Patent Publication Number: US-2021167657-A1

Title: Armature

Description:
TECHNICAL FIELD 
     The present disclosure relates to an armature. 
     BACKGROUND ART 
     Conventionally, an armature including an armature core provided with a plurality of slots extending in a central axis direction is known. Such an armature is disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2006-141076 (JP 2006-141076 A). 
     JP 2006-141076 A discloses a rotary electric machine stator (hereinafter, referred to as a “stator”) having a stator core provided with a plurality of slots extending in a central axis direction (axial direction). A coil is disposed in the slots of the stator. The coil is divided into three parts. Specifically, the coil is configured of one linear portion conductor segment that has a linear shape and two coil end portion conductor segments that have a substantially U-shape (or a substantially V-shape). 
     Further, in JP 2006-141076 A, an insulating insulator is disposed in each of the slots. The insulating insulator is made of resin. Further, the insulating insulator is provided with an insertion hole into which the linear portion conductor segment is inserted. A plurality of insertion holes is provided in one insulating insulator. The linear portion conductor segment and the coil end portion conductor segment are joined inside the insertion hole of the insulating insulator. In addition, since the linear portion conductor segment is inserted in each of the insertion holes, the linear portion conductor segments are insulated from each other (and the joint portions between the linear portion conductor segment and the coil end portion conductor segment are insulated from each other). 
     RELATED ART DOCUMENTS 
     Patent Documents 
     Patent Document 1: Japanese Unexamined Patent Application Publication No. 2006-141076 (JP 2006-141076 A) 
     SUMMARY OF THE DISCLOSURE 
     Problem to be Solved by the Disclosure 
     However, in the armature of JP 2006-141076 A, since the insulating insulator for insulating the joint portions between the linear portion conductor segment and the coil end portion conductor segment from each other are made of resin, the insulating insulator (insulating member) is relatively difficult to be formed. 
     The present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide an armature that can insulate joint portions from each other with an insulating member that can be easily formed. 
     Means for Solving the Problem 
     In order to achieve the object described above, an armature of a first aspect of the disclosure includes: an armature core provided with a plurality of slots extending in a central axis direction; and a coil portion that includes a plurality of first segment conductors disposed on one side of the armature core in the central axis direction, and a plurality of second segment conductors disposed on another side of the armature core in the central axis direction so as to face the first segment conductors in the central axis direction, and that is formed by joining the plurality of first segment conductors and the plurality of second segment conductors, in one slot of the slots or on an outer side of the one slot in the central axis direction; and a joint portion insulating member that has a sheet shape and that insulates joint portions in which the first segment conductor and the second segment conductor are joined between coils adjacent to each other in a radial direction in the one slot, in which the joint portion insulating member includes at least two or more facing surface insulating parts that cover facing surfaces of the joint portions being radially adjacent to each other, and a circumferential surface insulating part that is continuous from both end portions of the facing surface insulating parts in a circumferential direction and that covers one circumferential surface of the joint portions adjacent in the radial direction for at least a predetermined distance along the radial direction, and the facing surface insulating parts adjacent in the radial direction are connected by the circumferential surface insulating part in one or another circumferential direction. 
     In the armature according to the first aspect of the present disclosure, as described above, since the joint portion insulating member that insulates the joint portions from each other has a sheet shape, it is possible to easily form the joint portion insulating member by bending the insulating member that has a sheet shape. As a result, the joint portions can be insulated from each other by the joint portion insulating member that can be easily formed. The joint portion insulating member includes the facing surface insulating part that covers the facing surfaces of the joint portions adjacent in the radial direction, and the circumferential surface insulating part that is continuous from both end portions of the facing surface insulating part in the circumferential direction and that covers one of the joint portions adjacent in the radial direction for at least the predetermined distance. Thus, the joint portions adjacent in the radial direction are insulated by the joint portion insulating member. Further, since the facing surface insulating parts adjacent to each other in the radial direction are connected to each other by the circumferential surface insulating part in one or the other of the circumferential directions, the joint portion insulating member can be easily expanded and contracted in the radial direction, unlike the case in which the facing surface insulating parts adjacent in the radial direction are connected by the circumferential surface insulating part in both circumferential directions. Further, since the joint portion insulating member has a relatively thin sheet shape, a space factor of the coil portion in the slot can be increased. The term “joint portion” has a broad meaning including not only a portion joined with a bonding agent but also a portion that is only in contact without a bonding agent. 
     An armature of a second aspect of the disclosure includes: an armature core provided with a plurality of slots extending in a central axis direction; and a coil portion that includes a plurality of first segment conductors disposed on one side of the armature core in the central axis direction, and a plurality of second segment conductors disposed on another side of the armature core in the central axis direction so as to face the first segment conductors in the central axis direction, and that is formed by joining the plurality of first segment conductors and the plurality of second segment conductors, in one slot of the slots or on an outer side of the one slot in the central axis direction; and a joint portion insulating member that has a sheet shape and that insulates joint portions in which the first segment conductor and the second segment conductor are joined between coils adjacent to each other in a radial direction in the one slot, in which the joint portion insulating member includes a facing surface insulating part that covers facing surfaces of the joint portions being radially adjacent to each other, and a circumferential surface insulating part that is continuous from both end portions of the facing surface insulating part in a circumferential direction and that covers one circumferential surface of the joint portions adjacent in the radial direction for at least an insulation distance, and the facing surface insulating parts adjacent in the radial direction are connected by the circumferential surface insulating part in one or another circumferential direction. 
     In the armature according to the second aspect of the present disclosure, as described above, since the joint portion insulating member that insulates the joining portions from each other has a sheet shape, it is possible to easily form the joint portion insulating member by bending the insulating member that has a sheet shape. As a result, the joint portions can be insulated from each other by the joint portion insulating member that can be easily formed. The joint portion insulating member includes the facing surface insulating part that covers the facing surfaces of the joint portions adjacent in the radial direction, and the circumferential surface insulating part that is continuous from both end portions of the facing surface insulating part in the circumferential direction and that covers one of the joint portions adjacent in the radial direction for at least the insulation distance. Thus, the joint portions adjacent in the radial direction are insulated by the joint portion insulating member. Further, since the facing surface insulating parts adjacent to each other in the radial direction are connected to each other by the circumferential surface insulating part in one or the other of the circumferential directions, the joint portion insulating member can be easily expanded and contracted in the radial direction, unlike the case in which the facing surface insulating parts adjacent in the radial direction are connected by the circumferential surface insulating part in both circumferential directions. Further, since the joint portion insulating member has a relatively thin sheet shape, a space factor of the coil portion in the slot can be increased. 
     Effects of the Disclosure 
     According to the present disclosure, as described above, the joint portions can be insulated from each other by the insulating member that can be easily formed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a plan view showing a configuration of a stator (rotary electric machine) according to a first embodiment. 
         FIG. 2  is a perspective view showing the configuration of the stator according to the first embodiment. 
         FIG. 3  is an exploded perspective view of the stator according to the first embodiment. 
         FIG. 4  is a plan view showing a configuration of a stator core according to the first to third embodiments. 
         FIG. 5  is a sectional view showing a configuration of a first insulating member and a second insulating member according to the first embodiment. 
         FIG. 6  is a circuit diagram showing a wiring configuration of a coil portion according to the first embodiment. 
         FIG. 7  is a perspective view showing a part of a second coil assembly according to the first embodiment. 
         FIG. 8  is a cross-sectional view showing a configuration of a segment conductor according to the first embodiment. 
         FIG. 9  is a figure showing a configuration of a first segment conductor according to the first embodiment. 
         FIG. 10  is a figure showing a configuration of a second segment conductor according to the first embodiment. 
         FIG. 11  is a diagram showing a configuration of a power segment conductor according to the first embodiment. 
         FIG. 12  is a figure showing a configuration of an outer radial side neutral point conductor according to the first embodiment. 
         FIG. 13  is a figure showing a configuration of an inner radial side neutral point conductor according to the first embodiment. 
         FIG. 14  is a sectional view taken along line  1000 - 1000  in  FIG. 1 . 
         FIG. 15  is a figure showing the relationship between a disposition position of a first insulating member and a disposition position of a second insulating member according to the first embodiment. 
         FIG. 16  is a sectional drawing schematically showing a configuration of the first insulating member according to the first embodiment. 
         FIG. 17  is a sectional drawing showing the configuration of the first insulating member and the second insulating member including a fixing layer before foaming according to the first embodiment. 
         FIG. 18  is sectional drawing showing a boundary vicinity of the first insulating member and the second insulating member including the fixing layer after foaming according to the first embodiment. 
         FIG. 19  is a sectional view showing the configuration of the second insulating member according to the first embodiment. 
         FIG. 20  is a perspective view showing the configuration of the second insulating member according to the first embodiment. 
         FIG. 21  is a figure showing the thickness of the first insulating member and the thickness of the second insulating member according to the first embodiment. 
         FIG. 22  is a perspective view showing the configuration of a stator according to a second embodiment. 
         FIG. 23  is an exploded perspective view of the stator according to the second embodiment. 
         FIG. 24  is a cross-sectional view showing a configuration of a segment conductor according to the second embodiment. ( FIG. 24A  is a cross-sectional view of a leg portion.  FIG. 24B  is a cross-sectional view of a coil end portion.) 
         FIG. 25  is a perspective view showing a configuration of a first segment conductor according to the second embodiment. ( FIG. 25A  is a perspective view of the first segment conductor when viewed from an outer radial side.  FIG. 25B  is a perspective view of the first segment conductor when viewed from an inner radial side.) 
         FIG. 26  is a perspective view showing a configuration of a second segment conductor according to the second embodiment. ( FIG. 26A  is a perspective view of the second segment conductor when viewed from an outer radial side.  FIG. 26B  is a perspective view of the second segment conductor when viewed from an inner radial side.) 
         FIG. 27  is a cross-sectional view along the radial direction of the inside of a slot according to the second embodiment. 
         FIG. 28  is a partially enlarged view of a vicinity of a contact portion in  FIG. 27 . 
         FIG. 29  is a sectional drawing showing a configuration of an insulating member according to the second embodiment. 
         FIG. 30  is a sectional drawing showing a configuration of an insulating layer and a fixing layer of the contact portion insulation part according to the second embodiment. 
