JP2015231277A - Stator of rotary electric machine, and method and apparatus for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine, which is suitable for shortening of an axial dimension, and a method and an apparatus for manufacturing the stator.SOLUTION: A stator 10 of a rotary electric machine includes a stator core 11 that comprises a plurality of slots 13, and a polyphase coil 14 that is attached into the slot 13 while forming coil ends 14A on both end sides of the stator core 11, respectively. In the coil 14, legs 4B of a plurality of U-shaped segment conductors 5 are inserted from into the slots 13 from both the axial end sides of the stator core 11 and butt against one another, respectively, and butting tips of the legs 4B are joined together.

Description

  TECHNICAL FIELD The present invention relates to a stator for a rotating electrical machine such as a generator or an electric motor, a manufacturing method and a manufacturing apparatus thereof, and more particularly, a stator for a rotating electrical machine suitable for forming a coil by a U-shaped coil segment made of a rectangular wire. And a manufacturing apparatus.

  Conventionally, a stator of a rotating electrical machine in which a coil is formed by a U-shaped coil segment made of a flat wire has been proposed (see Patent Document 1). This is because the coil portions of the first layer to the fourth layer are formed in the slots of the stator core from the inner diameter side toward the outer diameter side by combining two types of U-shaped coil segments of the outer circumference conductor and the inner circumference conductor. Is forming. In other words, the outer conductor forms a first layer in the slot and a fourth layer in the slot adjacent to the U-shaped leg, and has a joint end that is bent so as to protrude from the slot and open to each other. . Further, the inner conductor forms a second layer in the slot and a third layer in the adjacent slot by the U-shaped leg portion, and has a joint end portion that protrudes from the slot and is bent so as to approach each other. Prepare. And the front-end | tip of each junction end part of an inner periphery conductor is each joined to the front-end | tip of the junction end part of each outer periphery conductor arrange | positioned adjacent to both sides, respectively.

JP 2006-67674 A

  However, in the above conventional example, the joining end portions of the inner conductor and the outer conductor are joined to each other at the coil end. For this reason, in order to join the joining ends, a space for arranging the conductor ends and making the tips adjacent to each other is required, and the axial dimension of the coil end becomes long, and the stator and the rotating electrical machine itself This is an impediment to downsizing the axial dimension.

  Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a stator for a rotating electrical machine, a manufacturing method thereof, and a manufacturing apparatus suitable for shortening the axial dimension.

  The present invention is a stator for a rotating electrical machine having a stator core having a plurality of slots, and a multi-phase coil mounted in the slots while forming coil ends on both ends of the stator core. The coil is formed by joining the leg ends of the plurality of U-shaped segment conductors that are inserted into the slots from both ends of the stator core in the axial direction and joined together.

  Therefore, in the present invention, since the coil end is constituted by the head portion of the U-shaped segment conductor, an axial space for wiring and connection becomes unnecessary, and the required axial space can be shortened. In addition, since the segment conductors are joined by abutting the tip ends of the U-shaped legs, the axial space for joining can be shortened. As a result, the axial dimensions of the stator and the rotating electrical machine can be reduced.

It is sectional drawing of the stator of the rotary electric machine which shows one Embodiment of this invention. It is AA sectional drawing of the stator of the rotary electric machine shown in FIG. It is explanatory drawing which shows partially the axial direction edge part of one stator core which attached the segment conductor. It is explanatory drawing which partially shows the edge part which faces the space between stator cores of the other stator core which attached the segment conductor. It is process drawing which shows the manufacturing process of the stator of this embodiment. It is explanatory drawing which shows the positioning state of the stator core by a positioning jig. It is sectional drawing which shows the positioning state of the stator core by a positioning jig. It is sectional drawing explaining the welding state by a joining jig. It is a side view explaining the welding state by a joining jig. It is explanatory drawing which shows an insulation process. It is a side view which shows the completed stator.

  Hereinafter, a stator of a rotating electrical machine of the present invention, a manufacturing method thereof, and a manufacturing apparatus will be described based on embodiments.

(First embodiment)
First, the stator of the rotating electrical machine of the present embodiment will be described with reference to FIGS. 1 and 2. 1 is a cross-sectional view of the stator, and FIG. 2 is a cross-sectional view of the stator shown in FIG.

