JP2022074406A - Stator manufacturing device - Google Patents

Abstract

To provide a stator manufacturing device which improves the quality of a stator by reducing a welding defect during stator coil formation.SOLUTION: A stator manufacturing device comprises a clamp jig 40 for welding tip ends 34 which protrude from an end face of a substantially annular stator core 20 and are adjacent to each other in a radial direction, with each other in a segment coil 31 inserted into a slot 23 of the stator core 20. In the stator manufacturing device, the clamp jig 40 clamps the tip ends 34 while extending in the radial direction of the stator core 20 and includes: a plurality of positioning protrusions 43 which are formed while being separated in the radial direction and protruding in a circumferential direction and crimp the tip end 34 between the mutually adjacent protrusions; and an induction part 44 which extends from lower ends of the positioning protrusions 43 and in which an inclined plane 44a inclined in the circumferential direction is formed so as to be tapered from a proximal end side to a distal end side of the positioning protrusions 43.SELECTED DRAWING: Figure 4

Description

The present invention relates to a stator manufacturing apparatus.

The stator of the motor has an annular stator core and a stator coil. The stator is manufactured by inserting a substantially U-shaped segment coil into the slot of the stator core and electrically connecting the tips of the segment coils on the lead portion side, which are formed linearly, to form a stator coil. Will be done. The insulating film at the tip of the segment coil is peeled off in advance, and the corresponding tips are joined to each other by welding or the like. When performing welding, a method is known in which a coil is clamped and aligned with a clamping jig so that the tips to be joined are close to each other, and arc welding is performed.

In Patent Document 1, in a stator manufacturing method in which a segment is inserted into a stator core and the end portion of the lead portion is welded to form a segment coil, the lead portion of the segment inserted into the stator core is peeled off. When the tip portion is gripped by a clamping jig extending in the radial direction of the stator core and the tip portions are welded to each other, the welding region and the stator on the side where the end portion of the tip portion is arranged by the clamping jig Manufacture of a stator that cools the lead part by blowing gas to the lead part on the cooling area side by a ventilation path that is a cooling means provided in the clamp jig, separated from the cooling area on the side where the core is placed. The method and the stator manufacturing apparatus are disclosed.

Japanese Unexamined Patent Publication No. 2014-107876

However, in the technique described in Patent Document 1, when the coil is gripped by the clamp jig, the positions of the tip portions to be joined or the positions of the clamp jig and the gripped coil deviate from the desired positions. Unnecessary gaps may be formed. In addition, the positional relationship between the welding torch that generates an arc and the tip portion may shift. If welding is performed between the tips while such a misalignment occurs, there is a problem that welding defects are caused.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a stator manufacturing apparatus that reduces welding defects at the time of forming a stator coil and improves the quality of the stator. ..

The stator manufacturing apparatus according to one embodiment includes a stator manufacturing device including a clamp jig that protrudes from the end face of the stator core and welds adjacent tip portions in the radial direction among the segment coils inserted in the slots of the substantially annular stator core. In the device, the clamping jig extends in the radial direction of the stator core to clamp the tip portion, is separated in the radial direction and is formed to protrude in the circumferential direction, and the tip portion is sandwiched between adjacent ones. A guide portion that extends from a plurality of positioning protrusions and the lower end of the positioning protrusions and forms an inclined surface that is inclined in the circumferential direction so as to taper from the base end side to the tip end side of the positioning protrusions. And have.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a stator manufacturing apparatus that reduces welding defects at the time of forming a stator coil and improves the quality of the stator.

