JP4547172B2 - Stator core and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a stator core having an annular back core portion and a plurality of teeth extending radially from the back core portion, and a manufacturing apparatus therefor, and in particular, a stator core formed by laminating thin steel plates in a spiral shape and the same It relates to a manufacturing apparatus.

  A stator core in a rotating electrical machine is configured by laminating thin steel plates made of magnetic material. In order to improve the material utilization rate of the stator core, a stator core is known in which a comb-shaped thin steel plate is processed into an arc shape and spirally wound around a center line perpendicular to the surface of the thin steel plate and stacked. Such a stator core manufacturing apparatus includes a supply mechanism that supplies a thin steel plate, a spiral guide mechanism that guides the thin steel plate in a spiral manner along a virtual circle whose tangential direction is the supply direction from the supply mechanism, and There has been proposed an apparatus including a drive wheel having the center of a virtual circle as a rotation axis and a mandrel that winds a thin steel plate guided spirally (see, for example, Patent Document 1). In this apparatus, the bent sheet steel sheet is wound around the mandrel by the spiral guide path of the casing while rotating together with the driving wheel, and the sheet steel sheet is deformed into a spiral shape like drawing (or pulling). This type of processing is called edgewise molding.

Japanese Patent No. 2555314

  In the above edgewise forming, a thin steel plate can be helically deformed. However, since the drawing is performed, it is difficult to reduce the curvature of the back core portion, and it is difficult to manufacture a small stator core. Further, in edgewise forming, it has been pointed out that it is difficult to deform a thin steel plate in a spiral shape with a uniform curvature, and the quality of the manufactured stator core is not stable.

  In order to obtain a stator core with a predetermined diameter, it is necessary to sequentially manufacture according to the diameter of the stator core that manufactures the forming mechanism such as the spiral guide mechanism, which requires a long production time and a considerable increase in equipment costs. End up.

  The present invention has been made in view of such problems, and an object of the present invention is to improve the material utilization rate of a thin steel plate and to provide a high-quality stator core and a manufacturing apparatus thereof. Another object of the present invention is to provide a stator core manufacturing apparatus that can manufacture stator cores of various diameters simply and inexpensively.

  The stator core according to the present invention is a stator core having an annular back core portion and a plurality of teeth extending radially from the back core portion, wherein the teeth and the back core portion are composed of a comb tooth plate and a connecting plate. Comb-shaped thin steel plates are laminated in a spiral shape, and the connecting plate forming the back core portion has a bent portion provided radially, and the circumferential sectional area of the bent portion is It is set so that it may become large toward an internal diameter direction.

  Thus, by providing the bent portion in the back core portion, the curvature of the back core portion is set uniformly, and a high-quality stator core is obtained. Moreover, a material utilization rate can be improved by laminating | stacking a thin steel plate helically.

  Furthermore, when the inner diameter side end surface is substantially triangular, the bent portions are laminated with the phases of the bent portions being matched, and the teeth are formed in an appropriate shape.

  If the center of the bent portion is provided at each bridge portion connecting the comb-tooth plates among the connecting plates, it is easy to process and the teeth are not distorted.

  In addition, the stator manufacturing apparatus according to the present invention is configured to send a comb-shaped thin steel plate made of a comb tooth plate and a connecting plate while meshing teeth in a gap between the comb tooth plates, The bent portion is formed by bending a bent portion having a shape in which the cross-sectional area increases toward one side in the width direction across both sides of the connecting plate in the thin steel plate, and the bent portion is formed. A rotating take-up unit that spirally stacks and winds the thin steel plates formed into an arc shape, and a synchronous drive unit that drives the sending unit, the bending forming unit, and the rotary take-up unit synchronously It is characterized by having.

  In this way, by forming the bent portion in the thin steel plate by the bent forming portion, stator cores having various diameters can be easily manufactured. Further, the manufacturing apparatus has a simple structure and is inexpensive and small. The feeding section, the bending forming section, and the rotary winding section are driven synchronously by the synchronous driving section so that the phases of the comb teeth plate on the rotating winding section are aligned and the stator core teeth are formed in an appropriate shape. Is done.