  As shown in FIGS. 1 and 2, the stator 10 has a stator core 11 formed by laminating steel plates having a plurality (48 places) of teeth 12 on the inner periphery, and a plurality of members mounted in slots 13 between the teeth 12. Coil 14.

  The stator 10 includes a pair of stator cores 11 </ b> A and 11 </ b> B arranged as a stator core 11 with an interval in the axial direction. The pair of stator cores 11A and 11B are integrally formed by inserting a coil 14 and then inserting a spacer core 11C between the stator cores 11A and 11B and fixing the spacer core 11C by welding or the like.

  In addition, the stator 10 uses a segment conductor 5 having a U shape as a coil 14 by a head 4A and a pair of legs 4B extending in parallel from both ends of the head 4A. The segment conductor 5 has its leg portion 4B inserted into the respective slots 13 from the outside in the axial direction of the pair of stator cores 11A and 11B, and the end of the leg portion 4B passes through the slot 13 and protrudes into the space between the stator cores 11A and 11B. The tips of the protruding leg portions 4B are abutted and joined to form a coil 14. The leg portion 4B of the segment conductor 5 inserted into the slot 13 is wrapped with an insulating material (insulating paper) (not shown) to prevent contact with the wall surface of the slot 13 and contact with the adjacent leg portion 4B.

  The head 4A of the segment conductor 5 constitutes a coil end 14A that winds the axial end of the teeth 12 at both axial ends of the stator cores 11A and 11B. The coil part 14B to be housed is configured. The coil 14 is connected to the end of the wire 14 (not shown) by a bus bar so that three phases of U, V, and W are formed, and each end of the U, V, and W phases of the bus bar has three ends. It is connected to the terminal 14C (U, V, W).

  FIG. 3 is an explanatory view partially showing an axial end portion of one stator core 11A to which the segment conductor 5 is attached. FIG. 4 is an explanatory view partially showing an end portion of the other stator core 11B facing the one stator core 11A to which the segment conductor 5 is similarly attached.

  In the slots 13 of both the stator cores 11A and 11B, a plurality of, for example, four leg portions 4B of the segment conductor 5 wrapped in the insulating material 6 are provided from the inner diameter side to the outer diameter side of the stator cores 11A and 11B. It is inserted so as to constitute the first to fourth layers.

  As shown in FIG. 3, in one stator core 11A, two types of segment conductors 5A and 5B are mounted. That is, the segment conductor 5A connects the leg portions 4B inserted into the first layer in the slot 13 and the second layer in the slot 13 adjacent to the left side by the head portion 4A. Further, the segment conductor 5B connects the leg portion 4B inserted into the fourth layer in the slot 13 adjacent to the left side as well as the third layer in the slot 13 by the head portion 4A.

  As shown in FIG. 4, two types of segment conductors 5C and 5D are attached to the other stator core 11B. The segment conductor 5C connects the leg portion 4B inserted into the third layer in the slot 13 and the second layer in the slot 13 adjacent to the left side by the head portion 4A. Further, the segment conductor 5D connects the leg portion 4B inserted into the fourth layer in the slot 13 and the first layer in the slot 13 adjacent to the left side by the head portion 4A.

  Then, both the stator cores 11A and 11B are arranged with an interval in the axial direction with the segment conductors 5 mounted, and the leg portions of the segment conductors 5 arranged in the first to fourth layers in the slot 13 respectively. The tips of 4B are butted against each other, and the butted portions are joined by welding or the like.

  That is, the coil 14 joins the tips of the leg portions 4B, which are joined by inserting the leg portions 4B of the plurality of U-shaped segment conductors 5 into the slots 13 respectively from both axial ends of the stator cores 11A and 11B. Configured. For this reason, since the coil end 14A is configured by the head 4A of the U-shaped segment conductor 5, an axial space for connection is not required, and a required axial space can be shortened. Moreover, since the segment conductor 5 is joined by abutting the tips of the leg portions 4B having a U shape, the axial space for wiring and joining can be shortened. As a result, the axial dimensions of the stator 10 and the rotating electrical machine can be reduced.

