Patent Publication Number: US-2021167649-A1

Title: Armature

Description:
TECHNICAL FIELD 
     The preferred embodiment relates to an armature. 
     BACKGROUND ART 
     Conventionally, there is known an armature including an armature core provided with a plurality of slots extending in a central axis line direction. Such an armature is disclosed in, for example, JP 2006-141076 A. 
     JP 2006-141076 A discloses a rotating electrical machine stator (hereinafter, referred to as “stator”) including a stator core provided with a plurality of slots extending in a central axis line direction (axial direction). In the stator, an end part of a linear part (leg part) of a one-side conductor segment disposed on one side in the axial direction of the stator core and an end part of a linear part (leg part) of an other-side conductor segment disposed on the other side in the axial direction of the stator core are joined together in a slot. Specifically, an insulating insulator is disposed in the slot. The linear part of the one-side conductor segment and the linear part of the other-side conductor segment are inserted inside the insulating insulator disposed in the slot and are joined together. Specifically, a facing surface which is a plane axially perpendicular to the linear part of the one-side conductor segment and a facing surface which is a plane axially perpendicular to the linear part of the other-side conductor segment are joined together. 
     In addition, in JP 2006-141076 A, the end part (facing surface) of the linear part of the one-side conductor segment and the end part (facing surface) of the linear part of the other-side conductor segment both have chamfered parts formed thereat. The chamfered parts are provided so as to intersect a circumferential direction when the linear part of the one-side conductor segment (the linear part of the other-side conductor segment) is viewed in a radial direction. That is, the chamfered parts are formed so as to extend in the radial direction when the linear part is viewed in the radial direction. In addition, the chamfered parts are provided on both circumferential sides of the end part of the linear part. By this, the end part of the linear part has an end-thinning shape as viewed in the radial direction. As a result, the linear part of the one-side conductor segment (the linear part of the other-side conductor segment) can be easily inserted inside the insulating insulator. In addition, in the slot (the inside of the insulating insulator), the chamfered facing surface of the linear part of the one-side conductor segment and the chamfered facing surface of the linear part of the other-side conductor segment are joined together with a conductive joint material, with the chamfered facing surfaces facing each other. 
     CITATIONS LIST 
     Patent Literature 
     Patent Literature 1: JP 2006-141076 A 
     SUMMARY 
     Technical Problems 
     However, in JP 2006-141076 A, since the facing surface of the linear part of the one-side conductor segment and the facing surface of the linear part of the other-side conductor segment are both chamfered, the areas of the facing surfaces are relatively small. Hence, there is a possible problem of a shortage of a joint area available for joining together the linear part of the one-side conductor segment and the linear part of the other-side conductor segment. 
     Disclosed embodiments are directed to solve a problem such as that described above, and provides an armature capable of preventing a shortage of a joint area. 
     Solutions to Problems 
     To provide the above-described armature, an armature according to a preferred embodiment includes: an armature core provided with a plurality of slots extending in a central axis line direction; and a coil part having a plurality of segment conductors whose facing surfaces are joined together, the plurality of segment conductors being disposed so as to face the central axis line direction, and the plurality of segment conductors include a first segment conductor disposed on one side in the central axis line direction of the armature core; and a second segment conductor disposed on an other side in the central axis line direction of the armature core, the facing surfaces provided at an end part of the first segment conductor and an end part of the second segment conductor are disposed so as to overlap each other as viewed in a radial direction, the facing surfaces being portions where the first segment conductor and the second segment conductor are joined together, and the end part of at least one of the first segment conductor and the second segment conductor is provided with chamfered parts at edge parts on both circumferential sides of the end part. 
     In the armature according to the one aspect of the preferred embodiment, as described above, facing surfaces which are portions where a first segment conductor and a second segment conductor are joined together and which are provided at an end part of the first segment conductor and an end part of the second segment conductor are disposed so as to overlap each other as viewed in the radial direction, and the end part of at least one of the first segment conductor and the second segment conductor is provided with chamfered parts at edge parts on both circumferential sides thereof. By this, since the facing surface of the first segment conductor and the facing surface of the second segment conductor are provided so as to overlap each other as viewed in the radial direction, even when chamfered parts are provided at the end part of at least one of the first segment conductor and the second segment conductor, the amount of reduction in the area of the facing surface can be reduced. As a result, a shortage of a joint area can be prevented. 
     Advantages 
     According to the preferred embodiment, as described above, a shortage of a joint area can be prevented. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a plan view showing a configuration of a stator (rotating electrical machine) according to one embodiment. 
         FIG. 2  is a perspective view showing a configuration of the stator according to one embodiment. 
         FIG. 3  is an exploded perspective view of the stator according to one embodiment. 
         FIG. 4  is a plan view showing a configuration of a stator core according to one embodiment. 
         FIG. 5  is a cross-sectional view showing a configuration of insulating members according to one embodiment. 
         FIG. 6  is a circuit diagram showing a connection configuration of a coil part according to one embodiment. 
         FIG. 7  is a perspective view showing a part of a first coil assembly according to one embodiment. 
         FIG. 8  is a transverse cross-sectional view showing a configuration of a segment conductor according to one embodiment, and  FIG. 8A  is a diagram showing an insulating film and  FIG. 8B  is a diagram showing an insulating member. 
         FIG. 9  is a diagram ( 1 ) showing a configuration of general conductors according to one embodiment, and  FIG. 9A  is a front view and  FIG. 9B  is a side view. 
         FIG. 10  is a diagram ( 1 ) of chamfered parts as viewed in a circumferential direction according to one embodiment. 
         FIG. 11  is a diagram showing a configuration of a first facing surface of a first segment conductor according to one embodiment. 
         FIG. 12  is a diagram showing a configuration of a second facing surface of a second segment conductor according to one embodiment. 
         FIG. 13  is a diagram ( 2 ) of chamfered parts as viewed in the circumferential direction according to one embodiment. 
         FIG. 14  is a diagram (side view) showing a manufacturing device according to one embodiment. 
         FIG. 15  is a diagram ( 2 ) showing a configuration of general conductors according to one embodiment. 
         FIG. 16  is a diagram of chamfered parts as viewed in a radial direction according to one embodiment. 
         FIG. 17  is a diagram (top view) showing the manufacturing device according to one embodiment. 
         FIG. 18  is a flowchart showing steps of manufacturing the stator according to one embodiment. 
         FIG. 19  is a cross-sectional view for describing a step of disposing insulating members in slots according to one embodiment. 
         FIG. 20  is a diagram showing a state in which a segment conductor is inserted into a slot having an insulating member disposed therein, according to one embodiment. 
         FIG. 21  is a diagram showing chamfered parts according to a first variant. 
         FIG. 22  is a diagram (diagram as viewed in the radial direction) showing chamfered parts according to a second variant. 
         FIG. 23  is a diagram (diagram as viewed in the circumferential direction) showing the chamfered parts according to the second variant. 
         FIG. 24  is a diagram of first segment conductors and second segment conductors which are joined together as viewed in the circumferential direction, according to a third variant. 
         FIG. 25  is a partial enlarged view of  FIG. 24 . 
         FIG. 26  is a diagram of a first segment conductor as viewed in the radial direction according to the third variant. 
         FIG. 27  is a diagram of a second segment conductor as viewed in the radial direction according to the third variant. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The present embodiment of the preferred embodiment will be described below based on the drawings. 
     Present Embodiment 
     (Structure of a Stator) 
     With reference to  FIGS. 1 to 16 , a structure of a stator  100  according to the present embodiment will be described. The stator  100  has an annular shape having a central axis line C 1  at the center thereof. Note that the stator  100  is an example of an “armature” in the claims. 
     In the specification of this application, an “axial direction (central axis line direction)” indicates, as shown in  FIG. 1 , a direction (Z-direction) along the central axis line C 1  of the stator  100  (a rotation axis line of a rotor  101 ). In addition, a “circumferential direction” indicates a circumferential direction (an A 1 -direction and an A 2 -direction) of the stator  100 . In addition, a “radial direction” indicates a radial direction (R-direction) of the stator  100 . In addition, a “radial inner side” indicates a direction (R 1 -direction) going toward the central axis line C 1  of the stator  100  in the radial direction. In addition, a “radial outer side” indicates a direction (R 2 -direction) going toward the outside of the stator  100  in the radial direction. 
