JP6509373B2 - Core sheet, divided laminated core and stator, and method of manufacturing divided laminated core - Google Patents

Description

  The present invention relates to a core sheet punched from a thin plate-like steel plate used for manufacturing a rotary electric machine or a transformer, a divided laminated core formed by laminating a plurality of core sheets, and a stator wound with coils insulated on a plurality of divided laminated cores. The present invention relates to a method of manufacturing a split laminated core.

  The laminated core is manufactured by punching a core sheet from a thin plate-like steel sheet and laminating and bonding a plurality of core sheets, and is used as a core of a rotary electric machine, a core of a transformer, or the like. In the conventional manufacturing method of laminated core, a fixing means by caulking is used during lamination of core sheets, but there is also disclosed a manufacturing method of laminated core in which no caulked portion is left in the product for the purpose of reducing iron loss of the product. (See, for example, Patent Document 1).

  In the method of manufacturing a laminated core described in Patent Document 1, first, a core sheet in which a core portion used as a product and a scrap portion pushed back by push back after punching are integrated using a progressive press die Punch out of steel plate. The push back here means that the punched part is punched out from the steel plate in a half punched state or completely punched state to be almost separated, and then the punched part is again pushed back into the punched hole. is there.

  Next, the core sheets punched out are sequentially laminated in a die of a press die, and a laminated core is formed by temporarily binding the laminated core sheets every predetermined number of sheets using a caulking part provided in the scrap part. . Next, after the core part of the laminated core taken out from the progressive press die is permanently bound by adhesion or welding, the scrap part is removed to obtain a laminated core to be a product. According to such a manufacturing method, the core loss of the laminated core can be reduced and the magnetic performance of the laminated core can be improved because the joining means such as the caulking portion does not remain in the laminated core itself as a product.

[Patent Document 1] Japanese Patent Application Publication No. 2007-295668 (0013 stage, FIG. 3)

  However, in the method of manufacturing the laminated core described in Patent Document 1, when the scrap portion is to be removed to the outside in the radial direction of the laminated core, the engagement convex portion needs to be deformed to the slit side. Power will be needed, and the equipment will be enlarged. In addition, when the outer peripheral surface of the laminated core in the vicinity of the engagement convex portion is deformed and the laminated core is pressed into the frame accommodating the laminated core, the above-mentioned deformation that occurs on the outer peripheral surface of the core portion at the time of separation of the scrap portion As a result, there is a problem that the assemblability of the frame and the laminated core is impaired, and the roundness of the stator is deteriorated.

  In addition, as in the method of manufacturing the laminated core described in Patent Document 1, when the engagement convex portion has a dovetail shape that is reduced toward the radial outer side of the laminated core, the dovetail groove is expanded in the circumferential direction. Since the magnetic path width at the connection between the laminated teeth and the laminated divided back yoke becomes smaller due to the circumferential expansion of the bottom, the resistance of the magnetic circuit of the laminated core increases, and the torque of the motor utilizing this increases. There was a problem that it was impossible.

  Further, when it is intended to remove the scrap portion in the laminating direction of the laminated core, the upper and lower end faces of the laminated core are provided with insulating members for electrically insulating the coil wound on the laminated core and the laminated core. , It is necessary to design these insulating members and scrap parts so that the scrap parts can move in the stacking direction, and the mutual shape becomes complicated, and it is difficult to secure insulation and secure rigidity of the engagement convex parts. was there.

  Furthermore, when the scrap part is slid in the laminating direction, even a slight displacement between the core sheets constituting the lamination increases the force required to separate the scrap part, thereby causing deformation in the laminated core and causing the laminated core to There is a problem in that the assembling accuracy is deteriorated, high processing accuracy is required to prevent the problem, and there is a problem in that the manufacturing cost of the product is increased.

  The present invention has been made to solve the above-described problems, and a stator with high circularity can be manufactured with small equipment, and a laminated core can be secured while securing the freedom of design of the insulating member and the laminated core. It is an object of the present invention to provide a method of manufacturing a core sheet, a split laminated core, a stator, and a split laminated core which can improve the magnetic performance of the product and improve the assembly accuracy and the workability of the product.

