Split core manufacturing device and stator core manufacturing method

Abstract

To reduce the manufacturing costs of a stator core.SOLUTION: A stator core is manufactured by arranging a plurality of split cores each having a notched hole on the inside in the trapezoidal upper base in an annular shape with the upper base on the inside to produce annular members, and then stacking the annular members in the axial direction. A split core manufacturing device manufactures the split cores. The split core manufacturing device includes: moving means for moving a strip steel plate in the longitudinal direction of the strip steel plate; hole punching means for punching notched holes alternately on one side along the longitudinal direction of the strip steel plate and the other opposite side by shifting the relative positions in the longitudinal direction by the moving means; and cutting means for cutting the strip steel plate with the notched holes punched on the side by the hole punching means in a direction perpendicular and oblique to the longitudinal direction by shifting the position in the longitudinal direction by the moving means, thereby generating each of the trapezoidal split cores.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a split core manufacturing apparatus for manufacturing a split core, and a stator core manufacturing method. [Background technology]

[0002] A technology is known in which adjacent split core pieces are staggered on a steel plate so that the radial side surfaces of the yoke portion and the radial side surfaces of the teeth portion face each other, thereby reducing the ineffective area of ​​the steel plate (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-182272 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above technology, for example, when manufacturing stator cores of various shapes, different dies or the like are required for punching out the split cores for each stator core shape, which may increase the manufacturing costs of the stator cores.

[0005] The present disclosure has been made to solve such problems, and has as its main object to provide a split core manufacturing apparatus and a stator core manufacturing method that can reduce the manufacturing costs of stator cores. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the present disclosure is to A split core manufacturing device for manufacturing a stator core by stacking in an axial direction annular members each including a plurality of split cores each having a notched hole in a trapezoidal upper base portion with the upper base portion on the inside, the split cores being arranged in an annular shape, the split cores being manufactured as follows: A moving means for moving the strip steel plate in a longitudinal direction of the strip steel plate; a punching means for punching the notch holes alternately on one side and the opposing other side along the longitudinal direction of the steel strip by shifting the positions of the two sides in the longitudinal direction by the moving means; a cutting means for cutting the strip steel plate, the side edges of which have been punched with notched holes by the hole punching means, in a direction perpendicular to the longitudinal direction and obliquely with respect to the longitudinal direction by the moving means, thereby generating each of the trapezoidal divided cores; Equipped with Split core manufacturing equipment It is. In this embodiment, the shape of the trapezoidal split core may be changed by adjusting at least one of the amount of movement of the strip steel plate by the moving means, the shape of the cutout hole by the hole punching means, and the inclination angle of the cutting means when the cutting means cuts obliquely. In order to achieve the above object, one aspect of the present disclosure is to Punching notch holes alternately on one side and the opposite side along the longitudinal direction of the strip steel plate, with the notch holes offset from each other in the longitudinal direction; a step of cutting the strip-shaped steel plate with the cutout holes punched in the side edges at a position shifted in the longitudinal direction and obliquely in a direction perpendicular to the longitudinal direction to manufacture a plurality of split cores each having a cutout hole in an upper bottom portion of a trapezoidal shape; manufacturing a stator core by stacking the divided cores in an axial direction to form an annular member in which the divided cores are arranged in an annular shape with the upper bottom portion facing inward; Includes Stator core manufacturing method It is. In this aspect, the stator core may be inserted and fixed within a cylindrical ring member. In this one aspect, the stator core inserted into the ring member may be axially pressed and positioned by a positioning member. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a split core manufacturing device and a stator core manufacturing method that can reduce the manufacturing cost of a stator core. [Brief description of the drawings]

[0008] [Figure 1] 1 is a block diagram showing a schematic system configuration of a split core manufacturing device according to an embodiment of the present invention; [Diagram 2] 5A to 5C are diagrams for explaining a method for manufacturing a stator core according to the present embodiment. [Diagram 3] 3 is a flowchart showing a flow of a stator core manufacturing method according to the present embodiment. [Figure 4] 13 is a diagram showing a state in which the stator core is fixed to a ring member. FIG. [Diagram 5] 13A and 13B are views showing protrusions formed on an inner peripheral surface of a ring member. [Figure 6] 1A and 1B are diagrams showing an example of inserting a polygonal stator core into a polygonal ring member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. Fig. 1 is a block diagram showing a schematic system configuration of a split core manufacturing device according to the present embodiment. Fig. 2 is a diagram for explaining a stator core manufacturing method according to the present embodiment.

