JP7447858B2 - Stator core positioning device and stator core manufacturing method - Google Patents

Description

The present invention relates to a stator core positioning device and a stator core manufacturing method.

A method for manufacturing a stator core is known in which a stator core having a plurality of electromagnetic steel sheets stacked in the thickness direction is welded from one axial end to the other axial end. For example, Patent Document 1 describes a lamination process in which a plurality of electromagnetic steel sheets are bonded and laminated with an adhesive, and a plurality of laminated electromagnetic steel sheets are punched into a shape having the teeth to produce an electromagnetic steel sheet unit. A method of manufacturing a stator core is disclosed, which includes a molding process and a welding process of stacking and welding a plurality of the electromagnetic steel sheet units to each other.

In the stator core manufacturing method of Patent Document 1, an adhesive such as an epoxy resin adhesive is applied to the adhesive surfaces of a plurality of strip steel plates in a lamination step. The strip-shaped steel plate is pressed from the front side and the back side by a pair of rollers. As a result, the plurality of strip steel plates are bonded and stacked in a direction perpendicular to their respective surfaces. In the forming process, a plurality of laminated strip-shaped steel plates are punched into steel plate units corresponding to stator cores having teeth. The plurality of steel plate units are stacked in a press forming apparatus so as to form a stator core shape. In the welding process, stator cores stacked in a breath forming machine are welded at welding locations by a welding device.

In conventional stator core manufacturing methods, in order to prevent interference between the stator core and rotor core, it is required to correct the positional deviation of the electromagnetic steel sheets and to suppress welding distortion due to welding. Therefore, the stator core is welded after positioning the electromagnetic steel plate using a positioning device. The positioning device performs positioning by inserting a cylindrical positioning member into a rotor through hole of the stator core. The positioned stator core is welded on its outer periphery while being pressurized in the axial direction.

In this way, in the starter core manufacturing method, the jig aligns the radial positions of the plurality of laminated electromagnetic steel plates and presses the electromagnetic steel plates in the stacking direction, thereby changing the shape of the stator core. is maintained in proper condition. Since the stator core is welded while being positioned in the radial direction by the jig, radial deformation due to the heat of welding is suppressed.

JP2020-188541

However, the positioning member has a cylindrical shape 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 tip end surface of the tooth, which is the inner peripheral surface of the through hole. Further, the stator core is formed by stacking punched electromagnetic steel plates. Therefore, the distortion of the through hole of the stator core is larger than that of the positioning member. Therefore, with the positioning device that inserts a positioning member having an outer diameter smaller than the inner diameter of the through hole of the stator core, it is not possible to appropriately position a plurality of electromagnetic steel plates and suppress distortion when welding them.

An object of the present invention is to provide a stator core positioning device that can position the plurality of electromagnetic steel plates in consideration of the shape and welding position of the electromagnetic steel plates.

A stator core positioning device according to an embodiment of the present invention includes an annular stator core body, and a plurality of teeth located on the inner peripheral side of the stator core body and extending radially inward. This is a stator core positioning device for positioning a plurality of electromagnetic steel plates in a cylindrical stator core in which a plurality of electromagnetic steel plates are laminated in the thickness direction. The stator core positioning device includes an outer member that contacts a radially inner end surface of the plurality of teeth, an inner member that is located radially inward of the stator core than the outer member, and an outer member. It has an adjustment part located between the inner member and a moving mechanism that moves the inner member in the radial direction. The adjustment section adjusts the position of the outer member in the radial direction with respect to the inner member.

A method for manufacturing a stator core according to an embodiment of the present invention includes: an annular stator core body; a plurality of teeth located on the inner peripheral side of the stator core body and extending radially inward; This is a method for manufacturing a stator core in which the outer periphery of a cylindrical stator core in which a plurality of electromagnetic steel sheets having the following are laminated in the thickness direction is welded. The stator core manufacturing method includes a measuring step of measuring the positions of radially inner end surfaces of a plurality of teeth in a stator core whose outer periphery is welded, and an outer member that contacts the radially inner end surfaces of the plurality of teeth. an inner member located radially inward of the stator core than the outer member; an adjustment section that adjusts the radial position of the outer member relative to the inner member; an adjustment step in which a positioning position adjustment unit having a moving mechanism for moving the plurality of teeth is adjusted based on the already measured position of the radially inner tip surface of the plurality of teeth in the stator core; The method includes a positioning step of applying a radially outward force of the stator core to a radially inner end surface, and a welding step of welding the outer periphery of the stator core while applying force to the plurality of teeth.

According to the stator core positioning device according to an embodiment of the present invention, it is possible to position the plurality of electromagnetic steel plates in consideration of the shape and welding position of the electromagnetic steel plates.

