JP6917325B2 - Manufacturing method of laminated iron core for vehicle drive motor and laminated iron core - Google Patents

Description

The present invention relates to a method for manufacturing a laminated iron core of a vehicle drive motor and a laminated iron core of a vehicle drive motor.

Patent Document 1 below describes a method for producing a laminate, in which an annular layer is formed by using a plurality of fan-shaped segments and a predetermined number of annular layers are laminated to produce a laminate. The laminate of Cited Document 1 has a configuration in which the segments are stacked in a brick shape by shifting the positions of the segments by a predetermined angle in the circumferential direction when the annular layers are stacked.

International Publication No. 2012/043632

By the way, in the laminated iron core, for example, annular core pieces are joined by welding or caulking in the laminated direction at a plurality of locations on the inner peripheral surface. In a laminated iron core in which annular core pieces formed by arranging a plurality of arc-shaped iron core pieces are laminated, each of the arc-shaped iron core pieces is welded or crimped in the laminating direction. In such a laminated iron core, centrifugal force acts on each of the arcuate core pieces by being rotated during use. For this reason, in the laminated iron core, there is a concern that the arcuate core pieces constituting the annular core pieces may be displaced or detached at both ends in the stacking direction.

The present invention has been made in view of the above facts. For the purpose of provision.

The method for manufacturing a laminated iron core of a vehicle drive motor according to claim 1 of the present invention includes a pressing process for producing a plurality of arcuate core pieces by pressing a magnetic steel plate, and an annular shape of the arcuate core pieces. A laminating step of manufacturing a laminated iron core body by laminating a plurality of the annular core pieces with a phase shift in the circumferential direction while forming an annular core piece, and each layer shifted in the circumferential direction of the laminated iron core body. In the annular core piece of the above, the arcuate core pieces adjacent to each other in the stacking direction are welded to each other, and in the annular core piece at the stacking direction end of the laminated iron core body, the arcuate core pieces adjacent to each other in the circumferential direction are welded to each other. It has a welding process of joining.

In the method for manufacturing a laminated iron core of a vehicle drive motor according to claim 1, a plurality of arc-shaped iron core pieces are manufactured by pressing a magnetic steel plate in a pressing process. Further, in the laminating step, a laminated iron core body is manufactured by laminating a plurality of annular core pieces with a phase shift in the circumferential direction while forming an annular core piece by arranging arc-shaped iron core pieces in an annular shape.

In the welding process, arcuate core pieces adjacent to each other in the stacking direction are welded to each other in the annular core pieces of each layer that are out of phase in the circumferential direction of the laminated core body. Further, in the welding step, the arcuate core pieces adjacent to each other in the circumferential direction are welded and joined at the annular core pieces at the stacking direction end (axial end of the laminated iron core body) of the laminated iron core body. When welding arcuate cores adjacent to each other in the circumferential direction, it is preferable to weld in the radial direction of the laminated core body.

As a result, the arcuate core pieces forming the annular core pieces can be joined to each other at the ends in the stacking direction, so that a high quality laminated iron core capable of suppressing the displacement of the arcuate core pieces during rotation can be obtained.

The method for manufacturing a laminated iron core of a vehicle drive motor according to claim 2 is the method for manufacturing a laminated iron core for a vehicle drive motor according to claim 1, wherein the laminated iron core main body is adjacent to the laminated iron core body in the circumferential direction. A convex portion protruding in the circumferential direction is formed on one of the arc-shaped iron core pieces, and a concave portion into which the convex portion is fitted is formed on the other of the arc-shaped iron core pieces adjacent in the circumferential direction. ..

In the method for manufacturing a laminated iron core of a vehicle drive motor according to claim 2, a convex portion is formed on one of the arcuate iron core pieces welded at the end in the laminated direction, and a convex portion is formed on the other, and the convex portion is formed in the circumferential direction. In the arcuate iron core piece adjacent to, one convex portion is fitted into the other concave portion. As a result, the arcuate core pieces adjacent to each other at the ends in the stacking direction can be suppressed from being displaced in the radial direction during welding. Further, by increasing the area of the welded portion, the welding strength can be increased, and it is possible to effectively suppress the displacement of the arcuate iron core piece during rotation.

The method for manufacturing a laminated iron core of a vehicle drive motor according to claim 3 is the method for manufacturing a laminated iron core for a vehicle drive motor according to claim 2, which is adjacent to the laminated iron core main body in the circumferential direction at the end in the laminated direction. A plurality of the convex portions are formed in the radial direction on one of the arcuate iron core pieces to be formed, and each of the convex portions is fitted to the other of the arcuate iron core pieces adjacent in the circumferential direction. Multiple recesses are formed in the radial direction.

