Jig, stator manufacturing device comprising jig, stator manufacturing method using jig, and motor manufacturing method

Abstract

A jig (20) comprises: a diameter expansion part (30) that expands, from the inside, the diameter defined by a plurality of split cores (1a) disposed in an annular shape; and a drive unit (40) that controls the movement of the diameter expansion part (30). The diameter expansion part (30) has: a first sleeve (31) and a second sleeve (32) that are provided on the outer circumference of a shaft (41) so as to be spaced apart in the axial direction and are capable of moving relative to the shaft (41) in the axial direction; a first link (33) that has one end (33a) pivotably supported by the first sleeve (31); a second link (34) that has one end (34a) pivotably supported by the second sleeve (32) and has the other end (34b) pivotably connected to the other end (33b) of the first link (33); and a pressing member (36) that is pivotably supported by the connection portion between the first link (33) and the second link (34). By driving the drive unit (40), the one end (33a) of the first link (33) and the one end (34a) of the second link (34) are moved toward or away from each other.

Description

Jig, stator manufacturing apparatus including the jig, stator manufacturing method using the jig, and motor manufacturing method

[0001] The present invention relates to a jig, a stator manufacturing apparatus including the jig, a stator manufacturing method using the jig, and a motor manufacturing method.

[0002] JP7302531B discloses a core expanding jig inserted inside a divided stator core for expanding the diameter of the divided stator core.

[0003] In the jig described in JP7302531B, when attempting to manufacture stators of different sizes (different inner diameters), it is necessary to manufacture a new jig corresponding thereto.

[0004] The present invention has been made in view of such technical problems, and an object of the present invention is to provide a jig capable of expanding the diameter of a stator even when stators constituted by divided cores have different inner diameters.

[0005] According to one aspect of the present invention, a jig used for manufacturing a stator includes: a diameter expanding portion that expands the diameter of a plurality of divided cores arranged in an annular shape from the inside; and a driving portion that controls movement of the diameter expanding portion. The diameter expanding portion is provided on the outer circumference of a shaft with intervals in the axial direction, and includes a first sleeve and a second sleeve, at least one of which is relatively movable in the axial direction with respect to the shaft, a first link having one end rotatably supported by the first sleeve, a second link having one end rotatably supported by the second sleeve and the other end rotatably connected to the other end of the first link, and a pressing member rotatably supported at a connecting portion between the other end of the first link and the other end of the second link. The first link, the second link, and the pressing member are provided in plurality at intervals in the circumferential direction corresponding to the plurality of divided cores, and one end of the first link and one end of the second link are moved toward or away from each other by driving of the driving portion.

[0006] This is a schematic cross-sectional view of a motor using the stator according to this embodiment. This is a plan view of the stator according to this embodiment. This is an external view of the jig according to this embodiment. This is a schematic cross-sectional view in the axial direction showing the jig according to this embodiment inserted inside a plurality of segmented cores, showing the state in which the pressing member has released pressure on the inner circumferential surface of the segmented cores. This is a schematic cross-sectional view in the axial direction showing the jig according to this embodiment inserted inside a plurality of segmented cores, showing the state in which the pressing member is pressing on the inner circumferential surface of the segmented cores. This is a flowchart showing the manufacturing process of the stator according to this embodiment.

[0007] Embodiments of the present invention will be described below with reference to the attached drawings.

[0008] First, with reference to Figures 1 and 2, the configuration of a motor M to which a stator 1 manufactured by the manufacturing method of the stator 1 according to an embodiment of the present invention is applied will be briefly described. Figure 1 is a cross-sectional view showing the schematic configuration of the motor M. Figure 2 is a plan view of the stator 1.

[0009] The motor M comprises a stator 1, a rotor R arranged coaxially with the stator 1, and a case C that houses the stator 1 and the rotor R. The stator 1 and rotor R have a substantially annular shape, and the stator 1 is arranged to surround the outer circumference of the rotor R. A rotating shaft L is attached to the center of the rotor R, and the rotating shaft L is rotatably supported in the case C via bearings.