According to the method for manufacturing a stator core according to an embodiment of the present invention, a stator core can be manufactured by positioning a plurality of electromagnetic steel plates in consideration of the shape and welding position of the electromagnetic steel plates.

FIG. 1 shows a perspective view of a stator core. FIG. 2 shows a plan view of a pressed electrical steel sheet. FIG. 3 shows a cross-sectional view of a stator core positioning device and a cross-sectional view of the stator core according to an embodiment of the present invention. FIG. 4 shows a view taken along arrow A in FIG. FIG. 5 shows a cross-sectional view in a state where the stator core positioning device according to the embodiment of the present invention is positioning the stator core. FIG. 6 shows a view taken along arrow B in FIG. FIG. 7 shows a flow diagram of a portion of a method for manufacturing a stator core according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the figures are given the same reference numerals, and the description thereof will not be repeated. Furthermore, the dimensions of the constituent members in each figure do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of each constituent member.

In addition, in the following description of the positioning device 1 for the stator core 100, which is an exemplary embodiment of the present invention, a direction parallel to the axis P of the stator core 100 will be referred to as an "axial direction" or a "stator core axial direction." '', the direction perpendicular to the axis P is referred to as the ``radial direction'' or the ``stator core radial direction'', and the direction along the arc centered on the axis P is referred to as the ``circumferential direction'' or the ``stator core circumferential direction'', respectively. Further, the vertical direction in which the positioning device 1 of the stator core 100 is installed is defined as the "vertical direction." However, this definition of the direction is not intended to limit the orientation of the stator core 100 when the positioning device 1 is used.

In addition, in the following explanation, expressions such as "fixing", "connecting", "joining", and "attaching" (hereinafter referred to as "fixing, etc.") are used not only when members are directly fixed to each other, but also when they are connected to other parts. This also includes cases where it is fixed via a member. That is, in the following description, expressions such as fixation include direct and indirect fixation of members.

Furthermore, in the following description of the positioning device 1 for the stator core 100, the stator core 100 means a structure formed by laminating electromagnetic steel sheets 101 in the thickness direction. Stator core 100 has a through hole 105 that accommodates a rotor (see FIG. 1). Stator core 100 has a cylindrical shape extending along the axial direction.

[Configuration of stator core 100]
The stator core 100 positioned by the stator core 100 positioning device 1 will be described using FIGS. 1 and 2. FIG. FIG. 1 is a perspective view of a stator core 100. FIG. 2 is a plan view of the pressed electrical steel sheet 101.

As shown in FIG. 1, the stator core 100 includes a plurality of annular electromagnetic steel plates 101 having a predetermined shape and stacked in the thickness direction. The stator core 100 is welded to each other in the thickness direction at a plurality of locations on the outer circumferential surface 102b. The stator core 100 includes a cylindrical stator core body 102, a plurality of teeth 103 extending radially inward from an inner peripheral surface 102a of the cylindrical stator core body 102, and a cylindrical stator core body 102. It has a plurality of flanges 104 extending radially outward from the outer circumferential surface 102b. An end surface 103a, which is a radially inner end surface located at the tip of the plurality of teeth 103, constitutes an inner circumferential surface of the through hole 105. That is, each end surface 103a of the plurality of teeth 103 is a curved surface having a constant radius of curvature centered on the axis P of the stator core 100.

As shown in FIG. 2, the electromagnetic steel sheet 101 has an annular stator core body portion 101a, a plurality of rectangular teeth portions 101b, and a plurality of flange portions 101c. The plurality of teeth portions 101b are located on the inner peripheral side of the stator core body portion 101a and extend inward in the radial direction of the stator core body portion 101a. The plurality of flange portions 101c extend radially outward from the stator core body portion 101a. As shown in FIG. 2, stator core body portions 101a of a plurality of electromagnetic steel plates 101 stacked in the thickness direction constitute a stator core body 102 of the stator core 100. The teeth portions 101b of the plurality of electromagnetic steel sheets 101 stacked in the thickness direction constitute the plurality of teeth 103 of the stator core 100. The flange portions 101c of the plurality of electromagnetic steel sheets 101 stacked in the thickness direction constitute the plurality of flanges 104 of the stator core 100.

In the stator core 100, a plurality of linear welding points 106 extending in the thickness direction are welded to the outer circumferential surface 102b of a cylindrical stator core body 102 using a welding device (not shown). The welding location 106 is located within the range of all the laminated electromagnetic steel sheets 101. That is, the welding location 106 has a shape that extends linearly from one end of the stator core 100 in the axial direction to the other end. In this embodiment, the stator core 100 is welded at eight linear welding points 106.

