JP2005130571A - Laminated core, manufacturing method therefor, and rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small laminated core where a plurality of core sheets are integrated by engaging caulking parts, that provides proper flatness at its end phase, correcting rising of teeth of core sheets at the end phase. <P>SOLUTION: A caulking part 17 of a first core piece 20 comprises a hole 21, and the caulking part 17 of a second piece 22 has a protruding part 23 on one side, while has a recess 24 on the side opposite to the protruding part 23. The protruding part 23 of the second core piece 22 is engaged with the hole 21 of the first core piece 20, while the protruding part 23 of the adjoining second core piece 22 is engaged with the recess 24 of the second core piece, thus the protruding part 23 and the recess 24 of the second core piece 22 are engaged each other in order, integrating a laminated core 8. Lifting of teeth 15 of such a first core piece 20 among the teeth 15 of the first core piece 20, as provided on the surface on the second core piece 22 side, is corrected by a drive part 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a laminated iron core in which a plurality of iron core pieces are integrated by a caulking portion provided on the iron core piece, a method for manufacturing the same, and a rotating electrical machine including the laminated iron core.

  In a conventional laminated core, in a stator core that forms a laminated core by laminating a plurality of cores consisting of a plurality of slots for inserting a coil and a plurality of teeth portions and a core back portion that form a magnetic circuit, Since the strength of the teeth portion can be improved by providing a protrusion between the substantially central portion of the plurality of tooth portions and the substantially central portion of the core back portion, the core due to the coil insertion force generated during the winding operation of the stator There are some which prevent the deformation of the teeth and the lifting of the teeth (for example, see Patent Document 1).

JP-A-5-103436 (page 2-3, FIG. 1-5)

  In the conventional laminated core, a protrusion is provided between the substantially central part of the teeth part and the substantially central part of the core back part to improve the strength of the tooth part, and the core is deformed by the coil insertion force generated during winding work. The teeth width is increased in order to provide the protrusions, and the dimension in the stacking direction is increased by providing the protrusions, and the flatness of the end face of the stacked core is increased. There were problems such as worsening. In addition, in the laminated iron core in which a plurality of iron core pieces are integrated by fitting the caulking portion provided on the iron core piece (core), the teeth of the iron core piece particularly located on the end surface are lifted, and there is a gap in the lamination direction. There was a problem that the flatness of the end face of the laminated iron core deteriorated.

The present invention has been made in order to solve the above-described problems, and a first object thereof is to correct the lift of the teeth of the iron core piece on the end face of the laminated iron core, so that the flatness of the end face of the laminated iron core is corrected. To obtain a compact and compact laminated iron core.
The second object is to obtain a method of manufacturing a laminated core with good productivity by correcting the lift of the teeth of the core piece on the end face of the laminated core, and having good flatness of the end face of the laminated core.
The third object is to obtain a rotating electrical machine having a laminated core with good flatness, which can easily improve the flatness of the end face of the laminated core.

  The present invention includes a plurality of slots for accommodating coils, a plurality of teeth portions positioned between the plurality of slots, a connecting portion connecting the plurality of teeth portions, and a caulking portion provided in the connecting portion. A laminated iron core in which a plurality of the iron core pieces are integrated by fitting the caulking portion to the iron core piece, the caulking portion of the first iron core piece having a hole, and the caulking portion of the second iron core piece. The portion has a convex portion on one surface, and a concave portion on the surface opposite to the convex portion, and the convex portion of the second iron core piece is fitted into the hole portion of the first iron core piece, In the laminated iron core in which the concave portions and the convex portions of the second iron core pieces are sequentially fitted and integrated into the concave portions of the second iron core pieces so as to fit the convex portions of the adjacent second iron core pieces. The second iron core piece is provided on the side of the teeth, and the first iron core piece is lifted It is those with a driving part to correct.

  An iron core piece comprising a plurality of slots for accommodating coils, a plurality of teeth positioned between the plurality of slots, a connecting portion for connecting the plurality of teeth, and a caulking portion provided in the connecting portion. Are formed by sequentially punching from a strip-shaped plate material in a mold, and the plurality of iron core pieces are integrated by fitting the caulking part, and the caulking part of the first iron core piece is a hole part. The caulking portion of the second iron core piece has a convex portion on one surface, and a concave portion on the surface opposite to the convex portion, and the hole portion of the first iron core piece and the second The convex part of the iron core piece is fitted, and the concave part of the second iron core piece is fitted into the concave part of the second iron core piece, and the concave part and the convex part of the second iron core piece are sequentially fitted to be integrated. In the method for manufacturing a laminated iron core, the ferrous iron is provided before the step of punching the outer diameter of the first iron core piece. Of tooth piece, said first core piece is obtained comprising the step of forming the implant portion to the surface of the I is a second core pieces adjacent.