  The bend forming part is a pair of rollers that rotate while pressing the connecting plate from both sides, and the rollers have a plurality of bending chips for forming the bend part around the laminate. The number of the bent portions in one layer of the thin steel plate is preferably set to an integral multiple of the bending chip. As a result, the bent portions formed by the same bending chip are arranged at the same position on the rotary winding portion, and adjacent layers are laminated without gaps, and teeth without deviation in the laminating direction are properly formed. Is done.

  Furthermore, if the rotary winding portion has a teeth positioning pole that fits into the gap portion and an inner diameter positioning portion that contacts the inner side of the connecting plate, teeth that are not displaced in the stacking direction are properly formed. The

  When the thin steel plate wound in a spiral shape has a truncated cone shape, it has a cylindrical shape by pressing from the upper surface when it has a press portion that presses the upper surface of the stator formed on the rotary winding portion. Can be corrected.

  The stator core according to the present invention can improve the material utilization rate of the thin steel plate, and the curvature of the back core portion is uniform and of high quality.

  Further, according to the stator core manufacturing apparatus of the present invention, the above-described high-quality stator core can be obtained, and stator cores of various diameters can be manufactured easily and inexpensively.

  Hereinafter, a stator core and a manufacturing apparatus thereof according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the stator core 10 according to the present embodiment includes an annular back core portion 12 and 66 teeth 14 that extend radially outward from the back core portion 12. . The teeth 14 and the back core portion 12 are configured by laminating comb-shaped thin steel plates 20 (see FIG. 2) formed of a comb tooth plate 16 and a connecting plate 18 in a spiral shape, and the back core portion 12 is connected. The plate 18 has bent portions 22 provided radially from the center of the stator core 10. In the stator core 10, a coil is wound around each tooth 14 via an insulating material to form a stator, and is combined with a predetermined rotor to form a rotating electrical machine.

  In the laminated thin steel plates 20, adjacent layers are fixed by welding due to the welding action of the welded portion 24 of the inner diameter surface 10a. Each surface of the thin steel plate 20 may be fixed by a predetermined adhesive.

  FIG. 2 shows a part of one layer of the laminated thin steel plates 20. The bent portion 22 is set so that the circumferential cross-sectional area viewed from the center of the stator core 10 increases in the inner diameter direction, and the inner diameter side end surface is substantially triangular. Specifically, the center of the bent portion 22 is provided in each bridge portion 26 that connects each comb tooth plate 16 in the connecting plate 18. The outer diameter side end portions 22a, 22a of the bent portion 22 coincide with the inner diameter side end portion of the comb tooth plate 16, and the inner diameter side end portions 22b, 22b are on an extension line 28 extending the circumferential end surface of the comb tooth plate 16. Matches the point. The bent portion 22 is bent along the extension line 28 and is bent along two ridge lines connecting the inner diameter side top portion 22c and the two outer diameter side end portions 22a and 22a. In other words, the bent portion 22 has a quadrangular pyramid shape with the surface surrounded by the outer diameter side end portions 22a and 22a and the inner diameter side end portions 22b and 22b as a reference plane, and the outer diameter side end portion 22a, It has two side surfaces 22d surrounded by the inner diameter side end portion 22b and the inner diameter side top portion 22c, and a lower surface 22e surrounded by the outer diameter side end portions 22a and 22a and the inner diameter side top portion 22c. The reference surface of the bent portion 22 is a trapezoid.

  The cross section and the cross sectional area referred to here are a portion surrounded on three sides by two side surfaces 22d and a lower surface 22e, and a cross section and a cross section of a portion where no member actually exists (that is, a quadrangular pyramid portion). It is an area. The shape of the end surface on the inner diameter side of the bent portion 22 can be said to be V-shaped when attention is paid to the ends of the two side surfaces 22d.

  Since the bent portions 22 are distributed and provided in each bridge portion 26, the stator core 10 is substantially circular, and the bending degree at one bent portion 22 is small, and processing is easy. Less distortion. Further, this process is mainly a bending process, almost no drawing is required, the arc shape of the thin steel plate 20 can be set uniformly, and a high-quality stator core 10 can be obtained. Furthermore, while the bent portion 22 is bent and deformed, the teeth 14 are not bent or distorted, and the coil can be easily inserted.