         FIG. 31  is a sectional drawing showing a configuration of an insulating layer and a fixing layer of a core leg portion insulation part according to the second embodiment. 
         FIG. 32  is a flowchart showing a manufacturing method of the stator according to the second embodiment. 
         FIG. 33  is a perspective view showing a configuration of a stator according to a third embodiment. 
         FIG. 34  is a cross-sectional view along the radial direction of the inside of a slot according to the third embodiment. 
         FIG. 35  is a sectional drawing showing a configuration of an insulating member according to the third embodiment. 
         FIG. 36  is a sectional drawing showing a configuration of an insulating layer and a fixing layer of a contact portion insulation part according to the third embodiment. 
         FIG. 37  is a sectional drawing showing a configuration of an insulating layer and a fixing layer of a core leg portion insulation part according to the third embodiment. 
         FIG. 38  is a sectional drawing of a second insulating member when viewed from above according to a first modification of the first embodiment. 
         FIG. 39  is a sectional drawing of a second insulating member when viewed from above according to a second modification of the first embodiment. 
     
    
    
     MODES FOR CARRYING OUT THE DISCLOSURE 
     Hereinafter, a first embodiment of the present disclosure will be described with reference to the drawings. 
     First Embodiment 
     Structure of Stator 
     The structure of a stator  100  according to the first embodiment will be described with reference to  FIGS. 1 to 21 . The stator  100  has an annular shape centered around a central axis C 1 . The stator  100  is an example of an “armature” in the claims. 
     In the specification of the application, an “axial direction (central axis direction, axis direction)” means a direction (Z direction) along the central axis C 1  of the stator  100  (a rotational axis of a rotor  101 ) as shown in  FIG. 1 . A “circumferential direction” means a circumferential direction (A 1  direction, A 2  direction) of the stator  100 . A “radial direction” means a radial direction (R direction) of the stator  100 . An “inner radial side” means a direction (R 1  direction) toward the central axis C 1  of the stator  100  along the radial direction. Further, an “outer radial side” means a direction (R 2  direction) toward the outside of the stator  100  along the radial direction. 
     The stator  100  configures a part of a rotary electric machine  102  together with the rotor  101 . The rotary electric machine  102  is configured as a motor, a generator, or a motor/generator, for example. As shown in  FIG. 1 , the stator  100  is disposed on the outer radial side the rotor  101  in which a permanent magnet (not shown) is provided. That is, in the first embodiment, the stator  100  configures a part of the inner rotor type rotary electric machine  102 . 
     As shown in  FIG. 2 , the stator  100  includes a stator core  10 , a first insulating member  20 , and a coil portion  30 . Further, as shown in  FIG. 3 , the coil portion  30  includes a first coil assembly  30   a  (non-lead side coil) and a second coil assembly  30   b  (lead side coil). Further, as shown in  FIG. 3 , the coil portion  30  is composed of a plurality of segment conductors  40 . In addition, in the first embodiment, the stator  100  includes a second insulating member  21  that is provided separately from the first insulating member  20 . The stator core  10  is an example of an “armature core” in the claims. The first insulating member  20  is an example of a “core leg portion insulating member” in the claims. The second insulating member  21  is an example of a “joint portion insulating member” in the claims. 
     (Structure of Stator Core) 
     The stator core  10  has a cylindrical shape with the central axis C 1  (see  FIG. 1 ) as the central axis. Further, the stator core  10  is formed, for example, by stacking a plurality of electromagnetic steel plates (for example, silicon steel plates) in the axial direction. Here, in the first embodiment, the stator core  10  is formed by stacking a plurality of silicon steel plates having a thermal expansion coefficient K1. As shown in  FIG. 4 , the stator core  10  is provided with a back yoke  11  having an annular shape when viewed in the axial direction, and a plurality of slots  12  that is provided on the inner radial side of the back yoke  11  and that extends in the axial direction. The stator core  10  is provided with a plurality of teeth  13  on both sides of each slot  12  in the circumferential direction. 
     Each slot  12  is a portion surrounded by a wall portion  11   a  of the back yoke  11  provided on the outer radial side and a circumferential side surface  13   a  of the two teeth  13 . The slot  12  is provided with an opening portion  12   a  that opens to the inner radial side. The slot  12  opens on both sides in the axial direction. The teeth  13  are formed so as to protrude radially inward from the back yoke  11 , and a protruding portion  13   b  configuring an opening portion  12   a  of the slot  12  is formed on a distal end portion on the inner radial side. 
     The opening portion  12   a  has an opening width W 1  in the circumferential direction. Here, the opening width W 1  corresponds to the distance between the distal end portions of the protruding portions  13   b  of the teeth  13 . A width W 2  of a part of the slot  12  in which the coil portion  30  is disposed is larger than the opening width W 1 . That is, the slot  12  is configured as a semi-open type slot. Here, the width W 2  corresponds to the distance between the circumferential side surfaces  13   a  of the teeth  13  disposed on both sides of the slot  12  in the circumferential direction. The width W 2  of the slot  12  is substantially constant in the radial direction. 
     (Structure of Coil Portion) 
     As shown in  FIG. 5 , the coil portion  30  is configured of a flat conductor wire. In the first embodiment, the coil portion  30  is configured of a material having a thermal expansion coefficient K2 larger than the thermal expansion coefficient K1 (linear expansion coefficient) of the stator core  10 . For example, the coil portion  30  (conductor body  40   c ) is made of copper or aluminum having the thermal expansion coefficient K2 larger than the thermal expansion coefficient K1. 
     As shown in  FIGS. 2 and 3 , the coil portion  30  is formed by the first coil assembly  30   a  provided on one axial side (arrow Z 2  direction side) and the second coil assembly  30   b  provided on the other axial side (arrow Z 1  direction side) being combined in the axial direction and joined. The first coil assembly  30   a  and the second coil assembly  30   b  are each formed in an annular shape centered around the same central axis C 1  (see  FIG. 1 ) as the stator core  10 . As shown in  FIG. 5 , in the first embodiment, the coil portion  30  is formed by joining in a joint portion  90 , a first leg portion  71  and a second leg portion  81 , described below, of the segment conductors  40 . 
     The coil portion  30  is configured as a wave winding coil, for example. Moreover, the coil portion  30  is configured as a coil of eight turns. That is, the coil portion  30  is configured so that eight segment conductors  40  are disposed in parallel in the slot  12  in the radial direction. 
     &lt;Configuration of Wiring Connection of Coil Portion&gt; 
     As shown in  FIG. 6 , the coil portion  30  is configured to generate magnetic flux by being supplied with three-phase alternating current power from a power supply unit (not shown). Specifically, the coil portions  30  are connected (wired) by three-phase Y-connection. That is, the coil portion  30  includes a U-phase coil portion  30 U, a V-phase coil portion  30 V, and a W-phase coil portion  30 W. The coil portion  30  is provided with a plurality of (for example, two) neutral points N. Specifically, the coil portion  30  is connected in four parallel lines (star connection). That is, the U-phase coil portion  30 U is provided with four neutral point connection end portions NtU and four power line connection end portions PtU. The V-phase coil portion  30 V is provided with four neutral point connection end portions NtV and four power line connection end portions PtV. The W-phase coil portion  30 W is provided with four neutral point connection end portions NtW and four power line connection end portions PtW. In the following description, when the U-phase, the V-phase, and the W-phase are not particularly distinguished for the neutral point connecting end portion and the power line connecting end portion, the neutral point connecting end portion and the power line connecting end portion are simply indicated as a “neutral point connecting end portion Nt” and a “power line connection end portion Pt”. 
     &lt;Configuration of Coil Assembly&gt; 
     As shown in  FIG. 3 , the first coil assembly  30   a  includes a plurality of first segment conductors  70  (hereinafter, referred to as “first conductors  70 ”) as the segment conductors  40 . It is preferable that the first coil assembly  30   a  be configured by combining only the first conductors  70 . 
     As shown in  FIG. 7 , the second coil assembly  30   b  includes a plurality of (for example, three) power segment conductors  50  (hereinafter, referred to as “power conductors  50 ”) as the segment conductors  40 , and a plurality of (for example, two) neutral-point segment conductors  60  (hereinafter referred to as “neutral-point conductors  60 ”) as the segment conductors  40 , and second segment conductors  80  (hereinafter, referred to as “second conductors  80 ”) that are conductors (general segment conductors  40 ) different from the power conductors  50  and the neutral-point conductors  60  among the segment conductors  40  and that configure the coil portion  30 . That is, all of the power conductors  50  and the neutral point conductors  60  provided in the stator  100  are provided in the second coil assembly  30   b.  The power conductors  50  and the neutral point conductors  60  are examples of a “second segment conductor” in the claims. The first conductors  70  are an example of a “first segment conductor” in the claims. The second conductors  80  are an example of the “second segment conductor” in the claims. 
     (Configuration of Segment Conductor) 
     As shown in  FIG. 8 , the segment conductor  40  is configured as a flat conductor wire having a substantially rectangular cross section. An insulating coating  40   a  having a thickness t 1  is provided on a conductor surface  40   b  of the segment conductor  40 . The thickness t 1  of the insulating coating  40   a  is set, for example, to such an extent that interphase insulating performance (insulation between the first coil end portions  72  and insulation between the second coil end portions  82  (see  FIG. 2 )) can be ensured. Note that, in  FIG. 8 , the size relationship such as the thickness is highlighted for the sake of explanation, and the present disclosure is not limited to this example indicated in the drawing. 
     &lt;Structure of First Conductor and Second Conductor&gt; 
     As shown in  FIGS. 9 and 10 , the segment conductors  40  include the first conductors  70  disposed on one axial side (Z 2  direction side) of the stator core  10  and the second conductors  80  that are disposed on the other axial side (Z 1  direction side) of the stator core  10  and that face the first conductors  70  in the central axis direction. That is, the coil portion  30  is formed by joining the first conductors  70  and the second conductors  80 , which are divided into two in the axial direction. Here, the second conductors  80  are the segment conductors  40  other than the power conductors  50  and the neutral point conductors  60  among the segment conductors  40  that configure the second coil assembly  30   b.  In the first embodiment, each first conductor  70  includes the first leg portion  71  which has a first length L 1  in an axial direction. Each second conductor  80  include the second leg portion  81  that is disposed on the Z 1  direction side of the first leg portion  71  and that has a second length L 2  that is greater than the first length L 1  in the axial direction. 