  Further, in the rotating electric machine having a shaft core in which a plurality of laminated cores are arranged side by side in the axial direction, the core pieces on both end surfaces of the shaft core are provided with the first core pieces provided with teeth. Is.

  According to this invention, since the second iron core piece of the first iron core piece has the driving portion for correcting the lifting of the first iron core piece on the surface of the wing, the second iron core piece is adjacent to the adjacent second iron core piece. There is an effect that the gap is reduced, and the flatness of the end face of the laminated core is good and a small laminated core is obtained.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS. In the following description, the same or corresponding parts in the drawings are denoted by the same reference numerals. FIG. 3 is a cross-sectional view of the electric power steering apparatus motor. In FIG. 3, the motor 1 for an electric power steering device that constitutes a rotating electric machine has an armature 4 disposed on the inner peripheral side of a permanent magnet 3 fixed to the inner surface of a yoke 2 via a predetermined gap. The shaft 5 of the child 4 is rotatably supported by bearings 6 and 7. The armature 4 includes a coil 10 wound around a slot 9 of a laminated iron core 8 made of an electromagnetic steel plate fixed to a shaft 5. The brush 12 is in sliding contact with the commutator 11 fixed to the shaft 5, and the coil 10 is supplied with power from the lead wire 13 through the brush 12 and the commutator 11.

  FIG. 4 is a cross-sectional view of the shaft core shown in FIG. 3. In the shaft core 14, the laminated core 8 is fixed to the shaft 5 by press-fitting. The laminated iron core 8 is configured by arranging three laminated iron cores 8 integrated in parallel in the axial direction. The commutator 11 is press-fitted into the shaft core 14 of FIG. 4, the coil 10 is wound across the slots 9, and the coils 10 positioned on both end faces of the laminated core 8 are moved to the bottom of the slot 9 with a jig. The coil 10 is arranged in the slot 9 with high density while being pushed in sequentially, and the coil 10 is connected to the commutator 11 to constitute the armature 4.

  FIG. 5 is a front view of the laminated iron core as viewed from A of FIG. 21 slots 9 for accommodating the coil 10, 21 teeth 15 positioned between the slots 9, a connecting portion 16 for connecting the teeth 15, and a caulking portion 17 provided in the connecting portion 16 For example, 40 pieces of the iron core 18 are integrated by fitting the caulking portion 17 to the iron core piece 18 provided with. The teeth 15 do not include the caulking portion 17, and are open slots having openings between adjacent teeth 15. The caulking portion 17 has an oval shape formed concentrically with the shaft center, whereby the iron core pieces 18 are sequentially fitted by the caulking portion 17 while rotating in a predetermined angle rotation direction, and the skewed laminated iron core 8 is skewed. Is formed. A shaft hole 19 is provided inside the connecting portion 16, and the three laminated cores 8 are juxtaposed and fixed by press-fitting the shaft 5 into the shaft hole 19.

  FIG. 1 is a cross-sectional view of main parts of a caulking portion and a driving portion, taken along a line BB in FIG. The caulking portion 17 of the first iron core piece 20 located at one end of the laminated iron core 8 has a hole 21, and the caulking portion 17 of the second iron core piece 22 adjacent to the first iron core piece 20 is on one side. The convex portion 23 is provided on the opposite side of the convex portion 23, and the convex portion 23 of the second iron core piece 22 is fitted in the hole portion 21 of the first iron core piece 20. The concave core 24 of the second iron core piece 22 is sequentially fitted into the concave portion 24 of the second iron core piece 22 so that the concave core 24 and the convex portion 23 of the second iron core piece 22 are sequentially fitted. Has been. Of the teeth 15 of the first iron core piece 20, a second iron core piece 22 has a driving portion 25 on the surface of the first iron core piece 20 that serves as a correction means against the lifting of the teeth 15 of the first iron core piece 20. The tip of the tooth 15 of the first core piece 20 is corrected so as to be bent in a U-shape starting from the driving portion 25 so that the gap between the adjacent second core pieces 22 is reduced.

