JP5954137B2 - Stator manufacturing method and stator manufacturing apparatus - Google Patents

Description

  The present invention relates to a technique for manufacturing a stator using a segment coil, and more specifically, after the segment coil is inserted into a slot of the stator, when the end portion of the segment coil is welded, the insulation coating portion of the segment coil is cooled. The present invention relates to a technique using a jig provided with a cooling means.

  In recent years, there have been an increasing number of cases in which a driving motor is mounted on an automobile. A drive motor mounted on a vehicle is required to be space-saving because the mounting space is limited. Further, in order to improve the driving performance of automobiles, it is required to increase the output of the motor. In particular, hybrid vehicles must be equipped with both an engine and a drive motor in the engine room, and space constraints are severe. For this reason, further miniaturization of the motor is required. Of course, it is desirable to reduce the size and increase the output of a motor used in a general machine.

  Patent Document 1 discloses a technique related to a winding joining method for a rotating electrical machine. Patent Document 2 also discloses a similar technique. When conductor layers of 8 layers and 4 rows are inserted into the stator core and welded, earth electrodes are installed so as to contact the conductor segments from the inner and outer peripheral sides of the stator. The ground electrode is placed in contact with the outermost and outermost peeled parts, and the second and third rows are indirectly welded by welding the first row and the fourth row. Be grounded as possible. By doing so, it is possible to simplify the welding process.

JP 2008-154433 A JP 2008-199751 A

  However, the stator manufacturing method using the technique disclosed in Patent Document 1 or Patent Document 2 is considered to have the following problems.

  When welding the coil ends of the stator, a welding technique such as TIG welding is used. However, no matter what welding method is used, the influence of heat generated in the weld during welding is unavoidable, and there is a possibility that the insulation coating of the conductor segment is damaged by the heat effect. In the techniques disclosed in Patent Document 1 and Patent Document 2, the arrangement of the ground electrode is facilitated, but no particular mention is made of the influence of heat on the insulation-coated portion by welding. In Patent Document 1, TIG welding is used for welding, and the temperature reaches the temperature at which the end of the segment end melts during welding. For this reason, heat is transmitted to the resin used for the insulation coating by transmitting the peeled portion at the segment end. A resin such as enamel is used for the insulating coating, but if the temperature exceeds the glass transition point of the resin, the insulating property of the insulating coating may be lost.

  In order to avoid such a thermal effect, for example, a method in which the end of the conductor segment is elongated in the axial direction of the stator can be considered. However, in the method of extending the end of the conductor segment, the coil end of the stator becomes large, and it may not be possible to meet the demand for miniaturization of the stator.

  Therefore, in order to solve such a problem, the present invention suppresses the thermal effect on the insulation coating portion generated during welding of the coil end portion without extending the axial length of the conductor segment, and damages the insulation coating of the segment. It is an object of the present invention to provide a stator manufacturing method and a manufacturing apparatus thereof that can be suppressed.

  In order to achieve the above object, a stator manufacturing method according to an aspect of the present invention has the following characteristics.

(1) In the stator manufacturing method, a coil segment is inserted into a stator core, and a segment end of the coil segment is welded to form a coil. In the stator manufacturing method, the segment end of the coil segment inserted into the stator core The peeling part from which the insulation coating is peeled is gripped by a clamp jig extending in the radial direction of the stator core, and when the segment end parts are welded to each other, Separating a welding region on the side where the end portion is disposed and a cooling region on the side where the stator core is disposed, by the cooling means disposed on the cooling region side, the segment end portion on the cooling region side Te by blowing a gas, cooling the segment ends, as the cooling means, air passage for passing the gas to the clamping jig, the segment end Characterized in that, provided in the opening towards.

