JP7047847B2 - Stator core manufacturing method, motor with stator core manufacturing method, stator core manufacturing equipment and laminated member manufacturing method - Google Patents

Description

The present invention relates to a stator core manufacturing method, a motor provided with a stator core manufactured by the stator core manufacturing method, a stator core manufacturing apparatus, and a manufacturing method of a laminated member.

As a method of manufacturing a stator core of a motor, a method of punching a steel plate into the shape of a stator core by a pressing device or the like and laminating a plurality of punched molded steel plates in the thickness direction is known. Further, when winding the stator coil around the teeth of the stator core, by dividing the stator core into a plurality of parts in the circumferential direction, the work efficiency is improved while increasing the number of times the stator coil is wound around the teeth. There are also known ways to improve.

As a method for manufacturing a stator core as described above, for example, as disclosed in Patent Document 1, a stator core formed by laminating a plurality of annular plate members is divided along the circumferential direction to form a divided core. A method for manufacturing a brushless motor for an electric power steering device that forms a unit is known. In this manufacturing method, a stator is obtained by winding windings individually around the split core unit and then rejoining the split core units in the same combination as at the time of splitting.

In the manufacturing method disclosed in Patent Document 1, after the joint portion of the core piece is half-pulled by half-blank processing, the joint portion is pushed back by a punch and a die. As a result, the joint portion can be cut along the joint line without causing burrs on the fracture surface. Further, since the joint portion has the uneven fitting structure, the plate members can be laminated in the thickness direction without being separated at the joint portion.

Japanese Unexamined Patent Publication No. 2016-0264669

As in the configuration disclosed in Patent Document 1 described above, after punching a steel plate into the shape of a core piece (divided core piece), the punched portion is returned to the original position of the steel plate (hereinafter, pushback processing). When the stator core is manufactured using the above), it is necessary to divide the laminate obtained by laminating the molded steel sheets formed by the pushback process into a plurality of divided cores.

Although not disclosed in Patent Document 1, when a laminated body obtained by laminating a plurality of molded steel sheets in the thickness direction is divided, an interval between teeth at one end of the laminated body in the laminating direction is used. In addition, a method of driving a wedge to divide the laminated body in the circumferential direction can be considered.

However, in such a dividing method, a force is applied to the laminated body from the inside toward the diagonally outward side, so that the steel plate constituting the laminated body may be peeled off.

An object of the present invention is to manufacture a stator core that can be easily and easily divided into a laminate obtained by laminating a plurality of molded steel plates in the thickness direction without peeling of the steel plates constituting the laminate. To provide a method.

The stator core manufacturing method according to the embodiment of the present invention is a method for manufacturing a stator core in which a split core in which a plurality of plate-shaped split core pieces are laminated is arranged in an annular shape about a central axis. In this stator core manufacturing method, a part of a steel plate is punched in the shape of the split core piece in the axial direction of the central axis, and then the punched split core piece is returned to the original position of the steel plate by pushback processing. A pushback step of forming a molded steel sheet in which a plurality of divided core piece molded portions to be the divided core pieces are arranged in an annular shape, and a laminated body formation in which the molded steel sheets are laminated in the axial direction to obtain a cylindrical laminated body. It includes a step and a dividing step of applying a force of a component in a direction perpendicular to the laminating direction of the molded steel sheet to the outer peripheral side of the laminated body to divide the laminated body into the plurality of divided cores.

According to the stator core manufacturing method according to the embodiment of the present invention, the laminated body obtained by laminating a plurality of molded steel sheets in the thickness direction can be easily separated from the steel plates constituting the laminated body. Moreover, it can be easily divided.

