JP2011172384A - Rotary electric machine armature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine armature, capable of suppressing a radial direction width which a coil end occupies, and capable of suppressing complication of a manufacturing process and enlargement in an axial direction. <P>SOLUTION: A polymerization region 40 where a pair of a one side bonding extension 23a and an other side bonding extension 23b, which are bonded by an inter-segment bonding part 30, are overlapped when viewed from one side in the radial direction R, is formed with the inter-segment bonding part 30 as a tip. The rotary electric machine armature includes a plurality of radial direction arrays 31. In each of the plurality of radial direction arrays 31, a plurality of polymerization regions 40 where circumferential direction C positions of polymerization bases in which polymerization of the one side bonding extension 23a and the other side bonding extension 23b in the polymerization region 40 start are matched are arranged in the radial direction R. The plurality of polymerization regions 40 constituting one radial direction array 31 are formed so that the inter-segment bonding parts 30 at the tips of the adjacent polymerization regions 40 in the radial direction R are positioned in the mutually different circumferential direction C positions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides an armature core comprising a plurality of slots extending in the axial direction of a cylindrical core reference surface, the armature core being dispersedly arranged in the circumferential direction of the core reference surface, and a plurality of segment conductors joined together. And a coil wound around a core.

  In order to increase the space factor of the coil in the armature for rotating electrical machines, the conductor side portions of the plurality of U-shaped segment conductors are regularly arranged in the slots of the armature core, A technique for forming a coil by joining joining extension portions of different segment conductors extending in the axial direction is already known (see, for example, Patent Document 1). In the configuration including such a coil, as shown in FIG. 7 of Patent Document 1, there are many inter-segment joints formed by joining the joint extension portions of the segment conductors on the outer side in the axial direction of the armature core. Be placed. Therefore, in such a configuration, it is difficult to ensure electrical insulation between the adjacent inter-segment joints. It is possible to ensure such insulation by insulating the surface of the inter-segment joints or providing an insulating member between the adjacent inter-segment joints. If the distance is short, it is difficult to take such measures.

  Regarding the above problem, in Patent Document 2 below, as shown in FIG. 10 of the document, the diameter of the pair of joint extension parts connected at the inter-segment joint part is inclined outward in the radial direction. A technique for securing a distance between joint portions between adjacent segments in a direction is disclosed. Further, in Patent Document 3 below, a segment conductor inserted from one side of the armature core in the axial direction and a segment conductor inserted from the other side of the armature core in the axial direction are alternately arranged, thereby connecting the inter-segment joints. Has been disclosed in which the distance between adjacent inter-segment joints is ensured by dispersing them on both axial sides of the armature core.

Japanese Patent No. 319638 (FIG. 7 etc.) JP 2004-32892 A (FIG. 10 etc.) Japanese Patent No. 4187914

  However, in the configuration described in Patent Document 2, in order to secure the distance between the joint portions between the segments adjacent in the radial direction with respect to all the joint portions between the segments, as shown in FIG. For the inter-segment joint located on the radially outer side, the pair of joint extension parts joined at the joint are radially outward at a larger angle than the inter-segment joint located on the radially inner side. Need to bend. Therefore, depending on the number of layers of the coil arranged in the slot, the bending angle of the joint extension part with respect to the joint part between the segments located on the radially outermost side becomes excessive, and the radial width occupied by the coil end part becomes excessive. There is a risk. In addition, the bending angle of the bonding extension portion differs for each inter-segment bonding portion arranged along the radial direction, and the bending extension to the outer side in the radial direction with respect to the bonding extension portion arranged close to the radial direction. It is necessary to perform processing, and there is a possibility of complicating the manufacturing process. Moreover, in the structure of the said patent document 3, since the junction part between segments disperse | distributes to the axial direction both sides of an armature core, there exists a possibility of causing the enlargement in the axial direction of the armature for rotary electric machines, or the complexity of a manufacturing process. is there.

  Therefore, it is desired to realize an armature for a rotating electrical machine that can suppress the radial width occupied by the coil end portion and can also suppress the complexity of the manufacturing process and the increase in size in the axial direction.

  According to the present invention, the electric machine comprises: an armature core in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface; and a plurality of segment conductors joined together. A characteristic configuration of the armature for a rotating electrical machine provided with a coil wound around a child core is that the segment conductor includes a conductor side portion disposed along the axial direction in the slot, and the conductor side portion A joint extension portion extending in an axial direction from at least one end portion with respect to the armature core, and the coil extends from the conductor side portions respectively disposed in the different slots. An inter-segment joint formed by joining tip portions of the one-side joint extension portion and the other-side joint extension portion, which are the joint extension portions, on the outer side in the axial direction with respect to the armature core, A pair joined at the joint between segments A circumferential extension portion in which at least one of the one-side joint extension portion and the other-side joint extension portion extends in the circumferential direction from the conductor side portion of the extension source toward the inter-segment joint portion. And a superposition region where the one-side joint extension portion and the other-side joint extension portion overlap when viewed from one side in the radial direction is formed with the inter-segment joint portion as a tip portion, and the superposition region in the superposition region A radial direction in which a plurality of the polymerization regions in which the circumferential positions of the polymerization bases that are the bases where the polymerization of the one-side bonding extension and the other-side bonding extension starts are aligned are arranged along the radial direction. A plurality of array portions, and a plurality of the overlapping regions constituting one radial array portion are circumferential positions where the inter-segment joints at the distal ends of the overlapping regions adjacent to each other in the radial direction are different from each other. Position In that it is formed so as to.

According to the above-described characteristic configuration, in the radial arrangement portion in which a plurality of polymerization regions (polymerization base portions) are arranged in the radial direction, the inter-segment joints are shifted in the circumferential direction between the polymerization regions adjacent in the radial direction. A distance between the inter-segment joints can be ensured. Therefore, it becomes easy to ensure the electrical insulation between the joint parts between segments, and it becomes easy to improve electrical insulation also as the whole coil.
Moreover, according to said characteristic structure, since the distance between the joint parts between adjacent segments is ensured by distributing the position of the joint part between segments in the circumferential direction, the problem that a coil end part enlarges to radial direction. Is unlikely to occur.
Furthermore, according to the above-described characteristic configuration, the distance between the inter-segment joints can be ensured between the overlapping regions in the radial direction, so that the inter-segment joints are dispersed on both sides in the axial direction of the armature core. There is no necessity. Therefore, it is easy to adopt a configuration in which the inter-segment joint is arranged only on one side of the armature core in the axial direction, which increases the size and complexity of the manufacturing process in the axial direction of the armature for a rotating electrical machine. Can be suppressed.

  Here, the superposition | polymerization area | region has the circumferential direction bending part bent to any one side of the circumferential direction as it goes to the junction part between the said superposition | polymerization base parts, The plurality which comprises one said radial direction arrangement | sequence part It is preferable that the overlapping regions are formed such that the bending directions of the circumferentially bent portions provided in the overlapping regions adjacent to each other in the radial direction are different from each other.