     The stator  100  together with the rotor  101  forms a part of a rotating electrical machine  102 . The rotating electrical machine  102  is constructed as, for example, a motor, a generator, or a motor-generator. As shown in  FIG. 1 , the stator  100  is disposed on the radial outer side of the rotor  101  having permanent magnets (not shown) provided thereon. Namely, in the present embodiment, the stator  100  forms a part of the inner-rotor rotating electrical machine  102 . 
     As shown in  FIG. 2 , the stator  100  includes a stator core  10 , insulating members  20 , and a coil part  30 . In addition, as shown in  FIG. 3 , the coil part  30  includes a first coil assembly  30   a  and a second coil assembly  30   b.  In addition, the coil part  30  includes a plurality of segment conductors  40 . Note that the stator core  10  is an example of an “armature core” in the claims. 
     (Structure of the Stator Core) 
     The stator core  10  has a cylindrical shape having the central axis line C 1  (see  FIG. 1 ) as its central axis. In addition, the stator core  10  is constructed by, for example, stacking a plurality of electromagnetic steel sheets (e.g., silicon steel sheets) in the axial direction. As shown in  FIG. 4 , the stator core  10  is provided with a back yoke  11  having an annular shape as viewed in the axial direction; and a plurality of slots  12  provided on the radial inner side of the back yoke  11  and extending in the axial direction. The stator core  10  is provided with a plurality of teeth  13  on both circumferential sides of the slots  12 . 
     Each slot  12  is a portion surrounded by a wall part  11   a  of the back yoke  11  that is provided more on the radial outer side than a first other end surface  73  which will be described later, and circumferential side surfaces  13   a  of two teeth  13 . The slot  12  is provided with an opening part  12   a  that opens on the radial inner side. In addition, the slot  12  opens on both axial sides. Each tooth  13  is formed so as to protrude from the back yoke  11  toward the radial inner side, and has projecting parts  13   b  formed at an end part on the radial inner side thereof, the projecting parts  13   b  forming opening parts  12   a  of slots  12 . 
     Each opening part  12   a  has an opening width W 1  in the circumferential direction. Here, the opening width W 1  corresponds to a distance between end parts of projecting parts  13   b  of teeth  13 . In addition, a width W 2  of a portion of a slot  12  where the coil part  30  and an insulating member  20  are disposed is larger than the opening width W 1 . Namely, the slot  12  is constructed as a semi-open slot. Here, the width W 2  corresponds to a distance between circumferential side surfaces  13   a  of teeth  13  disposed on both circumferential sides of the slot  12 . In addition, the width W 2  of the slot  12  is substantially constant in the radial direction. 
     (Structure of the Insulating Members) 
     As shown in  FIG. 5 , each insulating member  20  is disposed between teeth  13  and segment conductors  40 . The insulating member  20  includes a joint-portion covering part  21 . The joint-portion covering part  21  is configured to cover at least the radial inner side of a joint portion  90  (described later) of one of a plurality of parallelly and radially arranged segment conductors  40  that is arranged on a side closest to an opening part  12   a  of a slot  12 . 
     Specifically, the insulating members  20  are made of, for example, sheet-like insulating members such as aramid paper and polymer films, and have a function of ensuring insulation between the segment conductors  40  (the coil part  30 ) and the stator core  10 . Each insulating member  20  is disposed between segment conductors  40  and circumferential side surfaces  13   a  of teeth  13  and between one of the plurality of segment conductors  40  that is disposed on the radially outermost side and a wall part  11   a.  In addition, as shown in  FIG. 3 , each insulating member  20  includes collar parts  22  (cuff parts) formed so as to protrude from a slot  12  toward the axial outer side on both axial sides and to be folded back. 
     Each insulating member  20  is disposed so as to entirely cover the circumference of a plurality of parallelly and radially arranged segment conductors  40  as viewed in an arrow “Z 2 ” direction. In other words, both circumferential sides and both radial sides of leg parts  42   a  and  42   b  (described later) of the plurality of parallelly and radially arranged segment conductors  40  are covered by the insulating member  20 . By this, it becomes possible to ensure insulation between the joint portions  90  and the stator core  10  by the insulating member  20 . 
     (Structure of the Coil Part) 
     As shown in  FIGS. 2 and 3 , the coil part  30  is formed by axially combining and joining together the first coil assembly  30   a  provided on one axial side (an arrow “Z 1 ” direction side) and the second coil assembly  30   b  provided on the other axial side (an arrow “Z 2 ” direction side). The first coil assembly  30   a  and the second coil assembly  30   b  each are formed in annular shape having the same central axis line C 1  as the stator core  10  (see  FIG. 1 ) at the center thereof. 
     The coil part  30  is constructed as, for example, wave-winding coils. In addition, the coil part  30  is constructed as 8-turn coils. Namely, as shown in  FIG. 5 , the coil part  30  is configured such that eight segment conductors  40  are parallelly and radially arranged in each slot  12 . The coil part  30  is configured such that by supplying three-phase alternating-current power to the coil part  30  from a power supply part (not shown), while current moves back and forth in the axial direction and flows in the circumferential direction, a magnetic flux is generated. 
     &lt;Configuration of Connection of the Coil Part&gt; 
     As shown in  FIG. 6 , the coil part  30  is connected using three-phase “Y” connection. Namely, the coil part  30  includes a U-phase coil part  30 U, a V-phase coil part  30 V, and a W-phase coil part  30 W. For example, the coil part  30  is provided with a plurality of neutral points N. Specifically, the coil part  30  is four parallel-connected (star-connected). Namely, the U-phase coil part  30 U is provided with four neutral-point connection end parts NtU and four power-line connection end parts PtU. The V-phase coil part  30 V is provided with four neutral-point connection end parts NtV and four power-line connection end parts PtV. The W-phase coil part  30 W is provided with four neutral-point connection end parts NtW and four power-line connection end parts PtW. Note that in the following description when the neutral-point connection end parts and the power-line connection end parts for the U-phase, the V-phase, and the W-phase are not particularly distinguished from each other, they are simply described as “neutral-point connection end parts Nt” and “power-line connection end parts Pt”. 
     &lt;Structures of the Coil Assemblies&gt; 
     As shown in  FIG. 7 , the first coil assembly  30   a  includes a plurality of (e.g., three) segment conductors for power-line connection  50  (hereinafter, referred to as “power conductors  50 ”) which are segment conductors  40 ; a plurality of (e.g., two) segment conductors for neutral point connection  60  (hereinafter, referred to as “neutral point conductors  60 ”) which are segment conductors  40 ; and a plurality of general conductors  41  which are conductors (general segment conductors  40 ) different than the power conductors  50  and the neutral point conductors  60  among the plurality of segment conductors  40  and which form the coil part  30 . 
     As shown in  FIG. 3 , the second coil assembly  30   b  includes a plurality of general conductors  41 . Preferably, the second coil assembly  30   b  includes only a plurality of general conductors  41 , and all of the power conductors  50  and the neutral point conductors  60  provided in the stator  100  are provided in the first coil assembly  30   a.    
     (Structure of the Segment Conductors) 
     As shown in  FIG. 8( a ) , each segment conductor  40  is constructed as a rectangular conducting wire whose transverse section has a substantially rectangular shape. A conductor surface  40   b  of the segment conductor  40  is provided with an insulating film  40   a  having a thickness t 1 . The thickness t 1  of the insulating film  40   a  is set to such a thickness, for example, that allows to ensure phase-to-phase insulation performance (insulation between coil end parts  43 ). In addition, a conductor main body  40   c  of the segment conductor  40  is made of, for example, a metal material (conductive material) such as copper or aluminum. Note that although  FIG. 8  shows a magnitude relationship between thicknesses, etc., in an exaggerated manner for the sake of description, the configuration is not limited to the example shown in the drawing. 
     As shown in  FIG. 9 , a segment conductor  40  includes leg parts  42   a  and  42   b  which are disposed in slots  12 ; and a coil end part  43 . The leg parts  42   a  and  42   b  indicate portions disposed in slots  12  from an axial location of an end surface  10   a  or  10   b  of the stator core  10 , and the coil end part  43  indicates a portion that is formed so as to continue to the leg parts  42   a  and  42   b  and that is disposed more on the axial outer side than the end surface  10   a  or  10   b  of the stator core  10 . In addition, the coil end part  43  has a bent shape that bends in the axial direction. In addition, the coil end part  43  has a crank portion  43   a  formed in crank shape that radially bends in a stepwise manner for an amount corresponding to the width of a single segment conductor  40  as viewed in the axial direction. That is, the radial width of the crank portion  43   a  is double the width of a single segment conductor  40 . 