  Next, the manufacturing apparatus 40 of the stator core 10 will be described with reference to FIGS.

  As shown in FIGS. 3 to 5, the manufacturing apparatus 40 sends out the thin steel plate 20 while engaging the 11 index teeth 42 a (see FIG. 4) with the gap portion 17 of the comb tooth plate 16. (Feeding portion) 42 and the bridge portions 26 that connect the bent portions 22 to the comb-tooth plates 16 of the connecting plates 18 with both sides of the connecting plate 18 of the thin steel plate 20 sent out by the index gear 42 interposed therebetween. And a pair of rollers (folding forming portions) 44 and 46 which are bent to each other, and a thin steel plate 20 which is formed into an arc shape by the processing of the rollers 44 and 46 is spirally laminated with the comb tooth plate 16 as a reference and wound. The index gear 42, the rollers 44 and 46, and the rotary table 48 are synchronously rotated by a drive mechanism 50.

  In addition, the manufacturing apparatus 40 includes a guide base 54 that guides the thin steel plate 20 in the direction of the rollers 44 and 46, two steel plate pressing bars 56 that are provided slightly parallel to the guide base 54, and a rotary table. And a press 52 (see FIG. 7) that presses and corrects the upper surface of the stator core 10 formed on the surface 48.

  The drive mechanism 50 includes a motor 58 as a drive source, a roller drive unit 60 that rotationally drives the rollers 44 and 46, an index gear drive unit 62 that rotationally drives the index gear 42, and a table drive that rotationally drives the rotary table 48. Part 64.

  The roller drive unit 60 is driven to rotate at the same speed as the first horizontal shaft 66 by a pair of gears 68 and 70 with the same number of teeth as the first horizontal shaft 66 connected to the motor 58 via a predetermined coupling. The second horizontal shaft 72, a drive sprocket 74 provided on the first horizontal shaft 66 for transmitting power to the index gear drive unit 62, and a position where the thin steel plate 20 is bent by the rollers 44 and 46 (hereinafter referred to as the position of the steel plate 20). , Referred to as a processing position P), and a resin-made straightening roller 76 provided in the vicinity of the arrow A direction (the feeding direction of the thin steel plate 20).

  The first horizontal axis 66 and the second horizontal axis 72 are set up and down in parallel, and are in the direction of arrow B of the first horizontal axis 66 below (the direction facing the reverse of the motor 58 and perpendicular to the direction of arrow A). ) Is provided at the end, and the roller 46 is provided at the end of the upper second horizontal shaft 72 in the direction of arrow B. The second horizontal shaft 72 is attached to the swing plate 80 via two bearings 78. The swing plate 80 is pivotally supported by a horizontal swing shaft 81 at one end, and is connected to a bolt 82a extending in the vertical direction in the vicinity of the other end. The bolt 82a and a nut 82b The swing angle is adjusted. Thereby, the height of the second horizontal shaft 72 can be adjusted.

  The positions of the rollers 44 and 46 on the shaft are adjusted so that a concave chip 45 and a convex chip 47, which will be described later, are engaged, and the height of the second horizontal shaft 72 is adjusted by the swing plate 80. In FIG. 1, the swing plate 80 is indicated by a broken line so that the lower portion is not hidden.

  The straightening roller 76 is attached to the swing plate 80 via a bracket 83, the height can be adjusted along the long hole 83a, and the mounting position of the bracket 83 with respect to the swing plate 80 is adjusted. Thus, the position and orientation of the correction roller 76 on the horizontal plane can be adjusted. With such a mechanism, the correction roller 76 is set so as to be slightly above the processing position P in the direction of the arrow A, and is set so as to be directed in the direction of the rotation center of the rotary table 48. . The axes of the first horizontal axis 66, the second horizontal axis 72, and the correction roller 76 are set horizontally.

  The index gear drive unit 62 includes a third horizontal shaft 84 including the index gear 42, a passive sprocket 88 provided at one end of the third horizontal shaft 84, and an umbrella provided at the other end of the third horizontal shaft 84. A tooth gear box 86, a first vertical shaft 92 connected below the bevel gear box 86 so as to be orthogonal to the third horizontal shaft 84, and a drive sprocket provided at a lower portion of the first vertical shaft 92 94.