According to this configuration, the bending angle of the circumferential bending portion is larger than when the bending directions of the circumferential bending portions provided in the overlapping regions adjacent to each other in the radial direction are the same direction. It is possible to secure the distance between the joint portions between the segments while suppressing the above. Therefore, the process for forming the circumferential bent portion can be simplified, and the manufacturing process can be prevented from becoming complicated.
In addition, since the bending direction of the circumferential bending portion provided in the overlapping regions adjacent to each other in the radial direction is different from each other, the leading end portion of the overlapping regions adjacent to each other in the radial direction. The formation position of a certain inter-segment joint can be brought close to the armature core. Therefore, the axial height of the armature for a rotating electrical machine can be kept low.

  In addition, as described above, the plurality of overlapping regions constituting one radial array portion are arranged such that the bending directions of the circumferential bending portions provided in the overlapping regions adjacent to each other in the radial direction are different from each other. In the formed configuration, the overlapping region from the circumferential bent portion toward the inter-segment joint is linearly inclined with respect to a direction parallel to the axial direction when viewed from one radial side. Preferably it is formed.

  According to this configuration, the configuration of the circumferentially bent portion can be simplified, and the manufacturing process can be prevented from becoming complicated.

  In addition, as described above, the plurality of overlapping regions constituting one radial array portion are arranged such that the bending directions of the circumferential bending portions provided in the overlapping regions adjacent to each other in the radial direction are different from each other. In the formed configuration, the circumferentially bent portion is a first circumferentially bent portion, and the overlapping region is formed between the first circumferentially bent portion and the inter-segment bonded portion in the circumferential direction. A second circumferential bending portion that bends in a direction opposite to the bending direction of the circumferential bending portion, and the extending direction of the overlapping region from the second circumferential bending portion to the inter-segment bonding portion is one radial direction A configuration in which the overlapping regions in the radial direction are parallel to each other when viewed from the side is also preferable.

  According to this configuration, it is easy to ensure the distance between the inter-segment joints even between the different radial arrangement portions, and it is possible to more reliably ensure the electrical insulation between the inter-segment joints. It becomes.

  Further, the segment conductor is constituted by a linear conductor coated with an insulating film, and in the inter-segment joint portion, the insulation is performed for joining the one-side joint extension portion and the other-side joint extension portion. It is preferable that at least a part of the film is missing.

  When joining the segment conductors by welding or the like, it is common to peel off the insulating film of the portion to be a joint in the linear conductor in advance, or to remove the insulating film by heat or the like during the joining operation It is. This configuration is suitable for a case where at least a part of the insulating film is lost in such an inter-segment joint, and more reliably ensures electrical insulation between the inter-segment joints. Can do.

  In addition, it is preferable that the overlapping regions in which the radial positions of the radially arranged portions that are different from each other match each other have the same positional relationship in the circumferential direction of the inter-segment joints of the overlapping regions.

  According to this configuration, the distance between the inter-segment joints can be ensured even between the different radial array portions, and the electrical insulation between the inter-segment joints can be more reliably ensured. In addition, since processing to the same direction side in the circumferential direction is performed on multiple overlapping regions with the same radial position, processing can be performed simultaneously on multiple overlapping regions with different circumferential positions. It becomes. Therefore, complication of the manufacturing process can be suppressed.

It is a perspective view of the stator which concerns on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the coil which concerns on embodiment of this invention. It is an enlarged view of the junction part vicinity between segments in FIG. It is an expansion schematic diagram of the junction part vicinity of the segment of the coil which concerns on embodiment of this invention. It is a schematic diagram which shows the arrangement | positioning state of the coil which concerns on a comparative example. It is a perspective view of the stator which concerns on another embodiment of this invention. It is a figure corresponding to FIG. 3 which concerns on another embodiment of this invention. It is an expansion schematic diagram of the junction part vicinity of the segment of the coil which concerns on another embodiment of this invention.

  An embodiment of an armature for a rotating electrical machine according to the present invention will be described with reference to the drawings. Here, a case where the present invention is applied to a stator of an inner rotor type rotating electrical machine will be described as an example. As shown in FIGS. 1, 4, and the like, the stator 1 according to the present embodiment includes a superposed region 40 having an inter-segment joint portion 30 that is a joint portion between the tip portions of the segment conductors 21 constituting the coil 20. Is provided with a circumferentially bent portion 41 that bends to any one side in the circumferential direction C, and a plurality of overlapping regions 40 constituting one radially arranged portion 31 are adjacent to each other in the radial direction R. It is characterized in that it is formed so that the bending direction of the circumferential bending portion 41 provided is different from each other. Thereby, the distance between the junction parts 30 which adjoin can be ensured appropriately, and it becomes possible to improve the electrical insulation between the junction parts 30 between segments. Hereinafter, the configuration of the stator 1 according to the present embodiment will be described in detail.

In the following description, unless otherwise specified, the “axial direction L”, “circumferential direction C”, and “radial direction R” are defined with reference to the axial center of a cylindrical core reference plane described later. In the following description, “one axial direction L1” represents the upper side along the axial direction L in FIG. 1, and “other axial direction L2” represents the lower side along the axial direction L in FIG. It shall represent. In the following description, as shown in FIG. 1, “circumferential one side C <b> 1” represents the counterclockwise direction side when the stator 1 (stator core 2) is viewed from the axial one side L <b> 1. The other direction side C2 "represents the clockwise direction side when the stator 1 (stator core 2) is viewed from the one axial side L1. In the following description, the directions of the coil 20 and the segment conductor 21 constituting the coil 20 are defined as directions in a state where the coil 20 and the segment conductor 21 are mounted on the stator core 2.
In the present embodiment, the stator 1 and the stator core 2 correspond to the “armature for rotating electrical machine” and the “armature core” in the present invention, respectively.

1. Overall Configuration of Stator The overall configuration of the stator 1 according to this embodiment will be described with reference to FIG. As shown in FIG. 1, the stator 1 includes a stator core 2 and a coil 20 and is configured as an armature for a rotating electrical machine. In this specification, “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary. Yes.

  The stator core 2 is formed using a magnetic material, and a plurality of slots 3 extending in the circumferential direction C of the core reference surface are provided in order to enable the coil 20 to be wound. The stator cores 2 are formed in a distributed manner (48 in the example). Here, the “cylindrical core reference plane” is a virtual plane that serves as a reference for the arrangement and configuration of the slots 3. In this embodiment, as shown in FIG. 1, the core inner peripheral surface which is a virtual cylindrical surface including the end surface of the radially inner side R1 of the teeth 5 positioned between the slots 3 adjacent to each other in the circumferential direction C is formed. The cylindrical core inner peripheral surface can be defined as a “cylindrical core reference surface” in the present invention. Moreover, it is concentric with the cylindrical inner peripheral surface, and the cross-sectional shape in the axial direction L (when viewed along the axial direction L) is similar to the cross-sectional shape in the axial direction L of the core inner peripheral surface. Cylindrical surfaces (including virtual surfaces) in relation can also be “cylindrical core reference surfaces” in the present invention. For example, in the present embodiment, as shown in FIG. 1, the stator core 2 is formed in a cylindrical shape. Therefore, the outer peripheral surface of the stator core 2 excluding the mounting protrusions is defined as a “cylindrical core reference surface”. You can also.

