Stator core positioning device and stator core manufacturing method

Abstract

A positioning device (1) of a stator core (100) positions a plurality of electromagnetic steel sheets (101) in a cylindrical stator core (100) in which the plurality of electromagnetic steel sheets (101) are stacked in a thickness direction, the electromagnetic steel sheets having a stator core main body portion (101a) in a circular ring shape and a plurality of teeth (103) extending to an inner side in a radial direction at an inner peripheral side of the stator core main body portion (101a), the positioning device (1) of the stator core having an outer side member (7) in contact with end surfaces (103a) of the plurality of teeth (103) on the inner side in the radial direction, an inner side member (8) at a position on the inner side in the radial direction than the outer side member (7), an adjustment portion (9) between the outer side member (7) and the inner side member (8), and a moving mechanism (3) that moves the inner side member (8) in the radial direction, the adjustment portion (9) adjusting a position of the outer side member (7) in the radial direction with respect to the inner side member (8).

Description

Technical Field

[0001] This invention relates to a stator core positioning device and a stator core manufacturing method. Background Technology

[0002] A known method for manufacturing a stator core involves welding a stator core having multiple electromagnetic steel plates stacked along its thickness direction from one axial end to the other. For example, Japanese Patent Application Publication No. 2020-188541 discloses a method for manufacturing a stator core, comprising: a stacking process of bonding multiple electromagnetic steel plates with an adhesive and stacking them; a forming process of punching the stacked electromagnetic steel plates into a shape having the aforementioned pole teeth to form electromagnetic steel plate units; and a welding process of stacking and welding multiple electromagnetic steel plate units together.

[0003] Japanese Patent Application Publication No. 2020-188541 discloses a stator core manufacturing method in which, during the lamination process, an adhesive such as epoxy resin is applied to the bonding surfaces of multiple strip steel plates. The strip steel plates are pressurized from both the surface and back sides by a pair of rollers. This bonds the multiple strip steel plates together and stacks them in a direction orthogonal to their respective surfaces. In the forming process, the stacked strip steel plates are punched into steel plate units corresponding to the stator core with pole teeth. These steel plate units are then stacked in a stamping forming apparatus to form the shape of the stator core. In the welding process, the stator core stacked in the stamping forming machine is welded at the welded parts by a welding device.

[0004] In conventional stator core manufacturing methods, to prevent interference between the stator core and the rotor core, it is necessary to correct the positional misalignment of the electromagnet plates and suppress welding deformation caused by welding. Therefore, the stator core is welded after the electromagnet plates are positioned using a positioning device. The positioning device inserts a cylindrical positioning component into the rotor through-hole of the stator core and positions it. The outer periphery of the positioned stator core is then welded while under pressure along its axial direction.

[0005] Thus, in the stator core manufacturing method, the jig is used to align the radial positions of the stacked electromagnetic steel plates, and pressure is applied to the electromagnetic steel plates along the stacking direction, thereby maintaining the shape of the stator core in an appropriate state. Since the stator core is welded while being radially positioned by the jig, radial deformation caused by welding heat can be suppressed.

[0006] However, the positioning member is cylindrical with an outer diameter smaller than the inner diameter of the stator core. That is, a gap is created between the positioning member inserted into the through-hole of the stator core and the front end face of the pole tooth, which forms the inner circumferential surface of the through-hole. Furthermore, the stator core is formed by stacking layers of stamped electromagnetic steel sheets. Therefore, the deformation of the through-hole of the stator core is greater than the deformation of the positioning member. Consequently, in the positioning device where a positioning member with an outer diameter smaller than the inner diameter of the through-hole of the stator core is inserted, it is impossible to adequately suppress deformation during the positioning and welding of multiple electromagnetic steel sheets. Summary of the Invention

[0007] The purpose of this invention is to provide a stator core positioning device that can position multiple electromagnetic steel plates taking into account the shape and welding position of the electromagnetic steel plates.

[0008] According to one embodiment of the present invention, a stator core positioning device positions multiple electromagnetic steel plates stacked along the thickness direction within a cylindrical stator core. Each electromagnetic steel plate has an annular stator core body and multiple pole teeth located on the inner circumference of the stator core body and extending radially inward. The stator core positioning device includes: an outer component that contacts the radially inward end faces of the multiple pole teeth; an inner component located radially inward of the stator core than the outer component; an adjustment section located between the outer component and the inner component; and a moving mechanism that moves the inner component radially. The adjustment section adjusts the radial position of the outer component relative to the inner component.

