CN117318407A - Method for manufacturing laminated core, and laminated core - Google Patents

Abstract

A method for manufacturing a laminated core having a laminate body formed by laminating a plurality of annular core plates. The manufacturing method comprises the following steps: a core plate forming step of forming the core plate having an annular yoke portion; a lamination forming step of laminating a plurality of core plates in a state where the yoke portions are arranged in the axial direction, thereby forming a yoke from the yoke portions, and caulking in the axial direction in a state where a plurality of core plates are laminated, thereby forming a plurality of caulking portions on at least one of a radially outer side of the yoke and the yoke; and a welding step of welding portions of the outer peripheral surface of the laminate, which are located radially outward of the plurality of caulking portions, respectively, along the axial direction.

Description

Method for manufacturing laminated core, and laminated core

Technical Field

The present invention relates to a method for manufacturing a laminated core and a laminated core.

Background

A stator laminated core having a laminate in which a plurality of core plates are laminated and a welded portion is known. For example, patent document 1 discloses a laminated stator core including: a laminated body in which a plurality of metal plates are laminated, the laminated body including an annular main body portion and an ear portion protruding radially outward of the main body portion from an outer peripheral surface of the main body portion; at least one first welding part formed on the outer peripheral surface of the ear part; and at least one second welding part formed on the outer peripheral surface of the lug-shaped part.

In the patent document 1, the first welded portion is partially located on a first virtual line along a lamination direction of the plurality of metal plates, and at least two of the plurality of metal plates are joined in the lamination direction. The second welded portion is partially located on a second virtual line different from the first virtual line along the stacking direction, and joins at least two metal plates among the plurality of metal plates in the stacking direction.

[ Prior Art literature ]

[ patent literature ]

Patent document 1: japanese patent No. 6495092

Disclosure of Invention

The stacked core plates stacked in the thickness direction are riveted to obtain a stacked body. However, in the case of caulking a plurality of stacked core plates, the caulking portion of the core plates may be deformed in the thickness direction. When the core plate is deformed in the thickness direction, the length of the laminated core formed using the laminated body in the axial direction varies depending on the circumferential position of the laminated core. Therefore, a method for manufacturing the laminated core is required in which the variation in the axial length of the laminated core due to the circumferential position is small.

The purpose of the present invention is to realize a method for manufacturing a laminated core, wherein the deviation of the axial length of the laminated core due to the circumferential position is small.

A method for manufacturing a laminated core according to an exemplary embodiment of the present invention is a method for manufacturing a laminated core having a laminated body formed by laminating a plurality of annular core plates, the method including: a core plate forming step of forming the core plate having an annular yoke portion; a lamination forming step of laminating a plurality of core plates in a state where the yoke portions are arranged in the axial direction, thereby forming a yoke from the yoke portions, and caulking in the axial direction in a state where a plurality of core plates are laminated, thereby forming a plurality of caulking portions on at least one of a radially outer side of the yoke and the yoke; and a welding step of welding portions of the outer peripheral surface of the laminate, which are located radially outward of the plurality of caulking portions, respectively, in the axial direction.

In addition, the laminated core according to an exemplary embodiment of the present invention includes: a laminated body in which a plurality of annular core plates are laminated in the thickness direction; and a welded portion located on an outer peripheral surface of the laminated body and connecting the core plates in an axial direction of the laminated body. The core plate has an annular yoke portion. The laminated body has a plurality of yokes each including the yoke portions arranged in the axial direction and caulking portions for connecting the plurality of core plates laminated in the thickness direction in the axial direction. The plurality of caulking portions are located on at least one of a radially outer side of the yoke portion and the yoke. The weld portion is located radially outward of the plurality of caulking portions and extends in the axial direction on an outer peripheral surface of the laminated body.

According to the method for manufacturing a laminated core and the laminated core of an exemplary embodiment of the present invention, a laminated core with little variation in the axial length of the laminated core due to the circumferential position can be obtained.

Drawings

Fig. 1 is a diagram showing an example of a motor according to an embodiment.

Fig. 2 is a diagram showing an example of a laminated core according to the embodiment.

Fig. 3 is a diagram showing an example of a laminated core according to the embodiment.

Fig. 4 is a diagram showing an example of the core plate of the embodiment.

Fig. 5 is a diagram showing an example of the connection portion according to the embodiment.

Fig. 6 is a view of the laminated core of the embodiment as viewed from the axial direction.

Fig. 7 is a flowchart showing an example of a method for manufacturing a laminated core according to the embodiment.

Fig. 8 is a diagram showing an example of the pressure welding apparatus according to the embodiment.

Fig. 9 is a diagram showing an example of the pressure welding apparatus according to the embodiment.

Fig. 10 is a diagram showing an example of the pressure welding apparatus according to the embodiment.

(symbol description)

1, a motor; 1a housing; 2, a rotor; a 21-axis; 22 rotor cores; a 23 magnet; 3, a stator; 31 stator coils; 4 stacking cores; 5 a laminate; 51 yoke; 52 teeth; 53 ear; 53a protruding end portion; 54 slots; 55 bolt insertion holes; 6, core plate; 61 yoke portions; 62 tooth portions; 63 protrusions; 64 groove parts; a 65 through hole; 66 ear connection; 67 a body connection; 68 a protruding part for caulking; 69 recesses for caulking; 71 ear caulking parts (caulking parts); 72 a main body caulking portion (caulking portion); 8, welding parts; 9, a pressurizing welding device; 91 a workbench; 92 pressing part; 93 an irradiation unit; 93a laser irradiation section; 94 misalignment restraining pins; 95 moving part; 96 sliding parts; 97 contact pressing portion; 98 positioning parts; 98a positioning portion through hole; 99 axial moving part; 910 a circumferential movement portion; a P1 central axis; p2 center point.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same or corresponding portions in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. The dimensions of the constituent members in each drawing do not faithfully show the actual dimensions of the constituent members, the ratio of the dimensions of the constituent members, and the like.