[0010] Motor M can be mounted on a vehicle, for example. Motor M can operate as an electric motor that rotates using power supplied from a battery. Furthermore, when the rotor R receives rotational energy from the drive wheels, Motor M can function as a generator and charge the battery. Motor M may be used as either an electric motor or a generator. Motor M can also be mounted on various devices other than vehicles.

[0011] The stator 1 is an inner rotor type and is fixed to the inner circumferential surface of the cylindrical portion of the case C. The stator 1 comprises a plurality of segmented cores 1a arranged in an annular shape, and coils 1c arranged on each tooth 1b (see Figure 2, etc.) of the segmented cores 1a.

[0012] In this embodiment, the stator 1 is composed of 12 segmented cores 1a. The stator 1 is formed by arranging 12 segmented cores 1a, around which a coil 1c is wound, in a ring shape, and joining the circumferential ends of the segmented cores 1a to each other by welding. The segmented cores 1a are composed of laminated steel plates in which electromagnetic steel sheets are stacked in the axial direction of the stator 1.

[0013] As shown in Figure 2, in the stator 1 of this embodiment, correlation insulating paper 60 is inserted between adjacent divided cores 1a as an insulating material.

[0014] The rotor R has a plurality of permanent magnets E arranged at equal intervals in the circumferential direction. The rotor R rotates around the rotation axis L due to the reaction force of the permanent magnets E generated by the rotational magnetic flux supplied from the coil 1c of the stator 1.

[0015] Next, the manufacturing apparatus 100 for the stator 1, used in the manufacture of the stator 1, will be described with reference to Figures 3 to 5. Note that Figures 3 to 5 show only a part of the manufacturing apparatus 100 for the stator 1. Specifically, Figures 3 to 5 show the apparatus (jig 20) used in the manufacturing process shown in steps S2 to S6 of Figure 6, which will be described later. Hereafter, the manufacturing apparatus 100 for the stator 1 will be simply referred to as "manufacturing apparatus 100".

[0016] The manufacturing apparatus 100 includes an air cylinder 10 (see Figures 4 and 5) which serves as an external shape holding part that holds a plurality of divided cores 1a from the outside when the divided cores 1a are arranged in a ring shape, and a jig 20 for expanding the diameter of the plurality of divided cores 1a arranged in a ring shape from the inside.

[0017] The air cylinders 10 are provided corresponding to each segmented core 1a (12 in this embodiment). Each air cylinder 10 comprises a reciprocating rod 11 and a pressing plate 12 attached to the end of the rod 11. When compressed air is supplied to the air cylinder 10, the rod 11 extends and presses the segmented core 1a radially inward via the pressing plate 12 attached to the end of the rod 11.

[0018] As shown in Figures 3 to 5, the jig 20 includes an expanding section 30 that expands the diameter of a plurality of annularly arranged segmented cores 1a from the inside, and a drive section 40 that controls the movement of the expanding section 30.

[0019] As shown in Figures 4 and 5, the enlarged diameter portion 30 has a first sleeve 31 and a second sleeve 32. The first sleeve 31 and the second sleeve 32 are provided on the outer circumference of the shaft 41 with an axial gap between them. Furthermore, the first sleeve 31 and the second sleeve are mounted so as to be able to move relative to each other. The first sleeve 31 and the second sleeve 32 have a first link 33, one end 33a of which is rotatably supported by the first sleeve 31, and a second link 34, one end 34a of which is rotatably supported by the second sleeve 32, and the other end 34b of which is rotatably connected to the other end 33b of the first link 33. Furthermore, the enlarged diameter portion 30 has a pressing member 36 rotatably supported by a connecting portion 35 which is the connecting portion between the other end 33b of the first link 33 and the other end 34b of the second link 34, and a spring 37 which is a biasing member for biasing the pressing member 36. The first link 33, the second link 34, and the pressing member 36 are provided in multiples, spaced apart in the circumferential direction, corresponding to each of the multiple divided cores 1a. Note that when one end 33a of the first link 33 is rotatably supported by the first sleeve 31, it means that the first link 33 and the first sleeve 31 are connected in a way that allows for relative rotation, enabling the transmission of force between them. Similarly, when one end 34a of the second link 34 is rotatably supported by the second sleeve 32, it means that the second link 34 and the second sleeve 32 are connected in a way that allows for relative rotation, enabling the transmission of force between them.