     &lt;Structure of the General Conductors&gt; 
     As shown in  FIG. 9 , a general conductor  41  includes a pair of leg parts  42   a  and  42   b  disposed in different slots  12 ; and a coil end part  43  that connects the pair of leg parts  42   a  and  42   b.  By this, the general conductor  41  has a substantially U-shape or a substantially J-shape as viewed from the radial inner side. The leg parts  42   a  and  42   b  are formed linearly in the axial direction. Note that leg parts  42   a  and  42   b  of the power conductors  50  and leg parts  42   a  and  42   b  of the neutral point conductors  60  are configured in the same manner as the leg parts  42   a  and  42   b  of the general conductors  41 , and thus, description thereof is omitted. 
     Here, the coil pitch of the general conductors  41  is six. Namely, a pair of leg parts  42   a  and  42   b  are disposed at different circumferential locations corresponding to six slots  12 . Namely, five slots are provided between a slot  12  in which a leg part  42   a  of a general conductor  41  is disposed and a slot  12  in which a leg part  42   b  is disposed. 
     In addition, the pair of leg parts  42   a  and  42   b  have different axial lengths. Specifically, an axial length L 1  of the leg part  42   a  is larger than an axial length L 2  of the leg part  42   b.  Note that the axial length L 1  (L 2 ) of the leg part  42   a  ( 42   b ) indicates a length from an end  75  ( 85 ) to an axial location corresponding to the end surface  10   a  ( 10   b ) in the axial direction of the stator core  10 . In addition, the axial lengths L 1  and L 2  are smaller than an axial length L 3  of the stator core  10 . Note that the axial length L 3  of the stator core  10  indicates an axial distance (space) between the end surfaces  10   a  and  10   b.  For example, the axial length L 1  is larger than one-half of the axial length L 3 , and the axial length L 2  is smaller than one-half of the axial length L 3 . 
     In addition, the plurality of general conductors  41  include one-side general conductors  41   a  that are disposed on one axial side (the arrow “Z 1 ” direction side) of the stator core  10  and included in the first coil assembly  30   a;  and other-side general conductors  41   b  that are disposed on the other axial side (the arrow “Z 2 ” direction side) of the stator core  10  and included in the second coil assembly  30   b.    
     (Configuration of the Joint Portions) 
     As shown in  FIG. 10 , in a slot  12  of the stator core  10 , a first leg part  71  which is a leg part  42   a  of a first segment conductor  70  which is one of a plurality of segment conductors  40  that is included in the first coil assembly  30   a  and a second leg part  81  which is a leg part  42   b  of a second segment conductor  80  which is a segment conductor  40  included in the second coil assembly  30   b  and axially facing the first segment conductor  70  are joined together at a joint portion  90 . 
     Likewise, as shown in  FIG. 13 , in the slot  12  of the stator core  10 , a first leg part  71  which is a leg part  42   b  of a first segment conductor  70  which is a segment conductor  40  included in the first coil assembly  30   a  and a second leg part  81  which is a leg part  42   a  of a second segment conductor  80  which is a segment conductor  40  included in the second coil assembly  30   b  are joined together at a joint portion  90 . 
     As shown in  FIGS. 10 and 11 , the first leg part  71  includes a first facing surface  72  facing the radial outer side (an arrow “R 2 ” direction side) and facing the second leg part  81 . In addition, the first leg part  71  includes a first one end surface  74  provided on one radial side which is the same side as the first facing surface  72 ; and a first other end surface  73  provided on the other radial side. 
     In addition, as shown in  FIG. 12 , the second leg part  81  includes a second facing surface  82  facing the radial inner side (an arrow “R 1 ” direction side) and facing the first facing surface  72 . In addition, the second leg part  81  includes a second one end surface  84  provided on one radial side which is an opposite side to a second joint surface  82   a;  and a second other end surface  83  provided on the other radial side. Note that the first facing surface  72  and the second facing surface  82  are an example of “facing surfaces” in the claims. 
     The first other end surface  73  of the first segment conductor  70  is disposed so as to be offset (to protrude) more radially (R 1 -direction side) than the second other end surface  83  of the second segment conductor  80 . In addition, the second one end surface  84  of the second segment conductor  80  is disposed so as to be offset (to protrude) more radially (R 2 -direction side) than the first one end surface  74  of the first segment conductor  70 . 
     Here, the joint portion  90  is a portion of the coil part  30  shown in  FIG. 10 , and is a portion including the first facing surface  72  and the second facing surface  82  and including a portion from an end  75  of the first leg part  71  to a boundary point  76  between the first facing surface  72  and the first one end surface  74  and a portion from an end  85  of the second leg part  81  to a boundary point  86  between the second facing surface  82  and the second other end surface  83 . 
     An other step part  111  is formed at a portion between the end  75  of the first leg part  71  and the boundary point  86  of the second leg part  81 , which is a boundary portion between the first other end surface  73  and the second other end surface  83 . In addition, a one step part  112  is formed at a portion between the boundary point  76  of the first leg part  71  and the end  85  of the second leg part  81 , which is a boundary portion between the first one end surface  74  and the second one end surface  84 . Specifically, at the other step part  111 , a step is formed so as to be recessed toward the inner sides of the segment conductors  40  in a direction from the first other end surface  73  to the second other end surface  83 . In addition, at the one step part  112 , a step is formed so as to be recessed toward the inner sides of the segment conductors  40  in a direction from the second one end surface  84  to the first one end surface  74 . 
     In addition, a first displacement width d 1  which is a displacement width between a radial location P 1  of the first other end surface  73  and a radial location P 2  of the second other end surface  83  is, for example, greater than the thickness t 1  of the insulating film  40   a  of the segment conductor  40 . 
     As shown in  FIG. 14 , a plurality of (e.g., eight) first leg parts  71  and a plurality of (e.g., eight) second leg parts  81  are disposed in a slot  12  so as to be radially adjacent to each other. Namely, the plurality of first leg parts  71  are parallelly and radially arranged and the plurality of second leg parts  81  are parallelly and radially arranged. 
     In the slot  12 , one of first facing surfaces  72  of the plurality of first leg parts  71  is disposed at a different axial location than another first facing surface  272  radially adjacent thereto which will be described later. In addition, in the slot  12 , one of second facing surfaces  82  of the plurality of second leg parts  81  is disposed at a different axial location than another second facing surface  282  radially adjacent thereto which will be described later. Namely, an axial location P 11  of a joint portion  90  including a first facing surface  272  and a second facing surface  282  is a different location than an axial location P 12  of a joint portion  90  including another first facing surface  72  and another second facing surface  82  which are radially adjacent to the first facing surface  272  and the second facing surface  282 . Note that the first facing surface  272  and the second facing surface  282  are an example of “facing surfaces” in the claims. 
     In other words, in the axial locations P 11  and P 12 , the first leg parts  71  and the second leg parts  81  are staggered in the radial direction. 
     &lt;Configurations of the First Facing Surface and the Second Facing Surface&gt; 
     As shown in  FIG. 11 , the first facing surface  72  of the first leg part  71  includes a first joint surface  72   a  which is inclined in an arrow “E 11 ” direction; a first reverse inclined surface  72   b  which is inclined in an arrow “E 12 ” direction; and a first separated and facing surface  72   c  which is inclined in an arrow “E 13 ” direction. In addition, as shown in  FIG. 12 , the second facing surface  82  of the second leg part  81  includes a second joint surface  82   a  which is inclined in an arrow “E 21 ” direction; a second reverse inclined surface  82   b  which is inclined in an arrow “E 22 ” direction; and a second separated and facing surface  82   c  which is inclined in an arrow “E 23 ” direction. A specific description will be made below. 
     As shown in  FIG. 10 , the first facing surface  72  of the first leg part  71  and the second facing surface  82  of the second leg part  81  are formed so as to be inclined with respect to the axial direction. Specifically, the first facing surface  72  is constructed as an end surface that is inclined with respect to the axial direction in an arrow “E 1 ” direction from the end  75  of the first leg part  71 . In addition, the first facing surface  72  is not provided with an insulating film  40   a.  The second facing surface  82  is constructed as an end surface that is inclined in an arrow “E 2 ” direction from the end  85  of the second leg part  81 . In addition, the second facing surface  82  is not provided with an insulating film  40   a.  Note that the arrow “E 1 ” direction indicates a direction going from the end  75  toward the boundary point  76  between the first facing surface  72  and the first one end surface  74 . Note also that the arrow “E 2 ” direction indicates a direction going from the end  85  toward the boundary point  86  between the second facing surface  82  and the second other end surface  83 . 