FIG. 1 is a diagram schematically showing a schematic configuration of a motor according to an embodiment in a cross section including a central axis. FIG. 2 is a perspective view showing a schematic configuration of the stator core. FIG. 3 is a flowchart showing a method of manufacturing a stator core. FIG. 4 is a plan view of the electrical steel sheet before forming the divided core piece molded portion. FIG. 5 is a plan view showing a schematic configuration of a molded steel sheet. FIG. 6 is a diagram schematically showing (a) a state in which the first tool is moved with respect to the second tool and (b) a state in which the first tool is returned to the original position in pushback machining. be. FIG. 7 is a perspective view showing a schematic configuration of a molded steel sheet laminate in which a plurality of molded steel sheets are laminated in the thickness direction. FIG. 8 is a top view showing a schematic configuration of the stator core laminate after the cutting process. FIG. 9 is a top view showing a schematic configuration of the stator core dividing device. FIG. 10 is a cross-sectional view taken along the line XX in FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. FIG. 12 is a perspective view showing a state in which the stator core laminate is divided into a plurality of divided cores.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated. Further, the dimensions of the constituent members in each drawing do not faithfully represent the dimensions of the actual constituent members and the dimensional ratio of each constituent member.

In the following description, the direction parallel to the central axis of the rotor is the "axial direction", the direction orthogonal to the central axis is the "radial direction", and the direction along the arc centered on the central axis is the "circumferential direction". Each is called. However, the definition of this direction does not intend to limit the direction when the motor according to the present invention is used.

Further, in the following description, the expressions such as "fixed", "connected" and "attached" (hereinafter referred to as "fixed") are used not only when the members are directly fixed to each other but also via other members. Including the case where it is fixed. That is, in the following description, the expression such as fixing includes the meaning of direct and indirect fixing between members.

(Structure of Motor) FIG. 1 shows a schematic configuration of a motor 1 according to an embodiment of the present invention. The motor 1 includes a rotor 2, a stator 3, a housing 4, and a lid plate 5. The rotor 2 rotates about the central axis P with respect to the stator 3. In the present embodiment, the motor 1 is a so-called inner rotor type motor in which the rotor 2 is rotatably arranged around the central axis P in the cylindrical stator 3.

The rotor 2 includes a shaft 20, a rotor core 21, and a magnet 22. The rotor 2 is arranged radially inside the stator 3 and is rotatable with respect to the stator 3.

In this embodiment, the rotor core 21 has a cylindrical shape extending along the central axis P. The rotor core 21 is configured by laminating a plurality of electromagnetic steel sheets formed in a predetermined shape in the thickness direction.

A shaft 20 extending along the central axis P is fixed to the rotor core 21 in a state of penetrating in the axial direction. As a result, the rotor core 21 rotates together with the shaft 20. Further, in the present embodiment, a plurality of magnets 22 are arranged at predetermined intervals in the circumferential direction on the outer peripheral surface of the rotor core 21. The magnet 22 may be a ring magnet connected in the circumferential direction.

The stator 3 is housed in the housing 4. In the present embodiment, the stator 3 has a tubular shape, and the rotor 2 is arranged inside in the radial direction. That is, the stator 3 is arranged so as to face the rotor 2 in the radial direction. The rotor 2 is rotatably arranged about the central axis P inside the stator 3 in the radial direction.

The stator 3 includes a stator core 31, a stator coil 36, and a bracket 37. In the present embodiment, the stator core 31 has a cylindrical shape extending in the axial direction. The stator core 31 has a plurality of electrical steel sheets formed in a predetermined shape and laminated in the thickness direction. In this embodiment, the stator core 31 has a plurality of split cores 32 as described later.

As shown in FIG. 2, the stator core 31 has a plurality of teeth 31b extending radially inward from the tubular yoke 31a. The stator coil 36 is wound on a bracket 37 made of an insulating material (for example, an insulating resin material) mounted on the teeth 31b of the stator core 31. The bracket 37 is arranged on both end faces in the axial direction of the stator core 31.

The stator core 31 has a plurality of split cores 32 arranged in an annular shape about the central axis P. In the example shown in FIG. 2, the stator core 31 has 12 split cores 32. Each split core 32 has a split yoke portion 32a forming a part of the tubular yoke 31a and one tooth 31b.