  The stator core 2 has a plurality of slots 3 distributed in the circumferential direction C on the inner circumferential surface of the cylindrical core. The plurality of slots 3 are arranged at predetermined circumferential intervals, and are provided so as to extend in the axial direction L. The slots 3 are formed to have the same cross-sectional shape (rectangular shape in this example) in a plane orthogonal to the axial direction L.

  In the present embodiment, the stator 1 is a stator used in a rotating electrical machine driven by three-phase alternating current (U phase, V phase, W phase). Therefore, the U-phase, V-phase, and W-phase slots 3 are arranged in the stator core 2 so as to repeatedly appear along the circumferential direction C. In this example, the stator core 2 has two slots 3 adjacent to each other for the U phase and two slots 3 adjacent to each other for the V phase so that the number of slots per pole per phase is “2”. And two adjacent slots 3 for the W phase are formed so as to repeatedly appear along the circumferential direction C in the order of description. The coil 20 is also formed in a three-phase configuration (U phase, V phase, W phase), and the coil 20 is wound around the stator core 2 by wave winding as will be described in detail later. In the present embodiment, the coils of each phase included in the coil 20 have the same configuration. Therefore, in the following description, the coils for each phase will be described without distinction unless necessary.

  And although illustration is abbreviate | omitted, in the radial direction inner side R1 of the stator 1 (stator core 2), the rotor as a field magnet provided with the permanent magnet or the electromagnet is arrange | positioned so that relative rotation with respect to the stator 1 is possible. Then, the rotor is rotated by the rotating magnetic field generated from the stator 1. That is, the stator 1 according to the present embodiment is an inner rotor type rotating field type stator for a rotating electrical machine.

  Note that the stator core 2 as described above is, for example, a laminated structure in which a plurality of annular plate-shaped electromagnetic steel plates are laminated, or a powder material formed by pressure-forming a magnetic material that is a magnetic material powder. It can be formed as a main component. In the present embodiment, the stator core 2 is formed with a plurality of slots 3 so that the number of slots per phase per pole is “2”. Of course, the number of slots per phase per pole is It can be changed as appropriate. For example, the number of slots per phase per pole can be set to “1” or “3”. Further, the number of phases of the AC power source for driving the rotating electrical machine can be changed as appropriate, and can be set to, for example, “1”, “2”, “4”, and the like.

2. Next, the configuration of the coil 20 according to the present embodiment will be described in detail. The coil 20 is configured by sequentially joining a plurality of U-shaped segment conductors 21, and in each slot 3, an n-layer winding structure in which n conductor side portions 22 to be described later are arranged in the radial direction R. Has been. Here, n is an integer greater than or equal to 2 (for example, an integer greater than or equal to 2 and less than 10; in particular, an even number greater than or equal to 2 is desirable), the torque required for the rotating electrical machine, the allowable back electromotive force, and the like. Is set according to In this embodiment, the coil 20 has a 10-layer winding structure, and in each slot 3, 10 conductor side portions 22 are arranged in a line so as to be stacked in the radial direction R. In the present specification, the position of the conductor side portion 22 in each slot 3 will be described with layer numbers from 1 to n from the radially outer side R2 toward the radially inner side R1. In FIG. 1, for the sake of simplicity, only the segment conductor 21 in which the conductor side portions 22 are arranged in the four layers (first to fourth layers) on the radially outer side R2 is shown. Further, in FIG. 1, for the sake of simplicity, a junction between turns, a junction for forming a neutral point, a connection with a terminal for connection to a power source, and a deformed segment for forming these Conductors and bent parts are omitted.

  As shown in FIG. 1, the segment conductor 21 is composed of a linear conductor whose cross-sectional shape in a plane orthogonal to the extending direction (equal to the energizing direction) is rectangular. The material constituting this linear conductor can be, for example, copper or aluminum. Further, the surface of the linear conductor is covered with an insulating film made of a resin or the like (for example, polyimide or the like) except for an electrical connection location between different members (a location where an inter-segment joint 30 is described later). . In addition, since it is well-known to comprise a coil using several such U-shaped segment conductors (for example, refer to the said patent documents 1-3 etc.), the segment which is the principal part of this invention here Description will be made mainly on the inter-joint portion 30 and the overlapping region 40, and configurations related thereto, and publicly known techniques shall be appropriately applied to points that are not particularly described.

  FIG. 2 is a schematic diagram for explaining an arrangement state of the coil 20 (segment conductor 21) in the present embodiment. Specifically, FIG. 2 (a) corresponds to a view in which two segment conductors 21 shown by broken lines in FIG. 1 are expanded in the circumferential direction C (in a planar shape) when viewed from one axial side L1. FIG. 2B corresponds to the developed one viewed from the radially outer side R2. In FIG. 2, in order to clarify the concept of the present invention, the aspect ratio of each member and the magnitude relationship between different members are different from those in FIG.

  As shown in FIG. 2, the segment conductor 21 includes a pair of conductor side portions 22 arranged along the axial direction L in a pair of slots 3 having different circumferential C positions, and the pair of conductor conductors 22 on the outer side in the axial direction of the stator core 2. And a pair of joint extending portions 23 (23a, 23a, 23a) extending from the other end of each of the pair of conductor side portions 22 to the outside in the axial direction of the stator core 2. 23b). As shown in FIG. 1, the conductor side portion 22 is disposed in the slot 3 such that the shorter side portion in the cross section perpendicular to the extending direction of the linear conductor is along the radial direction R. Further, as shown in FIG. 1, an insulating sheet 4 is inserted inside the slot 3 so as to partially protrude from the axial end portion of the stator core 2, and the electric power between the coil 20 and the stator core 2 is inserted. Insulative insulation.

  Here, each segment conductor 21 basically has the same shape, although the width in the circumferential direction C (interval between the pair of conductor side portions 22) varies depending on the arrangement position of the radial direction R with respect to the stator core 2. . Therefore, although not shown in FIG. 2, the joint extension 23 on the other circumferential side C2 of the segment conductor 21 on the other circumferential side C2 in FIG. It has the same configuration as the joint extension 23 on the other circumferential side C2.

  As shown in FIG. 1, in a state where the segment conductor 21 is mounted on the stator core 2, the unique crossing portion 27 is positioned on the other axial side L <b> 2 with respect to the stator core 2, and the joint extension portion 23 is on the stator core 2. On the other hand, it is located on the one side L1 in the axial direction. In the example shown in FIGS. 1 and 2, the unique crossing portion 27 has a V-shape, but any shape can be adopted for the unique crossing portion 27.