In the method for manufacturing a laminated iron core of a vehicle drive motor according to claim 3, a plurality of convex portions are formed on one of the arcuate core pieces at the end in the stacking direction, and a plurality of concave portions are formed on the other of the arcuate core pieces. Then, each of the plurality of convex portions is fitted into the concave portion. As a result, when the arcuate core pieces are welded to each other at the stacking direction end, the welding strength can be increased by increasing the area of the welded portion, and it is more effective that the arcuate core pieces are displaced during rotation. Can be suppressed.

The laminated iron core of the vehicle drive motor according to claim 4 is formed by arranging a plurality of arcuate core pieces using magnetic steel plates in an annular shape, and the phases of the plurality of annular core pieces are shifted in the circumferential direction. In the laminated core body and the annular core pieces of each layer that are out of phase in the circumferential direction of the laminated core body, the welded portion in which the arcuate core pieces adjacent to each other in the stacking direction are welded, and the laminated core body. The annular core piece at the end in the stacking direction of the above has a joint portion in which the arcuate core pieces adjacent to each other in the circumferential direction are welded and joined. As a result, in the iron core of the vehicle drive motor according to claim 4, since the arc-shaped iron core pieces forming the annular core pieces are joined to each other at the stacking direction end, the arc-shaped iron core pieces are displaced during rotation. Can be suppressed.

The laminated iron core of the vehicle drive motor according to claim 5 is projected in the circumferential direction from one of the arcuate core pieces joined at the joint portion in the laminated iron core of the vehicle drive motor according to claim 4. A convex portion is formed, and a concave portion into which the convex portion is fitted is formed on the other side of the arcuate iron core piece joined at the joint portion. As a result, in the vehicle drive motor according to claim 5, the welding strength can be increased by increasing the area of the welded portion between the arcuate core pieces at the stacking direction end, and the arcuate core pieces are displaced during rotation. Can be effectively suppressed.

The laminated iron core of the vehicle drive motor according to claim 6 has a convex portion having a diameter on one of the arcuate core pieces joined at the joint portion in the laminated iron core of the vehicle drive motor according to claim 5. On the other side of the arcuate iron core piece formed in a plurality of directions and joined at the joint portion, a plurality of recesses in which each of the convex portions is fitted are formed in the radial direction. As a result, in the vehicle drive motor according to claim 6, the welding strength can be further increased by increasing the area of the welded portion between the arcuate core pieces at the stacking direction end, and the arcuate core pieces are displaced during rotation. Can be suppressed more effectively.

As described above, according to the present invention, it is possible to suppress the occurrence of displacement of the arcuate core pieces forming the annular core pieces at the ends in the stacking direction, and it is possible to obtain a high quality laminated iron core. ..

It is a perspective view of the laminated iron core of the vehicle drive motor which concerns on 1st Embodiment of this invention. It is an exploded perspective view which shows the partial structure of a laminated iron core. It is a schematic cross-sectional view of the laminated iron core which shows the cut surface along the F3-F3 line of FIG. It is a front view which shows the structure of the stacking assembly apparatus used in a stacking process and its periphery. It is a top view which looked at the inside of the laminated assembly apparatus from the upper side. It is a perspective view which shows the main part of the laminated assembly apparatus in an enlarged manner. It is a perspective view which shows the laminated iron core body laminated on the alignment jig. It is a perspective view which shows the state which the inner peripheral surface of a laminated iron core body is welded in a welding process. It is the schematic which shows the weld | weld | weld part of arc-shaped iron core pieces to each other in 1st Embodiment. It is the schematic which shows the weld | weld | weld part of arc-shaped iron core pieces to each other in 2nd Embodiment. It is the schematic which shows the weld | weld | weld part of the arc-shaped iron core piece to each other which concerns on the modification of 2nd Embodiment.

[First Embodiment]
Hereinafter, a method for manufacturing a laminated iron core of a vehicle driving motor and a laminated iron core according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 9.

(Structure of laminated iron core)
First, the laminated iron core 10 (hereinafter, simply referred to as “laminated iron core 10”) manufactured by the method for manufacturing the laminated iron core of the vehicle drive motor according to the first embodiment will be described. The laminated iron core 10 is a laminated rotor core used on the rotor side of a vehicle driving motor (motor), and is a component of a rotor with a magnet.

As shown in FIG. 1, the laminated iron core 10 includes a laminated iron core body 16 formed by laminating a plurality of annular core pieces 14 in which arc-shaped core pieces 12 (divided iron core pieces) divided into four are arranged in an annular shape. , Is formed by being integrated by a plurality of welded portions 18. As a result, the axial direction of the laminated iron core body 16 is set to the laminating direction of the annular core pieces 14. In the following description, the circumferential direction is a direction corresponding to the circumferential direction of the laminated iron core main body 16, and the angle is an angle corresponding to an angle centered on the axial center of the laminated iron core main body 16. Further, in the first embodiment, when the annular core pieces 14 at the ends in the stacking direction (both ends in the stacking direction) of the annular core pieces 14 in the laminated iron core body 16 are particularly distinguished, they are referred to as "annular core pieces 14A".