[Embodiment 1]
Next, a first exemplary embodiment of a positioning device 1 for a stator core 100 according to the present invention will be described using FIGS. 3 and 4. FIG. FIG. 3 is a cross-sectional view of the positioning device 1 for the stator core 100 and a cross-sectional view of the stator core 100. FIG. 4 is a view taken along arrow A in FIG.

[Configuration of positioning device 1 for stator core 100]
The positioning device 1 for the stator core 100 positions the stator core 100 in which electromagnetic steel sheets 101 are laminated in the thickness direction before welding is performed by a welding device (not shown). The welding device is a device that welds a plurality of electromagnetic steel sheets 101 stacked in the thickness direction using a press device (not shown).

As shown in FIG. 3, the positioning device 1 for the stator core 100 includes an annular stator core body 101a, and a positioning device 1 located on the inner circumferential side of the stator core body 101a. A plurality of electromagnetic steel plates 101 are positioned in a cylindrical stator core 100 in which a plurality of electromagnetic steel plates 101 (see FIG. 1) having a plurality of teeth portions 101b extending inward are stacked in the thickness direction. A positioning device 1 for a stator core 100 includes a mounting table 2, a moving mechanism 3, a plurality of outer members 7, a plurality of inner members 8, a plurality of adjustment parts 9, a guide member 11, and a positioning blade 12. ,have.

The mounting table 2 is a table on which the stator core 100 is placed. The mounting table 2 is a plate-like member. The mounting table 2 is fixed to a ground surface (not shown) with its upper surface as a mounting surface and the mounting surface horizontally. The stator core 100 is mounted on the mounting table 2 with the axis P of the stator core 100 oriented in a direction perpendicular to the mounting surface. That is, the stator core 100 is placed on the mounting table 2 with the axial direction facing up and down. The mounting table 2 has a mounting table through hole 2a approximately in the center. The mounting table through-hole 2 a overlaps with the through-hole 105 of the stator core 100 when viewed in the axial direction of the stator core 100 . The second pressing member 6 of the moving mechanism 3 is inserted into the mounting table through hole 2a. The mounting table 2 has a positioning pin (not shown) that positions the stator core 100. The positioning pin extends in the axial direction from the mounting surface.

The moving mechanism 3 is a mechanism that moves the outer member 7, the inner member 8, and the adjustment section 9 in the radial direction. The moving mechanism 3 includes a weight plate 4, a first pressing member 5, and a second pressing member 6.

The weight plate 4, which is a pressing device, applies a force in the axial direction to the stator core 100 placed on the mounting table 2. The weight plate 4 is supported by an actuator (not shown). The weight plate 4 is located above the mounting table 2. Further, the weight plate 4 overlaps the mounting table 2 when viewed in the axial direction of the stator core 100 placed on the mounting table 2. The weight plate 4 is movable in the axial direction, that is, the up and down direction, by an actuator (not shown). The weight plate 4 can apply weight to the stator core 100 placed on the mounting table 2 in the axial direction. Hereinafter, the axial direction of the stator core 100 placed on the mounting table 2 will be referred to as the "axial direction." Further, the radial direction of the stator core 100 placed on the mounting table 2 will be referred to as a "radial direction." Further, the circumferential direction of the stator core 100 placed on the mounting table 2 will be referred to as the "circumferential direction."

The first pressing member 5, which is a pressing member, is a member that applies a force in the axial direction 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 with its stretching direction oriented in 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 extends in the radial direction of the stator core 100 placed on the mounting table 2 as it moves away from the inner member 8 from the axial end located at one end on the mounting table 2 side in the axial direction. It has a first inclined surface 5a which is an outwardly located inclined surface. In this embodiment, the first pressing member 5 is a tapered shaft having a first inclined surface 5a around the entire outer peripheral surface. The first inclined surface 5a is a cam surface that moves the inner member 8. The first inclined surface 5a overlaps the inner member 8 on the mounting table 2 when viewed in the axial direction. In other words, by moving in the axial direction, the first pressing member 5 can apply weight to the inner member 8 from the axial direction using the first inclined surface 5a.

The second pressing member 6, which is 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 is supported by an actuator (not shown) with its stretching direction facing the axial direction. The second pressing member 6 extends in the radial direction of the stator core 100 placed on the mounting table 2 as it moves away from the inner member 8 from the axial end located at one end on the mounting table 2 side in the axial direction. It has a second inclined surface 6a which is an outwardly located inclined surface. In this embodiment, the second pressing member 6 is a tapered shaft having a second inclined surface 6a around the entire outer peripheral surface. The second inclined surface 6a is a cam surface that moves the inner member 8. The second inclined surface 6a overlaps the inner member 8 on the mounting table 2 when viewed in the axial direction. That is, by moving in the axial direction, the second pressing member 6 can apply force to the inner member 8 in the axial direction using the second inclined surface 6a.