  As shown in FIGS. 2 and 3, a first bent portion 28 and a second bent portion 29 are formed in each of the pair of joint extending portions 23 included in the segment conductor 21. FIG. 3 is an enlarged view of the vicinity of the inter-segment joint 30 (details will be described later) in FIG. The first bent portion 28 is a bent portion for bending the pair of joint extending portions 23 included in the segment conductor 21 in a direction away from each other in the circumferential direction C. Further, the second bent portion 29 bends the pair of joint extending portions 23 after being bent by the first bent portion 28 in a direction approaching each other in the circumferential direction C, and the distal end side of the pair of joint extending portions 23. This is a bent portion for making the extending directions of the portions (portions where the bonding surface 25 described later) is formed parallel to each other. In this example, the second bent portion 29 is formed such that the extending direction of the tip side portion is parallel to the axial direction L with respect to the position where the second bent portion 29 is formed. On the other hand, a circumferential bent portion 41, which will be described later, is formed close to the tip side. Therefore, in FIG. 2 and FIG. 3, the portion where the extension direction after bending by the second bending portion 29 is parallel to the axial direction L does not appear clearly, but the state before the formation of the circumferential bending portion 41 Then, the extension direction of the joint extension portion 23 is parallel to the axial direction L at the tip side portion from the second bent portion 29. And by providing such a 1st bending part 28 and the 2nd bending part 29, between the 1st bending part 28 and the 2nd bending part 29 in each of a pair of joining extension part 23, FIG. As shown, a circumferentially extending portion 24 extending in the circumferential direction C is formed. Here, “extending in the circumferential direction” does not necessarily mean extending along the circumferential direction C, but is a concept including an extension direction having a component in the circumferential direction C. Therefore, the shape seen from either one of the axial directions L of the circumferentially extending portion 24 may be, for example, an arc shape along the circumferential direction C, or the starting point in the circumferential direction C (the circumference of the first bent portion 28). It is good also as the linear form which connects a direction C position) and an end point (the circumferential direction C position of the 2nd bending part 29).

  Such a segment conductor 21 can be attached to the stator core 2 from the other axial side L2, or can be attached to the stator core 2 from the radially inner side R1, for example. The first bent portion 28 and the second bent portion 29 can be formed after the segment conductor 21 is attached to the stator core 2.

  By the way, as described above, the stator core 2 includes two adjacent slots 3 for the U phase, two adjacent slots 3 for the V phase, and two adjacent slots 3 for the W phase. Are repeatedly formed in the order of description along the circumferential direction C. In accordance with such an arrangement configuration of the slots 3, in this embodiment, as shown in FIG. 2, the pair of conductor side portions 22 included in the segment conductor 21 is a distance corresponding to 6 times the arrangement pitch of the slots 3. They are arranged in a pair of slots 3 that are spaced apart from each other in the circumferential direction C. In other words, the pair of conductor side portions 22 included in each segment conductor 21 is disposed in a pair of slots 3 that are separated from each other in the circumferential direction C by a distance corresponding to one magnetic pole pitch (electrical angle π).

  Furthermore, as shown to Fig.2 (a), a pair of conductor side part 22 with which the segment conductor 21 is provided is each arrange | positioned at a pair of slot 3 spaced apart in the circumferential direction C so that it may become a mutually adjacent layer. . More specifically, with respect to the pair of conductor side portions 22 included in the segment conductor 21, the conductor side portion 22 on the one circumferential side C1 is 1 in the radial inner side R1 with respect to the conductor side portion 22 on the other circumferential side C2. It is arranged offset by layer. In this way, by shifting the radial direction R position of the pair of conductor side portions 22 included in the segment conductor 21, it is possible to regularly arrange the unique crossing portion 27 on the other axial side L <b> 2 with respect to the stator core 2. ing. In FIG. 1, the shape of the coil end portion on the other axial side L2 with respect to the stator core 2 (arrangement configuration of the unique crossing portion 27) is omitted, but any shape of the coil end portion is adopted. can do.

  A plurality (four in this example) of segment conductors 21 constituting the same turn are dispersedly arranged along the circumferential direction. In this example, the four segment conductors 21 constituting the same turn are arranged at intervals of the circumferential direction C corresponding to two magnetic pole pitches (twice the magnetic pole pitch). FIG. 2 shows two of them. Then, as shown in FIG. 2, the end portions of the joint extension portions 23 of the segment conductors 21 adjacent to each other are sequentially joined so as to make a round in the circumferential direction C, thereby making one turn (one round) of wave winding. The coil part is formed in a cylindrical shape as a whole.

  Although omitted in FIG. 2, as is clear from FIG. 1, each of the wave winding coil portions shown in FIG. 2 is m times the arrangement pitch of the slots 3 on either side in the circumferential direction C (m = 1). , 2,..., 11), and the stator core 2 is also provided with a wave winding coil portion that is shifted by one minute. Then, a set of wave winding coil portions disposed in a common slot 3 and shifted in the circumferential direction C by a distance corresponding to one magnetic pole pitch, and the set of wave winding coil portions are shifted by one slot in the circumferential direction C. A coil for one phase is formed by the set of wave winding coil portions arranged. That is, in this embodiment, the coil 20 is wound around the stator core 2 by distributed winding. In addition, the wave winding coil parts which comprise the coil of an in-phase are connected in series or in parallel.

  In the present embodiment, the two adjacent layers (for example, the first layer and the second layer) and the segment conductors 21 arranged in the two adjacent slots 3 so that the two adjacent slots 3 are in the same phase. Thus, a 4-turn (four rounds) wave-winding coil portion is formed, and a three-phase wave-winding coil portion is formed. As described above, FIG. 1 shows the coil 20 only for the four layers (the first layer to the fourth layer) on the radially outer side R2. Therefore, FIG. 1 shows a wave winding coil portion of 8 turns for each phase, and a wave winding coil portion of 24 turns for the three phases. Although illustration is omitted, the remaining layers have basically the same shape, although the shape viewed from one axial direction side L1 is reduced in diameter as a whole in accordance with the radial direction R position. A layer of coil 20 is inserted, and a total of 20 turns (20 rounds) of wave winding coil portions can be formed for each phase.

  As shown in FIGS. 1 and 2, the distal end portion of the joint extension 23 on the one circumferential side C1 of the segment conductor 21 located on the other circumferential side C2 and the segment conductor located on the circumferential one side C1. By joining the distal end portion of the joining extension portion 23 on the other circumferential side C2 of 21, an inter-segment joining portion 30 formed by joining the two leading end portions is formed. The inter-segment joint 30 is disposed on the outside in the axial direction L with respect to the stator core 2 (in this example, on the outer side of the one side L1 in the axial direction). In other words, the coil 20 includes a pair of joint extension portions 23 (one-side joint described later) extending from the conductor side portions 22 disposed in different slots 3 so as to be different (adjacent in this example) layers. The inter-segment joint 30 formed by joining the extension 23 a and the other side joint extension 23 b) is provided on the outer side in the axial direction L with respect to the stator core 2. The plurality of inter-segment joints 30 are all formed at the same axial position L. Moreover, joining of the front-end | tip parts of the joint extension part 23 is performed by arc welding, such as TIG welding, electron beam welding, laser beam welding, resistance welding, brazing, soldering, etc., for example.