The passive sprocket 88 is connected to the drive sprocket 74 by a chain 96, and rotates passively when the drive sprocket 74 rotates. The drive sprocket 74 and the passive sprocket 88 have the same number of teeth, and the third horizontal shaft 84 rotates at the same speed as the first horizontal shaft 66 and the second horizontal shaft 72 and clockwise when viewed in the direction of arrow B. The chain 96 is circulated through a lower tensioner mechanism (not shown) on the return side, and is adjusted so that the chain 96 is not loosened.

The plurality of bevel gears provided in the bevel gear box 86 have the same number of teeth, and the first vertical shaft 92 is rotated at the same speed as the third horizontal shaft 84 by the rotation of the third horizontal shaft 84 . Rotate.

  As shown in FIG. 4, the third horizontal shaft 84 extends in the arrow B direction slightly below the guide table 54. The upper one of the eleven index teeth 42 a in the index gear 42 provided on the third horizontal shaft 84 protrudes from the long hole 54 a provided in the guide base 54 and meshes with the gap 17 of the thin steel plate 20. To do.

  As shown in FIG. 5, the table driving unit 64 includes a second vertical shaft 100 that is a rotation shaft of the rotary table 48, a passive sprocket 102 provided on the second vertical shaft 100, and the second vertical shaft 100 at the lower end. And a position guide 106 for guiding the bearing box 104 to be supported in the direction of arrow B.

  The passive sprocket 102 is connected to the drive sprocket 94 by a chain 108, and rotates passively by the rotation of the drive sprocket 94. The rotation direction is counterclockwise when viewed from above.

The number of teeth of the passive sprocket 102 is six times the number of teeth of the drive sprocket 94 , and the first horizontal shaft 66, the second horizontal shaft 72, the third horizontal shaft 84, and the second horizontal shaft 100 are rotated during one rotation of the second vertical shaft 100. One vertical shaft 92 rotates 6 times.

  The chain 108 is set to circulate through the tensioner sprockets 110a and 110b on the return side. The tensioner sprocket 110a and the tensioner sprocket 110b are attached to both ends of a bracket 111 that is elastically urged clockwise as viewed from above about a vertical shaft 111a by a torsion spring (not shown). Adjust automatically so that there is no more. An appropriate support portion may be provided for the chain 108 in order to prevent the chain 108 from sagging downward under its own weight.

  The position guide 106 has a long hole 106a extending in the direction of the arrow B, guides the bearing box 104 along the long hole 106a, and fixes the bearing box 104 to an appropriate position by a predetermined fastening means. it can. Thereby, the turntable 48 can be arranged so as to be in an appropriate position with respect to the processing position P according to the diameter of the stator core 10 to be manufactured. Further, even when the distance between the first vertical shaft 92 and the second vertical shaft 100 is changed by this adjustment, the chain 108 is automatically adjusted by the tensioner sprockets 110a and 110b so that the slack is eliminated.

  The rotary table 48 is a table on which the thin steel plate 20 is wound and the stator core 10 is formed. On the upper surface of the rotary table 48, six inner diameter positions are determined at equal intervals in contact with the inner diameter surface 10a of the stator core 10. A pole 114 is provided, and four teeth positioning poles 116 are provided at equal intervals at positions where the pole 114 is fitted. The inner diameter positioning pole 114 and the teeth positioning pole 116 extend upward, and are higher than the axial width of the stator core 10 to be manufactured.

  As shown in FIG. 6, the roller 44 has eleven concave chips 45 at equal intervals on the outer periphery, and the roller 46 has eleven convex chips 47 at equal intervals on the outer periphery. The roller 44 and the roller 46 have the same diameter, and the convex chip 47 and the concave chip 45 are engaged at the processing position P, and the bent portion 22 can be continuously formed by sandwiching the connecting plate of the thin steel plate 20. . The distance between the concave chips 45 on the outer peripheral surface of the roller 44 and the distance between the convex chips 47 on the outer peripheral surface of the roller 46 are equal to the distance between the bridge portions 26 of the thin steel plate 20. The phase angle of the roller 44 and the roller 46 is adjusted so that the concave chip 45 and the convex chip 47 are engaged with each other.