The core sheet according to the present invention is
A T-shaped core portion comprising: a split back yoke portion; and a teeth portion protruding from a central portion of the split back yoke portion;
It consists of a scrap part fitted in the center of the diameter direction outside which is the side opposite to the side where the above-mentioned teeth part of the above-mentioned division back yoke part was protrusively provided,
The divided back yoke portion is provided with a fitting recess which is recessed in a step-like manner so that the circumferential width is narrowed inward in the radial direction at the central portion of the outer peripheral surface.
The scrap portion is made of a magnetic material that includes a step-like fitting projection that protrudes inward in the radial direction and that engages with the fitting recess.

In the divided and laminated core according to the present invention, a plurality of the core portions are laminated.
Moreover, the stator according to the present invention is provided with a coil in which a plurality of the divided laminated cores are combined in a ring shape and wound around the laminated teeth portion of each of the divided laminated cores.

A method of manufacturing a split laminated core according to the present invention includes: a T-shaped core portion including a split back yoke portion and a teeth portion protruding from a central portion of the split back yoke portion;
Core sheet punching step of punching out from a magnetic material a core sheet comprising a scrap portion fitted at the radially outer center opposite to the side on which the teeth portion of the divided back yoke portion is protrusively provided. ,
The divided back yoke portion is provided with a fitting recess which is recessed in a step-like manner so that the circumferential width is narrowed inward in the radial direction at the central portion of the outer peripheral surface.
The scrap portion is provided with a step-like fitting projection which protrudes inward in the radial direction, which is fitted to the fitting recess,
After forming the fitting recess at the same time as punching out the fitting protrusion, the fitting projection for pressing the fitting protrusion back to the fitting recess to fit and fix the fitting protrusion and the fitting recess Core sheet punching process having a forming process;
A core sheet laminating step of laminating a plurality of the core sheets;
A scrap portion fixing step of temporarily bonding the scrap portions axially adjacent to each other;
An inter-stack fixing step of fully binding the core portions axially adjacent to each other;
A laminated scrap part which is pulled out radially outward from the laminated scrap part which is the part in which the scrap part is laminated after the inter-lamination fixing step, and is separated and separated from the divided laminated core which is the part in which the core part is laminated. And a separation step.

  According to the method of manufacturing the core sheet, the divided laminated core, the stator, and the divided laminated core according to the present invention, the shape of the laminated fitting convex portion of the laminated scrap portion to be removed from the divided laminated core is inward in the radial direction of the divided laminated core. Since it is a step shape which becomes smaller toward the direction, the laminated scrap portion can be easily removed radially outward from the divided laminated core. Since deformation of the split laminated core can be prevented at the time of separation work, a stator with high assembly accuracy and roundness can be manufactured.

  Further, since restriction on the shape of the insulator can be reduced as compared with the prior art, neither the function of the insulator to be attached nor the rigidity of the split laminated core is impaired. Furthermore, the magnetic path width at the connection portion between the laminated tooth portion of the divided laminated core and the divided laminated back yoke portion is formed by forming the laminated fitting convex portion in a step shape in which the width in the circumferential direction narrows inward in the radial direction. Therefore, there is no concern of increasing the resistance of the magnetic circuit of the stator, and it is possible to provide a method of manufacturing a core sheet with a small core loss, a divided laminated core, a stator, and a divided laminated core.

They are a perspective view and a top view of a stator concerning Embodiment 1 of this invention. It is a perspective view of the core sheet laminated body which attached the insulation member which concerns on Embodiment 1 of this invention. It is a top view of a core sheet concerning Embodiment 1 of this invention. It is a top view which shows the core sheet punching process which pierces and forms the core sheet which concerns on Embodiment 1 of this invention from a magnetic steel plate. It is the perspective view and top view which show the coil winding process which concerns on Embodiment 1 of this invention. It is a perspective view and a top view of a core sheet layered product after coiling concerning Embodiment 1 of this invention. It is the perspective view and top view which show the lamination | stacking scrap part isolation | separation process which removes the lamination | stacking scrap part which concerns on Embodiment 1 of this invention from a division | segmentation lamination | stacking core. It is a block diagram of the resin-made insulator which concerns on Embodiment 1 of this invention, and a perspective view after an assembly.