It is a perspective view which shows the stator manufactured by using the stator manufacturing apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the state of performing the welding of the tip part by the stator manufacturing apparatus which concerns on Embodiment 1. FIG. It is a front view which shows the clamp jig provided in the stator manufacturing apparatus which concerns on Embodiment 1. FIG. It is a perspective view which shows the main part of FIG. It is a figure which shows the state that the clamp jig provided in the stator manufacturing apparatus which concerns on Embodiment 1 is arranged above the tip part. It is a figure which shows the mode that the clamp jig provided in the stator manufacturing apparatus which concerns on Embodiment 1 and a tip portion are brought into close contact with each other. It is a figure which shows the state that the tip part was aligned with the clamp jig provided in the stator manufacturing apparatus which concerns on Embodiment 1. FIG. It is a perspective view which shows the main part of the clamp jig of the comparative example. It is a figure which compares the state in which the tip portion is clamped to each of the clamp jig provided in the stator manufacturing apparatus which concerns on Embodiment 1 and the clamp jig of the comparative example.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are appropriately simplified.

First, a stator manufactured by using the stator manufacturing apparatus according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the stator 1 has a stator core 20 and a stator coil 30. The stator 1 constitutes a part of the motor by assembling a rotor in the stator 1.

The stator core 20 is formed by, for example, laminating a plurality of electromagnetic steel sheets formed in a substantially annular shape by punching and connecting them in the axial direction by caulking. Ribs 21 and bolt holes 22 for attaching to the motor case are provided on the outer peripheral portion of the substantially annular stator core 20.

Further, in the stator core 20, a plurality of slots 23 bored in the radial direction from the inner peripheral surface of the stator core 20 are formed at equal intervals in the circumferential direction. The slot 23 extends in the axial direction and opens to the upper end surface 24 and the lower end surface 25 existing in the axial direction of the stator core 20, and also opens to the inner peripheral side. In the slot 23, an insulating paper 26 for insulating the stator core 20 and the stator coil 30 is arranged as needed.

The stator coil 30 is formed by electrically connecting a segment coil 31 inserted in a slot 23 of the stator core 20 by stacking a plurality of layers in the radial direction. The stator coil 30 is formed, for example, by the following procedure.

First, the segment coil 31 is formed in a substantially U shape by edgewise bending a single flat wire. The flat wire is a conductor having a rectangular cross section coated with an insulating film such as enamel. Further, the segment coil 31 is composed of a pair of lead portions 32 formed in a straight line and a connecting portion 33 connecting the pair of lead portions 32 to each other, and has a U-shape.

At each tip of the pair of lead portions 32, a tip portion 34 from which the insulating film has been peeled off is formed. The tip portion 34 is a portion where the insulating coating is peeled off by cutting or the like so that the conductor is exposed from each tip of the segment coil 31 to a predetermined position. In the portion of the segment coil 31 other than the tip portion 34, the conductor is coated with an insulating coating in order to ensure insulation with the adjacent coil end portion 35.

In the segment coil 31 inserted into the slot 23, the lead portion 32 side protrudes from the upper end surface 24 of the stator core 20 to form one coil end portion 35. The coil end portion 35 includes a lead portion 32a, which is a portion of the lead portion 32 protruding from the upper end surface 24 of the stator core 20, and a tip portion 34. Then, the gap between the coil end portions 35 adjacent in the radial direction is expanded in the radial direction by using an expansion jig. After that, the coil end portion 35 is twist-formed in the circumferential direction in order to join the in-phase tip portions 34 inserted into different slots 23.

For example, as shown in FIG. 1, in the stator 1 of a three-phase, eight-pole motor, 48 slots 23 are formed in the circumferential direction, and segment coils 31 having the same phase are inserted every 6 slots. Therefore, when eight segment coils 31 are stacked in one slot 23 in the radial direction, the coil end portions 35 of the four segment coils 31 arranged in every other layer are twisted to one side in the circumferential direction. Is molded.

Further, of the eight segment coils 31 laminated in the radial direction, the coil end portion 35 of the remaining four segment coils 31 is twist-formed to the other side in the circumferential direction. The twist-formed coil end portion 35 has a tip portion 34 extending in the axial direction and a part of a lead portion 32 (lead portion 32a) covered with an insulating film inclined to one side or the other side in the circumferential direction. It is composed of and. As a result, a plurality of in-phase tip portions 34 separated by 6 slots are arranged along the radial direction.