In the first embodiment, each arc-shaped iron core piece 12 has an arc angle θ set to 90 degrees. In each arc-shaped iron core piece 12, the end faces 13 on both sides in the circumferential direction are formed linearly in the radial direction. A plurality of (here, four) arc-shaped magnet mounting portions 20 (magnetic pole piece portions) arranged in the circumferential direction are formed on the outer peripheral portion of each arc-shaped iron core piece 12. The arc angle δ of these magnet mounting portions 20 is set to 22.5 degrees, and each magnet mounting portion 20 is formed with a magnet mounting hole 22 for mounting a magnet.

Further, in the intermediate portion in the width direction of each arc-shaped iron core piece 12 (intermediate portion between the outer circumference and the inner circumference, the radial intermediate portion of the laminated iron core main body 16), a plurality of (four in this case) arranged in the circumferential direction are arranged. A circular guide hole 24 is formed. These guide holes 24 are guide pins 68 (see FIG. 7) provided in the alignment jig 62 (see FIGS. 7 and 8) used when laminating a plurality of annular core pieces 14 and welding the laminated iron core main body 16. It is a pilot hole for inserting.

The guide hole 24 and the magnet mounting portion 20 are provided so as to be arranged at every 22.5 degrees in a state where the arc-shaped iron core pieces 12 are arranged in an annular shape to form the annular iron core piece 14. The holes 24 are provided in the circumferential direction of the annular iron core piece 14 in the same phase as the magnet mounting portion 20.

As shown in FIG. 2, in the annular core pieces 14 that overlap each other, the joints 26 of the arcuate core pieces 12 in the circumferential direction are out of phase in the circumferential direction, and a predetermined number of pieces are laminated in a so-called brickwork. Then, the end faces 13 of the arcuate iron core pieces 12 face each other. Then, in the first embodiment, the above-mentioned phase shift angle is set to 22.5 degrees, which is the same as the arc angle δ of the magnet mounting portion 20.

When the annular iron core pieces 14 are laminated with a phase shift of 22.5 degrees, the magnet mounting portion 20 and the guide hole 24 are arranged at every 22.5 degrees, so that the magnet mounting portion 20 and the guide hole 24 are respectively arranged. Positions match the stacking direction. Therefore, the magnet mounting portion 20 and the guide hole 24 penetrate from one end side in the axial direction of the laminated iron core body 16 to the other end side in the axial direction.

As shown in FIG. 1, a plurality of welded portions 18 for integrating the plurality of annular core pieces 14 laminated as described above are provided side by side in the circumferential direction on the inner peripheral portion of the laminated iron core main body 16. In the first embodiment, the plurality of welded portions 18 are provided with the same number of magnetic poles (16 poles in this case) as the number of magnetic poles of the laminated iron core main body 16, and the arcuate iron core pieces 12 of each layer phase-shifted in the circumferential direction are welded portions. In 18, the arcuate iron core pieces 12 are welded (joined) to each other along the stacking direction.

The plurality of welded portions 18 are located on the opposite side of the magnet mounting portion 20 via the guide holes 24, and are provided on the inner peripheral portion of the laminated iron core main body 16 at intervals of 22.5 degrees. A key groove (not shown) may be formed between the plurality of welded portions 18, and the key groove may not necessarily be formed.

Further, as shown in FIG. 9, in the annular core pieces 14A at both ends in the stacking direction, a joint portion 28 is formed in which the arcuate core pieces 12 are welded to each other at the seam 26 in which the end faces 13 face each other. ing. The arcuate core pieces 12 at the seam 26 may be joined with a gap between the end faces 13 within a range that does not affect the quality (product quality) of the laminated iron core 10.

(Manufacturing method of laminated iron core 10)
Next, a method for manufacturing the laminated iron core 10 having the above configuration will be described.
The method for manufacturing the laminated iron core 10 is composed of a pressing process which is a first step, a laminating step which is a second step, a welding step which is a third step, and an inspection step which is a fourth step.

(Press process)
As shown in FIGS. 4 to 6, in the pressing process, a strip-shaped magnetic steel plate is pressed by a mold device. As a result, in the pressing process, a veneer 30 with a carrier is manufactured in which a plurality of arcuate iron core pieces 12 are connected by a pair of connecting portions 32. Then, the manufactured veneer 30 with a carrier is wound around the reel 34, and the process proceeds to the next laminating process.

Further, in this pressing process, the arcuate iron core piece 12 is press-formed on the veneer 30 with a carrier by controlling the on / off of five slit cut portions (not shown) provided in the press machine. ..

(Laminating process)
In the laminating step, the arcuate core pieces 12 are sequentially separated from the carrier-equipped veneer 30 to be conveyed, and the separated arcuate core pieces 12 are arranged in an annular shape to form the annular core pieces 14, and the plurality of annular core pieces 14 are formed. The laminated iron core main body 16 is manufactured by laminating the laminated iron cores with a phase shift in the circumferential direction.