The number of split cores 32 constituting the stator core 31 is appropriately determined according to the number of teeth 31b. That is, if the number of teeth of the stator core is more than 12, the number of split cores is more than 12. On the other hand, if the number of teeth of the stator core is less than 12, the number of split cores is less than 12.

The divided core 32 has a plate-shaped divided core piece 33 in which a plurality of sheets are laminated. In the example shown in FIG. 2, the plurality of divided core pieces 33 constituting the divided core 32 have the same shape. The split core piece 33 has a split yoke piece 33a forming a part of the split yoke portion 32a and a teeth piece 33b forming a part of the teeth 31b. The plurality of divided core pieces 33 are connected to each other by the caulking portions 33c provided on the divided yoke pieces 33a and the teeth pieces 33b, respectively, in a state of being laminated in the thickness direction.

The circumferential end of the split yoke portion 32a and the circumferential end of the split yoke portion 32a adjacent to the split yoke portion 32a in the circumferential direction are in contact with each other. As a result, the annular yoke 31a of the stator core 31 is configured by the split yoke portions 32a in the plurality of split cores 32.

The housing 4 has a tubular shape and extends along the central axis P. In the present embodiment, the housing 4 has a cylindrical shape having an internal space capable of accommodating the rotor 2 and the stator 3 inside. The housing 4 has a cylindrical side wall 4a and a bottom portion 4b that covers one axial end of the side wall 4a. The axially opposite opening of the housing 4 is covered by the lid plate 5. The housing 4 and the lid plate 5 are made of, for example, a material containing iron. By covering the opening of the bottomed cylindrical housing 4 with the lid plate 5, an internal space is formed inside the housing 4. Although not particularly shown, the lid plate 5 may be fixed to the housing 4 by, for example, a bolt or a method such as press fitting or bonding. The housing 4 and the lid plate 5 are not limited to the material containing iron, and may be made of other materials such as aluminum (including an aluminum alloy).

(Method for Manufacturing Stator Core) Next, a method for manufacturing the stator core 31 having the above-described configuration will be described with reference to FIGS. 3 to 8.

FIG. 3 is a flowchart showing an example of a method for manufacturing the stator core 31. FIG. 4 is a plan view of the electrical steel sheet 40 before forming the divided core piece forming portion 41. FIG. 5 is a plan view showing a molded steel plate 50 in which the divided core piece forming portion 41 to be the divided core piece 33 is formed. FIG. 6 is a diagram schematically showing pushback processing. FIG. 7 is a perspective view showing a molded steel plate laminate 60 in which a plurality of molded steel plates 50 are laminated in the thickness direction. FIG. 8 is a plan view showing the stator core laminate 70 obtained by cutting the molded steel plate laminate 60.

First, a circular central hole 40a is punched in an electromagnetic steel plate which is a magnetic material. This step is the central hole punching step shown in FIG. 3 (step S1). The center of the central hole 40a coincides with the central axis P of the motor 1.

Next, a plurality of slots 40b are punched around the central hole 40a in order to form a plurality of tooth pieces 33b surrounding the central hole 40a. This step is the slot punching step shown in FIG. 3 (step S2).

The above-mentioned central hole punching step and slot punching step are performed by press working. Since the central hole punching step and the slot punching step are the same as the conventional stator core manufacturing method, detailed description thereof will be omitted.

FIG. 4 shows an electromagnetic steel sheet 40 (hereinafter referred to as a steel sheet) in which a central hole 40a and a slot 40b are formed as described above.

As shown in FIG. 4, the outer shape of the steel sheet 40 is punched into a predetermined polygonal shape, and a plurality of through holes 40c are punched on the outer peripheral side. The outer shape of the steel plate 40 and the through hole 40c may be punched at the same time as the above-mentioned central hole punching step or slot punching step, or before or after the central hole punching step and slot punching step, or their steps. You may go between.