  According to the aspect described in (1) above, when welding the segment end that is the end of the coil segment inserted into the stator core, the clamp jig is grounded by holding it with the clamp jig. It plays the role of an electrode and the segment ends are welded together. At the time of welding, a cooling gas is blown to the end of the segment by the cooling means for forced cooling. At this time, the clamp jig extending in the radial direction by the clamp jig separates the welding region and the cooling region. By carrying out like this, the heat transmitted from the segment front-end | tip to the insulation coating part at the time of welding cools a segment edge part by the cooling area | region side, On the other hand, the influence on the welding area | region side can be suppressed as much as possible. As a result, it is possible to prevent the insulation property of the insulating coating portion at the end of the segment from being lowered after welding.

(2) In the stator manufacturing method, a coil segment is inserted into a stator core, and a segment end of the coil segment is welded to form a coil. In the stator manufacturing method, the segment end of the coil segment inserted into the stator core The peeling part from which the insulation coating is peeled is gripped by a clamp jig extending in the radial direction of the stator core, and when the segment end parts are welded to each other, Separating a welding region on the side where the end portion is disposed and a cooling region on the side where the stator core is disposed, by the cooling means disposed on the cooling region side, the segment end portion on the cooling region side Te by blowing a gas, cooling the segment ends, as the cooling means, air passage for passing the gas to the clamping jig, the segment end The opening of the ventilation path is inclined to the end face side of the stator core so that the gas flows from the ventilation path toward the end face of the stator core. It is characterized by that.

  By the aspect as described in said (2), the opening part of the ventilation path which is a cooling means with which the clamp jig was equipped is formed inclining to the end surface side of a stator core, From the opening part of a ventilation path Cooling gas is ejected toward the end face side of the stator core. For this reason, when the segment end is cooled during welding, the influence of the cooling gas on the welded portion of the segment end can be suppressed as much as possible.

  In many cases, the segment end of the stator is welded using TIG welding as shown in Patent Document 1, but TIG welding requires welding while blowing a gas called shield gas to the welded portion. . However, if the cooling gas released from the cooling means blows off the shielding gas, there is a risk of poor welding. This effect can be suppressed to some extent by separating the welded area and the cooling area with a clamp jig, but the effect can be further suppressed by directing the opening of the ventilation path toward the end face of the stator core. Become.

  In order to achieve the above object, a stator manufacturing apparatus according to an aspect of the present invention has the following characteristics.

(3) In a stator manufacturing apparatus that manufactures a stator by welding the segment end of a coil segment inserted into the stator core, a stripped portion from which the insulation coating is stripped of the segment end of the coil segment A clamping jig extending in the radial direction of the stator core, and a cooling means for blowing a cooling gas to the end of the segment, and the clamping jig clamps the peeling portion By separating the end surface side of the stator core and the end portion side of the peeling portion into a cooling region and a welding region, the cooling means is disposed on the cooling region side and passes the gas to pass the gas. a ventilation passage provided in the clamping jig, characterized Rukoto, such than its opening.

  According to the aspect described in (3) above, in the same manner as in the fixing manufacturing method of (1) above, when welding the segment end that is the end of the coil segment inserted into the stator core, the segment end is cooled by the cooling means. Cooling is performed by blowing a cooling gas to the part. At this time, the segment end is gripped using the clamp jig, the clamp jig serves as a ground electrode, and the welding region and the cooling region are separated by the clamp jig. Therefore, the segment end can be cooled in the cooling region, and it is possible to suppress a decrease in insulation of the insulating coating portion at the segment end. Further, the influence of the cooling gas blown for cooling in the cooling region reaches the welding region, and the influence on the welding can be minimized.

(4) In a stator manufacturing apparatus that manufactures a stator by welding the segment end of a coil segment inserted into the stator core, a stripped portion from which the insulation coating is stripped of the segment end of the coil segment A clamping jig extending in the radial direction of the stator core, and a cooling means for blowing a cooling gas to the end of the segment, and the clamping jig clamps the peeling portion By separating the end surface side of the stator core and the end portion side of the peeling portion into a cooling region and a welding region, the cooling unit is disposed on the cooling region side, and the cooling unit is An air passage provided in the clamping jig for allowing the gas to pass therethrough and an opening thereof, and the opening of the air passage opens toward the end of the segment, and the stator extends from the air passage. Co Of As the gas flows toward the end surface, that is formed inclined on the end face side of the stator core, characterized by.