[0009] According to one embodiment of the present invention, a stator core manufacturing method involves welding the outer periphery of a cylindrical stator core on which multiple electromagnetic steel plates are stacked along the thickness direction. The electromagnetic steel plates have an annular stator core body and multiple pole teeth located on the inner periphery of the stator core body and extending radially inward. The stator core manufacturing method includes: a measurement step, in which the positions of the radially inner end faces of a plurality of pole teeth of a stator core welded to its outer periphery are measured; an adjustment step, in which, based on the measured positions of the radially inner end faces of the plurality of pole teeth of the stator core, an adjustment is performed by an adjustment unit of a positioning device, the positioning device including: an outer component, an inner component, an adjustment unit, and a moving mechanism, the outer component contacting the radially inner end faces of the plurality of pole teeth, the inner component being located radially inner than the outer component of the stator core, the adjustment adjusting the radial position of the outer component relative to the inner component, and the moving mechanism moving the inner component radially; a positioning step, in which a radially outer force of the stator core is applied to the radially inner end faces of the plurality of pole teeth; and a welding step, in which the outer periphery of the stator core is welded while the plurality of pole teeth are under force.

[0010] According to one embodiment of the present invention, a stator core positioning device is capable of positioning multiple electromagnetic steel plates taking into account the shape and welding position of the electromagnetic steel plates.

[0011] According to an embodiment of the present invention, a stator core manufacturing method is capable of manufacturing a stator core by positioning multiple electromagnetic steel plates that take into account the shape and welding position of the electromagnetic steel plates.

[0012] The above and other features, elements, steps, characteristics and advantages of the present invention will be more clearly understood with reference to the accompanying drawings, provided that the preferred embodiments of the present invention are described in detail below. Attached Figure Description

[0013] Figure 1 A three-dimensional view of the stator core is shown.

[0014] Figure 2 A top view of the stamped electromagnetic steel sheet is shown.

[0015] Figure 3 A cross-sectional view of the stator core positioning device and a cross-sectional view of the stator core according to an embodiment of the present invention are shown.

[0016] Figure 4 Show Figure 3 View A in the diagram.

[0017] Figure 5This is a cross-sectional view showing the stator core positioning device according to an embodiment of the present invention in a state where the stator core is positioned.

[0018] Figure 6 Show Figure 5 View B in the diagram.

[0019] Figure 7 A flowchart illustrating a portion of the stator core manufacturing method according to an embodiment of the present invention is shown.

[0020] (Symbol Explanation)

[0021] 1. Stator core positioning device

[0022] 2. Placement platform

[0023] 3. Mobile mechanism

[0024] 4. Weight plate

[0025] 5 First pressing component

[0026] 6 Second pressing component

[0027] 7. External components

[0028] 7a Radial contact portion

[0029] 8. Inner components

[0030] 8a Axial contact portion

[0031] 9. Adjustment section

[0032] 10 Connecting components

[0033] 11. Guiding components

[0034] 12 positioning blades

[0035] 100 stator core

[0036] 101 Electromagnetic Steel Sheet

[0037] 102 Stator core body

[0038] 102a Inner circumferential surface

[0039] 102b outer periphery

[0040] 103 pole teeth

[0041] 103a end face. Detailed Implementation

[0042] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, the same or equivalent parts in the drawings will be labeled with the same reference numerals without repetition of their descriptions. Also, the dimensions of the constituent parts in the drawings do not faithfully represent the actual dimensions of the constituent parts or the dimensional ratios of each constituent part.

[0043] Furthermore, in the following description of the positioning device 1 for the stator core 100, which is an exemplary embodiment of the present invention, the direction parallel to the axis P of the stator core 100 is referred to as the "axial direction" or "stator core axial direction," the direction orthogonal to the axis P is referred to as the "radial direction" or "stator core radial direction," and the direction along the arc centered on the axis P is referred to as the "circumferential direction" or "stator core circumferential direction." Additionally, the vertical direction in which the positioning device 1 for the stator core 100 is installed is defined as the "up-down direction." However, the above definitions of directions do not imply limitation on the orientation of the stator core 100 when using the positioning device 1.

[0044] Furthermore, in the following explanation, the terms "fixed," "connected," "joined," and "installed" (hereinafter referred to as "fixed, etc.") include not only cases where parts are directly fixed to each other, but also cases where they are fixed via other parts. That is, in the following explanation, "fixed, etc." means both direct and indirect fixing of parts to each other.

[0045] Furthermore, in the following description of the positioning device 1 for the stator core 100, the stator core 100 refers to a structure formed by stacking electromagnetic steel plates 101 along the thickness direction. The stator core 100 has a through hole 105 for receiving the rotor (see reference). Figure 1 The stator core 100 is a cylindrical shape extending along the axial direction.

[0046] [Structure of stator core 100]

[0047] use Figure 1 and Figure 2 The stator core 100, positioned by the positioning device 1 of the stator core 100, will be described. Figure 1 This is a 3D view of stator core 100. Figure 2 This is a top view of the stamped electromagnetic steel sheet 101.

[0048] like Figure 1As shown, the stator core 100 has multiple annular electromagnetic steel plates 101, which have a defined shape and are stacked along the thickness direction. The stator core 100 is welded to each other along the thickness direction at multiple locations on its outer peripheral surface 102b. The stator core 100 has: a cylindrical stator core body 102; multiple pole teeth 103 extending radially inward from the inner peripheral surface 102a of the cylindrical stator core body 102; and multiple flanges 104 extending radially outward from the outer peripheral surface 102b of the cylindrical stator core body 102. The end face 103a, located at the front end of the multiple pole teeth 103 and serving as the radially inward end face, constitutes the inner peripheral surface of the through hole 105. That is, each end face 103a of the multiple pole teeth 103 is a curved surface with a certain radius of curvature centered on the axis P of the stator core 100.