     The first facing surface  72  and the second facing surface  82  each are formed such that its radial cross-section has an S-shape. The first facing surface  72  having an S-shape (uneven shape) and the second facing surface  82  having an S-shape (uneven shape) are disposed in a slot  12 , with the first facing surface  72  and the second facing surface  82  being radially engaged with each other. 
     In addition, a part of the first facing surface  72  and a part of the second facing surface  82  are joined together with a joint material  130 . Specifically, the first facing surface  72  includes the first joint surface  72   a  which is joined to the second facing surface  82 ; and the first reverse inclined surface  72   b  which is formed continuously with the first joint surface  72   a  and which is inclined in an opposite direction (the arrow “E 12 ” direction) to a direction in which the first joint surface  72   a  is inclined (the arrow “E 11 ” direction) with respect to the axial direction (an axis parallel to the central axis line C 1 ). In addition, the first joint surface  72   a  and the first reverse inclined surface  72   b  each are formed as a substantially flat surface, and the first joint surface  72   a  and the first reverse inclined surface  72   b  form a bent shape. In addition, the second facing surface  82  includes the second joint surface  82   a  which is joined to the first joint surface  72   a;  and the second reverse inclined surface  82   b  which is formed continuously with the second joint surface  82   a  and which is inclined in an opposite direction (the arrow “E 22 ” direction) to a direction in which the second joint surface  82   a  is inclined (the arrow “E 21 ” direction) with respect to the axial direction. 
     The joint material  130  is disposed between the first joint surface  72   a  and the second joint surface  82   a,  by which the first joint surface  72   a  and the second joint surface  82   a  are joined together and electrically connected to each other. Specifically, the joint material  130  includes a conductive material such as silver or copper. Preferably, the joint material  130  is a paste-like joint material (silver nanopaste) in which a solvent contains, as conductive particles, metal particles obtained by grinding silver into fine particles of a nanometer level. In addition, the joint material  130  contains a component (resin component) that is volatilized when heated, and has a function of allowing the first joint surface  72   a  and the second joint surface  82   a  to come close to each other by a reduction in the volume of the joint material  130  by heating the component that is volatilized. 
     As shown in  FIG. 10 , the first facing surface  72  includes the first separated and facing surface  72   c  which is formed continuously on an opposite side to the first joint surface  72   a  side of the first reverse inclined surface  72   b  and which is disposed so as to be separated from the second facing surface  82 . In addition, the second facing surface  82  includes the second separated and facing surface  82   c  which is formed continuously on an opposite side to the second joint surface  82   a  side of the second reverse inclined surface  82   b  and which is disposed so as to be separated from the first facing surface  72 . 
     Specifically, the first separated and facing surface  72   c  is inclined in the arrow “E 13 ” direction which is an axially (an axis parallel to the central axis line C 1 ) opposite direction to the first reverse inclined surface  72   b.  In addition, the second separated and facing surface  82   c  is inclined in the arrow “E 23 ” direction which is an axially opposite direction (the axis parallel to the central axis line C 1 ) to the second reverse inclined surface  82   b.  The second separated and facing surface  82   c  is disposed so as to face the first separated and facing surface  72   c,  and clearance CL is made between the first separated and facing surface  72   c  and the second separated and facing surface  82   c.    
     In addition, the end  75  of the first leg part  71  and the end  85  of the second leg part  81  are formed on flat planes orthogonal to each other in the axial direction. 
     Note that although  FIG. 10  shows that the end side of the first leg part  71  has a shape in which the end is thinner than the end side (end-thickening shape) of the second leg part  81 , one side (the leg part  42   a  having the axial length L 1 ) of the first leg part  71  has an end-thinning shape shown in  FIG. 10 , and the other side (the leg part  42   b  having the axial length L 2 ) of the first leg part  71  has an end-thickening shape shown in  FIG. 13 . Likewise, the leg part  42   a  of the second leg part  81  (see  FIG. 13 ) has an end-thinning shape, and the leg part  42   b  of the second leg part  81  (see  FIG. 10 ) has an end-thickening shape. That is, the first segment conductor  70  and the second segment conductor  80  have substantially the same shape. 
     As shown in  FIG. 13 , in a portion where the leg part  42   b  of the first segment conductor  70  and the leg part  42   a  of the second segment conductor  80  are joined together, a first joint surface  272   a  included in a first facing surface  272  of the first segment conductor  70  and a second joint surface  282   a  included in a second facing surface  282  of the second segment conductor  80  are joined together. 
     Here, in the present embodiment, as shown in  FIG. 15 , a first facing surface  72  of a first segment conductor  70  and a second facing surface  82  of a second segment conductor  80  which are provided at an end part  71   a  of the first segment conductor  70  and an end part  81   a  of the second segment conductor  80  are disposed so as to overlap each other as viewed in the radial direction. Specifically, substantially the entire first facing surface  72  and substantially the entire second facing surface  82  overlap each other as viewed in the radial direction. In other words, the first facing surface  72  of the first segment conductor  70  and the second facing surface  82  of the second segment conductor  80  are disposed so as to radially face each other. The end part  71   a  of the first segment conductor  70  (leg part  42   a ) is provided with chamfered parts  77  at edge parts  71   d  on both circumferential sides thereof (as viewed in the radial direction). Likewise, the end part  81   a  of the second segment conductor  80  (leg part  42   b ) is provided with chamfered parts  87  at edge parts  81   d  on both circumferential sides thereof. Likewise, an end part  271   a  of the first segment conductor  70  (leg part  42   b ) is provided with chamfered parts  277  at edge parts  271   d  on both circumferential sides thereof In addition, an end part  281   a  of the second segment conductor  80  (leg part  42   a ) is provided with chamfered parts  287  at edge parts  281   d  on both circumferential sides thereof. 
     (Configuration of the Chamfered Parts) 
     A specific configuration of the chamfered parts  77 , the chamfered parts  277 , the chamfered parts  87 , and the chamfered parts  287  will be described below. Note that the chamfered parts  77 , the chamfered parts  277 , the chamfered parts  87 , and the chamfered parts  287  have the same configuration and thus the chamfered parts  77  will be mainly described. 
     In the present embodiment, as shown in  FIG. 16 , chamfered parts  77  are provided on both circumferential sides of an end part  71   a  of a first segment conductor  70  as viewed in the radial direction. Specifically, by chamfering two corner parts  71   b  of the end part  71   a,  chamfered parts  77  are formed. A total circumferential length L 11  of the chamfered parts  77  provided on both circumferential sides of the end part  71   a  (double a circumferential length L 13  of a single chamfered part  77 ) is smaller than a circumferential length L 12  of a portion  71   c  of the end part  71   a  other than the chamfered parts  77 . For example, the total length L 11  is less than one-half of the length L 12 . 
     The chamfered parts  77  are provided so as to intersect the central axis line direction at an angle θ 1  of 45degrees or more as viewed in the radial direction. In other words, the chamfered parts  77  are provided so as to intersect the circumferential direction at an angle of less than 45 degrees as viewed in the radial direction. Note that in the present embodiment the chamfered parts  77  intersect the central axis line direction at an angle θ 1  of substantially 45 degrees. In addition, an angle θ 2  formed by each chamfered part  77  and the portion  71   c  of the end part  71   a  other than the chamfered parts  77  is an obtuse angle. 
     In addition, the chamfered parts  77  are provided at a first joint surface  72   a . That is, by chamfering parts (corner parts) of the first joint surface  72   a,  chamfered parts  77  are formed. Note that chamfered parts  287  (see  FIG. 13 ) are provided at a second joint surface  282   a.  In addition, chamfered parts  277  are provided at portions of a first leg part  71  more on the end side than a first joint surface  272   a.  In addition, the chamfered parts  287  are provided at portions of a second leg part  81  more on the end side than the second joint surface  282   a.    