[0020] As shown in Figures 4 and 5, the first sleeve 31 is made of a cylindrical metal member. The first sleeve 31 is provided with a slit 31a on one end into which one end 33a of the first link 33 is inserted, and a recess 31b on the other end that accommodates the female thread member 31c, which will be described later. Multiple slits 31a are provided at intervals in the circumferential direction.

[0021] The first link 33 is made of a metal rod-shaped member. One end 33a of the first link 33 is inserted into the slit 31a and is rotatably supported within the slit 31a.

[0022] The second sleeve 32 is made of a cylindrical metal member. The second sleeve 32 is provided with a slit 32a on one end into which one end 34a of the second link 34 is inserted, a recess 32b on the other end that accommodates the female thread member 32c described later, and a slit 32d on the outer circumference of the recess 32b into which one end of the spring 37 is inserted. The slits 32a and 32d are arranged side by side in the axial direction. In addition, multiple slits 32a and 32d are provided at intervals in the circumferential direction.

[0023] The second link 34 is made of a metal rod-shaped member. One end 34a of the second link 34 is inserted into the slit 32a and is supported so as to be rotatable within the slit 32a.

[0024] The connecting portion 35 is made up of a pin with a circular cross-section. The connecting portion 35 rotatably connects the other end 33b of the first link 33 and the other end 34b of the second link 34.

[0025] The pressing member 36 is made of a metal rod-shaped member. The pressing member 36 has a slit 36a at one end and a slit 36b at the other end. The connecting portion 35 of the first link 33 and the second link 34 is inserted into the slit 36a. The pressing member 36 is then rotatably supported by the connecting portion 35 with respect to the first link 33 and the second link 34. The other end of the spring 37 is inserted into the slit 36b.

[0026] The spring 37 is supported at one end within the slit 32d of the second sleeve 32 and at the other end within the slit 36b of the pressing member 36. The spring 37 biases the tip side of the pressing member 36 in the insertion direction (the downward side in Figures 3 to 5) to pull radially inward. This prevents the pressing member 36 from getting caught on the divided core 1a when it is inserted into the divided core 1a which is arranged in an annular shape. In addition, the spring 37 prevents the pressing member 36 from flapping around.

[0027] As shown in Figures 4 and 5, the drive unit 40 includes a shaft 41, a first male threaded portion 41a formed on the outer circumference of the shaft 41, a second male threaded portion 41b formed on the outer circumference of the shaft 41 at an axial distance from the first male threaded portion 41a, a female threaded member 31c provided on the first sleeve 31 and having a female thread formed to screw into the first male threaded portion 41a, a female threaded member 32c provided on the second sleeve 32 and having a female thread formed to screw into the second male threaded portion 41b, and an electric motor 42 that rotates the shaft 41.

[0028] In this embodiment, the shaft 41 is the drive shaft of the electric motor 42. The electric motor 42 is mounted on the frame 50 such that the shaft 41 passes through the frame 50. The frame 50 is also provided with a plurality of rods 51 running parallel to the shaft 41. The rods 51 are inserted through an annular ring member 53 fixed to the outer circumference of the first sleeve 31. As a result, the rods 51 function as anti-rotation devices and guides for the first sleeve 31 (female thread member 31c). Furthermore, since the first sleeve 31 and the second sleeve 32 are connected via the first link 33 and the second link 34, the rods 51 also function as anti-rotation devices for the second sleeve 32 (female thread member 32c).

[0029] The female thread member 31c is made of a cylindrical member separate from the first sleeve 31. The female thread member 31c is housed in a recess 31b provided in the first sleeve 31 and is fixed to the first sleeve 31 so as not to rotate relative to it. The first plate 54 is attached to the first sleeve 31 so as to close the recess 31b. Note that the first sleeve 31 and the female thread member 31c may be made of a single member.

