CN111033979B - Method and apparatus for manufacturing stator core, motor, and method for manufacturing laminated member - Google Patents
Method and apparatus for manufacturing stator core, motor, and method for manufacturing laminated member Download PDFInfo
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- CN111033979B CN111033979B CN201880050800.0A CN201880050800A CN111033979B CN 111033979 B CN111033979 B CN 111033979B CN 201880050800 A CN201880050800 A CN 201880050800A CN 111033979 B CN111033979 B CN 111033979B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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Abstract
The invention provides a method for manufacturing a stator core, which can simply and easily divide a laminated body formed by laminating a plurality of formed steel plates in the thickness direction. The method for manufacturing the stator core comprises the following steps: a push-back step (S3) for forming a formed steel plate in which a plurality of divided iron core piece forming portions as divided iron core pieces are arranged in a ring shape by a push-back process of punching a part of the steel plate in an axial direction of a central axis line in accordance with the shape of the divided iron core pieces and then returning the punched divided iron core pieces to original positions of the steel plate; a laminate forming step (a laminating step (S5) and a processing step (S6)) of laminating the formed steel sheets in the axial direction to obtain a cylindrical stator core laminate; and a dividing step (S7) for dividing the stator core laminated body into the plurality of divided cores by applying a force of a component in a direction perpendicular to the laminating direction of the formed steel plates to the outer peripheral side of the stator core laminated body.
Description
Technical Field
The present invention relates to a stator core manufacturing method, a motor having a stator core manufactured by the stator core manufacturing method, a stator core manufacturing apparatus, and a laminated member manufacturing method.
Background
As a method of manufacturing a stator core of a motor, a method of punching a steel plate into a shape of the stator core by a punching device or the like and laminating a plurality of punched formed steel plates in a thickness direction is known. In addition, the following methods are also known: when winding a stator coil around teeth of a stator core, the stator core is divided into a plurality of segments in the circumferential direction, thereby increasing the number of windings of the stator coil around the teeth and improving the work efficiency.
As a method for manufacturing the stator core as described above, for example, as disclosed in patent document 1, there is known a method for manufacturing a brushless motor for an electric power steering apparatus, the method including: a stator core formed by laminating a plurality of annular plate members is divided in the circumferential direction to form divided core units. In this manufacturing method, after the winding is wound around each of the divided core units, the divided core units are re-joined to each other in the same combination as in the dividing to obtain the stator.
In the manufacturing method disclosed in patent document 1, after the joint portion of the core members is half-blanked by half-blanking, the joint portion is pushed back by a punch and a die. This makes it possible to cut the joint along the joining line without generating burrs on the fracture surface. Further, since the joint portion has a concave-convex fitting structure, the plate members can be stacked in the thickness direction without being separated by the joint portion.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2016-026469
Disclosure of Invention
Problems to be solved by the invention
In the case of manufacturing a stator core by a process (hereinafter referred to as a back-push process) in which a steel plate is punched into the shape of a core member (divided core pieces) and then the punched portion is returned to the original position of the steel plate as in the configuration disclosed in patent document 1, a laminated body obtained by laminating formed steel plates formed by the back-push process needs to be divided into a plurality of divided cores.
Although not disclosed in patent document 1, the following method is considered: when a laminated body obtained by laminating a plurality of the formed steel plates in the thickness direction is divided, a wedge is driven into a tooth space at one end of the laminated body in the laminating direction to divide the laminated body in the circumferential direction.
However, in such a dividing method, since a force directed obliquely outward from the inside is applied to the laminated body, there is a possibility that the steel sheets constituting the laminated body may peel off.
The purpose of the present invention is to provide a method for manufacturing a stator core, wherein a laminated body obtained by laminating a plurality of formed steel plates in the thickness direction can be easily and easily divided without peeling the steel plates constituting the laminated body.
Means for solving the problems
A stator core manufacturing method according to an embodiment of the present invention is a manufacturing method of a stator core in which a plurality of plate-shaped divided core pieces are stacked and a divided core is annularly arranged around a central axis. The stator core manufacturing method comprises the following steps: a push-back step of forming a formed steel plate in which a plurality of split core piece forming portions as the split core pieces are arranged in a ring shape by a push-back process of punching out a part of the steel plate in an axial direction of the central axis line in accordance with a shape of the split core pieces and then returning the punched split core pieces to original positions of the steel plate; a laminate forming step of axially laminating the formed steel sheets to obtain a cylindrical laminate; and a dividing step of dividing the laminated body into the plurality of divided cores by applying a force of a component in a vertical direction perpendicular to a lamination direction of the formed steel plates to an outer peripheral side of the laminated body.