     In the first embodiment, as shown in  FIG. 9 , the first conductors  70  are formed so as to have a U-shape (substantially U-shape) when viewed in the radial direction by connecting a pair of the first leg portions  71  in which the first leg portions  71  are disposed in the slots  12  different from each other. The coil pitch of the first conductors  70  is six. That is, the first leg portions  71  of the pair of first leg portions  71  are disposed at positions different in the circumferential direction by six slots  12 . That is, five slots  12  are provided between the slot  12  in which one first leg portion  71  of the pair of first leg portions  71  is disposed and the slot  12  in which the other first leg portion  71  of the pair of first leg portions  71  is disposed. Specifically, each first conductor  70  includes the pair of the first leg portions  71  that are disposed in different slots  12  and that are each linearly formed along the axial direction, and a first coil end portion  72 . The first leg portion  71  means a portion disposed in the slot  12  from the axial position of the end surface  10   a  (see  FIG. 2 ) of the stator core  10 . The first coil end portion  72  means a portion that is formed to be continuous with the first leg portion  71  and that is disposed on the outer axial side of the end surface  10   a  of the stator core  10 . The first coil end portion  72  has a bent shape that bends in the axial direction. Further, the first coil end portion  72  has a first crank part  73  formed in a crank shape in which the first crank part  73  is bent in a stepwise manner by the width of one segment conductor  40  in the radial direction when viewed in the axial direction. That is, the radial width of the first crank part  73  is twice the width of one segment conductor  40 . 
     Further, the axial lengths L 1  of the pair of first leg portions  71  are substantially equal to each other. The axial length L 1  of the first leg portions  71  means the length from the most distal end of the first leg portion  71  to the bent part connected to the first coil end portion  72 . The axial length L 1  is smaller than an axial length L 3  of the stator core  10  (see  FIG. 2 ). The axial length L 3  of the stator core  10  means the distance (interval) between the end surface  10   a  and the end surface  10   b  in the axial direction. 
     Similarly, as shown in  FIG. 10 , the second conductor  80  includes the pair of second leg portions  81  disposed in the slot  12  and the second coil end portion  82 . The second coil end portion  82  also has a second crank part  83 . In the first embodiment, the second conductor  80  is formed to have a U-shape by connecting the pair of second leg portions  81 , which is disposed in the different slots  12 , to each other. The axial lengths L 2  of the pair of second leg portions  81  of the second conductor  80  are substantially equal to each other. Further, the axial length L 2  of the pair of second leg portions  81  of the second conductor  80  is larger than the axial length L 1  of the pair of first leg portions  71  of the first conductor  70  (L 2 &gt;L 1 ). The axial length L 2  of the second leg portions  81  means the length from the most distal end of the second leg portions  81  to the bent part connected to the second coil end portion  82 . 
     &lt;Configuration of Power Conductor&gt; 
     As shown in  FIG. 11 , in the power conductor  50 , a plurality (for example, four) of the power line connection end portions Pt of the same phase are electrically connected to each other, and a plurality of the connected power line connection end portions Pt and one power terminal member  51  are electrically connected. In the power conductor  50 , the second leg portion  81  joined to one of the pair of first leg portions  71  (see  FIG. 14 ) and the power terminal member  51  are joined. The power conductor  50  has a function of introducing electric power into the coil portion  30  from the power supply unit (not shown). 
     Specifically, the power conductor  50  includes an outer radial side power conductor  52  that is disposed on the outer radial side of the slot  12  (see  FIG. 1 ) and that has the power line connection end portion Pt, and an inner radial side power conductor  53  that is disposed on the inner radial side and the outer axial side of the outer radial side power conductor  52  and that has the power line connection end portion Pt. In other words, the power conductor  50  is formed in a bifurcated shape. 
     The outer radial side power conductor  52  and the power terminal member  51  are electrically connected by a lead wire  54 . The inner radial side power conductor  53  and the power terminal member  51  are electrically connected to each other by the lead wire  54 . The outer radial side power conductor  52  and the inner radial side power conductor  53  are electrically connected via the power terminal member  51  and the lead wire  54 . The lead wire  54  is formed of a stranded wire (conductor) and an insulating tube  51   a  is disposed on the outer circumference, for example. 
     The outer radial side power conductor  52  and the inner radial side power conductor  53  are each provided with the second leg portion  81  but are not provided with the first coil end portion  72  or the second coil end portion  82 . Further, in the outer radial side power conductor  52  and the inner radial side power conductor  53 , the lead wire  54  and the second leg portion  81  are joined via a conductor plate  55 . For example, the joining is performed by brazing or welding (for example, any one of resistance welding, arc welding, laser welding, or high energy beam welding). 
     &lt;Structure of Neutral Point Conductor&gt; 
     As shown in  FIG. 1 , the neutral point conductor  60  includes an outer radial side neutral point conductor  61  and an inner radial side neutral point conductor  62 . As shown in  FIG. 6 , the outer radial side neutral point conductor  61  and the inner radial side neutral point conductor  62  each include the neutral point N, and the neutral point connecting end portion NtU of the U-phase coil portion  30 U, the neutral point connection end portion NtV of the V-phase coil portion  30 V, and the neutral point connection end portion NtW of the W-phase coil portion  30 W are electrically connected. 
     As shown in  FIG. 12 , each outer radial side neutral point conductor  61  includes two U-phase W-phase neutral point segment conductors  61   a  and two V-phase neutral point segment conductors  61   b.  The U-phase W-phase neutral point segment conductors  61   a  include the U-phase second leg portions  81  connected to the first leg portions  71  of the first conductors  70  for the U-phase among the three-phase alternating current, the W-phase second leg portions  81  connected to the W-phase first leg portions  71 , and two neutral point coil end portions  61   c  that each connect the U-phase second leg portion  81  and the W-phase second leg portion  81 . The neutral point coil end portion  61   c  is formed to be continuous with the U-phase second leg portion  81  and is formed to be continuous with the W-phase second leg portion  81 . 
     The U-phase W-phase neutral point segment conductor  61   a  is formed to have a substantially U-shape (substantially U-shape) when viewed from the inner radial side. The V-phase neutral point segment conductor  61   b  is formed in a substantially linear shape when viewed from the inner radial side. 
     As shown in  FIG. 1 , the neutral point coil end portion  61   c  is formed along the circumferential direction on the outer radial side of the second coil end portion  82  of the second conductor  80 . The neutral point coil end portion  61   c  is formed in a substantially arc shape when viewed in the arrow Z 2  direction. One of the two U-phase W-phase neutral point segment conductors  61   a  is disposed on the other outer axial side (arrow Z 1  direction side). 
     As shown in  FIG. 12 , the V-phase neutral point segment conductor  61   b  includes a V-phase second leg portion  81  connected to the V-phase first conductor  70  and a neutral point coil end portion  61   d.  The neutral point coil end portion  61   d  is formed so as to protrude from the second leg portion  81  in the outer axial direction (in the arrow Z 1  direction). The two neutral point coil end portions  61   d  are electrically joined to each other by being joined to both of the two neutral point coil end portions  61   c.    
     As shown in  FIG. 13 , the inner radial side neutral point conductor  62  includes two U-phase W-phase neutral point segment conductors  62   a  and two V-phase neutral point segment conductors  62   b.  The U-phase W-phase neutral point segment conductors  62   a  include the U-phase second leg portions  81  connected to the first leg portions  71  of the first conductors  70  for the U-phase among the three-phase alternating current, the W-phase second leg portions  81  connected to the W-phase first conductor  70 , and the neutral point coil end portions  62   c  that each connect the U-phase second leg portion  81  and the W-phase second leg portion  81 . The neutral point coil end portions  62   c  are formed to be continuous with the U-phase second leg portions  81  and to be continuous with the W-phase second leg portion  81 . As a result, the U-phase W-phase neutral point segment conductors  62   a  are formed in a substantially U-shape (substantially U-shape) when viewed from the inner radial side. The V-phase neutral point segment conductors  62   b  are formed in a substantially linear shape when viewed from the inner radial side. 
     As shown in  FIG. 14 , the neutral point coil end portion  62   c  is formed so as to protrude axially outward with respect to the second coil end portion  82  of the second conductor  80 . The neutral-point coil end portion  62   c  is disposed close to the outer axial side of the second coil end portion  82  of the second conductor  80 , and is formed along the circumferential direction when viewed in the axial direction. One of the two U-phase W-phase neutral point segment conductors  62   a  is disposed on outer radial side of the other U-phase W-phase neutral point segment conductor  62   a.    
     The V-phase neutral point segment conductor  62   b  includes the V-phase second leg portion  81  connected to the first leg portion  71  of the V-phase first conductor  70 , and a neutral point coil end portion  62   d.  The neutral point coil end portion  62   d  is formed so as to protrude from the second leg portion  81  in the outer axial direction (in the direction of the arrow Z 1 ). The two neutral point coil end portions  62   d  are electrically joined by being joined to both of the two neutral point coil end portions  62   c.    
     (Structure of Joint Portion) 
     As shown in  FIG. 14 , the plurality of first conductors  70  and the plurality of second conductors  80  are joined in one slot  12 . Further, in the first embodiment, the axial length L 2  of the pair of second leg portions  81  of the second conductor  80  is larger than the axial length L 1  of the pair of first leg portions  71  of the first conductor  70  (L 2 &gt;L 1 ). Thus, the joining portion  90  in which the first conductor  70  and the second conductor  80  are joined is disposed in the slot  12 , on one end portion side (near the end surface  10   a ) of the axial center of the stator core  10 . Further, in all the slots  12  of the stator core  10 , the joint portion  90  is provided in the vicinity of the end surface  10   a  on one axial side. Here, the vicinity of the end surface  10   a  includes, in the axial direction, the position that is on the Z 2  direction side of the axial center C 2  and that is the same position as the end surface  10   a,  and the range within the substantially insulating creepage distance in the Z 1  direction or the Z 2  direction from the end surface  10   a,  for example. 