  According to the aspect described in the above (4), the opening portion of the ventilation path which is a cooling means provided in the clamp jig is inclined toward the end face side of the stator core, similarly to the fixed manufacturing method of the above (2). By being formed, cooling gas is ejected from the opening part of a ventilation path toward the end surface side of a stator core. For this reason, even when the segment end is cooled during welding, the influence of the cooling gas on the welded portion of the segment end can be suppressed as much as possible.

It is a perspective view of a stator of a 1st embodiment. It is an expansion perspective view by the side of a coil end partial lead of a stator of a 1st embodiment. It is a perspective view which shows the state which inserted the segment in the stator core of 1st Embodiment, and was expanded afterward. It is a top view of a segment of a 1st embodiment. It is an outline of the assembly process of a stator of a 1st embodiment. (A) It is a perspective view of a stator core. (B) It is a perspective view of the state which equipped the stator core with the insulator. (C) It is a perspective view of a segment. (D) It is sectional drawing which shows a mode that the segment was inserted in the stator core. (E) It is sectional drawing which shows a mode that the segment was welded. It is a flowchart of the assembly process of a stator of 1st Embodiment. It is a side view which shows the front-end | tip part of the lead part of the state after the twist forming process of 1st Embodiment. It is a side view of the lead part after welding of a 1st embodiment. It is the side view which showed a mode that the lead part was clamped with the clamp jig | tool of 1st Embodiment. It is the perspective view which showed a mode that a lead part was clamped with the clamp jig | tool of 1st Embodiment. It is sectional drawing which shows a mode that the lead part clamped with the clamp jig | tool of 1st Embodiment is welded. It is the side view of the lead part prepared for the comparison. (A) It is a side view of lead part Sga at the time of not performing cooling. (B) It is a side view of lead part Sga which extended axial length. It is sectional drawing which shows the mode of the lead part clamped with the clamp jig | tool of 2nd Embodiment.

  First, a first embodiment of the present invention will be described with reference to the drawings. In addition, the detailed part of drawing used for description is simplified on account of description.

  FIG. 1 is a perspective view of the stator 10 according to the first embodiment. FIG. 2 shows an enlarged perspective view of the stator 10 on the coil end partial lead side. The stator 10 includes a stator core 20 and a segment coil SC. A stator core 20 formed by laminating electromagnetic steel plates having a substantially cylindrical shape is provided with a slot 12 between adjacent teeth 11 formed so as to protrude to the inner peripheral side. The number of prepared teeth 11 is 48, and the number of slots 12 is the same. Three ribs 21 and bolt holes 22 are provided on the outer peripheral side of the stator core 20. And a motor cover etc. can be attached etc. using the volt | bolt hole 22. FIG. An insulator 25 having insulation properties shown in FIG. 2 is inserted into the slot 12. The insulator 25 ensures insulation between the segment coil SC and the stator core 20.

  FIG. 3 shows a perspective view of the stator core 20 in which the segment Sg is inserted and then expanded. FIG. 4 shows a plan view of the segment Sg. The segment Sg is formed by edgewise bending a rectangular conductor D with an insulation coating into a substantially U shape. The segment Sg is roughly divided into three parts. The in-slot conductor portion Sgb inserted into the slot 12 of the stator core 20, the lead portion Sga protruding from the end face of the stator core 20 toward the lead side of the stator 10, and the anti-lead portion Sgc. For convenience, the lead portion Sga is referred to as a lead portion SgaA and a lead portion SgaB separately. Further, the in-slot conductor portion Sgb is referred to as an in-slot conductor portion SgbA and an in-slot conductor portion SgbB. The anti-lead portion Sgc is composed of a crank portion Sge, a hypotenuse portion SgdA, and a hypotenuse portion SgdB. The tips of the lead portion SgaA and the lead portion SgaB are peeled to be provided with a peeling portion Sgi which will be described later.