  The concave chip 45 and the convex chip 47 are fitted into an attachment concave portion 44a provided on the outer peripheral end surface of the roller 44 and an attachment concave portion 46a provided on the outer peripheral end surface of the roller 46, respectively, and fixed by screws 120 from the direction of the back surface in FIG. Has been. The mounting recess 44a and the mounting recess 46a have the same shape.

  The concave portion 45a of the concave chip 45 that is recessed from the outer peripheral surface of the roller 44 has a triangular shape at the end surface in the direction of arrow B, and the cross-sectional area decreases toward the back surface, and the cross-sectional area becomes 0 on the back surface side. It is set to a square pyramid shape. Similarly, the convex portion 47a protruding from the outer peripheral surface of the roller 46 in the convex tip 47 has a triangular shape at the end surface in the arrow B direction of the roller 46, and the cross-sectional area becomes smaller toward the back surface, and is cut off at the back surface side. It is set to a quadrangular pyramid shape with an area of zero. That is, the concave portion 45a and the convex portion 47a are set in a shape capable of forming the bent portion 22. Of course, each concave chip 45 and each convex chip 47 can be individually replaced.

  As shown in FIG. 7, the press 52 is a disk-shaped pressing means and can be moved up and down by a predetermined driving mechanism. The outer diameter of the press 52 is set to be closer to the inner diameter side than the teeth positioning poles 116, and the inner diameter of the press 52 is set to be closer to the outer diameter side than the inner diameter positioning poles 114.

  Next, a procedure for manufacturing the stator core 10 using the manufacturing apparatus 40 configured as described above will be described.

  First, processing such as punching is performed on a long thin plate such as a non-oriented electrical steel plate, and the thin steel plate 20 is cut out and wound on a predetermined reel. At this time, only the portion corresponding to the gap portion 17 between the comb teeth plates 16 is removed from the non-oriented electrical steel plate of the material, and the material utilization rate is high.

  The reel on which the thin steel plate 20 is wound is rotatably installed in the vicinity of the end of the guide base 54, the end of the thin steel plate 20 is pulled out from the reel, and the gap 17 of the comb tooth plate 16 is formed in the long hole 54a. It is made to mesh with the index teeth 42a protruding from.

  Further, depending on the diameter of the stator core 10 to be manufactured, the position of the bearing box 104 on the position guide 106, the positions of the inner diameter positioning pole 114 and the teeth positioning pole 116 on the rotary table 48, the direction and height of the correction roller 76. Is set in advance.

  The position of the bearing box 104 is set such that the distance between the center point of the rotary table 48 and the machining position P is substantially equal to the radius of the stator core 10 when viewed from above. The swing angle of the swing plate 80 is adjusted so that the distance between the first horizontal shaft 66 and the second horizontal shaft 72 is an appropriate distance according to the diameters of the rollers 44 and 46 used and the thickness of the thin steel plate 20. Keep it.

Next, an operation panel (not shown) is operated to rotate the motor 58 at a predetermined speed. The motor 58 rotates counterclockwise (rotation direction in FIG. 3; hereinafter the same). As a result, the first horizontal shaft 66 and the third horizontal shaft 84 rotate counterclockwise, and the second horizontal shaft 72 rotates clockwise. On the other hand, the first vertical shaft 92 and the second vertical shaft 100 rotate counterclockwise when viewed from above. The first horizontal axis 66, the second horizontal axis 72, the third horizontal axis 84, and the first vertical axis 92 rotate at the same speed and six times the second vertical axis 100. The ratio of the speeds of the first horizontal axis 66, the second horizontal axis 72, the third horizontal axis 84, the first vertical axis 92, and the second vertical axis 100 is always constant, and synchronization is maintained.

  The index gear 42 rotates counterclockwise by the third horizontal shaft 84, whereby the upper index teeth 42 a feed the thin steel plate 20 toward the processing position P while meshing with the gap portion 17.

  The thin steel plate 20 sent to the processing position P is bent so that the portions of the gaps 17 in the connecting plate 18 bulge downward by the concave tips 45 and the convex tips 47, and the bent portions 22 are formed. . The center of the bent part 22 is provided in each bridge part 26, and since the bridge part 26 is narrow, it is easy to bend and form.

