CN109075628B

CN109075628B - Laminated core and method for manufacturing same

Info

Publication number: CN109075628B
Application number: CN201780022103.XA
Authority: CN
Inventors: 田中崇裕; 中上匠; 鬼桥隆之; 别所智宏
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2016-04-08
Filing date: 2017-03-30
Publication date: 2021-08-06
Anticipated expiration: 2037-03-30
Also published as: CN109075628A; JPWO2017175664A1; WO2017175664A1; JP6602467B2

Abstract

A laminated core is formed in a ring shape by connecting a plurality of laminated cores (20) in which plate-shaped core pieces (13) having the same shape are laminated and fixed, wherein a core convex portion (21a) is provided at a 1 st end portion (21) of the laminated core (20), a core concave portion (22a) is provided at a 2 nd end portion (22), the core concave portion (22a) of the 2 nd end portion (22) of the laminated core (20) has a notch (22h) at a part of the outer peripheral side, the core concave portion (22a) has a deformable structure so as to form a hole portion (22p) surrounding the core convex portion (21a) of the 1 st end portion (21), and the laminated cores (20) are connected to each other by the hole portion (22p) of the laminated core (20) and the core convex portion (21a) of the laminated core (20).

Description

Laminated core and method for manufacturing same

Technical Field

The present invention relates to a core structure of a motor, a converter, or the like, and more particularly, to a laminated core in which a plurality of laminated cores each having a plate-like core segment laminated thereon are annularly connected, and a method for manufacturing the laminated core.

Background

Conventionally, as a stator of a motor, a laminated core in which punched sheet-shaped core pieces are laminated is used as a core device. There is disclosed a core device obtained by temporarily forming a laminated core including core pieces in which teeth are linearly connected to each other via a thin portion by a mold, integrally winding the laminated core, and annularly bending end portions of the laminated core (see, for example, patent document 1).

Further, there is disclosed a core device obtained by positioning a convex portion formed at an end portion of a laminated core and a concave portion formed at an opposite end portion and inserting the same in a laminating direction (see, for example, patent document 2).

Patent document 1: japanese patent laid-open publication No. H10-178749 (paragraphs [0022] to [0024] and FIGS. 1 and 3)

Patent document 2: japanese patent laid-open publication No. H10-271770 (paragraphs [0012] to [0014] and FIG. 1)

Disclosure of Invention

However, in the invention disclosed in patent document 1, the productivity of the laminated core is high, and winding and transportation are easy, but large investment is required due to the large size of the die and the press apparatus, and it is difficult to apply the invention to a machine type having a small number of production stages. In the invention disclosed in patent document 2, since the laminated core is inserted in the laminating direction by aligning the convex portions and the concave portions, there is a possibility that the core is engaged during insertion and cannot be inserted into the end portion.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a laminated core and a method of manufacturing the same, in which the laminated cores can be easily connected and a mold can be reduced in size.

The present invention relates to a laminated core in which a plurality of laminated cores, each having a plate-shaped core piece of the same shape laminated and fixed thereon, are connected to form a ring shape, wherein the laminated core has a structure in which a convex portion is provided at one end of the laminated core, a concave portion is provided at the other end of the laminated core, a notch is provided at a part of the outer peripheral side of the concave portion, and the concave portion has a structure deformable into a C-shape so as to form a hole portion surrounding the convex portion.

A method for manufacturing a laminated core according to the present invention is a method for manufacturing a laminated core in which a plurality of laminated cores are connected to form a ring shape, the laminated core having a convex portion at one end portion of the laminated core, a concave portion at the other end portion of the laminated core, and a notch at a portion on an outer peripheral side of the concave portion, the concave portion being deformable into a C-shape to form a hole portion surrounding the convex portion, the method including: an alignment step of inserting the convex portion of the 1 st laminated core into the concave portion of the 2 nd laminated core; a temporary connection step of deforming the recessed portions into a U shape to form hole portions surrounding the raised portions of the 1 st laminated core, thereby preventing the laminated cores from falling off from each other; a winding step of winding a tooth portion of the laminated core; and a primary connecting step of deforming the recessed portions from a U shape to a C shape to fix the laminated cores in an annular shape.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the laminated core of the present invention, the recess has the notch at a portion on the outer peripheral side thereof, and the recess is deformable into the C-shape so as to form the hole surrounding the convex portion, so that the laminated core can be easily connected, and the mold can be made smaller.

The method for manufacturing a laminated core according to the present invention includes: a temporary connection step of deforming the 1 st recessed portion into a U shape to form a hole portion surrounding the raised portion of the 1 st laminated core, thereby preventing the laminated cores from falling off from each other; and a primary connecting step of deforming the recess from the U-shape to the C-shape to fix the laminated cores in a ring shape, so that the laminated cores can be easily connected to each other, and the mold can be made compact.

Drawings

Fig. 1 is a sectional view of a structure of a laminated core of a motor according to embodiment 1 of the present invention.

Fig. 2 is a perspective view and a plan view showing a state before the connection of the laminated core according to embodiment 1 of the present invention.

Fig. 3 is a main enlarged view of a plan view showing a state before the connection of the laminated cores according to the laminated core of embodiment 1 of the present invention.

Fig. 4 is a perspective view and a plan view illustrating a positioning process of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 5 is a perspective view and a plan view illustrating a temporary joining process of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 6 is a main enlarged view of a plan view showing a temporary joining step of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 7 is a perspective view and a plan view illustrating a temporary joining process of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 8 is a partial enlarged plan view of a temporary connection step of the laminated core according to embodiment 1 of the present invention.

Fig. 9 is a perspective view and a plan view showing a primary joining process of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 10 is a partial enlarged plan view showing a primary connecting step of the laminated core according to embodiment 1 of the present invention.

Fig. 11 is an explanatory view of a winding process of a laminated core according to a comparative example of the laminated core according to embodiment 1 of the present invention.

Fig. 12 is an explanatory view of a chamfering process of a laminated core according to a comparative example of the laminated core according to embodiment 1 of the present invention.

Fig. 13 is an explanatory view of a winding process of the laminated core according to embodiment 1 of the present invention.

Fig. 14 is an explanatory view of a temporary connection process of the laminated core according to embodiment 1 of the present invention.

Fig. 15 is an explanatory view of a temporary connection process of the laminated core according to embodiment 1 of the present invention.

Fig. 16 is an explanatory view of a manufacturing process of a laminated core according to the laminated core according to embodiment 1 of the present invention.