Next, in the steel plate 40 in which the central hole 40a and the slot 40b are formed as described above, as shown in FIG. 5, the divided core piece forming portion 41 serving as the divided core piece 33 is provided on the outer peripheral side of the central hole 40a. Form multiple rings side by side. The split core piece molding portion 41 has a split yoke piece molding portion 41a that becomes a split yoke piece 33a and a tooth piece 33b. In the step of molding the split core piece molding portion 41, the split yoke piece molding portion 41a is molded. Specifically, in the step of forming the split core piece forming portion 41, the outer side of the steel plate 40 from the tooth piece 33b with respect to the center of the central hole 40a is punched out in the shape of the split yoke piece 33a in the thickness direction. , So-called pushback processing is performed to return the punched portion to the original position. This step is the pushback step shown in FIG. 3 (step S3).

As shown in FIG. 6, the pushback processing includes a first tool W1 having a pair of upper and lower tools for sandwiching a part of the steel plate 40 in the thickness direction, and a pair of upper and lower tools for sandwiching a part of the steel plate 40 in the thickness direction. This is done using the second tool W2. The first tool W1 is movable with respect to the second tool W2 in the thickness direction of the steel plate 40. In the present embodiment, the first tool W1 has the same shape as the split yoke piece 33a.

As shown in FIG. 6A, the first tool W1 moves in one direction in the thickness direction of the steel plate 40 with respect to the second tool W2, so that the portion of the steel plate 40 sandwiched between the first tool W1 and the second tool. 2 Shearing is performed at the boundary with the portion sandwiched between the tools W2. The moving distance of the first tool W1 with respect to the second tool W2 may be a moving distance that separates the steel plate 40, or may be a moving distance that does not separate the steel plate 40.

After that, as shown in FIG. 6B, the first tool W1 is returned to the original position by moving the first tool W1 to the other side in the thickness direction of the steel plate 40 with respect to the second tool W2. As a result, at the boundary, the portion of the steel plate 40 sandwiched between the first tool W1 is fitted into the portion sandwiched between the second tool W2.

The split yoke piece forming portion 41a has an extruded portion 42 in which the pushback process as described above is performed, and a non-extruded portion 43 that is not extruded. As shown in FIG. 5, the extruded portions 42 and the non-extruded portions 43 are alternately located in the circumferential direction.

A dividing portion 44 is formed between the extruded portion 42 and the portion that is not extruded by the pushback process. That is, a divided portion 44 is formed by pushback processing at the boundary between the extruded portion 42 and the non-extruded portion 43 and the boundary between the extruded portion 42 and the outer peripheral side of the steel plate 40, respectively. In the dividing portion 44, the extruded portion 42 is held by friction with respect to the other portions.

Here, the step of forming the molded steel sheet 50 in which a plurality of the divided core piece forming portions 41 to be the divided core piece 33 are arranged in an annular shape by the pushback process as described above corresponds to the pushback process.

As described above, by forming the split yoke piece forming portion 41a by pushback processing, the split yoke piece forming portion 41a is not bent at the time of processing. This makes it possible to suppress the generation of residual stress and residual strain due to processing. Therefore, the dimensional accuracy of the split core piece 33, that is, the stator core 31 can be improved. Further, by suppressing the generation of residual stress and residual strain as described above, the turbulence of the magnetic flux flow in the split core piece 33 can be suppressed, so that the deterioration of the magnetic characteristics of the stator core 31 can be suppressed.

As described above, after the split yoke piece forming portion 41a is formed on the steel plate 40 by pushback processing, the caulking portion 33c is formed on the divided yoke piece forming portion 41a and the tooth piece 33b. The caulked portion 33c is obtained by forming a convex portion on the split yoke piece forming portion 41a and the tooth piece 33b so as to protrude in one direction in the thickness direction and have a concave portion on the surface on the other side in the thickness direction. The step of forming the crimped portion 33c is the crimped portion forming step shown in FIG. 3 (step S4).