Effects of the invention
According to the stator core manufacturing method of one embodiment of the present invention, the laminated body obtained by laminating a plurality of formed steel plates in the thickness direction can be easily and easily divided without peeling the steel plates constituting the laminated body.
Drawings
Fig. 1 is a schematic configuration diagram schematically showing a motor according to an embodiment in a cross section including a central axis.
Fig. 2 is a perspective view showing a schematic structure of the stator core.
Fig. 3 is a flowchart illustrating a method of manufacturing the stator core.
Fig. 4 is a plan view of the electromagnetic steel sheet before the divided core piece molding portion is molded.
Fig. 5 is a plan view showing a schematic structure of the formed steel sheet.
Fig. 6 is a view during the push-back process, in which fig. 6 (a) is a view schematically showing a state in which the 1 st tool is moved relative to the 2 nd tool, and fig. 6 (b) is a view schematically showing a state in which the 1 st tool is returned to the original position.
Fig. 7 is a perspective view showing a schematic structure of a formed steel sheet laminate in which a plurality of formed steel sheets are laminated in the thickness direction.
Fig. 8 is a plan view schematically showing the structure of the stator core laminated body after the cutting process.
Fig. 9 is a plan view showing a schematic configuration of the stator core division device.
Fig. 10 is a cross-sectional view taken along line X-X of fig. 9.
Fig. 11 is a cross-sectional view taken along line XI-XI of fig. 9.
Fig. 12 is a perspective view showing a state in which the stator core laminated body is divided into a plurality of divided cores.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. The dimensions of the components in the drawings do not faithfully represent actual dimensions of the components, dimensional ratios of the components, and the like.
In the following description, a direction parallel to the center axis of the rotor is referred to as an "axial direction", a direction perpendicular to the center axis is referred to as a "radial direction", and a direction along an arc centered on the center axis is referred to as a "circumferential direction". However, the orientation of the motor of the present invention in use is not intended to be limited by the definition of this direction.
In the following description, expressions such as "fixed", "connected", and "attached" (hereinafter, referred to as "fixed" or the like) include not only a case where components are directly fixed to each other, but also a case where components are fixed via other components. That is, in the following description, expressions such as fixing include meanings such as direct and indirect fixing of components.
(Structure of Motor)
Fig. 1 shows a schematic structure 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 cover 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 a rotor 2 is disposed in a cylindrical stator 3 so as to be rotatable about a central axis P.
The rotor 2 includes a shaft 20, a rotor core 21, and a magnet 22. The rotor 2 is disposed radially inward of the stator 3 and is rotatable with respect to the stator 3.
In the present embodiment, the rotor core 21 is cylindrical and extends along the center axis P. The rotor core 21 is formed by laminating a plurality of electromagnetic steel plates formed into a predetermined shape in the thickness direction.
A shaft 20 extending along the center axis P is fixed to the rotor core 21 in a state of penetrating in the axial direction. Thereby, the rotor core 21 rotates together with the shaft 20. In the present embodiment, a plurality of magnets 22 are arranged at predetermined intervals in the circumferential direction on the outer circumferential surface of the rotor core 21. In addition, the magnets 22 may be ring magnets connected in the circumferential direction.
The stator 3 is housed in the case 4. In the present embodiment, the stator 3 is cylindrical, and the rotor 2 is disposed radially inward. That is, the stator 3 is disposed to face the rotor 2 in the radial direction. The rotor 2 is disposed radially inward of the stator 3 so as to be rotatable about the center axis P.
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 electromagnetic steel plates formed into a predetermined shape and laminated in the thickness direction. In the present embodiment, the stator core 31 has a plurality of divided cores 32 as described later.
As shown in fig. 2, the stator core 31 has a plurality of teeth 31b extending radially inward from a cylindrical yoke 31 a. The stator coil 36 is wound around a bracket 37 made of an insulating material (e.g., an insulating resin material) attached to the teeth 31b of the stator core 31. The brackets 37 are disposed on both end surfaces of the stator core 31 in the axial direction.