  As shown in FIG. 9, the abutting portion at the tip of the leg portion 4B of the segment conductor 5 is inserted into the slot 13, and the inner diameter side portion of the stator core 11 protrudes from the leg portion 4B of the upper segment conductor 5, The engaging portion 4C is formed with the outer diameter side portion retracted. Moreover, in the leg part 4B of the lower segment conductor 5, the outer diameter side part of the stator core 11 protrudes, and the engaging part 4C which the inner diameter side part receded is formed. For this reason, when the leg portions 4B of the upper and lower segment conductors 5 are abutted with each other, the engaging portions 4C are brought into an abutting state in which they are engaged with each other. Note that the shape of the engaging portion 4C is not limited to that formed by the protruding portion and the retreating portion described above, and any shape that engages with each other at the time of matching may be used.

  As welding for joining the butt portions, Tig welding, ultrasonic welding, and the like that are commonly used can be freely selected as long as the joining strength is sufficiently secured. However, it is more desirable to use a welding method in which the influence on the insulating material 6 in the vicinity of the joining portion, thermal deformation of the joining portion, and the like are lighter.

  By joining the butted portions, the segment conductor 5 forms a coil 14 that is electrically conductive with the conductor 5A-conductor 5C-conductor 5B-conductor 5D-conductor 5A. In addition, although the coil 14 of the example of illustration shows the case where it concentrates on the teeth 12, the insertion position of each leg part 4B is changed in the coil 14 which carries out distributed winding. And it can comprise similarly by using the segment conductor 5 by which the shape and dimension of head 4A which connect these leg parts 4B were changed.

  Thus, the butted ends of the leg portions 4B of the segment conductor 5 are formed in the engaging portions 4C that engage with each other. That is, the engaging portions 4C at the ends of the leg portions 4B of the segment conductor 5 can be joined in a state of being engaged with each other. Space can be shortened and the axial dimension of the stator 10 and the rotating electrical machine itself can be reduced.

  A method for manufacturing the stator 10 of the rotating electrical machine having the above configuration will be described below. FIG. 5 is a process diagram showing the manufacturing process of the stator 10.

  In the manufacturing process of this embodiment, first, the segment conductors 5A to 5D are formed (S1). As the segment conductors 5A to 5D, segment conductors 5A and 5B for inserting the leg portions 4B into the slots 13 of one stator core 11A, and segment conductors 5C and 5D for inserting the leg portions 4B into the slots 13 of the other stator core 11B, Mold each one. That is, the segment conductor 5A has a configuration in which the leg portion 4B inserted into the first layer of the slot 13 of the one stator core 11A and the second layer of the adjacent slot 13 is connected by the head portion 4A. Further, the segment conductor 5B has a configuration in which the leg portion 4B inserted into the third layer of the slot 13 of one stator core 11A and the fourth layer of the slot 13 adjacent to each other is connected by the head portion 4A. Further, the segment conductor 5C has a configuration in which the leg portion 4B inserted into the third layer of the slot 13 of the other stator core 11B and the second layer of the slot 13 adjacent to each other is connected by the head portion 4A. Further, the segment conductor 5D has a configuration in which the leg portion 4B inserted into the fourth layer of the slot 13 of the other stator core 11B and the first layer of the adjacent slot 13 is connected by the head portion 4A.

  Next, the insulating material 6 (insulating paper) is inserted into the slots 13 of both the stator cores 11A and 11B (S2). It is desirable that the insulating material 6 is previously formed into a shape that wraps around the leg portion 4B of the segment conductor 5, for example, a cylindrical cross section. By forming in this way, it can be easily inserted into the slot 13, and the leg portion 4B of the segment conductor 5 described later can also be easily inserted.

  Next, the leg portions 4B of the segment conductors 5A and 5B are inserted into one stator core 11A into a space defined by the insulating material 6 inserted into the slot 13. Further, the leg portions 4B of the segment conductors 5C and 5D are inserted into the other stator core 11B in a space defined by the insulating material 6 inserted into the slot 13 (S3). The tips of the leg portions 4B of the segment conductors 5 inserted into the slots 13 of the stator cores 11A and 11B protrude from the other axial end surfaces of the stator cores 11A and 11B, respectively.

  In the above process, the case where the insulating material 6 is first inserted into the slot 13 of the stator cores 11A and 11B and then the leg portion 4B of the segment conductor 5 is inserted into the space defined by the insulating material 6 has been described. However, before inserting them into the slots 13 of the stator cores 11A and 11B, the leg portions 4B of the segment conductor 5 are wrapped with the insulating material 6, and the leg portions 4B wrapped with the insulating material 6 are put into the slots 13 of the stator cores 11A and 11B. You may make it insert.