Fig. 17 is an explanatory view of a winding process of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 18 is an explanatory view of a winding process of the laminated core according to embodiment 1 of the present invention.

Fig. 19 is an explanatory view of a main connecting step of the laminated core according to the laminated core of embodiment 1 of the present invention.

Fig. 20 is an explanatory view of a primary connecting step of the laminated core according to embodiment 1 of the present invention.

Fig. 21 is a flowchart according to a method for manufacturing a laminated core according to embodiment 1 of the present invention.

Fig. 22 is a plan view and an enlarged view of essential parts of a laminated core according to embodiment 2 of the present invention before the laminated core is connected.

Fig. 23 is a plan view and an enlarged main part view showing a positioning step of the laminated core according to embodiment 2 of the present invention.

Fig. 24 is a plan view and an enlarged view of essential parts illustrating a temporary joining process of the laminated core according to embodiment 2 of the present invention.

Fig. 25 is a plan view and an enlarged essential part view showing a primary joining step of the laminated core according to embodiment 2 of the present invention.

Fig. 26 is a plan view and an enlarged main part view showing a state before the connection of the laminated cores according to the laminated core of embodiment 3 of the present invention.

Fig. 27 is a plan view and an enlarged main part view showing a positioning step of the laminated core according to embodiment 3 of the present invention.

Fig. 28 is a plan view and an enlarged essential part view showing a primary joining step of the laminated core according to embodiment 3 of the present invention.

Fig. 29 is a plan view and an enlarged essential part view showing a chamfering step of the laminated core according to embodiment 3 of the present invention.

Detailed Description

Embodiment 1.

Embodiment 1 relates to a laminated core having the following structure and a method for manufacturing a laminated core having an alignment step, a temporary connection step, a winding step, and a main connection step, the laminated core has a core convex portion at a 1 st end portion of the laminated core, a core concave portion at a 2 nd end portion of the laminated core, a jaw-shaped projection and a slide guide projection, the jaw-shaped projection being configured to be deformable in 2 stages so as to form a hole portion surrounding the core convex portion at the 1 st end portion together with the slide guide projection, the laminated cores being prevented from falling off by sliding the laminated cores with each other in the 1 st-stage deformation (hereinafter, referred to as 1 st deformation), and the laminated cores being connected with each other to form an annular laminated core in the 2 nd-stage deformation (hereinafter, referred to as 2 nd deformation).

Next, a structure of a laminated core according to embodiment 1 and a method for manufacturing the same will be described with reference to fig. 1 to 21, where fig. 1 is a sectional view showing a structure of a laminated core of an electric motor, fig. 2 is an oblique view and a plan view showing a state before connection, fig. 3 is an enlarged view of an essential part of fig. 2, fig. 4 is an oblique view and a plan view showing an alignment step, fig. 5 and 7 are an oblique view and a plan view showing a temporary connection step, fig. 6 and 8 are enlarged views of essential parts of fig. 5 and 7, fig. 9 is an oblique view and a plan view showing a main connection step, fig. 10 is an enlarged view of an essential part of fig. 9, fig. 11 is an explanatory view of a winding step of a laminated core according to a comparative example, fig. 12 is an explanatory view of a chamfering step of a laminated core according to embodiment 1, fig. 14 and 13 are explanatory views of a winding step of a laminated core according to embodiment 1, and fig. 14 and 21 are illustrated in detail, Fig. 15 is an explanatory view of a temporary connection step, fig. 16 to 18 are explanatory views of a winding step, fig. 19 and 20 are explanatory views of a main connection step, and fig. 21 is a flowchart relating to a method of manufacturing a laminated core.

First, as an example of a device to which the laminated core according to embodiment 1 is applied, a structure of a laminated core of an electric motor will be described with reference to fig. 1, and a basic structure of the laminated core will be described with reference to fig. 2. Fig. 2(a) is a perspective view of the laminated core, and fig. 2(b) is a plan view of the laminated core.

Fig. 1 is a sectional view showing a structure of a laminated core of a motor. The laminated core 1 is configured by annularly connecting a plurality of laminated cores 10, and the winding 2 is wound around the laminated cores 10. The laminated cores 10 are coupled to each other by fitting the core convex portions 11a and the core concave portions 12 a.

In fig. 2(a) and (b), the laminated core 10 is obtained by laminating and fixing plate-shaped core segments 13 made of a magnetic material in the axial direction. The laminated core 10 is composed of a back yoke portion 14 and a tooth portion 15. The laminated core 10 has a 1 st end portion 11 and a 2 nd end portion 12. A core convex portion 11a as a coupling means is formed at the 1 st end portion 11, and a core concave portion 12a for coupling with the core convex portion 11a is formed at the 2 nd end portion 12. As means for stacking and fixing, adhesion, welding, caulking by tenon, or a combination thereof is used.

Next, the connection sequence (alignment, temporary connection, and final connection process) of the laminated core 10, the winding process, and the temporary connection and final connection process using a jig will be described. In the description of the winding step, in order to clarify the characteristics of the laminated core according to embodiment 1 and the method for manufacturing the same, the winding step of the laminated core according to the comparative example is also described.

First, a state before the connection of the laminated core 10 and the aligning step will be described with reference to fig. 2 to 4. Fig. 4(a) is a perspective view showing the alignment step, and fig. 4(b) is a plan view.

In the laminated cores 10 adjacent to each other shown in fig. 2(a) and 2(b), the core convex portions 11a and the core concave portions 12a are brought close to each other, and the positions of the inner locking step 11e and the inner locking convex portion 12e in fig. 3 are aligned, so that the states shown in fig. 4(a) and (b) are obtained. At this time, as shown in fig. 3, the core recess 12a surrounded by the jaw-shaped protrusion 12b and the slide guide protrusion 12d has an opening width larger than the width of the core protrusion 11a, and therefore, the positioning can be performed smoothly.

In fig. 3, the 1 st end portion 11 further includes an outer slide escape groove 11b, an outer locking step 11c, an inner slide escape groove 11d, a convex portion side end surface 11f, a springback prevention protrusion 11g, and a core chamfer locking recess 11 h. The 2 nd end portion 12 further includes an outer locking protrusion 12c, a recess-side end surface 12f, a thin portion 12g, and a deformation escape groove 12 h. The functions and actions of these will be described in turn later.

Next, a temporary connection process of the laminated core 10 will be described with reference to fig. 5 to 8. Fig. 5(a) and 7(a) are oblique views showing the temporary connection step, and fig. 5(b) and 7(b) are plan views.