The stator core 31 has a plurality of divided cores 32 annularly arranged around a central axis P. In the example shown in fig. 2, the stator core 31 has 12 divided cores 32. Each of the split cores 32 has a split yoke portion 32a constituting a part of the cylindrical yoke 31a and one tooth 31 b.
The number of the divided cores 32 constituting the stator core 31 is appropriately determined according to the number of the teeth 31 b. That is, if the number of teeth of the stator core is greater than 12, the number of the divided cores is greater than 12. On the other hand, if the number of teeth of the stator core is less than 12, the number of the divided cores is less than 12.
The split core 32 includes a plurality of stacked plate-like split core pieces 33. 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 includes a split yoke piece 33a constituting a part of the split yoke portion 32a and a tooth piece 33b constituting a part of the tooth 31 b. The plurality of divided iron core pieces 33 are connected to each other by a pressure-bonding section 33c provided in each of the divided yoke piece 33a and the tooth piece 33b in a state of being stacked in the thickness direction.
The circumferential end of the split yoke 32a is in contact with the circumferential end of the split yoke 32a adjacent to the split yoke 32a in the circumferential direction. Thus, the annular yoke 31a of the stator core 31 is configured by the split yoke portions 32a of the plurality of split cores 32.
The housing 4 is cylindrical 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 therein. The housing 4 has a cylindrical side wall 4a and a bottom portion 4b covering one axial end of the side wall 4 a. The opening on the other axial side of the housing 4 is covered with a cover 5. The case 4 and the cover 5 are made of a material containing iron, for example. The opening of the bottomed cylindrical case 4 is covered with the lid 5, thereby forming an internal space inside the case 4. Although not particularly shown, the cover plate 5 may be fixed to the case 4 by, for example, bolts or the like, or may be fixed to the case 4 by press-fitting, bonding or the like. The case 4 and the cover 5 are not limited to materials containing iron, and may be made of other materials such as aluminum (including aluminum alloy).
(method of manufacturing stator core)
Next, a method for manufacturing the stator core 31 having the above-described structure will be described with reference to fig. 3 to 8.
Fig. 3 is a flowchart illustrating an example of a method of manufacturing the stator core 31. Fig. 4 is a plan view of the electromagnetic steel sheet 40 before the divided core segment molding portion 41 is molded. Fig. 5 is a plan view showing a formed steel plate 50 in which the divided core piece forming portion 41 as the divided core piece 33 is formed. Fig. 6 is a view schematically showing the push-back process. Fig. 7 is a perspective view showing a formed steel sheet laminate 60 in which a plurality of formed steel sheets 50 are laminated in the thickness direction. Fig. 8 is a plan view showing a stator core laminated body 70 obtained by cutting the formed steel sheet laminated body 60.
First, a circular center hole 40a is punched in an electromagnetic steel sheet as a magnetic material. This step is a center hole punching step shown in fig. 3 (step S1). The center of the center hole 40a coincides with the central axis P of the motor 1.
Next, a plurality of teeth 33b are formed so as to surround the central hole 40a, and a plurality of grooves 40b are punched around the central hole 40 a. This step is a groove punching step shown in fig. 3 (step S2).
The center hole punching step and the groove punching step are performed by press working. The center hole punching step and the slot punching step are the same as those of the conventional stator core manufacturing method, and therefore, detailed description thereof is omitted.
Fig. 4 shows an electromagnetic steel sheet 40 (hereinafter referred to as a steel sheet) in which the central hole 40a and the groove 40b are formed as described above.
As shown in fig. 4, the outer shape of the steel plate 40 is punched into a predetermined polygonal shape, and a plurality of through holes 40c are punched on the outer peripheral side. The punching of the outer shape of the steel plate 40 and the punching of the through hole 40c may be performed simultaneously with the center hole punching step or the groove punching step described above, or may be performed before, after, or between the center hole punching step and the groove punching step.
Next, in the steel plate 40 in which the center hole 40a and the groove 40b are formed as described above, as shown in fig. 5, a plurality of divided iron core piece molding portions 41 as the divided iron core pieces 33 are molded in a ring-like arrangement on the outer peripheral side of the center hole 40 a. The split core piece molding portion 41 includes a split yoke piece molding portion 41a as the split yoke piece 33a, and a tooth piece 33 b. 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 molding the divided iron core piece molding portion 41, the following so-called push-back processing is performed: in the steel plate 40, the position outside the teeth 33b with respect to the center of the center hole 40a is punched in the thickness direction in accordance with the shape of the split yoke piece 33a, and then the punched portion is returned to the original position. This step is a push-back step shown in fig. 3 (step S3).