  Next, the stator cores 11A and 11B are positioned with the side surfaces from which the leg portions 4B of the segment conductor 5 protrude facing each other (S4). In the present embodiment, a positioning jig 20 shown in FIGS. 6 and 7 is used for positioning the stator cores 11A and 11B.

  The positioning jig 20 includes, for example, three or more fixed columns 22 that are erected from the base plate 21 at a predetermined interval in the circumferential direction. The fixed struts 22 extend in the axial direction with respect to the outer circumferences of the stator cores 11A and 11B, respectively, and are arranged so as to surround the stator cores 11A and 11B with their radially inner surfaces facing the outer circumferences of the stator cores 11A and 11B. . The fixed support 22 includes a movable member 23 that is movable in the radial direction and that contacts the outer periphery of the stator cores 11A and 11B when moving inward in the radial direction to position the stator cores 11A and 11B in the radial direction.

  Further, the fixed column 22 is arranged at the central portion in the axial direction of the fixed column 22 so as to be movable in the radial direction, and protrudes inward from the fixed column 22 when moving inward in the radial direction, and is arranged on the upper side. A movable claw 24 that contacts the lower surface of the stator core 11A and supports the stator core 11A is provided. Further, any one fixed support 22 is movable in the radial direction, and engages with a positioning key groove 11D provided on the outer periphery of the stator cores 11A and 11B when moving inward in the radial direction to engage the stator core 11A, A key 25 for positioning the circumferential position of 11B is provided.

  A method for assembling the stator 10 using the positioning jig 20 having the above structure will be described below. The positioning jig 20 is arranged with the base plate 21 facing down so that each fixed support 22 is erected upward. The movable member 23, the movable claw 24, and the key 25 arranged on each fixed support 22 are all moved radially outward.

  In the state surrounded by the fixed column 22 of the positioning jig 20 in this state, for example, the state where the head 4A of the segment conductor 5 on which the other stator core 11B is mounted is on the lower side is disposed. Insert with. When inserting, the inside of the fixed support 22 is inserted as a guide. Further, the position in the phase direction is roughly determined and inserted so that the key groove 11D provided on the outer periphery of the other stator core 11B faces the key 25 of the positioning jig 20.

  In the inserted other stator core 11B, the head 4A of the mounted segment conductor 5 is in contact with the base plate 21 of the positioning jig 20, and the end of the leg 4B of the segment conductor 5 is projected upward from the stator core 11B. It is arranged with. The other stator core 11 </ b> B is disposed so that the outer peripheral portion thereof is surrounded by the fixed column 22, and the key groove 11 </ b> D provided on the outer periphery faces the key 25 provided on any one of the fixed columns 22.

  Next, the movable claw 24 provided on the fixed support 22 is moved inward in the radial direction, and the movable claw 24 is protruded inward from the fixed support 22. The movable claws 24 protruded inwardly protrude above the outer peripheral area of the other stator core 11B inserted.

  Next, the segment conductor 5 that is disposed above, for example, with the one stator core 11 </ b> A attached thereto is inserted with the head 4 </ b> A on the upper side. When inserting, the inside of the fixed support 22 is inserted as a guide. Further, the position in the phase direction is roughly determined and inserted so that the key groove 11D provided on the outer periphery of the one stator core 11A faces the key 25 of the positioning jig 20. And the outer peripheral area | region of the lower surface of one stator core 11A is mounted in the upper surface of the movable nail | claw 24 protruded from the fixed support | pillar 22. FIG. Thereby, one stator core 11A located on the upper side rides on the upper part of the movable claw 24 and is positioned in the height direction.

  One of the inserted stator cores 11A is arranged with the head 4A of the attached segment conductor 5 on the upper side and the tip of the leg 4B of the segment conductor 5 protruding downward from the stator core 11A. One stator core 11 </ b> A is arranged so that the outer peripheral portion thereof is surrounded by the fixed support 22 and the key groove 11 </ b> D provided on the outer periphery faces the key 25 provided on any fixed support 22.