Embodiment 1
Hereinafter, a method of manufacturing the core sheet, the divided laminated core, the stator, and the divided laminated core according to the first embodiment of the present invention will be described with reference to the drawings.
In the present specification, the terms “axial direction”, “circumferential direction”, “radial direction”, “inner side”, “outside”, “inner circumferential surface”, and “outer circumferential surface” are referred to respectively without particular notice. The term “axial direction”, “circumferential direction”, “radial direction”, “inner side”, “outside”, “inner circumferential surface”, and “outer circumferential surface” of the stator are used.

Fig.1 (a) is a perspective view of the stator 100 based on Embodiment 1 of this invention, FIG.1 (b) is the top view.
The stator 100 is composed of twelve split laminated cores 110 combined in an annular shape, and a coil 4 wound around the laminated tooth portion 110 b of the split laminated core 110 via a resin insulator 5.

  FIG. 2 is a perspective view of a core sheet laminate 130 in which a portion (coil winding portion) on which the coil 4 is wound is molded by the insulator 5. The core sheet laminate 130 is axially fitted to the central portion of the outer peripheral surface of the divided laminated core 110 and the divided laminated back yoke portion 110 a of the divided laminated core 110 so as to extend in the axial direction, and protrudes outward in the radial direction It comprises the laminated scrap portion 120.

FIG. 3 is a plan view of the core sheet 13 that constitutes each lamination of the core sheet laminate 130.
The core sheet 13 includes a core portion 11 which is a product portion and a scrap portion 12 which is fitted and fixed to the core portion 11 by pushback. The core portion 11 has a substantially T-shape including divided back yoke portions 11a and teeth portions 11b, and teeth portions 11b are provided to project from the central portion of the divided back yoke portions 11a.

  As shown in FIG. 3, in the center of the outer peripheral surface opposite to the side on which the teeth 11b of the divided back yoke 11a are provided, the scrap 12 is fitted and fixed in a stepped manner. The recess 11 c is provided. Further, on both ends of the divided back yoke portion 11a, an engagement concave portion 11d and an engagement convex portion 11e with which the core portions 11 adjacent to each other when the stator 100 is formed are engaged are provided.

  The scrap portion 12 is a core sheet laminated body 130 in which the core sheet 13 is laminated and the fitting convex portion 12a which protrudes inward in the radial direction in a step shape which is fitted and fixed to the fitting concave portion 11c of the divided back yoke portion 11a. And a holding portion 12b used for holding and fixing the same by a manufacturing apparatus such as a winding machine.

  The shape of the fitting recess 11 c and the fitting protrusion 12 a is characterized in that it has a step-like shape in which the width in the circumferential direction narrows inward in the radial direction. Tee according to the present embodiment in comparison with magnetic path width W0 at the connection portion of the tooth portion and the divided back yoke portion of the core piece having the dovetail shaped engaging portion of the prior art shown by the two-dot chain line in FIG. The magnetic path width W1 at the connection portion between the portion 11b and the divided back yoke portion 11a can be wide. Thereby, the resistance of the magnetic circuit of the split laminated core 110 using the core sheet 13 can be reduced compared to the prior art, and the torque characteristics of the motor using the stator 100 can be improved.

  Further, the fitting convex portion 12a has a symmetrical shape with respect to a line segment P that divides the tooth portion 11b in the radial direction, and the line segment P and the parallel planes H1 to H parallel to each other at the circumferential end It has H4. Thereby, even if the scrap portion 12 is pressed into the core portion 11 in the manufacturing process of the core sheet 13, no force is generated to push the scrap portion 12 outward in the radial direction of the core portion 11. It can be maintained. In the present embodiment, the fitting convex portion 12a has a two-step stepped shape, but the number of steps is three steps in accordance with the width dimension of the divided back yoke portion 11a necessary to increase / decrease the engagement strength and secure the magnetic circuit. The above may be changed.