  In FIG. 5, the outline of the assembly process of the stator 10 is shown. FIG. 5A shows a perspective view of the stator core 20. FIG. 5B shows a perspective view in which the stator core 20 is provided with an insulator 25. FIG. 5C shows a perspective view of the segment Sg. FIG. 5D is a cross-sectional view showing a state where the segment Sg is inserted into the stator core 20. FIG. 5E shows a cross-sectional view of the segment Sg welded. Note that the perspective view shown in FIG. 5 is simplified in shape for explanation. First, the segment Sg shown in FIG. 5 (c) is inserted into the slot 12 formed in the stator core 20 shown in FIG. 5 (a) with the insulator 25 inserted as shown in FIG. 5 (b). To do.

  As a result, the state shown in FIG. That is, the segment Sg partially protrudes from the end of the stator core 20, and the lead portion SgaA and the lead portion SgaB protrude. Then, the lead portion SgaA and the lead portion SgaB are twisted. As a result of the lead portion Sga being twisted, the lead portions Sga arranged with the three slots 12 therebetween become adjacent to each other, and the peeled portions Sgi are welded to each other as shown in FIG. By forming, the stator 10 is formed. In addition, although the formation process of the stator 10 is notionally demonstrated in FIG. 5, in the actual assembly | attachment process, the alignment process which arrange | positions the segment Sg in a ring shape is required. In addition, the lead portion SgaA and the lead portion SgaB that inevitably separate the three slots 12 are not welded, and the combination of the innermost and outermost lead portions Sga of the stator core 20 changes due to the convenience of wiring. To do.

  FIG. 6 shows a flowchart of the assembly process of the stator 10. In S <b> 1, “straight conductor straightening and cutting” is performed. Since the rectangular conductor D with the insulation coating is wound around a bobbin (not shown), the flat conductor D is unwound and trimmed to a required length. In S2, “segment formation” is performed. The flat conductor D is edgewise bent, and a crank portion Sge is created using a die (not shown) to obtain a substantially U-shaped segment Sg. In S3, “segment alignment” is performed. The segment Sg is arranged in a cylindrical shape by combining the crank portions Sge of the segment Sg so that eight in-slot conductors SgbA or eight in-slot conductors SgbB can be accommodated in the slot 12 of the stator core 20 to form a segment coil SC. To do.

  In S4, “insulator insertion” is performed. Each slot 12 is provided with an insulator 25 in the slot 12 of the stator core 20 in order to insulate the stator core 20 from the segment coil SC. In this step, the insulator 25 is inserted into the slot 12. In S5, “segment coil insertion” is performed. Strictly speaking, this is a step of bringing the segment coil SC close to the stator core 20 and inserting the lead portion Sga into the slot 12 provided with the insulator 25. In S6, “wedge insertion” is performed. A wedge paper 13 (not shown) is inserted into the innermost circumferential side of the stator core 20 in a state where eight in-slot conductor portions Sgb of the segment Sg are inserted into the slot 12. In S7, “extended after lead portion” is performed. This is a step of expanding the pitch of the lead portions Sga, and has the purpose of improving weldability.

  In S8, “twist formation” is performed. The lead portion Sga of the segment coil SC inserted into the stator core 20 is twisted in the radial direction of the stator core 20 and deformed into a shape in which adjacent coils are connected. As shown in FIG. 2, the lead portions Sga are twisted in different directions in the lead portions Sga adjacent in the radial direction. In S9, “Tig welding” is performed. As shown in FIG. 5E, welding balls Sgf are formed by welding adjacent lead portions Sga to each other. Details will be described later.