[0010] The split core manufacturing apparatus 1 according to this embodiment is an apparatus for manufacturing a trapezoidal split core 10. A notched hole 102 is formed in an upper bottom portion 101 of the trapezoidal shape. A plurality of split cores 10 manufactured by the split core manufacturing apparatus 1 are arranged in an annular shape with the upper bottom portion 101 facing inward to generate an annular member 11. The generated annular members 11 are stacked in the axial direction to manufacture a stator core 12 for a motor.

[0011] The split core manufacturing apparatus 1 in this embodiment includes a conveying device 2 that conveys a strip-shaped steel plate 13, a turret punch 3 that punches a notch hole 102 in the strip-shaped steel plate 13, and a cutting device 4 that cuts the strip-shaped steel plate 13.

[0012] The conveying device 2 is a specific example of a moving means. The conveying device 2 moves the strip steel sheet 13, which is an electromagnetic steel sheet, in the longitudinal direction of the strip steel sheet 13.

[0013] The turret punch 3 is a specific example of a hole punching means. The turret punch 3 has, for example, a punch for punching out the strip-shaped steel plate 13, a press part for pressing the punch, and a die for receiving the punch.

[0014] 2, the turret punch 3 punches out notch holes 102, for example, having a substantially rectangular shape, on both longitudinal sides 131, 132 of the strip steel sheet 13. The turret punch 3 punches out notch holes 102 alternately between one longitudinal side 131 and the opposing other longitudinal side 132 of the strip steel sheet 13, with the respective positions shifted from each other in the longitudinal direction.

[0015] The cutting device 4 is a specific example of a cutting means. The cutting device 4 cuts the strip-shaped steel plate 13 using a blade, for example, by a method such as shear cutting, score cutting, or laser cutting.

[0016] The cutting device 4 cuts the strip-shaped steel plate 13, in which a notch hole 102 has been punched on the side edge by the turret punch 3, in a direction perpendicular to the longitudinal direction and at an angle to produce each of the trapezoidal split cores 10.

[0017] Here, the operations of the transport device 2, the turret punch 3, and the cutting device 4 will be described in detail with reference to FIG.

[0018] First, the conveying device 2 feeds the strip steel sheet 13 in the longitudinal direction (FIG. 2(a)). The turret punch 3 punches out a notch hole 102 on one side edge 131 of the strip steel sheet 13 (FIG. 2(b)).

[0019] The conveying device 2 feeds the strip steel plate 13 in the longitudinal direction by a predetermined pitch amount d. The turret punch 3 moves to the other side edge 132 of the strip steel plate 13, and punches out the notch hole 102 in the other side edge 132 (FIG. 2(c)).

[0020] The conveying device 2 feeds the strip steel sheet 13 in the longitudinal direction by a predetermined pitch amount d. The turret punch 3 moves to one side edge 131 of the strip steel sheet 13, and punches out a notch hole 102 at that side edge 131 (FIG. 2(d)). At this time, the cutting device 4 cuts off the leading end of the strip steel sheet 13 in a direction perpendicular to the longitudinal direction and obliquely. The first end piece of the cut strip steel sheet 13 may be discarded.

[0021] The conveying device 2 feeds the strip steel plate 13 in the longitudinal direction by a predetermined pitch amount d. The turret punch 3 moves to the other side edge 132 of the strip steel plate 13, and punches out the notch holes 102 at the other side edge 132. Furthermore, the cutting device 4 cuts the strip steel plate 13 in a direction perpendicular and oblique to the longitudinal direction, thereby generating trapezoidal divided cores 10 (FIG. 2(e)).

[0022] The conveying device 2, the turret punch 3 and the cutting device 4 cooperate to repeat the above-mentioned operations, thereby continuously producing the trapezoidal divided cores 10.

[0023] The generated split cores 10 are arranged in an annular shape with the upper bottom portion 101 facing inward to generate an annular member 11 (FIG. 2(f)). The generated annular members 11 are stacked in the axial direction to manufacture the stator core 12.

[0024] As described above, the turret punch 3 punches the notch holes 102 alternately on one and the other side edges 131, 132 of the strip steel sheet 13, shifting their positions relative to each other in the longitudinal direction. Furthermore, the cutting device 4 cuts the strip steel sheet 13, in which the notch holes 102 have been punched on the side edges 131, 132 by the turret punch 3, in a direction perpendicular and oblique to the longitudinal direction, thereby continuously producing the trapezoidal divided cores 10.

