JP2018061348A - Manufacturing method of stator core, stator core manufacturing apparatus, and stator core piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a stator core of a rotary electric machine to which a skew is applied at low cost.SOLUTION: A manufacturing method of a stator core of the present invention is for manufacturing a stator core 1 by using a first jig 50 and a second jig 60. The first jig 50 comprises a plurality of guide poles 51. Each guide pole 51 comprises a guide surface 55 contacted to an external edge part 11 of a stator core piece 10 constituting the stator core 1, and a guide groove 56 or a guide projecting line 56'. The guide groove 56 or the guide projecting line 56' are engaged with a projection part 14 or a convex part 14' formed in the stator core piece 10. The stator core pieces 10 included in some layers of the stator core pieces 10 constituting a stator core main body 20 is overlapped by using the first jig 50. An inner edge part 12 of at least a part of the stator core pieces 10 rotates the second jig 60 in a vertical axial rotation in a state of being energized by energizing means of the second jig 60.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a method for manufacturing a stator core of a rotating electrical machine such as an electric motor or a generator, a stator core manufacturing apparatus that manufactures a stator core, and a stator core piece that constitutes the stator core.

  In a rotating electrical machine such as an electric motor or a generator, a skew is applied to a stator core of the rotating electrical machine for the purpose of suppressing torque ripple generated during operation. One method of skewing the stator core is to form a stator core by laminating annular members made of electromagnetic steel sheets, and to remove each annular member except for the lowermost annular member, The so-called pseudo-skew effect is imparted to the stator core by stacking the annular member positioned in the circumferential direction while being shifted in the circumferential direction (that is, around the center axis of the stator core).

  In Patent Document 1, an annular member is divided into a plurality of fan-shaped stator core pieces (divided cores), and the stator core pieces are laminated one by one to form a plurality of blocks. A method for manufacturing a stator core is disclosed in which a substantially cylindrical stator core is produced by connecting in a ring shape. When forming each block, each stator core piece excluding the lowermost stator core piece is stacked by being shifted at a predetermined angle in the circumferential direction with respect to the stator core piece located immediately below it, Skew is imparted to a stator core configured by combining a plurality of blocks. Since the stator core pieces are lighter than the annular member, the process of stacking the stator core pieces can be performed more easily than the process of stacking the annular members. In this respect, the stator core manufacturing method disclosed in Patent Document 1 is preferable for manufacturing a large stator core.

JP 2005-278298 A

  In the method for manufacturing a stator core disclosed in Patent Document 1, blocks are manufactured one by one using a skew forming device provided with a key or the like that fits into a slot formed in a stator core piece, and It is necessary to take out from the apparatus, and further, it is necessary to weld a plurality of manufactured blocks outside the skew forming apparatus and weld joints between the blocks. Such work is troublesome, and particularly when the weight of the block is large, it becomes a heavy work burden.

  Furthermore, in the method of manufacturing a stator core disclosed in Patent Document 1, a crimp for preventing displacement is formed on the stator core piece. By providing such a crimp on the stator core piece, The cost of the mold used for forming the stator core piece from the electromagnetic steel sheet as a raw material increases. The upper and lower adjacent stator core pieces are crimped so as to be displaced in the circumferential direction, and the key section of the skew forming device has a cross-sectional size that is the size of the slot formed in the stator core piece. Therefore, in the method for manufacturing a stator core disclosed in Patent Document 1, the positioning of the stator core pieces in the circumferential direction becomes insufficient, and a considerable amount of time is required when the blocks are combined. There is a risk that a gap will occur.

  The present invention has been made in view of the above problems, and includes a stator core body configured by laminating a plurality of stator core pieces arranged in an annular shape, to which a skew is imparted. A stator core manufacturing method, a stator core manufacturing apparatus, and a stator core capable of arranging a stator core piece of a rotating electrical machine more easily and at a lower cost than in the prior art, and with higher accuracy of stator core pieces. Provide a piece.

  The method for manufacturing a stator core according to the present invention includes a stator core body configured by laminating a plurality of stator core pieces arranged in an annular shape, and includes a substantially cylindrical rotating electric machine having a skew. A stator core manufacturing method for manufacturing a stator core, wherein the stator core piece is formed in a substantially fan shape, and an arcuate outer edge portion of the stator core piece defining an outer peripheral surface of the stator core body Is formed with a convex portion or a concave portion, the stator core piece is positioned using the first jig and the second jig, and the first jig includes a plurality of guide columns, The guide column is formed on the guide surface that comes into contact with the outer edge of the stator core piece, and the guide groove that is formed in the guide groove into which the convex portion of the stator core piece fits or the concave portion of the stator core piece. The guide groove or the guide ridge is formed in a spiral shape and extends vertically. The plurality of guide columns are erected apart from each other in the circumferential direction with the guide surface facing inward, and the second jig protrudes outward from the barrel body and the barrel section. And a biasing means having one or a plurality of members biased outward, and the second jig is positioned on the guide surface side of the plurality of guide pillars. The stator core pieces that are arranged and configured to be rotatable around the vertical axis and are stacked in several layers of the stator core pieces constituting the stator core body are stacked using a first jig. In the state where the inner edge of at least a part of the stator core pieces stacked using the first jig and the first jig is urged by the urging means of the second jig, A second step of rotating the tool about a vertical axis.

  In the method for manufacturing a stator core according to the present invention, the second jig is configured to be movable up and down in the vertical direction, and the second step may include a step of rotating the second jig while raising it.

  In the method for manufacturing a stator core of the present invention, the first step and the second step may be alternately repeated a plurality of times.

  In the stator core manufacturing method according to the present invention, after a plurality of stator core pieces constituting the uppermost layer of the stator core body are stacked using the first jig, the stator core pieces are moved downward. Pressing may be included.

  In the stator core manufacturing method of the present invention, the second jig is rotated about the vertical axis by a predetermined angle in the direction opposite to the rotation direction in the second step in a state where the second jig is in contact with the stator core piece. A third step of rotating may be included.

  In the method for manufacturing a stator core according to the present invention, the plurality of guide columns are arranged in a circumferential direction from the plurality of first guide columns, and the plurality of first guide columns are arranged in the circumferential direction. A plurality of second guide pillars standing apart at equal intervals at a shifted position. In the first step, the stator core piece is fixed to the stator using the plurality of first guide pillars. A step of arranging a plurality of stator core pieces constituting a layer in the core body, and a plurality of stators constituting a layer in the stator core body using the plurality of second guide pillars The step of arranging the core pieces may be performed alternately.