     Further, in the first embodiment, the plurality of first leg portions  71  are provided in one slot  12  so as to be adjacent to each other in the radial direction of the stator core  10 . That is, the joint portions  90  of the first leg portions  71  and the second leg portions  81  are disposed adjacent to each other in the radial direction in one slot  12 . 
     &lt;Configuration of Inclined Surface&gt; 
     As shown in  FIG. 15 , the first conductor  70  of the plurality of segment conductors  40  is provided with a first facing surface  74 , which is inclined with respect to a plane orthogonal to the axial direction, at the tip of the first leg portion  71 . In addition, the second conductor  80  is provided with a second facing surface  84 , which is inclined with respect to the plane orthogonal to the axial direction, at the tip of the second leg portion  81 . The joining portion  90  is formed by joining the first facing surface  74  and the second facing surface  84 , which face each other in the radial direction, of the first conductor  70  and the second conductor  80  which face each other in the axial direction. That is, the joint portion  90  means a portion in which the first conductor  70  and the second conductor  80  are joined. 
     Specifically, the first leg portion  71  includes the first facing surface  74  that faces the second leg portion  81  and that also faces the inner radial side (arrow R 1  direction side). In addition, the second leg portion  81  includes the second facing surface  84  that faces the first facing surface  74  and that also faces the outer radial side (arrow R 2  direction side). The first conductor  70  and the second conductor  80  are joined by joining the first facing surface  74  of the first leg portion  71  and the second facing surface  84  of the second leg portion  81 . 
     Further, the first facing surface  74  of the first leg portion  71  and the second facing surface  84  of the second leg portion  81  are joined by a joining material (not shown), for example. The joining material joins and electrically connects the first facing surface  74  and the second facing surface  84 . Specifically, the bonding material includes a conductive material such as silver or copper. It is preferable that the joining material is a paste form joining material (silver nanopaste) that contains, as conductive particles, metal particles obtained by miniaturizing silver to a nanometer level, in a solvent. Further, the bonding material contains a member (resin member) that volatilizes when heated, and has a function of bringing the first facing surface  74  and the second facing surface  84  close to each other by heating the volatilizing member and decreasing the volume of the bonding material. 
     As shown in  FIG. 15 , in the first embodiment, the joint portions  90 , each in which the first conductor  70  and the second conductor  80  are joined, are configured so that the joint portions  90  adjacent in the radial overlap with each other when viewed in the radial direction. Specifically, the plurality of (all) joint portions  90  disposed in one slot  12  are configured to overlap with each other when viewed in the radial direction. That is, all the joint portions  90  disposed in one slot  12  are disposed in a state in which the joint portions  90  are aligned along the horizontal direction. In other words, each position of the joint portions  90  in the axial direction in one slot  12  are substantially equal to each other. The joining portion  90  is a part in which the first facing surface  74  of the first leg portion  71  and the second facing surface  84  of the second leg portion  81  are joined (overlapped) when viewed in the radial direction. 
     (Configuration of First Insulating Member) 
     As shown in  FIG. 5 , the first insulating member  20  is disposed between the wall portion  11   a  and the teeth  13  and the first leg portion  71  and the second leg portion  81  (segment conductor  40 ). As shown in  FIG. 16 , the first insulating member  20  has a three-layer configuration. Specifically, as shown in  FIG. 14 , in the first embodiment, the first insulating member  20  includes, in the slot  12 : an insulating layer  20   a  that is provided between the wall portion  11   a  of the back yoke  11  and the circumferential side surface  13   a  of the teeth  13  (see  FIG. 5 ), and the first leg portion  71  and the second leg portion  81 , and that insulates the wall portion  11   a  and the circumferential side surface  13   a  from the first leg portion  71  and the second leg portion  81 ; and a fixing layer  20   c  that is provided so as to overlap with a part  20   b  at a position (region) (P 2 ) different from the position P 1  in the axial direction corresponding to the joining portion  90  among the insulating layer  20   a  and that fixes the stator core  10  and the second leg portion  81 . The fixing layer  20   c  is preferably configured as an adhesive layer containing an adhesive. In addition, the position P 2  includes, in the axial direction, the entire region inside the slot  12  of the part excluding the axial position P 1 , and a part near the end surface  10   b  of the stator core  10  (including the part outside the slot  12  in the axial direction) for example. 
     And the first insulating member  20  is disposed so as to integrally cover the surroundings of the second leg portions  81  disposed in parallel in the radial direction when viewed in the arrow Z 2  direction. In other words, both sides in the circumferential direction and both sides in the radial direction of the second leg portions  81  disposed in parallel in the radial direction are covered by the first insulating member  20 . In this way, the first insulating member  20  can ensure the insulation between the joint portion  90  and the stator core  10 . 
     The insulating layer  20   a  is configured of a poly phenylene sulfide resin (PPS), for example. The insulating layer  20   a  may be formed in a non-woven fabric form such as aramid paper. In addition, in the first embodiment, as shown in  FIG. 14 , the insulating layer  20   a  is provided from the end surface  10   a  on one axial side of the stator core  10  across to the end surface  10   b  on the other axial side. That is, the insulating layer  20   a  is disposed so as to cover the wall portion  11   a  and the circumferential side surface  13   a  in each slot. In addition, to “cover” does not only mean to cover all parts of the wall portion  11   a  and the circumferential side surface  13   a,  but means a broad concept including a case in which the inner radial side part (distal end gap part) of the circumferential side surface  13   a  is exposed, as shown in  FIG. 5 . 
     As shown in  FIG. 16 , in the first embodiment, the fixing layer  20   c  includes a foaming agent  20   d  (expanding agent) that foams due to heat. Specifically, the fixing layer  20   c  is formed, for example, by mixing a plurality of capsule bodies as the foaming agent  20   d  with a thermosetting resin  20   e.  The foaming agent  20   d  is configured to expand the volume of the capsule body when heated to a foaming temperature T1 or higher. The thickness of the fixing layer  20   c  increases from t 2  (see  FIGS. 17 ) to t 3  (see  FIG. 18 ) by being heated in the manufacturing process of the stator  100 , for example. As a result, the fixing layer  20   c  fills the space between the second leg portion  81  and the wall portion  11   a  and the circumferential side surface  13   a  by the foaming agent  20   d  foaming (expanding) when heated. 
     Further, the thermosetting resin  20   e  is configured to be cured by being heated to a curing temperature T2 or higher which is higher than the foaming temperature T1. The thermosetting resin  20   e  forming the fixing layer  20   c  is, for example, an epoxy resin. The fixing layer  20   c  is configured so that when the fixing layer  20   c  is heated, the thermosetting resin  20   e  is cured so that the second leg portion  81  and the wall portion  11   a  and the circumferential side surface  13   a  are bonded and fixed. 
     As shown in  FIG. 14 , in the first embodiment, the fixing layer  20   c  containing the foaming agent  20   d  in the foamed state is filled between at least a part of the second leg portion  81 , and the wall portion  11   a  and the circumferential side surface  13   a  that configure the slot  12 , at the position P 2  different from the position P 1  in the axial direction corresponding to the joint portion  90 . Specifically, in the first embodiment, the fixing layer  20   c  is provided so as to overlap with the part  20   b  of the insulating layer  20   a  on the other axial side (Z 1  direction side) of the position P 1  in the axial direction corresponding to the joint portion  90 . In other words, the fixing layer  20   c  is provided so as to overlap with the part  20   b  of the insulating layer  20   a  on the other axial side of the vicinity of the end surface  10   a  on the one axial side (Z 2  direction side). Further, the fixing layer  20   c  is provided in the slot  12  so as to overlap with the part  20   b  of the insulating layer  20   a  that is disposed between the second leg portion  81  and the stator core  10 . For example, as shown in  FIG. 16 , the fixing layer  20   c  is provided so as to overlap with and sandwich the insulating layer  20   a  in the part  20   b  of the insulating layer  20   a  at a position different from the axial position corresponding to the joint portion  90 . 
     Further, in the first embodiment, as shown in  FIG. 15 , the first insulating member  20  provided between the slot  12  and the coil portion  30  and the second insulating member  21  provided separately from the first insulating member  20  are provided. As shown in  FIG. 19 , the joint portions  90  in which the first conductor  70  and the second conductor  80  are joined between the coils adjacent in the radial direction in one slot  12  are insulated by the second insulating member  21  that is provided separate from the first insulating member  20 . The term “coils adjacent in the radial direction” means a linear part of the coil portion  30  that is disposed in the slot  12  after the first conductor  70  and the second conductor  80  are joined. 
     Here, in the first embodiment, as shown in  FIG. 19 , the second insulating member  21  is formed by folding one sheet-shaped insulating member such as a Nomex. The second insulating member  21  includes: at least two or more facing surface insulating parts  21   a  that cover a facing surface  90   a  of the joint portions  90  that are adjacent in the radial direction; and a circumferential surface insulating part  21   b  that is continuous from both end portions of the facing surface insulating part  21   a  in the circumferential direction and that covers one of the circumferential surfaces  90   b  of the joint portion  90  that are adjacent in the radial direction for at least the insulation distance. The facing surface  90   a  of the joint portion  90  means an outer radial surface and an inner radial surface, which face each other, of the joint portions  90  that are radially adjacent to each other. The insulation distance means a distance (creepage distance) that is a length along the circumferential surface insulating part  21   b  in the radial direction and that is sufficient for insulating the joint portions  90 , which are adjacent to each other, from each other. The circumferential surface  90   b  means a surface of the joint portion  90  that intersects the circumferential direction. In other words, the circumferential surface  90   b  means a surface extending in the radial direction and the axial direction. The insulation distance is an example of a “predetermined distance” in the claims. 
     As shown in  FIG. 20 , the second insulating member  21  includes a part  21   c  that covers an outer radial side of the joint portion  90  disposed on the outermost radial side, and a part  21   d  that covers the inner dial side of the joint portion  90  disposed on the innermost radial side. 