  In this state, the leg 4B tip of the segment conductor 5 projecting downward from one stator core 11A disposed on the upper side and the leg of the segment conductor 5 projecting upward from the other stator core 11B disposed on the lower side. 4B tip contacts in a butted state.

  Next, the key 25 provided on any one of the fixed columns 22 is protruded inward in the radial direction and engaged with the key grooves 11D of the stator cores 11A and 11B arranged vertically, and the stator cores 11A and 11B arranged vertically. Is positioned in the phase direction.

  Finally, the movable member 23 provided on each fixed column 22 is simultaneously projected inward in the radial direction, and the movable member 23 is brought into contact with the outer peripheral surfaces of the upper and lower stator cores 11A and 11B to fix the upper and lower stator cores 11A and 11B. Thus, the stator cores 11A and 11B divided in the axial direction can be positioned by being spaced apart from each other by a predetermined distance and aligned in the axial direction, the radial direction, and the phase direction.

  In this state, the leg 4B tip of the segment conductor 5 protruding downward from one stator core 11A on the upper side, the leg 4B tip of the segment conductor 5 protruding upward from the other stator core 11B on the lower side, Are aligned with high accuracy. Further, the abutting portions at the tips of the leg portions 4B of the segment conductors 5 protruding from the upper and lower stator cores 11A and 11B are arranged in the radial direction along the slot 13, and the periphery thereof is a space portion between the upper and lower stator cores 11A and 11B. Is in a state that exists.

  Next, a joining step is performed in which the butted portions at the ends of the leg portions 4B of the segment conductors 5 protruding from the upper and lower stator cores 11A and 11B are joined by welding or the like (S5). As shown in FIG. 7, the joining step is performed by placing a pressing jig 26 above the stator cores 11 </ b> A and 11 </ b> B positioned by the positioning jig 20 and pressing the pressing jig 26. Thereby, the butt portion is brought into a state in which an appropriate contact pressure is applied to the butt portion when the segment conductor 5 mounted on the upper stator core 11A is pressed downward.

  For joining, the joining jigs 30A and 30B are inserted into the inner diameter side of the stator cores 11A and 11B, and the butted portions arranged in the radial direction are held by one joining jig 30A from one side as shown in FIGS. The other joining jig 30B is brought into contact with the other of the butted portions and welded. The welding of the butt portion is sequentially performed from the butt portion located on the inner diameter side of the stator cores 11A and 11B toward the butt portion located on the outer diameter side. As described above, by joining the butt portions in a state where an appropriate contact pressure is applied, the joining quality can be improved and the structure of the necessary equipment jig can be made relatively simple. At this stage, the pressing jig 26 is removed from the upper surface of the stator 10 and returned to the standby position.

  As described above, the stator core 11 is constituted by a pair of stator cores 11A and 11B fixedly arranged at predetermined intervals in the axial direction, and the butted end portion of the leg portion 4B of the segment conductor 5 is between the pair of stator cores 11A and 11B. It is joined in the space. For this reason, using the space between the pair of stator cores 11 </ b> A and 11 </ b> B, the butted ends of the leg portions 4 </ b> B of the segment conductor 5 can be joined to each other, and the joining can be easily performed.

  Next, an insulation process is performed in which the outer periphery of the leg portion 4B of the segment conductor 5 including the joint portion exposed between the stator cores 11A and 11B is wrapped with a thin insulating material 6 (S6). In this insulation process, for example, as shown in FIG. 10, the insulating paper 6 </ b> A previously molded into an E shape is disposed so as to be sandwiched between the leg portions 4 </ b> B of the segment conductors 5. Furthermore, it can be carried out by placing the leg portions 4B of all the segment conductors 5 so as to be wrapped by the insulating paper 6B previously molded into a U shape. By performing the insulation treatment in this manner, it is possible to save the space required for the joint portion of the segment conductor 5 including the insulating material 6 while ensuring good electrical insulation, and the stator 10 and the rotating electrical machine itself Can be reduced in size. In FIG. 10, the U-shaped insulating paper 6 </ b> B is inserted from the outer diameter side, but the positioning jig 20 and the portion to be buffered are inserted from the inner diameter side. Further, all the insulating paper 6B may be inserted from the inner diameter side.