In the following description, a direction parallel to the central axis P1 of the laminated body 5 and the laminated core 4 is referred to as an "axial direction", a direction orthogonal to the central axis P1 is referred to as a "radial direction", and a direction along an arc centered on the central axis P1 is referred to as a "circumferential direction". In the circumferential direction, a clockwise direction when the constituent member is viewed from a predetermined direction is referred to as "one circumferential direction", and a counterclockwise direction is referred to as "the other circumferential direction". However, the orientation of the laminated core 4 according to the present invention in use is not intended to be limited by the definition of the direction.

In the following description, "radial" and "circumferential" of the core plate 6 refer to radial and circumferential directions centered on the center point P2 of the center hole located at the center of the core plate 6.

In the following description, the expressions "fixed", "connected" and "attached" include not only the case where the components are directly fixed to each other but also the case where the components are fixed via other components. That is, in the following description, the expression of fixing or the like includes the meaning of direct and indirect fixing or the like of the members to each other.

(Structure of Motor 1)

Fig. 1 is a diagram showing an example of a motor 1 according to the embodiment. As shown in fig. 1, a motor 1 includes a housing 1a, a rotor 2, and a stator 3. The rotor 2 rotates around the central axis P1 with respect to the stator 3. The motor 1 is a so-called inner rotor type motor in which a rotor 2 is rotatably disposed in a cylindrical stator 3 around a central axis P1.

The rotor 2 includes a shaft 21, a rotor core 22, and a magnet 23. The rotor 2 is located radially inward of the stator 3 and is rotatable relative to the stator 3. The rotor core 22 is formed in a cylindrical shape and extends along the central axis P1.

The shaft 21 extending along the central axis P1 is fixed to the rotor core 22 in a state of penetrating the rotor core 22 in the axial direction. Thereby, the rotor core 22 rotates together with the shaft 21. Further, on the outer peripheral surface of the rotor core 22, a plurality of magnets 23 are arranged at predetermined intervals in the circumferential direction.

The stator 3 is housed in the housing 1 a. The stator 3 is cylindrical and is located radially outside the rotor 2. The stator 3 includes a laminated core 4 and a stator coil 31. The laminated core 4 is cylindrical and extends in the axial direction.

(laminated core 4)

An example of the laminated core 4 according to the embodiment will be described with reference to fig. 2 to 4. Fig. 2 and 3 show an example of the laminated core 4 according to the present embodiment. Fig. 4 shows an example of the core plate 6 of the embodiment.

As shown in fig. 2 and 3, the laminated core 4 includes a plurality of laminated bodies 5 laminated in the axial direction. The laminated core 4 is formed by welding the outer peripheral surfaces of the laminated plural laminated bodies 5 in the axial direction. The laminated body 5 constituting the laminated core 4 is constituted by laminating a plurality of core plates 6 formed in a predetermined shape in the thickness direction.

As shown in fig. 2, the laminated body 5 has a yoke 51, a plurality of teeth 52, and a plurality of ears 53. The laminate 5 of the present embodiment has four ears 53. The number of the ears 53 included in the laminate 5 is not limited to four, and may be one or more, three or less, or more than four.

The yoke 51 has a ring shape. When the laminated body 5 is viewed in the axial direction, the teeth 52 extend radially inward from the yoke 51. The teeth 52 are circumferentially aligned. The laminated body 5 has slots 54 between circumferentially adjacent teeth 52 for accommodating a part of the stator coil 31.

The ear portion 53 extends radially outward from the yoke 51. The lugs 53 are arranged at equal intervals in the circumferential direction when the laminated body 5 is viewed in the axial direction. Each of the ears 53 has a bolt insertion hole 55 penetrating in the axial direction. As shown in fig. 3, the plurality of stacked bodies 5 are stacked in a state in which the ears 53 are aligned in the axial direction. In this way, the positions of the ears 53 of the laminated body 5 are aligned when the laminated core 4 is viewed in the axial direction. When the laminated core 4 is viewed in the axial direction, the ear portion 53 of the laminated body 5 overlaps at least a part of the ear portion 53 of the laminated body 5 located on the axial side with respect to the laminated body 5, but may not be completely coincident.

The core plate 6 is formed by blanking an electromagnetic steel plate. As shown in fig. 4, the core plate 6 has a yoke portion 61, a plurality of tooth portions 62, and a plurality of protruding portions 63.

The yoke portion 61 is annular. The yoke 51 of the laminated body 5 is constituted by laminating a plurality of core plates 6 in a state in which the yoke portions 61 are aligned in the axial direction.

The tooth portion 62 extends radially inward from the yoke portion 61. The core plate 6 has a plurality of teeth 62. The plurality of core plates 6 are stacked in a state where the teeth 62 are aligned in the axial direction, thereby constituting the teeth 52 of the stacked body 5.

The core plate 6 has grooves 64 between the teeth 62 adjacent to each other in the circumferential direction, which receive a part of the stator coil 31. By stacking a plurality of core plates 6, the groove portions 64 constitute the slot holes 54 of the stacked body 5.

The protruding portion 63 protrudes radially outward from the yoke portion 61. As shown in fig. 4, the core plate 6 has a plurality of projections 63. The protruding portions 63 are arranged at equal intervals in the circumferential direction on the core plate 6. The plurality of core plates 6 are stacked in a state where the plurality of protruding portions 63 are arranged in the axial direction, respectively, to thereby constitute the ear portions 53 of the stacked body 5.