The heights of the coil end portions 35 after being twist-formed in each axial direction are substantially the same, and four pairs of tip portions 34 consisting of one pair and two are aligned from the inner peripheral side to the outer peripheral side. The length of each segment coil 31 is appropriately designed so that the molded coil end portion 35 is in such an aligned state, and radial expansion and torsion molding are performed with respect to the coil end portion 35.

The stator coil 30 is formed by welding and joining a pair of tip portions 34 adjacent to each other in the radial direction with respect to the work of the torsionally formed stator 1. Further, the joined tip portion 34 is insulated by powder coating using an insulating resin. Further, by impregnating the stator core 20 and the stator coil 30 with a varnish, a fixing process is performed to manufacture the stator 1.

In the present embodiment, a case where TIG (Tungsten Inert Gas) welding is performed when the tip portions 34 of the workpiece having the torsionally formed coil end portion 35 are joined to each other will be described. The stator manufacturing apparatus according to the present embodiment includes a clamp jig 40 that protrudes from the upper end surface 24 of the stator core 20 and welds the tip portions 34 adjacent to each other in the radial direction.

The clamping jig extends in the radial direction of the stator core to clamp the tip portion, is separated in the radial direction and is formed to protrude in the circumferential direction, and a plurality of positioning protrusions that sandwich the tip portion between adjacent ones. And a guide portion extending from the lower end portion of the positioning protrusion portion and forming an inclined surface inclined with respect to the circumferential direction so as to taper from the base end side to the tip end side of the positioning protrusion portion.

FIG. 2 is a diagram showing a state in which the tip portion is welded by the stator manufacturing apparatus according to the first embodiment. In the following description, the rows of the tip portions 34 arranged in the radial direction may be collectively referred to as a tip portion row. Note that FIG. 2 shows only some of the tip rows 34a, 34b, and 34c of the plurality of coil end portions 35 existing in the work.

As shown in FIG. 2, the clamp jig 40 has a pair of the first jig 40a and the second jig 40b. The first jig 40a and the second jig 40b extend in the radial direction and are arranged so as to face each other in the circumferential direction. The clamp jig 40 can grip a plurality of tip portions 34 to be welded between the first jig 40a and the second jig 40b. Further, the clamp jig 40 is connected to the positive electrode side of the welding power source and functions as an electrode to form a welding device.

The welding apparatus uses a welding torch 60 connected to the negative electrode side of the welding power source to generate an arc 61 between the electrode of the welding torch 60 and the welded portion of the tip portion 34 clamped to the clamping jig 40. It is something to generate. In TIG welding using such a welding device, a welded ball is formed by melting the welded portion of the tip portion 34 using the arc 61 as a heat source while ejecting a shield gas. As a result, one of the melted tips 34 is joined to the other adjacent tip 34, which is also melted.

On the other hand, the tip portion 34 of the segment coil 31 has a flat upper end and a chamfer is formed on the outer periphery thereof. The side surface of the tip portion 34 is composed of a flat long side side surface and a flat short side side surface, and chamfers are formed at four corners. The tip portions 34 to be joined are welded with the long side surfaces of the tip portions 34 in contact with each other or in close proximity to each other.

Next, the detailed configuration of the clamp jig 40 will be described with reference to FIGS. 3 and 4. FIG. 3 is a front view showing a clamp jig included in the stator manufacturing apparatus according to the first embodiment. FIG. 4 is a perspective view showing a main part of FIG. 3 and 4 show views of the first jig 40a as viewed from the side facing the second jig 40b.

The first jig 40a and the second jig 40b have symmetrical shapes with respect to the radial direction. Therefore, FIGS. 3 and 4 show the first jig 40a to explain the configuration of the clamp jig 40, and the detailed description of the second jig 40b will be omitted. The clamp jig 40 is made of a conductive material such as copper or a copper alloy.

