) of the recess 28 is substantially W-shaped having a protrusion 28 B for forming a weld bead at the center in the groove width direction in plan view. It is continuous along the stacking direction with the bottom surface of the welding groove 24 which is a part of the outer peripheral surface 18A, specifically, substantially the outer peripheral surface 18A. In other words, the inner surface 28A of each recess 28 and the bottom surface (the outer peripheral surface 18A of the small diameter core block 18) of the corresponding welding groove 24 are flush with each other. Further, the ridges 28B of each recess 28 are circumferentially aligned with the ridges 20A of the corresponding weld groove 20 and the ridges 24A of the weld groove 24.

  Each concave portion 28 is set in a size and shape such that the welding head (not shown) can enter the concave portion of the concave portion 28 obliquely from the upper side or the lower side with respect to the concave portion 28 for connection welding portion 32 described later. . The recess 28 is easily formed by pressing because it is constituted by the opening 30 of the first core sheet 12 by press punching. The size and shape of the recess 28 are set by the shape of the opening 30 with a high degree of freedom in design.

  At the upper and lower two boundaries of each large diameter core block 14 and the small diameter core block 18, the outer peripheral surface 18A of the small diameter core block 18, in detail the inner surface 28A of each recess 28 corresponding to the bottom of each welding groove 24 A linear connection welding portion 32 continuously extending in the stacking direction is provided. The connecting welds 32 join adjacent first iron core thin plates 12 to one another, adjacent first iron core thin plates 12 and second iron core thin plates 16 and adjacent second iron core thin plates 16 with each other. . As a result, the connecting welds 32 join the large diameter core block 14 and the small diameter core block 18.

  Each connecting weld 32 may be by laser welding, and when each connecting weld 32 is by laser welding, the weld bead is produced by melting the first core thin plate 12 and the second core thin plate 16 itself. As described above, the inner surface 28A of the recess 28 also has a ridge W 20A for forming a weld bead at the center in the groove width direction in plan view before welding as in the weld groove 24 as described above. It has a letter shape. As a result, each connecting welding portion 32 forms a sound flat welding portion in which an appropriate weld bead is formed by melting the ridges 24A and 28B.

  Since each recess 28 is circumferentially aligned with the corresponding small diameter core block weld 26, each connecting weld 32 is provided with an extension in a straight line with the corresponding small diameter core block weld 26. Be Thus, each connecting weld 32 includes a portion R1 (see FIG. 3) that overlaps the corresponding small diameter core block weld 26.

  In the laminated core 10 according to the present embodiment, the connection welding portion 32 continuously extending in the stacking direction is provided from the groove bottom of each welding groove 24 to the inner surface 28A of each corresponding recess 28. That is, by providing the connecting welds 32 extending across each large diameter core block 14 and the small diameter core block 18, each large diameter core block is compared to the case where the connecting weld 32 is not provided. The bonding strength between the small diameter core block 18 and the small diameter core block 18 is improved.

  Since each connecting weld portion 32 has a portion R2 extending to the inner surface 28A of the recess 28, the first core thin plate 12 corresponding to this portion R2 has the large diameter core block weld portion 22 and the connection weld portion 32. It is joined by both sides. As a result, the joint strength between the first thin sheet for iron core 12 located at the boundary with the small diameter core block 18 and the vicinity thereof is improved, and the welding line of the first thin sheet for iron core 12 and the second thin sheet for iron core Since the 16 welding lines do not break off in the stacking direction, the welding strength of the entire laminated core 10 is improved.

  According to the laminated core 10 according to the present embodiment, the connection welds 32 are provided to form extensions of the corresponding small diameter core block welds 26, and further, the large diameter core block welds 22 correspond. The circumferential direction of the laminated core 10 or the welding head of the laminated core 10 or the welding head is provided at the time of the welding process of each part, as compared with the case where the small diameter core block welds 26 are aligned with the circumferential direction. The number of steps of positioning work is reduced, and the production efficiency of the laminated core 10 is improved.

  According to the laminated core 10 of the present embodiment, since the outer peripheral surface 18A of the small diameter core block 18 provided with the connection weld 32 and the inner surface 28A of the recess 28 are continuous along the stacking direction, the connection weld 32 is provided. There is no difference in level on the way, and the welding strength is improved. By providing a plurality of recesses 28 and welds 32 for connection at equal intervals along the circumferential direction of the large diameter core block 14, the bonding strength between the large diameter core block 14 and the small diameter core block 18 is all over the circumferential direction. Improve uniformly over time.

  According to the laminated core 10 according to the present embodiment, the recess 28 is defined by the openings 30 formed in a plurality of successive ones of the first core sheet 12, so that the design freedom of the recess 28 is high. The depth of the recess 28 can be set by the number of iron core thin plates 12 having the openings 30.

  In the laminated core 10 according to the present embodiment, since all of the joining of the first core sheet 12 and the second core sheet 16 is performed by welding including the welding portion 32 for connection, production efficiency is improved and welding is performed. The facility cost for manufacturing the laminated core 10 can be reduced since no bonding facility other than the facility is required.

  In the laminated core 10 according to another embodiment, in the large diameter core block 14 and the small diameter core block 18, the first iron core thin plates 12 and the second iron core thin plates 16 adjacent to each other in FIG. As shown, they are each joined by an adhesive 36 or, respectively, as shown in FIG.

  Also in the case of these embodiments, the connection welds 32 are provided, and the large diameter core block welds 22 and the small diameter core block welds 26 are joined by the connection welds 32. In the case of these embodiments, the large diameter core block welds 22 and the small diameter core block welds 26 may be omitted, but the large diameter core block welds 22 are shown by phantom lines in FIGS. 7 and 8. It may be provided as it is. In this case, in the large diameter core block 14, in addition to the bonding by the adhesive 36 or the bonding by the caulking portion 38, the bonding by the large diameter core block welded portion 22 is also performed, and the bonding strength is improved.