  The grip portion 12 b has a tapered shape in which the width narrows outward in the radial direction of the core sheet 13. This is to facilitate positioning of the coil with a manufacturing device such as a winding machine. Moreover, the notch 12c is provided in the side surface of the circumferential direction in the holding part 12b, and when fixing to a manufacturing apparatus or removing the lamination | stacking scrap part 120, it becomes a part latched.

  Recessing recesses 12d and fixing protrusions 12e are provided on the front and back surfaces of the scrap portion 12, respectively. The core sheet 13 is fixed in the stacking direction by caulking the fixing concave portions 12d and the fixing convex portions 12e of the scrap portions 12 adjacent to each other in the stacking direction, when the core sheet 13 is stacked. It goes without saying that either of the fixing concave portion 12d and the fixing convex portion 12e may be provided on the surface, and is not necessary for the laminated end face.

  The lamination | stacking scrap part 120 of the core sheet laminated body 130 laminated | stacked and crimped and fixed plays a role of the fixing | fixed part for temporarily binding the laminated | stacked core part 11 in a lamination | stacking state. The temporarily-bound core sheet laminate 130 is integrally molded by the insulator 5 by die-cast molding in a state of being temporarily bound, to form a permanently-bound core sheet laminate 130.

  As described above, the laminated scrap portion 120 can be used not only for temporarily tying the core sheets 13 together, but also for holding during transport of the insulating resin to the molding machine and for positioning in the molding die. Since the split laminated core 110 in the temporarily bundled state does not have a portion directly fixing the layers to each other, the bond is weak, and there is a concern that the core sheets 13 may be separated during transportation. Therefore, here, immediately after the core sheet laminate 130 is formed, the insulator 5 is integrally molded with the split laminated core 110 to permanently fix the layers of the split laminated core 110.

  The part where the core part 11 of the core sheet 13 is laminated becomes the divided laminated core 110 of the core sheet laminated body 130, and the divided back yoke part 11a is divided into the divided laminated back yoke part 110a, and the teeth part 11b is laminated into the laminated teeth part 110b, The same applies to the case where the fitting recess 11c is the stacking fitting recess 110c, the scrap portion 12 is the stacking scrap portion 120, the fitting protrusion 12a is the stacking fitting protrusion 120a, and the other portions are.

  By the way, in the laminated scrap portion separating step of removing the laminated fitting convex portion 120a of the laminated scrap portion 120 described later from the laminated fitting concave portion 110c of the divided laminated back yoke portion 110a, the divided laminated back yoke portion 110a is deformed and the divided laminated back yoke is formed. When the outer peripheral surface of the portion 110a is burred and the outer peripheral surface of the divided laminated back yoke portion 110a is held to form the stator 100, there is a concern that the roundness of the stator 100 can not be secured. Therefore, in the present embodiment, a notch 11f slightly recessed in the radial direction is provided at the center of the outer peripheral surface of the divided back yoke portion 11a of the core sheet 13, and the fitting recess 11c is disposed in the notch 11f. ing. Thereby, even if the above-mentioned burrs occur, the burrs do not stick out on the outermost peripheral surface of the stator 100, and the roundness of the stator 100 can be secured.

  The laminated scrap portion 120 is formed by integrally forming the insulator 5 with the divided laminated core 110 and winding the coil 4 on the laminated teeth portion 110 b, and then pulling out the radially outer side (A direction in FIG. 2) of the divided laminated core 110. By this, it becomes possible to remove from the laminated fitting concave portion 110c of the divided laminated back yoke portion 110a.

Next, a method of manufacturing the stator 100 in the present embodiment will be described in detail.
FIG. 4 is a view showing a core sheet punching step of punching and forming the core sheet 13 from a magnetic steel sheet using a press die.
As shown in FIG. 4, the core sheet punching process proceeds in the direction of the arrow B pointing to the right. The hatched portions in the figure are portions sequentially punched out in the core sheet punching step.
FIG. 4 (a) shows the first step, FIG. 4 (f) shows the last step, and the drawing in the direction of the downward arrow C in the drawing is a plan view of the core sheet 13 after the punching is completed.