  In the following description, with respect to the pair of joint extension portions 23 joined by the inter-segment joint portion 30, the extension conductor side portions 22 are paired with each other. The one located on the one side C1 in the circumferential direction with respect to 22 is called a one-side joint extension 23a, and the conductor sides 22 of the extension from which the conductor sides 22 of the extension are paired with each other What is located on the other side C2 in the circumferential direction with respect to the portion 22 is referred to as the other-side joint extension portion 23b. That is, the conductor side portion 22 that is the extension source of the one-side junction extension portion 23a is positioned on the one side C1 in the circumferential direction with respect to the conductor side portion 22 that is the extension source of the other-side junction extension portion 23b. In the following description, it is not necessary to distinguish between the one-side bonded extension portion 23a and the other-side bonded extension portion 23b, and any one of the one-side bonded extension portion 23a and the other-side bonded extension portion 23b. When it is clear whether the portion is a joint extension portion, it is simply referred to as a joint extension portion 23.

  As is apparent from FIG. 2A, the conductor side portions 22 of the pair of joining extension portions 23 to be joined are separated from each other in the circumferential direction C by a distance corresponding to one magnetic pole pitch. Each of the two slots 3 is arranged in a layer adjacent to each other. Specifically, the conductor side portion 22 from which the one-side joint extension portion 23a extends is one layer on the radially outer side R2 with respect to the conductor side portion 22 from which the other-side joint extension portion 23b extends. It is offset and arranged in a layer adjacent to the radially outer side R2.

  In accordance with the positional relationship in the circumferential direction C and the radial direction R between the one side joint extension portion 23a and the other side joint extension portion 23b as described above, the one side joint extension portion 23a is the conductor side of the extension source. A circumferentially extending portion 24 extending from the portion 22 toward the other segment side C2 toward the inter-segment joint portion 30 is provided, and a joint surface 25 facing the radially inner side R1 is provided at the tip portion. The other-side joint extension 23b includes a circumferential extension 24 that extends from the conductor side 22 of the extension source toward the inter-segment joint 30 toward the one-side C1 in the circumferential direction, and at the tip. A joining surface 25 facing the radially outer side R2 is provided.

  As shown in FIG. 4, in the inter-segment joint portion 30, the one-side joint extension portion 23 a and the other-side joint extension portion 23 b are joined with their joint surfaces 25 facing each other in the radial direction R. Has been. FIG. 4 is an enlarged perspective view of the vicinity of the inter-segment joint 30 and is shown in a form in which the circumferential direction C is linear for easy understanding of the invention. In FIG. 4, for the sake of simplicity, the extending direction of the joint extension 23 (circumferential extension 24) on the conductor side 22 side from the second bent part 29 is along the circumferential direction C. As shown in FIG. 1 and FIG. 2B, the actual extending direction is viewed from one side in the radial direction (either one of the radial inner side R1 or the radial outer side R2, the same applies hereinafter). The direction intersects the circumferential direction C.

  As described above, in the present embodiment, both the pair of one-side joint extension 23a and the other-side joint extension 23b joined by the inter-segment joint 30 are segmented from the conductor side portion 22 as the extension source. A circumferentially extending portion 24 extending in the circumferential direction C toward the intermediate joint portion 30 is provided. And as shown in FIG. 2, FIG. 3, as it goes to the inter-segment joint part 30 from the extending conductor side part 22, in other words, toward the one axial side L1, the one-side joint extension part 23a The separation distance along the circumferential direction C with the other side joint extension 23b is shortened, and the one side joint extension 23a and the other side joint extension 23b are in the radial direction in the vicinity of the formation position of the second bent portion 29. Overlapping R. Then, from there to the inter-segment joint 30, both joint extensions are maintained so that the one-side joint extension 23 a and the other-side joint extension 23 b are kept overlapping in the radial direction R. 23 is formed. That is, the overlapping region 40 where the one-side joint extension 23a and the other-side joint extension 23b overlap as viewed from one side in the radial direction is formed with the inter-segment joint 30 as the tip. Here, if the base portion where the polymerization of the one-side joint extension portion 23a and the other-side joint extension portion 23b in the polymerization region 40 starts is the polymerization base portion 43, in this example, the formation position of the polymerization base portion 43 is the second position. The position substantially coincides with the formation position of the bent portion 29.

  As shown in FIG. 1, the stator 1 according to the present embodiment includes a radial arrangement portion 31 in which a plurality of overlapping regions 40 in which the circumferential direction C positions of the overlapping base portion 43 coincide with each other are arranged along the radial direction R. Have more than one. In this example, 48 radial array portions 31 are formed in the same number as the slots 3. Specifically, one radial direction array part 31 is a target of superposition with the slot 3 in which the conductor side part 22 of the extension side of the one-side joint extension part 23a to be superposed is disposed. A plurality of overlapping regions 40 that are common to both the slot 3 in which the conductor side portion 22 of the other side joining extension portion 23b is arranged are arranged in the radial direction R. In this example, as described above, since the coil 20 has a 10-layer winding structure, one radial arrangement portion 31 is constituted by five overlapping regions 40 arranged in the radial direction. As described above, only four layers (first to fourth layers) of coils are shown in FIG. 1, so only two of the five overlapping regions are shown in FIG. .

  As shown in FIG. 2, each of the plurality of overlapping regions 40 constituting one radial direction array portion 31 includes a one-side joint extension portion 23a (more precisely, one-side joint The extension side 23a of the extension part 23a is disposed on the odd-numbered layer, and the other side extension part 23b (more precisely, the other side extension part) to be overlapped. 23b of the original conductor side portion 22b of 23b is arranged in the even-numbered layer, and the one-side junction extension portion 23a (the extension-side conductor side portion 22a of the one-side junction extension portion 23a) It is offset by one layer on the radially outer side R2 with respect to the side joining extension portion 23b (the conductor side portion 22 from which the other side joining extension portion 23b extends), and is arranged in a layer adjacent to the radially outer side R2. ing. In addition, although illustration is abbreviate | omitted, the remaining three superposition | polymerization area | regions 40 which are not shown in figure are formed similarly. As described above, the plurality (five in this example) of the overlapping regions 40 constituting one radial direction array portion 31 are connected to each other on the one-side joint extension portion 23a (one-side joint extension portion) to be overlapped. The positional relationship in the radial direction R between the extension side conductor side portion 22a of 23a and the other side junction extension portion 23b (the extension side conductor side portion 22b of the other side junction extension portion 23b) is the same. Yes.

  By the way, as described above, the segment conductor 21 is configured by a linear conductor coated with an insulating film. In this embodiment, at least a part of the insulating film is missing in the inter-segment joint 30 which is a joint between the segment conductors 21. It should be noted that such a defect occurs in the insulating film because when the segment conductors 21 are joined together by welding or the like, the insulating film at the tip of the joint extension 23 is peeled off beforehand with a chemical or the like. This is because the insulating film is removed by heat during operation. That is, in the inter-segment bonding portion 30, at least a part of the insulating film is missing due to the bonding between the one-side bonding extension portion 23a and the other-side bonding extension portion 23b. In other words, the inter-segment bonding part 30 has a film defect part 44 in which at least a part of the insulating film is lost due to the bonding between the one-side bonding extension part 23a and the other-side bonding extension part 23b.