As shown in FIG. 3, the first jig 40a has a jig main body 41 and a contact portion 42. The jig body 41 extends in the radial direction of the stator 1 and supports the contact portion 42. The contact portion 42 has a plurality of positioning protrusions 43, a plurality of guide portions 44, and a contact surface 45. In the first jig 40a, at least the contact portion 42 can be arranged between the tip rows 34a and 34b adjacent to each other in the circumferential direction, and the other tip rows 34a adjacent to the tip row 34b to be welded. It is preferable that the shape does not interfere with 34c.

As shown in FIG. 4, the positioning protrusions 43 are formed so as to project in the circumferential direction, and a plurality of the positioning protrusions 43 are provided with respect to the jig main body 41. The positioning protrusion 43 is tapered toward the tip in the protrusion direction when viewed from above, and the surface facing the positioning protrusion 43 existing next to the positioning protrusion 43 is formed as a tapered surface 43a. The plurality of positioning protrusions 43 are provided on the side of the first jig 40a facing the second jig 40b at a distance in the radial direction, and between the positioning protrusions 43 adjacent to each other in the radial direction. A space for holding the tip 34 is formed.

Between the adjacent positioning protrusions 43, the tip portions 34 adjacent to each other in the radial direction and joined to each other are arranged in a pair state. Adjacent positioning protrusions 43 hold a pair of tip portions 34 in the radial direction by the tapered surfaces 43a facing each other. Further, a part of the outer circumference of the pair of the arranged tip portions 34 comes into contact with the contact surface 45 of the first jig 40a corresponding to the space for holding the tip portions 34. The contact surface 45 is composed of two tapered surfaces 43a of adjacent positioning projections 43 facing each other and a surface 41a formed between the adjacent positioning projections 43.

In the present embodiment, the first jig 40a is provided with five positioning protrusions 43, and four contact surfaces 45 are formed. That is, it is assumed that four spaces are provided between the five positioning protrusions 43. As for the eight tip portions 34 arranged in the radial direction, each pair is arranged in each of the four spaces formed between the adjacent positioning protrusions 43 in a state where the tip portions 34 to be joined are paired with each other.

The guide portion 44 extends downward in the axial direction from the lower end portion of the positioning protrusion portion 43. The guide portion 44 has a tapered shape that tapers from the proximal end side to the distal end side of the positioning protrusion 43 when viewed from the radial direction. The base end side of the guide portion 44 is connected to the jig body 41. The connecting portion between the guide portion 44 and the jig body 41 is away from the clamped tip portion 34 so as not to come into contact with the tip portion 34 when the tip portion 34 of the segment coil 31 is aligned by the clamp jig 40. It is preferable to extend to.

Further, the lower end surface of the guide portion 44 is formed as an inclined surface 44a inclined with respect to the circumferential direction. In other words, the guide portion 44 has an inclined surface 44a so that the cross-sectional area cut in the radial direction becomes smaller toward the tip. The inclined surface 44a and the tapered surface 43a of the positioning protrusion 43 serve to guide the tip portion 34 to an appropriate clamp position for welding the tip portions 34 to each other.

For example, in the first jig 40a shown in FIG. 2, the guiding portion 44 is provided for the three positioning protrusions 43 located on the center side of the five positioning protrusions 43. The remaining two positioning protrusions 43 located on the outermost side have a tapered surface 43a formed only on one side in the radial direction facing the positioning protrusions 43 existing adjacent to each other. Further, the lower ends of the two positioning protrusions 43 located on the outermost side are connected to the jig main body 41. It is preferable that this connecting portion is extended in a direction away from the clamped tip portion 34 so as not to come into contact with the tip portion 34 when the tip portion 34 of the segment coil 31 is aligned by the clamp jig 40.