  When the driving portion 25 is not provided, as shown by a broken line in FIG. 1, the gap between the tooth 15 of the first iron core piece 20 and the adjacent second iron core piece 22 as it goes to the tip of the tooth 15. And a gap of, for example, about 0.3 mm is generated between the adjacent second core pieces 22 at the tip of the tooth 15. This is because the convex portion 23 is fitted from the adjacent second core piece 22 side to the hole portion 21 of the first core piece 20 located on the end surface, so that the teeth 15 of the first core piece 20 are in the above direction. Because the floating stress acts, the teeth 15 near the hole 21 having a low rigidity are particularly likely to float.

  FIG. 2 is a front view of the first iron core piece on the driving portion side viewed from C in FIG. 1. The driving portion 25 in which the second core piece 22 of the teeth 15 of the first core piece 20 is provided on the side of the first core piece 20 is provided in a straight line substantially perpendicular to the direction in which the teeth 15 extend toward the tip. Yes. The driving portion 25 is formed in the tooth 15 positioned in the vicinity of the oval hole 21 of the first iron core piece 20, and in FIG. 2, 3 positioned in the vicinity of one hole 21. The driving portions 25 are formed in the individual teeth 15, and the driving portions 25 are formed in the nine teeth 15 in total with respect to the three hole portions 21. The driving portion 25 is formed with three parallel-line driving portions 25 with respect to one tooth 15.

  FIG. 6 is an explanatory view of a main part of the driving unit shown in FIG. The depth t of the driving portion 25 provided in the first iron core piece 20 is a depth corresponding to the size of the dripping generated in the teeth 15 by the punching of the slot 9. By punching a steel sheet, the shear cut surface is usually composed of four parts: a droop, a shear plane, a fracture surface, and a burr, but the droop is a free surface part that is squeezed when the tool bites. The depth t of the driving portion 25 is configured as a depth corresponding to the size of the drooping portion. In the present embodiment, the plate thickness T of the first iron core piece 20 is 0.5 mm, and the depth t of the driving portion 25 is 0.05 mm. That is, the depth t is about 10% of the plate thickness T. Moreover, the cross-sectional shape of the driving | running | working part 25 is V shape, and is comprised by three.

  In FIG. 4, the iron core pieces 18 positioned on both end surfaces of the shaft iron core 14 are provided with the first iron core pieces 20 including the driving portions 25 as described above. Three of the same laminated cores 8 are arranged side by side in the axial direction, and the direction of the laminated core 8 is set so that the first core pieces 20 provided with the driven portions 25 are disposed on the teeth 15 at both end faces. It is fixed and press-fitted into the shaft 5.

  Next, the operation will be described. In the motor 1 for an electric power steering apparatus, the armature 4 is fed from a lead wire 13 connected to a control device (not shown) via a brush 12, and the armature 4 generates a rotational force by electromagnetic action with the magnet 3. Thus, the electric power steering device motor 1 can assist the steering force by this rotational force.

  As described above, in the first embodiment, since the second core piece 22 of the teeth 15 of the first core piece 20 includes the driving portion 25 on the side of the flange, the first iron core piece 20 has the driving portion 25 as a starting point. The teeth 15 of the one iron core piece 20 are bent to the second iron core piece 22 side, the lift of the teeth 15 on the end face of the laminated iron core 8 is corrected, the gap between the adjacent second iron core pieces 22 is reduced, and the laminated iron core is reduced. Thus, it is possible to obtain a small laminated iron core 8 with a flatness of the end face 8. Further, the protrusion on the opposite surface of the driving portion 25, that is, the end surface of the laminated core 8, is free from protrusions associated with the driving portion 25, and the laminated core 8 having good flatness can be obtained. Further, the influence of the driving portion 25 on the magnetic properties of the laminated core 8 is not problematic.

  The driving portion 25 is provided at a substantially right angle to the direction in which the tooth 15 extends toward the tip of the tooth 15, so that the width dimension of the tooth 15 does not increase as in the case where the protrusion is provided on the tooth 15. 15 is easily corrected, and a small laminated core 8 with good flatness can be obtained. In addition, since the front-end | tip of the teeth 15 will shift | deviate and correct | amend as the driving | running | working part 25 deviates from the said right angle, it is better to provide as much as possible at right angles. Since it is the linear driving | running | working part 25, it bends easily and is corrected effectively. The radial position of the driving portion 25 provided on the tooth 15 is preferably provided at a position where lifting can be effectively suppressed.