The laminated core 10 is in the state shown in fig. 5(a) and (b) by applying force to the jaw-shaped protrusion 12b to perform the 1 st deformation. By the 1 st deformation of the jaw-shaped protrusion 12b, the opening width of the core recess 12a becomes smaller than the width of the core protrusion 11a, and the laminated cores 10 can be handled as one body. That is, the core recess 12a has a U-shape.

Fig. 6 is an enlarged view of a main portion of the jaw-shaped protrusion 12 b. The hole portion 12p is formed by the jaw-shaped protrusion 12b and the slide guide protrusion 12 d. Since the width of the outer locking projection 12c at the tip of the jaw-shaped projection 12b and the width of the inner locking projection 12e at the tip of the slide guide projection 12d are narrower than the width of the core projection 11a, the laminated cores 10 do not fall off from each other.

Here, since the jaw-shaped protrusion 12b is connected to the plate-shaped core piece 13 via the thin portion 12g and the deformation escape groove 12h, the force required for deformation of the jaw-shaped protrusion 12b can be reduced. The deformation escape grooves 12h suppress out-of-plane deformation and springback, thereby improving shape accuracy.

Then, the laminated cores 10 are slid in the direction of approaching each other, whereby the laminated cores 10 are brought into the states shown in fig. 7(a) and (b). Fig. 8 is an enlarged view of a main portion of the jaw-shaped protrusion 12 b. The outer locking protrusion 12c and the outer locking step 11c, and the inner locking protrusion 12e and the inner locking step 11e are engaged, thereby preventing the laminated cores 10 from being separated from each other. Further, by providing the outer slide retreat groove 11b and the inner slide retreat groove 11d, the laminated cores 10 can be slid in a direction to approach each other.

Next, a primary connecting process of the laminated core 10 will be described with reference to fig. 9 and 10. Fig. 9(a) is a perspective view showing the main joining step, and fig. 9(b) is a plan view.

The laminated core 10 is deformed into an annular shape. Then, by applying a force to the jaw-shaped protrusion 12b and further deforming the jaw-shaped protrusion 12b toward the inner diameter side of the laminated core 10 by temporary connection (2 nd deformation), the laminated core 10 is in the state of fig. 9(a) (b). That is, the core recess 12a is C-shaped.

Fig. 10 is an enlarged view of a main portion of the jaw-shaped protrusion 12 b.

Accordingly, the laminated cores 10 are rotated, and the recess-side end surfaces 12f of the laminated cores 10 on one side are butted against the projection-side end surfaces 11f of the laminated cores 10 to be connected, thereby arranging the laminated cores 10 in an annular shape.

After winding the wire described later, the plurality of laminated cores 10 are permanently connected to each other, thereby forming the laminated core 1 shown in fig. 1.

In fig. 10, the jaw-shaped protrusion 12b after the 2 nd deformation is limited inside the outer slide escape groove 11b by the rebound prevention protrusion 11 g. The deformation of the jaw-shaped protrusion 12b may be applied by a jig or the like from the outside, or may be applied by pressing the jaw-shaped protrusion 12b with the rebound preventing protrusion 11g by a force of the rotation of the laminated core 10. Since the inner slide retraction groove 11d has a polygonal shape, the slide guide projection 12d is limited to the inside of the inner slide retraction groove 11d even when the laminated core 10 is rotated. The laminated core 10 formed in an annular shape is locked by engaging the inside locking protrusion 12e provided at the tip of the slide guide protrusion 12d with the core chamfered locking recess 11h provided at the root of the core protrusion 11 a.

In fig. 10, after the core recess 12a is deformed into the C-shape, a space (a relief margin) remains in the deformation relief groove 12 h. This realizes the function of the escape groove.

Here, the correspondence relationship with the description of the claims will be described.

The protruding portions in the claims are core protruding portions 11a, the recessed portions are core recessed portions 12a, outer peripheral sides of the recessed portions are jaw projections 12b, the notches are deformation relief grooves 12h, and the hole portions are hole portions 12 p.

The thin portion in the claims is a thin portion 12 g.

The convex portion of the claimed convex portion extending in the radial direction on the outer peripheral side is a rebound preventing projection 11 g.

In the claims, the protrusion provided at the inner diameter side distal end portion of the recess is an inner side locking protrusion 12e, and the inner diameter side valley portion of the base portion of the protrusion having a shape matching the protrusion provided at the inner diameter side distal end portion of the recess is a core chamfer locking recess 11 h.

Next, a winding process performed after the temporary connection process described above will be described with reference to fig. 11 to 13.

As described in the temporary connection step of fig. 5, the laminated core and the method for manufacturing the laminated core according to embodiment 1 can slide the teeth 15 of the laminated core 10 in the direction of separating from each other. With this feature, the winding space between the teeth 15 of the laminated core 10 can be enlarged, and more windings can be wound.

In order to clarify the characteristics of the laminated core and the method for manufacturing the same according to embodiment 1, a winding step and a chamfering step of the laminated core according to the comparative example will be described with reference to fig. 11 and 12.

Fig. 11(a) and (b) show a winding process of the laminated core 110 of the comparative example. Here, fig. 11(b) is an enlarged view of the 2 laminated cores 110 on the right end of fig. 11 (a).

The laminated core 110 of the comparative example is connected via the slit portion 110a and the thin portion 110 b. The laminated core 110 is composed of a back yoke portion 114 and tooth portions 115.

The laminated core 110 is fixed by a core chuck 51 of a winding machine. After winding the winding 2 using the winding machine nozzle 50, the thin portion 110b is plastically deformed and arranged in an annular shape, and the laminated core 110 is fixed by the core end portion joint 110c, thereby forming the annular core apparatus 101 of the comparative example shown in fig. 12. For the core end joint 110c, welding, adhesion, or the like is used.

Here, the problem of the laminated core 110 of the comparative example will be described. In fig. 11(b), after the winding 2 is wound around the right tooth 115, when the winding 2 is wound around the left tooth 115, the winding machine nozzle 50 interferes with the winding 2. If the laminated inter-core distance a is increased, the outer diameter of the core device 101 of the comparative example is also increased, and as a result, the motor becomes larger. In the case where the outer diameter of the core device 101 of the comparative example is not changed, the number of coils to be wound needs to be reduced, and as a result, the efficiency of the motor is lowered.