     Further, in the second insulating member  21 , the facing surface insulating parts  21   a  that are adjacent in the radial direction are connected to each other by the circumferential surface insulating part  21   b  in one or the other circumferential direction. Specifically, the facing surface insulating part  21   a  on the outer radial side among the pair of facing surface insulating parts  21   a  disposed adjacent to each other in the radial direction, the circumferential surface insulating part  21   b  provided on one side in the circumferential direction, the facing surface insulating part  21   a  on the inner radial side among the pair of facing surface insulating parts  21   a,  and the circumferential surface insulating part  21   b  provided on the other side in the circumferential direction are formed to be continuous. That is, the circumferential surface  90   b  on the A 1  direction side of the joint portion  90  and the circumferential surface  90   b  on the A 2  direction side of the joint portion  90  are alternately covered by the circumferential surface insulating part  21   b.  In other words, the second insulating member  21  is configured so as not to continuously cover the circumferential surfaces  90   b  of the plurality of joint portions  90  disposed adjacent to each other in the radial direction. 
     Here, in the first embodiment, the facing surface insulating part  21   a  of the second insulating member  21  is provided so as to overlap with the entire facing surface  90   a  of the joint portion  90  when viewed in the radial direction. That is, a circumferential length L 4  (see  FIG. 19 ) of the facing surface insulating part  21   a  is larger than a circumferential length L 5  (see  FIG. 19 ) of the facing surface  90   a.    
     The circumferential surface insulating part  21   b  of the second insulating member  21  is provided so as to overlap with the circumferential surface  90   b  of the joint portion  90  when viewed from the circumferential direction. Specifically, the circumferential surface insulating part  21   b  is provided so as to overlap with the entire surface of the circumferential surface  90   b  of the joint portion  90  when viewed from the circumferential direction. Specifically, a radial length L 6  (see  FIG. 19 ) of the circumferential surface insulating part  21   b  is larger than a radial length L 7  (see  FIG. 19 ) of the circumferential surface  90   b.    
     Thus, the second insulating member  21  has a meandering shape (bellows shape) when viewed from the central axis direction. Further, all the joint portions  90  disposed in one slot  12  are insulated from each other by one second insulating member  21 . This makes it possible to reduce the number of steps for disposing the second insulating member  21  as compared to the case in which the plurality of joint portions  90  disposed in one slot  12  are individually covered by the insulating member. 
     Further, in the first embodiment, as shown in  FIG. 20 , the second insulating member  21  is configured to be expandable/contractible along the radial direction. The second insulating member  21  is made of a flexible sheet-shaped insulating member, and is configured to not continuously cover the circumferential surfaces  90   b  of the plurality of joint portions  90  disposed adjacent to each other in the radial direction. Thus, even when the first leg portion  71  and the second leg portion  81  are pressed in the radial direction or the axial direction when the first leg portion  71  and the second leg portion  81  are joined, the second insulating member  21  can be deformed with the movement of the first leg portion  71  and the second leg portion  81 . 
     Further, as shown in  FIG. 15 , the second insulating member  21  is disposed so that an edge portion on one axial side protrudes outward from the end surface  10   a  of the stator core  10  in the central axis direction. Specifically, in the central axis direction, the Z 2  direction side of the second insulating member  21  protrudes outward from the end surface  10   a  of the stator core  10 , and the Z 1  direction side is disposed in the slot  12 . 
     Further, as shown in  FIG. 15 , the first insulating member  20  is also disposed together with the second insulating member  21  so as to protrude outward from the end surface  10   a  of the stator core  10  in the central axis direction. A height position h 1  of the part of the second insulating member  21  protruding outward from the end surface  10   a  of the stator core  10  and a height position h 2  of the part of the first insulating member  20  protruding outward from the end surface  10   a  of the stator core  10  are substantially equal. The protruding amount of the first insulating member  20  and the second insulating member  21  from the end surface  10   a  of the stator core  10  is adjusted to a degree in which the first insulating member  20  and the second insulating member  21  are not bent by coming into contact with the second coil end portion  82  of the second segment conductor  80 . 
     Further, as shown in  FIG. 3 , a length L 12  of the second insulating member  21  is smaller than a length L 11  of the first insulating member  20  in the central axis direction. Specifically, the length L 11  of the first insulating member  20  is larger than the length L 3  of the stator core  10  in the central axis direction. The length L 12  of the second insulating member  21  is smaller than the length L 3  of the stator core  10 . The second insulating member  21  is provided so as to cover the joint portion  90  and extend from the joint portion  90  toward the Z 1  direction side and the Z 2  direction side. The length L 12  of the second insulating member  21  is adjusted based on the magnitude of the voltage applied to the coil portion  30  (based on the required creepage distance). 
     Further, since the length L 12  of the second insulating member  21  is smaller than the length L 11  of the first insulating member  20 , as shown in  FIG. 21 , the first insulating member  20  has a part  20   f  that overlaps with the second insulating member  21  and the part  20   b  that does not overlap with the second insulating member  21  when viewed in the radial direction. Specifically, the first insulating member  20  overlaps with the second insulating member  21  in the vicinity of the end portion (end surface  10   a ) in the central axis direction in the slot  12 . A thickness t 11  of the part  20   f  of the first insulating member  20  that overlaps with the second insulating member  21  is smaller than a thickness t 12  of the part  20   b  of the first insulating member  20  that does not overlap with the second insulating member  21 . 
     A thickness t 13  of the second insulating member  21  is smaller than the thickness t 11 . Further, the thickness t 12  is obtained by adding the thickness t 11  to the thickness t 3  of two sheets (t 3 ×2) of the fixing layer  20   c.    
     Further, in the first embodiment, the second insulating member  21  is disposed on one axial side (Z 2  direction side) with respect to the fixing layer  20   c  of the first insulating member  20  and between the joint portions  90  in the radial direction, and is configured to insulate the joint portions  90  from each other. Specifically, the fixing layer  20   c  is provided so as to overlap with the part  20   b  of the insulating layer  20   a  that does not overlap with the second insulating member  21  in the radial direction. Further, the insulating layer  20   a  is disposed in the part  20   f  that overlaps with the second insulating member  21  when viewed in the radial direction. 
     Second Embodiment 
     Next, with reference to  FIG. 4  and  FIGS. 22 to 31 , a stator  200  according to a second embodiment will be described. In the stator  200  of the second embodiment, insulating members ( 121 ,  122 ) that are integrally formed are provided, unlike the stator  100  of the first embodiment that has the first insulating member  20  and the second insulating member  21  that are provided separately from each other. The same configurations as those in the first embodiment are indicated by the same reference numerals as those in the first embodiment and are shown in the drawings, and the description thereof will be omitted. 
     Structure of Stator 
     The structure of the stator  200  according to the second embodiment will be described with reference to  FIG. 4  and  FIGS. 22 to 31 . The stator  200  is an example of the “armature” in the claims. 
     As shown in  FIG. 22 , the stator  200  includes the sheet-shaped insulating member  121  and a coil portion  130 . The coil portion  130  also includes a first coil assembly  130   a  (non-lead side coil) and a second coil assembly  130   b  (lead side coil). Further, the coil portion  130  is composed of a plurality of segment conductors  140  (see  FIGS. 24A and 24B ). The insulating member  121  is an example of a “joint portion insulating member” in the claims. 
     In addition, as shown in  FIG. 23 , in the central axis direction, the insulating member  121  (contact portion insulating part  121   c  described below) and the core leg portion insulating part  122  described below each have the same length L 22 . The length L 22  is larger than the length L 3  of the stator core  10  in the central axis direction. Note that, in  FIG. 23 , the illustration of the first conductor  70  and the second conductor  80  is omitted for simplification. In addition, in  FIG. 23 , each shape of the insulating member  121  and the core leg portion insulating part  122  are schematically illustrated. 
     (Configuration of Segment Conductor) 
     As shown in  FIGS. 24A and 24B , the segment conductor  140  is configured as a flat conductor wire having a substantially rectangular cross section. In the segment conductor  140 , a first leg portion  171  (second leg portion  181 ), which will be described below, is not covered with the insulating coating and a conductor surface  140   b  is exposed (see  FIG. 24A ). In contrast, in the segment conductor  140 , an insulating coating  140   a  (see  FIG. 24B ) having a thickness t 21  is provided on the conductor surface  140   b  of a first coil end portion  172  (second coil end portion  182 ) described below. For example, the thickness t 21  of the insulating coating  140   a  is set to ensure an interphase insulating performance (insulation between the first coil end portions  172  and insulation between the second coil end portions  182  (see  FIGS. 25A  and B, and  FIGS. 26A  and B)). In  FIGS. 24A and 24B , for the sake of explanation, the magnitude relationship such as the thickness is emphasized. However, the present disclosure is not limited to this illustrated example. In  FIGS. 24A and 24B , only the first conductor  170  described below is shown. However, the second conductor  180  is similar, illustration thereof is omitted. The conductor surface  140   b  is an example of a “metal surface” in the claims. 
     &lt;Structure of First Conductor and Second Conductor&gt; 
     As shown in  FIGS. 25A (B) and  26 A(B), the plurality of segment conductors  140  includes a plurality of first conductors  170  disposed on one axial side (Z 2  direction side) of the stator core  10  and a plurality of second conductors  180  disposed on the other axial side (Z 1  direction side) of the stator core  10 . The first conductor  170  and the second conductor  180  are disposed facing each other in the central axis direction. The first conductor  170  also includes the first leg portion  171  having a length L 31  in the axial direction. The first leg portion  171  extends to the other side (Z 1  direction side) in the central axis direction. The second conductor  180  also includes the second leg portion  181  having a length L 32  in the axial direction. The second leg portion  181  extends to one side (Z 2  direction side) in the central axis direction. The length L 31  of the first leg portion  171  and the length L 32  of the second leg portion  181  are substantially the same. Further, each of the first leg portion  171  and the second leg portion  181  is inserted in the slot  12 . The first conductor  170  and the second conductor  180  are examples of the “first segment conductor” and the “second segment conductor” in the claims, respectively. 