  First, in the pilot hole punching process shown in FIG. 4 (a), two pilot holes 15 serving as a reference for positioning in each subsequent press work are formed on the thin steel plate 14 made of a magnetic material such as an electromagnetic steel plate. You will be punched out. The steel plate 14 has a thickness of 0.2 to 0.5 mm. When one process is completed, the steel plate 14 is conveyed by a predetermined size (the distance between the pilot holes 15 adjacent to each other in the longitudinal direction of the steel plate 14), and the process proceeds to the next process.

  Subsequently, in the notching and punching step shown in FIG. 4B, notches for forming a portion to be the notches 12c provided in the grip portion 12b with the pilot holes 15 formed in the steel plate 14 as the reference position. Sixteen are punched out. Next, in the gripping part outer periphery punching step shown in FIG. 4C, the area 17 including the outer periphery of the part to be the gripping part 12b of the scrap part 12 and the outer peripheral part around the fitting recess 11c of the divided back yoke part 11a You will be punched out.

  Subsequently, in the fixing asperity forming step shown in FIG. 4D, the core sheets 13 adjacent to each other at the time of lamination are fixed by caulking on the front and back surfaces of the central portion of the grip portion 12b of the scrap portion 12, respectively. The fixing recess 12 d and the fixing protrusion 12 e are simultaneously formed by press processing.

  Next, in the fitting concavo-convex part forming step shown in FIG. 4E, after the fitting convex part 12a of the scrap part 12 is punched out and the fitting concave part 11c is simultaneously formed, the fitting convex part 12a is fitted into the fitting concave part 11c. Push back on to fit and fix both.

  Subsequently, in the outer periphery punching step shown in FIG. 4F, the outer periphery of the core portion 11 other than the portion included in the area 17 punched out in the gripping portion outer periphery punching step is punched out. As a result, the core sheet 13 is cut out, which includes the scrap portion 12 and the core portion 11 in which the fitting convex portion 12a of the scrap portion 12 is fitted and fixed in the fitting concave portion 11c of the divided back yoke portion 11a.

  A desired number of core sheets 13 are cut out in the steps of FIG. 4A to FIG. 4F, sequentially laminated, and fixed by caulking the fixing recess 12d and the fixing protrusion 12e provided in the scrap portion 12 By repeating (the scrap portion fixing step), the core sheet laminate 130 in which the desired number of core sheets 13 are temporarily bound by the lamination scrap portion 120 is obtained (core sheet laminating step).

Next, a molding step (interlayer bonding fixing step) of integrally forming the insulator 5 on the split laminated core 110 is performed.
The core sheet laminated body 130 in the temporary binding state by the laminated scrap portion 120 is fixed to the mold of the insulator forming machine in a state in which the laminated gripping convex portion 120 b is gripped. The split laminated core 110 is integrally molded by die cast molding, and as shown in FIG. 2, the laminated teeth portion 110 b and the periphery thereof are covered with an insulator 5 to be permanently bonded.

Next, a coil winding process of winding the coil 4 around the split laminated core is performed.
Fig.5 (a) is a perspective view which shows a coil winding process, FIG.5 (b) is the top view.
Fig.6 (a) is a perspective view of the core sheet laminated body 130 after winding the coil 4, and FIG.6 (b) is the top view.
As shown in FIGS. 5 (a) and 5 (b), the winding machine 300 is in a state in which the permanently laminated split laminated core 110 remains fitted with the laminated scrap portion 120 (as it is the core sheet laminated body 130). The coil 4 is wound by this.

  First, the laminated gripping convex portion 120 b of the laminated scrap portion 120 is positioned on the gripping portion 31 a of the winding machine 300. Next, the core sheet laminated body 130 is gripped by pressing the laminated teeth portion 110 b from the opposite side to the gripping portion 31 a side as shown in FIG. 6 by the pressing portion 31 b of the winding machine 300. At this time, the rotation axis of the grip portion 31a of the winding machine 300, the rotation axis of the pressing portion 31b, and the radial center axis of the laminated teeth portion 110b are aligned on a straight line.

  Next, by rotating the holding part 31a and the pressing part 31b of the winding machine 300, the magnet wire is wound around the laminated tooth part 110b from the nozzle 32 via the insulator 5. Thus, the coil 4 is wound around the laminated teeth portion 110 b of the divided laminated core 110.