The protruding portion 63 has a through hole 65 penetrating in the axial direction. The plurality of core plates 6 are stacked in a state where the through holes 65 are aligned in the axial direction, whereby the through holes 65 constitute the bolt insertion holes 55. Bolts for fixing the laminated core 4 to the housing 1a are inserted into the bolt insertion holes 55.

(rivet joint)

An example of the caulking portion according to the embodiment will be described with reference to fig. 4 and 5. Fig. 5 is a diagram showing an example of the connection portion formed in the core plate 6.

As shown in fig. 4, each core plate 6 includes an ear connection portion 66 and a body connection portion 67. The ear connection portion 66 is located radially inward of the protruding portion 63 in the yoke portion 61. The body connecting portion 67 is located between the protruding portions 63 adjacent in the circumferential direction in the yoke portion 61.

As shown in fig. 5, the ear connection portion 66 and the body connection portion 67 have a caulking convex portion 68 and a caulking concave portion 69, respectively. The caulking convex portion 68 is formed by pushing the core plate 6 out from the other axial side toward one side. Further, a caulking concave portion 69 is formed on the other side in the axial direction with respect to the caulking convex portion 68 in the core plate 6.

When a plurality of core plates 6 are stacked in the thickness direction, the caulking convex portions 68 of the ear connection portions 66 of the core plates 6 are fitted into the caulking concave portions 69 of the ear connection portions 66 of the core plates 6 located on one side in the axial direction with respect to the core plates 6. The portion where the ear connection portions 66 of the plurality of laminated core plates 6 are axially caulking is an ear caulking portion 71. The ear caulking portion 71 is located radially inward of each ear 53 in the yoke 51.

When a plurality of core plates 6 are stacked in the thickness direction, the caulking convex portions 68 of the main body connection portions 67 of the core plates 6 are fitted into the caulking concave portions 69 of the main body connection portions 67 of the core plates 6 located on one side in the axial direction with respect to the core plates 6. The portion where the body connection portions 67 of the plurality of laminated core plates 6 are riveted in the axial direction is the body connection portion 67. The body caulking portion 72 is located on the yoke 51 of the laminated body 5. The body caulking portion 72 is located radially outward of the radial center of the yoke 51.

Thus, the laminate 5 includes the ear caulking portion 71 and the body caulking portion 72 as caulking portions. As shown in fig. 3, a plurality of caulking portions including ear caulking portions 71 and body caulking portions 72 are formed at equal intervals in the circumferential direction of the laminated body 5. When the laminated body 5 is viewed from the axial direction, the ear caulking portions 71 and the body caulking portions 72 are alternately arranged in the circumferential direction.

(weld 8)

Next, an example of the welded portion 8 of the laminated core 4 according to the embodiment will be described with reference to fig. 3 and 6. Fig. 6 is a view of the laminated core 4 as seen from the axial direction.

The laminated core 4 has a plurality of welded portions 8. The welded portion 8 is located on the outer peripheral surface of the laminated body 5 laminated in the axial direction, and connects the core plates 6 in the axial direction. That is, the welded portion 8 is a portion of the outer peripheral surface of the laminated body 5 that is welded in the axial direction. As shown in fig. 3, each welded portion 8 extends from one end to the other end in the axial direction of the laminated core 4.

Specifically, the welded portion 8 is located on the outer peripheral surface of the ear portion 53 out of the outer peripheral surfaces of the laminated core 4. The open arrow in fig. 6 shows the position of the weld 8. As shown in fig. 6, when the laminated core 4 is viewed from the axial direction, the laminated core 4 has the welded portion 8 on the outer peripheral surface on the side of the radially outermost protruding end portion 53a in the outer peripheral surface of the ear portion 53 in the circumferential direction, among all the ear portions 53.

As shown in fig. 3 and 6, the laminated core 4 also has a welded portion 8 at a portion of the outer peripheral surface located radially outward of the plurality of body caulking portions 72. That is, the laminated core 4 also has the welded portion 8 on the outer peripheral surface of the yoke 51.

(method for producing laminated core 4)

Next, a method for manufacturing the laminated core 4 according to the embodiment will be described in detail with reference to fig. 7 to 10. Fig. 7 is a diagram showing an example of a method for manufacturing the laminated core 4 according to the embodiment. Fig. 8 to 10 are diagrams showing an example of the pressure welding apparatus 9 according to the embodiment.

First, the core plate 6 is cut out from the electromagnetic steel plate. Thus, the step of forming the core plate 6 by cutting out the electromagnetic steel sheet is the core plate forming step of step S1 shown in fig. 7.

For example, a press working apparatus, not shown, forms the ear connection portion 66 and the body connection portion 67 using a die for the core plate 6, and forms the core plate 6 having the annular yoke portion 61, the protruding portion 63 protruding radially outward from the yoke portion 61, and the tooth portion 62.

Next, a predetermined number of core plates 6 are stacked in the thickness direction to form a stacked body 5. The step of laminating the plurality of core plates 6 thus formed in the core plate forming step to form the laminate 5 is a laminate forming step of step S2 shown in fig. 7.

In the lamination forming step, the plurality of core plates 6 are laminated in a state where the protruding portions 63 are aligned in the axial direction, whereby the protruding portions 63 constitute the ear portions 53. Specifically, the plurality of core plates 6 are stacked in a state where the plurality of protruding portions 63 are arranged in the axial direction, whereby the plurality of ears 53 are arranged at equal intervals in the circumferential direction.