  By the way, the cross-sectional shape of the bent portion 22 has a larger cross-sectional area in the direction of arrow B at the processing position P, and the degree of processing is larger. Accordingly, the length of the connecting plate 18 as viewed from above becomes shorter in the direction of arrow B, and the thin steel plate 20 is bent into an arc shape. Further, since the curvature of the arc is determined by the size of the bent portion 22, it can be adjusted by the sizes of the convex tip 47 and the concave tip 45.

  The bent portion 22 has a downwardly convex shape. In this case, the thin steel plate 20 is deformed so as to be directed slightly upward from the processing position P. However, the connecting plate 18 of the thin steel plate 20 becomes the correction roller 76. By abutting, it is corrected substantially horizontally and sent out. Since the correction roller 76 is oriented in the direction of the center of rotation of the turntable 48, it is processed into an arc shape to feed the thin steel plate 20 while rotating in contact with the upper surface of the connecting plate 18 accurately. The height can be corrected. Therefore, the thin steel plate 20 does not roll up.

  The first horizontal shaft 66, the second horizontal shaft 72, and the third horizontal shaft 84 are rotated at the same speed, and 11 comb teeth plates 16 are sent out per rotation, and synchronization is maintained. It is. Therefore, the center of the bent portion 22 is always provided in the bridge portion 26.

  The thin steel plate 20 whose delivery direction is corrected to be horizontal continues to be fed in an arc shape, descends due to its own weight according to the feed length, and is wound spirally on the rotary table 48. At this time, a part of the inner side of the connecting plate 18 is brought into contact with the inner diameter positioning pole 114 and positioned so that the inner diameter of the stator core 10 becomes an appropriate value. Further, the teeth positioning poles 116 are fitted into the gap portion 17 of the comb tooth plate 16 at a predetermined interval, so that the phases of the comb tooth plates 16 in the respective layers of the thin steel plate 20 coincide with each other and are laminated. The teeth 14 are properly formed.

  Since the first horizontal axis 66 and the second horizontal axis 72 are set to rotate 6 times while the second vertical axis 100 rotates once, the comb at the processing position P per rotation of the second vertical axis 100 is set. The number of tooth plates 16 fed out and the number of windings of the rotary table 48 coincide with each other at 66, and synchronization is maintained.

  Furthermore, each of the roller 44 and the roller 46 has 11 chips, and the number of the bent portions 22 in one layer of the laminated thin steel plates 20 is 66 that is an integral multiple (6 times) of the 11 pieces. The number of the bent portions 22 formed by one predetermined chip among the convex chips 47 and one predetermined chip among the eleven concave chips 45 is six per layer, and is formed by the same chip. The curved portion 22 is always laminated at the same position. Therefore, even if the shape of each bent portion 22 is slightly different depending on the shape of each convex chip 47 and each concave chip 45 and the mounting direction with respect to the mounting concave portions 44a and 46a (see FIG. 6). The bent portions 22 formed in (1) are arranged at the same position and are laminated without any gaps, so that the teeth 14 having a proper shape with no deviation in the laminating direction can be obtained.

  In addition, since the inner diameter side of the bent portion 22 is substantially triangular, even when the positions of the inner diameter side top portions 22c of adjacent layers are slightly shifted and stacked, the side surface 22d ( Appropriate sliding occurs in FIG. 2), and the inner diameter side top portion 22c matches. Therefore, compared with the case where the inner diameter side end face of the bent portion 22 is semicircular or quadrangular, the phase of the bent portion 22 is easily matched, and the teeth 14 are appropriately formed.

  Next, after the thin steel plates 20 are spirally laminated a predetermined number of times, the motor 58 is stopped and the end portions of the thin steel plates 20 are cut. At this time, after laminating the thin steel plates 20 by an integral multiple of the number of laminations required for the stator core 10, the ends are cut and pressed by a press 52 to be described later, and then every predetermined number of laminations. It may be cut into pieces.

  Next, the rotary table 48 is removed from the second vertical shaft 100 and disposed below the press 52 coaxially.