  Since the laminated holding convex portion 120b can be used for transporting and positioning the core sheet laminated body 130 to the winding machine 300, there is no need to provide a positioning groove or the like in the divided laminated back yoke portion 110a. The magnetic circuit of the split laminated core 110 can be made large. In addition, the lamination | stacking holding | grip convex part 120b is made into the taper shape which becomes thin toward the radial direction outer side of the core sheet laminated body 130, The positioning by the holding part 31a of the winding machine 300 which is the same shape inside is easy. it can.

After winding the coil 4, next, a laminated scrap part separation process is performed.
FIG. 7A is a perspective view showing a laminated scrap portion separating process of removing the laminated scrap portion 120 from the divided laminated core 110 using the separation tool T, and FIG. 7B is a plan view thereof. The laminated fitting convex portion 120 a of the laminated scrap portion 120 is pulled out from the laminated fitting concave portion 110 c of the divided laminated core 110 radially outward (in the direction of arrow A in FIG. 7) and removed.

  As shown in FIG. 7B, since the lamination notch 120c is formed on both sides in the circumferential direction of the laminated scrap portion 120, the separation tool T can reliably hold the laminated scrap portion 120, and lamination is performed. The separation of the scrap portion 120 from the split laminated core 110 is facilitated. In the present embodiment, the laminated scrap portion 120 is removed after the coil 4 is wound, but the insulating resin may be die-cast molded to form the insulator 5 before the coil 4 is wound.

  After winding the coil 4 and removing the laminated scrap portion 120, the laminated tooth portions 110b of the plurality of divided laminated cores 110 project inward toward the center direction, and the divided laminated back yoke portion 110a is substantially circular. They are connected in an annular fashion to obtain the stator 100.

  In the above description, in the method of manufacturing the split laminated core 110, a case is described in which the split lamination core 110 temporarily bonded by the stacked scrap portion 120 is integrally formed by the insulator 5, and the final binding between the layers is performed. As described in detail in the above, the divided laminated core 110 may be covered with a molding of an insulating resin, and the coil 4 may be wound to form a permanent bundle.

FIG. 8A is a configuration diagram of the resin insulators 5a and 5b.
FIG. 8B is a perspective view of the core sheet laminate 130 to which the resin insulators 5a and 5b are attached.
In order to attach the resin insulators 5a and 5b to the divided laminated core 110, first, the core sheet laminated body 130 in the temporary binding state in which each process of FIGS. 4A to 4F is finished is shown in FIG. The holding portion 31a and the pressing portion 31b of the winding machine 300 sandwich and fix.

  Next, resin insulators 5a and 5b are placed on the lamination teeth portion 110b and its periphery from the top and bottom of the split laminated core 110 in the temporary binding state, and the coil 4 is wound on them. As a result, the layers between the laminations 110 are firmly bound by the coil 4. At this time, the resin insulators 5a and 5b restrain the circumferential side wall of the laminated tooth portion 110b of the divided laminated core 110, and the coil 4 restrains the lamination direction of the laminated tooth portion 110b, and also bonds in the circumferential direction. Make it strong.

  In the above description, the main bundling is performed by mounting the resin insulators 5a and 5b and winding the coil 4. However, portions where the resin insulators 5a and 5b put from the top and the bottom are opposed to each other in the axial direction If the fitting direction is provided to constrain the stacking direction, it is possible to carry out the final bundling of the layers of the split laminated core 110 only by mounting the resin insulators 5a and 5b.

  According to the method of manufacturing the core sheet, the divided laminated core, the stator, and the divided laminated core according to the first embodiment of the present invention, the shape of the laminated fitting convex portion 120a of the laminated scrap portion 120 removed from the divided laminated core 110 is The step-like shape which becomes smaller inward in the radial direction of the split laminated core 110 enables the laminated scrap portion 120 to be easily removed radially outward from the split laminated core 110. Since deformation of the split laminated core 110 can be prevented at the time of separation work, the stator 100 with high assembly accuracy and roundness can be manufactured.