[0049] like Figure 2 As shown, the electromagnetic steel plate 101 has an annular stator core body portion 101a, a plurality of rectangular pole teeth portions 101b, and a plurality of flange portions 101c. The plurality of pole teeth portions 101b are located on the inner circumferential side of the stator core body portion 101a and extend radially inward from the stator core body portion 101a. The plurality of flange portions 101c extend radially outward from the stator core body portion 101a. Figure 2 As shown, the stator core body 101a of the plurality of electromagnetic steel plates 101 stacked along the thickness direction constitutes the stator core body 102 of the stator core 100. The pole tooth portion 101b of the plurality of electromagnetic steel plates 101 stacked along the thickness direction constitutes the plurality of pole teeth 103 of the stator core 100. The flange portion 101c of the plurality of electromagnetic steel plates 101 stacked along the thickness direction constitutes the plurality of flanges 104 of the stator core 100.

[0050] The stator core 100 is welded to the outer peripheral surface 102b of the cylindrical stator core body 102 using a welding device (not shown). The welding portions 106 are located within the area of ​​all the stacked electromagnet plates 101. That is, the welding portions 106 have a shape that extends linearly from one end to the other in the axial direction of the stator core 100. In this embodiment, eight linear welding portions 106 are welded to the stator core 100.

[0051] [Implementation Method 1]

[0052] Next, use Figure 3 and Figure 4 An exemplary embodiment 1 of the positioning device 1 for the stator core 100 of the present invention will be described. Figure 3 These are cross-sectional views of the positioning device 1 of the stator core 100 and the stator core 100. Figure 4 yes Figure 3 View A in the diagram.

[0053] [Structure of positioning device 1 for stator core 100]

[0054] The positioning device 1 of the stator core 100 positions the stator core 100, which is formed by stacking electromagnetic steel plates 101 along the thickness direction, before welding is performed by a welding device (not shown). The welding device is a device for welding multiple electromagnetic steel plates 101 stacked along the thickness direction by a stamping device (not shown).

[0055] like Figure 3 As shown, the positioning device 1 of the stator core 100 positions multiple electromagnetic steel plates 101 within the cylindrical stator core 100, which has multiple electromagnetic steel plates 101 stacked along its thickness direction (see reference). Figure 1 The electromagnetic steel plate 101 has an annular stator core body 101a and a plurality of pole teeth 101b located on the inner circumference of the stator core body 101a and extending radially inward toward the stator core body 101a. The positioning device 1 of the stator core 100 has a mounting platform 2, a moving mechanism 3, a plurality of outer parts 7, a plurality of inner parts 8, a plurality of adjusting parts 9, a guiding part 11, and a positioning blade 12.

[0056] The mounting platform 2 is a platform for mounting the stator core 100. The mounting platform 2 is a plate-shaped component. The upper surface of the mounting platform 2 serves as the mounting surface, which is horizontally fixed to a grounding surface (not shown). The stator core 100 is mounted on the mounting platform 2 with its axis P oriented perpendicular to the mounting surface. That is, the stator core 100 is mounted on the mounting platform 2 with its axial direction oriented vertically. The mounting platform 2 has a mounting platform through-hole 2a at approximately its center. Viewed from the axial direction of the stator core 100, the mounting platform through-hole 2a overlaps with the through-hole 105 of the stator core 100. A second pressing member 6 of the moving mechanism 3 is inserted into the mounting platform through-hole 2a. The mounting platform 2 has a positioning pin (not shown) for positioning the stator core 100. The positioning pin extends from the mounting surface along the axial direction.

[0057] The moving mechanism 3 is a mechanism that moves the outer component 7, the inner component 8, and the adjusting part 9 radially. The moving mechanism 3 has a weight plate 4, a first pressing component 5, and a second pressing component 6.

[0058] The weight plate 4, acting as a pressing device, applies an axial force to the stator core 100 mounted on the mounting platform 2. The weight plate 4 is supported by an actuator (not shown). The weight plate 4 is located above the mounting platform 2. Furthermore, when viewed from the axial direction of the stator core 100 mounted on the mounting platform 2, the weight plate 4 overlaps with the mounting platform 2. The weight plate 4 can be moved vertically along the axial direction by the actuator (not shown). The weight plate 4 can increase the weight of the stator core 100 mounted on the mounting platform 2 along the axial direction. Hereinafter, the axial direction of the stator core 100 mounted on the mounting platform 2 will be referred to as the "axial direction." The radial direction of the stator core 100 mounted on the mounting platform 2 will be referred to as the "radial direction." The circumferential direction of the stator core 100 mounted on the mounting platform 2 will be referred to as the "circumferential direction."