  Since the driving portion 25 is formed at least in the tooth 15 located in the vicinity of the hole portion 21 of the first iron core piece 20, the teeth 15 are easily lifted in the vicinity of the hole portion 21 having low rigidity. Since it is corrected, a small laminated iron core 8 with good flatness can be obtained effectively.

  Since the depth of the driving portion 25 is a depth equal to or less than the size of the sag generated in the teeth 15 by the punching of the slot 9, the influence of the driving portion 25 does not reach the end face side, and the flatness of the end face is good. Further, the protrusion to the slot 9 side due to the provision of the driving portion 25 is absorbed by the extracted portion, and the laminated iron core 8 that does not protrude from the tooth 15 toward the slot 9 can be obtained. Further, the influence of the driving portion 25 on the magnetic properties of the laminated core 8 is not problematic. In addition, when the depth of the driving | running | working part 25 is extremely shallow, since the correction effect with respect to the floating of the teeth 15 reduces, the depth of the driving | running | working part 25 is determined in consideration of this.

  Since the driving portion 25 is formed of a plurality of pieces, the lifting of the teeth 15 is effectively corrected and the driving portion 25 is provided even when the depth of the driving portion 25 is relatively shallow. Thus, the protrusion in the direction of the slot 9 and the influence on the flatness are further suppressed, and a small laminated core 8 with good flatness can be obtained.

  Since the cross-sectional shape of the driving portion 25 is V-shaped, even if the depth of the driving portion 25 is relatively shallow, the bending portion 25 is effectively bent, the lift of the teeth 15 is corrected, and the small size with good flatness. The laminated iron core 8 can be obtained.

  The caulking portion 25 has an oval shape formed concentrically with the shaft center, and the accuracy of the caulking portion 25 is likely to be reduced, or the rigidity of the hole portion 21 of the first iron core piece 20 is likely to be reduced. By providing, the floating of the teeth 15 is effectively corrected, and the laminated iron core 8 having good flatness, small size, and skew can be obtained. It should be noted that a skew provided as described in the background art cannot be easily skewed.

  In the one provided with the shaft core 14 in which a plurality of laminated iron cores 8 are arranged in the axial direction, the core pieces 18 on both end faces of the shaft core 14 are provided with first driven portions 25 provided on the teeth 15. Since the iron core piece 20 is disposed, the flatness of both end faces of the shaft iron core 14 can be easily improved, and a rotating electrical machine including the laminated core 8 with good flatness can be obtained. Since the flatness of the end face is good, the coil 10 can be pushed into the slot 9 with high density, and a small-sized and high-performance rotating electrical machine can be obtained.

Embodiment 2. FIG.
The second embodiment will be described with reference to FIGS. FIG. 7 is an explanatory diagram of the manufacturing process of the laminated iron core. For example, an example in which a laminated steel core 8 in which a strip-shaped steel plate 26 having a plate thickness of 0.5 mm is sequentially fed through the mold and integrated last is manufactured in seven steps is shown. The step (a) is a step of punching the pilot pin hole 27, and the step (b) is a step of punching the slot 9. The step C is a step of forming the driving portion 25, and includes a step of punching the three holes 21 in the connecting portion 16 after the step of forming the driving portion 25. The step (e) is a step for forming the convex portion 23 and the concave portion 24, and the step (f) is a step for punching the shaft hole 19. In the step, the outer diameter d of the iron core piece 18 (the first iron core piece 20 or the second iron core piece 22) is punched from the steel plate 26, and the teeth 15 are separated from the steel plate 26. Each punching is performed by moving the punch from the top to the bottom in the drawing. The first iron core piece 20 is a process of the above-mentioned a, b, c, d, f, and g, and the second iron core piece 22 is a process of a, b, h, f, h, g, respectively, and the process is selectively performed. It is formed by carrying out. For example, when 30 core pieces 18 are integrated to form a laminated core 8, first, the first iron core piece 20 is formed, and the second to 30th iron core pieces 22 are formed. FIG. 7 illustrates a process in which the first iron core piece 20 is formed.