As shown in fig. 6, the push-back processing is performed using a 1 st tool W1 and a 2 nd tool W2, the 1 st tool W1 having a pair of upper and lower tools sandwiching a part of the steel plate 40 in the thickness direction, and the 2 nd tool W2 having a pair of upper and lower tools sandwiching a part of the steel plate 40 in the thickness direction. The 1 st tool W1 is movable in the thickness direction of the steel plate 40 relative to the 2 nd tool W2. In the present embodiment, the 1 st tool W1 has the same shape as the split yoke piece 33 a.
As shown in fig. 6 (a), the 1 st tool W1 is moved in one direction of the thickness of the steel plate 40 with respect to the 2 nd tool W2, and thereby shearing work is performed at the boundary between the portion of the steel plate 40 sandwiched by the 1 st tool W1 and the portion sandwiched by the 2 nd tool W2. The movement distance of the 1 st tool W1 with respect to the 2 nd tool W2 may be a movement distance for separating the steel plate 40 or a movement distance for not separating the steel plate 40.
Then, as shown in fig. 6 (b), the 1 st tool W1 is moved in the other direction of the thickness direction of the steel sheet 40 with respect to the 2 nd tool W2, whereby the 1 st tool W1 is returned to the original position. Thus, at the boundary, the portion of the steel plate 40 sandwiched by the 1 st tool W1 is fitted into the portion sandwiched by the 2 nd tool W2.
The split yoke piece molding part 41a includes a pushing part 42 that performs the above-described pushing back process and a non-pushing part 43 that does not perform the pushing back. As shown in fig. 5, the pushing-out portions 42 and the non-pushing-out portions 43 are alternately arranged in the circumferential direction.
A dividing portion 44 is formed between the pushing portion 42 and a portion that is not pushed out by the pushing back process. That is, the divided portions 44 are formed by the pushing back process at the boundary between the pushing portion 42 and the non-pushing portion 43 and at the boundary between the pushing portion 42 and the outer circumferential side of the steel plate 40. In the dividing portion 44, the pushing portion 42 is held by friction at other portions.
Here, the step of forming the formed steel plate 50 in which the plurality of divided iron core piece forming portions 41 as the divided iron core pieces 33 are arranged in a ring shape by the push-back processing as described above corresponds to the push-back step.
The split yoke piece forming portions 41a are formed by the push-back processing as described above, so that the split yoke piece forming portions 41a are not bent at the time of processing. This can suppress the occurrence of residual stress and residual strain due to machining. This can improve the dimensional accuracy of the divided core pieces 33, i.e., the stator core 31. In addition, by suppressing the generation of the residual stress and the residual strain as described above, the disturbance of the flow of the magnetic flux in the divided core pieces 33 can be suppressed, and thus the degradation of the magnetic characteristics of the stator core 31 can be suppressed.
After the split yoke piece forming portion 41a is formed on the steel plate 40 by the push-back process as described above, the press-contact portion 33c is formed on the split yoke piece forming portion 41a and the tooth piece 33 b. The pressure-bonding part 33c is obtained by forming a convex part protruding in one thickness direction and having a concave part on the other thickness direction surface in the divided yoke piece forming part 41a and the tooth piece 33 b. The step of forming the pressure-bonding section 33c is a pressure-bonding section forming step shown in fig. 3 (step S4).
Then, the formed steel plates 50 formed with the split yoke piece forming portions 41a are stacked in the thickness direction, and the pressure-bonding portions 33c of the adjacent formed steel plates 50 are pressure-bonded, whereby a formed steel plate stacked body 60 as shown in fig. 7 is obtained. This step is a laminating step shown in fig. 3 (step S5).
Then, the laminated formed steel plate 60 is cut at a cutting position X (a position indicated by a 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, thereby obtaining a laminated stator core 70 shown in a plan view in fig. 8. This step is a processing step shown in fig. 3 (step S6). The cutting position X at which the laminated formed steel sheet body 60 is cut is located on the inner circumferential side of the outer circumferential end of the yoke piece forming portion 41 a.