[0059] The first pressing member 5, serving as a pressing member, is a member that applies axial force to the inner member 8. The first pressing member 5 is, for example, a cylindrical member. The first pressing member 5 is fixed to the weight plate 4 in an extending direction toward the axial direction. The first pressing member 5 includes at least one pressing member capable of pressing the inner member 8. The first pressing member 5 has a first inclined surface 5a, which is an inclined surface located radially outward from the stator core 100 mounted on the mounting platform 2, moving away from the inner member 8 from one end located on the axial side of the mounting platform 2. In this embodiment, the first pressing member 5 is a tapered shaft with the first inclined surface 5a covering the entire circumference of its outer peripheral surface. The first inclined surface 5a is a cam surface that moves the inner member 8. The first inclined surface 5a overlaps with the inner member 8 on the mounting platform 2 when viewed from the axial direction. That is, the first pressing member 5 can apply weight to the inner member 8 from the axial direction by moving along the axial direction using the first inclined surface 5a.

[0060] The second pressing member 6, serving as a pressing member, is a member that applies force to the inner member 8. The second pressing member 6 is, for example, a rod-shaped member. The second pressing member 6 extends in the axial direction and is supported by an actuator (not shown). The second pressing member 6 has a second inclined surface 6a, which is an inclined surface located radially outward from the stator core 100 mounted on the mounting platform 2, moving away from the inner member 8 from one end in the axial direction of the mounting platform 2. In this embodiment, the second pressing member 6 is a tapered shaft with the second inclined surface 6a covering the entire circumference of its outer peripheral surface. The second inclined surface 6a is a cam surface that moves the inner member 8. When viewed from the axial direction, the second inclined surface 6a overlaps with the inner member 8 on the mounting platform 2. That is, by moving along the axial direction, the second pressing member 6 can apply force to the inner member 8 along the axial direction using the second inclined surface 6a.

[0061] like Figure 3 and Figure 4As shown, the outer component 7 positions multiple electromagnetic steel plates 101 stacked along the thickness direction. The outer component 7 is located on the mounting platform 2. The outer surface of the outer component 7 located radially outward is a radial contact portion 7a that contacts the end face 103a of the pole tooth 103. The radial contact portion 7a is a curved surface whose radius of curvature is approximately equal to that of the end face 103a of the pole tooth 103 when viewed from the axial direction. The inner surface of the outer component 7 located radially inward is an outer reference surface 7b that serves as a reference for the radial position of the outer component 7. The outer reference surface 7b is a plane that is contacted by the pin of the adjustment part 9.

[0062] The circumferential length L1 of the radial contact portion 7a is the length that the end faces 103a of the plurality of pole teeth 103 can contact. The axial length L2 of the radial contact portion 7a is approximately equal to the length Lc from one end of the stator core 100 in the axial direction to the other end in the axial direction. The radial contact portion 7a can simultaneously contact the end faces 103a of the plurality of pole teeth 103. At this time, the radial contact portion 7a covers each end face 103a of the plurality of pole teeth 103. Thus, the radial contact portion 7a positions the radial position of the pole teeth 103 in the plurality of electromagnetic steel plates 101 stacked along the thickness direction within a predetermined range relative to the radial contact portion 7a. In addition, the outer component 7 has a positioning blade 12 for circumferential positioning.

[0063] The inner component 8 is the component that contacts the first pressing component 5 and the second pressing component 6. The inner component 8 is located on the mounting platform 2. Furthermore, the inner component 8 is located radially inside the outer component 7. The inner surface of the inner component 8 located radially inside is an axial direction contact portion 8a that is pressed axially by the first pressing component 5 and the second pressing component 6. The axial direction contact portion 8a is a curved surface with a radius of curvature centered on the axis P of the stator core 100 when viewed from the axial direction. That is, the axial direction contact portion 8a is a curved surface with a radius of curvature centered on the axis P of the stator core 100 when viewed from the stacking direction of the plurality of electromagnetic steel plates 101 of the stator core 100. Thus, the axial direction contact portion 8a and the radial contact portion 7a are located on concentric circles centered on the axis P when viewed from the axial direction. The outer surface of the inner component 8 located radially outside is an inner reference surface 8b that serves as a reference for the radial position of the inner component 8. The inner reference surface 8b is a plane for contact with the pins included in the adjustment portion 9. The inner datum plane 8b is opposite to the outer datum plane 7b. Furthermore, the inner datum plane 8b is parallel to the outer datum plane 7b.

[0064] The axial contact portion 8a located radially inward in the inner component 8 is an inclined surface. The axial contact portion 8a is a cam surface that moves the inner component 8 radially outward. The axial contact portion 8a is located radially inward in the inner component 8 as it moves from the axial ends located at both ends of the axial direction toward the axial direction. That is, the axial contact portion 8a has an inclined surface on the side of the first pressing member 5 and an inclined surface on the side of the second pressing member 6. When viewed from the axial direction, the axial contact portion 8a overlaps with the first pressing member 5 and the second pressing member 6. The inner component 8 can apply pressure to the axial contact portion 8a from the axial direction using the first pressing member 5 and the second pressing member 6. The inner component 8 can move radially outward by applying an axial force to the axial contact portion 8a using the first pressing member 5 and the second pressing member 6.