After that, the molded steel plates 50 on which the split yoke piece molded portions 41a are formed are laminated in the thickness direction, and the caulked portions 33c of the adjacent molded steel plates 50 are crimped to form the molded steel plate laminate 60 as shown in FIG. To get. This step is the laminating step shown in FIG. 3 (step S5).

Then, the molded steel plate laminate 60 is cut at the cutting position X (the position shown by the broken line in FIG. 7) on the outer peripheral side of the split yoke piece forming portion 41a by electric discharge machining or the like, as shown in FIG. A stator core laminate 70 is obtained. This step is the processing step shown in FIG. 3 (step S6). The cutting position X when cutting the molded steel sheet laminate 60 is a position on the inner peripheral side of the outer peripheral end of the split yoke piece forming portion 41a.

The laminating step of laminating the molded steel sheets 50 in the thickness direction to obtain the molded steel sheet laminate 60 and the processing step of cutting the molded steel sheet laminate 60 to obtain the stator core laminate 70 are the laminate forming steps. Corresponds to.

Even after the molded steel sheet laminated body 60 is cut at the cutting position X as described above, the divided portion 44 remains between the adjacent divided yoke piece forming portions 41a in the stator core laminated body 70. As a result, as will be described later, the stator core laminate 70 can be divided into a plurality of divided cores 32.

(Division of Stator Core Laminated Body) Next, a method of dividing the stator core laminated body 70 (laminated body) into a plurality of divided cores 32 will be described with reference to FIGS. 9 to 12.

FIG. 9 is a top view showing a schematic configuration of a stator core dividing device 100 (stator core manufacturing device) that divides the stator core laminate 70 into a plurality of dividing cores 32. FIG. 10 is a cross-sectional view taken along the line XX in FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. FIG. 12 is a perspective view showing a state in which the stator core laminate 70 is divided into a plurality of divided cores 32.

The stator core dividing device 100 supports a holding portion 101 for holding the stator core laminate 70, an external force applying portion 110 for applying a force to the side surface of the stator core laminated body 70, and the holding portion 101 and the external force applying portion 110. A frame 120 is provided.

The holding portion 101 has a pair of holding members 102 that sandwich a part of the outer peripheral side of the cylindrical stator core laminated body 70 in the radial direction. The pair of holding members 102 can be moved back and forth with respect to the frame 120 by the screws 103. The pair of holding members 102 have an arcuate contact surface 102a in top view, which is in contact with the outer peripheral side of the rotor core laminated body 70.

The external force applying portion 110 includes a pin 111 that applies a force of a component in the direction perpendicular to the stacking direction to the stator core laminated body 70, and an actuator 112 that advances and retreats the pin 111. That is, the pin 111 of the external force applying portion 110 applies the force of the component in the vertical direction to the outer peripheral side of the stator core laminate 70 held by the holding portion 101. As a result, the stator core laminate 70 can be deformed in the radial direction. Therefore, in the stator core laminated body 70, the divided portions 44 located between the adjacent divided yoke piece forming portions 41a are separated, and as shown in FIG. 12, the stator core laminated body 70 is divided into a plurality of divided cores 32. It is divided.

As described above, by applying the force of the component in the vertical direction to the outer peripheral side of the stator core laminate 70, the stator core laminate while suppressing the steel plate constituting the stator core laminate 70 from peeling off. The body 70 can be divided into a plurality of divided cores 32.

Further, although not particularly shown, when the stator core laminated body 70 is divided into a plurality of divided cores 32, the pin 111 of the external force applying portion 110 sequentially applies to a plurality of locations in the circumferential direction of the stator core laminated body 70. The force of the vertical component is applied. As a result, the stator core laminate 70 can be quickly and easily divided into a plurality of divided cores 32.