  FIG. 8 is a cross-sectional view of the main part of the driving portion obtained by cross-sectioning the steel plate 26 of FIG. 7 along DD. When forming the driving portion 25 in the step C, the driving mold moves from the top to the bottom in the drawing, and the driving portion 25 having an angle of, for example, 90 degrees is formed on one surface of the steel plate 26. The steel plate 26 is formed at a depth of about 10% of the plate thickness. At this time, the surface of the steel plate 26 on the side opposite to the driving portion is formed so that the driving portion 25 is formed while being supported by a flat surface, and the driving portion 25 side is slightly depressed. One driving portion 25 is formed substantially perpendicular to the direction in which the teeth 15 extend, and the driving portions 25 are formed in three teeth 15 respectively corresponding to the positions of the three hole portions 21. In the step of forming the hammered-in portion 25, internal stress is applied to correct the lifting of the teeth 15, and driving is performed until the outer diameter of the first iron core piece 20 is punched from the steel plate 26 in the step of G. The teeth 15 forming the portion 25 are connected to the steel plate 26, and the internal stress due to the driving portion 25 remains.

  FIG. 9 is an explanatory diagram of a lamination process of iron core pieces. In the process of FIG. 7, the iron core piece 18, which has been punched out from the steel plate 26 by punching the outer diameter with an outer diameter cutting die arranged in the lower direction of the drawing in the drawing, At the same time, the caulking portion 17 is fitted. A cylindrical squeeze ring 27 shown in FIG. 9 that is integral with the outer diameter cutting die is disposed below the outer diameter cutting die. Since the inner diameter dimension of the squeeze ring 27 is slightly smaller than the outer diameter dimension of the iron core piece 18, the iron core piece 18 is held on the inner peripheral surface of the squeeze ring 27 and is sequentially punched into the squeeze ring 27. The iron core pieces 18 are sequentially pushed out from the squeeze ring 27, so that one integrated laminated iron core 8 can be obtained continuously. If the caulking portion 17 has an oval shape and is configured to be sequentially fitted while rotating the squeeze ring 27 by a predetermined angle, the skewed laminated iron core 8 of the first embodiment can be obtained.

  FIG. 10 is a front view of the laminated iron core manufactured by the above process. The circular convex portion 23 of the second iron core piece 22 is fitted into the circular hole portion 21 of the first iron core piece 20, and thereafter the convex portion 23 is formed in the concave portion 24 of the second iron core piece 22 until the predetermined number is reached. In this case, the laminated iron core 8 is formed by integrating the 30 iron core pieces 18. In addition, since the caulking part 17 of the 1st iron core piece 20 is the hole 21 by forming the 1st iron core piece 20 when it becomes a predetermined number of sheets, it fits into the recessed part 24 of the 2nd iron core piece 22 before that. Therefore, the laminated iron core 8 integrated with a predetermined number of sheets can be continuously manufactured.

  FIG. 11 is a cross-sectional view of the main part of the laminated iron core obtained by crossing the laminated iron core of FIG. 10 along EE. The convex portion 23 of the second iron core piece 22 is fitted into the hole portion 21 of the first iron core piece 20, and then the convex portion 23 is fitted into the concave portion 24 of the second iron core piece 22 until the predetermined number is reached. In this case, the laminated iron core 8 is formed by integrating 30 iron core pieces 18. The lift of the teeth 15 is corrected by a V-shaped driving portion 25 provided on the teeth 15 of the first core piece 20 on one end face of the laminated core 8. The teeth 15 of the second core piece 22 on the other end surface of the laminated core 8 are lifted up when the second core piece 22 is pushed out of the squeeze ring 27. The laminated iron core 8 is lifted because of its own weight.