[0025] The split core manufacturing apparatus 1 of this embodiment can easily change the shape of the trapezoidal split core 10 by simply adjusting at least one of the following: the amount of movement (predetermined pitch amount d) of the strip steel plate 13 by the conveying device 2, the shape (vertical and horizontal dimensions of the rectangle) of the cutout hole 102 by the turret punch 3, and the inclination angle θ of the blade when the cutting device 4 cuts diagonally (the inclination angle with respect to the vertical direction).

[0026] As a result, even when manufacturing stator cores 12 of various shapes, it is not necessary to use different dies for punching out split cores 10 for each shape of stator core 12, and only the above adjustment is required. This reduces the manufacturing cost of stator cores 12. For example, stator cores 12 with different numbers of poles can be easily produced in a mixed flow on the same press line.

[0027] Furthermore, the only useless portions of the strip steel plate 13 that arise when manufacturing the split core 10 consist of the end piece of the strip steel plate 13 that is generated when the cut holes 102 are punched out and the initial end piece of the cut strip steel plate 13, resulting in good yield and reduced manufacturing costs for the stator core 12.

[0028] Next, a detailed description will be given of the method for manufacturing a stator core according to the present embodiment. Fig. 3 is a flowchart showing the flow of the method for manufacturing a stator core according to the present embodiment.

[0029] The turret punch 3 punches out the notched holes 102 alternately in one side 131 and the opposing other side 132 along the longitudinal direction of the strip-shaped steel plate 13, with the positions shifted from each other in the longitudinal direction (step S101).

[0030] The cutting device 4 cuts the strip-shaped steel plate 13, in which the cutout holes 102 have been punched on the side edges 131, 132 by the turret punch 3, in a direction perpendicular to the longitudinal direction and obliquely, thereby manufacturing each of the plurality of trapezoidal divided cores 10 (step S102).

[0031] The split cores 10 manufactured as described above are arranged in an annular shape with the upper bottom portion 101 facing inward to produce the annular member 11. The annular members 11 thus produced are stacked in the axial direction to manufacture the stator core 12 (step S103).

[0032] The stator core 12 manufactured as described above is inserted into and fixed in a cylindrical ring member 14 by a method such as shrink fitting or press fitting. Fig. 4 is a diagram showing a state in which the stator core 12 is fixed to the ring member 14.

[0033] Here, the trapezoidal divided cores 10 are arranged in an annular shape with the upper base 101 facing inward, so that the lower base of the trapezoid forms the outer periphery of the annular member 11. For this reason, as shown in Fig. 4, the outer periphery of the annular member 11 (stator core 12) is polygonal.

[0034] On the other hand, the inner circumference of the cylindrical ring member 14 is, for example, circular. Therefore, the stator core 12 is fixed in the ring member 14 such that only vertices 121 of the polygon of the stator core 12 are partially in contact with the inner circumference of the cylindrical ring member 14.

[0035] This reduces the radial compressive stress applied to the stator core 12. Furthermore, since a gap X is generated between the outer circumferential surface of the stator core 12 and the inner circumferential surface of the ring member 14, the stator core 12 can be efficiently cooled by flowing a coolant through this gap X. This makes it possible to suppress the deterioration of the iron loss of the stator core 12.

[0036] The coolant is preferably, for example, cooling oil (ATF (Automatic transmission fluid) or the like), but is not limited thereto, and may be, for example, water, a liquid metal such as mercury, or a gas such as air or ammonia gas. Any coolant may be used as long as it can properly fix stator core 12 and can flow the coolant through the gap to efficiently and directly cool stator core 12.

[0037] As described above, the stator core 12 is structured to be partially fixed within the ring member 14. Therefore, it is preferable to reinforce the fixing force that fixes the stator core 12 in the axial direction. Alternatively, the stator core 12 inserted into the ring member 14 may be positioned by being pressed in the axial direction by a positioning portion 15, as shown in FIG.

[0038] As an example of the positioning portion 15, a part of the upper end of the ring member 14 may be subjected to half punching with a louver punch 101 or the like to form a protrusion 151 that protrudes inward on the inner peripheral surface of the ring member 14. Four protrusions 151 are formed at intervals of 90° around the circumference of the ring member 14, but the number is not limited to this and may be, for example, two or eight, and any number of protrusions 151 may be formed.