     As shown in  FIGS. 25A and 25B , the plurality of first conductors  170  is formed to have a U-shape (substantially U-shape) when viewed in the radial direction by connecting a pair of the first leg portions  171 , which are disposed in different slots  12 , to each other. The coil pitch of the first conductor  170  is six. That is, the first leg portions  171  are disposed at positions different in the circumferential direction by six slots  12 . That is, five slots  12  are provided between the slot  12  in which one first leg portion  171  of the pair of first leg portions  171  is disposed and the slot  12  in which the other first leg portion  171  is disposed. Specifically, the first conductor  170  includes the pair of first leg portions  171 , which are each disposed in different slots  12  and which are linearly formed along the axial direction, and the first coil end portion  172 . The first leg portion  171  means a part disposed in the slot  12  from the axial position of the end surface  10   a  (see  FIG. 2 ) in the central axis direction of the stator core  10 , and the first coil end portion  172  means a part that is formed to be continuous with the first leg portion  171  and that is disposed on the outer axial side of the end surface  10   a  of the stator core  10 . The first coil end portion  172  has a bent shape that bends in the axial direction. Further, the first coil end portion  172  has a first crank part  173  formed in a crank shape that is bent in a stepwise shape for a width of one segment conductor  140  in the radial direction when viewed in the axial direction. That is, the radial width of the first crank part  173  is twice the width of one segment conductor  140 . 
     Further, the axial lengths L 31  of the pair of first leg portions  171  are substantially equal to each other. An axial length L 31  means the length of the part of the first conductor  170  that extends linearly in the central axis direction within the slot  12 . The axial length L 31  is smaller than the central axis direction length L 3  (see  FIG. 23 ) of the stator core  10  (slot  12 ). 
     Similarly, as shown in  FIGS. 26A and 26B , the second conductor  180  includes a pair of the second leg portions  181  disposed in the slot  12  and the second coil end portion  182 . Also, the second coil end portion  182  has a second crank part  183 . The second conductor  180  is formed to have a U-shape by connecting the pair of second leg portions  181 , which are disposed in different slots  12 , to each other. The axial lengths L 32  of the pair of second leg portions  181  of the second conductor  180  are substantially equal to each other. The axial length L 32  means the length of the part of the second conductor  180  that extends linearly in the central axis direction within the slot  12 . 
     As shown in  FIG. 27 , the plurality of first leg portions  171  are provided in each of the plurality of slots  12  so that the first leg portions  171  are adjacent to each other in the radial direction of the stator core  10 . In addition, the plurality of second leg portions  181  are provided in each of the plurality of slots  12  so that the second leg portions  181  are adjacent to each other in the radial direction of the stator core  10 . 
     Further, in one slot  12 , a plurality of first surfaces  171   a  provided on the first leg portions  171  and the second surfaces  181   a  provided on the second leg portions  181  are disposed alternately along the radial direction. Each first surface  171   a  is provided on a distal end portion  171   b  side of the first leg portion  171 . Each second surface  181   a  is provided on a distal end portion  181   b  side of the second leg portion  181 . The first surface  171   a  and the second surface  181   a  are provided so as to be in contact with each other as described below, and the first surface  171   a  and the second surface  181   a  that are in contact with each other are disposed so as to face each other in the radial direction. 
     Further, the stator  200  includes a spring member  210  that is provided in each of the plurality of slots  12  so as to be sandwiched between the coil portion  130  and the opening portion  12   a  (protruding portion  13   b ) of the slot  12 . That is, the spring member  210  is provided in a distal end clearance  12   b  provided inside the slot  12  in the radial direction. 
     The spring member  210  is configured to press the coil portion  130  from the inner radial side of the coil portion  130  in the radial direction so that the first surface  171   a  of the first leg portion  171  of the first conductor  170  and the second surface  181   a  of the second leg portion  181  of the second conductor  180  are in contact with each other. A contact portion  190  is formed by contact between the first surface  171   a  of the first leg portion  171  and the second surface  181   a  of the second leg portion  181 . The contact portion  190  is an example of a “joint portion” in the claims. 
     The first surface  171   a  and the second surface  181   a  are in contact with each other by being pressed by the spring member  210  without a bonding agent being interposed between the first surface  171   a  and the second surface  181   a.  That is, the first surface  171   a  and the second surface  181   a  are not joined, and the contact state between the first surface  171   a  and the second surface  181   a  is maintained by the pressing force of the spring member  210 . 
     In addition, a plurality of sets (eight in the second embodiment) of the first surface  171   a  and the second surface  181   a  that are in contact with each other are provided in one slot  12 . That is, a plurality of the contact portions  190  is provided in one slot  12 . 
     The contact portions  190  are disposed adjacent to each other in the radial direction within one slot  12 . 
     In addition, a plurality of sets (eight in the second embodiment) of the first surface  171   a  and the second surface  181   a  that are in contact with each other are provided in one slot  12 . That is, a plurality of the contact portions  190  is provided in one slot  12 . The contact portions  190  are disposed adjacent to each other in the radial direction within one slot  12 . 
     Here, in the second embodiment, each of the plurality of contact portions  190  is disposed within the slot  12 , in a central portion in the central axis direction of the stator core  10 . The spring member  210  is also disposed in the central portion of the stator core  10  in the central axis direction. Specifically, the spring member  210  is provided so as to overlap with each of the plurality of contact portions  190  when viewed in the radial direction. 
     Further, each of the first surface  171   a  and the second surface  181   a  is plated. That is, the plated surfaces (the first surface  171   a  and the second surface  181   a ) are in contact with each other. 
     In the plating process, metals such as nickel (Ni), silver (Ag), gold (Au), and tin (Sn) are used. The plating process may be performed using a plurality of metals (for example, Ni and Ag) among the above metals. 
     As shown in  FIG. 28 , the first leg portion  171  includes a first surface forming portion  171   c  in which the first surface  171   a  is formed. The first surface forming portion  171   c  (first surface  171   a ) is provided so as to extend along the central axis direction. In addition, the first leg portion  171  includes a first leg body portion  171   d  that is provided on one side (Z 2  direction side) in the central axis direction of the first surface forming portion  171   c  so as to be continuous from the first surface forming portion  171   c.  The first surface forming portion  171   c  has a radial thickness t 31 . The first leg body portion  171   d  has a radial thickness t 32 . The radial thickness t 32  of the first leg body portion  171   d  is greater than the radial thickness t 31  of the first surface forming portion  171   c.    
     Further, the first leg portion  171  includes a first step portion  171   e  provided between the first surface forming portion  171   c  and the first leg body portion  171   d.  A clearance portion  171   f  is provided between the first step portion  171   e  and the distal end portion  181   b  of the second leg portion  181 . 
     The second leg portion  181  includes a second surface forming portion  181   c  in which the second surface  181   a  is formed. The second surface forming portion  181   c  (second surface  181   a ) is provided so as to extend along the central axis direction. In addition, the second leg portion  181  includes a second leg body portion  181   d  that is provided on the other side (Z 1  direction side) in the central axis direction of the second surface forming portion  181   c  so as to be continuous from the second surface forming portion  181   c.  The second surface forming portion  181   c  has a radial thickness t 33 . The second leg body portion  181   d  has a radial thickness t 34 . The radial thickness t 34  of the second leg body portion  181   d  is greater than the radial thickness t 33  of the second surface forming portion  181   c.    
     The second leg portion  181  includes a second step portion  181   e  provided between the second surface forming portion  181   c  and the second leg portion main body portion  181   d.  A clearance portion  181   f  is provided between the second step portion  181   e  and the distal end portion  171   b  of the first leg portion  171 . 
     The radial thickness t 31  of the first surface forming portion  171   c  and the radial thickness t 33  of the second surface forming portion  181   c  are substantially equal. The radial thickness t 32  of the first leg body portion  171   d  and the radial thickness t 34  of the second leg body portion  181   d  are substantially equal. Note that, in  FIG. 28 , in order to highlight the insulating member  121 , the insulating member  121  is illustrated so as to have a thickness greater than the actual thickness. 
     Here, in the second embodiment, as shown in  FIG. 29 , between the coils adjacent to each other in the radial direction in one slot  12 , the sheet-shaped insulating member  121  is provided so as to insulate the contact portions  190  from each other. Here, in each contact portion  190 , the first leg portion  171  in which the conductor surface  140   b  is exposed and the second leg portion  181  in which the conductor surface  140   b  (see  FIGS. 24A and 24B ) is exposed are in contact without a bonding agent being interposed therebetween. Specifically, the insulating member  121  is provided between each of the plurality of (eight in the second embodiment) coils (a set of the first leg portion  171  and the second leg portion  181  that are in contact with each other) disposed in the radial direction in the slot  12 . 
     Specifically, the insulating member  121  is formed by folding one sheet-shaped insulating member such as a Nomex. The insulating member  121  includes: facing surface insulating parts  121   a  that cover facing surfaces  190   a  of the contact portions  190  that are adjacent in the radial direction; and a circumferential surface insulating part  121   b  that is continuous from both end portions of the facing surface insulating part  121   a  in the circumferential direction and that covers one of the circumferential surfaces  190   b  of the contact portions  190  that are adjacent in the radial direction for at least the insulation distance. The facing surfaces  190   a  of the contact portions  190  mean an outer radial surface and an inner radial surface of the contact portions  190 , which face each other in the radial direction. Further, the insulation distance is a length along the radial direction of the circumferential surface insulating part  121   b  and means a distance (creepage distance) sufficient for insulating the contact portions  190  adjacent to each other in the radial direction. The circumferential surfaces  190   b  mean surfaces of the contact portions  190  that intersect with the circumferential direction. In other words, the circumferential surfaces  190   b  mean surfaces extending in the radial direction and the axial direction. 
     In addition, the insulating member  121  includes the contact portion insulating parts  121   c  that are formed so that the following are continuous: the facing surface insulating part  121   a  on the outer radial side among a pair of the facing surface insulating parts  121   a  disposed adjacent to each other in the radial direction; the circumferential surface insulating part  121   b  provided on one side in the circumferential direction; the facing surface insulating part  121   a  on the inner radial side among the pair of the facing surface insulating parts  121   a;  and the circumferential surface insulating part  121   b  provided on the other side in the circumferential direction. The contact portion insulating part  121   c  is an example of the “joint portion insulating part” in the claims. 
     Here, in the second embodiment, the stator  200  includes the core leg portion insulating part  122  that is provided between the slot  12  and the coil portion  130  and that is integrally formed with the contact portion insulating part  121   c.  That is, the core leg portion insulating part  122  has a sheet shape similar to the contact portion insulating part  121   c  and is made of the same material as the contact portion insulating part  121   c.  Further, the contact portion insulating part  121   c  and the core leg portion insulating part  122  have the same thickness (not shown). The contact portion insulating part  121   c  and the core leg portion insulating part  122  have the same length L 22  (see  FIG. 27 ) in the central axis direction. 