[0065] The adjustment part 9 is a component that adjusts the radial position of the outer component 7 relative to the inner component 8. The adjustment part 9 is located between the outer component 7 and the inner component 8. The adjustment part 9 adjusts the interval between the outer component 7 and the inner component 8. The adjustment part 9 is, for example, a square pin that can be inserted between the outer reference surface 7b of the outer component 7 and the inner reference surface 8b of the inner component 8. The adjustment part 9 adjusts the radial position of the outer reference surface 7b relative to the inner reference surface 8b by inserting a square pin with a different width between opposite sides when viewed axially between the outer component 7 and the inner component 8.

[0066] The outer component 7 and the inner component 8 are connected by a connecting component 10. The connecting component 10 is located on both end faces of the outer component 7 and the inner component 8 in the axial direction. The two ends of the outer component 7 in the axial direction are connected to the connecting component 10 by bolts (not shown). The two ends of the inner component 8 in the axial direction are connected to the connecting component 10 by bolts (not shown). Furthermore, the inner component 8 and the outer component 7 are connected by the connecting component 10 when the adjusting part 9 is inserted between the outer component 7 and the inner component 8.

[0067] In this embodiment, one of the inner components 8 and one of the outer components 7 are connected by one of the connecting components 10. That is, the positioning device 1 of the stator core 100 has multiple outer components 7, inner components 8, and adjusting parts 9 connected by the connecting parts 10. In addition, multiple outer components 7, inner components 8, and adjusting parts 9 connected by the connecting parts 10 are arranged in the circumferential direction of the stator core 100. The multiple outer components 7 arranged in the circumferential direction can contact the multiple pole teeth 103 located radially outward from the radial direction.

[0068] The guide member 11 is a component that guides the outer component 7, inner component 8, and adjusting part 9 connected by the connecting member 10 in the radial direction. The guide member 11 is an annular plate component. The guide member 11 is located on the mounting platform 2. On the guide member 11, a plurality of outer components 7, inner components 8, and adjusting parts 9 connected by the connecting member 10 are arranged circumferentially. The guide member 11 supports the outer components 7, inner components 8, and adjusting parts 9 connected by the connecting member 10 so that they can move radially. That is, the guide member 11 restricts the circumferential movement of the outer components 7, inner components 8, and adjusting parts 9 connected by the connecting member 10.

[0069] The positioning blade 12, serving as a circumferential positioning component, positions the stator core 100 circumferentially relative to the outer component 7. The positioning blade 12 is a generally rectangular plate component. The positioning blade 12 is positioned on the guide component 11 with its long side facing the axial direction. The positioning blade 12 is connected to the outer component 7 with its short side facing radially. Thus, the positioning blade 12 is positioned on the guide component 11 with its thickness direction circumferentially towards the stator core 100 placed on the mounting platform 2.

[0070] Multiple positioning blades 12 are arranged circumferentially. The radially outer front end of the positioning blade 12 is located radially outer than the radial contact portion 7a of the outer component 7. The positioning blade 12 can be inserted between adjacent pole teeth 103 of the stator core 100 placed on the mounting platform 2. Thus, the positioning blades 12 position the stator core 100 circumferentially relative to the outer component 7.

[0071] like Figure 3 As shown, when the second inclined surface 6a of the second pressing member 6 and the first inclined surface 5a of the first pressing member 5 do not apply force to the axial contact portion 8a of the inner member 8, the outer member 7 is located at the release position P1, which is not in contact with the stator core 100. Figure 5 As shown, when the second inclined surface 6a of the second pressing member 6 and the first inclined surface 5a of the first pressing member 5 apply force axially to the contact portion 8a of the inner member 8, the outer member 7 is positioned at the positioning position P2 where the radial contact portion 7a of the outer member 7 contacts the stator core 100. Furthermore, when the outer member 7 is in the release position P1, the adjusting unit 9 adjusts the position of the radial contact portion 7a of the outer member 7 relative to the end face 103a of the pole tooth 103.

[0072] The positioning device 1 of the stator core 100 configured as described above can move the multiple outer parts 7 arranged in the circumferential direction between the release position P1 and the positioning position P2 by means of the first pressing member 5 and the second pressing member 6. The positioning device 1 of the stator core 100 can be positioned radially by moving the multiple outer parts 7 to the positioning position P2, thereby positioning the multiple electromagnetic steel plates 101 stacked in the thickness direction.

[0073] Next, use Figures 3 to 7 The manufacturing method S100 of the stator core 100, which uses a welding device (not shown) including the positioning device 1 of the stator core 100 according to Embodiment 1 to weld the outer peripheral surface 102b of the stator core 100, will be described. Figure 5 This is a cross-sectional view of the stator core 100 in the state where the positioning device 1 positions the stator core 100. Figure 7 This is a flowchart of the stator core manufacturing method according to an embodiment of the present invention.