  In these embodiments, the large-diameter core block 14 and the small-diameter core block 18 are pre-blocked in addition to the improvement in the bonding strength between the large-diameter core block 14 and the small-diameter core block 18 as in the above-described embodiment. The production efficiency of the laminated core 10 is improved because it can be handled as an assembly part.

  While the present invention has been described above with reference to the preferred embodiments, it is to be understood that the present invention is not limited by such embodiments as can be readily understood by those skilled in the art, and deviates from the spirit of the present invention. It can change suitably in the range which is not.

  For example, the shape of the weld grooves 20 and 24 before welding is not limited to the substantially W shape in plan view, and may be another shape suitable for the welding method. The welding grooves 20 and 24 do not necessarily have to be provided at equal intervals in the circumferential direction of the large diameter core block 14 and the small diameter core block 18, and may be provided at unequal intervals in the same circumferential direction. Also, the weld grooves 20, 24 are not essential and may be omitted. In the present specification, the outer peripheral surface 14A of the large diameter core block 14 includes the bottom surface of the welding groove 20, and the outer peripheral surface 18A of the small diameter core block 18 includes the bottom surface of the welding groove 24.

  The large diameter core block welds 22 and the small diameter core block welds 26 do not necessarily extend in a straight line in the stacking direction of the first thin core for iron core 12 and the second thin core for iron core 16. The radial core block 14 and the small diameter core block 18 may be provided at mutually different positions in the circumferential direction.

  The shape of the concave portion 28 in plan view is not limited to the substantially trapezoidal shape, and may be determined in accordance with welding conditions, peripheral shape, etc., such as a rectangle, a semicircle, a triangle, or the like. The recess 28 may be a notch opened to the outer peripheral surface 14 A of the large diameter core block 14. The welding of each weld is not limited to laser welding, and may be electron beam welding, plasma arc welding or the like.

  Even if lamination and bonding of the large diameter core block 14 and the small diameter core block 18 are performed in a progressive die for press forming the first core thin plate 12 and the second core thin plate 16, the first core It may be performed outside the mold after press forming of the thin sheet 12 and the second thin sheet for iron core 16.

  Even if the large diameter core block 14 is any one of the upper stage and the lower stage, the small diameter core blocks 18 are disposed between the large diameter core blocks 14 of three or more large diameter core blocks 14 respectively. It is also good. The laminated core 10 is not limited to the core used for the stator of the rotary electric machine, and may be applied to the core (rotor core) of the rotor. In this case, the recess 28 is formed in the vicinity of the inner periphery of the small diameter core block of the shoulder surface formed on the side of the large diameter core block facing the small diameter core block.

  Moreover, all the components shown in the above embodiment are not necessarily essential, and it is possible to select them as appropriate without departing from the spirit of the present invention.

10: laminated iron core 12: first iron core thin plate 12A: main portion 12B: magnetic pole teeth 14: large diameter core block 14A: outer peripheral surface 14B: shoulder surface 16: second iron core thin plate 16A: main portion 16B: magnetic pole teeth 18: small diameter core block 18A: outer circumferential surface 20: weld groove 20A: ridge 22: large diameter core block weld 24: weld groove 24A: ridge 26: small diameter core block weld 28: recess 28A: inner surface 28B: ridge 30: Opening 32: Weld for connection 36: Adhesive 38: Crimping portion D1: first outer diameter D2: second outer diameter R1: overlapping portion R2: extending portion

Claims (10)

A large diameter core block formed by laminating a plurality of first iron core thin plates having a first outer diameter with each other and connecting them together, and a plurality of first having a second outer diameter smaller than the first outer diameter A laminated core in which small-diameter core blocks formed by laminating and bonding together the thin sheet for iron core of No. 2 are mutually laminated,
A recess is formed in the vicinity of the outer periphery of the small diameter core block of the shoulder surface of the large diameter core block formed on the side facing the small diameter core block,
A laminated core provided with a connecting weld continuously extending in the laminating direction from the outer peripheral surface of the small diameter core block to the inner surface of the recess formed in the large diameter core block.   The laminated core according to claim 1, wherein the recess is defined by an opening formed in a plurality of successive ones of the first core sheet.   The laminated core according to claim 1 or 2, wherein the large diameter core block is provided at each of both ends of the small diameter core block, and the recess and the connecting weld are provided for each of the large diameter core blocks.   The laminated core according to any one of claims 1 to 3, wherein the outer peripheral surface of the small diameter core block provided with the connecting weld portion and the inner surface of the recess are continuous along the stacking direction.   The laminated core according to any one of claims 1 to 4, wherein the recessed portions are provided at a plurality of locations along the circumferential direction of the large diameter core block.   The outer peripheral surfaces of the large diameter core block welds that continuously extend the outer peripheral surface of the plurality of first thin sheets for iron core in the stacking direction and the outer peripheral surfaces of the plurality of second thin iron core sheets in the stacking direction The laminated core according to any one of claims 1 to 5, having a small diameter core block weld extending.   The laminated core according to claim 6, wherein the connecting weld portion is provided to form an extension of the small diameter core block weld portion.   The laminated core according to claim 6 or 7, wherein the large diameter core block weld portion and the small diameter core block weld portion are provided at positions circumferentially aligned with each other.   6. The large diameter core block and / or the small diameter core block according to any one of claims 1 to 5, wherein the first thin core for iron core or the second thin core for iron core is bonded to each other by an adhesive. Description laminated core.   6. The large diameter core block and / or the small diameter core block according to any one of claims 1 to 5, wherein the first thin core for iron core or the second thin core for iron core is connected to each other by caulking. Laminated core.

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