  In S10, “coil end portion insulation processing” is performed. This is a step of applying an insulation coating to the weld ball Sgf, and the resin coating is used for the insulation coating by powder coating. Further, by impregnating the segment coil SC with varnish, the segment coil SC is fixed so that the segment coil SC does not move with respect to the stator 10 due to vibration transmitted from the vehicle body or the like when the stator 10 is operated.

  Next, the above-described S9 Tig welding process will be described in a little more detail. FIG. 7 is a side view showing the leading end portion of the lead portion Sga in a state where the twist forming process of S8 is finished. FIG. 8 is a side view showing the lead portion Sga after welding. When the “twist forming” step of S8 is completed, the respective heights of the lead portions Sga are substantially equal as shown in FIG. The first lead portion Sga1 to the eighth lead portion Sga8 are provided between the second lead portion Sga2 and the third lead portion Sga3, between the fourth lead portion Sga4 and the fifth lead portion Sga5, and the sixth lead portion Sga6. And the seventh lead portion Sga7. This is because the gap provided in the “extended after lead portion” step of S7 is secured as it is through S8. As a result of performing Tig welding, a weld ball Sgf is formed at the tip as shown in FIG.

  FIG. 9 is a side view showing a state where the lead portion Sga is clamped by the clamp jig 100. FIG. 10 is a perspective view showing how the lead portion Sga is clamped by the clamp jig 100. FIG. 11 is a cross-sectional view showing a state where the lead portion Sga clamped by the clamp jig 100 is welded. As shown in FIG. 10, the clamp jig 100 includes a pair of left and right first chuck jigs 110 and second chuck jigs 120 that extend in the radial direction of the stator core 20. The peeling part Sgi is made into two pairs, and is gripped by the first chuck jig 110 and the second chuck jig 120, so that the peeling part Sgi can be welded.

  The first chuck jig 110 is provided with a recess 111 for clamping the peeling portion Sgi. Guides 112 are provided on the left and right sides of the dent 111 to guide the peeling portion Sgi so that it can be chucked at a predetermined position, and an opening 113 connected to the ventilation path 114 is provided on the bottom surface of the dent 111. ing.

  The ventilation path 114 is provided through the side surface of the clamp jig 100 as shown in FIG. As shown in FIG. 10, the first chuck jig 110 and the second chuck jig 120 are formed in a substantially L shape, and the first chuck jig 110 and the second chuck jig 120 are separated from each other. When Sgi is sandwiched, a cooling region A1 is formed between the clamp jig 100 and the lead portion Sga. An air hose (not shown) is connected to the ventilation path 114, and air whose pressure is adjusted is supplied. As a result, cooling air is supplied to the cooling region A1 from the opening 113 opened from the ventilation path 114. Factory air is used as the cooling air, but cooled air may be used as necessary. In addition, the peeling part Sgi end part side in the state where the lead part Sga is gripped by the clamp jig 100 is referred to as a welding region A2 for convenience.

  Similarly to the first chuck jig 110, the second chuck jig 120 is provided with a recess 121 and a guide 122, and an opening 123 and a ventilation path 124 are also provided. The first chuck jig 110 and the second chuck jig 120 are provided with a moving mechanism (not shown) so as to be close to and away from each other. The peeling portion Sgi is clamped by the first chuck jig 110 and the second chuck jig 120 as described above, and the peeling portion Sgi is welded using the welding electrode 130.

  When welding the peeled portion Sgi of the lead portion Sga, the clamp jig 100 becomes an electrode by gripping the peeled portion Sgi with the clamp jig 100, and TIG welding becomes possible. At this time, the cooling region A1 and the welding region A2 are separated by the first chuck jig 110 and the second chuck jig 120. And since compressed air is supplied from the opening part 113 and the opening part 123 which are opened on the cooling area A1 side, the lead part Sga and the peeling part Sgi arranged on the cooling area A1 side are cooled by air.