In the lamination forming step, the yoke 51 is configured by laminating the plurality of core plates 6 in a state where the yoke portions 61 are aligned in the axial direction. Further, in the lamination forming step, the caulking convex portion 68 of the core plate 6 is fitted into the caulking concave portion 69 of the core plate 6 located on one side in the axial direction with respect to the core plate 6.

When lamination of the core plates 6 of a prescribed number is completed, the plurality of laminated core plates 6 are riveted. For example, the plurality of core plates 6 are riveted by pressurizing the plurality of laminated core plates 6 in the axial direction. As a result, a laminated body 5 in which a plurality of core plates 6 are connected in the thickness direction is formed.

As a result of caulking in the axial direction in a state where the plurality of core plates 6 are stacked, an ear caulking portion 71 is formed in the yoke 51 radially inward of each ear portion 53. In this way, the ear caulking portion 71 is a portion for caulking the ear connecting portion 66, and is located radially inward of the ear portion 53. In addition, by forming the ear connecting portion 66 to the protruding portion 63, the ear caulking portion 71 may be formed to the ear portion 53.

Further, the body connecting portions 67 of the respective core plates 6 are caulking-connected in the axial direction, whereby the body caulking portions 72 are formed in the yoke 51. Thus, the body caulking portion 72 is a portion where the body connecting portion 67 is caulking, and is located between the ear caulking portions 71 adjacent in the circumferential direction.

In this way, in the lamination forming step, by caulking in the axial direction in a state where the plurality of core plates 6 are laminated, a plurality of caulking portions are formed in at least one of the ear portions 53 and the yoke 51 located radially outward of the yoke 51. The plurality of caulking portions include an ear caulking portion 71 and a body caulking portion 72.

The plurality of caulking portions are formed at equal intervals in the circumferential direction of the laminate 5. Specifically, the ear caulking portions 71 and the body caulking portions 72 are alternately formed in the circumferential direction of the laminated body 5. The number of ear caulking portions 71 formed on the laminate 5 is the same as the number of body caulking portions 72.

In addition, only one of the ear caulking portion 71 and the body caulking portion 72 may be formed in the laminate 5 instead of the other. That is, in the laminate forming step, only at least one of the ear caulking portion 71 and the body caulking portion 72 may be formed as the caulking portion on the core plate 6 in which a plurality of core plates are laminated.

Next, the plurality of laminated bodies 5 are laminated in a state where the ear portions 53 are aligned in the axial direction. Then, in a state where the stacked plurality of stacked bodies 5 are pressurized in the axial direction, the outer peripheral surfaces of the lugs 53 and the portions located radially outward of the body caulking portions 72 among the outer peripheral surfaces of the plurality of stacked bodies 5 are welded in the axial direction. In this way, the step of welding the portions of the outer peripheral surface of the laminate 5, which are located radially outward of the plurality of caulking portions including the ear caulking portion 71 and the body caulking portion 72, in the axial direction is the welding step of step S3 shown in fig. 7.

For example, a plurality of laminated bodies 5 are laminated in the axial direction using a robot arm not shown. The stacked body 5 may be stacked in a plurality by a mechanism other than a robot arm. When the laminated body 5 is viewed from the axial direction, the laminated body 5 is laminated in a state rotated by 90 degrees in the clockwise direction or the counterclockwise direction with respect to the adjacent laminated body 5.

Specifically, the laminated body 5 is formed by laminating a plurality of the ear portions 53 in a state of being aligned in the axial direction. In addition, a plurality of laminated bodies 5 are laminated in a state in which the yokes 51 are aligned in the axial direction. The stacked body 5 is formed by stacking a plurality of ear-caulking portions 71 in an axially aligned state. The stacked body 5 is formed by stacking a plurality of body caulking portions 72 in an axially aligned state.

When lamination of a predetermined number of laminated bodies 5 is completed, the outer peripheral surfaces of the laminated bodies 5 are welded in the axial direction. In the method of manufacturing the laminated core 4 of the present embodiment, the outer peripheral surfaces of the respective lugs 53 in the outer peripheral surfaces of the plurality of laminated layers 5 are welded in the axial direction. In the welding step, when the stacked plurality of stacked bodies 5 are viewed in the axial direction, one or the other circumferential side portions are welded to the protruding end portions 53a located on the outermost side in the radial direction of the ear portions 53, out of the outer circumferential surfaces of the plurality of ear portions 53.

Fig. 6 shows an example in which, when the laminated body 5 is viewed from the axial direction, one side portion in the circumferential direction is welded to the protruding end portion 53a located at the outermost side in the radial direction in the outer peripheral surface of the ear portion 53, among all the ear portions 53.

Further, a portion of the outer peripheral surface of the laminated body 5 located radially outward of the axially aligned main body caulking portions 72 is welded in the axial direction.

Fig. 8 and 9 are diagrams showing an example of the pressure welding apparatus 9 for welding the laminate 5. The pressure welding apparatus 9 includes a table 91, a pressing portion 92, and a plurality of irradiation units 93. In fig. 8 and 9, the irradiation unit 93 is not shown.

The plurality of laminated bodies 5 are laminated on the plane of the table 91 of the pressure welding apparatus 9 by the robot arm.

The table 91 has a plurality of misalignment suppressing pins 94. A plurality of misalignment restraining pins 94 extend in the axial direction. As shown by broken lines in fig. 8, the misalignment suppressing pins 94 are inserted into the bolt insertion holes 55 of the ears 53 of the laminated body 5, respectively. This can suppress the misalignment of the plurality of stacked bodies 5 mounted on the table 91 in the radial direction.