As shown in FIGS. 3 and 4, the outer member 7 positions a plurality of electromagnetic steel plates 101 stacked in the thickness direction. The outer member 7 is located on the mounting table 2. The outer surface of the outer member 7 located radially outward is a radial contact portion 7a that contacts the end surface 103a of the teeth 103. The radial contact portion 7a is a curved surface with a radius of curvature approximately equal to the radius of curvature of the end surface 103a of the teeth 103 when viewed in the axial direction. The inner surface of the outer member 7 located radially inward is an outer reference surface 7b that is a reference for the radial position of the outer member 7. The outer reference surface 7b is a plane with which the pin that is the adjustment part 9 comes into contact.

The circumferential length L1 of the radial contact portion 7a is a length that allows the end surfaces 103a of the plurality of teeth 103 to come into contact with each other. The axial length L2 of the radial contact portion 7a is approximately equal to the length Lc from one axial end to the other axial end of the stator core 100. The radial contact portion 7a can contact the end surfaces 103a of the plurality of teeth 103 at the same time. At this time, the radial contact portion 7a covers each end surface 103a of the plurality of teeth 103. Thereby, the radial contact portion 7a positions each of the teeth 103 in the plurality of electromagnetic steel plates 101 stacked in the thickness direction within a predetermined range with respect to the radial contact portion 7a. Further, the outer member 7 has a positioning blade 12 that positions the position in the circumferential direction.

The inner member 8 is a member that contacts the first pressing member 5 and the second pressing member 6. The inner member 8 is located on the mounting table 2. Further, the inner member 8 is located radially inward of the outer member 7. The inner surface of the inner member 8 located radially inward is an axial contact portion 8a that is pushed in the axial direction by the first pressing member 5 and the second pressing member 6. The axial contact portion 8a is a curved surface with a radius of curvature centered on the axis P of the stator core 100 when viewed in the axial direction. That is, the axial contact portion 8 a is a curved surface with a radius of curvature centered on the axis P of the stator core 100 when viewed in the lamination direction of the plurality of electromagnetic steel sheets 101 in the stator core 100 . Thereby, the axial contact portion 8a and the radial contact portion 7a are located on concentric circles centered on the axis P when viewed in the axial direction. The outer surface of the inner member 8 located outward in the radial direction is an inner reference surface 8b that is a reference for the position of the inner member 8 in the radial direction. The inner reference surface 8b is a plane with which the pin included in the adjustment section 9 comes into contact. The inner reference surface 8b faces the outer reference surface 7b. Further, the inner reference surface 8b is parallel to the outer reference surface 7b.

The axial contact portion 8a located radially inward in the inner member 8 is an inclined surface. The axial contact portion 8a is a cam surface that moves the inner member 8 radially outward. The axial contact portions 8a are located radially inward in the axial direction from the axial end portions located at both ends of the inner member 8 in the axial direction. That is, the axial contact portion 8a has an inclined surface on the first pressing member 5 side and an inclined surface on the second pressing member 6 side. The axial contact portion 8a overlaps the first pressing member 5 and the second pressing member 6 when viewed in the axial direction. The inner member 8 can apply weight to the axial contact portion 8a from the axial direction by the first pressing member 5 and the second pressing member 6. The inner member 8 can be moved radially outward by applying an axial force to the axial contact portion 8a by the first pressing member 5 and the second pressing member 6.

The adjustment section 9 is a member that adjusts the radial position of the outer member 7 with respect to the inner member 8. The adjustment part 9 is located between the outer member 7 and the inner member 8. The adjustment section 9 adjusts the distance between the outer member 7 and the inner member 8. The adjustment portion 9 is, for example, a square pin that can be inserted between the outer reference surface 7b of the outer member 7 and the inner reference surface 8b of the inner member 8. The adjustment unit 9 adjusts the radial position of the outer reference surface 7b with respect to the inner reference surface 8b by inserting square pins having different widths between opposite sides when viewed from the axial direction between the outer member 7 and the inner member 8. adjust.

The outer member 7 and the inner member 8 are connected by a connecting member 10. The connecting members 10 are located on both end faces of the outer member 7 and the inner member 8 in the axial direction. Both ends of the outer member 7 in the axial direction are connected to the connecting member 10 by bolts or the like (not shown). Both ends of the inner member 8 in the axial direction are connected to the connecting member 10 by bolts or the like (not shown). Further, the inner member 8 and the outer member 7 are connected by a connecting member 10 with the adjusting portion 9 inserted between the outer member 7 and the inner member 8.