  3 and 4 schematically show a film defect portion 44 in which at least a part of the insulating film is defective. In these figures, the region indicated by the film defect portion 44 does not accurately represent the region where the insulation film is missing, and at least a part of the insulation film is missing at the inter-segment joint 30. It merely represents the concept of being. Note that the actual range of the film defect portion 44 depends on the method of peeling or removing the insulating film, and the film defect portion 44 is centered on the mutually opposing surfaces (contact surfaces 25) of the pair of joint extension portions 23. There may be a case where the film defect portion 44 exists, and there may be a case where the film defect portion 44 exists in a portion other than the surfaces facing each other.

  As described above, in the inter-segment bonding portion 30, at least a part of the insulating film is missing due to the bonding between the one-side bonding extension portion 23a and the other-side bonding extension portion 23b. As shown in FIG. 1, a large number of inter-segment joints 30 are arranged on one side L <b> 1 in the axial direction with respect to the stator core 2. Therefore, it is difficult to ensure electrical insulation between the inter-segment joints 30 adjacent to each other in the radial direction R simply by joining the one-side joint extension 23a and the other-side joint extension 23b. . This point will be described with reference to FIG.

  FIG. 5 is a diagram illustrating a comparative example corresponding to FIG. 2, and illustrates an arrangement state of the coil 20 when a circumferential-direction bent portion 41 described later is not provided. 5 does not relate to the embodiment of the present invention. In FIG. 5, the same reference numerals as those in FIG. 2 are given, and the description related to FIG. 5 in this paragraph is the same as the configuration according to the present embodiment. This will be described using reference numerals. FIG. 5 shows that a pair of one-side joint extension portions 23a and the other-side joint extension portions 23b joined at the inter-segment joint portions 30 are simply formed by causing the joint surfaces 25 to face each other in the radial direction R. The state where it joins is shown. As is apparent from this figure, the plurality of overlapping regions 40 constituting one radial direction array portion 31 are arranged so that not only the polymerization base portion 43 but also the inter-segment joint portion 30 at the tip portion overlaps in the radial direction R. Therefore, it can be seen that the distance between the inter-segment joints 30 is very small. Therefore, with such a configuration, it is not easy to ensure electrical insulation between the adjacent inter-segment joints 30.

  On the other hand, in the present invention, in order to appropriately ensure the electrical insulation between the inter-segment joints 30 even under the above-described conditions, the overlapping region 40 having the inter-segment joints 30 at the tip is as follows. The structure provided with the circumferential direction bending part 41 as described in this is employ | adopted. Hereinafter, the configuration of the circumferentially bent portion 41 will be described.

  As shown in FIGS. 3 and 4, the circumferential bent portion 41 formed in the overlapping region 40 is positioned in the circumferential direction C of the inter-segment joint 30 at the tip of the overlapping region 40. It is a bent part for shifting to either one side in the circumferential direction C with respect to the C position. In other words, the overlapping region 40 has a circumferentially bent portion 41 that bends to one side in the circumferential direction C as it goes from the overlapping base portion 43 to the inter-segment joint portion 30. And the circumferential direction bending part 41 is a direction parallel to the axial direction L when the superposition | polymerization area | region 40 which goes to the junction part 30 between the circumferential direction bending part 41 from the said circumferential direction bending part 41 is seen from the radial direction one side. It forms so that it may become the linear form inclined with respect to. In other words, the extending direction of the overlapping region 40 from the circumferential bent portion 41 to the inter-segment joint 30 is a direction intersecting with a direction parallel to the axial direction when viewed from one side in the radial direction, More specifically, it is a straight line inclined with respect to a direction parallel to the axial direction.

  A plurality (five in this example) of overlapping regions 40 constituting one radially arranged portion 31 are different from each other in the inter-segment joints 30 at the distal ends of the overlapping regions 40 adjacent to each other in the radial direction R. It is formed so as to be positioned in the circumferential direction C position. In this embodiment, in this embodiment, a plurality of overlapping regions 40 constituting one radial array portion 31 are arranged such that the bending directions of the circumferential bending portions 41 included in the overlapping regions 40 adjacent to each other in the radial direction R are mutually different. It is realized by forming it in different directions. As a result, as shown in FIG. 2, the inter-segment joint 30 of one overlapping region 40 adjacent to each other in the radial direction R and the inter-segment joint 30 of the other overlapping region 40 are separated from each other in the circumferential direction C. Will be placed.

  Here, as shown to Fig.2 (a), it comprised along the circumferential direction C of the intersegment joining part 30 which each of the superposition | polymerization area | region 40 which comprises the one radial direction arrangement | sequence part 31 and adjoins to the radial direction R comprised. Assuming that the separation distance is the circumferential separation distance d, the circumferential separation distance d is predetermined between the film defects 44 at the respective leading ends (intersegment joints 30) of the overlapping regions 40 adjacent to each other in the radial direction R. It is preferable to set it so that it is more than the insulation distance. This predetermined insulation distance can be set, for example, from the viewpoint of preventing a short circuit or discharge between adjacent inter-segment joints 30.

  Further, in the present embodiment, as shown in FIG. 1, the overlapping regions 40 in which the radial direction R positions in the different radial direction arranging portions 31 coincide with each other in the circumferential direction C of the inter-segment joint 30 of the overlapping region 40. The positional relationship is the same. Here, “the positional relationship in the circumferential direction C of the inter-segment joint 30 in the superposition region 40” means the superposition base 43 of the superposition region 40 of the inter-segment joint 30 including (belonging to) the inter-segment joint 30. Is a positional relationship in the circumferential direction C (direction and distance in the circumferential direction C). Therefore, in the present embodiment, the plurality of overlapping regions 40 having the same radial direction R position in the different radial direction array portions 31 have the bending direction and the bending angle of the circumferential bending portion 41 formed in each overlapping region 40. It is comprised so that it may become the same mutually. By adopting such a configuration, it is possible to appropriately secure the distance between the inter-segment joints 30 even between the different radial array portions 31.

  As described above, according to the present invention, the distance between the inter-segment joints 30 is appropriately ensured by shifting the inter-segment joints 30 in the circumferential direction between the overlapping regions 40 adjacent in the radial direction R. It is possible. Thereby, while being able to ensure the electrical insulation between the junction parts 30 between segments, the electrical insulation can also be improved also as the coil 20 whole.

  The processing of the circumferential bent portion 41 may be performed before the inter-segment joint 30 is formed or may be performed after the inter-segment joint 30 is formed. Here, as described above, the case where the circumferential bent portion 41 is formed close to the second bent portion 29 is shown as an example, but the formation position of the circumferential bent portion 41 can be changed as appropriate. is there. For example, the formation position of the circumferential bending portion 41 is set to the same position as the formation position of the second bending portion 29, or a portion extending along the axial direction L between the circumferential bending portion 41 and the second bending portion 29 is provided. It can be set to a position where a predetermined length or more can be obtained.