     In addition, as shown in  FIG. 10 , the first joint surface  72   a  and the second joint surface  82   a  both are provided so as to intersect the central axis line direction as viewed in the circumferential direction. The chamfered parts  77  are provided at the first joint surface  72   a  which is provided so as to intersect the central axis line direction. That is, the chamfered parts  77  are provided at the end part  71   a  of the first segment conductor  70  having an end-thinning shape. Likewise, as shown in  FIG. 13 , the chamfered parts  287  are provided at the second joint surface  282   a  which is provided so as to intersect the central axis line direction. That is, the chamfered parts  287  are provided at the end part  281   a  of the second segment conductor  80  having an end-thinning shape. 
     In addition, as described above, as shown in  FIG. 5 , an insulating member  20  is disposed so as to cover inner surfaces on the circumferential side of a slot  12  (circumferential side surfaces  13   a  of teeth  13 ) and an inner surface on the radial side of the slot  12  (a wall part  11   a  of the back yoke  11 ). As shown in  FIG. 16 , the chamfered parts  77  are provided at edge parts  71   d  on the circumferential side of the first facing surface  72  (side surfaces on the circumferential side of the end part  71   a ) that face the insulating member  20 . In addition, the edge parts  71   d  on the circumferential side of the end part  71   a  are disposed so as to be in contact with the insulating member  20  or to be slightly spaced apart from the insulating member  20 . 
     As shown in  FIG. 16 , the chamfered parts  77  have a linear shape that linearly intersects a plane perpendicular to the central axis line direction. That is, the chamfered parts  77  have a flat plane shape. 
     Note that corner parts  71   e  (four corner parts  71   e ) of the leg part  42   a  are chamfered, and the chamfered parts  77  are provided separately from this chamfering. 
     Likewise, as shown in  FIG. 15 , chamfered parts  87  are provided at edge parts  81   d  on both circumferential sides of an end part  81   a  of a second segment conductor  80  as viewed in the radial direction (see  FIG. 12 ). In addition, the total circumferential length of the chamfered parts  87 , the angle of inclination of the chamfered parts  87  with respect to the central axis line direction, and the shape (linear shape) of the chamfered parts  87  are the same as those of the above-described chamfered parts  77 . 
     In addition, chamfered parts  277  are provided at edge parts  271   d  on both circumferential sides of an end part  271   a  (see  FIG. 13 ) of the first segment conductor  70  as viewed in the radial direction. In addition, the total circumferential length of the chamfered parts  277 , the angle of inclination of the chamfered parts  277  with respect to the central axis line direction, and the shape (linear shape) of the chamfered parts  277  are the same as those of the above-described chamfered parts  77 . 
     In addition, chamfered parts  287  are provided at edge parts  281   d  on both circumferential sides of an end part  281   a  (see  FIG. 13 ) of the second segment conductor  80  as viewed in the radial direction. In addition, the total circumferential length of the chamfered parts  287 , the angle of inclination of the chamfered parts  287  with respect to the central axis line direction, and the shape (linear shape) of the chamfered parts  287  are the same as those of the above-described chamfered parts  77 . 
     In addition, in the present embodiment, as shown in  FIGS. 11 to 13 , the first facing surface  72  ( 272 ) of the first segment conductor  70  and the second facing surface  82  ( 282 ) of the second segment conductor  80  are provided so as to radially face each other and extend in the central axis line direction. The chamfered parts  77  ( 277 ,  87 ,  287 ) are provided at an end and edge parts on both circumferential sides of at least one (both in the present embodiment) of the first facing surface  72  ( 272 ) of the first segment conductor  70  and the second facing surface  82  ( 282 ) of the second segment conductor  80 . 
     In addition, in the present embodiment, the first segment conductor  70  includes the first other end surface  73  provided on a radially opposite side to the first facing surface  72  ( 272 ) and provided so as to extend in the central axis line direction. In addition, the second segment conductor  80  includes the second one end surface  84  provided on a radially opposite side to the second facing surface  82  ( 282 ) and provided so as to extend in the central axis line direction. The chamfered parts  77  ( 277 ,  87 ,  287 ) are provided at an end and edge parts on both circumferential sides of at least one (both in the present embodiment) of the first other end surface  73  of the first segment conductor  70  and the second one end surface  84  of the second segment conductor  80 . Note that the first other end surface  73  and the second one end surface  84  are an example of “back surfaces” in the claims. 
     In addition, in the present embodiment, as shown in  FIGS. 11 and 13 , a line segment L 21  that forms an outer edge of the chamfered part  77  ( 277 ) provided at the first facing surface  72  ( 272 ) and a line segment L 22  that forms an outer edge of the chamfered part  77  ( 277 ) provided at the first other end surface  73  are provided on the same plane. Likewise, as shown in  FIGS. 12 and 13 , a line segment L 23  that forms an outer edge of the chamfered part  87  ( 287 ) provided at the second facing surface  82  ( 282 ) and a line segment L 24  that forms an outer edge of the chamfered part  87  ( 287 ) provided at the second one end surface  84  are provided on the same plane. 
     &lt;Configuration of Insulating Parts&gt; 
     In addition, as shown in  FIG. 8 , the coil part  30  is provided with insulating parts  120 . One of a plurality of parallelly arranged segment conductors  40  has an insulating part  120  provided at a portion of a conductor surface  40   b  thereof (see  FIG. 8( b ) ) at an axial location corresponding to a joint portion  90  of other segment conductors  40  disposed so as to be radially adjacent to the one segment conductor  40  (hereinafter, this joint portion  90  is referred to as “adjacent joint portion  90 ”), the insulating part  120  having a thickness t 2  larger than a thickness t 1  of an insulating film  40   a  of the adjacent joint portion  90 . 
     (Manufacturing Device for the Stator) 
     Next, a manufacturing device  200  for the stator  100  will be described. In the present embodiment, as shown in  FIG. 14 , the manufacturing device  200  for the stator  100  includes pressing jigs  201 . The pressing jigs  201  independently and radially press the first leg parts  71  of the first segment conductors  70  and the second leg parts  81  of the second segment conductors  80  which are disposed in the plurality of slots  12 , on a per slot  12  basis. Specifically, as shown in  FIG. 17 , the pressing jigs  201  are disposed for the respective plurality of slots  12  and configured to be radially movable. In addition, a plurality of (the same number as the number of the slots  12 ) pressing jigs  201  are provided for the respective plurality of slots  12  and configured to be independently and radially movable on a per pressing jig  201  basis. 
     In addition, the manufacturing device  200  for the stator  100  includes movement mechanism parts  202  that allow the pressing jigs  201  to independently move on a per slot  12  basis. The movement mechanism parts  202  are provided for the respective plurality of pressing jigs  201  and configured to be able to adjust the amount of radial movement on a per pressing jig  201  basis. The movement mechanism parts  202  are composed of, for example, actuators. 
     In addition, as shown in  FIG. 14 , each pressing jig  201  includes contact portions  201   a  that come into contact with a first segment conductor  70  and a second segment conductor  80 . Each contact portion  201   a  has a shape whose corner parts are chamfered as viewed in the circumferential direction. 
     In addition, two contact portions  201   a  are provided so as to protrude toward the radial outer side. The two contact portions  201   a  are provided so as to be axially separated from each other. In addition, the two contact portions  201   a  are configured to press locations corresponding to joint portions  90  of leg parts  42   a  and  42   b  (see  FIG. 14 ). By the pressing jig  201  pressing the leg parts  42   a  and  42   b,  the joint portions  90  provided on a Z 1 -direction side and the joint portions  90  provided on a Z 2 -direction side are simultaneously pressed by the two contact portions  201   a,  respectively. 
     In addition, as shown in  FIG. 14 , the manufacturing device  200  for the stator  100  is provided with a push-out member  203  and a holding member  204 . The holding member  204  is configured to hold the pressing jig  201  and the push-out member  203 . In addition, the push-out member  203  is formed, for example, in wedge shape (tapered shape) that becomes gradually thinner toward one axial side, and is configured such that axial movement of the push-out member  203  presses (pushes out) the pressing jig  201  toward the radial outer side, and a pressing force is transmitted to segment conductors  40  while allowing the pressing jig  201  to move toward the radial outer side. 
     (Method for Manufacturing the Stator) 
     Next, a method for manufacturing the stator  100  according to the present embodiment will be described.  FIG. 18  shows a flowchart for describing the method for manufacturing the stator  100 . 
     (Step of Preparing Segment Conductors) 
     First, at step S 1 , a plurality of segment conductors  40  are prepared. Specifically, there are prepared power conductors  50  that form power-line connection end parts Pt for the respective phases of a Y-connected coil part  30 ; neutral point conductors  60  that form neutral point connection end parts Nt for the respective phases of the coil part  30 ; and general conductors  41  that form other portions of the coil part  30 . 