In this embodiment, one inner member 8 among the plurality of outer members 7 and one outer member 7 among the plurality of outer members 7 are connected by one connecting member 10 among the plurality of connecting members 10. That is, the positioning device 1 for the stator core 100 includes a plurality of outer members 7, inner members 8, and adjustment parts 9 connected by the connecting member 10. Further, a plurality of outer members 7, inner members 8, and adjustment portions 9 connected by the connecting member 10 are arranged in a plurality in the circumferential direction of the stator core 100. A plurality of outer members 7 lined up in the circumferential direction can each contact a plurality of teeth 103 located radially outward from the radial direction.

The guide member 11 is a member that guides the outer member 7, the inner member 8, and the adjustment portion 9, which are connected by the connecting member 10, in the radial direction. The guide member 11 is an annular plate member. The guide member 11 is located on the mounting table 2. On the guide member 11, a plurality of outer members 7, inner members 8, and adjustment portions 9, which are connected by a connecting member 10, are arranged side by side in the circumferential direction. The guide member 11 supports the outer member 7, the inner member 8, and the adjustment portion 9, which are connected by the connecting member 10, so as to be movable in the radial direction. In other words, the guide member 11 restricts the circumferential movement of the outer member 7, inner member 8, and adjustment portion 9 that are connected by the connecting member 10.

The positioning blade 12, which is a circumferential positioning member, positions the stator core 100 in the circumferential direction with respect to the outer member 7. The positioning blade 12 is a substantially rectangular plate member. The positioning blade 12 is located on the guide member 11 with its longitudinal direction facing the axial direction. The positioning blade 12 is connected to the outer member 7 with its short side facing in the radial direction. Thereby, the positioning blade 12 is positioned on the guide member 11 with its thickness direction facing the circumferential direction of the stator core 100 placed on the mounting table 2.

A plurality of positioning blades 12 are arranged side by side in the circumferential direction. The radially outward tip portion of the positioning blade 12 is located radially outwardly from the radial contact portion 7a of the outer member 7. The positioning blade 12 can be inserted between adjacent teeth 103 of the stator core 100 placed on the mounting table 2. Thereby, the positioning blade 12 positions the stator core 100 in the circumferential direction with respect to the outer member 7.

As shown in FIG. 3, in the outer member 7, 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 to the axial contact portion 8a of the inner member 8. If not, it is located at a released position P1 where it is not in contact with the stator core 100. As shown in FIG. 5, in the outer member 7, the second inclined surface 6a of the second pressing member 6 and the first inclined surface 5a of the first pressing member 5 touch the axial contact portion 8a of the inner member 8 in the axial direction. When the load is applied, the radial contact portion 7a of the outer member 7 is located at the positioning position P2 where it contacts the stator core 100. Further, when the outer member 7 is located at the release position P1, the adjusting portion 9 adjusts the position of the radial contact portion 7a of the outer member 7 with respect to the end surface 103a of the teeth 103.

The positioning device 1 for the stator core 100 configured in this manner positions a plurality of outer members 7, which are arranged in a row in the circumferential direction, to a release position P1 using the first pressing member 5 and the second pressing member 6. It is possible to move to position P2. The positioning device 1 for the stator core 100 is capable of positioning the radial position of the plurality of electromagnetic steel sheets 101 stacked in the thickness direction by moving the plurality of outer members 7 to the positioning position P2.

Next, using FIGS. 3 to 7, a method for manufacturing the stator core 100 in which the outer peripheral surface 102b of the stator core 100 is welded by a welding device (not shown) including the positioning device 1 for the stator core 100 according to the first embodiment. S100 will be explained. FIG. 5 is a cross-sectional view of a state in which the stator core 100 positioning device 1 is positioning the stator core 100. FIG. 7 is a flow diagram of a method for manufacturing a stator core according to an embodiment of the present invention.

As shown in FIG. 7, the manufacturing method S100 includes a measurement process S110, an adjustment process S120, a positioning process S130, and a welding process S140.

The measurement step S110 is a step of measuring the positions of the end surfaces 103a of the plurality of teeth 103 in the stator core 100 to which the outer peripheral surface 102b is welded. In the measurement step S110, the inner diameters of the plurality of welded stator cores 100 are measured.

The adjustment step S120 is a step in which the adjustment unit 9 adjusts the position of the outer member 7 with respect to the inner member 8 based on the already measured position of the radially inner end surface 103a of the teeth 103 in the plurality of stator cores 100. be. In the adjustment step S120, the position of each outer member 7 with respect to the inner member 8 is determined from the measured value of the inner diameter of the stator core 100 measured in the measurement step S110. For example, the outer member 7, which includes a portion of the stator core 100 after welding that has a large amount of radially inward distortion, is moved radially outward from the inner member 8. In the adjustment step S120, the position of the outer member 7 with respect to the inner member 8 is adjusted by replacing the square pin of the adjustment part 9.