Specifically, first, the reel 34 is attached to the reel stand 36 shown in FIG. 4, and the veneer 30 with a carrier wound around the reel 34 is unwound to form the laminated assembly apparatus 38 shown in FIGS. 4 and 5. It is wound around a guide roller 40 (see FIG. 4) and inserted into the laminated assembly device 38. The veneer 30 with a carrier may be conveyed from the pressing process to the laminating process without being wound around the reel 34 and inserted into the laminating assembly device 38.

A feed feeder 42, a servo press 46, an electric index machine 48, a robo cylinder 50, and a control panel 52 for controlling the operation of these are provided in the laminated assembly device 38. The feed feeder 42 holds the veneer 30 with a carrier inserted in the laminated assembly device 38 and conveys it to the servo press 46 and the electric index machine 48 side. The direction indicated by the arrow A in FIGS. 4 and 5 is the transport direction of the veneer 30 with a carrier. Further, the arcuate core piece 12 is arranged in the transport direction of the carrier in order to improve the material picking efficiency (material yield) and to avoid deformation such as warpage of the arcuate core piece 12 when the carrier is wound and stored. It is placed at right angles to it.

A joint cut type punch 54 is attached to the servo press 46, and the veneer 30 with a carrier is conveyed to and from the joint cut type die 56 arranged on the lower side of the punch 54. The arcuate iron core piece 12 is sequentially separated from the connecting portion 32 of the above. The connecting portion 32 from which the arcuate iron core piece 12 is separated is discharged to the outside of the laminated assembly device 38 through the transport pipe 58 (not shown in FIGS. 4 and 5) shown in FIG. 6, and is scrap (not shown). It is transported to the cutting machine.

The separated arcuate iron core piece 12 is pushed by the punch 54 onto the alignment jig 62 detachably attached to the rotary table 60 of the electric index machine 48. As shown in FIGS. 6 and 7, the alignment jig 62 includes a ring-shaped lower plate 64 and a plurality of (16 here) guide pins 68 (pilot pins) protruding upward from the lower plate 64. And a plurality of (here, eight) columns 70 protruding upward from the alignment jig 62. The number of guide pins 68 and columns 70 can be changed as appropriate.

The 16 guide pins 68 are arranged at equal intervals (intervals of 22.5 degrees) in the circumferential direction of the lower plate 64, and are firmly fixed to the lower plate 64. Further, the eight columns 70 are arranged at equal intervals (intervals of 45 degrees) in the circumferential direction of the lower plate 64 on the inner peripheral side of the lower plate 64 than the 16 guide pins 68, and are arranged on the lower plate 64. It is firmly fixed. The alignment jig 62 includes the ring-shaped upper plate 72 shown in FIG. 8, but is used in the laminating step with the upper plate 72 removed.

The arcuate iron core piece 12 pushed onto the alignment jig 62 is held on the alignment jig 62 with the guide pins 68 inserted into the four guide holes 24, respectively. The alignment jig 62 is rotated about the vertical axis in conjunction with the feed feeder 42 and the servo press 46 by the rotary table 60 of the electric index machine 48, and is lowered at a predetermined timing by the robo cylinder 50.

Specifically, first, in order to form the annular core piece 14 by arranging the arc-shaped iron core pieces 12 in an annular shape, the alignment jig 62 is shown each time one arc-shaped iron core piece 12 is pushed onto the alignment jig 62. It is rotated 90 degrees (arc angle θ of the arcuate iron core piece 12) in the direction of arrow B of 5. By repeating this 90-degree rotation three times, the one-layer annular iron core piece 14 is completed. Next, the alignment jig 62 is lowered by the robo cylinder 50 by the plate thickness of the arcuate core piece 12, and the electric index machine 48 lowers the alignment jig 62 in the direction of arrow B in FIG. 5 by an angle of 22.5 degrees corresponding to the arc angle δ. It is rotated by (phase shift angle). By sequentially repeating the above processing, a plurality of annular core pieces 14 are laminated (rotationally laminated) with their phases shifted in the circumferential direction, and the laminated iron core main body 16 is manufactured.

Here, in the first embodiment, first, the four arcuate core pieces 12 are arranged in an annular shape in the circumferential direction, and the first layer annular core piece 14A, which is one end in the stacking direction, is arranged. Next, the four arcuate core pieces 12 are arranged in an annular shape in the circumferential direction to complete the second layer of the annular core pieces 14. Next, similarly to the annular core piece 14 of the second layer, the arcuate core pieces 12 are arranged in the circumferential direction, and the annular core pieces 14 of the third layer and the annular core pieces 14 of the fourth layer are arranged in this order. 14 is completed. Finally, by arranging the four arcuate core pieces 12 in an annular shape in the circumferential direction, the annular core piece 14A similar to the first layer is arranged in the uppermost layer which is the other end in the stacking direction.