  A tungsten electrode 133 is disposed in the center of the shield gas nozzle 134, and a shield gas 132 using argon, helium, or the like is injected from the shield gas nozzle 134. An arc 131 is formed between the tungsten electrode 133 and the peeling portion Sgi, and the adjacent peeling portions Sgi are welded together to form a weld ball Sgf. As a result, in the lead portion Sga, the welding balls Sgf as shown in FIG. 8 are arranged radially at the end of the stator 10.

  Since the stator 10 of 1st Embodiment is manufactured by the structure demonstrated above, there exists an effect | action and effect which are demonstrated below by said manufacturing method.

  First, it is possible to suppress the extension of the coil end of the stator 10 as an effect. This is because the segment Sg is inserted into the stator core 20 in the stator manufacturing method in which the segment Sg is inserted into the stator core 20 and the end of the lead portion Sga of the segment Sg is welded to form the segment coil SC. The peeled portion Sgi of the lead portion Sga is gripped by the clamp jig 100 extending in the radial direction of the stator core 20 and the peeled portions Sgi are welded by the clamp jig 100 when the peeled portions Sgi are welded together. With the ventilation path 114 (ventilation path 124) serving as a cooling means provided in the clamp jig 100, the welding area on the side where the end of the coil is disposed and the cooling area A1 on the side where the stator core 20 is disposed are separated. The lead portion Sga is cooled by blowing gas to the lead portion Sga on the cooling region side.

  When the peeled portion Sgi formed at the tip of the lead portion Sga is TIG welded to form the weld ball Sgf, the welding heat h shown in FIG. 11 is transmitted from the peeled portion Sgi during welding. FIG. 12 is a comparative view relating to the tip portion of the lead portion Sga prepared for explanation. (A) shows a side view of the lead portion Sga when cooling is not performed, and (b) shows a side view of the lead portion Sga with the axial length extended. For convenience, a portion where the insulating coating of the lead portion Sga is not peeled is defined as an unpeeled portion Sgj. In this case, the peeled portion Sgi is peeled together with the insulating coating formed around it at a predetermined peel length x1, and the uncovered portion Sgj is provided with an insulating coating for ensuring insulation from the adjacent lead portion Sga. It has been subjected.

  As a result of welding the peeled portion Sgi formed at the tip of the lead portion Sga shown in FIG. 12A, it has been confirmed by the applicant's experiment that the unpeeled portion Sgj is 400 ° C. or higher. The insulating coating portion provided in the unpeeled portion Sgj is made of enamel or the like. When the temperature is 400 ° C. or higher, the insulating property of the insulating coating is impaired. Therefore, as shown in FIG. 12A, a heat-affected zone Dp in which the insulating coating suffers thermal damage due to the influence of the welding heat h is formed. In the heat affected zone Dp, the insulating property is remarkably lowered as compared with the normal portion, and there is a problem that the insulation with the adjacent lead portion Sga cannot be ensured and a short circuit occurs.

  As a countermeasure against this, as shown in FIG. 12B, a method of extending the peeled portion Sgi by a heat-affected length x3 having the heat-affected portion Dp in FIG. As a result, the heat affected zone Dp is not formed in FIG. However, the peeling length x2 is a result of extending the lead portion Sga by the heat-affected length x3, so that naturally the extension of the coil end of the stator 10 is caused.