The first jig 40a having such a shape and the second jig 40b having a shape symmetrical to the first jig 40a face each other in the circumferential direction, and the contact portions 42 thereof. A plurality of tip portions 34 can be clamped by bringing them close to each other so that the tip portion 34 can be brought into contact with the tip portion 34 to be welded. For example, as shown in FIG. 2, the first jig 40a is inserted between the tip rows 34a and 34b, and the second jig 40b is inserted between the tip rows 34b and 34c. The clamp jig 40 is configured to be movable in a predetermined three-dimensional space by a driving device or the like.

Subsequently, with reference to FIGS. 5 to 7, a flow for aligning the tip portion 34 with the clamp jig 40 will be described. FIG. 5 is a diagram showing a state in which the clamp jig included in the stator manufacturing apparatus according to the first embodiment is arranged above the tip portion. FIG. 6 is a diagram showing a state in which the clamp jig included in the stator manufacturing apparatus according to the first embodiment and the tip end portion are brought into close contact with each other. FIG. 7 is a diagram showing a state in which the tip portion is aligned by the clamp jig provided in the stator manufacturing apparatus according to the first embodiment.

First, as shown in FIG. 5, the clamp jig 40 is located above the tip row 34b to be welded, and the tip row 34b is located between the first jig 40a and the second jig 40b. Arrange like this. At this time, for example, the tip portion 34 located on the inner peripheral side of the pair of the tip portions 34 may be arranged directly below the guide portion 44 of the first jig 40a. Further, the first jig 40a and the second jig 40b are separated from each other.

Subsequently, the clamp jig 40 and the tip portion 34 come close to each other by lowering the clamp jig 40 toward the work along the axial direction. When the clamp jig 40 and the tip portion 34 come close to each other, the tip portion 34 and the first jig 40a come into contact with each other. As shown in FIG. 6, after the tip portion 34 directly below the guide portion 44 of the first jig 40a moves upward along the inclined surface 44a, the short side side surface of the tip portion 34 is the positioning protrusion portion 43. Contact the tip. Since the upper end of the tip portion 34 is chamfered on the outer periphery, the tip portion 34 can move smoothly while abutting on the inclined surface 44a.

The clamp jig 40 descends to a position where the welded portion of the tip portion 34 protrudes from the upper end surface of the positioning protrusion 43. Then, as shown in FIG. 7, as the clamp jig 40 moves in the inner peripheral direction, the tip portion 34 slides along the tapered surface 43a while abutting on the positioning protrusion portion 43. As a result, the tip portions 34 to be joined are arranged in a pair state between the adjacent positioning protrusions 43 in the first jig 40a.

At this time, a part of the outer circumference formed by the pair of the tip portions 34 is in contact with the contact surface 45 of the first jig 40a. Therefore, it is preferable that the shape of the contact surface 45 is formed so as to follow the shape of the outer circumference formed by the pair of the tip portions 34. As a result, an error in the alignment of the tip portion 34 can be reduced.

Subsequently, the second jig 40b moves along the circumferential direction so as to approach the first jig 40a, and the contact surface 45 of the second jig 40b comes into contact with the tip portion 34. As a result, the first jig 40a and the second jig 40b sandwich the tip row 34b. With such a flow, the clamping jig 40 can clamp a plurality of tip portions 34. Then, by passing an electric current through the welding torch 60 and the clamp jig 40, an arc 61 is discharged from the welding torch 60, the welded portion of the tip portion 34 is melted, and the corresponding tip portions 34 are joined to each other.

Next, the clamp jig 50 not provided with the guide portion 44 will be described with reference to FIG. FIG. 8 is a perspective view showing a main part of the clamp jig of the comparative example. The clamp jig 50 of the comparative example shown in FIG. 8 is the same as the clamp jig 40 except that the configuration of the contact portion 42 is different from that of the clamp jig 40. Therefore, FIG. 8 shows one of the first jigs 50a constituting the clamp jig 50, and the contact portion 52, which is a difference from the clamp jig 40, will be described. In the drawings, the same or corresponding configurations are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, the first jig 50a has a jig main body 41 and a contact portion 52. The configuration of the jig body 41 is the same as that of the clamp jig 40. The contact portion 52 has a plurality of positioning protrusions 53 and a contact surface 55.