In contrast, fig. 13(a) and (b) show a winding process of the laminated core and the method for manufacturing the same according to embodiment 1. Fig. 13(a) shows a state in which the winding space between the teeth 15 of the laminated core 10 is enlarged and the winding is wound. Fig. 13(b) shows a state in which the winding is completed and the winding space between the teeth 15 of the laminated core 10 is narrowed. In addition, a winding machine core chuck 52 was used for the laminated core 10 of embodiment 1, as opposed to the winding machine core chuck 51 for the laminated core 110 of the comparative example.

After the laminated core 10 is fixed by the winding machine core chuck 52, the laminated cores are slid in the direction of separating each other to provide the laminated core distance B (B > a), whereby the winding 2 and the winding machine nozzle 50 do not interfere with each other. Therefore, more windings can be wound than the laminated core 110 of the comparative example, and as a result, the efficiency of the motor can be improved.

After winding, as shown in fig. 13(B), the laminated cores 10 are slid in a direction to approach each other to reduce the laminated inter-core distance B to the laminated inter-core distance a, thereby obtaining the same laminated inter-core distance a as the laminated core 110 of the comparative example, and the laminated core 1 of fig. 1 is formed by the primary joining step. The laminated core 1 according to embodiment 1 can wind a larger number of coils with the same outer diameter as the core device 101 according to the comparative example.

Therefore, the laminated core and the method for manufacturing the same according to embodiment 1 can facilitate the winding operation and improve the area factor.

Next, an application of the jig in the temporary connection step will be described with reference to fig. 14 and 15.

First, a case of using 1 temporary fastening jig punch will be described with reference to fig. 14.

Fig. 14(a) shows a method of arranging a pair of laminated cores 10 to be joined to a temporary joining jig 60. Fig. 14(b) shows a state after the laminated core 10 is aligned. Fig. 14(c) shows a state in which the 1 st deformation of the jaw-shaped protrusion 12b is performed and the temporary connection is completed.

The temporary connection jig 60 includes a temporary connection jig base 61 for positioning the laminated core 10, and a temporary connection jig punch 63 for pressing and deforming the jaw-shaped protrusion 12 b.

A core positioning boss 62 is formed on the temporary connection jig base 61, and the protruding portion side end face 11f and the recessed portion side end face 12f of the laminated core 10 are aligned with the core positioning boss 62 and positioned (the state of fig. 14 (b)). Then, the temporary joining jig punch 63 applies a force to the jaw-shaped protrusion 12b to perform the 1 st deformation, thereby completing the temporary joining (the state of fig. 14 (c)).

Further, the front end portion of the convex side end surface 11f has a right angle or an inclination. The recess-side end surface 12f has a right angle or an inclination on the inner diameter side of the base.

Here, in the convex portion of the claims, the projection provided on the inner diameter side of the base portion is a convex portion side end surface 11f, and the projection constituting the inner diameter side of the concave portion is a concave portion side end surface 12 f.

Next, a case of using the temporary joint jig is described with reference to fig. 15. Fig. 15(a) shows a state in which the plurality of laminated cores 10 are aligned and set in a jig. Fig. 15(b) shows a state where the 1 st deformation of the jaw-shaped protrusion 12b is intensively performed and the temporary connection is completed. Here, the temporarily connected laminated cores 10 are temporarily connected laminated cores 16.

The temporary connection jig 60 shown in fig. 14 is a jig for temporarily connecting 1 part by 1 part, and the collective temporary connection jig 64 shown in fig. 15 can temporarily connect a plurality of connection parts collectively at the same time.

In the unified temporary connection jig base 65, a plurality of laminated cores 10 are arranged (fig. 15 (a)), and the unified temporary connection jig punch 66 simultaneously performs the 1 st deformation on the plurality of jaw-shaped projections 12b, thereby forming the temporarily connected laminated cores 16 (fig. 15 (b)). As a result, the time for temporarily connecting the laminated cores 10 can be shortened.

Next, a winding process for uniformly winding the windings 2 around the plurality of laminated cores 10 will be described with reference to fig. 16 to 18. Here, the wound laminated core 10 is referred to as a wound laminated core 17.

The winding process in fig. 13 is illustrated by an example in which 1 nozzle 50 of the winding machine is used, but the temporarily connected laminated cores 16 may be wound in a lump as illustrated in fig. 16 to 18. The winding machine main body (not shown) includes a plurality of winding machine core chucks 52, a winding machine core chuck base 54 for slidably fixing the winding machine core chucks 52, a plurality of winding machine nozzles 50, and a winding machine nozzle holder 53 for fixing the winding machine nozzles 50. First, as shown in fig. 16, the laminated core 16 temporarily connected is mounted on the core chuck 52 of the winding machine. At this time, the temporarily connected laminated core 16 slides in a direction to shorten the distance between the teeth 15 of the laminated core 10, and the contact point of the connection portion is increased, whereby the rigidity of the entire core is improved, and the feeding and the mounting to the core chuck 52 of the winding machine are facilitated. Then, as shown in fig. 17, after sliding the winding machine core chuck 52 in a direction to enlarge the distance between the teeth 15 of the laminated core 10, the windings 2 are wound around all the teeth 15 of the temporarily coupled laminated core 16 at the same time using a plurality of winding machine nozzles 50 attached to a winding machine nozzle holder 53. After the winding is completed, as shown in fig. 18, after the winding machine nozzle 50 is retracted, the winding machine core chuck 52 is slid in a direction to shorten the distance between the teeth 15 of the laminated core 10, and the wound laminated core 17 is removed from the winding machine core chuck 52.

Next, an application of the jig in the primary joining step of forming the annular laminated core 1 by primary joining at the joining portion of the wound laminated core 17 will be described with reference to fig. 19 and 20.

First, a case where the primary connection is performed by applying the primary connection pressing claw 70 will be described with reference to fig. 19.

As shown in fig. 19(a), the wound laminated core 17 is chamfered into a circular ring shape, and the jaw-shaped projections 12b that are separated from the outer diameter of the wound laminated core 17 are deformed 2 nd by applying a force from the outer circumferential side by the final-connection pressing claws 70, thereby performing final connection, and the laminated core 1 is formed as shown in fig. 19 (b).

In fig. 19, 3 main coupling pressing claws 70 are provided, but 2 main coupling pressing claws may be provided, or 4 main coupling pressing claws may be provided.

Next, a case where the primary connection is performed by applying the primary connection mandrel 71 and the primary connection pressing roller 72 will be described with reference to fig. 20. Here, fig. 20(a) shows the structure of the jig, and fig. 20(b) and (c) are explanatory views of the main connection.