Therefore, in the first embodiment, the annular iron core pieces 14 are laminated by the laminating step, and the positions of the welded portions 18 coincide with the laminating direction. In addition, annular iron core pieces 14A are arranged at both ends in the stacking direction. Then, the manufactured laminated iron core body 16 is removed from the rotary table 60 together with the alignment jig 62, and the process proceeds to the welding process of the next process.

(Welding process)
In the welding process, the phase shift in the circumferential direction is performed at a plurality of portions arranged in the circumferential direction of the laminated iron core body 16 (here, 16 locations in the inner peripheral portion of the laminated iron core main body 16: see the welded portions 18 in FIGS. 1 and 3). The arcuate core pieces 12 of each layer are welded together along the stacking direction.

Specifically, first, as shown in FIG. 8, the upper plate 72 is attached to the alignment jig 62. The upper plate 72 is fixed to the upper ends of the eight columns 70 by, for example, bolting, and holds the laminated iron core body 16 to a predetermined thickness. Alternatively, the laminated iron core main body 16 is held to a predetermined thickness by a dedicated holding device that holds the upper plate 72 and the lower plate 64 vertically with eight columns 70 sandwiched between them.

Next, the alignment jig 62 is mounted on the rotary table 60 included in the fiber laser welder, and each of the welded portions 18 arranged in the circumferential direction on the inner peripheral portion of the laminated iron core main body 16 by the fiber laser welder is in the circumferential direction. The arcuate core pieces 12 of the out-of-phase layers are welded along the stacking direction. The member designated by reference numeral 76 in FIG. 8 is a processing head of a fiber laser welder.

After that, the upper plate 72 is removed, and at the seam 26 of the annular core piece 14A, which is the uppermost layer of the laminated iron core body 16, the arcuate core pieces 12 adjacent to each other by a fiber laser welder as a joining means Perform welding (laser welding). As a result, in the uppermost annular core piece 14A, a joint portion 28 in which the arcuate iron core pieces 12 are joined to each other is formed, and the uppermost annular core piece 14A is completed. Further, in a state where the laminated iron core body 16 is inverted in the axial direction and is attached to the alignment jig 62 again, the adjacent arcuate core pieces 12 are connected to each other at the seam 26 of the annular core piece 14A which is the uppermost layer. Welding (laser welding). As a result, in the annular core piece 14A that was initially the lowest layer (first layer), a joint portion 28 in which the arcuate iron core pieces 12 are joined to each other is formed, and the annular core piece 14A is completed.

Here, as shown in FIG. 9, the adjacent arcuate core pieces 12 are welded to each other in the radial direction at the seam 26 to form a substantially linear joint portion 28 along the radial direction. Further, when the arcuate core piece 12 is welded, the arcuate core piece 12 is welded to each of the arcuate core pieces 12 of the annular core piece 14A in the annular core piece 14 of the next layer in contact with the annular core piece 14A. Is preferable. When the laminated iron core body 16 is inverted and the annular core piece 14A, which is the lowest layer, is used as the uppermost layer, the arc-shaped iron core piece 12 without attaching the inverted laminated iron core body 16 to the alignment jig 62. Welding may be performed with each other. Further, the arcuate core pieces 12 of the annular core pieces 14A may be welded to each other by using a jig instead of the alignment jig 62, and the laminated iron core main body 16 is not inverted and the annular ends at both ends in the stacking direction are annular. In the iron core piece 14A, the arcuate iron core pieces 12 may be joined to each other.

As a result, the laminated iron core 10 is completed. The completed laminated iron core 10 undergoes a predetermined inspection in the inspection step of the next step.

(Action and effect)
Next, the action and effect in the first embodiment will be described.
In the first embodiment, the laminated iron core 10 is manufactured by the above-mentioned pressing step, laminating step, and welding step. In the laminated iron core 10, each of the annular core pieces 14 is formed by a plurality of arcuate core pieces 12 arranged in an annular shape, and the plurality of annular core pieces 14 are laminated with their phases shifted in the circumferential direction to form the laminated iron core body 16. It is configured. A plurality of welded portions 18 are provided side by side in the circumferential direction on the inner peripheral portion of the laminated iron core main body 16. In these welded portions 18, arcuate core pieces 12 of each layer that are out of phase in the circumferential direction are welded together along the stacking direction.

As a result, the arcuate iron core pieces 12 of each layer can be integrally connected, so that a dedicated facility for simultaneously caulking and laminating is not required, and as a result, the manufacturing cost can be reduced. Further, since the arcuate iron core piece 12 having a smaller size than the annular iron core piece 14 is used, the mold for press-forming the magnetic steel plate in the pressing process can be miniaturized, and one type of mold can be used. can. Therefore, the arc-shaped iron core piece 12 having high positional accuracy and shape processing accuracy of the magnet mounting hole 22 and the guide hole 24 and having uniform processing accuracy can be formed. A quality laminated iron core 10 can be obtained. Moreover, by using one type of arcuate iron core piece 12, the yield of the material (magnetic steel plate) can be improved (the amount of waste material after pressing can be reduced), and the work in the pressing process and the laminating process can be simplified. Manufacturing workability can be improved.