[0039] Furthermore, in the half-punching process, even if pressure is applied up to the shear stress of the protruding portion 151, it still functions as positioning. Therefore, positioning can be performed with a very large force. For example, if the tensile strength of the material (ring member 14) is 28 kg / mm ​​and the plate thickness is 2.6 mm, the shear stress of the protruding portion 151 is calculated as follows.

[0040] Shear stress of protrusion 151 = tensile strength of material x plate thickness =28kg / mm×2.6mm =72.8kg / mm

[0041] Therefore, since the weight of stator core 12 is about several kg, it is found that the fixing force is sufficient if stator core 12 is fixed with a force equivalent to the shear stress of protruding portion 151 as described above. The protruding amount of protruding portion 151 may be, for example, about 0.5 to 3 mm.

[0042] The upper end of stator core 12 is fixed by protrusion 151, and the lower end of ring member 14 is fixed by bolt 152 or the like. Axial force is generated in the axial direction by screwing bolt 152 in the axial direction. This axial force holds stator core 12 in the axial direction, ensuring reliable positioning.

[0043] Furthermore, it is preferable that the lower part of ring member 14 is formed with relief shape 141 that is outwardly relieved with respect to the outer circumferential surface of stator core 12. This can further reduce the compressive stress on stator core 12 and further suppress the iron loss of stator core 12.

[0044] 6, a polygonal stator core 120 may be inserted into a polygonal ring member 140. By making R of the polygonal stator core 120 larger than R of the polygonal ring member 140, a gap X can be formed between the outer periphery of the stator core 120 and the inner periphery of the ring member 140, and a refrigerant can be flowed through this gap X to efficiently cool the stator core 120. Also, an annular stator core may be inserted into the polygonal ring member.

[0045] Although some embodiments of the present disclosure have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0046] 1 split core manufacturing device, 2 conveying device, 3 turret punch, 4 cutting device, 10 split core, 11 annular member, 12 stator core, 13 strip steel plate, 14 ring member, 15 positioning portion, 101 upper bottom portion, 101 louver punch, 102 notch hole, 121 apex, 131 one side edge, 132 other side edge, 141 relief shape, 151 protrusion, 152 bolt

Claims

1. A split core manufacturing device for manufacturing a stator core by stacking in an axial direction annular members each including a plurality of split cores each having a notched hole in a trapezoidal upper base portion with the upper base portion on the inside, the split cores being arranged in an annular shape, the split cores being manufactured as follows: A moving means for moving the strip steel plate in a longitudinal direction of the strip steel plate; a punching means for punching the notch holes alternately on one side and the opposing other side along the longitudinal direction of the steel strip by shifting the positions of the two sides in the longitudinal direction by the moving means; a cutting means for cutting the strip steel plate, the side edges of which have been punched with notched holes by the hole punching means, in a direction perpendicular to the longitudinal direction and obliquely with respect to the longitudinal direction by the moving means, thereby generating each of the trapezoidal divided cores; Equipped with Split core manufacturing equipment.

2. The split core manufacturing apparatus according to claim 1, The shape of the trapezoidal divided core is changed by adjusting at least one of the movement amount of the strip steel plate by the moving means, the shape of the notch hole by the hole punching means, and the inclination angle of the cutting means when the cutting means cuts obliquely. Split core manufacturing equipment.

3. Punching notch holes alternately on one side and the opposite side along the longitudinal direction of the strip steel plate, with the notch holes offset from each other in the longitudinal direction; a step of cutting the strip-shaped steel plate with the cutout holes punched in the side edges at a position shifted in the longitudinal direction and obliquely in a direction perpendicular to the longitudinal direction to manufacture a plurality of split cores each having a cutout hole in an upper bottom portion of a trapezoidal shape; manufacturing a stator core by stacking the divided cores in an axial direction to form an annular member in which the divided cores are arranged in an annular shape with the upper bottom portion facing inward; Includes A method for manufacturing a stator core.

4. 4. The method for manufacturing a stator core according to claim 3, The stator core is inserted into and fixed in a cylindrical ring member. A method for manufacturing a stator core.

5. 5. The method for manufacturing a stator core according to claim 4, The stator core inserted into the ring member is pressed and positioned in the axial direction by a positioning member. A method for manufacturing a stator core.

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