[0030] The female thread member 32c is made of a cylindrical member separate from the second sleeve 32. The female thread member 32c is housed in a recess 32b provided in the second sleeve 32 and is fixed to the second sleeve 32 so as not to rotate relative to it. The second plate 55 is attached to the second sleeve 32 so as to close the recess 32b. The second sleeve 32 and the female thread member 32c may be made of a single member.

[0031] In this embodiment, the first male thread portion 41a, the second male thread portion 41b, the female thread of the female thread member 31c, and the female thread of the female thread member 32c are configured to be reverse threads relative to each other.

[0032] As shown in Figures 4 and 5, a spring 37 is provided between the first sleeve 31 and the second sleeve 32, biasing the first sleeve 31 and the second sleeve 32 in a direction that separates them from each other. This makes it possible to suppress looseness in the engagement between the first male thread portion 41a and the female thread member 31c, and looseness in the engagement between the second male thread portion 41b and the female thread member 32c.

[0033] Next, the operation of the jig 20 will be explained along with the manufacturing method of the stator 1, with reference to Figure 6. Figure 6 is a flowchart showing the flow of the manufacturing method of the stator 1.

[0034] First, the winding process is performed as step S1. In the winding process, a winding device (not shown) is used to wind the wire around the teeth 1b of the divided core 1a. The winding method is a general one, so its explanation is omitted here.

[0035] Next, the holding process is performed as step S2. In the holding process, the divided cores 1a are arranged in a ring shape in the manufacturing apparatus 100, and compressed air is supplied to the air cylinder 10. As a result, the rod 11 of the air cylinder 10 extends, and each divided core 1a is pressed from the outside by the pressing plate 12 attached to the rod 11. As a result, the multiple divided cores 1a are held in a ring shape so that adjacent divided cores 1a press against each other.

[0036] Next, step S3 is performed as the jig insertion step. In the jig insertion step, the enlarged diameter portion 30 (pressing member 36) of the jig 20 is inserted inside the multiple divided cores 1a that were held in the holding step (as shown in Figure 4).

[0037] Next, step S4 is performed, which is a diameter expansion process. In the diameter expansion process, the pressing member 36 of the jig 20 is pressed against the inner circumferential surface of the divided core 1a to expand the diameter of the divided core 1a. The diameter expansion process will now be explained in detail.

[0038] In the diameter expansion process, the electric motor 42 is first rotated in the forward direction. This causes the shaft 41 to rotate in the forward direction, and the first male thread portion 41a and the second male thread portion 41b provided on the outer circumferential surface of the shaft 41 to rotate in the forward direction. In this embodiment, "forward rotation" refers to the direction of rotation of the electric motor 42 and the shaft 41 when the pressing member 36 of the jig 20 is pressed against the inner circumferential surface of the divided core 1a. "Reverse rotation," which will be described later, refers to the direction of rotation opposite to "forward rotation," and refers to the direction of rotation of the electric motor 42 and the shaft 41 when the pressing member 36 of the jig 20 releases pressure on the divided core 1a.

[0039] As described above, the rod 51 prevents the first sleeve 31 (female thread member 31c) and the second sleeve 32 (female thread member 32c) from rotating. Therefore, the first sleeve 31 and the second sleeve 32 do not rotate with the rotation of the shaft 41, but move in the axial direction of the shaft 41 due to the action of the screw.

[0040] As described above, the female threads of the female thread member 31c and the female thread member 32c are configured as reverse threads. Therefore, when the electric motor 42 is rotated forward, the female thread member 31c moves downward in Figures 4 and 5, and the female thread member 32c moves upward in Figures 4 and 5. In other words, in the jig 20 of this embodiment, when the electric motor 42 is rotated forward, the first sleeve 31 (female thread member 31c) and the second sleeve 32 (female thread member 32c) move in a direction toward each other. As a result, one end 33a of the first link 33 attached to the first sleeve 31 and one end 34a of the second link 34 attached to the second sleeve 32 move toward each other. Consequently, the connecting portion 35 of the first link 33 and the second link 34 moves radially outward, and the pressing member 36 supported by the connecting portion 35 also moves radially outward.