[0074] like Figure 7 As shown, the manufacturing method S100 includes a measuring step S110, an adjusting step S120, a positioning step S130, and a welding step S140.

[0075] Measurement step S110 is a process of measuring the position of the end faces 103a of the multiple pole teeth 103 in the stator core 100 that are welded to the outer peripheral surface 102b. In measurement step S110, the inner diameter of the multiple stator cores 100 that are welded is measured.

[0076] The adjustment process S120 is a process of adjusting the position of the outer component 7 relative to the inner component 8 by means of the adjustment unit 9, based on the measured position of the radially inner end face 103a of the pole teeth 103 in the plurality of stator cores 100. In the adjustment process S120, the position of each outer component 7 relative to the inner component 8 is determined according to the measured value of the inner diameter of the stator core 100 measured in the measurement process S110. For example, the outer component 7, which includes the portion of the stator core 100 with a large radially inward distortion after welding, moves from the inner component 8 to the radially outward. The adjustment process S120 adjusts the position of the outer component 7 relative to the inner component 8 by replacing the square pin of the adjustment unit 9.

[0077] The positioning process S130 is a process in which a radially outward force is applied to the multiple pole teeth 103 of the stator core 100 by the outer component 7.

[0078] like Figure 3 and Figure 4As shown, in the positioning process S130, the stator core 100 before welding is placed on the mounting table 2. The stator core 100 is positioned by positioning pins (not shown). Multiple outer components 7, adjusting parts 9, and inner components 8, connected by connecting parts 10, are arranged circumferentially and positioned within the through holes 105 of the stator core 100. Additionally, positioning blades 12 are inserted between multiple pole teeth 103 of the stator core 100. Thus, the circumferential positions of the multiple outer components 7 arranged circumferentially relative to the stator core 100 are determined. The outer components 7 are positioned at locations within the circumferential range of the welding portion 106 on the outer peripheral surface 102b of the stator core 100. The outer components 7 are positioned at the release position P1.

[0079] like Figure 5 and Figure 6 As shown, the first pressing member 5, supported by the weight plate 4, moves toward the inner member 8 together with the weight plate 4. Then, the second pressing member 6, supported by an actuator (not shown), moves toward the inner member 8. When the first inclined surface 5a of the first pressing member 5 contacts the axial contact portion 8a on the first pressing member 5 side of the inner member 8, an axial force is applied to the inner member 8. Similarly, when the second inclined surface 6a of the second pressing member 6 contacts the axial contact portion 8a on the second pressing member 6 side of the inner member 8, an axial force is applied to the inner member 8.

[0080] The axial contact portion 8a and the first inclined surface 5a, acting as a direct-acting cam mechanism, convert the axial force generated by the first pressing member 5 into a radial force. Similarly, the axial contact portion 8a and the second inclined surface 6a, acting as a direct-acting cam mechanism, convert the axial force of the second pressing member 6 into a radial force. Thus, the first pressing member 5 and the second pressing member 6, by applying an axial force to the inner member 8, move the outer member 7 together with the inner member 8 from the release position P1 to the radially outward positioning position P2. That is, the first pressing member 5 and the second pressing member 6, by applying an axial force to the plurality of circumferentially arranged inner members 8, cause the plurality of circumferentially arranged outer members 7 to move radially outward, respectively.

[0081] Each radial contact portion 7a of the plurality of outer components 7, moved to the positioning position P2, contacts the end face 103a of the plurality of pole teeth 103 located in the moving direction of each outer component 7. The radial contact portion 7a applies a radially outward force to the end face 103a of the pole teeth 103. The outer components 7 correct the circumferential position of the plurality of electromagnetic steel plates 101 stacked along the thickness direction. Each outer component 7 adjusts its radial position relative to the inner component 8 based on the measurement values ​​of the plurality of welded stator cores 100 measured in the measurement process S110. Therefore, each outer component 7 corrects the circumferential portion of the stator core 100 radially outward by a correction amount corresponding to the estimated deformation caused by welding in the stator core 100.

[0082] The positioning device 1 of the stator core 100 adds weight to the stator core 100 on the mounting platform 2 in the axial direction via the weight plate 4. At this time, the stator core 100 is held by the weight plate 4 and the mounting platform 2 in a state where it is radially positioned by multiple outer components 7. The positioning device 1 of the stator core 100 maintains the state in which the stator core 100, positioned by the multiple outer components 7, is held by the weight plate 4 and the mounting platform 2.

[0083] like Figure 7 As shown, welding step S140 is a process of welding the outer periphery, i.e., the outer peripheral surface 102b, of the stator core 100 under a force applied in the axial direction to multiple pole teeth 103. In welding step S140, a welding apparatus (not shown) uses a laser welding machine (not shown) or the like to weld multiple stacked electromagnetic steel plates 101 along the axial direction. The welding apparatus sequentially welds multiple predetermined welding positions 106. At this time, the stator core 100 is corrected by the stator core 100 positioning device 1 to a shape that takes into account the deformation caused by welding. As a result, the deformation of the stator core 100 caused by welding can be appropriately suppressed.