When the force of the component in the vertical direction is applied to a plurality of locations in the circumferential direction of the stator core laminated body 70, a plurality of divided core piece molding portions arranged in an annular shape in the circumferential direction in the stator core laminated body 70. Of the 41, it is preferable to apply the force of the component in the vertical direction to the outer peripheral side of the stator core laminate 70 with respect to the plurality of divided core piece forming portions 41 separated from each other. As a result, the stator core laminate 70 can be efficiently divided into a plurality of divided cores 32. The divided core piece forming portions 41 separated from each other mean the divided core piece forming portions 41 which are not adjacent to each other in the circumferential direction.

In the present embodiment, the pin 111 of the external force applying portion 110 is located so as to face the central portion of the stator core laminated body 70 in the laminating direction. Thereby, the force of the component in the vertical direction can be applied to the central portion of the stator core laminated body 70 in the stacking direction by the pin 111. Therefore, the stator core laminate 70 can be efficiently divided into a plurality of divided cores 32.

Further, the pin 111 of the external force applying portion 110 is a force of the component in the vertical direction on the outer peripheral side of the stator core laminated body 70 with respect to the portion between the tooth pieces 33b adjacent to each other in the circumferential direction in the stator core laminated body 70. Add. As a result, the stator core laminate 70 can be efficiently divided into a plurality of divided cores 32.

In the present embodiment, the pin 111 of the external force applying portion 110 is laminated with the stator core with respect to the boundary portion (divided portion 44) of the plurality of divided core piece forming portions 41 arranged in an annular shape in the circumferential direction in the stator core laminated body 70. The force of the component in the vertical direction is applied to the outer peripheral side of the body 70. As a result, the stator core laminate 70 can be more efficiently divided into a plurality of divided cores 32.

As described above, the stator core laminated body 70 is divided into a plurality of divided cores 32 by applying the force of the component in the direction perpendicular to the laminating direction of the molded steel plate 50 to the outer peripheral side of the stator core laminated body 70. The step corresponds to the dividing step (step S7 in FIG. 3).

According to the configuration of the present embodiment, a plurality of stator core laminates 70 obtained by laminating the molded steel plates 50 press-formed in the shape of the split core pieces 33 in the pushback step in the thickness direction, each having teeth 31b. Can be easily divided into the divided cores 32 of. Moreover, by applying a force of the component in the direction perpendicular to the laminating direction of the molded steel plate 50 to the outer peripheral side of the stator core laminated body 70, it is possible to prevent the steel plates constituting the stator core laminated body 70 from peeling off. can.

(Other Embodiments) Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the embodiment is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented within a range that does not deviate from the gist thereof.

In the above embodiment, when the stator core laminated body 70 is divided into a plurality of divided cores 32, the stator core laminated body 70 is perpendicular to the stacking direction of the stator core laminated body 70 at a plurality of locations on the outer peripheral side of the stator core laminated body 70. Apply the force of the component of the direction. However, the force of the component in the vertical direction may be applied to one place on the outer peripheral side of the stator core laminate. Further, the force of the component in the vertical direction may be applied to a predetermined range in the stacking direction on the outer peripheral side of the stator core laminate. In this way, by applying a force to a predetermined range in the stacking direction of the stator core laminated body, the stator core laminated body can be more efficiently divided into a plurality of divided cores 32.

In the above embodiment, when the stator core laminated body 70 is divided into a plurality of divided cores 32, among the plurality of divided core piece molding portions 41 arranged in a ring shape in the circumferential direction in the stator core laminated body 70, they are separated from each other. The force of the component in the vertical direction is applied to the outer peripheral side of the stator core laminate 70 with respect to the plurality of divided core piece forming portions 41. However, the force of the component in the vertical direction may be applied to the outer peripheral side of the stator core laminate with respect to the divided core piece forming portions 41 adjacent to each other in the circumferential direction in the stator core laminate.

In the above embodiment, when the stator core laminated body 70 is divided into a plurality of divided cores 32, the force of the component in the vertical direction is applied to the central portion of the stator core laminated body 70 in the stacking direction. However, the force of the component in the vertical direction may be applied to the central portion of the stator core laminated body 70 in the stacking direction.