The positioning protrusion 53 is tapered toward the tip in the protruding direction when viewed from above, and the surface facing the positioning protrusion 53 adjacent to the positioning protrusion 53 is formed as a tapered surface 53a. A space for holding the tip portion 34 is formed between the positioning protrusions 53 adjacent to each other in the radial direction.

Between the adjacent positioning protrusions 53, the tip portions 34 adjacent to each other in the radial direction and joined to each other are arranged in a pair state. Adjacent positioning protrusions 53 hold a pair of tip portions 34 in the radial direction by the tapered surfaces 53a facing each other. Further, a part of the outer circumference of the pair of the arranged tip portions 34 comes into contact with the contact surface 55 of the first jig 50a corresponding to the space for holding the tip portions 34. The contact surface 55 is composed of two tapered surfaces 53a of adjacent positioning projections 53 facing each other and a surface 51a formed between the adjacent positioning projections 53.

Further, the lower end portion of the positioning protrusion 53 is notched. The positioning protrusion 53 has a tapered shape that tapers from the proximal end side toward the distal end side when viewed from the radial direction. The lower end surface of the positioning protrusion 53 is formed as an inclined surface 53b inclined with respect to the circumferential direction. In other words, the positioning protrusion 53 has an inclined surface 53b so that the cross-sectional area cut in the radial direction becomes smaller toward the tip. In the case of the clamp jig 50 configured in this way, the tapered surface 53a and the inclined surface 53b of the positioning protrusion 53 have a function of inviting the tip portion 34 to an appropriate clamp position for welding the tip portions 34 to each other. Fulfill.

For example, in the first jig 50a shown in FIG. 8, the inclined surface 53b is formed with respect to the three positioning protrusions 53 located on the center side of the five positioning protrusions 53. The remaining two positioning protrusions 53 located on the outermost side have a tapered surface 53a formed only on one side in the radial direction facing the positioning protrusions 53 adjacent to each other. The configuration of the two outermost positioning protrusions 53 is the same as that of the two outermost positioning protrusions 43 corresponding to these in the first jig 40a.

Here, with reference to FIG. 9, the contact surface 45 of the clamp jig 40 included in the stator manufacturing apparatus according to the present embodiment and the contact surface 55 of the clamp jig 50 of the comparative example will be examined. FIG. 9 is a diagram comparing the state in which the tip portion is clamped to each of the clamp jig provided in the stator manufacturing apparatus according to the first embodiment and the clamp jig of the comparative example. The clamp jig 40 is shown on the left side of FIG. 9, and the clamp jig 50 is shown on the right side of FIG. Further, in FIG. 9, the contact surfaces 45 and 55 are shown by hatching.

As shown on the right side of FIG. 9, the clamp jig 50 of the comparative example is not provided with the guide portion 44, but instead attracts the tip portion 34 to be welded by forming the inclined surface 53b on the positioning protrusion portion 53. It has a function. Therefore, the area of the tapered surface 53a of the clamp jig 50 is smaller than that of the tapered surface 43a of the clamp jig 40 shown on the left side of FIG. Therefore, the area of the contact surface 55 in the clamp jig 50 of the comparative example is smaller than the area of the contact surface 45 in the clamp jig 40.

In the welding process of the tip portion 34 of the segment coil 31 at the time of forming the stator coil 30, the clamp jigs 40 and 50 are of a plurality of tip portions 34 or tip portion rows 34a, 34b, 34c closely arranged in the radial and circumferential directions. It needs to be inserted into the gap to clamp the tip 34 to be welded. Therefore, in the clamp jig 50 of the comparative example in which the area of the contact surface 55 in contact with the tip portion 34 is small, the contact surface 55 is more likely to be worn.