     Specifically, the core leg portion insulating part  122  has the one side insulating part  122   a  that is continuous with the facing surface insulating part  121   a  on the outermost radial side and that is provided, on one side of the slot  12  in the circumferential direction (left side in  FIG. 29 ), between the slot  12  (circumferential side surface  13   a ) and the coil portion  130  (circumferential surface  190   b ). Further, the core leg portion insulating part  122  has the other side insulating part  122   b  that is continuous with the facing surface insulating part  121   a  on the innermost radial side and that is provided, on the other side of the slot  12  in the circumferential direction (right side in  FIG. 29 ), between the slot  12  (circumferential side surface  13   a ) and the coil portion  130  (circumferential surface  190   b ). 
     More specifically, in the one side insulating part  122   a  (other side insulating part  122   b ), the following parts are alternated along the radial direction: the part the is sandwiched between the circumferential side surface  13   a  of the slot  12  and the circumferential surface  190   b  of the coil portion  130 ; and the part sandwiched between the circumferential side surface  13   a  of the slot  12  and the circumferential surface insulating part  121   b  that covers the circumferential surface  190   b  of the coil portion  130 . 
     Further, in the second embodiment, the one side insulating part  122   a  extends from an outer radial side end portion  230   a  of the coil portion  130  in the slot  12  to an inner radial side end portion  230   b  (so as to extend over the end portion  230   b ). The other side insulating part  122   b  extends from the inner radial side end portion  230   b  of the coil portion  130  in the slot  12  to the outer radial side end portion  230   a  (so as to extend over the end portion  230   a ). That is, the coil portion  130  in the slot  12  is provided so as to be surrounded by the facing surface insulating part  121   a  on the outermost radial side, the facing surface insulating part  121   a  on the innermost radial side, the one side insulating part  122   a,  and the other side insulating part  122   b.    
     The core leg portion insulating part  122  includes an inner radial side insulating part  122   c  that is continuous with the one side insulating part  122   a  and that is provided so as to cover the facing surface insulating part  121   a  on the innermost radial side from the inner radial side. Further, the core leg portion insulating part  122  has an outer radial side insulating part  122   d  that is continuous with the other side insulating part  122   b  and that is provided so as to cover the facing surface insulating part  121   a  on the outermost radial side from the outer radial side. 
     Specifically, the inner radial side insulating part  122   c  is provided so as to be sandwiched between the facing surface insulating part  121   a  on the innermost radial side and the spring member  210 . That is, the coil portion  130  and the spring member  210  are insulated from each other by the facing surface insulating part  121   a  on the innermost radial side and the inner radial side insulating part  122   c.  The outer radial side insulating part  122   d  is provided so as to be sandwiched between the facing surface insulating part  121   a  on the outermost radial side and the wall portion  11   a  of the slot  12 . That is, the coil portion  130  and the wall portion  11   a  (stator core  10 ) of the slot  12  are insulated from each other by the facing surface insulating part  121   a  on the outermost radial side and the outer radial side insulating part  122   d.    
     Further, the inner radial side insulating part  122   c  has a length L 41  in the circumferential direction. Further, the outer radial side insulating part  122   d  has a length L 42  in the circumferential direction. Each of the length L 41  of the inner radial side insulating part  122   c  and the length L 42  of the outer radial side insulating part  122   d  is greater than half the width W 2  of the slot  12  (see  FIG. 4 ), for example. 
     In the second embodiment, as shown in  FIG. 27 , the length L 22  of each of the contact portion insulating part  121   c  (see  FIG. 29 ) and the core leg portion insulating part (see  FIG. 29 ) in the central axis direction is greater than a length L 62  of the slot  12  in the central axis direction. The length L 62  of the slot  12  in the central axis direction is equal to the length L 3  of the stator core  10  in the central axis direction (see  FIG. 22 ). In addition, each of the contact portion insulating part  121   c  and the core leg portion insulating part  122  is disposed so that edge portions on both sides in the central axis direction protrude outward from the end surfaces ( 10   a,    10   b ) of the stator core  10  in the central axis direction. As a result, each of the contact portion insulating part  121   c  and the core leg portion insulating part  122  is provided across the entire slot  12 , in the central axis direction. 
     Further, as shown in  FIG. 30 , the contact portion insulating part  121   c  includes an insulating layer  123   a  and a fixing layer  123   b  that includes a foaming agent  123   c  that foams due to heat. The foaming agent  123   c  foams and expands so as to fix a coil (a pair of the first leg portion  171  and the second leg portion  181  that are in contact with each other) in at least the central axis direction with respect to a coil adjacent in the circumferential direction. The fixing layer  123   b  is provided on both surfaces of the insulating layer  123   a.  When the fixing layer  123   b  is heated, a thermosetting resin  123   d  is cured. As a result, the fixing layer  123   b  of the contact portion insulating part  121   c  bonds the adjacent coils to each other to fix the coils. In  FIG. 30 , the illustration of the stator core  10  and the like is omitted for simplification. The insulating layer  123   a  and the fixing layer  123   b  are examples of a “fourth insulating layer” and a “fourth fixing layer” in the claims, respectively. The foaming agent  123   c  is an example of a “fourth foaming layer” in the claims. 
     As shown in  FIG. 31 , the core leg portion insulating part  122  includes an insulating layer  124   a  and a fixing layer  124   b  that includes a foaming agent  124   c  that foams due to heat. The foaming agent  124   c  foams and expands so as to fix each of the first leg portion  171  and the second leg portion  181  in at least the central axis direction with respect to the stator core  10 . The fixing layer  124   b  of the core leg portion insulating part  122  is configured to bond and fix each of the first leg portion  171  and the second leg portion  181  to the stator core  10 . Thus, it is not necessary to use a varnish or the like to fix each of the first leg portion  171  and the second leg portion  181 . Further, in  FIGS. 30 and 31 , the insulating member  121  and the core leg portion insulating part  122  are illustrated to have a thickness larger than the actual thickness so as to highlight the insulating member  121  and the core leg portion insulating part  122 . Since the insulating layer  123   a  ( 124   a ) and the fixing layer  123   b  ( 124   b ) have the same configurations (materials) as the insulating layer  20   a  and the fixing layer  20   c  of the first embodiment, detailed description thereof will be omitted. The insulating layer  124   a  and the fixing layer  124   b  are examples of a “third insulating layer” and a “third fixing layer” in the claims, respectively. The foaming agent  124   c  is an example of a “third foaming layer” in the claims. 
     Here, in the second embodiment, the fixing layer  124   b  (fixing layer  123   b ) is provided so as to overlap with the entire surface of the insulating layer  124   a  (insulating layer  123   a ). Specifically, the fixing layer  124   b  (fixing layer  123   b ) is provided so as to overlap with the insulating layer  124   a  (insulating layer  123   a ) at a position in the central axis direction corresponding to the contact portion  190  and a position in the central axis direction corresponding to a part of the leg portion ( 171 ,  181 ) other than the contact portion  190 . 
     (Stator Manufacturing Process) 
     Next, with reference to  FIG. 32 , a manufacturing process of the stator  200  will be described. 
     As shown in  FIG. 32 , first, in step S 1 , the insulating member  121  (contact portion insulating part  121   c ) and the core leg portion insulating part  122  are integrally inserted (placed) in the slot  12 . 
     Next, in step S 2 , the second leg portion  181  (see  FIG. 27 ) of the second conductor  180  is inserted in the slot  12  from the other side (Z 1  direction side) in the central axis direction. 
     Next, in step S 3 , the first leg portion  171  (see  FIG. 27 ) of the first conductor  170  is inserted in the slot  12  from one side (Z 2  direction side) in the central axis direction. At this time, the first leg portion  171  is disposed so that the first surface  171   a  of the first leg portion  171  and the second surface  181   a  of the second leg portion  181  face each other. 
     Next, in step S 4 , the spring member  210  (see  FIG. 27 ) is inserted in the slot  12  from the inner radial side through the opening portion  12   a  of the slot  12 . 
     Then, in step S 5 , the stator core  10  is heated and the fixing layer  123   b  is heated and thus, the foaming agent  123   c  is foamed and the fixing layer  123   b  is expanded. In this way, the coil portion  130  is fixed to the slot  12  at least in the central axis direction. 
     The other configurations of the second embodiment are the same as those of the first embodiment. 
     Third Embodiment 
     Next, a stator  300  according to the third embodiment will be described with reference to  FIGS. 33 to 37 . In the stator  300  of the third embodiment, unlike the second embodiment in which the fixing layer  123   b  is provided on the entire surface of the insulating layer  123   a,  a fixing layer  223   b  is partially provided on an insulating layer  223   a . The same components as those in the second embodiment are indicated in the drawings by the same reference numerals as those in the second embodiment and description thereof is omitted. 
     Structure of Stator 
     The structure of the stator  300  according to the third embodiment will be described with reference to  FIGS. 33 to 37 . The stator  300  is an example of the “armature” in the claims. 
     As shown in  FIGS. 33 and 34 , the stator  300  includes a sheet-shaped insulating member  221  and the coil portion  130 . The insulating member  221  is an example of the “joint portion insulating member” in the claims. 
     As shown in  FIG. 35 , the insulating member  221  includes contact portion insulating parts  221   c  that are formed so that the following are continuous: a facing surface insulating part  221   a  on the outer radial side among a pair of the facing surface insulating parts  221   a  disposed adjacent to each other in the radial direction; a circumferential surface insulating part  221   b  provided on one side in the circumferential direction; the facing surface insulating part  221   a  on the inner radial side among the pair of the facing surface insulating parts  221   a;  and the circumferential surface insulating part  221   b  provided on the other side in the circumferential direction. The contact portion insulating part  221   c  is an example of the “joint portion insulating part” in the claims. 
     Further, the stator  300  includes a core leg portion insulating part  222  that is provided between the slot  12  and the coil portion  130  and that is integrally formed with the contact portion insulating part  221   c.    