  As described above, in the second embodiment, the plurality of slots 9 that house the coil 10, the plurality of teeth 15 that are located between the plurality of slots 9, and the connecting portion that connects the plurality of teeth 15. 16 and the caulking portion 17 provided on the connecting portion 16 are sequentially punched from the strip-shaped steel plate 26 in the mold, and a plurality of sheets are fitted by fitting the caulking portion 17 together. The iron core piece 18 is integrated, and the caulking portion 17 of the first iron core piece 20 has a hole portion 21, and the caulking portion 17 of the second iron core piece 22 has a convex portion 23 on one side surface thereof. In the manufacturing method of the laminated core 8 which has the recessed part 24 in the surface on the opposite side of the convex part 23, and fits the hole part 21 of the 1st iron core piece 20, and the convex part 23 of the 2nd iron core piece 22. FIG. Before the step (g) of punching the outer diameter of the first iron core piece 20 Of the teeth 15 of the first iron core piece 20, the second iron core piece 22 adjacent to the first iron core piece 20 includes the step (c) of forming the driving portion 25 on the side of the hook. The direction in which the tooth 15 of the first core piece 20 punched out of the outer diameter and cut off from the steel plate 26 is easy and productive, and the clearance between the adjacent second core pieces 22 is reduced by the residual stress of the driving portion 25. Thus, it is possible to obtain a method of manufacturing the laminated core 8 that is straightened and has good flatness and good productivity.

  Since the step (c) of forming the driving portion 25 is performed in a step before the step of forming the caulking portion 17 (d and e), the dimensional accuracy of the caulking portion 17 by forming the driving portion 25 is improved. Since there is no influence and the fitting accuracy of the caulking portion 17 is good, a method for manufacturing the laminated core 8 with good flatness can be obtained. Further, since the driving portion 25 is linear, the driving die may have a simple structure and maintenance is easy.

  In addition, since the caulking portion 17 is formed in a separate process, the fitting of the hole portion 21 of the first core piece 20 and the convex portion 23 of the second core piece 22 may not be stable. Although the teeth 15 of the first iron core piece 20 are easily lifted, by providing the driving portion 25, it is possible to obtain a method of manufacturing the laminated iron core 8 with improved flatness and improved flatness.

  In addition, even when the tooth 15 of the second core piece 22 on the end surface opposite to the first core piece 20 is lifted as shown in FIG. 11, the tooth 15 can be corrected by providing the driving portion 25. . However, in this case, it is necessary to move the above-mentioned driving mold from the bottom to the top in FIG. 7, which complicates the apparatus. When arranging a plurality of laminated cores 8 side by side, the first core pieces 20 provided with the driving portions 25 may be disposed on both end faces as described above.

  In addition, about the part corresponding to the laminated core 8 of Embodiment 1, there exists an effect similar to the laminated core 8 of Embodiment 1. FIG.

Embodiment 3 FIG.
The third embodiment will be described with reference to FIGS. FIG. 12 is a front view of a laminated iron core used for a stator such as a brushless motor. The laminated iron core 8 includes six slots 9 for accommodating coils, six teeth 15 positioned between the slots, a connecting portion 16 for connecting the teeth 15, and a caulking portion provided in the connecting portion 16. And a predetermined number of core pieces 18 are integrated by fitting the caulking portion 17 into the core pieces 18. It extends to the circumferential side.

  FIG. 13 is a cross-sectional view of the main part of the laminated core in which the laminated core shown in FIG. The caulking portion 17 of the first iron core piece 20 has a hole portion 21, and the caulking portion 17 of the second iron core piece 22 has a convex portion 23 on one surface and a concave portion 24 on the surface opposite to the convex portion 23. The convex portion 23 of the second iron core piece 22 is fitted into the hole portion 21 of the first iron core piece 20, and the convexity of the adjacent second iron core piece 22 is fitted in the concave portion 24 of the second iron core piece 22. As the portion 23 is fitted, the concave portion 24 and the convex portion 23 of the second iron core piece 22 are sequentially fitted, and a predetermined number of the iron core pieces 18 are integrated. Of the teeth 15 of the first iron core piece 20, the second iron core piece 22 is provided with a driving portion 25 having an R shape with a sharp cross-sectional shape of the driving portion 25. The lift of teeth 15 is corrected.

  FIG. 14 is a front view of the first iron core piece driven-in side as viewed from G in FIG. 13. The six teeth 15 of the first iron core piece 20 are provided with a total of six linear driving portions 25, one each, substantially perpendicular to the direction in which the teeth 15 extend.

  As described above, the third embodiment is related to the laminated iron core 8 of the stator in which the teeth 15 extend to the inner peripheral side as compared with the first and second embodiments. Similar effects can be obtained with respect to the parts corresponding to those in the first and second embodiments.