In the above embodiment, when the stator core laminated body 70 is divided into a plurality of divided cores 32, the stator core laminated body is formed with respect to the portion between the tooth pieces 33b adjacent to each other in the circumferential direction in the stator core laminated body 70. The force of the component in the vertical direction is applied to the outer peripheral side of the 70. Further, in the above-described embodiment, the stator core laminated body 70 is located on the outer peripheral side of the stator core laminated body 70 with respect to the boundary portion (divided portion 44) of the plurality of divided core piece forming portions 41 arranged in an annular shape in the circumferential direction. Apply the force of the vertical component. However, if the stator core laminated body 70 can be divided into a plurality of divided cores 32, the force of the component in the vertical direction may be applied to any position on the outer peripheral side of the stator core laminated body 70.

In the above embodiment, the stator core laminated body 70 is obtained by cutting the molded steel sheet laminated body 60 at the cutting position X in the processing step. However, the steel plate constituting the stator core laminate may be formed in the pushback step. This makes it possible to omit the processing step in the method for manufacturing the stator core.

In the above embodiment, the motor is a so-called permanent magnet motor. In a permanent magnet motor, the rotor has a magnet. However, the motor 1 may be a motor without a magnet, such as an inducer, a reluctance motor, a switch reluctance motor, or a winding field type motor.

Although the method for manufacturing the stator core 31 of the motor 1 is described in the above embodiment, the method is not limited to this, and the manufacturing method of the above-described embodiment is applied when manufacturing a structure having a laminated body of steel plates. You may.

That is, the manufacturing method of the above-described embodiment may be applied to a manufacturing method of a laminated member in which a divided portion in which a plurality of plate-shaped divided pieces are laminated is arranged in an annular shape about a central axis. The method for manufacturing the laminated member is to punch out a part of the steel sheet in the shape of the divided piece in the thickness direction, and then push back the punched portion back to the original position of the steel plate to form the divided piece. A push-back step of forming a plurality of molded steel sheets in which a plurality of molded portions are arranged in an annular shape, a laminate forming step of laminating the molded steel sheets in the thickness direction to obtain a tubular laminate, and an outer peripheral side of the laminate. On the other hand, the present invention includes a dividing step of applying a force of a component in a direction perpendicular to the laminating direction of the steel sheet to divide the laminated body into the plurality of divided portions.

The divided piece corresponds to the divided core piece 33 in the above-described embodiment, and the divided portion corresponds to the divided core 32 in the above-described embodiment. Further, the laminated member corresponds to the stator core 31 in the above-described embodiment, and the divided piece forming portion corresponds to the divided core piece forming portion 41 in the above-described embodiment.

INDUSTRIAL APPLICABILITY The present invention is applicable to a method for manufacturing a stator core in which a plurality of plate-shaped divided core pieces are laminated and the stator core is arranged in an annular shape about a central axis.

1 Motor 2 Rotor 3 Stator 31 Stator core 31a York 31b Teeth 32 Split core 32a Split yoke part 33 Split core piece 33a Split yoke piece 33b Teeth piece 33c Caulking part 40 Electrical steel sheet (steel plate) 40a Central hole 40b Slot 40c Through hole 41 Split core piece forming part 41a Dividing yoke piece forming part 42 Extruding part 43 Non-extruding part 44 Dividing part 50 Formed steel plate 60 Formed steel plate laminate 70 Stator core laminate (laminate) 100 Stator core splitting device (Stator core manufacturing) Device) 101 Holding part 110 External force applying part P Central axis W1 First tool W2 Second tool X Cutting position

Claims (10)