  Next, the positioning jig 20 is removed from the inside of the stator core in a state where a temporary holding jig (not shown) is inserted between the upper and lower stator cores 11A and 11B. As a procedure for removing the positioning jig 20, for example, the key 25 and the movable claw 24 are moved radially outward, and then each movable member 23 is moved radially outward. By doing so, the stator 10 is released from the positioning state by the positioning jig 20, and the stator 10 can be detached from the positioning jig 20. FIG. 11 is a side view of the stator 10 in an assembled state removed from the positioning jig 20.

  Thereafter, the spacer core 11C divided in the circumferential direction is inserted between the upper and lower stator cores 11A and 11B from the outside of the stator core (S7), and the spacer core 11C and the stator cores 11A and 11B are fixed by welding or the like. , 11B are integrated (S8). The stator cores 11A and 11B divided in the axial direction may be molded with an insulator such as resin. Before removing the positioning jig 20, insert a plurality of spacer cores 11C divided from the outside of the stator core into parts other than the part where the positioning jig is inserted, and then remove the positioning jig 20; You may carry out in the procedure of inserting the spacer core 11C in the site | part in which the positioning jig 20 was inserted.

  In the method of manufacturing the stator 10 described above, first, the pair of stator cores 11A and 11B are fixedly arranged at a predetermined interval in the axial direction. Next, the leg portions 4B of the plurality of U-shaped segment conductors 5 are inserted into the slots 13 from both axial ends of the pair of stator cores 11A and 11B. The ends of the leg portions 4B of the segment conductor 5 are butted in the space between the pair of stator cores 11A and 11B, and the butted ends are joined together to constitute the coil 14. For this reason, it is necessary to insert the spacer core 11C into the space between the pair of stator cores 11A and 11B, and to fix the spacer core 11C and the pair of stator cores 11A and 11B together by welding or the like. However, when connecting the segment conductor 5 with the coil end 14A, a conductor bending processing facility that requires high rigidity can be dispensed with, and the facility cost can be reduced.

  In addition, as a manufacturing apparatus used in the above manufacturing method, a positioning jig 20 is provided as a holding unit that holds the pair of stator cores 11A and 11B at a predetermined interval in the axial direction. Also, in the space between the pair of stator cores 11A, 11B, the butted ends of the leg portions 4B of the U-shaped segment conductor 5 inserted into the slots 13 from both axial ends of the pair of stator cores 11A, 11B, respectively. Are provided with joining jigs 30A and 30B as joining means. That is, a manufacturing apparatus having a relatively simple structure can be obtained, and positioning accuracy necessary for obtaining a stator winding structure using a rectangular wire can be ensured at a relatively low equipment cost.

  In the present embodiment, the following effects can be achieved.

  (A) A stator 10 of a rotating electrical machine having a stator core 11 having a plurality of slots 13 and a multiphase coil 14 mounted in the slots 13 while forming coil ends 14A on both ends of the stator core 11, respectively. It is. The coil 14 is configured by joining the ends of the leg portions 4B, which are joined by inserting the leg portions 4B of the plurality of U-shaped segment conductors 5 into the slots 13 from both axial ends of the stator core 11, respectively. did. That is, since the coil end 14A is configured by the head portion 4A of the U-shaped segment conductor 5, an axial space for connection becomes unnecessary, and the required axial space can be shortened. Moreover, since the segment conductor 5 is joined by abutting the tips of the leg portions 4B having a U shape, the axial space for wiring and joining can be shortened. As a result, the axial dimensions of the stator 10 and the rotating electrical machine can be reduced.

  (A) The stator core 11 is composed of a pair of stator cores 11A and 11B fixedly arranged at predetermined intervals in the axial direction, and the butted end of the leg 4B of the segment conductor 5 is between the pair of stator cores 11A and 11B. Joined in space. For this reason, using the space between the pair of stator cores 11 </ b> A and 11 </ b> B, the butted ends of the leg portions 4 </ b> B of the segment conductor 5 can be joined to each other, and the joining can be easily performed.

  (C) The butted ends of the leg portions 4B of the segment conductor 5 are formed in the engaging portion 4C as a shape that engages with each other. That is, the engaging portions 4C at the ends of the leg portions 4B of the segment conductor 5 can be joined in a state of being engaged with each other. Space can be shortened and the axial dimension of the stator 10 and the rotating electrical machine itself can be reduced.