The lamination step of laminating the formed steel plates 50 in the thickness direction to obtain the formed steel plate laminate 60 and the processing step of cutting the formed steel plate laminate 60 to obtain the stator core laminate 70 correspond to the laminate forming step.
After the laminated formed steel plate 60 is cut at the cutting position X as described above, the stator core laminated body 70 has the divided portions 44 remaining between the adjacent divided yoke piece forming portions 41 a. This enables the stator core laminated body 70 to be divided into a plurality of divided cores 32 as described later.
(division of stator core laminate)
Next, a method of dividing the stator core laminated body 70 (laminated body) into the plurality of divided cores 32 will be described with reference to fig. 9 to 12.
Fig. 9 is a plan view schematically showing the structure of a stator core dividing apparatus 100 (stator core manufacturing apparatus) for dividing the stator core laminated body 70 into a plurality of divided cores 32. Fig. 10 is a cross-sectional view taken along line X-X of fig. 9. Fig. 11 is a cross-sectional view taken along line XI-XI of fig. 9. Fig. 12 is a perspective view showing a state in which the stator core laminated body 70 is divided into a plurality of divided cores 32.
The stator core division device 100 includes: a holding portion 101 that holds the stator core laminated body 70; an external force applying unit 110 that applies a force to a side surface of the stator core laminated body 70; and a frame 120 that supports the holding portion 101 and the external force applying portion 110.
The holding portion 101 includes a pair of holding members 102 sandwiching 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 advance and retreat with respect to the frame 120 by the screws 103. The pair of holding members 102 has contact surfaces 102a that are in contact with the outer peripheral side of the rotor core laminated body 70 and have arc shapes in plan view.
The external force applying unit 110 includes: a pin 111 that applies a force of a component in a direction perpendicular to the lamination direction to the stator core laminated body 70; and an actuator 112 that advances and retracts the pin 111. That is, the pin 111 of the external force applying portion 110 applies the force of the above-described vertical component to the outer peripheral side of the stator core laminated body 70 held by the holding portion 101. This allows the stator core laminated body 70 to be deformed in the radial direction. Therefore, the divided portions 44 positioned between the adjacent divided yoke piece forming portions 41a in the stator core laminated body 70 are separated, and as shown in fig. 12, the stator core laminated body 70 is divided into the plurality of divided cores 32.
As described above, by applying the force of the above-described vertical component to the outer peripheral side of the stator core laminated body 70, the stator core laminated body 70 can be divided into the plurality of divided cores 32 while suppressing peeling of the steel plates constituting the stator core laminated body 70.
In addition, although not particularly shown, when the stator core laminated body 70 is divided into the plurality of divided cores 32, the pins 111 of the external force applying portion 110 sequentially apply the forces of the above-described vertical components to a plurality of portions in the circumferential direction of the stator core laminated body 70. This makes it possible to quickly and easily divide the stator core laminated body 70 into the plurality of divided cores 32.
In addition, when the force of the vertical component is applied to a plurality of portions in the circumferential direction of the stator core laminated body 70, the force of the vertical component is preferably applied to the outer circumferential side of the stator core laminated body 70, of the plurality of divided iron core piece molding portions 41 that are separated from each other, among the plurality of divided iron core piece molding portions 41 that are annularly arranged in the circumferential direction in the stator core laminated body 70. This enables the stator core laminated body 70 to be efficiently divided into the plurality of divided cores 32. The divided iron core piece molding portions 41 separated from each other refer to the divided iron core piece molding portions 41 which are not adjacent in the circumferential direction.
In the present embodiment, the pin 111 of the external force applying unit 110 is positioned to face the central portion of the stator core laminated body 70 in the lamination direction. Thus, the pin 111 can apply the force of the above-described vertical component to the central portion of the stator core laminated body 70 in the lamination direction. This enables the stator core laminated body 70 to be efficiently divided into the plurality of divided cores 32.
The pin 111 of the external force applying unit 110 applies a force having the above-described vertical component to the outer peripheral side of the stator core laminated body 70 to the portion between the teeth 33b adjacent in the circumferential direction in the stator core laminated body 70. This enables the stator core laminated body 70 to be efficiently divided into the plurality of divided cores 32.