Here, in the laminated iron core body 16, adjacent arcuate core pieces 12 are welded to each other in the radial direction at the seams 26 of the annular core pieces 14A at both ends in the stacking direction. Therefore, the joint strength of the arcuate core piece 12 welded only on one side in the stacking direction in the welded portion 18 can be increased, and the arcuate core piece 12 forming the annular core piece 14A can be suppressed from being displaced.

Further, when welding the arcuate core pieces 12 adjacent to each other at the seam 26, the arcuate core piece 12 of the annular core piece 14 of the next layer in contact with the annular core piece 14A can be welded. Therefore, the joint strength of the arcuate core piece 12 of the annular core piece 14A can be made higher, and the deviation of the arcuate core piece 12 can be effectively suppressed.

As a result, when the laminated iron core 10 is used in the vehicle drive motor and rotated, even if a centrifugal force acts on the arcuate iron core piece 12 of the annular core piece 14A, the centrifugal force causes the arcuate shape of the annular core piece 14A. It is possible to prevent the iron core piece 12 from being displaced. Therefore, a high quality laminated iron core 10 can be manufactured.

On the other hand, in the laminated iron core body 16, as a method of increasing the joint strength of the arc-shaped iron core pieces 12 at both ends in the stacking direction, the arc-shaped iron core piece 12 of the annular core piece 14A and the following are used in the inner peripheral portion of the laminated iron core body 16. It is conceivable to weld the arcuate iron core piece 12 of the annular iron core piece 14 of the layer. In this case, since the arcuate core piece 12 of the annular core piece 14A overlaps the two arcuate core pieces 12 of the annular core piece 14 of the next layer, it is necessary to weld at least two places. That is, when one annular core piece 14A is formed by four arcuate core pieces 12, welding at eight or more locations (16 locations at both ends in the stacking direction) is required.

On the other hand, at the seam 26 of the annular core piece 14A, by welding the arcuate core pieces 12 to each other in the radial direction, there are four welding points (joints 28) (when there are four arcuate core pieces 12). ) Is sufficient, so the number of welded parts can be reduced as compared with the above method. Therefore, it is possible to suppress an increase in welding man-hours and a decrease in manufacturing efficiency of the laminated iron core 10.

Further, the annular core piece 14A uses an arcuate core piece 12 like the other annular core pieces 14, and the laminated iron core body 16 is formed by laminating one type of arcuate core piece 12. There is. Therefore, it is possible to suppress a decrease in workability in the pressing process of pressing the arcuate iron core piece 12 and the laminating process of laminating the arcuate iron core piece 12.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 10 is a schematic view of a main part of the annular iron core piece 14B according to the second embodiment. In the second embodiment, the annular core pieces 14B are formed at both ends in the stacking direction in place of the annular core pieces 14A of the first embodiment. The annular core piece 14B uses an arc-shaped iron core piece 80 instead of the arc-shaped iron core piece 12, and the annular core piece 14B has a plurality of (four in the second embodiment) arc-shaped iron core pieces 80 in an annular shape. They are lined up in. The arcuate core piece 80 has the same basic configuration as the arcuate core piece 12, but the arcuate core piece 80 is different from the arcuate core piece 12 in the shape of both ends in the circumferential direction.

At one end of the arcuate iron core piece 80 in the circumferential direction, one or more (four in the second embodiment) convex portions 82 are formed so as to project in the circumferential direction. A recess 82A is formed between them. As a result, at one circumferential end of the arcuate iron core piece 80, an end face 84 having a substantially wavy shape in the stacking direction is formed by the convex portion 82 and the concave portion 82A. Further, a concave portion 86 facing the convex portion 82 is formed at the other end portion of the arcuate iron core piece 80 in the circumferential direction, and a convex portion 86A facing the concave portion 82A is formed between the concave portions 86. It is formed. As a result, at the other circumferential end of the arcuate iron core piece 80, an end face 88 having a substantially wavy shape in the stacking direction is formed by the concave portion 86 and the convex portion 86A.

As a result, in the annular core piece 14B, a substantially corrugated seam 90 is formed between the arcuate core pieces 80 adjacent to each other. In the annular core piece 14B, the arcuate core pieces 80 are welded (laser welded) to each other at the seam 90.