If welding is repeated on the worn contact surface 55, there is a possibility that the clamp jig 50 may be poorly energized or the clamp position may be displaced. If the clamp state is improper at the time of welding, there is a risk of causing welding defects such as welding sagging and melting at the welded tip portion 34. Therefore, in order to ensure good welding quality, it is preferable to increase the area of the contact surface 55 to improve the wear resistance of the contact surface.

The clamp jig 40 included in the stator manufacturing apparatus according to the present embodiment has a large contact surface 45 area as compared with the clamp jig 50 of the comparative example. Therefore, the wear resistance of the contact surface 45 is improved, and the life of the jig is extended. For example, in the example shown in FIG. 9, the area of the tapered surface 43a is expanded by about 20% as compared with the area of the tapered surface 53a of the clamp jig 50 of the comparative example. Therefore, when the tip portions 34 are welded to each other using the clamp jig 40, it is possible to reduce the occurrence of welding defects such as welding sagging and melting separation at the welded tip portions 34.

Further, the stator manufacturing apparatus according to the present embodiment includes a clamp jig having a positioning protrusion 43 and an induction portion 44. Therefore, when welding the tip portion 34 of the segment coil 31 at the time of forming the stator coil 30, the tip portion 34 to be joined can be clamped in an appropriate state. By forming the positioning protrusion 43 and the guide 44 in a tapered shape, the tip portion 34 to be welded can be more reliably guided to a desired position.

From the above, according to the stator manufacturing apparatus according to the present embodiment, it is possible to suppress the generation of unnecessary gaps between the members due to the misalignment between the tip portions to be joined or the misalignment between the clamp jig and the coil. Welding can be performed with each member in close contact. Further, by clamping the tip portion to be joined at an appropriate position, an arc can be stably generated between the welding torch and the portion to be welded, so that the welding quality of the joint portion can be improved. ..

Further, according to the stator manufacturing apparatus according to the present embodiment, it is possible to increase the area of the contact surface of the clamp jig that abuts on the tip portion to be joined. Since the area of the contact surface of the clamp jig is large, the wear resistance of the contact surface is improved and the life of the jig is extended. Further, by suppressing the wear of the contact surface, it is possible to suppress the energization failure and the displacement of the clamp position when the clamp jig is repeatedly used, so that the welding failure can be reduced.

As described above, by using the stator manufacturing apparatus according to the present embodiment, it is possible to reduce welding defects at the time of forming the stator coil and improve the quality of the stator.

1 Stator 20 Stator core 21 Rib 22 Bolt hole 23 Slot 24, 25 End face 26 Insulation paper 30 Stator coil 31 Segment coil 32, 32a Lead part 33 Connecting part 34 Tip part 34a, 34b, 34c Tip part row 35 Coil end part 40, 50 Clamp jigs 40a, 50a First jig 40b Second jig 41 Jig body 41a, 51a Surfaces 42, 52 Contact parts 43, 53 Positioning protrusions 43a, 53a Tapered surface 44 Induction parts 44a, 53b Inclined surface 45 , 55 Contact surface 60 Welding torch 61 Arc

Claims (1)

A stator manufacturing device including a clamp jig that projects from the end face of the stator core and welds adjacent tips in the radial direction among the segment coils inserted into the slots of the substantially annular stator core.
The clamp jig is
The tip portion is clamped by extending in the radial direction of the stator core.
A plurality of positioning protrusions that are radially separated and are formed so as to project in the circumferential direction and that sandwich the tip between adjacent ones.
A guide portion extending from the lower end portion of the positioning protrusion portion and forming an inclined surface inclined with respect to the circumferential direction so as to taper from the base end side to the tip end side of the positioning protrusion portion.
Stator manufacturing equipment with.

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