  In addition, since restrictions on the shape of the insulator 5 can be reduced as compared with the prior art, neither the function of the insulator 5 to be attached nor the rigidity of the split laminated core 110 is impaired. Furthermore, by forming the lamination fitting convex portion 120a in a step shape in which the width in the circumferential direction is narrowed toward the inner side in the radial direction, the connection portion between the lamination tooth portion 110b of the divided lamination core 110 and the divided lamination back yoke portion 110a Since the magnetic path width W1 can be increased, there is no concern of increasing the resistance of the magnetic circuit of the stator 100, and a method of manufacturing the core sheet 13 with a small core loss, the laminated core, the stator 100, and the laminated core can be provided.

  In the present invention, within the scope of the invention, the embodiment can be appropriately modified or omitted.

Claims (11)

A T-shaped core portion comprising: a split back yoke portion; and a teeth portion protruding from a central portion of the split back yoke portion;
It consists of a scrap part fitted in the center of the diameter direction outside which is the side opposite to the side where the above-mentioned teeth part of the above-mentioned division back yoke part was protrusively provided,
The divided back yoke portion is provided with a fitting recess which is recessed in a step-like manner so that the circumferential width is narrowed inward in the radial direction at the central portion of the outer peripheral surface.
The core sheet made of a magnetic material, wherein the scrap portion includes a step-like fitting protrusion protruding inward in the radial direction, which is fitted to the fitting recess. The core sheet according to claim 1, wherein the circumferential end faces of the fitting recess are all formed in parallel with each other. The scrap unit is
It has a fixing convex part which fits core sheets which adjoin in the lamination direction on one side of the lamination direction of the scrap part,
The core sheet according to claim 1 or 2, further comprising a fixing recess for fitting the core sheets adjacent in the stacking direction on the other surface of the scrap portion in the stacking direction. The grip portion of the scrap portion used to grip and fix the core sheet laminated body in which the core sheets are laminated , has a tapered shape which is tapered toward the radial outer side. The core sheet according to any one of 3. The core sheet according to any one of claims 1 to 4, wherein both end surfaces in the circumferential direction of the scrap portion have notches cut in the circumferential direction. A divided laminated core in which a plurality of core portions according to any one of claims 1 to 5 are laminated. The split laminated core according to claim 6, wherein the coil winding portion of the laminate tooth portion of the split laminated core is molded with an insulator. A stator comprising a coil in which the plurality of divided laminated cores according to claim 6 or 7 are combined in a ring shape and wound around the laminated teeth portion of each of the divided laminated cores. A T-shaped core portion comprising: a split back yoke portion; and a teeth portion protruding from a central portion of the split back yoke portion;
Core sheet punching step of punching out from a magnetic material a core sheet comprising a scrap portion fitted at the radially outer center opposite to the side on which the teeth portion of the divided back yoke portion is protrusively provided. ,
The divided back yoke portion is provided with a fitting recess which is recessed in a step-like manner so that the circumferential width is narrowed inward in the radial direction at the central portion of the outer peripheral surface.
The scrap portion is provided with a step-like fitting projection which protrudes inward in the radial direction, which is fitted to the fitting recess,
After forming the fitting recess at the same time as punching out the fitting protrusion, the fitting projection for pressing the fitting protrusion back to the fitting recess to fit and fix the fitting protrusion and the fitting recess Core sheet punching process having a forming process;
A core sheet laminating step of laminating a plurality of the core sheets;
A scrap portion fixing step of temporarily bonding the scrap portions axially adjacent to each other;
An inter-stack fixing step of fully binding the core portions axially adjacent to each other;
A laminated scrap part which is pulled out radially outward from the laminated scrap part which is the part in which the scrap part is laminated after the inter-lamination fixing step, and is separated and separated from the divided laminated core which is the part in which the core part is laminated. A method of manufacturing a split laminated core comprising a separation step. The method according to claim 9, wherein the inter-stack adhering step is a molding step in which an insulator is integrally formed on the split laminated core. The laminated scrap portion separation step is performed by holding a laminated gripping convex portion which is connected to a laminated fitting convex portion which is a portion where the fitting convex portion of the laminated scrap portion is laminated and which protrudes outward in the radial direction. The manufacturing method of the division | segmentation laminated core of Claim 9 or Claim 10.

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