The primary connection jig is composed of a primary connection mandrel 71 for positioning the inner diameter of the wound laminated core 17, and a primary connection pressing roller 72 for applying force to the jaw-shaped protrusion 12b to deform the same.

In fig. 20(b), the wound laminated core 17 is wound with respect to the primary connecting plug 71. At this time, the laminated core 10 can also be fixed by generating a magnetic attraction force using an electromagnet or a permanent magnet on the main connecting mandrel 71. Then, the positive connection pressing roller 72 applies a force to press the wound laminated core 17 against the positive connection mandrel 71, and the jaw-shaped protrusion 12b that is removed from the outer diameter of the wound laminated core 17 is deformed by the 2 nd deformation to perform the positive connection. The primary connection mandrel bar 71 and the wound laminated core 17 are rotated in the direction of the arrow in fig. 20(c), whereby the primary connection can be continuously performed by the primary connection pressing roller 72. Therefore, the main connection can be performed in a short time.

Next, the method for manufacturing the laminated core according to embodiment 1 described above will be described based on the flowchart of fig. 21.

The method for manufacturing a laminated core according to embodiment 1 uses a method for manufacturing a laminated core 10, in which the laminated core 10 includes a core convex portion 11a at a 1 st end portion 11 of the laminated core 10, a core concave portion 12a at a 2 nd end portion 12 of the laminated core 10, the core concave portion 12a at the 2 nd end portion 12 of the laminated core 10 includes a jaw-shaped protrusion 12b and a slide guide protrusion 12d, and the jaw-shaped protrusion 12b is configured to be deformable in 2 stages so that a hole portion 12p surrounding the core convex portion 11a at the 1 st end portion 11 is formed by the jaw-shaped protrusion 12b and the slide guide protrusion 12 d. The 1 st modification is a modification for allowing the laminated cores 10 to slide with each other without causing the laminated cores 10 to fall off from each other, and the 2 nd modification is a modification for connecting the laminated cores 10 to each other. The method for manufacturing a laminated core according to embodiment 1 includes the following steps 1(S01) to 4 (S04).

In the positioning step of step 1(S01), the core convex portion 11a of the 1 st laminated core 10 is inserted into the core concave portion 12a of the 2 nd laminated core 10, and the 1 st laminated core 10 and the 2 nd laminated core 10 are positioned.

In the temporary connection step of step 2(S02), the 1 st deformation is performed on the jaw-shaped protrusion 12b of the laminated core 10 to reduce the opening width of the core recess 12 a. The hole portion 12p is formed by the jaw-shaped protrusion 12b and the slide guide protrusion 12 d. Thereby preventing the laminated cores 10 from falling off from each other.

In the winding step of step 3(S03), the laminated cores 10 are slid on each other, the windings 2 are wound around the teeth 15 of the laminated cores 10 with the intervals between the teeth 15 widened, and the laminated cores 10 are slid on each other after winding to narrow the intervals between the teeth 15.

In the primary connecting step of step 4(S04), the plurality of laminated cores 10 around which the winding 2 is wound are arranged in a ring shape, and the laminated cores 1 are connected and fixed by 2 nd deformation at the jaw-shaped projections 12b of the laminated cores 10.

As described above, embodiment 1 relates to a laminated core having a core convex portion at a 1 st end of the laminated core, a core concave portion at a 2 nd end of the laminated core, a jaw-shaped protrusion and a slide guide protrusion in the core concave portion at the 2 nd end of the laminated core, the jaw-shaped protrusion being deformable by 2 stages so as to form a hole portion surrounding the core convex portion at the 1 st end together with the slide guide protrusion, the 1 st deformation being capable of sliding the laminated cores with each other without the laminated cores falling off from each other, and the 2 nd deformation being capable of connecting the laminated cores with each other to form an annular laminated core, and a method for manufacturing the laminated core having an alignment step, a temporary connection step, a winding step, and a main connection step.

Therefore, the laminated cores and the method for manufacturing the same according to embodiment 1 can be easily connected, and the mold can be reduced in size. And the winding operation can be facilitated to improve the wire volume rate.

Embodiment 2.

The laminated core according to embodiment 2 is simplified in structure and manufacturing method thereof by eliminating the structure in which the laminated cores slide with each other when temporarily connected to the laminated core according to embodiment 1.

Next, a laminated core according to embodiment 2 and a method for manufacturing the laminated core will be described with reference to fig. 22 to 25, in which fig. 22 is a plan view and an enlarged main portion view showing a state before the laminated core is connected, fig. 23 is a plan view and an enlarged main portion view showing an alignment step, fig. 24 is a plan view and an enlarged main portion view showing a temporary connection step, and fig. 25 is a plan view and an enlarged main portion view showing a main connection step.

The connection sequence (alignment, temporary connection, and main connection steps) of the laminated core 20 will be described in order.

First, a state before the connection of the laminated cores 20 and the alignment step will be described with reference to fig. 22 and 23. Fig. 22(a) is a plan view of the laminated core 20, and fig. 22(b) is an enlarged view of an essential part. Fig. 23(a) is a plan view showing the alignment step, and fig. 23(b) is an enlarged view of an essential part.

In fig. 22(a), the laminated core 20 is obtained by laminating and fixing plate-shaped core pieces made of a magnetic material in the axial direction. The laminated core 20 includes a back yoke portion 24 and a tooth portion 25. The laminated core 20 has a 1 st end 21 and a 2 nd end 22. A core convex portion 21a as a coupling means is formed at the 1 st end portion 21, and a core concave portion 22a for coupling with the core convex portion 21a is formed at the 2 nd end portion 22. As means for stacking and fixing, adhesion, welding, caulking by tenon, or a combination thereof is used.

In fig. 22(b), the 1 st end 21 of the laminated core 20 has an outer slide relief groove 21b and an inner slide relief groove 21d on both sides of the core convex portion 21 a. The core protrusion 21a has a coupling and locking protrusion 21j in a part thereof. Further, the laminated core 20 has a projection side end surface 21f on the inner diameter side for positioning the laminated core in an annular shape.

On the other hand, the 2 nd end portion 22 of the laminated core 20 includes a core recess 22a, and the jaw-shaped protrusion 22b and the slide guide protrusion 22d are provided on both sides of the core recess 22 a. The base of the jaw-shaped projection 22b has a thin portion 22g and a deformation escape groove 22 h. The jaw-shaped protrusion 22b has an outer locking protrusion 22c at its distal end, a primary fastening groove 22j for fitting in the primary fastening step and a temporary fastening protrusion 22k for positioning the fastening locking protrusion 21j in the temporary fastening step on the inner diameter side. Further, the slide guide boss 22d has a recess-side end surface 22f on the inner diameter side thereof for positioning with the projection-side end surface 21 f.