[0084] When the welding of the stator core 100, performed by a welding machine (not shown), is completed, the first pressing member 5, together with the weight plate 4, moves away from the inner member 8. Simultaneously, the second pressing member 6, supported by an actuator (not shown), moves away from the inner member 8. The inner member 8 moves to the release position P1 via a tension spring (not shown). The outer member 7, connected to the inner member 8, separates from the stator core 100.

[0085] Thus, the positioning device 1 of the stator core 100 in Embodiment 1 corrects the radial position of the pole teeth 103 in the stacked electromagnetic steel plates 101 by means of multiple outer components 7. Each of the multiple outer components 7 can move radially via the moving mechanism 3. Furthermore, the radial position of each outer component 7 relative to the inner component 8 can be adjusted by the adjusting unit 9. That is, the positioning device 1 of the stator core 100 can adjust the position of each outer component 7 corresponding to a part of the stator core 100 based on the stamping shape of the through hole 105 of the stator core 100 and the amount of deformation caused by welding. Therefore, the positioning device 1 of the stator core 100 is corrected to a shape corresponding to the adjustment amount of the adjusting unit 9. Thus, positioning of multiple electromagnetic steel plates 101 taking into account the shape and welding position of the electromagnetic steel plates 101 is possible.

[0086] Furthermore, in the positioning device 1 of the stator core 100, multiple outer components 7, adjusting parts 9, and inner components 8 connected by connecting parts 10 are arranged circumferentially around the stator core 100. Therefore, each outer component 7 can maintain its position relative to the inner component 8. Additionally, the positioning blades 12 position the outer components 7 within a predetermined range relative to the circumferential position of the stator core 100. That is, the electromagnetic steel plate 101 can be positioned at the same location on multiple stator cores 100 with the same correction amount.

[0087] Furthermore, among the multiple outer components 7, the radial contact portion 7a located on the radially outer side can contact the end faces 103a of the multiple pole teeth 103. The radius of curvature of the radial contact portion 7a is equal to the radius of curvature of the end faces 103a of the pole teeth 103. Therefore, the outer component 7 simultaneously applies a radial force to the end faces 103a of the multiple pole teeth 103 opposite to the radial contact portion 7a. Therefore, the positioning device 1 of the stator core 100 can adjust the correction amount of the electromagnet plate 101 by using the circumferential range of the radial contact portion 7a of the outer component 7 as an adjustment range.

[0088] A pin, serving as the adjustment part 9, is inserted between the outer component 7 and the inner component 8, thereby adjusting the distance between the inner component 8 and the outer component 7 to a distance equal to the radial width of the pin. That is, by inserting a pin with an arbitrary radial width, the position of the outer component 7 relative to the inner component 8 can be adjusted to an arbitrary distance. Furthermore, when multiple pins with different radial widths are inserted between the outer component 7 and the inner component 8, the outer component 7 can be tilted circumferentially relative to the inner reference surface 8b of the inner component 8. This allows for the positioning of multiple electromagnetic steel plates 101, taking into account their shape and welding positions.

[0089] The inner component 8 moves radially outward together with the outer component 7 by applying an axial force to the axially oriented contact portion 8a, which is an inclined surface, from the first pressing component 5 and the second pressing component 6. Furthermore, the inner component 8 moves radially outward by applying force along the axial direction from the first inclined surface 5a of the first pressing component 5 and the second inclined surface 6a of the second pressing component 6. That is, the positioning device 1 of the stator core 100 moves axially by the first pressing component 5 and the second pressing component 6, and the multiple outer components 7 apply radial forces to the multiple electromagnetic steel plates 101 based on the amount of deformation caused by welding. Thus, positioning of the multiple electromagnetic steel plates 101, taking into account the shape and welding position of the electromagnetic steel plates 101, becomes possible.

[0090] [Other Implementation Methods]

[0091] The embodiments of the present invention have been described above, but these embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and the above embodiments can be appropriately modified without departing from the scope of the present invention.

[0092] In the above embodiment, the radial contact portion 7a is the outer peripheral surface of the outer member 7 located radially outward. However, the radial contact portion can be any shape capable of pressing the radially inner end face of the pole tooth 103. For example, the radial contact portion can also be the radially outward edge of the outer member whose outer peripheral surface is composed of a plane.

[0093] In the above embodiment, the moving mechanism 3 includes a weight plate 4, a first pressing member 5, and a second pressing member 6. However, the moving mechanism is only required to enable the outer component to move radially. The moving mechanism may also be an actuator such as a motor or cylinder that enables the outer components to move radially.

[0094] In the above embodiment, the outer components 7 are arranged at 6 points at equal intervals in the circumferential direction. However, the number and arrangement of the outer components are not limited. The number and position of the outer components can be arbitrarily set taking into account the welding positions and shape of the stator core.

[0095] In the above embodiment, the inner component 8 is subjected to force from one side of the axial direction by the first pressing component 5 and from the other side of the axial direction by the second pressing component 6. However, the inner component may also be subjected to axial force by either the first pressing component or the second pressing component. In this case, the inner component only needs to have an axial contact portion at at least one of the axial ends located at both ends of the axial direction.