The pressing portion 92 axially presses the stacked body 5 in which a plurality of stacked bodies are stacked on the mounting table of the table 91. In the example of fig. 8 and 9, the pressing portion 92 presses the stacked body 5 in which a plurality of stacked bodies are stacked from above to below. The pressing portion 92 includes a pressing motor, not shown, a moving portion 95, a sliding portion 96, a contact pressing portion 97, and a positioning portion 98.

Next, the operation of the pressure welding apparatus 9 will be described. When pressurizing, the pressurizing motor rotates, and the moving part 95 moves downward. Fig. 9 shows an example of a state in which the moving unit 95 moves downward. The sliding portion 96 slides downward by the load applied by the moving portion 95. The contact pressing portion 97 is plate-shaped and is located on the lower surface side of the sliding portion 96. The contact pressing portion 97 faces the stacked body 5 in which a plurality of the contact pressing portions are stacked.

The positioning portion 98 moves in the axial direction with the movement of the moving portion 95. Specifically, the slide portion 96 and the contact pressing portion 97 have a positioning portion through hole 98a through which the positioning portion 98 passes in the axial direction. When the moving portion 95 moves for pressurization, the positioning portion 98 is inserted into the inside of the stacked body 5 in which a plurality of stacked bodies are stacked. This can suppress the displacement of the plurality of stacked laminate 5 in the radial direction before the pressure welding.

The moving portion 95 moves toward the laminated body 5, and the contact pressing portion 97 contacts an end surface in the axial direction of the laminated body 5 located uppermost in the laminated body 5 in which the plurality of laminated bodies are laminated. Thereby, the laminated body 5 in which a plurality of laminated bodies are pressed. When the load on the stacked laminate 5 reaches a predetermined value, the moving unit 95 stops. In this way, the plurality of stacked laminated bodies 5 are pressurized in the axial direction.

As shown in fig. 10, the pressure welding apparatus 9 includes a plurality of irradiation units 93, an axial moving portion 99, and a circumferential moving portion 910. As shown in fig. 10, when the laminated body 5 is viewed from the axial direction, the irradiation units 93 are opposed to each other with the laminated body 5 interposed therebetween in the direction perpendicular to the axial direction. The pressure welding apparatus 9 of the present embodiment has two irradiation units 93. The irradiation unit 93 of the pressure welding apparatus 9 may be one or three or more.

As shown in fig. 10, each irradiation unit 93 includes a plurality of laser irradiation sections 93a. The irradiation unit 93 of the present embodiment has two laser irradiation sections 93a. The number of the laser irradiation units 93a of the irradiation unit 93 may be one or three or more.

The laser irradiation units 93a irradiate laser beams, respectively. The outer peripheral surface of the laminate 5 can be welded by irradiation with laser light. When the laminated body 5 is viewed in the axial direction, the optical axes of the plurality of laser light irradiation portions 93a included in one irradiation unit 93 are parallel.

Since one irradiation unit 93 includes a plurality of laser irradiation portions 93a, a plurality of portions can be welded simultaneously to the outer peripheral surface of the laminate 5. As shown in fig. 10, the irradiation unit 93 can weld the outer peripheral surface of the ear 53 and the outer peripheral surface of the yoke 51 at the same time.

Further, the plurality of irradiation units 93 can simultaneously irradiate the laser light, respectively. Thus, when the stacked plurality of stacked bodies 5 are viewed in the axial direction, the plurality of irradiation units 93 can simultaneously weld the outer peripheral surfaces of at least a part of the ears 53 among the plurality of ears 53. Fig. 10 shows an example in which a plurality of irradiation units 93 simultaneously weld the ear portions 53 facing each other with the central axis P1 therebetween when the laminated body 5 is viewed in the axial direction.

The plurality of irradiation units 93 can weld a plurality of portions of the yoke 51 simultaneously while welding any of the ears 53.

As shown in fig. 6 and 10, when the laminated body 5 is viewed in the axial direction, the laser irradiation units 93a irradiate the outer peripheral surface of the laminated body 5 with laser light from the normal direction of the outer peripheral surface. This can provide an advantage that the focal point can be easily aligned with the welded portion and the irradiation area can be easily ensured. Therefore, the outer peripheral surface of the laminate 5 can be efficiently welded.

The axial moving portion 99 moves each irradiation unit 93 in the axial direction. By moving the irradiation unit 93 in the axial direction, the outer peripheral surface of the laminated body 5 can be welded in the axial direction in a state where the laminated body 5 in which a plurality of laminated bodies are laminated is pressurized in the axial direction. Thereby, the welded portion 8 connecting the core plates 6 in the axial direction of the laminated body 5 is formed.

Specifically, in the welding step, the outer peripheral surface is welded in the axial direction from one end to the other end in the axial direction of the laminated body 5 in which a plurality of laminated bodies are laminated. Thereby, the laminated core 4 in which the plurality of laminated bodies 5 are connected in the axial direction is formed.

The circumferential movement portion 910 moves each irradiation unit 93 in the circumferential direction. When the welding from one end to the other end in the axial direction of the stacked body 5 in which a plurality of stacked bodies are stacked is completed, the circumferential moving portion 910 can move the irradiation unit 93 along the outer peripheral surface of the stacked body 5, and move the irradiation unit 93 to the next welding position. For example, as shown by solid lines and broken lines in fig. 10, when the laminated body 5 is viewed from the axial direction, the circumferential moving section 910 can move the plurality of irradiation units 93 in the circumferential direction by 90 degrees centering around the central axis P1. In this way, the pressure welding apparatus 9 can move the irradiation position of the laser light in the circumferential direction by moving the plurality of irradiation units 93 in the circumferential direction.

When all the welded portions 8 are formed, the moving portion 95 moves upward, and the pressing of the laminated core 4 is released.