     For example, as shown in  FIG. 8( a ) , an insulating film  40   a  made of an insulating material such as polyimide is formed (coated) on a rectangular conductor surface  40   b  made of a conductive material such as copper. Thereafter, conductors (rectangular conducting wires) having the insulating films  40   a  formed thereon are shaped by a forming jig (not shown), by which general conductors  41  (see  FIG. 9 ), outside diameter side power conductors  52  and inside diameter side power conductors  53  for forming power conductors  50 , outside diameter side neutral point conductors  61 , and inside diameter side neutral point conductors  62  are formed. 
     &lt;Formation of General Conductors&gt; 
     Specifically, as shown in  FIG. 9 , a pair of leg parts  42   a  and  42   b  having different axial lengths and disposed in different slots  12  (e.g., the slot pitch is six) and a coil end part  43  that connects the pair of leg parts  42   a  and  42   b  are formed, by which a general conductor  41  is formed. Note that the formation of power conductors  50  and neutral point conductors  60  is omitted. 
     In addition, as shown in  FIG. 15 , chamfered parts  77  and chamfered parts  277  are formed in advance at first leg parts  71  (a leg part  42   a  and a leg part  42   b ) of a first segment conductor  70 . In addition, chamfered parts  87  and chamfered parts  287  are formed in advance at second leg parts  81  (a leg part  42   a  and a leg part  42   b ) of a second segment conductor  80 . 
     &lt;Formation of Insulating Parts&gt; 
     Then, at step S 2  (see  FIG. 18 ), an insulating part  120  having a thickness t 2  larger than a thickness t 1  of the insulating film  40   a  formed at a joint portion  90  is provided on the conductor surface  40   b  of each segment conductor  40 . 
     As shown in  FIG. 9 , by mounting an insulating member  121  on a leg part  42   a  having a longer axial length out of a pair of leg parts  42   a  and  42   b,  an insulating part  120  is formed. Specifically, an insulating member  121  is mounted on each of the leg parts  42   a  of the general conductors  41 , the leg parts  42   a  of the outside diameter side power conductors  52 , and the leg parts  42   a  of the outside diameter side neutral point conductors  61 . 
     Specifically, as shown in  FIG. 8( b ) , a sheet-like insulating member  121  having a thickness t 3  smaller than the thickness t 1  is wound around a leg part  42   a  once or more and fixed. By this, when the number of windings is one, an insulating part  120  having a thickness t 2  (=t 1 +t 3 ) larger than the thickness t 1  is formed on the leg part  42   a.    
     (Formation of a First Coil Assembly and a Second Coil Assembly) 
     At step S 3  (see  FIG. 18 ), as shown in  FIG. 3 , a first coil assembly  30   a  and a second coil assembly  30   b  each having an annular shape and including a plurality of segment conductors  40  are formed. 
     As shown in  FIG. 3 , a first coil assembly  30   a  and a second coil assembly  30   b  each having an annular shape and including a plurality of segment conductors  40  are formed such that the insulating part  120  of one segment conductor  40  is located in a position radially adjacent to a joint portion  90  of other segment conductors  40  disposed so as to be radially adjacent to the one segment conductor  40 . Note that although  FIG. 3  only shows some (two) of the plurality of insulating parts  120  by hatching for the sake of description, in the present embodiment, all leg parts  42   a  are provided with the insulating parts  120 . 
     Specifically, as shown in  FIG. 14 , in the first coil assembly  30   a  and the second coil assembly  30   b,  the segment conductors  40  are formed such that a plurality of (e.g., eight) segment conductors  40  are parallelly and radially arranged, and such a number of segment conductors  40  that is equal to the number of the slots  12  are parallelly and circumferentially arranged. At this time, the first coil assembly  30   a  and the second coil assembly  30   b  are formed such that the insulating part  120  of one of the plurality of parallelly arranged segment conductors  40  is located in an axial position corresponding to a joint portion  90  of other segment conductors  40  disposed so as to be radially adjacent to the one segment conductor  40 . 
     (Step of Disposing Insulating Members in the Slots) 
     At step S 4  (see  FIG. 18 ), as shown in  FIG. 19 , an insulating member  20  is disposed in each of the plurality of slots  12 . The insulating member  20  is disposed so as to be exposed or open on both axial sides and closed on the radial inner side. In addition, as shown in  FIG. 3 , the disposed insulating member  20  is held in the slot  12  by collar parts  22  on both axial sides. 
     (Step of Disposing the Segment Conductors in the Slots) 
     At step S 5  (see  FIG. 18 ), as shown in  FIG. 3 , the plurality of segment conductors  40  are disposed in the plurality of slots  12 . Specifically, the first coil assembly  30   a  and the second coil assembly  30   b  are allowed to axially move relative to each other toward the plurality of slots  12 , by which each of the leg parts  42   a  and  42   b  of the first coil assembly  30   a  and the second coil assembly  30   b  is disposed in one of the plurality of slots  12 . For example, the first coil assembly  30   a  is allowed to move in parallel (linearly move) to the stator core  10  in the arrow “Z 2 ” direction and the second coil assembly  30   b  is allowed to move in parallel (linearly move) to the stator core  10  in the arrow “Z 1 ” direction, by which each of the leg parts  42   a  and  42   b  is disposed in one of the plurality of slots  12  (the slots  12  having the insulating members  20  disposed therein). 
     Here, as shown in  FIG. 20 , since a leg part  42   a  of a first segment conductor  70  is provided with chamfered parts  77 , when the leg part  42   a  is inserted into a slot  12  (in space enclosed by an insulating member  20 ), an end part (an end part  71   a ) of the leg part  42   a  can be prevented from getting stuck in corner parts of the slot  12  (corner parts of teeth  13 ). Likewise, since a leg part  42   b  of the first segment conductor  70  is provided with chamfered parts  277 , when the leg part  42   b  is inserted into a slot  12 , an end part  71   a  of the leg part  42   b  can be prevented from getting stuck in corner parts of the slot  12 . Likewise, since leg parts  42   a  and  42   b  of a second segment conductor  80  are provided with chamfered parts  87  and  287 , respectively, end parts  81   a  and  281   a  can be prevented from getting stuck in corner parts of slots  12 . In addition, the insulating members  20  can be prevented from getting damaged by the corner parts of the leg parts  42   a  and the leg parts  42   b  inserted in the slots  12  (in pieces of space enclosed by the insulating members  20 ). 
     In addition, as shown in  FIG. 14 , by disposing the first coil assembly  30   a  and the second coil assembly  30   b  in the slots  12 , the plurality of segment conductors  40  are disposed in the slots  12  such that the insulating part  120  of one of a plurality of parallelly and radially arranged segment conductors  40  is located in an axial position corresponding to a joint portion  90  disposed so as to be radially adjacent to the insulating part  120 . 
     (Step of Joining Together the Leg Parts) 
     At step S 6  (see  FIG. 18 ), as shown in  FIG. 14 , the first leg parts  71  of the first segment conductors  70  and the second leg parts  81  of the second segment conductors  80  that axially face the first segment conductors  70  are radially pressed (pressurized) on a per slot  12  basis, by which the first leg parts  71  and the second leg parts  81  are joined together in the slot  12 . 
     Note that by heating at least a joint material  130  by a heating device (not shown) while leg parts  42   a  and  42   b  are pressed by a pressing jig  201 , at least a part of a first facing surface  72  and at least a part of a second facing surface  82  are joined together, forming a joint portion  90 . Specifically, a first joint surface  72   a  (see  FIG. 10 ) and a second joint surface  82   a  are joined together. In addition, a first joint surface  272   a  (see  FIG. 13 ) and a second joint surface  282   a  are joined together. 
     Then, in one slot  12 , first leg parts  71  of a power conductor  50  and a neutral point conductor  60  and second leg parts  81  which are either one of leg parts  42   a  and  42   b  of general conductors  41  are joined together, and in another slot  12 , second leg parts  81  which are the other one of the leg parts  42   a  and  42   b  of the general conductors  41  and first leg parts  71  of general conductors  41  are joined together. As a result, a wave-shaped coil part  30  is formed. 