The adjacent laminated cores 20 are brought close to each other so that the core convex portions 21a and the core concave portions 22a are aligned, and the state shown in fig. 23(a) and (b) is obtained. At this time, the opening width of the core recess 22a surrounded by the jaw-shaped protrusion 22b and the slide guide protrusion 22d is larger than the width of the core protrusion 21a, so that the positioning can be performed smoothly.

Next, a temporary connection process of the laminated core 20 will be described with reference to fig. 24. Fig. 24(a) is a plan view showing a temporary connection step, and fig. 24(b) is an enlarged view of an essential part. Here, the temporarily connected laminated core 20 is set as a temporarily connected laminated core 26.

The laminated core 20 is in the state shown in fig. 24(a) by applying force to the jaw-shaped protrusion 22b to perform the 1 st deformation. The hole portion 22p is formed by the jaw-shaped protrusion 22b and the slide guide protrusion 22 d. The core convex portion 21a is sandwiched and fixed by the slide guide protrusion 22d, the temporary connection locking protrusion 22k, and the core concave portion 22a by the deformation of the jaw-shaped protrusion 22 b.

The outer slide retraction groove 21b and the outer locking protrusion 22c contact each other, thereby also suppressing the laminated cores 20 from rotating relative to each other. Thus, the laminated core 26 after the temporary connection of the laminated cores 20 can be easily subjected to the conveying and winding operations as a single body, as in the case of the laminated core 110 of the comparative example.

Here, the jaw-shaped protrusion 22b is connected to the plate-shaped core piece via the thin portion 22g and the deformation escape groove 22h, and the force required for the deformation of the jaw-shaped protrusion 22b can be reduced. The deformation escape grooves 22h suppress out-of-plane deformation and springback, thereby improving shape accuracy.

Next, a primary connecting process of the laminated core 20 will be described with reference to fig. 25. Fig. 25(a) is a plan view showing the main joining step, and fig. 25(b) is an enlarged view of an essential part.

The laminated core 20 is deformed into an annular shape. Then, a force is applied to the jaw-shaped protrusion 22b, and the jaw-shaped protrusion 22b is further deformed toward the inner diameter side of the laminated core 20 by the temporary connection (2 nd deformation), whereby the laminated core 20 is in the state of fig. 25 a.

Specifically, the laminated cores 20 are arranged in an annular shape by rotating the laminated core 20 and abutting the recess-side end surface 22f of the 2 nd end portion 22 of the laminated core 20 with the projection-side end surface 21f of the 1 st end portion 21 of the laminated core 20. Then, a force is applied to the jaw-shaped protrusion 22b, and the jaw-shaped protrusion 22b is deformed further toward the inner diameter side of the laminated core 20 by temporary connection, thereby fixing the laminated core 20 in an annular shape.

As shown in fig. 25(b), the primary interlocking grooves 22j on the inner diameter side of the jaw-shaped protrusion 22b are fitted into the interlocking protrusions 21j, and the root portions of the core protrusions 21a are sandwiched between the outer interlocking protrusions 22c and the slide guide protrusions 22d, thereby fixing the laminated cores 20 to each other. At this time, the slide guide projection 22d is defined inside the inner slide escape groove 21 d.

In the claims, the protrusion on the inner diameter base side of the protrusion constituting the outer diameter side of the concave portion is a temporary connection locking protrusion 22k, the valley portion on the inner diameter tip side of the protrusion constituting the outer diameter side of the concave portion is a final connection locking groove 22j, and the protrusion on the outer diameter side of the base portion of the convex portion is a connection locking protrusion 21 j.

The winding operation is the same as that described for the comparative laminated core 110 in embodiment 1, and therefore, the operation is omitted.

Since the laminated core according to embodiment 2 is divided for each laminated core, the laminated core can be manufactured with a small mold, and the mold cost can be reduced. On the other hand, since the same equipment as that for the laminated core 110 of the comparative example can be used in the winding step, the equipment investment cost can be suppressed to be low.

Next, the method for manufacturing the laminated core according to embodiment 2 described above will be described. Since the flowchart is the same as that of fig. 21 of embodiment 1, the description will be made with reference to fig. 21.

For the sake of distinction from embodiment 1, the step number is described as a 1-headed number.

The method of manufacturing a laminated core according to embodiment 2 is a manufacturing method using a laminated core 20, in which the laminated core 20 has a core convex portion 21a at a 1 st end portion 21 of the laminated core 20, a core concave portion 22a at a 2 nd end portion 22 of the laminated core 20, the core concave portion 22a at the 2 nd end portion 22 of the laminated core 20 has a jaw-shaped protrusion 22b and a slide guide protrusion 22d, and the jaw-shaped protrusion 22b is configured to be deformable in 2 stages so that a hole portion surrounding the core convex portion 21a at the 1 st end portion 21 is formed by the jaw-shaped protrusion 22b and the slide guide protrusion 22 d. The method for manufacturing a laminated core according to embodiment 2 includes the following steps 11(S11) to 14 (S14).

In the positioning step of step 11(S11), the core convex portion 21a of the 1 st laminated core 20 is inserted into the core concave portion 22a of the 2 nd laminated core 20, and the 1 st laminated core 20 and the 2 nd laminated core 20 are positioned.

In the temporary connection step of step 12(S12), the 1 st deformation is performed on the jaw-shaped protrusion 22b of the laminated core 20 to reduce the opening width of the core recess 22 a. The hole portion 22p is formed by the jaw-shaped protrusion 22b and the slide guide protrusion 22 d. Thereby preventing the laminated cores 20 from falling off from each other.

In the winding step of step 13(S13), the windings 2 are wound around the teeth 25 of the laminated core 20.

In the primary connecting step of step 14(S14), the plurality of laminated cores 20 with the wound wire are arranged in a ring shape, and the 2 nd deformation is performed on the jaw-shaped projections 22b of the laminated cores 20 to be connected and fixed, thereby forming a laminated core.

In addition, a unified temporary connection jig (a unified temporary connection jig base, a unified temporary connection jig punch) in the temporary connection step described in embodiment 1 may be used for the laminated core 20 of embodiment 2. Further, the primary joining jig (the primary joining pressing claw, or the primary joining mandrel bar and the primary joining pressing roll) in the primary joining step described in embodiment 1 may be used.