  At this time, as indicated by a two-dot chain line in FIG. 7, the stator core 10 formed on the rotary table 48 has a substantially truncated cone shape. The stator core 10 in this state is corrected by pressing the back core portion 12 and a part of each tooth 14 with a press 52 so that the stator core 10 has a cylindrical shape. The press 52 does not interfere with the inner diameter positioning pole 114 and the teeth positioning pole 116. Further, since the stator core 10 is supported by the inner diameter positioning pole 114 and the teeth positioning pole 116, the stator core 10 is corrected while maintaining a perfect circle without distortion.

  Next, the inner diameter surface 10a of the stator core 10 is welded to provide a welded portion 24 (see FIG. 1), and adjacent layers are fixed. Moreover, when fixing with an adhesive agent, it is good to make it osmose | permeate between each layer using a thing with a low viscosity, and to dry-solidify after that and to adhere | attach.

  Then, a stator is formed by winding a coil around each tooth 14 of the stator core 10 via an insulating material, and a rotating electrical machine is obtained by combining the stator with a predetermined rotor.

The manufacturing apparatus 40 adjusts the first horizontal shaft 66 and the second horizontal shaft 66 by adjusting the rollers 44 and 46, the diameter and number of teeth of the index gear 42, and the swing plate 80 according to the diameter of the stator core 10 to be manufactured and the number of teeth 14. The distance from the horizontal shaft 72, the position of the bearing box 104 on the position guide 106, and the like may be changed, and the drive sprocket 94 or the passive sprocket 102 may be replaced with one having an appropriate number of teeth. Even when the drive sprocket 94 and the passive sprocket 102 are replaced, the chain 108 is adjusted without slack by the tensioner sprockets 110a and 110b.

  Thus, according to the manufacturing apparatus 40, the stator core 10 of various diameters can be manufactured by exchanging some parts and performing a predetermined adjustment. Further, the manufacturing apparatus 40 is simple, inexpensive, and small without using special parts or complicated mechanisms.

  Furthermore, since the bent portion 22 is basically obtained by bending, there is almost no drawing or plastic flow unlike plastic deformation, and it can be processed with a small force. Moreover, since the big bending part 22 can be obtained, the thin steel plate 20 can be deform | transformed into the circular arc shape of a small curvature, and the stator core 10 of a small diameter is obtained.

  Although the teeth 14 of the stator core 10 are described as facing outward, the teeth 14 may be facing inward depending on the type of rotor corresponding to the stator core 10. In this case, for example, the direction of the thin steel plate 20 on the guide table 54 may be reversed.

  The bent portion 22 has been described as being formed while being sandwiched between the rollers 44 and 46. However, the bent portion 22 is formed by a predetermined press mechanism (folded forming portion) that moves up and down continuously in synchronization with the index gear 42. It may be formed.

  Furthermore, although it has been described that all the bent portions 22 are formed so as to be convex downward, for example, the convex directions of the adjacent bent portions 22 may be alternately turned up and down.

  Although the bent portion 22 has been described as having a quadrangular pyramid shape (see FIG. 2), as shown in FIG. 8, depending on the shape of the convex tip 47 and the concave tip 45 and the degree of force pressing the thin steel plate 20. Alternatively, the bent portion 23 may have a triangular pyramid shape.

  The bent portion 23 has a substantially triangular inner diameter side end, and the inner diameter side end portions 23 a and 23 a coincide with the end portions of the adjacent bent portions 23. It is bent along a line connecting the inner diameter side end 23a and two intermediate points 23b corresponding to the outer diameter side ends 22a and 22a, and is bent along a ridge line connecting the intermediate point 23b and the inner diameter side top 23c. . That is, the bent portion 23 has a substantially triangular pyramid shape convex downward with the surface surrounded by the inner diameter side end portions 23a and 23a and the intermediate point 23b as a reference surface.

  By forming the bent portion 23 having such a shape, the same effect as that obtained by forming the bent portion 22 can be obtained.

  Of course, the stator core and the manufacturing apparatus thereof according to the present invention are not limited to the above-described embodiments, and can adopt various configurations without departing from the gist of the present invention.