  Further, in order to ensure the electrical insulation between the adjacent inter-segment joints 30, an insulating member is disposed between the adjacent inter-segment joints 30, It is conceivable to cover the surface with an insulating material (resin or the like). In this regard, according to the present invention, since the distance between the adjacent inter-segment joints 30 can be appropriately ensured, the thickness of the insulating member is increased, and defects (voids, pinholes, etc.) are generated. It is possible to form an insulating material so as to cover the surface of the inter-segment joint portion 30 in a suppressed form, and this configuration is also suitable when such measures are taken. In addition, when the voltage which acts on the coil 20 of the stator 1 is comparatively small, since sufficient insulation is ensured only by ensuring the distance between the junction parts 30 between segments, an insulating member or an insulating material is abolished. You can also

3. Other Embodiments Finally, other embodiments according to the present invention will be described. Note that the features disclosed in each of the following embodiments can be used only in that embodiment, and can be applied to other embodiments as long as no contradiction arises.

(1) In the above embodiment, the overlapping region 40 from the circumferential bent portion 41 toward the inter-segment joint portion 30 is linearly inclined with respect to a direction parallel to the axial direction L when viewed from one radial direction side. The case where it is formed as described above has been described as an example. However, the embodiment of the present invention is not limited to this, and may be configured as follows, for example. That is, as shown in FIGS. 6 to 8, the circumferential bent portion 41 is the first circumferential bent portion 41, and the overlapping region 40 is between the first circumferential bent portion 41 and the inter-segment joint 30. In the circumferential direction C, the first circumferential direction bent portion 41 is provided with a second circumferential direction bent portion 42 bent to the opposite side to the bent direction, and the overlapping region 40 from the second circumferential direction bent portion 42 to the inter-segment joint 30. The extending direction of each of the superposition regions 40 is formed so that the overlapping regions 40 adjacent to each other in the radial direction R are parallel to each other when viewed from one side in the radial direction. 6, 7, and 8 are drawings corresponding to FIGS. 1, 3, and 4 according to the above embodiment, respectively. With such a configuration, it is possible to ensure the distance between the inter-segment joint portions 30 adjacent not only in the circumferential direction C but also in the radial direction R between the different radial array portions 31, The electrical insulation between the portions 30 can be more reliably ensured. 6 to 8, as an example, the extending direction of the overlapping region 40 from the second circumferential bent portion 42 to the inter-segment joint 30 is parallel to the axial direction L when viewed from one side in the radial direction. The structure which becomes a direction is shown. That is, in the example shown in FIGS. 6 to 8, the extending direction of the overlapping region 40 from the first circumferential bent portion 41 to the second circumferential bent portion 42 is in the axial direction L when viewed from one radial side. Although the direction is inclined (crossed) with respect to the parallel direction, the extending direction of the overlapping region 40 from the second circumferential bent portion 42 to the inter-segment joint 30 is viewed from one side in the radial direction. The direction is parallel to the axial direction L.

(2) In the above-described embodiment, both the pair of one-side joint extension 23a and the other-side joint extension 23b joined at the inter-segment joint 30 are connected to the inter-segment joint from the conductor side 22 of the extension source. The case where the circumferentially extending portion 24 extending in the circumferential direction C toward 30 is provided as an example. However, the embodiment of the present invention is not limited to this, and only one of the pair of one-side joint extension 23a and the other-side joint extension 23b joined by the inter-segment joint 30 is circumferential. It can also be set as the structure provided with the extension part 24. FIG. In such a configuration, the joint extension portion 23 that does not include the circumferential extension portion 24 does not include the first bent portion 28 and the second bent portion 29, and the boundary portion between the conductor side portion 22 and the polymerization base portion. The shape between the boundary part 43 and 43 is a straight line extending along the axial direction L when viewed from one side in the radial direction.

(3) In the above-described embodiment, the plurality of overlapping regions 40 constituting one radially arranged portion 31 have different bending directions of the circumferential bending portions 41 included in the overlapping regions 40 adjacent to each other in the radial direction R. The case where it is formed so as to be described as an example. However, the embodiment of the present invention is not limited to this, and at least a part of the plurality of overlapping regions 40 constituting one radially arranged portion 31 includes the overlapping regions 40 adjacent to each other in the radial direction R. It can also be set as the structure currently formed so that the bending direction of the circumferential direction bending part 41 may become the mutually same direction. Even in such a configuration, the inter-segment joints 30 at the distal ends of the overlapping regions 40 can be made different by making the bending angles of the circumferential bending portions 41 included in the overlapping regions 40 adjacent to each other in the radial direction R different from each other. Can be positioned at different circumferential positions. Further, in such a case, the configuration in which the bending angle of one circumferential bending portion 41 is zero, that is, one of the two overlapping regions 40 adjacent to each other in the radial direction R includes the circumferential bending portion 41. It can also be set as the structure without.

(4) In said embodiment, the superposition | polymerization area | regions 40 where the radial direction R position in the mutually different radial direction arrangement | positioning part 31 corresponds are the same in the positional relationship of the circumferential direction C of the junction part 30 between the segments of the said superposition | polymerization area | region 40. The case where it is configured as described above has been described as an example. However, the embodiment of the present invention is not limited to this, and the overlapping regions 40 in which the radial direction R positions in the different radial direction arranged portions 31 coincide with each other are the circumferences of the inter-segment joining portions 30 of the overlapping regions 40. The positional relationship in the direction C may be different. That is, the plurality of overlapping regions 40 having the same radial direction R position in different radial direction array portions 31 are configured such that the bending direction and the bending angle of the circumferential bending portion 41 formed in each overlapping region 40 are different from each other. can do.

(5) In the above embodiment, at the inter-segment joint 30, at least a part of the insulating film covering the linear conductor is lost for joining the one-side joint extension 23 a and the other-side joint extension 23 b. However, the embodiment of the present invention is not limited to this. For example, the insulating film covering the linear conductor is not peeled off or removed at the inter-segment bonding portion 30, and the end surfaces (surfaces orthogonal to the extending direction) of the linear conductor are bonded to each other via a conductive material. It can also be set as the structure.

(6) In the above embodiment, the case where the pair of conductor side portions 22 included in the conductor segment 21 are arranged in layers adjacent to each other in the slots 3 having different circumferential C positions has been described as an example. However, the embodiment of the present invention is not limited to this, and the coil 20 is a conductor segment 21 in which each of the pair of conductor side portions 22 is arranged in the same layer in the slot 3 having a different circumferential position C position. Alternatively, it may be configured to have a conductor segment 21 in which each of the pair of conductor side portions 22 is arranged in two or more different layers in the slot 3 having different circumferential positions C. Even in such a configuration, the pair of joint extension portions 23 connected at the inter-segment joint portion 30 are arranged so as to be adjacent to each other in the slots 3 having different circumferential C positions. If it is set as the joint extension part 23 each extended from 1 side joint extension part 23a and the other side joint extension part 23b similarly to the said embodiment, each joint surface 25 mutually is radial direction R mutually. It can be set as the structure joined facing.