  However, in the method for manufacturing the stator 10 according to the first embodiment, the clamp jig 100 is provided with the opening 113 (opening 123) and the ventilation path 114 (ventilation path 124) as cooling means. The lead portion Sga is forcibly cooled by blowing cooling air from the ventilation path 114 (ventilation path 124). Although factory air is used, a sufficient cooling effect can be obtained by blowing air to the lead portion Sga with a predetermined pressure. The applicant has cooled the lead portion Sga by this method, and has confirmed that the temperature of the insulating coating portion of the unpeeled portion Sgj is lowered to about 300 ° C. The glass transition temperature of the insulating coating used for the non-peeled portion Sgj of the first embodiment is about 350 ° C., and the temperature of the non-peeled portion Sgj is lowered below the temperature at which the insulating coating is damaged by cooling by the cooling means. Means that. That is, heat transmitted from the tip of the peeling portion Sgi to the unpeeled portion Sgj is suppressed, and it is possible to suppress the generation of the heat affected zone Dp in the insulating coating of the non-peeled portion Sgj.

  Further, the clamp jig 100 forms a cooling region A <b> 1 between the peeling portion Sgi and the clamp jig 100 depending on the shapes of the first chuck jig 110 and the second chuck jig 120. The shape of the first chuck jig 110 and the second chuck jig 120 includes a guide 112 (guide 122) so that the peeling portion Sgi can be called as shown in FIG. Therefore, although the cooling region A1 and the welding region A2 cannot be completely separated, the air supplied from the opening 113 or the opening 123 can be cut off to some extent. For this reason, even if air is supplied during welding of the peeled portion Sgi by the welding electrode 130, the influence on the shield gas 132 can be suppressed. It should be noted that the air supply method does not preclude taking a technique such as jetting while avoiding welding or lowering the air pressure during welding.

  Further, a ventilation path 114 and a ventilation path 124 are provided in the first chuck jig 110 and the second chuck jig 120 of the clamp jig 100, respectively, and cooling air is circulated, so that the clamp jig 100 itself It is also effective for cooling. Cooling the first chuck jig 110 and the second chuck jig 120 leads to protection of the clamp jig 100 and promotes heat transfer from the portion that chucks the lead portion Sga. Therefore, it is effective for cooling the lead portion Sga.

  Next, a second embodiment of the present invention will be described. Although the configurations of the first embodiment and the second embodiment are substantially the same, the configurations of the opening 113, the ventilation path 114, the opening 123, and the opening 123 are slightly different, and will be described below.

  FIG. 13 is a cross-sectional view showing the state of the lead portion clamped by the clamping jig of the second embodiment. The first chuck jig 110 and the second chuck jig 120 of the clamp jig 100 are provided with a ventilation path as a cooling means as in the first embodiment. However, the ventilation path 114 provided in the 1st chuck | zipper jig | tool 110 is formed diagonally, and it is comprised so that the air injected from the opening part 113 may go to the end surface side of the stator core 20 which is not shown in figure. Similarly, the second chuck jig 120 also has an air passage 124 formed obliquely so that the opening 123 faces the lower side of the drawing, that is, the end face side of the stator core 20. By appropriately setting the angles of the ventilation path 114 and the ventilation path 124, it is possible to obtain a state that does not adversely affect the welding quality while obtaining a cooling effect.

  As described above, according to the method for manufacturing the stator 10 of the second embodiment, it is possible to make it less likely to affect the formation of the weld ball Sgf in the welding process than in the case of the first embodiment. This is because, due to the structure of the clamp jig 100, it is difficult to completely separate the cooling region A1 and the welding region A2 as described above. Therefore, if the opening 113 and the ventilation path 114, the opening 123 and the ventilation path 124 are devised and the flow of air is controlled, the amount of air flowing out to the welding region A2 side can be reduced. As a result, it is possible to improve the welding quality.

  Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented. For example, although the number of in-slot conductors Sgb inserted into the slots 12 of the stator core 20 has been described as eight, it is not hindered from increasing or decreasing the number. Moreover, the flow of the assembly process shown in FIG. 6 is not prevented from being changed as appropriate. Further, regarding the shape of the clamp jig 100, not only the first lead portion Sga1 to the eighth lead portion Sga8 are clamped at a time but also a method of clamping a larger number of lead portions Sga and welding them at a time. I do not disturb.