It is principal part sectional drawing of the crimping part and driving | running | working part which show Embodiment 1 of this invention. It is a front view by the side of the driving | running | working part of the 1st iron core piece which shows Embodiment 1 of this invention. It is sectional drawing of the motor for electric power steering apparatuses which shows Embodiment 1 of this invention. It is sectional drawing of the shaft iron core which shows Embodiment 1 of this invention. It is a front view of the laminated iron core which shows Embodiment 1 of this invention. It is principal part explanatory drawing of the drive part which shows Embodiment 1 of this invention. It is explanatory drawing of the manufacturing process of the laminated iron core which shows Embodiment 2 of this invention. It is principal part sectional drawing of the drive part which shows Embodiment 2 of this invention. It is explanatory drawing of the lamination process of the iron core piece which shows Embodiment 2 of this invention. It is a front view of the laminated iron core which shows Embodiment 2 of this invention. It is principal part sectional drawing of the laminated iron core which shows Embodiment 2 of this invention. It is a front view of the laminated iron core which shows Embodiment 3 of this invention. It is principal part sectional drawing of the laminated iron core which shows Embodiment 3 of this invention. It is a front view by the side of the driving | running | working part of the 1st iron core piece which shows Embodiment 3 of this invention.

Explanation of symbols

8 laminated iron cores, 9 slots, 14 shaft iron cores, 15 teeth, 16 connecting parts, 17 caulking parts, 18 iron core pieces, 20 first iron core pieces, 21 holes, 22 second iron core pieces, 23 convex parts, 24 concave parts, 25 Driving part, 26 steel plate.

Claims (10)

An iron core piece comprising a plurality of slots for accommodating coils, a plurality of teeth positioned between the plurality of slots, a connecting portion for connecting the plurality of teeth, and a caulking portion provided in the connecting portion. A laminated iron core in which a plurality of the iron core pieces are integrated by fitting the caulking part, the caulking part of the first iron core piece having a hole, and the caulking part of the second iron core piece is one side A convex portion on the surface, and a concave portion on the surface opposite to the convex portion, and the convex portion of the second iron core piece is fitted in the hole of the first iron core piece, and the second iron core Of the teeth of the first core piece, in the laminated core in which the concave portion and the convex portion of the second iron core piece are sequentially fitted and integrated into the concave portion of the piece so as to fit the convex portion of the adjacent second iron core piece. The second iron core piece is provided on the side of the wafer and corrects the lifting of the teeth of the first iron core piece. A laminated core, characterized in that it comprises only part. The laminated iron core according to claim 1, wherein the driving portion is provided at a substantially right angle to a direction in which the tooth extends toward the tip of the tooth. The laminated core according to claim 1, wherein the driving portion is formed in a tooth positioned at least in the vicinity of the hole portion of the first iron core piece. 4. The laminated iron core according to claim 1, wherein a depth of the driving portion is a depth equal to or less than a size of a dripping generated in the teeth by punching the slot. 5. The laminated core according to any one of claims 1 to 4, wherein a plurality of driving portions are formed. The laminated core according to any one of claims 1 to 5, wherein a cross-sectional shape of the driving portion is a V shape. The laminated iron core according to any one of claims 1 to 6, wherein the caulking portion has an oval shape formed concentrically with the shaft center. An iron core piece comprising a plurality of slots for accommodating coils, a plurality of teeth positioned between the plurality of slots, a connecting portion for connecting the plurality of teeth, and a caulking portion provided in the connecting portion, A plurality of iron core pieces are integrated by stamping and forming from a strip-shaped steel plate in a mold in sequence, and the caulking portion of the first iron core piece has a hole. The caulking portion of the second iron core piece has a convex portion on one surface and a concave portion on the surface opposite to the convex portion, and the hole portion of the first iron core piece and the second iron core piece The convex part of the second core piece is fitted and integrated into the concave part of the second core piece by sequentially fitting the concave part and convex part of the second core piece in order to fit the convex part of the adjacent second core piece. In the manufacturing method of the iron core, before the step of punching the outer diameter of the first iron core piece, Of Isu, method for manufacturing a laminated core, characterized in that said first core piece comprising a step of forming an implant portion on the surface of the I is a second core pieces adjacent. The method for manufacturing a laminated core according to claim 8, wherein the step of forming the driving portion is performed in a step before the step of forming the caulking portion. 2. A rotating electrical machine having a shaft core in which a plurality of laminated cores according to claim 1 are arranged side by side in the axial direction, wherein the core pieces on both end faces of the shaft core are provided with a first core piece provided with teeth. Rotating electric machine characterized by being made.

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