(7) In the above-described embodiment, the plurality of overlapping regions 40 constituting one radial direction array portion 31 are formed of the one-side joint extension portion 23a and the other-side joint extension portion 23b that are to be overlapped with each other. The case where the positional relationship in the radial direction R is the same has been described as an example. However, the embodiment of the present invention is not limited to this, and the one-side joint extension portion 23a that is an object of superposition of at least a part of the plurality of overlapping regions 40 constituting one radial direction array portion 31. And the other-side joint extension portion 23b, the one-side joint extension portion 23a and the other-side joint to be overlapped with each other in the overlapping region 40 constituting the same radial direction arrangement portion 31. It is also possible to adopt a configuration different from the positional relationship in the radial direction R with the extending portion 23b.

(8) In the above-described embodiment, the radial array portion 31 includes the slot 3 in which the conductor side portion 22 that is the extension source of the one-side joint extension portion 23a to be overlapped is disposed, and the overlap target. A plurality of overlapping regions 40 that are common to both the slot 3 in which the conductor side portion 22 of the extension side of the other side joint extension portion 23b is arranged are arranged in the radial direction. The case has been described as an example. However, the embodiment of the present invention is not limited to this. That is, a slot in which at least a part of the plurality of overlapping regions 40 constituting one radial array portion 31 is disposed with the conductor side portion 22 that is the extension source of the one-side joint extension portion 23a to be overlapped. 3 and at least one of the slot 3 in which the conductor side portion 22 that is the extension source of the other-side joint extension portion 23b to be overlapped constitutes the same radial direction arrangement portion 31 It is also possible to adopt a configuration that is not common with the corresponding slot 3 in the overlapping region 40.

(9) In the above embodiment, the case where the coil 20 is wound around the stator core 2 by wave winding has been described as an example. However, the coil 20 is wound around the stator core 2 by lap winding or concentric winding. It is good also as a structure, and it is good also as a structure which has both the wave winding part by which the coil 20 is wound by a wave winding, and the non-wave winding part wound by a lap | wrapping or a concentric winding. In the above embodiment, the case where the coil 20 is wound around the stator core 2 by distributed winding has been described as an example. However, the coil 20 is wound around the stator core 2 by concentrated winding. You can also.

(10) In the above-described embodiment, the segment conductor 21 includes the pair of conductor side portions 22, the unique crossing portion 27 that connects one ends of the pair of conductor side portions 22, and the pair of conductor side portions 22. The case where it has a pair of joint extension part 23 extended from the other end of this was demonstrated as an example. However, the embodiment of the present invention is not limited to this, and at least a part of the segment conductor 21 constituting the coil 20 includes a conductor side portion 22 disposed in the slot 3 along the axial direction L; A segment conductor having a pair of joint extending portions 23 extending in the axial direction L with respect to the stator core 2 from both ends of the conductor side portion 22, that is, having a unique crossing portion 27. A preferred embodiment of the present invention is a configuration in which there is no segment conductor (for example, an I-shaped segment conductor or an L-shaped segment conductor in which one joint extension 23 is bent in advance). one of.

(11) In the above-described embodiment, the case where the cross-sectional shape of the linear conductor constituting the segment conductor 21 in the cross section perpendicular to the extending direction is rectangular has been described as an example. However, the embodiment of the present invention is not limited to this, and linear conductors such as a circular shape, an elliptical shape, a square shape, and a polygonal shape can be used as the cross-sectional shape.

(12) In the above embodiment, the case where the armature for a rotating electrical machine according to the present invention is applied to a stator for an inner rotor type rotating electrical machine has been described as an example. It can also be applied.

  The present invention relates to an armature core comprising a plurality of slots extending in the axial direction of a cylindrical core reference plane dispersed in the circumferential direction of the core reference plane and a plurality of segment conductors joined together. It can utilize suitably for the armature for rotary electric machines provided with the coil wound by.

1: Stator (armature for rotating electrical machine)
2: Stator core (armature core)
3: Slot 20: Coil 21: Segment conductor 22: Conductor side 23: Joining extension 23a: One side joining extension 23b: Other side joining extension 24: Circumferential extension 30: Intersegment joining 31: Radial direction arrangement | positioning part 40: Overlapping area | region 41: Circumferential direction bending part (1st circumferential direction bending part)
42: second circumferential direction bent portion 43: polymerization base portion L: axial direction C: circumferential direction R: radial direction

Claims (6)

An armature core in which a plurality of slots extending in the axial direction of a cylindrical core reference surface are distributed in the circumferential direction of the core reference surface and a plurality of segment conductors are joined and wound around the armature core. An armature for a rotating electric machine comprising:
The segment conductor includes a conductor side portion disposed in the slot along the axial direction, and a joint extension portion extending in the axial direction from at least one end of the conductor side portion with respect to the armature core. And having
The coil is formed by joining tip portions of one side joint extension portion and the other side joint extension portion, which are the joint extension portions extending from the conductor side portions respectively disposed in the different slots. Having an inter-segment joint on the outside in the axial direction with respect to the armature core,
At least one of the pair of the one-side joint extension part and the other-side joint extension part joined at the inter-segment joint part is directed from the extension side conductor side part toward the inter-segment joint part. A superposed region including a circumferentially extending portion extending in the circumferential direction, and a superposition region where the one-side joint extension portion and the other-side joint extension portion overlap when viewed from one side in the radial direction is the tip portion of the inter-segment joint portion. Is formed as
A plurality of the polymerization regions in which the circumferential positions of the polymerization bases that are the bases where the polymerization of the one-side bonding extension part and the other-side bonding extension part in the polymerization region coincides are arranged along the radial direction. A plurality of radially arranged portions,
A plurality of the overlapping regions constituting one radial array portion are formed such that the inter-segment joints at the distal ends of the overlapping regions adjacent to each other in the radial direction are positioned at different circumferential positions. Armature for rotating electrical machines. The polymerization region has a circumferential bent portion that bends to any one side in the circumferential direction from the polymerization base toward the inter-segment joint.
The plurality of overlapping regions constituting one radial array portion are formed such that bending directions of the circumferential bending portions provided in the overlapping regions adjacent to each other in the radial direction are different from each other. The armature for rotary electric machines according to 1.   3. The overlapping region from the circumferential bent portion toward the inter-segment joint is formed so as to be a straight line inclined with respect to a direction parallel to the axial direction when viewed from one radial direction side. The armature for rotary electric machines described in 1. The circumferential bent portion is a first circumferential bent portion,
The overlapping region includes a second circumferential bent portion that bends in a direction opposite to the bending direction of the first circumferential bent portion in the circumferential direction between the first circumferential bent portion and the inter-segment joint. Prepared,
The extending direction of the overlapping region from the second circumferentially bent portion to the inter-segment bonding portion is parallel to each other in the overlapping regions adjacent to each other in the radial direction when viewed from one side in the radial direction. The armature for a rotating electrical machine according to claim 2, wherein the armature is formed. The segment conductor is composed of a linear conductor coated with an insulating film,
5. The at least one part of the insulating film is missing in the inter-segment bonding portion due to the bonding between the one-side bonding extension portion and the other-side bonding extension portion. The armature for rotary electric machines described in 1.   6. The superposition region in which the radial positions in the different radial array portions are different from each other, and the positional relationship in the circumferential direction of the inter-segment joint portion of the superposition region is the same. The armature for rotary electric machines as described.

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