  In the stator core manufacturing method of the present invention, stepped notches are formed at both ends of the outer edge of the stator core piece, and all of the stator core pieces constituting the stator core body are in the circumferential direction. After being positioned, a joint member is disposed in each of the plurality of grooves defined by the notches of the adjacent stator core pieces so as to cover the joints between the adjacent stator core pieces, and the joint member And fillet welding the bottom of the groove.

  A stator core manufacturing apparatus according to the present invention includes a stator core body configured by stacking a plurality of stator core pieces arranged in an annular shape, and has a substantially cylindrical rotating electric machine with a skew. An apparatus for manufacturing a stator core used for manufacturing a stator core of the first embodiment, comprising: a first jig provided with a plurality of guide pillars; a cylindrical barrel portion; And a second jig provided with an urging means having one or more members urged outward, and each guide column of the first jig is a stator core A guide surface that contacts the outer edge of the piece, and a guide protrusion that is formed on the guide surface and that fits in a guide groove or a recess formed in the stator core piece. The guide groove or the projecting ridge is formed in a spiral shape and extends up and down. The guide pillars are vertically provided with the guide surfaces facing inward and spaced apart from each other in the circumferential direction, and the second jig is provided so as to be movable up and down, and is positioned on the guide surface side of the plurality of guide pillars. Are arranged so as to be rotatable around the vertical axis.

  The stator core piece of the present invention is a substantially fan-shaped stator core piece that constitutes a substantially cylindrical stator core body, and the stator core piece that defines the outer peripheral surface of the stator core has an arcuate outer edge portion. A convex portion or a concave portion is formed, and stepped notches are formed at both ends of the outer edge portion of the stator core piece.

  In the present invention, the stator core pieces constituting the stator core body are stacked using the first jig. The stator core piece is positioned in the radial direction by being guided by the guide surface of the guide column of the first jig. Further, the stator core piece receives a force rotating in the circumferential direction by the second jig. Accordingly, the convex portion or the concave portion is pressed against the surface defining the guide groove or the guide convex strip, and the stator core piece is positioned in the circumferential direction. Since the guide groove or the guide ridge is formed in a spiral shape, the stator core piece is arranged so that skew is imparted to the stator core.

  According to the present invention, since the stator core is manufactured in this way, the manufacturing process of the stator core is simplified as compared with the prior art, and the stator core piece is increased in the radial direction and the circumferential direction. Can be placed with accuracy. Furthermore, according to the present invention, since it is not necessary to form a crimp on the stator core, the manufacturing cost is reduced.

It is a perspective view which shows the stator core of the rotary electric machine produced based on the stator core manufacturing method which is one Embodiment of this invention. It is a top view which shows the stator core piece which comprises the stator core shown in FIG. It is a top view which shows the end plate which comprises the stator core shown in FIG. It is a top view which shows the 1st jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is a bottom view which shows the 1st jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is sectional drawing which shows the 1st jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is a perspective view which shows the 2nd jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is sectional drawing which shows a part of 2nd jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is sectional drawing which shows a part of 2nd jig | tool of the stator core manufacturing apparatus which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is explanatory drawing for demonstrating the stator core manufacturing method which is one Embodiment of this invention. It is a top view which shows the 1st jig | tool of the stator core manufacturing apparatus in another embodiment of this invention. It is a bottom view which shows the 1st jig | tool of the stator core manufacturing apparatus in another embodiment of this invention. It is explanatory drawing explaining the arrangement | positioning of the stator core piece used in another embodiment of this invention, and the said stator core piece. It is explanatory drawing explaining the arrangement | positioning of the stator core piece used in another embodiment of this invention, and the said stator core piece. It is explanatory drawing for demonstrating the stator core manufacturing method which is another embodiment of this invention.

  The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of a stator core of a rotating electrical machine manufactured using the method of the present invention. A stator core 1 shown in FIG. 1 is a hollow, substantially cylindrical member constituting a rotating electrical machine. In the rotating electrical machine, a rotor (not shown) constituting the rotating electrical machine is accommodated in the space inside the stator core 1. The stator core 1 is used in, for example, a permanent magnet type electric motor or generator, but the rotating electrical machine to which the stator core manufactured using the method of the present invention is applied is not limited to these.

  The stator core 1 includes a stator core body 20 composed of a plurality of stator core pieces 10, two end plates 30 disposed at both ends of the stator core body 20, and side surfaces of the stator core body 20. And a plurality of joint members 40 arranged.

  The stator core body 20 is configured by stacking a plurality of stator core pieces 10 arranged in an annular shape. All the stator core pieces 10 constituting the stator core body 20 have the same shape. FIG. 2 is a plan view showing the configuration of the stator core piece 10. The stator core piece 10 is a substantially sector-shaped electromagnetic steel plate (more specifically, a silicon steel plate). The thickness of the stator core piece 10 is, for example, about 0.5 mm, but is not limited thereto.

  The outline of the stator core piece 10 is composed of an outer edge portion 11 constituting the outer surface of the stator core body 20, an inner edge portion 12 constituting the inner surface of the stator core body 20, and side edge portions 13a and 13b connecting these. It is prescribed. The outer edge portion 11 is formed in an arc shape, but the convex portion 14 is provided on the stator core piece 10 by protruding near the center of the outer edge portion 11. Furthermore, the notch part 15 is provided in the stator core piece 10 because the both ends of the outer edge part 11 are dented inside in a step shape.

  The convex part 14 of the stator core piece 10 is used to position the stator core piece 10 when the stator core 1 is manufactured, as will be described later. In the present embodiment, the shape of the convex portion 14 of the stator core piece 10 is rectangular, and the convex portion 14 is provided at a position that bisects the length of the outer edge of the stator core piece 10 in the arc direction. ing.

  The inner edge portion 12 includes a plurality of arc portions 16 and a plurality of notch portions 17, and these arc portions 16 are formed concentrically with the arc portion of the outer edge portion 11. The notch 17 defines (partially) a slot (not shown) in the stator core body 20. The slot of the stator core body 20 is used for winding a coil (not shown) around the stator core 1 as is well known. The notches 17 are provided at predetermined intervals in the circumferential direction of the stator core piece 10. In the example shown in FIG. 2, the notch portions 17 are provided at an angle of 10 degrees around the center of the arc, and the end region of the notch portion 17 connected to the arc portion 16 is chamfered (R is Formed). That is, the tip of the protruding portion 18 that defines the stator teeth of the stator core 1 in the stator core piece 10 slightly protrudes in the clockwise and counterclockwise directions along the circumferential direction. It is formed in a round shape.