In the present embodiment, the pin 111 of the external force applying portion 110 applies the force of the above-described vertical component to the outer peripheral side of the stator core laminated body 70 to the boundary portion (divided portion 44) of the plurality of divided core segment molding portions 41 arranged annularly in the circumferential direction in the stator core laminated body 70. This enables the stator core laminated body 70 to be more efficiently divided into the plurality of divided cores 32.
As described above, the step of dividing the stator core laminated body 70 into the plurality of divided cores 32 by applying a force having a component in the direction perpendicular to the laminating direction of the formed steel plates 50 to the outer peripheral side of the stator core laminated body 70 corresponds to the dividing step (step S7 in fig. 3).
With the structure of the present embodiment, the stator core laminated body 70 obtained by laminating the formed steel plates 50 press-formed into the shape of the divided core pieces 33 by the push-back process in the thickness direction can be easily divided into the plurality of divided cores 32 each having the teeth 31 b. Further, by applying a force of a component in a direction perpendicular to the lamination direction of the formed steel plates 50 to the outer peripheral side of the stator core laminated body 70, the steel plates constituting the stator core laminated body 70 can be suppressed from peeling.
(other embodiments)
The embodiments of the present invention have been described above, but the above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above embodiment, and can be implemented by appropriately modifying the above embodiment without departing from the scope of the present invention.
In the above embodiment, when the stator core laminated body 70 is divided into the plurality of divided cores 32, a force having a component in a direction perpendicular to the lamination direction of the stator core laminated body 70 is applied to a plurality of locations on the outer peripheral side of the stator core laminated body 70. However, the force having the above-described vertical component may be applied to one portion on the outer peripheral side of the laminated body of the stator core. The force of the vertical component may be applied to a predetermined range of the lamination direction on the outer peripheral side of the stator core lamination body. By applying a force to a predetermined range in the lamination direction of the stator core laminated body in this manner, the stator core laminated body can be more efficiently divided into the plurality of divided cores 32.
In the above embodiment, when the stator core laminated body 70 is divided into the plurality of divided cores 32, the force of the above-described perpendicular component is applied to the outer peripheral side of the stator core laminated body 70 to the plurality of divided iron core piece molding portions 41 that are separated from each other among the plurality of divided iron core piece molding portions 41 that are annularly arranged in the circumferential direction in the stator core laminated body 70. However, the force of the vertical component may be applied to the outer peripheral side of the stator core laminated body to the divided core segment molding portions 41 adjacent in the circumferential direction in the stator core laminated body.
In the above embodiment, when the stator core laminated body 70 is divided into the plurality of divided cores 32, the force of the above-described vertical component is applied to the central portion of the stator core laminated body 70 in the lamination direction. However, the force of the above-described vertical component may be applied to a portion other than the central portion in the lamination direction of the stator core laminated body 70.
In the above embodiment, when the stator core laminated body 70 is divided into the plurality of divided cores 32, the force of the above-described vertical component is applied to the outer peripheral side of the stator core laminated body 70 to the portions between the teeth 33b adjacent in the circumferential direction in the stator core laminated body 70. In the above embodiment, the force of the vertical component is applied to the outer peripheral side of the stator core laminated body 70 at the boundary portion (divided portion 44) of the plurality of divided core piece molding portions 41 annularly arranged in the circumferential direction in the stator core laminated body 70. However, if the stator core laminated body 70 can be divided into the plurality of divided cores 32, the force of the above-described vertical component may be applied to any position on the outer peripheral side of the stator core laminated body 70.
In the above embodiment, in the machining step, the formed steel sheet laminated body 60 is cut at the cutting position X to obtain the stator core laminated body 70. However, the steel plates constituting the laminated stator core may be formed by a push-back process. Thus, in the method for manufacturing the stator core, the machining process can be omitted.
In the above embodiment, the motor is a so-called permanent magnet motor. In a permanent magnet motor, a rotor has a magnet. However, the motor 1 may be a motor without a magnet, such as an inductor, a variable reluctance motor, a switching variable reluctance motor, or a winding excitation type motor.
In the above embodiment, the method for manufacturing the stator core 31 of the motor 1 is described, but the method is not limited thereto, and the method of the above embodiment can be applied to the case of manufacturing a structure having a laminated body of steel plates.