Here, in the annular iron core piece 14B, the height of the top of the convex portion 82 (or the convex portion 86A) seen from the bottom of the concave portion 82A (or the concave portion 86), which is the amplitude of the joint 90 (height difference in the circumferential direction). A certain step Ha is made smaller than the joint width (welding width in laser welding) W at the joint portion 28 (the difference is such that the welding allowance can be secured). In the annular core piece 14B, the arcuate core pieces 80 are joined to each other by the joint portion 28 having a substantially linear shape in the radial direction at the substantially wavy joint 90. The arcuate iron core pieces 80 at the seam 90 may be joined with a gap provided between the end face 84 and the end face 88 as long as the product quality is not affected. In that case, the step Ha is the length obtained by adding the gap between the end face 84 (or the end face 88) and the end face 88 to the height difference.

Therefore, in the annular core piece 14B, when the arcuate core pieces 80 are arranged in an annular shape, the convex portion 82 is fitted into the concave portion 86, and the convex portion 86A is fitted into the concave portion 82A, so that the convex portions 86A are adjacent to each other. It is possible to suppress the occurrence of radial deviation between the arc-shaped iron core pieces 80. Further, in the annular core piece 14B, the arcuate core pieces 80 adjacent to each other at the seam 90 are welded and joined. At this time, since the seam 90 has a substantially wavy shape, the areas of the end faces 84 and 88 of the arcuate core piece 80 are wider than the area of the end faces 13 of the arcuate core piece 12. Therefore, the joint strength between the arc-shaped iron core pieces 80 at the seam 90 can be made higher than the joint strength between the arc-shaped iron core pieces 12 at the seam 26. As a result, in the annular core piece 14B, it is possible to effectively suppress the displacement of the arcuate iron core piece 80 due to the centrifugal force generated during rotation, and the laminated iron core provided with the annular core piece 14B can be made of high quality.

[Modified example of the second embodiment]
FIG. 11 shows a schematic view of the main portion of the annular core piece 14C according to the modified example of the second embodiment, and the annular core piece 14C is formed at both ends of the laminated iron core body 16 in the stacking direction. The annular iron core piece 14C is configured by arranging arc-shaped iron core pieces 80A in an annular shape.

The arcuate iron core piece 80A has a convex portion 94 and a concave portion 94A formed at one end in the circumferential direction to form a substantially wavy end face 84A in the stacking direction, and the other end in the circumferential direction. A concave portion 96 and a convex portion 96A are formed in the portion, and a substantially corrugated end face 88A is formed in the stacking direction. In the annular core piece 14C, the arcuate core pieces 80A are arranged in a ring shape to form a substantially corrugated seam 90A between the arcuate core pieces 80A adjacent to each other. The annular core piece 14C is welded by laser welding, and the arcuate core pieces 80A are joined by a substantially corrugated joint portion 98 along the joint 90A.

In the annular core piece 14C configured in this way, the same effect as that of the annular iron core piece 14B can be obtained. Moreover, since the joints are made along the seam 90A, the welding allowance can be secured even if the step Hb is larger than the joint width W, so that the arc-shaped iron core pieces 80A can be properly welded to each other.

Further, in the joint portion 98, the amount of heat input at the central portion in the joint width W is relatively large, and in the joint portion 98, the position of the central portion overlaps with the position of the seam 90A. Therefore, in the annular core piece 14C, the arcuate core pieces 80A are more properly welded to each other at the joint portion 98. Further, in the joint portion 98, the welding length is longer than that in the joint portion 90. Therefore, in the joint portion 98, the joint strength of the next layer in contact with the annular core piece 14C with the annular core piece 14 is further increased. The arcuate iron core pieces 80A at the seam 90A may be joined with a gap provided between the end face 84A and the end face 88A within a range that does not affect the product quality.

Further, in the annular core piece 14C, the area of the end faces 84A and 88A of the arcuate core piece 80A is wider than the area of the end faces 84 and 88 of the arcuate core piece 80. Therefore, the joint strength between the arc-shaped iron core pieces 80A at the seam 90A can be made higher than the joint strength between the arc-shaped iron core pieces 80 at the seam 90. As a result, in the annular core piece 14C, it is possible to more effectively suppress the displacement of the arcuate iron core piece 80A due to the centrifugal force generated during rotation, and the laminated iron core provided with the annular core piece 14B can be made of higher quality.

[Supplementary Description of Embodiment]
In the first embodiment, the second embodiment and the modified example described above, laser welding is applied as the joining means, but the joining means is other than laser welding such as electron beam welding, light beam welding and arc welding. Welding means may be applied.

Further, in the second embodiment and the modified example, the arcuate core pieces 80 and 80A are provided with the convex portions 82 and 86A, the concave portions 86 and 82A or the convex portions 94 and 96A and the concave portions 96 and 94A. And the shape of the recess is not limited to this. The shape and number of the convex portions and the concave portions in the present invention may be any shape and number that can prevent the arcuate core pieces from being displaced in the annular core pieces at the ends in the stacking direction.