  Moreover, it does not prevent changing the timing which supplies air from the ventilation path 114 and the ventilation path 124, and the fluid used for cooling to things other than air. For example, a fluid having the same component as the shielding gas may be used, or other inert gas may be used. Further, in the first embodiment and the second embodiment, the passage is formed by making a hole in the clamp jig 100, but it does not prevent the passage from being separately formed by piping. For example, a metal thin tube or a tube connected to a nozzle may be used.

10 Stator 11 Teeth 12 Slot 20 Stator Core 100 Clamp Jig 110 First Chuck Jig 111, 121 Recess 112, 122 Guide 113, 123 Opening 114, 124 Ventilation Path 120 Second Chuck Jig 130 Welding Electrode 132 Shield Gas 133 Tungsten electrode 134 Shield gas nozzle A1 Cooling region A2 Welding region Sg Segment Sga Lead portion Sgb In-slot lead wire portion Sgf Welding ball Sgi Peeling portion Sgj Unpeeling portion

Claims (4)

In the stator manufacturing method, a coil segment is inserted into a stator core, and a coil is formed by welding a segment end of the coil segment.
Grasping the peeled portion from which the insulation coating has been peeled of the segment end portions of the coil segments inserted into the stator core by a clamp jig extending in the radial direction of the stator core,
When the segment ends are welded together, the clamping jig separates the cooling region on the side where the end of the peeling portion is disposed from the cooling region on the side where the stator core is disposed, Cooling the segment end by blowing gas against the segment end on the cooling region side by cooling means disposed on the region side;
As the cooling means, a ventilation path for passing the gas through the clamp jig is provided to open toward the segment end,
The stator manufacturing method characterized by these. In the stator manufacturing method, a coil segment is inserted into a stator core, and a coil is formed by welding a segment end of the coil segment.
Grasping the peeled portion from which the insulation coating has been peeled of the segment end portions of the coil segments inserted into the stator core by a clamp jig extending in the radial direction of the stator core,
When the segment ends are welded together, the clamping jig separates the cooling region on the side where the end of the peeling portion is disposed from the cooling region on the side where the stator core is disposed, Cooling the segment end by blowing gas to the segment end on the cooling region side by cooling means disposed on the region side;
As the cooling means, a ventilation path for passing the gas through the clamp jig is provided to open toward the segment end,
The opening of the ventilation path is formed to be inclined toward the end face side of the stator core so that the gas flows from the ventilation path toward the end face of the stator core.
The stator manufacturing method characterized by these. In the stator manufacturing apparatus for manufacturing the stator by welding the segment ends of the coil segments inserted in the stator core,
A clamp jig that grips the peeled portion from which the insulation coating is peeled among the segment ends of the coil segment, and extends in the radial direction of the stator core,
Cooling means for blowing a cooling gas to the segment end, and
The clamp jig clamps the peeling portion, thereby separating the end face side of the stator core and the end portion side of the peeling portion into a cooling region and a welding region,
It said cooling means, wherein disposed in the cooling region side, a ventilation passage provided in the clamp jig to pass the gas, such than the opening Rukoto,
The stator manufacturing apparatus characterized by this. In the stator manufacturing apparatus for manufacturing the stator by welding the segment ends of the coil segments inserted in the stator core,
A clamp jig that grips the peeled portion from which the insulation coating is peeled among the segment ends of the coil segment, and extends in the radial direction of the stator core,
Cooling means for blowing a cooling gas to the segment end, and
The clamp jig clamps the peeling portion, thereby separating the end face side of the stator core and the end portion side of the peeling portion into a cooling region and a welding region,
The cooling means is disposed on the cooling region side;
The cooling means includes a ventilation path provided in the clamping jig for allowing the gas to pass therethrough and an opening thereof, and the opening of the ventilation path opens toward the segment end, and the ventilation path More inclined to the end face side of the stator core so that the gas flows toward the end face of the stator core,
The stator manufacturing apparatus characterized by this.

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