It is a perspective view of the stator core which concerns on this Embodiment. It is a partially expanded perspective view for one layer in the laminated thin steel plate. It is a perspective view of the manufacturing apparatus which concerns on this Embodiment. It is a partial cross section enlarged perspective view of a part of guide stand and an index gear. It is a perspective view of the manufacturing apparatus which concerns on this Embodiment. It is an expansion perspective view of the processing position in a manufacturing apparatus. It is explanatory drawing which shows the process of pressing a stator core. It is a partially expanded perspective view for one layer in the thin steel plate which has a bending part which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stator core 12 ... Back core part 14 ... Teeth 16 ... Comb tooth plate 17 ... Gap part 18 ... Connection board 20 ... Thin steel plate 22, 23 ... Bending part 22c, 23c ... Inner diameter side top part 24 ... Welding part 25 ... Bridge part DESCRIPTION OF SYMBOLS 40 ... Manufacturing apparatus 42 ... Index gear 44, 46 ... Roller 45 ... Concave tip 45a ... Concave tip 47 ... Convex tip 47a ... Convex part 48 ... Rotary table 50 ... Drive mechanism 52 ... Press 54 ... Guide stand 58 ... Motor 60 ... Roller drive Section 62 ... Index gear drive section 64 ... Table drive sections 66, 72, 84 ... Horizontal shaft 76 ... Correction roller 86 ... Bevel gear box 92, 100 ... Vertical shaft 96, 108 ... Chain 114 ... Inner diameter positioning pole 116 ... Teeth positioning pole

Claims (7)

In a stator core having an annular back core part and a plurality of teeth extending radially from the back core part,
The teeth and the back core portion are formed by spirally laminating comb-shaped thin steel plates made of a comb-tooth plate and a connecting plate, and the connecting plate forming the back core portion is a radially provided folding plate. Has a curved part,
The circumferential cross-sectional area of the bent portion is set to increase toward the inner diameter direction,
The bent portion has a pyramid shape having a surface surrounded by an outer diameter side end and an inner diameter side end as a reference surface, and having an apex at the inner diameter side top, and further, the outer diameter side end and the inner diameter side A stator core having two triangular side surfaces surrounded by an end portion and the inner diameter side top portion. The stator core according to claim 1, wherein
The stator core is characterized in that the bent portion has a substantially triangular inner end surface. The stator core according to claim 1 or 2,
The stator core is characterized in that the center of the bent portion is provided in each bridge portion that connects each comb tooth plate of the connecting plate. An index sending unit for sending a comb-shaped thin plate steel plate composed of a comb tooth plate and a connecting plate while meshing teeth in a gap between the comb tooth plates;
In a pyramid shape with the surface surrounded by the outer diameter side end and the inner diameter side end as a reference plane and the inner diameter side apex as the apex, with both sides of the connecting plate in the thin steel plate sent out by the index sending part And having two triangular side surfaces surrounded by the outer diameter side end, the inner diameter side end, and the inner diameter side top, and having a cross-sectional area that increases toward one side in the width direction. A bend forming portion that bends the bent portion at a predetermined interval; and
A rotating winding portion that winds the thin steel plate that is formed in the arc shape by forming the bent portion;
A drive mechanism;
Have
The drive mechanism is
A motor as a drive source;
A roller driving unit that rotationally drives a set of rollers that constitute the bending forming unit;
An index gear driving unit that rotationally drives the index gear of the index sending unit;
A table driving unit that rotationally drives a rotary table that constitutes the rotary winding unit;
Have
The said motor drives the said roller drive part, the said index gear drive part, and the said table drive part synchronously, The manufacturing apparatus of the stator core characterized by the above-mentioned. In the stator core manufacturing apparatus according to claim 4,
The bend forming part is a pair of rollers that rotate while pressing the connecting plate from both sides,
The roller has a plurality of bending tips for forming the bent portion around the roller,
The stator core manufacturing apparatus, wherein the number of the bent portions in one layer of the thin steel plates to be laminated is set to an integral multiple of the bending chip. In the stator core manufacturing apparatus according to claim 4 or 5,
The rotary winding part is a teeth positioning pole that fits into the gap part,
An inner diameter positioning portion contacting the inner side of the connecting plate;
An apparatus for manufacturing a stator core, comprising: In the stator core manufacturing apparatus according to any one of claims 4 to 6,
An apparatus for manufacturing a stator core, comprising: a press portion that presses an upper surface of a stator formed on the rotary winding portion.

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