  The side edge portions 13a and 13b are formed linearly along the radial direction of the arc portion of the outer edge portion 11 and the arc portion 16 of the inner edge portion 12. The lengths of the side edge portions 13a and 13b are the same. In the present embodiment, the angle formed by the side edges 13a and 13b is 60 degrees, and the six stator core pieces 10 can be connected in a closed form. The stator core body 20 of the present embodiment is configured by stacking six stator core pieces 10 connected in an annular shape. That is, the stator core body 20 of the present embodiment is formed of laminated electromagnetic steel plates, and each layer of the electromagnetic steel plates is composed of six stator core pieces 10 connected in an annular shape.

  In FIG. 2, the stator core piece 10 adjacent to the stator core piece 10 shown in the center is indicated by a broken line. When the adjacent stator core pieces 10 are arranged so that the side edge portions 13a and 13b coincide with each other, the notch portions 15 of the outer edge portions 11 of the adjacent stator core pieces 10 are connected, and the U-shaped concave portion 19 is connected. Is formed. In addition, when the adjacent stator core pieces 10 are arranged so that the side edge portions 13a and 13b coincide with each other, the notch portion 17 at the end of the stator core piece 10 becomes the end of the adjacent stator core piece 10. It connects with the notch part 17 in.

  When practicing the present invention, each stator core piece 10 is usually produced by punching a magnetic steel sheet, and the dimensional tolerance of the stator core piece 10 is slightly shortened in the circumferential direction. For example, when the outer peripheral diameter of the stator core body 20 is about 700 mm, the dimensional tolerance of the stator core piece 10 is such that the outer peripheral length of the stator core piece 10 is reduced by about 0.1 to 0.3 mm. (60 ° −0.02 ° to 0.05 ° when expressed by an angle defined by a one-dot chain line extending from the side edge portions 13a and 13b shown in FIG. 2).

  FIG. 3 is a plan view of the end plate 30. The end plate 30 is an annular thick plate, and is formed of, for example, steel. The thickness of the end plate 30 is about 10 mm, for example. The radius of the arc portion of the outer peripheral edge of the end plate 30 is the same as the radius of the arc portion of the outer edge portion 11 of the stator core piece 10. Six concave portions 31 are formed on the outer peripheral edge of the end plate 30 at regular intervals in the circumferential direction. The shape of the recess 31 (viewed from above) is the same as the shape of the recess 19 formed by connecting the notches 15 of the adjacent stator core pieces 10. The radius of the inner peripheral edge of the end plate 30 is determined so that the slot of the stator core body 20 defined by the notch portion 17 of the stator core piece 10 and the end plate 30 do not interfere with each other.

  As shown in FIG. 1, the two end plates 30 are respectively disposed at one end and the other end of the stator core body 20 so as to share the center axis A with the stator core body 20. In FIG. 1, the end plate 30 located on the upper side is arranged coaxially with the six stator core pieces 10 arranged in an annular shape located immediately below the end plate 30. These are aligned with the recesses 19 of the stator core piece 10. Further, in FIG. 1, the end plate 30 located on the lower side is arranged coaxially with the six stator core pieces 10 arranged in an annular shape located immediately above the end plate 30. 31 is aligned with the recess 19 of these stator core pieces 10.

  As described above, the stator core body 20 is configured by stacking the six stator core pieces 10 arranged in an annular shape. In order to skew the stator core 1, the stator core pieces 10 of each layer are shifted from the stator core pieces 10 located immediately below the stator core pieces 10 by a predetermined distance in the circumferential direction, that is, the central axis A It is arranged at a position rotated by a predetermined angle around. In the present embodiment, the stator core piece 10 of each layer is slightly rotated in the clockwise direction around the central axis A with respect to the stator core piece 10 positioned immediately below. Six ridges 21 (three ridges 21 are shown in FIG. 1) formed by the protrusions 14 of the stator core piece 10 are formed on the side surface of the stator core body 20. Each ridge 21 forms a gentle spiral.

  In the stator core 1, six grooves 22 formed by the notch 15 or the recess 19 of the stator core piece 10 and the recess 31 of the end plate 30 are formed. In the stator core body 20, each groove 22 is shaped to form a gentle spiral. In each of the six grooves 22, a joint member 40 is disposed at the bottom of the groove 22 so as to close the joint between the adjacent stator core pieces 10. Each joint member 40 is fillet welded to the stator core piece 10 in which the joint member 40 closes the joint, and the upper and lower end plates 30. As a result, the stator core piece 10 and the end plate 30 constituting the stator core body 20 are integrated.

  In this embodiment, each joint member 40 is a quadrangular prism, and the outer surface thereof is disposed beyond the ridges 21 of the stator core piece 10 in the radial direction as shown in FIG. That is, the thickness of the joint member 40 along the radial direction of the stator core 1 is such that the depth of the concave portion 19 formed by connecting the notch portions 15 of the stator core piece 10 and the convex portion 14 of the stator core piece 10. Greater than the sum of the lengths (along the radial direction of the stator core 1). By providing the joint member 40 in this manner, when the stator core 1 is mounted on a frame (not shown) of the rotating electrical machine, the joint member 40 can be used as an engaging portion that engages with the frame. .

  In the present embodiment, the joint member 40 that is a quadrangular column is fillet welded to the bottom of each of the six grooves 22. In each groove 22, the bottom surface of the recess 31 of the upper and lower end plates 30 and the upper and lower ends are provided. The bottom edge portions of the notch portions 15 of all the stator core pieces 10 existing between the plates 30 (portions orthogonal to the side edge portions 13a-b in the notch portion 15, see FIG. 2) are on the same plane. not exist. In short, it can be said that the bottom of the groove 22 is twisted due to the application of skew to the stator core 1. However, if the skew angle is small and the degree of twisting of the bottom of the groove 22 is small, the joint member 40 that is a quadrangular column can be welded to the bottom of each groove 22 without problems.

  Next, a stator core manufacturing apparatus 70 (see FIG. 10 and the like) used for manufacturing the stator core 1 will be described. The stator core manufacturing apparatus 70 includes a first jig 50 shown in FIGS. 4 to 6 and a second jig 60 shown in FIGS. 7 to 9. The first jig 50 and the second jig 60 are arranged by stacking the stator core pieces 10, and then position the stacked stator core pieces 10 at desired positions in the stator core 20. Used for.