As described above, the method for manufacturing the laminated core 4 according to the embodiment can have the following features.

(1) A method for manufacturing a laminated core 4, wherein the laminated core 4 has a laminated body 5 formed by laminating a plurality of annular core plates 6, the method comprising: a core plate forming step of forming the core plate 6 having an annular yoke portion 61; a laminated body forming step of forming a yoke 51 from the yoke portion 61 by laminating a plurality of core plates 6 in a state in which the yoke portion 61 is aligned in the axial direction, and forming a plurality of caulking portions on at least one of the outer side in the radial direction of the yoke 51 and the yoke 51 by caulking in the axial direction in a state in which a plurality of core plates 6 are laminated; and a welding step of welding portions of the outer peripheral surface of the laminate, which are located radially outward of the plurality of caulking portions, respectively, in the axial direction.

The plurality of caulking portions are at least one of the ear caulking portion 71 and the body caulking portion 72. According to this structure, by welding the plurality of caulking portions formed at positions close to the outer peripheral surface of the laminated body 5 to the radially outer side, even when the core plate 6 is deformed at the time of forming the caulking portions, it is possible to suppress the occurrence of a deviation in the axial length of the laminated core 4 due to the circumferential position of the laminated core 4. Therefore, the laminated core 4 with high dimensional accuracy can be manufactured.

(2) In the method for manufacturing the laminated core 4 according to (1), in the step of forming the laminated body, the plurality of caulking portions are formed at equal intervals in the circumferential direction of the laminated body 5.

According to this structure, the radially outer portions of the plurality of caulking portions arranged in the circumferential direction are welded in the axial direction. This can suppress the occurrence of a deviation in the axial length of the laminated core 4 due to the circumferential position of the laminated core 4. The caulking portions are disposed at equal intervals in the circumferential direction. This results in a good balance in the positions of the welded portions of the laminated core 4 in the circumferential direction. Therefore, the laminated core 4 having a good balance in shape and weight in the circumferential direction and less vibration can be manufactured.

(3) In the method for manufacturing the laminated core 4 according to (1) or (2), in the welding step, a plurality of the laminated body 5 are laminated in a state in which the caulking portions are aligned in the axial direction, and a portion of the outer peripheral surface of the laminated body 5 located radially outward of the caulking portions aligned in the axial direction is welded in the axial direction.

According to this structure, the outer peripheral surface of the laminated body 5 is welded while the laminated core 4 is pressurized in the axial direction. This makes it possible to weld the laminated body 5 while pressing the laminated plurality of core plates 6 in the axial direction. Therefore, welding can be performed with the deformation amount of the caulking portion in the axial direction reduced, and the variation in the axial length of the laminated core 4 due to the circumferential position can be suppressed. Therefore, the laminated core 4 with high dimensional accuracy can be manufactured.

(4) In the method for manufacturing the laminated core 4 according to (3), in the welding step, the outer peripheral surfaces of the laminated bodies 5 are welded in the axial direction while the laminated bodies 5 are pressed in the axial direction.

According to this structure, the outer peripheral surfaces of the laminated bodies 5 are welded while the plurality of laminated bodies 5 are pressurized in the axial direction. This makes it possible to weld the laminated body 5 while pressing the laminated plurality of core plates 6 in the axial direction. Therefore, welding can be performed with the deformation amount of the caulking portion in the axial direction reduced, and the variation in the axial length of the laminated core 4 due to the circumferential position can be suppressed. Therefore, the laminated core 4 with high dimensional accuracy can be manufactured.

(5) In the method for manufacturing the laminated core 4 described in (1) to (4), in the core plate forming step, the core plate 6 having the plurality of protruding portions 63 protruding radially outward from the yoke portion 61 is formed, in the laminated body forming step, the plurality of core plates 6 are laminated in a state in which the protruding portions 63 are aligned in the axial direction, the plurality of ear portions 53 are formed by the protruding portions 63, at least one of the ear caulking portions 71 and the body caulking portions 72 is formed as the caulking portions on the core plate 6 in which the plurality of core plates are laminated, the ear caulking portions 71 are located radially inward of the ear portions 53 in the yoke 51 or the ear portions 53, and when the laminated body 5 is viewed in the axial direction, the body caulking portions 72 are located between the ear portions 53 adjacent in the circumferential direction in the laminated body 5, and in the welding step, the portions of the outer peripheral surface of the laminated body located radially outward with respect to the plurality of caulking portions are welded in the axial direction.

According to this structure, the portion of the outer peripheral surface of the laminated body 5 located radially outward of the ear-caulking portion 71 is welded in the axial direction. This can suppress the occurrence of a deviation in the axial length of the laminated core 4 due to the circumferential position of the laminated core 4. Therefore, the laminated core 4 with high dimensional accuracy can be manufactured.

Further, a portion of the outer peripheral surface of the laminated body located radially outward of the body caulking portion 72 is welded in the axial direction. This can suppress the occurrence of a variation in the axial length of the laminated core due to the circumferential position. Therefore, the laminated core 4 with high dimensional accuracy can be manufactured.

(6) In the method for manufacturing the laminated core 4 according to any one of (1) to (5), in the welding step, the outer peripheral surfaces of the lugs 53 are welded from one end to the other end in the axial direction of the laminated body 5 in which a plurality of the lugs are laminated.

According to this structure, the laminated core 4 is welded from one end to the other end in the axial direction. Thereby, deformation of the caulking portion is suppressed from one end to the other end in the axial direction of the laminated core 4.