As described above, the laminated core according to embodiment 2 is simplified by eliminating the structure in which the laminated cores slide each other at the time of temporary connection, compared to the divided laminated core according to embodiment 1. Therefore, the laminated core and the method for manufacturing the same according to embodiment 2 can easily connect the laminated cores, can reduce the size of the mold, and can reduce the equipment investment cost.

Embodiment 3.

Embodiment 3 simplifies the structure of the laminated core and the manufacturing method thereof by only 1 step of deformation of the jaw-shaped protrusion, compared with the laminated core of embodiment 2.

Next, a laminated core according to embodiment 3 and a method for manufacturing the laminated core will be described with reference to fig. 26 to 29, which mainly differ from embodiments 1 and 2, wherein fig. 26 is a plan view and an enlarged main portion view showing a state before the laminated core is connected, fig. 27 is a plan view and an enlarged main portion view showing an alignment step, fig. 28 is a plan view and an enlarged main portion view showing a connection step, and fig. 29 is a plan view and an enlarged main portion view showing a chamfering step.

In embodiments 1 and 2, the stacked cores are connected in 2 stages, and therefore, the temporary connection and the final connection are distinguished. In embodiment 3, the connection of the laminated core is performed in 1 stage, and the connection step is performed without distinction. The step of forming the laminated core by annularly connecting the laminated cores is a chamfering step.

The connection procedure (positioning and connection procedure) and chamfering procedure of the laminated core 30 will be described in order.

First, a state before the connection of the laminated core 30 and the aligning step will be described with reference to fig. 26 and 27. Fig. 26(a) is a plan view of the laminated core 30, and fig. 26(b) is an enlarged view of a main part thereof. Fig. 27(a) is a plan view showing the alignment step, and fig. 27(b) is an enlarged view of an essential part.

In fig. 26(a), the laminated core 30 is obtained by laminating and fixing plate-shaped core pieces made of a magnetic material in the axial direction. The laminated core 30 is composed of a back yoke portion 34 and a tooth portion 35. The laminated core 30 has a 1 st end 31 and a 2 nd end 32. A core convex portion 31a as a coupling means is formed at the 1 st end portion 31, and a core concave portion 32a for coupling with the core convex portion 31a is formed at the 2 nd end portion 32. As means for stacking and fixing, adhesion, welding, caulking by tenon, or a combination thereof is used.

In fig. 26(b), the 1 st end 31 of the laminated core 30 has an inner slide relief groove 31d on the inner diameter side of the core convex portion 31a and a convex portion side end face 31f for positioning the laminated core 30 in an annular shape. The core convex portion 31a has a jaw-shaped protrusion escape concave portion 31m that partially dents.

On the other hand, the laminated core 30 has a 2 nd end portion 32 having a jaw-shaped protrusion 32b and a slide guide protrusion 32d on both sides of a core recess 32 a. The base of the jaw-shaped projection 32b has a thin portion 32g and a deformation escape groove 32 h. Further, the jaw protrusion pressure applying portion 32m that fits into the jaw protrusion retreating recess 31m at the time of connection is provided on the inner diameter side of the jaw protrusion 32 b. The slide guide boss 32d has a recess-side end surface 32f on the inner diameter side thereof for positioning in an annular shape.

The adjacent laminated cores 30 are brought close to each other, and the core convex portions 31a and the core concave portions 32a are aligned to be in the state shown in fig. 27(a) and (b). At this time, the opening width of the core recess 32a surrounded by the jaw-shaped protrusion 32b and the slide guide protrusion 32d is larger than the width of the core protrusion 31a, so that the positioning can be performed smoothly.

Next, a connecting process of the laminated core 30 will be described with reference to fig. 28. Fig. 28(a) is a plan view showing a connection step, and fig. 28(b) is an enlarged view of an essential part.

The laminated core 30 is in the state shown in fig. 28(a) by applying force to the jaw-shaped protrusion 32b and deforming it. By the deformation of the jaw-shaped protrusion 32b, a hole portion 32p is formed by the jaw-shaped protrusion 32b and the slide guide protrusion 32 d. The core convex portion 31a is sandwiched and fixed by the jaw-shaped protrusion 32b, the slide guide protrusion 32d, and the core concave portion 32 a.

Further, the jaw protrusion pressure applying portion 32m and the jaw protrusion receding concave portion 31m are fitted, thereby also suppressing rotation of the laminated cores 30. Thus, the coupled laminated core 38 can be easily conveyed and wound as one body, as in the laminated core 110 of the comparative example described in embodiment 1.

Here, the jaw-shaped protrusion 32b is connected to the plate-shaped core piece via the thin portion 32g and the deformation escape groove 32h, and the force required for deformation of the jaw-shaped protrusion 32b can be reduced. The deformation escape groove 32h suppresses out-of-plane deformation and springback, thereby improving shape accuracy.

Next, a chamfering process of the laminated core 30 will be described with reference to fig. 29. Fig. 29(a) is a plan view showing a chamfering step, and fig. 29(b) is an enlarged view of an essential part.

The laminated core 30 is rotated as shown in fig. 29(a), and the concave-side end surface 32f and the convex-side end surface 31f are deformed into an annular shape by abutting.

In fig. 28(b), the jaw protrusion pressure applying portion 32m and the jaw protrusion retreating recess 31m are in close contact. In contrast, in fig. 29(b), the distance is changed by the relative rotation, and a jaw protrusion interference 32n, which is a portion where a part of the jaw protrusion pressure applying portion 32m bites against the jaw protrusion retracting recess 31m, is generated. Actually, the jaw protrusion 32b is elastically deformed toward the outer diameter side, whereby the jaw protrusion interference 32n becomes zero, and the jaw protrusion retreating concave portion 31m is pressed by the elastic deformation amount. By this pressing, the laminated cores 30 can be fixed to each other.

The winding operation is performed after the connection step, but is omitted because the same contents as those described in the laminated core 110 of the comparative example are used.

In the laminated core according to embodiment 3, the laminated core can be manufactured with a small mold as in embodiments 1 and 2, and therefore, the mold cost can be reduced. In addition, since the same equipment as that for the laminated core 110 of the comparative example can be used in the winding step, the equipment investment cost can be suppressed to a low level. Further, since the connection step is performed only 1 time, the number of manufacturing steps can be reduced as compared with embodiments 1 and 2.