  4 and 5 are a plan view and a bottom view showing the first jig 50, respectively. FIG. 6 is a cross-sectional view of the first jig 50 taken along the line BB shown in FIG. The first jig 50 includes a plurality of guide columns 51, a support member 52 on which the guide columns 51 are erected, and a top plate 53 fixed to the upper end of the guide columns 51. As many guide pillars 51 as the number of stator core pieces 10 constituting each layer of the stator core body 20 are erected on the support member 52. The support member 52 is provided with a circular opening 54 into which the second jig 60 is inserted as will be described later, and the guide columns 51 are arranged at equal intervals in the circumferential direction of the opening 54. . In the present embodiment, the support member 52 is a disc in which circular openings 54 are formed coaxially, and around the openings 54, six guide pillars 51 are spaced apart at equal intervals of 60 ° in the circumferential direction. Are arranged.

  Each guide column 51 is formed in a substantially square column shape, but the inner guide surface 55 is curved in a cylindrical surface shape with the same radius of curvature as the radius of the arc portion of the outer edge portion 11 of the stator core piece 10. Is formed. Further, a gentle spiral guide groove 56 is formed on the guide surface 55 vertically from the lower end to the upper end of the guide surface 55. As shown in FIG. 4, the six guide columns 51 are arranged on the support member 52 such that their guide surfaces 55 are arranged coaxially with the openings 54.

  The depth of the guide groove 56 of the first jig 50 (along the radial direction) is larger than the length along the radial direction of the convex portion 14 of the stator core piece 10. The width of the guide groove 56 in the circumferential direction of the first jig 50 is larger than the width of the convex portion 14 of the stator core piece 10 by a predetermined value.

  In the present embodiment, the top plate 53 is an annular plate material and is arranged coaxially with the support member 52. The radius of the inner peripheral edge of the top plate 53 is larger than the sum of the radius of curvature of the guide surface 55 and the depth of the guide groove 56, and each guide is viewed from the upper side of the first jig 50 as shown in FIG. The guide groove 56 of the column 51 is completely exposed.

  FIG. 7 is a perspective view showing the second jig 60. 8 is a cross-sectional view of a part of the second jig 60 taken along the plane including the line CC shown in FIG. 7 and viewed from the direction of the arrow, and FIG. 9 includes the line DD shown in FIG. It is sectional drawing of the part of the 2nd jig | tool 60 fractured | ruptured by the plane and seen by the arrow.

  The second jig 60 is provided on a cylindrical body 61, a head 62 attached to the upper side of the body 61, a bottom 63 attached to the lower side of the body 61, and a side surface of the body 61. A plurality of pressing pieces 64. The outer diameter of the trunk portion 61 is slightly smaller than the inner diameter of the stator core 1. The bottom 63 is a cylindrical member having the same outer diameter as that of the body 61, and is fixed to the lower side of the body 61 with, for example, a bolt. The head 62 is a frustoconical member. The outer diameter of the lower bottom of the head 62 is the same as the outer diameter of the body 61, and the outer diameter of the upper bottom of the head 62 is smaller than the outer diameter of the lower bottom. The head 62 is fixed by welding, for example. The head 62 may be formed integrally with the body 61.

  A plurality of pressing pieces 64 protruding in the radial direction from the side surface of the body portion 61 are provided on the side surface of the body portion 61 along the height direction of the second jig 60. The pressing piece 64 is a rod-shaped member, and is provided on the body portion 61 so that a convex pressing surface having an oval shape is exposed when viewed from the side. The plurality of pressing pieces 64 are arranged along the central axis direction of the second jig 60 and at equal intervals in the circumferential direction of the second jig 60. In the present embodiment, the four pressing pieces 64 are provided on the side surface of the barrel portion 61 at intervals of 90 ° around the central axis of the barrel portion 61. However, in the present invention, the number of the pressing pieces 64 is not limited. For example, the number of stator core pieces 10 constituting each layer of the stator core body 20 may be the same.

  The pressing piece 64 is provided so as to be able to protrude and retract from the side surfaces of the body 61 and the bottom 63. As shown in FIGS. 8 and 9, in the second jig 60, a recess 65 corresponding to each pressing piece 64 is provided across the body 61 and the bottom 63 in order to mount the pressing piece 64. Between the bottom surface of the recess 65 and the pressing piece 64, an urging member 66 such as a helical spring or a leaf spring, which is an urging means of the present invention, is provided. Is attached to the recess 65 in a state of being urged in the radial direction. Since the side surface of the pressing piece 64 is guided by the side surface of the recess 65, the pressing piece 64 can move along the radial direction. As shown in FIG. 9, a flange 67 is formed on the urging member 66 side of the pressing piece 64, and the flange 67 abuts on a shoulder 68 formed on a surface defining the recess 65. Thus, the movement of the pressing piece 64 along the radial direction is limited.

  For example, the outer diameters of the body 61 and the bottom 63 and the radius of the bottom surface of the head 62 are larger than the inner diameter of the stator core 1, that is, the radius of curvature of the arc portion 16 of the inner edge 12 of the stator core piece 10. The pressing piece 64 is shortened by about 1 mm, and protrudes from the side surfaces of the body portion 61 and the bottom portion 63 by about 1 mm (in a state where the collar portion 67 is in contact with the shoulder portion 68). The distance along the radial direction between the location of the pressing piece 64 farthest from the central axis of the body 61 and the central axis of the body 61 is the radius of curvature of the arc portion 16 of the stator core piece 10. Is slightly longer than. The radius of the upper surface of the head 62 of the second jig 60 is made shorter by about 5 mm than the inner diameter of the stator core 1. The height of the head 62 is about 50 mm, and the sum of the heights of the body 61 and the bottom 63 is about 10 mm longer than the height of the stator core body 20, that is, the stack thickness of the stator core piece 10. Is done.

  Next, the manufacturing method of the stator core 1 using the stator core manufacturing apparatus 70 provided with the 1st jig | tool 50 and the 2nd jig | tool 60 is demonstrated.