[0041] When the electric motor 42 is rotated further forward, the pressing member 36 supported by the connecting portion 35 moves further radially outward and comes into contact with the inner circumferential surface of the divided core 1a (as shown in Figure 5). When the pressing force applied by the pressing member 36 to the divided core 1a exceeds the pressing force applied by the air cylinder 10, the divided core 1a moves radially outward, creating a small gap between adjacent divided cores 1a. The electric motor 42 is stopped when such a gap occurs. At this time, the divided core 1a is held in place by being sandwiched between the pressing plate 12 of the air cylinder 10 and the pressing member 36.

[0042] Next, step S5 is performed as the insulating material insertion step. In the insulating material insertion step, the correlated insulating paper 60 is inserted into the gap created between adjacent divided cores 1a during the diameter expansion step. The insertion of the correlated insulating paper 60 is performed by a device (not shown) that grips and inserts the correlated insulating paper 60.

[0043] Next, step S6 is performed as a release step. In the release step, the pressure on the inner circumferential surface of the divided core 1a by the pressing member 36 is released. Specifically, the electric motor 42 is reversed. As a result, the shaft 41 is reversed, and the first male thread portion 41a and the second male thread portion 41b provided on the outer circumferential surface of the shaft 41 are also reversed.

[0044] As described above, since the internal thread of the female screw member 31c and the internal thread of the female screw member 32c are formed as reverse threads to each other, reversing the electric motor 42 causes the female screw member 31c to move upward in FIGS. 4 and 5 as the shaft 41 rotates, and the female screw member 32c to move downward in FIGS. 4 and 5. That is, in the jig 20 of the present embodiment, reversing the electric motor 42 moves the first sleeve 31 (female screw member 31c) and the second sleeve 32 (female screw member 32c) in directions away from each other. Accordingly, one end 33a of the first link 33 attached to the first sleeve 31 and one end 34a of the second link 34 attached to the second sleeve 32 are separated from each other. As a result, the connecting portion 35 of the first link 33 and the second link 34 moves radially inward, and the pressing member 36 supported by the connecting portion 35 also moves radially inward. This releases the pressing of the inner peripheral surface of the split core 1a by the pressing member 36.

[0045] In this way, when the pressing of the inner peripheral surface of the split core 1a by the pressing member 36 is released, the split core 1a moves radially inward by the pressing force of the air cylinder 10, and the phase insulating paper 60 inserted into the gap between adjacent split cores 1a is clamped between the side surfaces of the adjacent split cores 1a.

[0046] When the first link 33, the second link 34, and the pressing member 36 return to their initial positions, the electric motor 42 is stopped. Thereafter, the enlarged diameter portion 30 (pressing member 36) of the jig 20 is taken out from the plurality of split cores 1a.

[0047] Next, a welding step is performed as step S7. In the welding step, adjacent split cores 1a are welded and integrated, whereby the stator 1 is completed.

[0048] As described above, the jig 20 of the present embodiment adjusts the radial position of the pressing member 36 supported by the connecting portion (connecting part 35) between the first link 33 and the second link 34 by moving one end 33a of the first link 33 supported by the first sleeve 31 and one end 34a of the second link 34 supported by the second sleeve 32 toward or away from each other. Accordingly, even if the inner diameter of the stator 1 changes, the pressing member 36 can press against the inner circumferential surface of the divided core 1a to expand the diameter of the stator 1.

[0049] In the above embodiment, the case where the jig 20 includes the female screw member 31c and the female screw member 32c has been described as an example, but the present invention is not limited thereto. For example, the female screw member 31c may be omitted. In this case, the first sleeve 31 is immovably fixed to the rod 51. Accordingly, when the shaft 41 is rotated forward and backward, the second sleeve 32 (the female screw member 32c) moves in the axial direction, so the pressing member 36 can be moved in the radial direction.

[0050] Furthermore, in the above modified example, instead of the configuration in which the shaft 41 is rotated by the electric motor 42, the shaft 41 may be driven in the axial direction. In this case, the second sleeve 32 is fixed to the shaft 41. Accordingly, by moving the shaft 41 in the axial direction, the second sleeve 32 (the female screw member 32c) can be moved in the axial direction.