That is, the manufacturing method of the above-described embodiment may be applied to a manufacturing method of a laminated member in which a plurality of plate-shaped divided pieces are annularly laminated around a central axis. The method for manufacturing a laminated member includes the steps of: a push-back step of forming a formed steel plate in which a plurality of segment forming portions forming the segment pieces are arranged in a ring shape by a push-back process of punching out a part of the steel plate in a thickness direction in accordance with the shape of the segment piece and then returning the punched-out part to an original position of the steel plate; a laminate forming step of laminating the formed steel sheets in a thickness direction to obtain a cylindrical laminate; and a dividing step of dividing the laminated body into the plurality of divided portions by applying a force of a component in a direction perpendicular to the lamination direction of the steel sheets to an outer peripheral side of the laminated body.
The divided pieces correspond to the divided core pieces 33 in the above embodiment, and the divided portions correspond to the divided cores 32 in the above embodiment. The laminated member corresponds to the stator core 31 in the above embodiment, and the segment molding portion corresponds to the segment core molding portion 41 in the above embodiment.
Industrial applicability
The present invention is applicable to a method for manufacturing a stator core of a split core in which a plurality of plate-shaped split core pieces are annularly stacked around a central axis.
Description of the reference symbols
1: a motor; 2: a rotor; 3: a stator; 31: a stator core; 31 a: a yoke; 31 b: teeth; 32: dividing the iron core; 32 a: dividing a yoke part; 33: cutting the iron chip; 33 a: dividing the yoke piece; 33 b: a tooth sheet; 33 c: a crimping part; 40: electromagnetic steel sheets (steel sheets); 40 a: a central bore; 40 b: a groove; 40 c: a through hole; 41: a split iron chip molding section; 41 a: a split yoke piece forming part; 42: a pushing-out part; 43: a non-pushing-out part; 44: a dividing section; 50: forming a steel plate; 60: forming a steel plate laminated body; 70: a stator core laminated body (laminated body); 100: a stator core dividing device (stator core manufacturing device); 101: a holding section; 110: an external force applying section; p: a central axis; w1: 1, a tool; w2: a 2 nd tool; x: a cutting position.
Claims (10)
1. A method for manufacturing a stator core in which a plurality of plate-like divided core pieces are laminated, wherein a divided core is annularly arranged around a central axis,
the stator core manufacturing method comprises the following steps:
a push-back step of forming a formed steel plate in which a plurality of split core piece forming portions as the split core pieces are arranged in a ring shape by a push-back process of punching out a part of the steel plate in an axial direction of the central axis line in accordance with a shape of the split core pieces and then returning the punched split core pieces to original positions of the steel plate;
a laminate forming step of axially laminating the formed steel sheets to obtain a cylindrical laminate; and
and a dividing step of dividing the laminated body into a plurality of the divided cores by applying a force of a component in a vertical direction perpendicular to a lamination direction of the formed steel plates to an outer peripheral side of the laminated body.
2. The stator core manufacturing method according to claim 1,
in the dividing step, the force of the vertical component is applied to a plurality of portions of the laminated body on the outer peripheral side of the laminated body in the circumferential direction, and the laminated body is divided into the plurality of divided cores.
3. The stator core manufacturing method according to claim 2,
in the dividing step, the force of the perpendicular component is applied to the outer peripheral side of the laminated body to the plurality of divided iron core piece molding portions separated from each other among the plurality of divided iron core piece molding portions arranged annularly in the circumferential direction in the laminated body, thereby dividing the laminated body into the plurality of divided cores.
4. The stator core manufacturing method according to any one of claims 1 to 3,
in the dividing step, the force of the perpendicular component is applied to a predetermined range in the stacking direction on the outer peripheral side of the stacked body, and the stacked body is divided into the plurality of divided cores.
5. The stator core manufacturing method according to any one of claims 1 to 3,
in the dividing step, the force of the vertical component is applied to the central portion of the laminated body in the laminating direction on the outer peripheral side thereof, thereby dividing the laminated body into the plurality of divided cores.
6. The stator core manufacturing method according to any one of claims 1 to 3,
the split cores have split yoke portions extending in a circumferential direction and tooth portions extending in a radial direction from the split yoke portions,
in the push-back step, a split yoke piece as the split yoke portion and a tooth piece as the tooth portion are formed on the formed steel plate by the push-back process,
in the dividing step, the laminated body is divided into the plurality of divided cores by applying the force of the vertical component to the outer peripheral side of the laminated body to the portion between the teeth pieces adjacent in the circumferential direction in the laminated body.