     As shown in  FIG. 14 , a portion where a first leg part  71  and a second leg part  81  are joined together serves as an electrically joined joint portion  90 . By this, an insulating part  120  is disposed at a location (axial location) radially adjacent to the joint portion  90 . In addition, an axial location P 11  of a joint portion  90  is a different location than an axial location P 12  of a joint portion  90  of segment conductors  40  radially adjacent thereto. 
     In addition, the first leg parts  71  and the second leg parts  81  together with the insulating members  20  whose radial inner sides are closed are pressed by the pressing jigs  201  from the radial inner side. Thereafter, as shown in  FIG. 2 , a stator  100  is completed. Note that as shown in  FIG. 1 , by combining the stator  100  with a rotor  101 , a rotating electrical machine  102  is manufactured. 
     [Advantageous Effects of the Present Embodiment] 
     In the above-described present embodiment, the following advantageous effects can be obtained. 
     In the present embodiment, as described above, facing surfaces ( 72 ,  82 ,  272 ,  282 ) which are portions where a first segment conductor ( 70 ) and a second segment conductor ( 80 ) are joined together and which are provided at an end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and an end part ( 81   a,    281   a ) of the second segment conductor ( 80 ) are disposed so as to overlap each other as viewed in the radial direction, and the end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end part ( 81   a ,  281   a ) of the second segment conductor ( 80 ) each are provided with chamfered parts ( 77 ,  87 ,  277 ,  287 ) at edge parts on both circumferential sides thereof ( 71   d,    81   d,    271   d,    281   d ). By this, since the facing surface ( 72 ,  272 ) of the first segment conductor ( 70 ) and the facing surface ( 82 ,  282 ) of the second segment conductor ( 80 ) are provided so as to overlap each other as viewed in the radial direction, even when chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at the end part of at least one of the first segment conductor ( 70 ) and the second segment conductor ( 80 ), the amount of reduction in the area of the facing surface ( 72 ,  82 ,  272 ,  282 ) can be reduced. As a result, a shortage of a joint area can be prevented. 
     In addition, since the facing surfaces ( 72 ,  82 ,  272 ,  282 ) provided at the end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end part ( 81   a,    281   a ) of the second segment conductor ( 80 ) are disposed so as to overlap each other as viewed in the radial direction, a joint material ( 130 ) disposed on the facing surfaces ( 72 ,  82 ,  272 ,  282 ) can be prevented from flowing in the radial direction. As a result, leg parts ( 42   a,    42   b ) can be appropriately bonded together. In addition, since the end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end part ( 81   a,    281   a ) of the second segment conductor ( 80 ) each are provided with the chamfered parts ( 77 ,  87 ,  277 ,  287 ) at edge parts on both circumferential sides thereof ( 71   d,    81   d,    271   d,    281   d ), when the first segment conductor ( 70 ) and the second segment conductor ( 80 ) are inserted into a slot ( 12 ), at least one of the first segment conductor ( 70 ) and the second segment conductor ( 80 ) can be smoothly inserted into the slot ( 12 ). By these configurations, the leg parts ( 42   a,    42   b ) can be appropriately bonded together while the insertion properties of the leg parts ( 42   a,    42   b ) into the slot ( 12 ) improve. In addition, since the end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end part ( 81   a,    281   a ) of the second segment conductor ( 80 ) are provided with the chamfered parts ( 77 ,  87 ,  277 ,  287 ), an insulating member ( 20 ) disposed in the slot ( 12 ) can be prevented from getting damaged by the first segment conductor ( 70 ) and the second segment conductor ( 80 ). 
     In addition, in the present embodiment, as described above, a total circumferential length (L 11 ) of the chamfered parts ( 77 ,  87 ,  277 ,  287 ) provided on both circumferential sides of the end part ( 71   a,    81   a,    271   a,    281   a ) is smaller than a circumferential length (L 12 ) of a portion ( 71 C) of the end part ( 71   a,    81   a,    271   a,    281   a ) other than the chamfered parts ( 77 ,  87 ,  277 ,  287 ). By such a configuration, unlike a case in which the total circumferential length (L 11 ) of the chamfered parts ( 77 ,  87 ,  277 ,  287 ) is greater than or equal to the circumferential length (L 12 ) of the portion ( 71 C) of the end part ( 71   a,    81   a,    271   a,    281   a ) other than the chamfered parts ( 77 ,  87 ,  277 ,  287 ), the size of the chamfered parts ( 77 ,  87 ,  277 ,  287 ) is relatively small, and thus, a reduction in the size of the end part ( 71   a,    81   a,    271   a,    281   a ) where the facing surface ( 72 ,  82 ,  272 ,  282 ) is provided can be prevented. By this, joint strength between the leg parts ( 42   a,    42   b ) can be ensured. 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided so as to intersect the central axis line direction at an angle of 45 degrees or more as viewed in the radial direction. By such a configuration, since the size of portions of the end part ( 71   a,    81   a,    271   a,    281   a ) that are cut away as a result of the formation of the chamfered parts ( 77 ,  87 ,  277 ,  287 ) can be made relatively small, a reduction in the size of the end part ( 71   a,    81   a,    271   a,    281   a ) where the facing surface ( 72 ,  82 ,  272 ,  282 ) is provided can be effectively prevented. 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  287 ) are provided at a first joint surface ( 72   a ) and a second joint surface ( 282   a ). By such a configuration, since the chamfered parts ( 77 ,  287 ) are provided at the first joint surface ( 72   a ) (the second joint surface ( 282   a )) that comes into contact with corners of a slot ( 12 ) (corners of teeth ( 13 )) at a relatively early stage upon inserting the first segment conductor ( 70 ) (the second segment conductor ( 80 )) into the slot ( 12 ), the first segment conductor ( 70 ) (the second segment conductor ( 80 )) can be more smoothly inserted into the slot ( 12 ). 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  287 ) are provided at the first joint surface ( 72   a ) and the second joint surface ( 282   a ) which are provided so as to intersect the central axis line direction. By such a configuration, compared to a case in which the first joint surface ( 72   a ) and the second joint surface ( 282   a ) are provided along the central axis line direction, the areas of the first joint surface ( 72   a ) and the second joint surface ( 282   a ) can be increased. Therefore, by providing the chamfered parts ( 77 ,  287 ) at the first joint surface ( 72   a ) and the second joint surface ( 282   a ) which are provided so as to intersect the central axis line direction, the influence of a reduction in joint area caused by the formation of the chamfered parts ( 77 ,  287 ) can be reduced. 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at both of the end parts ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end parts ( 81   a,    281   a ) of the second segment conductor ( 80 ). By such a configuration, both the first segment conductor ( 70 ) and the second segment conductor ( 80 ) can be smoothly inserted into slots ( 12 ), and damage to insulating members ( 20 ) by both the first segment conductor ( 70 ) and the second segment conductor ( 80 ) can be prevented. 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at the edge parts ( 71   d,    81   d,    271   d,    281   d ) on the circumferential side of the facing surface ( 72 ,  82 ,  272 ,  282 ) that face an insulating member ( 20 ). By such a configuration, since the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at the edge parts ( 71   d,    81   d,    271   d,    281   d ) of the facing surface ( 72 ,  82 ,  272 ,  282 ) that face the insulating member ( 20 ), damage to the insulating member ( 20 ) can be effectively prevented. 
     In addition, in the present embodiment, as described above, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) have a linear shape that linearly intersects the circumferential direction as viewed in the radial direction. By such a configuration, since the chamfered parts ( 77 ,  87 ,  277 ,  287 ) have a relatively simple shape, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) can be easily formed. 
     In addition, in the present embodiment, as described above, a first leg part ( 71 ) of the first segment conductor ( 70 ) and a second leg part ( 81 ) of the second segment conductor ( 80 ) are joined together in a slot ( 12 ). By such a configuration, since the end part ( 71   a,    271   a ) of the first segment conductor ( 70 ) and the end part ( 81   a,    281   a ) of the second segment conductor ( 80 ) each are provided with the chamfered parts ( 77 ,  87 ,  277 ,  287 ) at edge parts on both circumferential sides thereof ( 71   d,    81   d,    271   d,    281   d ), the first leg part ( 71 ) and the second leg part ( 81 ) can be smoothly inserted into the slot ( 12 ) and joined together. 