  (D) The butted end joined at the tip of the leg 4B of the segment conductor 5 is coated with an insulating material 6. For this reason, it is possible to save the space required for conductor joining including the insulating material 6 while ensuring good electrical insulation, and it is possible to reduce the size of the stator 10 and the rotating electrical machine itself.

  (E) A stator 10 of a rotating electrical machine having a stator core 11 having a plurality of slots 13 and multiphase coils 14 mounted in the slots 13 while forming coil ends 14A on both ends of the stator core 11, respectively. It is a manufacturing method. That is, the pair of stator cores 11A and 11B are fixedly arranged at a predetermined interval in the axial direction. Then, the leg portions 4B of the plurality of U-shaped segment conductors 5 are inserted into the slots 13 from both axial ends of the pair of stator cores 11A and 11B, and the tips of the leg portions 4B of the segment conductors 5 are paired with the pair of stator cores 11A. , 11B, but the butt ends are joined together to form the coil 14. For this reason, it is necessary to insert the spacer core 11C into the space between the pair of stator cores 11A and 11B, and fix the spacer core 11C and the pair of stator cores 11A and 11B by welding or the like. Thus, when connecting the segment conductors 5, it is possible to eliminate the need for conductor bending processing equipment that requires high rigidity, and to reduce equipment costs.

  (F) A manufacturing apparatus used in the above manufacturing method, and a positioning jig 20 as a holding means for holding the pair of stator cores 11A and 11B at predetermined intervals in the axial direction, and a space between the pair of stator cores 11A and 11B 3A, a joining jig 30A as a joining means for joining the butted ends of the leg portions 4B of the U-shaped segment conductors 5 inserted into the slots 13 from both axial ends of the pair of stator cores 11A and 11B, respectively. , 30B. That is, a manufacturing apparatus having a relatively simple structure can be obtained, and positioning accuracy necessary for obtaining a stator winding structure using a rectangular wire can be ensured at a relatively low equipment cost.

4A Head 4B Leg 4C Engagement part 5, 5A-5D Segment conductor 6 Insulating material 10 Stator 11, 11A, 11B Stator core 11C Spacer core 11D Key groove 12 Teeth 13 Slot 14 Coil 14A Coil end 14B Coil part 20 Positioning jig (Holding means)
21 Base plate 22 Fixed column 23 Movable member 24 Movable claw 25 Key 30A, 30B Joining jig (joining means)

Claims (6)

A stator for a rotating electrical machine having a stator core having a plurality of slots, and a multi-phase coil mounted in the slots while forming coil ends on both ends of the stator core,
The coil has a structure in which legs of a plurality of U-shaped segment conductors are inserted into the slots from both ends in the axial direction of the stator core and joined together at the ends of the legs. Electric stator. The stator core is composed of a pair of stator cores fixedly arranged at predetermined intervals in the axial direction,
2. The stator of a rotating electrical machine according to claim 1, wherein a butt end portion of a leg end of the segment conductor is joined in a space between the pair of stator cores.   The stator of a rotating electrical machine according to claim 1 or 2, wherein the butted ends of the leg portions of the segment conductors are formed into shapes that engage with each other.   The stator of a rotating electrical machine according to any one of claims 1 to 3, wherein the butted end portion joined at the end of the leg portion of the segment conductor is coated with an insulating material. A stator manufacturing method for a rotating electrical machine, comprising: a stator core having a plurality of slots; and a multi-phase coil mounted in the slot while forming coil end portions on both ends of the stator core, respectively.
A pair of stator cores are fixedly arranged at predetermined intervals in the axial direction,
The coils are inserted into the slots, respectively, from both ends of the pair of stator cores in the axial direction with legs of U-shaped segment conductors.
Butt ends of the segment conductors in the space between the pair of stator cores,
A method of manufacturing a stator for a rotating electrical machine, wherein the butted ends are joined to each other. An apparatus for manufacturing a stator for a rotating electrical machine used in the manufacturing method according to claim 5,
Holding means for holding the pair of stator cores at predetermined intervals in the axial direction;
A joining means for joining the butted ends of the leg-shaped end portions of the U-shaped segment conductors inserted into the slots from both axial ends of the pair of stator cores in the space between the pair of stator cores, respectively. An apparatus for manufacturing a stator of a rotating electric machine, comprising:

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