[0051] In the above embodiment, the case where the jig 20 is used when inserting the phase insulating paper 60 between divided cores 1a has been described as an example, but the present invention is not limited thereto. The jig 20 can be used when it is necessary to expand the diameter of a plurality of annularly arranged divided cores 1a. Note that the "annularly arranged divided cores 1a" in the present embodiment includes not only the case where adjacent divided cores 1a are arranged in contact with each other, but also the case where the divided cores 1a are arranged annularly at intervals.

[0052] The configuration, operation, and effects of the embodiment of the present invention configured as described above will be collectively described.

[0053] The jig 20 of this embodiment includes an expanding section 30 that expands the diameter of a plurality of annularly arranged segmented cores 1a from the inside, and a drive section 40 that controls the movement of the expanding section 30. The expanding section 30 is provided on the outer circumference of the shaft 41 at axial intervals and includes a first sleeve 31 and a second sleeve 32, at least one of which is axially movable relative to the shaft 41, a first link 33 with one end 33a rotatably supported by the first sleeve 31, and a second sleeve 33 with one end 34a rotatably supported by the second sleeve 32. The first link 33, second link 34, and pressing member 36 are provided in multiple units spaced apart in the circumferential direction to correspond to a plurality of segmented cores 1a. Driven by the drive unit 40, one end 33a of the first link 33 and one end 34a of the second link 34 move closer together or further apart. When one end 33a of the first link 33 and one end 34a of the second link 34 move closer together, the pressing member 36 presses against the inner circumferential surfaces of the plurality of segmented cores 1a. Conversely, when one end 33a of the first link 33 and one end 34a of the second link 34 move further apart, the pressing member 36 releases pressure on the inner circumferential surfaces of the plurality of segmented cores 1a.

[0054] With this configuration, the radial position of the pressing member 36 supported at the connecting portion (connecting portion 35) between the first link 33 and the second link 34 can be adjusted by moving one end 33a of the first link 33 supported by the first sleeve 31 and one end 34a of the second link 34 supported by the second sleeve 32 closer together or further apart. As a result, even if the inner diameter of the stator 1 changes, the pressing member 36 can press against the inner circumferential surface of the divided core 1a, thereby expanding the diameter of the stator 1.

[0055] Furthermore, in the jig 20, the drive unit 40 includes a shaft 41, a first male threaded portion 41a formed on the outer circumference of the shaft 41, a second male threaded portion 41b formed on the outer circumference of the shaft 41 at an axial distance from the first male threaded portion 41a, a female threaded member 31c (first female threaded portion) provided on the first sleeve 31 and screwed into the first male threaded portion 41a, and a female threaded member 32c (second female threaded portion) provided on the second sleeve 32 and screwed into the second male threaded portion 41b The device has a female threaded portion and an electric motor 42 that rotates the shaft 41. The female threaded member 31c (first female threaded portion) and the female threaded member 32c (second female threaded portion) are configured with reverse threads. When the electric motor 42 rotates the shaft 41 forward, the first sleeve 31 and the second sleeve 32 move closer together, and when the electric motor 42 rotates the shaft 41 in the reverse direction, the first sleeve 31 and the second sleeve 32 move further apart.

[0056] With this configuration, by moving the first sleeve 31 and the second sleeve 32 by the same distance, the radial position of the connecting portion (connecting portion 35) between the first link 33 and the second link 34 can be changed without changing the axial position of the connecting portion (connecting portion 35). In other words, when the electric motor 42 is driven, only the radial position of the pressing member 36 can be changed. Therefore, with this configuration, the position of the pressing member 36 does not change when the expanding portion 30 of the jig 20 is expanded and when it is contracted, making it easy to set the position when inserting the expanding portion 30 (pressing member 36) of the jig 20 into the inside of the multiple divided cores 1a. Since the movement of the pressing member 36 can be controlled by driving a single electric motor 42, the jig 20 can be simplified.

[0057] In the jig 20, the enlarged diameter portion 30 further includes a spring 37 biasing member that biases the tip side of the pressing member 36 in the insertion direction radially inward.