  FIG. 10 is an explanatory diagram illustrating an overview of the state of the stator core manufacturing apparatus 70 before the start of the manufacture of the stator core 1 (FIG. 10 shows the stator core manufacturing apparatus 70 viewed from the side). The first jig 50 is installed on a support base 71 included in the stator core manufacturing apparatus 70. The support base 71 is disposed horizontally. An opening 72 is formed in the support base 71, and the support member 52 is disposed on the support base 71 so that the opening 54 of the support member 52 is completely exposed from the opening 72 of the support base 71 when viewed from below. The

  The stator core manufacturing apparatus 70 includes a rotating shaft body 73 disposed along the vertical direction, and the second jig 60 is fixed to the upper end side of the rotating shaft body 73. A rotating mechanism and a lifting mechanism (not shown) are provided on the lower end side of the rotating shaft body 73, and the rotating shaft body 73 is configured to be vertically movable and rotatable about the vertical axis. The central axis of the second jig 60, the central axis of the first jig 50, and the central axis of the rotating shaft body 73 are arranged so as to coincide with each other. As shown in FIG. 10, the second jig 60 can be arranged below the support base 71.

  In the state shown in FIG. 10, first, the first end plate 30 is inserted into the first jig 50 from above through the opening of the top plate 53 of the first jig 50. The end plate 30 is guided on the guide surface 55 of the guide column 51 and is disposed on the support member 52 of the first jig 50. The end plate 30 is disposed on the support member 52 in a state of being positioned in the circumferential direction by a positioning unit (not shown).

  After the end plate 30 is disposed on the support member 52, the second jig 60 is raised to a predetermined initial position. In the initial position, the second jig 60 is arranged in a state where the head 62 of the second jig 60 completely exceeds the upper surface of the end plate 30, but the tip of the pressing piece 64 of the second jig 60 is The upper surface of the end plate 30 is not exceeded. Thereafter, an operation of stacking the stator core pieces 10 on the end plate 30 by a predetermined number of layers (for example, about 10 layers) is performed. In the initial position, the upper part of the body 61 of the second jig 60 protrudes from the upper surface of the end plate 30 at least by a height corresponding to the predetermined number of layers of the stator core piece 10. The second jig 60 is disposed.

  As described above, each layer of the stator core body 20 is composed of six stator core pieces 10 arranged in an annular shape. In the stacking operation, the convex portion 14 of the stator core piece 10 is inserted into the guide groove 56 of each guide pillar 51 from above, and the stator core piece 10 is moved downward so as to be guided by the guide groove 56. Then, the six stator core pieces 10 are arranged on the end plate 30 in an annular shape or a substantially annular shape. Thereafter, the stator core pieces 10 are similarly moved using the guide pillars 51 to stack the six stator core pieces 10 for each layer. FIG. 11 shows a state where the second jig 60 is in the initial position and the six stator core pieces 10 are stacked on the end plate 30 by a plurality of layers. In FIG. 11, the lower portion of the two guide pillars 51 located on the near side is not shown, and the stator core piece 10, the lower end plate 30, the support member 52, and the support base 71 are FIG. 11 is broken along the vertical plane (the same applies to FIGS. 11, 14, and 15).

  In the stacking operation, when the stator core pieces 10 of the respective layers are arranged, the stator core pieces 10 may be dropped downward after inserting the convex portions 14 of the stator core pieces 10 into the guide grooves 56. Since the head 62 of the second jig 60 is formed in a truncated cone shape, and the head 62 is connected to the cylindrical body 61, the falling stator core piece 10 is radially inward. The stator core piece 10 that has fallen is suitable for the radial direction because the arc portion 16 of the inner edge portion 12 of the stator core piece 10 abuts against the outer surface of the head portion 62 and the trunk portion 61. It will be arranged at a position or almost an appropriate position. A lubricant is preferably applied to the body 61 and the head 62 of the second jig 60 that can come into contact with the stator core piece 10.

  The stator core pieces 10 stacked as described above are temporarily placed, and some of these stator core pieces 10 are slightly separated inward from the guide surfaces of the corresponding guide pillars 51. Could exist. Moreover, in the stator core piece 10 in the temporarily placed state, the stator core piece 10 constituting a layer of the stator core 20 slightly rides on the adjacent stator core piece 10 constituting the same layer. Could also happen. As described above, since the dimensional tolerance of the stator core piece 10 is slightly shortened in the circumferential direction, such a ride-up of the stator core piece 10 occurs in a temporarily placed state. The possibility is considered low. However, in the present invention, after the stator core piece 10 is temporarily placed, the presence or absence of the stator core piece 10 is checked, and if present, the position of the stator core piece 10 is corrected, A step of removing the ride of the stator core piece 10 may be performed.

  As shown in FIG. 11, after the stator core pieces 10 are stacked for a certain number of layers, the stator core manufacturing apparatus 70 rotates the rotary shaft 73 around its central axis (as viewed from above) in a clockwise direction. Raise while rotating. As a result, the second jig 60 also rotates and rises in the same manner, and the pressing piece 64 of the second jig 60 is inserted inside the temporarily placed stator core piece 10. When the pressing piece 64 of the second jig 60 is pressed by the inner edge portion 12 (the arc portion 16 thereof) of the stator core piece 10, the urging member 66 contracts, and the pressing piece 64 moves along the radial direction. Move inward. As a result, the pressing piece 64 of the second jig 60 enters the inside of the temporarily placed stator core piece 10. FIG. 12 shows a pattern in which the second jig 60 rises while rotating inside the stator core piece 10 disposed on the first jig 50.

  By pressing the stator core piece 10 in contact with the pressing piece 64 in the radial direction, the outer edge portion 11 of the stator core piece 10 comes into contact with the guide surface 55 of the guide column 51, and the stator core piece 10 is Positioned in the radial direction. Further, when the second jig 60 is rotated, a force is applied to the stator core piece 10 that contacts the pressing piece 64 to rotate (or push) the stator core piece 10 in the circumferential direction. Thereby, one side part of the convex part 14 of the stator core piece 10 contacts one side surface of the guide groove 56 of the guide column 51 in which the convex part 14 is inserted. Thereby, the stator core piece 10 is positioned in the circumferential direction. In addition, it is preferable that the lubricant is applied to each pressing piece 64 because the stator core piece 10 is rotated while being pressed in the radial direction.