The positioning step S130 is a step in which the outer member 7 applies a radially outward force to the plurality of teeth 103 in the stator core 100.

As shown in FIGS. 3 and 4, in the positioning step S130, the stator core 100 before welding is placed on the mounting table 2. Stator core 100 is positioned by positioning pins (not shown). Inside the through hole 105 of the stator core 100, a plurality of outer members 7, adjustment portions 9, and inner members 8, which are connected by a connecting member 10, are arranged side by side in the circumferential direction. Further, a positioning blade 12 is inserted between the plurality of teeth 103 of the stator core 100. Thereby, the circumferential position of the plurality of outer members 7, which are arranged side by side in the circumferential direction, with respect to the stator core 100 is determined. The outer member 7 is positioned at a position where the welding location 106 of the outer circumferential surface 102b of the stator core 100 is included in the circumferential range of the outer member 7. The outer member 7 is positioned at the release position P1.

As shown in FIGS. 5 and 6, the first pressing member 5 supported by the weight plate 4 moves toward the inner member 8 together with the weight plate 4. As shown in FIGS. Further, 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 of the inner member 8 on the first pressing member 5 side, an external force in the axial direction 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 of the inner member 8 on the second pressing member 6 side, an external force in the axial direction is applied to the inner member 8.

The axial contact portion 8a and the first inclined surface 5a convert the axial force exerted by the first pressing member 5 into a radial force as a direct-acting cam mechanism. Similarly, the axial contact portion 8a and the second inclined surface 6a convert the axial force of the second pressing member 6 into radial force as a direct-acting cam mechanism. Therefore, the first pressing member 5 and the second pressing member 6 move the outer member 7 together with the inner member 8 from the release position P1 to the radially outward positioning position P2 by applying a force in the axial direction to the inner member 8. let In other words, the first pressing member 5 and the second pressing member 6 apply an axial force to the inner members 8, which are arranged in a plurality in the circumferential direction. The members 7 are each moved radially outward.

Each radial contact portion 7a of the plurality of outer members 7 that has moved to the positioning position P2 contacts the end surface 103a of the plurality of teeth 103 located in the moving direction of each outer member 7, respectively. The radial contact portion 7a applies a radially outward force to the end surface 103a of the teeth 103. The outer member 7 corrects the circumferential position of the plurality of electromagnetic steel plates 101 stacked in the thickness direction. The radial position of each outer member 7 with respect to the inner member 8 is adjusted based on the measured values of the plurality of welded stator cores 100 measured in the measurement step S110. Therefore, each outer member 7 corrects each portion of the stator core 100 in the circumferential direction radially outward by an amount of correction corresponding to the amount of strain estimated in the stator core 100 due to welding.

The positioning device 1 for the stator core 100 applies weight to the stator core 100 on the mounting table 2 in the axial direction using the weight plate 4 . At this time, the stator core 100 is sandwiched between the weight plate 4 and the mounting table 2 while being positioned in the radial direction by the plurality of outer members 7 . A positioning device 1 for a stator core 100 holds the stator core 100, which has been positioned by a plurality of outer members 7, in a state where it is sandwiched between a weight plate 4 and a mounting table 2.

As shown in FIG. 7, the welding process S140 is a process of welding the outer peripheral surface 102b, which is the outer periphery of the stator core 100, while applying an axial force to the plurality of teeth 103. In the welding step S140, a welding device (not shown) welds the plurality of stacked electromagnetic steel plates 101 in the axial direction using a laser welding machine (not shown) or the like. The welding device sequentially welds a plurality of predetermined welding locations 106. At this time, the stator core 100 is corrected by the stator core 100 positioning device 1 into a shape that takes into account the distortion caused by welding. Thereby, deformation of stator core 100 due to welding can be appropriately suppressed.

When welding of the stator core 100 by a welding machine (not shown) is completed, the first pressing member 5 moves away from the inner member 8 together with the weight plate 4. At the same time, the second pressing member 6 supported by an actuator (not shown) moves in a direction away from the inner member 8. The inner member 8 is moved to the release position P1 by a tension spring or the like (not shown). The outer member 7, which is connected to the inner member 8, separates from the stator core 100.

In this way, the positioning device 1 for the stator core 100 according to the first embodiment corrects the radial positions of the teeth 103 in the plurality of stacked electromagnetic steel sheets 101 using the plurality of outer members 7, respectively. The plurality of outer members 7 are each movable in the radial direction by the moving mechanism 3. Furthermore, the position of the outer member 7 in the radial direction relative to the inner member 8 can be adjusted by the adjusting portion 9. That is, the positioning device 1 for the stator core 100 adjusts the position of each outer member 7 corresponding to the part of the stator core 100 based on the pressed shape of the through hole 105 of the stator core 100 and the amount of strain due to welding. It is possible. Thereby, the positioning device 1 of the stator core 100 is corrected into a shape according to the adjustment amount of the adjustment section 9. Thereby, it is possible to position the plurality of electromagnetic steel plates 101 in consideration of the shape and welding position of the electromagnetic steel plates 101.