Further, in the second embodiment and the modified example, the circular iron core pieces 14B and 14C at both ends in the stacking direction are described by using the arc-shaped iron core pieces 80 and 80A. It may be used for constructing an annular core piece to be laminated between both ends in the stacking direction. As a result, it is possible to prevent radial deviations from occurring between the arcuate core pieces arranged in a ring shape when forming the annular core pieces of each layer. Further, the arc-shaped iron core pieces constituting the laminated iron core can be made into one type, and it is possible to suppress deterioration of workability in the pressing process of pressing the arc-shaped iron core pieces and the laminating process of laminating the arc-shaped iron core pieces. , The yield of material (magnetic steel plate) can be improved (reduction of waste material after pressing).

Further, in the first embodiment, the configuration in which the laminated iron core main body 16 has 16 poles has been described, but the present invention is not limited to this, and the number of magnetic poles of the laminated iron core main body 16 can be appropriately changed. Further, in the first embodiment, the configuration has been described as having the same number of welded portions 18 as the number of magnetic poles of the laminated iron core main body 16, but the present invention is not limited to this, and the laminated iron core of the present invention is a welded portion of the laminated iron core main body. The number of can be changed as appropriate. For example, a welded portion having half the number of magnetic poles of the laminated iron core body may be provided.

Further, in the first embodiment, the welded portion 18 and the magnet mounting portion 20 have been described as being provided on opposite sides to each other via the guide hole 24, but the present invention is not limited to this, and welding is performed on the laminated iron core body. The portion and the guide hole may be provided so as to be offset in the circumferential direction of the arcuate iron core piece.

Further, in the first embodiment, the welded portion 18 of the laminated iron core main body 16 has been described as being provided on the inner peripheral portion of the laminated iron core main body 16, but the present invention is not limited to this, and the welded portion is the laminated iron core main body. The configuration may be provided on the outer peripheral portion.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof. Further, it goes without saying that the scope of rights of the present invention is not limited to the above-mentioned first embodiment, second embodiment and modified examples.

10 Laminated iron cores 12, 80, 80A Arc-shaped iron core pieces 13, 84, 84A, 88, 88A End faces 14A, 14B, 14C Circular iron core pieces 16 Laminated iron core bodies 26, 90, 90A Joint 30 Single plate with carrier 28, 98 joints Part 82, 86A, 94, 96A Convex part 82A, 86, 94A, 96 Concave part

Claims (6)

A press process that manufactures a plurality of arcuate iron core pieces by pressing a magnetic steel plate, and
A laminating step of manufacturing a laminated core body by arranging the arc-shaped iron core pieces in an annular shape to form an annular core piece and laminating a plurality of the annular core pieces with a phase shift in the circumferential direction.
In the annular core pieces of each layer that are out of phase in the circumferential direction of the laminated iron core body, the arcuate core pieces adjacent to each other in the stacking direction are welded to each other, and the circumference of the annular core pieces at the laminated direction end of the laminated iron core body. A welding process in which the arcuate core pieces adjacent to each other in the direction are welded and joined together.
A method for manufacturing a laminated iron core of a vehicle drive motor having the above. At the stacking direction end of the laminated iron core body, a convex portion protruding in the circumferential direction is formed on one of the arcuate core pieces adjacent in the circumferential direction, and the arcuate core piece adjacent in the circumferential direction On the other hand, the method for manufacturing a laminated iron core of a vehicle driving motor according to claim 1, wherein a concave portion into which the convex portion is fitted is formed. At the stacking direction end of the laminated iron core body , a plurality of the convex portions are formed in the radial direction on one of the arcuate core pieces adjacent in the circumferential direction, and the other of the arcuate core pieces adjacent in the circumferential direction. The method for manufacturing a laminated iron core of a vehicle driving motor according to claim 2, wherein a plurality of the concave portions into which each of the convex portions is fitted are formed in the radial direction. A laminated iron core body in which a plurality of annular iron core pieces formed by arranging a plurality of arcuate iron core pieces using a magnetic steel plate in an annular shape are laminated with their phases shifted in the circumferential direction.
In the annular core pieces of each layer that are out of phase in the circumferential direction of the laminated core body, the welded portion in which the arcuate core pieces adjacent to each other in the stacking direction are welded together.
In the annular core piece at the end in the stacking direction of the laminated iron core body, a joint portion in which the arcuate core pieces adjacent to each other in the circumferential direction are welded and joined,
A laminated iron core of a vehicle drive motor having. One of the arcuate core pieces which are joined at the junction protrusion that protrudes in the circumferential direction is formed on the other of the arcuate core pieces which are joined at the joint portion, the convex portion The laminated iron core of the vehicle driving motor according to claim 4, wherein the fitted recess is formed. A plurality of the convex portions are formed in the radial direction on one of the arc-shaped iron core pieces joined at the joint portion, and each of the convex portions on the other of the arc-shaped iron core pieces joined at the joint portion. The laminated iron core of the vehicle driving motor according to claim 5, wherein a plurality of the recesses to which the motors are fitted are formed in the radial direction.

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