In addition, the laminated core 4 of the embodiment may have the following features. (7) a laminated core 4 having: a laminated body 5 in which a plurality of annular core plates 6 are laminated in the thickness direction; and a welded portion 8 located on an outer peripheral surface of the laminated body 5 and connected to the core plate 6 in an axial direction of the laminated body 5, wherein the core plate 6 has an annular yoke portion 61, and the laminated body 5 includes: a yoke 51 composed of the yoke portions 61 arranged in the axial direction; and a plurality of caulking portions connected to the plurality of core plates 6 stacked in the thickness direction in the axial direction, the plurality of caulking portions being located radially outward of the yoke 51 or at least one of the yokes 51, the welding portion 8 being located radially outward of the plurality of caulking portions, and extending in the axial direction on the outer peripheral surface of the stacked body 5.

The plurality of caulking portions are at least one of the ear caulking portion 71 and the body caulking portion 72. According to this structure, by welding the portions of the outer peripheral surface of the laminated body 5 located radially outward of the caulking portions in the axial direction, it is possible to suppress the occurrence of a variation in the axial length of the laminated core 4 due to the circumferential position of the laminated core 4. Thus, the laminated core 4 having high dimensional accuracy can be obtained.

(other embodiments)

While the embodiments of the present invention have been described above, the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments within a range not departing from the gist thereof.

In the above embodiment, the lamination body 5 has a plurality of caulking portions formed on at least one of the radially outer side of the yoke 51 and the yoke 51 by caulking in the axial direction in a state where the plurality of core plates 6 are laminated. The plurality of caulking portions include an ear caulking portion 71 located radially inward of the ear portion 53 or the ear portion 53 in the yoke 51. In the outer peripheral surface of the laminate 5, the ear portion 53 located radially outward of the ear caulking portion 71 is welded in the axial direction. However, the welded portion is not limited to the ear portion in the outer peripheral surface of the laminate. For example, the radially outer portion of the caulking portion other than the ear portion in the outer peripheral surface of the laminate may be welded. Further, the outer peripheral surface of the laminate may be welded at a portion other than the radially outer side of the ear portion or the caulking portion.

In the above embodiment, the plurality of caulking portions include the main body caulking portion 72 located in the yoke 51. A portion of the outer peripheral surface of the yoke 51 of the laminated body 5 located radially outward of the body caulking portion 72 is welded in the axial direction. However, a portion other than the radially outer side of the body caulking portion in the outer peripheral surface of the laminated body may be welded.

In the above embodiment, the laminate 5 has both the ear caulking portion 71 and the body caulking portion 72. However, only one of the plurality of ear caulking portions and the main body caulking portion may be formed on the laminate. That is, in the laminate forming step, only one of the plurality of ear caulking portions and the main body caulking portion may be formed as the caulking portion on the plurality of laminated core plates.

In the above embodiment, the outer peripheral surface of the yoke 51 radially outside the ear portion 53 and the body caulking portion 72 is welded to the ear caulking portion 71, out of the outer peripheral surfaces of the laminated body 5. However, the outer peripheral surface of the laminate may be welded to the ear portion located radially outward of the ear-caulking portion, instead of being welded to the radially outward of the body-caulking portion. Further, the outer peripheral surface of the laminate may be welded at a portion radially outside the main body caulking portion, instead of the ear portion.

In the above embodiment, the laminate 5 has the ear caulking portion 71 and the body caulking portion 72. However, the laminate may have a caulking portion other than the ear caulking portion and the main body caulking portion.

In the above embodiment, the plurality of caulking portions are formed at equal intervals in the circumferential direction of the laminated body 5. Specifically, in the above embodiment, the plurality of caulking portions including the ear caulking portion 71 and the body caulking portion 72 are arranged at equal intervals in the circumferential direction of the laminated body 5. However, the circumferential intervals of the adjacent caulking portions may be different.

In the above embodiment, the ear caulking portions 71 and the body caulking portions 72 are alternately formed in the circumferential direction of the laminated body 5. However, the ear caulking portions and the body caulking portions may not be alternately arranged in the circumferential direction. The ear rivet and the ear rivet may be adjacent to each other in the circumferential direction, or the body rivet and the body rivet may be adjacent to each other in the circumferential direction.

In the above embodiment, the number of ear caulking portions 71 formed on the laminate 5 is the same as the number of body caulking portions 72. However, the number of ear-caulking portions and the number of body-caulking portions formed on the laminate may be different.

In the above embodiment, the laminated core 4 is constituted by the plurality of laminated bodies 5 laminated in a state in which the ear portions 53 are arranged in the axial direction. However, the laminate included in the laminate core may be one.

In the above embodiment, the core plate 6 has the plurality of projections 63 arranged at equal intervals in the circumferential direction on the core plate 6. By stacking the plurality of core plates 6 in a state where the protruding portions 63 are aligned in the axial direction, the lugs 53 arranged at equal intervals in the circumferential direction are formed on the stacked body 5. However, the intervals of the projections adjacent in the circumferential direction on the core plate may not be equal intervals. Further, the intervals of the adjacent ears in the circumferential direction may not be equal intervals.

In the above embodiment, one main body connecting portion 67 is located between the protruding portions 63 adjacent in the circumferential direction, as viewed from the axial direction, of the core plate 6. When the laminated body 5 is viewed in the axial direction, one body caulking portion 72 is located between the adjacent ear portions 53 in the circumferential direction of the laminated body 5. However, a plurality of body connection portions may be provided between the protruding portions adjacent in the circumferential direction. In addition, when the laminated body is viewed from the axial direction, a plurality of body caulking portions may be formed between circumferentially adjacent ear portions.

In the above embodiment, the ear caulking portions 71 are located radially inward of all the ears 53 or all the ears 53 in the yoke 51. However, the ear-caulking portion may be located radially inward of a part of the plurality of ears or a part of the yoke.