Further, in the positioning device 1 for the stator core 100, a plurality of outer members 7, adjustment portions 9, and inner members 8 connected by a connecting member 10 are arranged in a line in the circumferential direction of the stator core 100. Therefore, each outer member 7 can maintain its position relative to the inner member 8. Furthermore, the positioning blade 12 positions the outer member 7 in the circumferential direction relative to the stator core 100 within a predetermined range. In other words, it is possible to position the electromagnetic steel sheet 101 at the same portion of the plurality of stator cores 100 with the same amount of correction.

Furthermore, the radial contact portions 7a located radially outward in the plurality of outer members 7 can come into contact with the end surfaces 103a of the plurality of teeth 103. The radius of curvature of the radial contact portion 7a is equal to the radius of curvature of the end surface 103a of the teeth 103. Therefore, the outer member 7 simultaneously applies a radial force to the end surfaces 103a of the plurality of teeth 103 facing the radial contact portion 7a. Therefore, the positioning device 1 for the stator core 100 can adjust the amount of correction of the electromagnetic steel sheet 101 by using the circumferential range of the radial contact portion 7a in the outer member 7 as one adjustment range.

The pin serving as the adjustment portion 9 is inserted between the outer member 7 and the inner member 8 to adjust the distance between the inner member 8 and the outer member 7 to be equal to the radial width of the pin. That is, the position of the outer member 7 with respect to the inner member 8 can be adjusted to an arbitrary interval by inserting a pin having an arbitrary width in the radial direction. Further, when a plurality of pins having different widths in the radial direction are inserted between the outer member 7 and the inner member 8, the outer member 7 adjusts the position of the outer member 7 with respect to the inner reference surface 8b of the inner member 8. It can be tilted circumferentially. Thereby, the plurality of electromagnetic steel plates 101 can be positioned in consideration of the shape and welding position of the electromagnetic steel plates 101.

The inner member 8 moves radially outward together with the outer member 7 by applying an axial force from the first pressing member 5 and the second pressing member 6 to the axial contact portion 8a, which is an inclined surface. Moreover, the inner member 8 is moved radially outward by applying force in the axial direction by the first inclined surface 5a of the first pressing member 5 and the second inclined surface 6a of the second pressing member 6. Move to. In other words, the positioning device 1 of the stator core 100 is based on the amount of strain caused by welding the plurality of outer members 7 to the plurality of electromagnetic steel plates 101 by moving the first pressing member 5 and the second pressing member 6 in the axial direction. Apply a radial force. Thereby, the plurality of electromagnetic steel plates 101 can be positioned in consideration of the shape and welding position of the electromagnetic steel plates 101.

[Other embodiments]
Although the embodiments of the present invention have been described above, the embodiments described above are merely examples for implementing the present invention. Therefore, without being limited to the embodiments described above, the embodiments described above can be modified and implemented as appropriate without departing from the spirit thereof.

In the embodiment described above, the radial contact portion 7a is the outer circumferential surface of the outer member 7 located radially outward. However, the radial contact portion may have any shape as long as it can press the radially inner end surface of the teeth 103. The radial contact portion may be, for example, a side located radially outward of an outer member having a flat outer circumferential surface.

In the embodiment described above, the moving mechanism 3 includes a weight plate 4, a first pressing member 5, and a second pressing member 6. However, the moving mechanism only needs to be able to move the outer member in the radial direction. The movement mechanism may be an actuator such as a motor or a cylinder that moves each outer member in a radial direction.

In the embodiment described above, the outer members 7 are arranged at six positions at equal intervals in the circumferential direction. However, the number and arrangement of outer members is not limited. The number and position of the outer members can be arbitrarily set in consideration of the welding locations and shape of the stator core.

In the above-described embodiment, a force is applied to the inner member 8 from one side in the axial direction by the first pressing member 5, and a force is applied from the other side in the axial direction by the second pressing member 6. However, the inner member may be subjected to an axial force by either the first pressing member or the second pressing member. In this case, the inner member only needs to have an axial contact portion at at least one of the axial end portions located at both ends in the axial direction.