7. The stator core manufacturing method according to any one of claims 1 to 3,
in the dividing step, the force of the vertical component is applied to the boundary portion of the plurality of divided iron core piece molding portions arranged annularly in the circumferential direction in the laminated body to the outer peripheral side of the laminated body, and the laminated body is divided into the plurality of divided iron cores.
8. A motor, wherein,
the motor has a stator core manufactured by the stator core manufacturing method of any one of claims 1 to 7.
9. A stator core manufacturing apparatus for realizing the stator core manufacturing method according to any one of claims 1 to 7,
the stator core manufacturing apparatus includes:
a holding section for holding the laminate; and
and an external force applying unit that applies the force of the vertical component to the outer peripheral side of the laminate held by the holding unit.
10. A method of manufacturing a laminated member in which a divided portion formed by laminating a plurality of plate-like divided pieces is annularly arranged around a central axis,
the method for manufacturing the laminated member comprises the following steps:
a push-back step of forming a formed steel plate in which a plurality of segment piece forming portions as the segment pieces are arranged in a ring shape by a push-back process of punching out a part of the steel plate in a thickness direction in accordance with the shape of the segment piece and then returning the punched-out part to an original position of the steel plate;
a laminate forming step of laminating the formed steel sheets in a thickness direction to obtain a cylindrical laminate; and
and a dividing step of dividing the laminated body into a plurality of divided portions by applying a force of a component in a vertical direction perpendicular to a lamination direction of the steel sheets to an outer peripheral side of the laminated body.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017172305 | 2017-09-07 | ||
| JP2017-172305 | 2017-09-07 | ||
| PCT/JP2018/025009 WO2019049486A1 (en) | 2017-09-07 | 2018-07-02 | Stator core manufacturing method, motor provided with stator core manufactured by stator core manufacturing method, stator core manufacturing device, and method for manufacturing stacked member |
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| Publication Number | Publication Date |
|---|---|
| CN111033979A CN111033979A (en) | 2020-04-17 |
| CN111033979B true CN111033979B (en) | 2022-04-08 |
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| CN201880050800.0A Active CN111033979B (en) | 2017-09-07 | 2018-07-02 | Method and apparatus for manufacturing stator core, motor, and method for manufacturing laminated member |
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| Country | Link |
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| JP (1) | JP7047847B2 (en) |
| CN (1) | CN111033979B (en) |
| WO (1) | WO2019049486A1 (en) |
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| CN113631293B (en) * | 2019-03-28 | 2024-03-22 | 日本电产株式会社 | Stator core plate manufacturing method, stator core plate, stator core and mold |
| WO2023182256A1 (en) * | 2022-03-24 | 2023-09-28 | ニデック株式会社 | Stator core manufacturing method, stator core, and motor |
| WO2023182257A1 (en) * | 2022-03-24 | 2023-09-28 | ニデック株式会社 | Stator core manufacturing method, stator core, and motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7595578B2 (en) * | 2005-05-06 | 2009-09-29 | Mistuba Corporation | Motor, rotary electric machine and its stator, and method for manufacturing the stator |
| JP4934402B2 (en) | 2006-10-26 | 2012-05-16 | 黒田精工株式会社 | Armature manufacturing method and progressive mold apparatus |
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2018
- 2018-07-02 CN CN201880050800.0A patent/CN111033979B/en active Active
- 2018-07-02 WO PCT/JP2018/025009 patent/WO2019049486A1/en active Application Filing
- 2018-07-02 JP JP2019540787A patent/JP7047847B2/en active Active
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| JPH02260612A (en) * | 1989-03-31 | 1990-10-23 | Nippon Steel Corp | Laminated iron core |
| JP2000201457A (en) * | 1998-12-30 | 2000-07-18 | Mitsui High Tec Inc | Production of laminated pole core for stator and die used therein |
| CN1545755A (en) * | 2002-01-17 | 2004-11-10 | ��ʽ���������Ƽ� | Production method of amorphous laminate core and amorphous laminate core |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7047847B2 (en) | 2022-04-05 |
| WO2019049486A1 (en) | 2019-03-14 |
| CN111033979A (en) | 2020-04-17 |
| JPWO2019049486A1 (en) | 2020-10-15 |
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