In the above embodiment, the outer peripheral surface of the ear portion 53 is welded from one end to the other end in the axial direction of the laminated body 5 in which a plurality of the ear portions are laminated. However, only a part of the stacked body from one end to the other end in the axial direction may be welded.

In the above embodiment, the laminate 5 is pressurized using the pressure welding apparatus 9 shown in fig. 8 and 9. However, the laminated body may be pressurized by a structure other than the structures shown in fig. 8 and 9.

In the above embodiment, when the laminated body 5 is viewed from the axial direction, the plurality of irradiation units 93 face each other with the laminated body 5 interposed therebetween in the direction perpendicular to the axial direction. However, the positions of the plurality of irradiation units 93 are not limited to the example shown in fig. 10. For example, when the laminated body 5 is viewed in the axial direction, the plurality of irradiation units 93 may be opposed to each other without sandwiching the laminated body 5.

In the above embodiment, the pressure welding device 9 simultaneously welds a plurality of portions on the outer peripheral surfaces of the laminated plurality of laminated bodies 5. However, the pressure welding apparatus may weld the outer peripheral surfaces of the plurality of laminated bodies at each of the one locations.

In the above embodiment, the plurality of stacked bodies 5 are stacked as viewed in the axial direction, and the plurality of irradiation units 93 simultaneously weld the ear portions 53 facing each other with the central axis P1 interposed therebetween. However, the irradiation unit may be welded to the circumferentially adjacent ear portions.

In the above embodiment, the two lugs 53 and the radially outer sides of the two body caulking portions 72 in the outer peripheral surface of the laminated body 5 are simultaneously welded. However, three or more lugs in the outer peripheral surface of the laminate may be welded at the same time. Further, the radially outer sides of three or more main body caulking portions 72 in the outer peripheral surface of the laminated body may be simultaneously welded.

In the above embodiment, all the ears 53 arranged in the circumferential direction of the laminated body 5 are welded as viewed from the axial direction. However, when the laminate is viewed from the axial direction, only a part of the ears arranged in the circumferential direction may be welded.

In the above embodiment, when the laminated body 5 is viewed from the axial direction, the laser irradiation section 93a irradiates the outer peripheral surface of the laminated body 5 with laser light from the normal direction of the outer peripheral surface. However, the laser irradiation unit may irradiate the outer peripheral surface of the laminate with laser light from a direction other than the normal direction of the outer peripheral surface.

In the above embodiment, the outer peripheral surface of the laminate 5 is welded by irradiation with laser light. However, the outer peripheral surface of the laminate may be welded by a welding method other than laser welding.

The present invention can be used for a method for manufacturing a laminated core and a laminated core.

Claims (7)

1. A method for manufacturing a laminated core having a laminate body formed by laminating a plurality of annular core plates, characterized by comprising:

a core plate forming step of forming the core plate having an annular yoke portion;

a lamination forming step of laminating a plurality of core plates in a state where the yoke portions are arranged in the axial direction, thereby forming a yoke from the yoke portions, and caulking in the axial direction in a state where a plurality of core plates are laminated, thereby forming a plurality of caulking portions on at least one of a radially outer side of the yoke and the yoke; and

and a welding step of welding portions of the outer peripheral surface of the laminate, which are radially outward of the plurality of caulking portions, respectively in the axial direction.

2. The method for producing a laminated core according to claim 1, wherein,

in the laminate forming step, the plurality of caulking portions are formed at equal intervals in the circumferential direction of the laminate.

3. The method for producing a laminated core according to claim 1 or 2, wherein,

in the welding step, a plurality of the laminated bodies are laminated in a state in which the caulking portions are aligned in the axial direction, and a portion of an outer peripheral surface of the laminated body located radially outward of the caulking portions aligned in the axial direction is welded in the axial direction.

4. The method for producing a laminated core according to claim 3, wherein,

in the welding step, outer peripheral surfaces of the laminated bodies are welded in the axial direction while the laminated bodies are pressed in the axial direction.

5. The method for producing a laminated core according to claim 3, wherein,

in the core plate forming step, the core plate having a plurality of protruding portions protruding radially outward from the yoke portion is formed,

in the laminate forming step, a plurality of core plates are laminated with the protruding portions aligned in the axial direction, a plurality of ears are formed by the protruding portions, at least one of an ear caulking portion and a body caulking portion is formed as the caulking portion on the core plates in which the plurality of core plates are laminated,

the ear rivet is located radially inward of the ear portion of the yoke or the ear portion,

when the laminated body is viewed from the axial direction, the main body caulking portion is located between the ears of the laminated body adjacent in the circumferential direction,

in the welding step, a portion of the outer peripheral surface of the laminate, which is radially outward of the plurality of caulking portions, is welded along the axial direction.

6. The method for producing a laminated core according to claim 1 or 2, wherein,

in the welding step, an outer peripheral surface of the laminated core is welded from one end to the other end in the axial direction of the laminated core.

7. A laminated core, comprising: a laminated body in which a plurality of annular core plates are laminated in the thickness direction; and a welding part located on the outer peripheral surface of the laminated body and connecting the core plates in the axial direction of the laminated body, characterized in that,

the core plate has a yoke portion of an annular shape,

the laminated body has a plurality of yokes composed of the yoke portions arranged in the axial direction and caulking portions connecting the plurality of core plates laminated in the thickness direction in the axial direction,

the plurality of caulking portions are located at least one of a radially outer side of the yoke and the yoke,

the weld portion is located radially outward of the plurality of caulking portions and extends in the axial direction on an outer peripheral surface of the laminated body.