As described above, embodiment 3 simplifies the structure and manufacturing method of the laminated core by only 1 step of deformation of the jaw-shaped protrusion. Therefore, the laminated cores and the method for manufacturing the same according to embodiment 3 can easily connect the laminated cores, and can reduce the size of the mold. In addition, the equipment investment cost can be reduced, and the manufacturing man-hours can be reduced.

In addition, the present invention can freely combine the respective embodiments within the scope of the present invention, or appropriately modify or omit the embodiments.

Industrial applicability

The present invention provides a laminated core and a method for manufacturing the same, in which laminated cores can be easily connected and a mold can be reduced in size, and thus a motor and the like can be widely applied.

Claims

1. A laminated core in which a plurality of laminated cores, each having a plate-like core piece of the same shape laminated and fixed thereon, are connected to each other to form a ring shape,

a convex portion is provided at one end portion of the laminated core, a concave portion is provided at the other end portion of the laminated core,

a notch is formed in a part of the outer peripheral side of the recess,

the concave portion has a configuration deformable into a C-shape so as to form a hole portion surrounding the convex portion,

a portion of the outer peripheral side of the recess having the cutout is a thin portion,

the cut-out is provided with a relief groove,

the recess is of a configuration capable of 2 stages of deformation,

the 2-stage deformation includes:

a 1 st-stage deformation in which the recesses are U-shaped, whereby the laminated cores are connected to each other in a state of being slidable in the circumferential direction, and the teeth of the laminated cores can be slid in a direction of being separated from each other and in a direction of being close to each other without the laminated cores falling off from each other; and

the recessed portions are formed in the C-shape, whereby the laminated cores are fixed to each other by the deformation in the 2 nd stage.

2. The laminated core according to claim 1,

in the laminated core, the inner diameter side of the base portion of the convex portion has a valley portion having a shape corresponding to the projection provided at the inner diameter side tip portion of the concave portion, and thus the laminated core can be formed into a ring shape with high accuracy.

3. The laminated core according to claim 1,

a protrusion is provided on the inner diameter side of the base of the convex portion, the tip of the protrusion is formed to have a right-angled or inclined structure,

the inner diameter side of the base of the projection constituting the inner diameter side of the recess is formed to have a right-angled or inclined structure.

4. A laminated core in which a plurality of laminated cores, each having a plate-like core piece of the same shape laminated and fixed thereon, are connected to each other to form a ring shape,

a notch is formed in a part of the outer peripheral side of the recess,

the cut-out is provided with a relief groove,

has a configuration having a convex portion extending circumferentially on an outer peripheral side of the convex portion at a position contacting with a front end portion on the outer peripheral side of the concave portion,

the concave portion is prevented from being deformed and restored by springback after being deformed into the C-shape.

5. The laminated core according to claim 4,

the recess is of a configuration capable of 2 stages of deformation,

the 2-stage deformation includes:

a 1 st stage deformation in which the laminated cores are connected to each other in a state of being slidable in the circumferential direction by forming the recess into a U shape; and

6. A laminated core in which a plurality of laminated cores, each having a plate-like core piece of the same shape laminated and fixed thereon, are connected to each other to form a ring shape,

a notch is formed in a part of the outer peripheral side of the recess,

the recess is of a configuration capable of 2 stages of deformation,

the 2-stage deformation includes:

a 1 st-stage deformation in which the recesses are U-shaped, whereby the laminated cores are connected to each other in a state of being slidable in the circumferential direction, and the teeth of the laminated cores can be slid in directions of moving away from and moving closer to each other without the laminated cores coming off from each other; and

7. A laminated core in which a plurality of laminated cores, each having a plate-like core piece of the same shape laminated and fixed thereon, are connected to each other to form a ring shape,

a notch is formed in a part of the outer peripheral side of the recess,

8. A laminated core in which a plurality of laminated cores, each having a plate-like core piece of the same shape laminated and fixed thereon, are connected to each other to form a ring shape,

a notch is formed in a part of the outer peripheral side of the recess,

the projection forming the outer diameter side of the concave part is provided with a projecting part on the inner diameter base part side of the projection and a valley part on the inner diameter front end side,

on the other hand, the structure is provided with a protruding part on the outer diameter side of the base part of the convex part,

when the laminated cores are arranged in a linear state, the protruding portions of the concave portions and the protruding portions of the convex portions come into contact with each other, and the teeth portions of the laminated cores can be slid in a direction away from each other without the laminated cores falling off from each other,

the laminated core has a structure in which the valley portions of the recessed portions and the protruding portions of the protruding portions are fitted to each other when the laminated cores are arranged in a circular ring shape.

9. A method for manufacturing a laminated core having a plurality of laminated cores connected to each other in an annular shape, wherein,

the laminated core has a convex portion at one end portion of the laminated core, a concave portion at the other end portion of the laminated core, and a notch at a portion on an outer peripheral side of the concave portion, the concave portion being deformable into a C-shape so as to form a hole portion surrounding the convex portion,

the manufacturing method uses the laminated core and comprises the following steps:

an alignment step of inserting the convex portion of the 1 st laminated core into the concave portion of the 2 nd laminated core;

a temporary connection step of deforming the recessed portions into a U-shape to form holes surrounding the raised portions of the 1 st laminated core, preventing the laminated cores from falling off from each other, and allowing the teeth portions of the laminated cores to slide in a direction away from each other without the laminated cores falling off from each other;

a winding step of winding a tooth portion of the laminated core; and

and a primary connecting step of deforming the recessed portions from the U-shape to the C-shape to fix the laminated cores to each other in an annular shape.

10. The method of manufacturing a laminated core according to claim 9, wherein,

in the winding step, the windings are simultaneously wound around the plurality of teeth.

11. The method of manufacturing a laminated core according to claim 9 or 10, wherein the step of forming the laminated core further comprises the step of forming a core layer,

in the temporary connection step, the outer peripheral sides of the recesses at a plurality of locations are simultaneously deformed.

12. The method of manufacturing a laminated core according to claim 9 or 10, wherein the step of forming the laminated core further comprises the step of forming a core layer,

in the primary joining step, after the laminated core is deformed into an annular shape, the outer shape of the laminated core is pressed from the outer periphery, and the outer diameter side of the recess is simultaneously deformed to form an annular laminated core.

13. The method of manufacturing a laminated core according to claim 9 or 10, wherein the step of forming the laminated core further comprises the step of forming a core layer,

in the primary joining step, after the laminated core is deformed into an annular shape, the laminated core is pressed from the inner diameter side and the outer diameter side of the laminated core to deform the outer diameter side of the recess in order, thereby forming an annular laminated core.