[0058] This configuration prevents the pressing member 36 of the jig 20 from getting caught on the divided cores 1a when it is inserted into the inside of the divided cores 1a. As an example of a biasing member, a spring 37 is shown, but it is not limited to this, and an elastic member such as resin, or a leaf spring other than a coil spring may also be used.

[0059] The manufacturing apparatus 100 for the stator 1 includes a jig 20 and an air cylinder 10 (outer shape holding part) that holds the plurality of divided cores 1a from the outside when the plurality of divided cores 1a are arranged in a ring shape, and the air cylinder 10 (outer shape holding part) allows the divided cores 1a to move when the pressing member 36 presses the inner circumferential surface of the divided cores 1a.

[0060] With this configuration, an external force can be applied to the multiple segmented cores 1a from the outside by the air cylinder 10 (outer shape holding part), while creating a gap for inserting the correlation insulating paper 60. As a result, after inserting the correlation insulating paper 60, the multiple segmented cores 1a can be immediately pressed, thereby preventing the correlation insulating paper 60 from falling out.

[0061] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0062] Although the example described uses an air cylinder 10 as the external shape holding part that holds the divided core 1a from the outside, an electric actuator or hydraulic cylinder may also be used.

[0063] This application claims priority under Japanese Patent Application No. 2025-51246, filed with the Japan Patent Office on 26 March 2025, and all contents of that application are incorporated herein by reference.

Claims

1. A jig used in the manufacture of a stator, comprising: an expanding section for expanding the diameter of a plurality of segmented cores arranged in an annular shape from the inside; and a drive section for controlling the movement of the expanding section, wherein the expanding section comprises: a first sleeve and a second sleeve provided on the outer circumference of a shaft at axial intervals and at least one of which is axially movable relative to the shaft; a first link with one end rotatably supported by the first sleeve; a second link with one end rotatably supported by the second sleeve and the other end rotatably connected to the other end of the first link; and a pressing member rotatably supported at the connection portion between the other end of the first link and the other end of the second link, wherein the first link, the second link, and the pressing member are provided in a plurality at circumferential intervals corresponding to the plurality of segmented cores, and the drive section causes the one end of the first link and the one end of the second link to approach or separate.

2. The jig according to claim 1, wherein the drive unit comprises: the shaft; a first male threaded portion formed on the outer circumference of the shaft; a second male threaded portion formed on the outer circumference of the shaft at an axial distance from the first male threaded portion; a first female threaded portion provided on the first sleeve and screwed into the first male threaded portion; a second female threaded portion provided on the second sleeve and screwed into the second male threaded portion; and an electric motor for rotationally driving the shaft, wherein the first female threaded portion and the second female threaded portion are configured with opposite threads to each other; the first sleeve and the second sleeve move closer together when the shaft is rotated forward by the electric motor, and the first sleeve and the second sleeve move further apart when the shaft is rotated backward by the electric motor.

3. The jig according to claim 1, wherein the enlarged diameter portion further comprises a biasing member that biases the tip side of the pressing member in the insertion direction toward the radially inward direction.

4. A stator manufacturing apparatus comprising a jig as described in any one of claims 1 to 3, and an outer shape holding part that holds the plurality of divided cores from the outside when the plurality of divided cores are arranged in a ring, wherein the outer shape holding part allows the movement of the divided cores when the pressing member presses the inner circumferential surface of the divided cores.

5. A method for manufacturing a stator using a jig described in any one of claims 1 to 3, comprising: a holding step of arranging a plurality of segmented cores in a ring and holding the plurality of segmented cores from the outside; an insertion step of inserting the plurality of pressing members into the inside of the plurality of segmented cores held in the holding step; an expansion step of driving the drive unit to press the pressing members against the inner circumferential surface of the segmented cores and expand the diameter of the plurality of segmented cores; and an insulating material insertion step of inserting insulating material between adjacent segmented cores that have been expanded in the expansion step.

6. A method for manufacturing a stator according to claim 5, further comprising a welding step of welding adjacent divided cores together after the completion of the insulating material insertion step.

7. A method for manufacturing a motor having a stator, wherein the stator is manufactured using the method for manufacturing a stator described in claim 5.

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