In the embodiment described above, the inner member 8 has the axial contact portion 8a which is an inclined surface, the first pressing member 5 has the first inclined surface 5a, and the second pressing member 6 has the second inclined surface 6a. have. The inner member 8 moves in the radial direction when the first inclined surface 5a and the second inclined surface 6a contact the axial contact portion 8a from the axial direction. However, when the inner member has an axial contact portion, the second pressing member and the first pressing member do not need to have an inclined surface. Further, when the first pressing member has the first inclined surface and the second pressing member has the second inclined surface, the inner member does not need to have the inclined surface.

In the embodiment described above, one outer member 7 is connected to one inner member 8 by a connecting member 10 . However, a plurality of outer members may be connected to one inner member by a connecting member.

In the embodiment described above, the adjustment section 9 can adjust the distance between the outer member 7 and the inner member 8 using a pin. However, the adjustment mechanism only needs to be able to adjust the distance between the outer member 7 and the inner member 8. The adjustment mechanism may be configured to use, for example, shims, screws, or the like.

The present invention is applicable to the positioning device 1 for the stator core 100.

1 Stator core positioning device 2 Mounting table 3 Moving mechanism 4 Weight plate 5 First pressing member 6 Second pressing member 7 Outer member 7a Radial contact portion 8 Inner member 8a Axial contact portion 9 Adjustment portion 10 Connection member 11 Guide Member 12 Positioning blade 100 Stator core 101 Electromagnetic steel plate 102 Stator core body 102a Inner circumferential surface 102b Outer circumferential surface 103 Teeth 103a End surface

Claims (9)

A cylindrical structure in which a plurality of electromagnetic steel sheets having an annular stator core body and a plurality of teeth located on the inner peripheral side of the stator core body and extending radially inward are laminated in the thickness direction. A stator core positioning device for positioning the plurality of electromagnetic steel plates in a stator core,
an outer member that contacts a radially inner end surface of the plurality of teeth;
an inner member located radially inward of the stator core than the outer member;
an adjustment section located between the outer member and the inner member;
a moving mechanism that moves the inner member in the radial direction,
The adjustment section is
adjusting the radial position of the outer member relative to the inner member;
Stator core positioning device. The stator core positioning device according to claim 1,
The outer member, the inner member, and the adjustment section are
A plurality of them are lined up in the circumferential direction of the stator core,
Stator core positioning device. The stator core positioning device according to claim 1 or 2,
When the stator core is viewed in the stacking direction of the plurality of electromagnetic steel plates, the radius of curvature of the outer peripheral surface located on the radially outer side of the outer member is:
equal to the radius of curvature of the radially inner end surface of the teeth;
Stator core positioning device. The stator core positioning device according to any one of claims 1 to 3,
The adjustment section is
at least one pin insertable between the outer member and the inner member;
Stator core positioning device. The stator core positioning device according to any one of claims 1 to 4,
The inner member is
each having an inclined surface located radially inward of the stator core as it goes in the axial direction from at least one axial end of the axial ends located at both axial ends of the stator core;
The moving mechanism is
comprising at least one pressing member that applies a force in the axial direction to the inclined surface;
Stator core positioning device. The stator core positioning device according to any one of claims 1 to 5,
The moving mechanism is
a pressing member that applies a force in the axial direction of the stator core to the plurality of inner members;
The pressing member is
each has an inclined surface located radially outward of the stator core as it goes in a direction away from the inner member from at least one axial end of the axial ends located at both ends of the axial direction; , applying an axial force to the plurality of inner members by the inclined surface;
Stator core positioning device. The stator core positioning device according to any one of claims 1 to 6,
The outer member and the inner member are connected by a connecting member,
Stator core positioning device. The stator core positioning device according to any one of claims 1 to 7,
at least one circumferential positioning member located radially outward of the stator core than the outer member;
The circumferential positioning member is
having a width in the circumferential direction of the stator core that can be inserted between adjacent teeth in the stator core;
Stator core positioning device. A cylindrical structure in which a plurality of electromagnetic steel sheets having an annular stator core body and a plurality of teeth located on the inner peripheral side of the stator core body and extending radially inward are laminated in the thickness direction. A method for manufacturing a stator core by welding the outer circumference of the stator core, the method comprising:
a measuring step of measuring the position of each radially inner end surface of a plurality of teeth in a stator core whose outer periphery is welded;
an outer member that contacts a radially inner end surface of the plurality of teeth; an inner member that is located radially inward of the stator core than the outer member; and a radial position of the outer member with respect to the inner member. The position of the radially inner end surface of the plurality of teeth in the stator core, which has already been adjusted by a positioning position adjusting section having an adjusting section that adjusts the position and a moving mechanism that moves the inner member in the radial direction. An adjustment process based on
a positioning step of applying a radially outward force of the stator core to the radially inner end surfaces of the plurality of teeth;
a welding step of welding the outer periphery of the stator core while applying force to the plurality of teeth;
has,
Method of manufacturing stator core.

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