  FIG. 13 is a cross-sectional view in which a certain guide column 51 is partially broken along the vertical plane (when the bottom surface of the guide groove 56 is viewed) while the stator core piece 10 is rotating. A part of the groove 56 and the convex portion 14 of the stator core piece 10 fitted in the guide groove 56 are shown. The convex portion 14 of the stator core piece 10 that has received the force to rotate in the circumferential direction is pressed against one side wall that defines the guide groove 56 as shown in FIG. 13 (in FIG. 13, the force to rotate in the circumferential direction is applied). The convex part 14 of the stator core piece 10 not received is indicated by a broken line). In the present embodiment, the second jig 60 rotates clockwise when viewed from above, but the second jig 60 may rotate counterclockwise when viewed from above, in which case the circumferential direction The convex portion 14 of the stator core piece 10 that has received the force to rotate in the direction is pressed against the other side wall that defines the guide groove 56 in FIG. 13, so that the stator core piece 10 is positioned in the circumferential direction. .

  When the second jig 60 rotates, the pressing piece 64 of the second jig 60 slides along the arc portion 16 of the inner edge portion 12 of the stator core piece 10. Note that, as described above, the tip of the protruding portion 18 that defines the stator teeth of the stator core 1 is chamfered, so that the circumferential rotation of the pressing piece 64 is not hindered. When the pressing piece 64 slides, the pressing piece 64 that has been acting on a certain stator core piece 10 acts on the stator core piece 10 adjacent to the stator core piece 10, and the stator core The piece 10 is positioned in the radial direction and in the circumferential direction (when not receiving the action of the other pressing piece 64). Therefore, the six stator core pieces 10 constituting a layer of the stator core 20 are positioned in the radial direction by receiving the action of the pressing piece 64 of the second jig 60 in the temporarily placed state. The adjacent side edge portions 13a and 13b are arranged in an annular shape so as to coincide with each other, and (6 stator core pieces 10) as a whole are positioned with high accuracy in the circumferential direction. As the second jig 60 is raised while rotating, the stator core piece 10 constituting the upper layer is positioned by the stator core 20.

  When the pressing piece 64 of the rising second jig 60 hits the stator core piece 10, an upward pressing force acts on the stator core piece 10, but the number of the stator core pieces 10 on the stator core piece 10 is the same. If sufficient, the gravity acting on the stator core pieces 10 prevents the stator core pieces 10 (and the stator core pieces 10 thereabove) against the pressing pieces 64 from being lifted. Therefore, during the ascent of the second jig 60, a predetermined number of layers of stators sufficient to suppress the stator core piece 10 from being lifted on the uppermost stator core piece 10 against which the pressing piece 64 hits. It is preferred that at least the core piece 10 is placed. For example, the upper end portion of the pressing piece 64 rises up to the stator core piece 10 that constitutes a predetermined layer (for example, the fifth layer from the lowest layer) counted from the lowermost layer in the stator core 20. Thereafter, the second jig 60 stops rising and rotating. Thereafter, as shown in FIG. 14, the stator core pieces 10 are stacked and temporarily placed as described above for a certain number of layers (for example, five layers), and then a predetermined number of layers (for example, five layers). The second jig 60 is raised while rotating.

  Before raising the second jig 60 while rotating the inner side of the stator core piece 10 disposed in the first jig 50 in a fixed direction, rotating the stator core piece 10 by a predetermined angle in the opposite direction to the direction. A step of raising the second jig 60 and inserting it into the temporarily placed stator core piece 10 may be performed. The rotation of the second jig 60 in the process is in a slight range (for example, about several degrees). After performing this process, by raising the second jig 60 while rotating it in the original direction, the riding-up state of the stator core piece 10 in the temporary placement stage described above is eliminated or reduced. While the second jig 60 is raised while being rotated in a fixed direction and inserted into the temporarily placed stator core piece 10, the second jig 60 is temporarily rotated slightly in the reverse direction. May be. Moreover, such a reverse rotation process may be performed intermittently a plurality of times while the second jig 60 is being lifted, and the second jig 60 can be moved to the stator core without raising the second jig 60. You may be made in the state inserted in the inside of the piece 10. FIG.

  After repeating the stacking or temporary placement of the stator core pieces 10 for a predetermined number of layers and the raising (while rotating) the second jig 60 for the stator core pieces 10 for a predetermined number of layers, the stator A predetermined number of stator core pieces 10 positioned on the uppermost layer side of the core 1 are finally stacked. Thereafter, the end plate 30 is placed on the uppermost stator core piece 10. The end plate 30 is guided on the guide surface 55 of the guide column 51 and is disposed on the stator core piece 10 constituting the uppermost layer in a state where the end plate 30 is positioned in the circumferential direction by positioning means (not shown).

  As shown in FIG. 15, after the six stator core pieces 10 constituting the last layer are arranged, in order to suppress the lift of the stator core piece 10 located on the uppermost layer side and the end plate 30, The stator core manufacturing apparatus 70 presses the pressing member 74 against the upper surface of the upper end plate 30 with a predetermined pressure. The pressing member 74 is provided in the stator core manufacturing apparatus 70 so as to be movable up and down. After the pressing member 74 is pressed against the upper end plate 30, the stator core manufacturing apparatus 70 raises the second jig 60 while rotating the end jig 30 while the end plate 30 is pressed by the pressing member 74. When the pressing piece 64 acts on the stator core piece 10 on the uppermost layer side, the stator core pieces 10 are positioned as described above.

  After all of the stator core pieces 10 constituting the stator core body 20 are positioned, the end plate 30 is pushed by the pressing member 74, and the notch 15 or the recess 19 of the stator core piece 10 and the end The joint member 40 is welded to each of the six grooves 22 formed by the concave portions 31 of the plate 30. The joint member 40 is disposed so as to cover the joint between the adjacent stator core pieces 10, and the joint member 40 and the bottom of the groove 22 are fillet welded. Thereby, the stator core 1 is completed.

  After welding the joint member 40, the pressing member 74 moves to the outside of the first jig 50. Thereafter, the completed stator core 1 is removed from the first jig 50 by moving upward while rotating. The guide column 51 and the top plate 53 of the first jig 50 are integrated with each other so as to be detachable from the support member 52. After the stator core 1 is completed, the guide column 51 and the top plate 53 are separated from the support member 52. The stator core 1 may be taken out by removing it.