[0096] In the above embodiment, the inner component 8 has an axial direction contact portion 8a that serves as an inclined surface, the first pressing component 5 has a first inclined surface 5a, and the second pressing component 6 has a second inclined surface 6a. The inner component 8 moves radially by contacting the axial direction contact portion 8a in the axial direction via the first inclined surface 5a and the second inclined surface 6a, respectively. However, when the inner component has an axial direction contact portion, the second pressing component and the first pressing component may not have inclined surfaces. Furthermore, when the first pressing component has a first inclined surface and the second pressing component has a second inclined surface, the inner component may not have inclined surfaces.

[0097] In the above embodiment, an outer component 7 is connected to an inner component 8 by a connecting member 10. However, multiple outer components can also be connected to an inner component by a connecting member.

[0098] In the above embodiment, the adjusting part 9 can adjust the gap between the outer part 7 and the inner part 8 by means of a pin. However, the adjusting mechanism only needs to be able to adjust the gap between the outer part 7 and the inner part 8. The adjusting mechanism can also be a structure that uses shims, screws, etc. for adjustment.

[0099] The present invention can be applied to the positioning device 1 of stator core 100.

Claims

1. A stator core positioning device, wherein the stator core positioning device positions multiple electromagnetic steel plates in a cylindrical stator core in which multiple electromagnetic steel plates are stacked along the thickness direction, the electromagnetic steel plates having an annular stator core body portion and multiple pole teeth located on the inner circumference side of the stator core body portion and extending radially inward, the stator core positioning device comprising: An outer component that contacts the radially inner end faces of the plurality of pole teeth; The inner component is located radially inside the stator core compared to the outer component; An adjustment section, the adjustment section being located between the outer component and the inner component; and A moving mechanism that causes the inner component to move radially. The adjustment unit adjusts the radial position of the outer component relative to the inner component.

2. The stator core positioning device as described in claim 1, wherein, The outer component, the inner component, and the adjustment section are arranged in multiple circumferential directions along the stator core.

3. The stator core positioning device as described in claim 1, wherein, When the stator core is viewed from the stacking direction of the multiple electromagnetic steel plates, the radius of curvature of the outer peripheral surface of the outer component located on the radially outer side is equal to the radius of curvature of the radially inner end face of the pole tooth.

4. The stator core positioning device as described in claim 2, wherein, When the stator core is viewed from the stacking direction of the multiple electromagnetic steel plates, the radius of curvature of the outer peripheral surface of the outer component located on the radially outer side is equal to the radius of curvature of the radially inner end face of the pole tooth.

5. The stator core positioning device as described in any one of claims 1 to 4, wherein, The adjustment part is at least one pin that can be inserted between the outer part and the inner part.

6. The stator core positioning device as described in any one of claims 1 to 4, wherein, The inner components each have an inclined surface located radially inward of the stator core, extending from at least one of the axially oriented ends located at both ends of the stator core towards the axial direction. The moving mechanism has at least one pressing member that applies a force in the axial direction to the inclined surface.

7. The stator core positioning device as described in any one of claims 1 to 4, wherein, The moving mechanism has a pressing component that applies a force along the axial direction of the stator core to the plurality of inner components. The pressing member has an inclined surface located radially outward from the stator core from at least one of the axial ends located at both ends of the axial direction toward a direction away from the inner member, and applies an axial force to the plurality of inner members through the inclined surface.

8. The stator core positioning device as described in any one of claims 1 to 4, wherein, The outer component and the inner component are connected by a connecting component.

9. The stator core positioning device as described in any one of claims 1 to 4, wherein, It has at least one circumferential positioning component, which is located radially outward of the stator core compared to the outer component. The circumferential positioning component has a circumferential width of the stator core that allows it to be inserted between adjacent pole teeth of the stator core.

10. A method for manufacturing a stator core, comprising welding the outer periphery of a cylindrical stator core having multiple electromagnetic steel plates stacked along its thickness direction, wherein the electromagnetic steel plates have an annular stator core body and multiple pole teeth located on the inner periphery of the stator core body and extending radially inward. The stator core manufacturing method has the following characteristics: The measurement process involves measuring the position of the radial inner end faces of multiple pole teeth of the stator core that are welded to the outer periphery. In the adjustment process, based on the measured positions of the radially inner end faces of the plurality of pole teeth in the stator core, an adjustment is performed by an adjustment unit of a positioning device. The positioning device has an outer component, an inner component, an adjustment unit, and a moving mechanism. The outer component contacts the radially inner end faces of the plurality of pole teeth, and the inner component is located radially inner to the stator core than the outer component. The adjustment unit adjusts the radial position of the outer component relative to the inner component, and the moving mechanism moves the inner component radially. A positioning process, wherein a force of the stator core is applied to the radially inner end faces of the plurality of pole teeth; and The welding process involves welding the outer periphery of the stator core while applying force to the plurality of pole teeth.

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