     In addition, in the present embodiment, as described above, the facing surface ( 72 ,  272 ) of the first segment conductor ( 70 ) and the facing surface ( 82 ,  282 ) of the second segment conductor ( 80 ) are provided so as to radially face each other and extend in the central axis line direction. The chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at an end and edge parts on both circumferential sides of at least one of the facing surface ( 72 ,  272 ) of the first segment conductor ( 70 ) and the facing surface ( 82 ,  282 ) of the second segment conductor ( 80 ). By such a configuration, even when the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at the end part of at least one of the first segment conductor ( 70 ) and the second segment conductor ( 80 ), the amount of reduction in the area of the facing surface ( 72 ,  82 ,  272 ,  282 ) can be effectively reduced. 
     In addition, in the present embodiment, as described above, the first segment conductor ( 70 ) and the second segment conductor ( 80 ) each include a back surface ( 73 ,  84 ) provided on a radially opposite side to the facing surface ( 72 ,  82 ,  272 ,  282 ) and provided so as to extend in the central axis line direction. The chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided at an end and edge parts on both circumferential sides of at least one of the back surface ( 73 ) of the first segment conductor ( 70 ) and the back surface ( 84 ) of the second segment conductor ( 80 ). By such a configuration, since the chamfered parts ( 77 ,  87 ,  277 ,  287 ) are provided so as to go across from the facing surface ( 72 ,  82 ,  272 ,  282 ) to the back surface ( 73 ,  84 ), the first segment conductor ( 70 ) and the second segment conductor ( 80 ) can be smoothly inserted into the slot ( 12 ). 
     In addition, in the present embodiment, as described above, a line segment (L 21 , L 23 ) that forms an outer edge of the chamfered part ( 77 ,  87 ,  277 ,  287 ) provided at the facing surface ( 72 ,  82 ,  272 ,  282 ) and a line segment (L 22 , L 24 ) that forms an outer edge of the chamfered part ( 77 ,  87 ,  277 ,  287 ) provided at the back surface ( 73 ,  84 ) are provided on the same plane. By such a configuration, since the chamfered parts ( 77 ,  87 ,  277 ,  287 ) have a planar shape, the chamfered parts ( 77 ,  87 ,  277 ,  287 ) can be easily formed. 
     [Variants] 
     Note that the presently disclosed embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the preferred embodiment is indicated by the claims rather than the description of the above-described embodiment, and all changes (variants) which come within the meaning and range of equivalency of the claims are further embraced therein. 
     For example, although the above-described embodiment shows an example in which two leg parts ( 42   a  and  42   b ) of a segment conductor have different lengths, the preferred embodiment is not limited thereto. For example, the two leg parts of the segment conductor may have the same length. 
     In addition, although the above-described embodiment shows an example in which chamfered parts are provided so as to intersect the central axis line direction at an angle of substantially 45 degrees as viewed in the radial direction, the preferred embodiment is not limited thereto. For example, the chamfered parts may be provided so as to intersect the central axis line direction at an angle of greater than 45 degrees as viewed in the radial direction. 
     In addition, although the above-described embodiment shows an example in which the chamfered parts are provided at both of a pair of leg parts, the preferred embodiment is not limited thereto. For example, the chamfered parts may be provided at only one of the pair of leg parts. 
     In addition, although the above-described embodiment shows an example in which the chamfered parts are provided at both of first leg parts of a first segment conductor and second leg parts of a second segment conductor, the preferred embodiment is not limited thereto. For example, the chamfered parts may be provided at only the first leg parts of the first segment conductor without being provided at the second segment conductor, or may be provided at only the second leg parts of the second segment conductor without being provided at the first segment conductor. 
     In addition, although the above-described embodiment shows an example in which the chamfered parts have a linear shape with respect to a plane perpendicular to the central axis line direction as viewed in the radial direction, the preferred embodiment is not limited thereto. For example, as shown in a first variant shown in  FIG. 21 , chamfered parts  377  may be configured to have a round shape (R-shape) as viewed in the radial direction. By such a configuration, since the chamfered parts  377  have a round shape, leg parts  42   a  and  42   b  can be further prevented from getting stuck in corner parts of a slot  12  (corner parts of teeth  13 ) and an insulating member  20  can be further prevented from getting damaged. 
     In addition, although the above-described embodiment shows an example in which the chamfered parts are provided at end parts of a first segment conductor (second segment conductor) as viewed in the radial direction, the preferred embodiment is not limited thereto. For example, as shown in a second variant shown in  FIGS. 22 and 23 , a chamfered part  677  may be provided at an end part of a first segment conductor  70  (second segment conductor  80 ) as viewed in the circumferential direction in addition to the radial direction. That is, the end part is provided with both of chamfered parts  577  that intersect the central axis line direction as viewed in the radial direction (see  FIG. 22 ) and the chamfered part  677  that intersects the circumferential direction as viewed in the circumferential direction (see  FIG. 23 ). By this, for example, when the first segment conductor  70  and the second segment conductor  80  are inserted into a slot  12 , the segment conductor being inserted (the first segment conductor  70  or the second segment conductor  80 ) can be prevented from getting stuck in a segment conductor (a first segment conductor  70  or a second segment conductor  80 ) disposed so as to be radially adjacent thereto. As a result, the insertion properties of the first segment conductor  70  and the second segment conductor  80  into the slot  12  can be further improved. 
     In addition, although the above-described embodiment shows an example in which a first leg part of a first segment conductor and a second leg part of a second segment conductor are joined together in a slot, the preferred embodiment is not limited thereto. For example, a leg part of a first segment conductor and a leg part of a second segment conductor may be joined together on an axial outside of an end surface ( 10   a  or  10   b ) of the stator core. In this case, facing surfaces where the leg parts are joined together are disposed on the axial outside of the end surface ( 10   a  or  10   b ) of the stator core. 
     In addition, although the above-described embodiment shows an example in which, as shown in  FIG. 10 , the first joint surface  72   a  (first facing surface  72 ) and the second joint surface  82   a  (second facing surface  82 ) both are provided so as to intersect the central axis line direction as viewed in the circumferential direction, the preferred embodiment is not limited thereto. For example, like a first segment conductor  470  and a second segment conductor  480  according to a third variant shown in  FIGS. 24 and 25 , a first facing surface  472  and a second facing surface  482  may be flat surfaces lying in the central axis line direction. Note that, as shown in  FIG. 26 , chamfered parts  477   a  are formed at an end and on both circumferential sides of a first facing surface  472  (and a back surface  474 ). In addition, as shown in  FIG. 27 , chamfered parts  487   a  are formed at an end and on both circumferential sides of a second facing surface  482  (and a back surface  484 ). In addition, the end of the first segment conductor  470  has chamfered parts  477   b  formed also on both radial edges thereof In addition, the end of the second segment conductor  480  has chamfered parts  487   b  formed also on both radial edges thereof. Note that, in the third variant, the first facing surface  472  indicates a surface of a first segment conductor end part  470   b  of the first segment conductor  470  that faces in the radial direction, the first segment conductor end part  470   b  having a thickness t 12  smaller than a first segment conductor main body part  470   a  having a thickness t 11 . Likewise, the second facing surface  482  indicates a surface of a second segment conductor end part  480   b  of the second segment conductor  480  that faces in the radial direction, the second segment conductor end part  480   b  having a thickness t 14  smaller than a second segment conductor main body part  480   a  having a thickness t 13 . 
     In addition, as shown in  FIG. 25 , by joining together a part of a first facing surface  472  and a part of a second facing surface  482  with a conductive adhesive  491 , a joint portion  490  is formed. In addition, a joint portion insulating member  492  for insulating the joint portion  490  is provided between a back surface  474  of a first segment conductor  470  and a back surface  484  of a second segment conductor  480 . 
     REFERENCE SIGNS LIST 
       10 : Stator core (armature core),  12 : Slot,  20 : Insulating member,  30 : Coil part,  40 : Segment conductor,  42   a,    42   b : Leg part,  70 ,  470 : First segment conductor,  71   a,    271   a : End part,  71   c : Portion (other than chamfered parts),  71   d,    81   d,    271   d,    281   d : Edge parts (on both circumferential sides),  72 ,  272 : First facing surface (facing surface),  72   a,    272   a : First joint surface,  73 : First other end surface (back surface),  77 ,  87 ,  277 ,  287 ,  377 ,  577 : Chamfered part,  80 ,  480 : Second segment conductor,  81   a,    281   a : End part,  82 ,  282 : Second facing surface (facing surface),  82   a,    282   a : Second joint surface,  84 : Second one end surface (back surface),  100 : Stator (armature),  474 : Back surface, and  484 : Back surface