A split core in which a plurality of plate-shaped split core pieces are laminated is a method for manufacturing a stator core in which a plurality of plate-shaped split core pieces are laminated in a ring shape about a central axis. After punching in the axial direction of the shaft, the punched-out split core piece is returned to the original position of the steel sheet by push-back processing, so that a molded steel sheet in which a plurality of split core piece molded portions to be the split core pieces are arranged in an annular shape is produced. A push-back step of forming, a laminate forming step of laminating the molded steel sheets in the axial direction to obtain a cylindrical laminate, and a laminate forming step of obtaining a cylindrical laminate, and a process perpendicular to the outer peripheral side of the laminate with respect to the laminate direction of the molded steel sheets. A method for producing a stator core, comprising a dividing step of dividing the laminated body into the plurality of divided cores by applying a force of components in a direction. In the stator core manufacturing method according to claim 1, in the division step, the force of the component in the vertical direction is applied to a plurality of locations in the circumferential direction of the laminate on the outer peripheral side of the laminate to apply the force of the component in the vertical direction to the laminate. A stator core manufacturing method for dividing the above into a plurality of divided cores. In the stator core manufacturing method according to claim 2, the dividing step is performed on a plurality of divided core piece forming portions separated from each other among the plurality of divided core piece forming portions arranged in a ring shape in the circumferential direction in the laminated body. On the other hand, a stator core manufacturing method in which a force of the component in the vertical direction is applied to the outer peripheral side of the laminate to divide the laminate into the plurality of divided cores. In the stator core manufacturing method according to any one of claims 1 to 3, in the splitting step, the force of the component in the vertical direction is applied to a predetermined range in the stacking direction on the outer peripheral side of the laminated body. A stator core manufacturing method for dividing the laminated body into the plurality of divided cores. In the stator core manufacturing method according to any one of claims 1 to 3, in the splitting step, the force of the component in the vertical direction is applied to the central portion in the stacking direction on the outer peripheral side of the laminated body. A stator core manufacturing method for dividing the laminated body into the plurality of divided cores. In the stator core manufacturing method according to any one of claims 1 to 5, the split core has a split yoke portion extending in the circumferential direction and a teeth portion extending in the radial direction from the split yoke portion. In the pushback step, a split yoke piece to be the split yoke portion and a teeth piece to be the teeth portion are formed on the molded steel plate by the pushback process, and the split step is a peripheral rotation in the laminated body. A stator core manufacturing method for dividing a laminate into a plurality of divided cores by applying a force of the component in the vertical direction to the outer peripheral side of the laminate with respect to a portion between pieces of teeth adjacent to each other in the direction. In the stator core manufacturing method according to any one of claims 1 to 6, the splitting step is performed with respect to the boundary portion of a plurality of split core piece molding portions arranged in an annular shape in the circumferential direction in the laminated body. A stator core manufacturing method in which a force of the component in the vertical direction is applied to the outer peripheral side of the laminate to divide the laminate into the plurality of divided cores. A method for manufacturing a motor including a stator core, which comprises a step of manufacturing the stator core by the stator core manufacturing method according to any one of claims 1 to 7. A stator core manufacturing apparatus for realizing the stator core manufacturing method according to any one of claims 1 to 7, wherein the holding portion for holding the laminate and the holding portion held by the holding portion. A stator core manufacturing apparatus comprising an external force applying portion for applying a force of the component in the vertical direction on the outer peripheral side of the laminate. A divided portion in which a plurality of plate-shaped divided pieces are laminated is a method for manufacturing a laminated member in which a plurality of plate-shaped divided pieces are laminated in an annular shape around a central axis, and a part of a steel plate is punched out in the shape of the divided pieces in the thickness direction. After that, by a pushback process of returning the punched portion to the original position of the steel sheet, a pushback step of forming a formed steel sheet in which a plurality of divided piece forming portions to be the divided pieces are arranged in an annular shape and the formed steel sheet are formed. , The step of forming a laminate to obtain a tubular laminate by laminating in the thickness direction, and the laminating by applying the force of the component in the direction perpendicular to the laminating direction of the steel sheet to the outer peripheral side of the laminate. A method for manufacturing a laminated member, comprising a division step of dividing a body into the plurality of division portions.

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