  In the above embodiment of the present invention, each layer of the stator core body 20 is composed of six stator core pieces 10, but in the present invention, the stator core that constitutes each layer of the stator core body 20. The number of pieces is not limited. For example, each layer of the stator core body 20 is composed of eight, four, and three stator core pieces obtained by dividing an annular stator core piece at 45 °, 90 °, and 120 ° intervals around the center thereof. May be configured. The number of guide pillars 51 of the first jig 50 is the same as the number of stator core pieces constituting each layer of the stator core body 20, and these guide pillars 51 divide 360 degrees by the number of guide pillars 51. Further, the guide surface 55 of the guide column 51 is disposed on a cylindrical surface centered on the central axis so as to have a rotational symmetry of an angle around a predetermined central axis.

  In the above embodiment of the present invention, the stator core 1 is formed with the six grooves 22 constituted by the notches 15 or the recesses 19 of the stator core piece 10 and the recesses 31 of the end plate 30. The bottom of 22 and the quadrangular columnar joint member 40 are fillet welded. However, in the present invention, the shape of the joint member 40 is not limited to the quadrangular column and can be welded to the bottom of the groove 22 and fillet. Any shape joint member 40 may be used. Further, in the present invention, the groove 22 is not formed in the stator core 1 (that is, the notch portion 15 is not formed in the stator core piece 10 and the recess 31 is not formed in the upper and lower end plates 30). The joint member that extends in the vertical direction and is curved (to be along the outer peripheral surface of the stator core main body 20) so as to close the joint between the stator core pieces 10 is arranged. Fillet welds may be made to the plate 30.

  FIG. 16 is a plan view of a first jig 50 ′ of a stator core manufacturing apparatus 70 according to another embodiment of the present invention, and FIG. 17 is a bottom view of the first jig 50 ′. The first jig 50 ′ shown in FIGS. 16 and 17 has six first guide pillars 51 ′ spaced apart at equal intervals in the circumferential direction, like the guide pillars 51 of the first jig 50 shown in FIG. It has. Further, the first jig 50 ′ has a predetermined distance in the circumferential direction with respect to the six first guide columns 51 ′ (or a center defined by the cylindrical guide surface 55 of the first guide columns 51 ′. There are six second guide columns 51 ″ that are offset from the guide column 51 ′ by a predetermined angle around the axis. In the illustrated embodiment, a total of twelve guide columns 51 ′ and guides are provided. The pillars 51 ″ are arranged at equal intervals in the circumferential direction.

  The first jig 50 ′ shown in FIGS. 16 and 17 can be used when each layer of the stator core body 20 is composed of 12 stator core pieces in the above-described embodiment. On the other hand, the first jig 50 'can also be used when the stator core body 20 is configured using the stator core piece 10' shown in FIG. As shown in FIG. 18, the stator core piece 10 ′ is formed in the same manner as the stator core piece 10 shown in FIG. 2 except that the notch 15 is not provided in the outer edge portion 11. When the stator core piece 10 ′ shown in FIG. 18 is arranged or temporarily placed using the first jig 50 ′ shown in FIGS. 16 and 17, the set of the first guide columns 51 ′ and the second guide columns 51 are arranged. The step of arranging six stator core pieces 10 ′ constituting a layer of the stator core body 20 using one of the groups of “the group of the first guide column 51 ′ and the second guide column The step of arranging the six stator core pieces 10 ′ constituting a certain layer of the stator core body 20 is alternately executed by using the other pair of 51 ″. Except for this point, the stator core 1 may be manufactured in the same manner as in the previous embodiment, but it is not necessary to form the recess 31 as shown in FIG. 3 in the end plate 30 to be used. . Further, the final fixing of the stator core piece 10 ′ and the end plate 30 extends vertically, and a plurality of curved joint members are spaced apart in the circumferential direction and arranged on the outer surface of the stator core body 20, This may be performed by fillet welding the stator core piece 10 ′ and the end plate 30. In FIG. 18, one stator core piece 10 ′ out of six stator core pieces 10 ′ constituting a layer of the stator core main body 20 is disposed below (or above) a solid line. The stator core piece 10 ′ and the stator core piece 10 ′ adjacent thereto are indicated by broken lines. As shown in FIG. 18, when the stator core body 20 is configured using the stator core piece 10 ′, each set of the first guide column 51 ′ and the second guide column 51 ″ is configured. The number of guide pillars to be performed is not limited in the present invention and may be plural, and the number of stator core pieces 10 ′ constituting each layer of the stator core body 20 is the number of guide pillars constituting each set. It should be noted that the stator core piece 10 'is configured by providing concave notches on the outer edge 11 on both sides of the convex portion 14 of the stator core piece 10' shown in FIG. A groove such as the groove 22 shown in FIG. 1 is formed on the outer surface of the stator core body 20, and a joint member such as the joint member 40 is welded to the groove to fill the stator core piece 10 ′ and The end plate 30 may be finally fixed.

  Since each stator core piece 10 is formed with the dimensional tolerances as described above, in the manufacturing method of the embodiment described with reference to FIGS. There is a possibility that the gap between the pieces 10 is unevenly distributed. The stator core piece 10 ′ shown in FIG. 18 may also be formed with the dimensional tolerances as described above, and the stator core body 20 is configured using the stator core piece 10 ′ as shown in FIG. In this case, the uneven distribution or concentration of the gap between the stator core pieces 10 in the stator core 1 is alleviated, and as a result, the gap between the stator core pieces 10 causes the magnetic flux distribution of the stator core 1 when the rotating electrical machine is driven. Adverse effects on

  The position of the convex portion 14 at the outer edge portion 11 of the stator core piece 10 ′ shown in FIG. 18 is not limited, and is not at the center of the outer edge portion 11, but at any one of the side edge portions 13a and 13b as shown in FIG. It may be arranged in a close position. When the stator core body 10 ′ shown in FIG. 19 is used to form the stator core body 20, the joint member as described above is connected to the joint between the stator core pieces 10 (the joint is fixed). Are arranged on the outer surface of the stator core body 20 so as to be spaced apart from each other in the circumferential direction so as to block (in the height direction of the child core body 20, discretely arranged at intervals of one layer of the stator core piece 10). The fillet may be welded to the stator core piece 10 ′ and the end plate 30. 2, it can be understood that the position of the convex portion 14 in the outer edge portion 11 is not limited to the center of the outer edge portion 11.

  In the embodiment described above, the convex portion 14 is provided on the stator core piece 10 and the stator core piece 10 ', the guide pillar 51 of the first jig 50, and the first guide of the first jig 50'. The guide groove 56 is provided in the column 51 ′ and the second guide column 51 ″. However, a recess is provided in the stator core piece 10 and the stator core piece 10 ′ in place of the protrusion 14, and the guide groove 56 is provided. Instead of this, spiral ridges may be provided on the guide column 51 ′, the first guide column 51 ′, and the second guide column 51 ″. FIG. 20 is an explanatory view showing an example of this modified example. In the embodiment shown in FIG. 3 and the like, the stator core piece 10 in which a concave portion 14 ′ is formed instead of the convex portion 14, and the guide groove 56. Instead, a part of the cross section of the guide column 51 in which a spiral ridge 56 ′ extending vertically is formed is shown. As described above, when the second jig 60 is rotated, the one side edge of the recess 14 ′ and the side wall of the protrusion 56 ′ contact each other, and the stator core piece 10 is positioned in the circumferential direction.

  In this invention, the order of the process which produces the stator core 1 is not limited to the order mentioned above, You may change suitably. For example, in the above embodiment, the second jig 60 is moved after the end plate 30 is arranged on the support member 52 of the first jig 50. However, the second jig 60 is moved to the initial position described above. The end plate 30 may be disposed on the support member 52 of the first jig 50 after being moved to.

  The accompanying drawings are for explaining the present invention and include parts exaggerated for the sake of explanation. The accompanying drawings do not accurately reflect the ratio of external lines or the like that defines the shape of the component of the present invention or the relative size ratio of the component when the present invention is actually implemented. Note that.

  The above description is provided to illustrate the present invention and should not be construed as limiting the invention described in the claims or reducing the scope thereof. The configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

DESCRIPTION OF SYMBOLS 1 Stator core 10 Stator core piece 10 'Stator core piece 11 Outer edge part 12 Inner edge part 14 Convex part 14' Concave part 17 Notch part 20 Stator core main body 22 Groove 30 End plate 40 Joint member 50 First jig 50 'First jig 51 guide column 51' guide column 51 'guide column 55 guide surface 56 guide groove 56' guide projection 60 second jig 64 pressing piece 66 biasing member 70 stator core manufacturing apparatus

Claims (9)

Manufacture of a stator core for manufacturing a stator core of a substantially cylindrical rotating electric machine with a skew provided with a stator core body configured by laminating a plurality of stator core pieces arranged in an annular shape A method,
The stator core piece is formed in a substantially fan shape,
A convex portion or a concave portion is formed on the arc-shaped outer edge portion of the stator core piece that defines the outer peripheral surface of the stator core body,
The stator core piece is positioned using the first jig and the second jig,
The first jig includes a plurality of guide columns, and each guide column is formed on the guide surface that contacts the outer edge of the stator core piece, and the convex portion of the stator core piece. A guide groove that fits in or a guide ridge that fits into the recess of the stator core piece,
The guide groove or guide ridge is formed in a spiral and extends vertically,
The plurality of guide columns are erected apart from each other in the circumferential direction with the guide surface facing inward,
The second jig includes a cylindrical body portion, and an urging unit that is provided so as to be able to protrude and retract outward from the body portion and has one or more members urged outward. And
The second jig is arranged to be positioned on the guide surface side of the plurality of guide pillars, and is configured to be rotatable around the vertical axis.
A first step of stacking the stator core pieces included in several layers of the stator core pieces constituting the stator core body using the first jig;
With the inner edge of at least some of the stator core pieces stacked using the first jig being urged by the urging means of the second jig, the second jig is moved to the vertical axis. A second step of rotating around,
A method for manufacturing a stator core, comprising: The second jig is configured to be movable up and down,
The method of manufacturing a stator core according to claim 1, wherein the second step includes a step of rotating the second jig while raising it.   The method for manufacturing a stator core according to claim 1 or 2, wherein the first step and the second step are alternately repeated a plurality of times.   A plurality of stator core pieces constituting the uppermost layer in the stator core main body are stacked using the first jig, and then include a step of pressing these stator core pieces downward. The method for producing a stator core according to any one of claims 3 to 4.   2. The method includes a third step of rotating the second jig about a vertical axis by a predetermined angle in a direction opposite to the rotation direction in the second step in a state where the second jig is in contact with the stator core piece. The manufacturing method of the stator core in any one of thru | or 4. The plurality of guide pillars are spaced apart from each other at equal intervals at a position shifted in the circumferential direction from the plurality of first guide pillars and the plurality of first guide pillars erected at regular intervals in the circumferential direction. A plurality of second guide pillars standing upright,
In the first step, using a plurality of first guide pillars, a step of arranging a plurality of stator core pieces constituting a layer of the stator core body with the stator core body, and a plurality of second guide pillars are used. The stator core production according to any one of claims 1 to 5, wherein the step of alternately arranging a plurality of stator core pieces constituting a layer of the stator core body on the stator core body is performed alternately. Method. Stepped notches are formed at both ends of the outer edge of the stator core piece,
After all of the stator core pieces constituting the stator core body are positioned, each of the plurality of grooves defined by the notches of the adjacent stator core pieces is connected to the joint between the adjacent stator core pieces. A method for manufacturing a stator core according to any one of claims 1 to 5, further comprising a step of arranging a joint member so as to cover and fillet welding the joint member and the bottom of the groove. The stator core body is configured by stacking a plurality of stator core pieces arranged in an annular shape, and is used for manufacturing a substantially cylindrical stator core of a rotating electrical machine to which a skew is applied. A stator core manufacturing apparatus comprising:
A first jig having a plurality of guide pillars;
A second jig provided with a body part and an urging means provided so as to be able to protrude and retract from the body part and having one or a plurality of members urged outward;
With
Each guide column of the first jig is formed on the guide surface that contacts the outer edge of the stator core piece, and a guide groove or fixed in which the convex portion formed on the stator core piece fits. A guide ridge that fits into a recess formed in the child core piece,
The guide groove or guide ridge is formed in a spiral and extends vertically,
The plurality of guide columns are erected apart from each other in the circumferential direction with the guide surface facing inward,
The second jig is a stator core manufacturing apparatus that is provided so as to be movable up and down, is arranged to be positioned on the guide surface side of the plurality of guide pillars, and is configured to be rotatable about a vertical axis. In the substantially fan-shaped stator core piece constituting the stator core body in the stator of the substantially cylindrical rotating electric machine,
A convex portion or a concave portion is formed on the arc-shaped outer edge portion of the stator core piece that defines the outer peripheral surface of the stator core body,
A stator core piece in which stepped notches are formed at both ends of the outer edge of the stator core piece.

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