     Specifically, the core leg portion insulating part  222  has a one side insulating part  222   a  that is continuous with the facing surface insulating part  221   a  on the outermost radial side and that is provided, on one side of the slot  12  in the circumferential direction (left side in  FIG. 35 ), between the slot  12  (circumferential side surface  13   a ) and the coil portion  130  (circumferential surface  190   b ). Further, the core leg portion insulating part  222  has another side insulating part  222   b  that is continuous with the facing surface insulating part  221   a  on the innermost radial side and that is provided, on the other side of the slot  12  in the circumferential direction (right side in  FIG. 35 ), between the slot  12  (circumferential side surface  13   a ) and the coil portion  130  (circumferential surface  190   b ). 
     The core leg portion insulating part  222  includes an inner radial side insulating part  222   c  that is continuous with the one side insulating part  222   a  and that is provided so as to cover the facing surface insulating part  221   a  on the innermost radial side from the inner radial side. Further, the core leg portion insulating part  222  has an outer radial side insulating part  222   d  that is continuous with the other side insulating part  222   b  and that is provided so as to cover the facing surface insulating part  221   a  on the outermost radial side from the outer radial side. 
     Further, as shown in  FIG. 36 , the contact portion insulating part  221   c  includes the insulating layer  223   a  and the fixing layer  223   b  that includes a foaming agent  223   c  that foams due to heat. The foaming agent  223   c  foams and expands so as to fix a coil to a coil adjacent the radial direction. The fixing layer  223   b  is provided on both surfaces of the insulating layer  223   a.  When the fixing layer  223   b  is heated, a thermosetting resin  223   d  is cured. As a result, the fixing layer  223   b  of the contact portion insulating part  221   c  bonds and fixes the coils adjacent to each other. In  FIG. 36 , the illustration of the stator core  10  and the like is omitted for simplification. The insulating layer  223   a  and the fixing layer  223   b  are examples of a “second insulating layer” and a “second fixing layer” in the claims, respectively. The foaming agent  223   c  is an example of a “second foaming layer” in the claims. 
     As shown in  FIG. 37 , the core leg portion insulating part  222  includes an insulating layer  224   a  and a fixing layer  224   b  that includes a foaming agent  224   c  that foams due to heat. The foaming agent  224   c  foams and expands so as to fix each of the first leg portion  171  and the second leg portion  181  in at least the central axis direction with respect to the stator core  10 . The fixing layer  224   b  of the core leg portion insulating part  222  is configured to bond and fix each of the first leg portion  171  and the second leg portion  181  to the stator core  10 . In  FIGS. 36 and 37 , the insulating member  221  and the core leg portion insulating part  222  are illustrated to have a thickness larger than the actual thickness so as to highlight the insulating member  221  and the core leg portion insulating part  222 . The insulating layer  224   a  and the fixing layer  224   b  are examples of a “first insulating layer” and a “first fixing layer” in the claims, respectively. The foaming agent  224   c  is an example of a “first foaming layer” in the claims. 
     Here, in the third embodiment, the fixing layer  224   b  (fixing layer  223   b ) is provided so as to overlap with a part of the insulating layer  224   a  (insulating layer  223   a ) at a position different from a position in the central axis direction corresponding to the contact portion  190 . In other words, in the core leg portion insulating part  222  (contact portion insulating part  221   c ), only the insulating layer  224   a  (insulating layer  223   a ) is provided at the position in the central axis direction corresponding to the contact portion  190 . Specifically, the fixing layer  224   b  (fixing layer  223   b ) is provided separately into two parts that are a part on the one side (Z 2  direction side) in the central axis direction with respect to the first step portion  171   e  (see  FIG. 36 ) and a part on the other side (Z 1  direction side) in the central axis direction with respect to the second step portion  181   e  (see  FIG. 36 ). 
     The rest of the configuration of the third embodiment is similar to that of the second embodiment. 
     Effects of First to Third Embodiments 
     In the first to third embodiments, the following effects can be obtained. 
     In the first to third embodiments, as described above, since the joint portion insulating member ( 21 ,  121 ,  221 ) that insulates the joint portions ( 90 ,  190 ) from each other are sheet-shaped, the sheet-shaped insulating members can be bent so as to easily form the joint portion insulating member ( 21 ,  121 ,  221 ). As a result, the joint portions ( 90 ,  190 ) can be insulated from each other by the joint portion insulating member ( 21 ,  121 ,  221 ) that can be easily formed. The joint portion insulating member ( 21 ,  121 ,  221 ) includes the facing surface insulating part ( 21   a,    121   a,    221   a ) that covers the facing surface ( 90   a,    190   a ) of the joint portions ( 90 ,  190 ) adjacent to each other in the radial direction, and the circumferential surface insulating part ( 21   b,    121   b,    221   b ) that is continuous from both end portions of the facing surface insulating part ( 21   a,    121   a,    221   a ) and that covers one of the circumferential surfaces ( 90   b,    190   b ) of the joint portions ( 90 ,  190 ) adjacent to each other for at least a predetermined distance along the radial direction. Thus, the joint portions ( 90 ,  190 ) adjacent to each other in the radial direction are insulated by the joint portion insulating member ( 21 ,  121 ,  221 ). Further, since the facing surface insulating parts ( 21   a,    121   a,    221   a ) adjacent to each other in the radial direction are connected to each other by the circumferential surface insulating part ( 21   b ,  121   b,    221   b ) in one or the other of the circumferential directions, the joint portion insulating member ( 21 ,  121 ,  221 ) can be easily expanded and contracted in the radial direction, unlike the case in which the facing surface insulating parts ( 21   a,    121   a,    221   a ) adjacent in the radial direction are connected by the circumferential surface insulating part ( 21   b,    121   b,    221   b ) in both circumferential directions. In addition, since the joint portion insulating member ( 21 ,  121 ,  221 ) has a sheet shape with a relatively thin thickness, the space factor of the coil portion ( 30 ,  130 ) in the slot ( 12 ) can be increased. The term “joint portion ( 90 ,  190 )” has a broad meaning including not only the part joined via the bonding agent but also the part that is only in contact without the bonding agent. 
     In addition, in the first to third embodiments, as described above, the joint portion insulating member ( 21 ,  121 ,  221 ) is formed so that the following are continuous: the facing surface insulating part ( 21   a,    121   a,    221   a ) on an outer radial side among a pair of the facing surface insulating parts ( 21   a,    121   a,    221   a ) disposed adjacent to each other in the radial direction; the circumferential surface insulating part ( 21   b,    121   b,    221   b ) provided on one side in the circumferential direction; the facing surface insulating part ( 21   a,    121   a,    221   a ) on an inner radial side among the pair of facing surface insulating parts ( 21   a,    121   a,    221   a ); and the circumferential surface insulating part ( 21   b,    121   b,    221   b ) provided on another side in the circumferential direction. With such a configuration, since the facing surface insulating parts ( 21   a,    121   a,    221   a ) and the circumferential surface insulating parts ( 21   b,    121   b,    221   b ) can be integrally disposed in the slot in one step, the joint portion insulating member ( 21 ,  121 ,  221 ) can be easily disposed in the slot. 
     Further, in the first to third embodiments, as described above, the joint portion insulating member ( 21 ,  121 ,  221 ) is formed by folding one insulating member having a sheet shape. With such a configuration, the joint portion insulating member ( 21 ,  121 ,  221 ) can be expanded and contracted in the radial direction. 
     Further, in the first embodiment, as described above, the joint portion ( 90 ) in which the first segment conductor ( 70 ) and the second segment conductor ( 80 ) are joined is disposed in the slot ( 12 ) on one end portion side with respect to a center of the armature core ( 10 ) in the central axis direction, and a plurality of the joint portions ( 90 ) is configured so that the joint portions ( 90 ) overlap with each other when viewed in the radial direction. With such a configuration, the lengths (L 1 ) of the first leg portions ( 71 ) of the plurality of first segment conductors ( 70 ) are substantially the same as each other and the lengths (L 2 ) of the second leg portions ( 81 ) of the second segment conductors ( 80 ) are substantially the same as each other. In this way, the first segment conductors ( 70 ) and the second segment conductors ( 80 ) can be easily formed. 
     In the first embodiment, as described above, in the joint portion insulating member ( 21 ), an edge portion on one side in the central axis direction is disposed so as to protrude outward from the end surface ( 10   a ) of the armature core ( 10 ) in the central axis direction. With such a configuration, even when the joint portion ( 90 ) is disposed in the slot ( 12 ) near the end portion in the central axis direction, the creepage distance between the end surface ( 10   a ) of the armature core ( 10 ) and the joint portion ( 90 ) can be increased. 
     In the first embodiment, as described above, both the joint portion insulating member ( 21 ) and the core leg portion insulating member ( 20 ) are both disposed so as to protrude outward from the end surface ( 10   a ) of the armature core ( 10 ) in the central axis direction. With such a configuration, the end surface ( 10   a ) of the armature core ( 10 ) and the joint portion ( 90 ) can be insulated from each other by both the joint portion insulating member ( 21 ) and the core leg portion insulating member ( 20 ). 
     In the first embodiment, as described above, a length (L 12 ) of the joint portion insulating member ( 21 ) is smaller than a length (L 11 ) of the core leg portion insulating member ( 20 ) in the central axis direction. With such a configuration, the material forming the joint portion insulating member ( 21 ) can be reduced for the amount in which the length (L 12 ) of the joint portion insulating member ( 21 ) is reduced. 
     In addition, in the first embodiment, as described above, a thickness (t 11 ) of the part ( 20   f ) of the core leg portion insulating member ( 20 ) that overlaps with the joint portion insulating member ( 21 ) is smaller than a thickness (t 12 ) of the part ( 20   b ) of the core leg portion insulating member ( 20 ) that does not overlap with the joint portion insulating member ( 21 ). With such a configuration, even when the core leg portion insulating member ( 20 ) and the joint portion insulating member ( 21 ) are disposed so as to overlap with each other, it is possible to prevent an increase in the total thickness of the core leg portion insulating member ( 20 ) and the joint portion insulating member ( 21 ). As a result, it is possible to prevent the first leg portion ( 71 ) and the second leg portion ( 81 ) disposed in the part ( 20   f ) in which the core leg portion insulating member ( 20 ) and the joint portion insulating member ( 21 ) overlap with each other from being curved with respect to the first leg portion ( 71 ) and the second leg portion ( 81 ) disposed in the part ( 20   b ) in which the core leg portion insulating member ( 20 ) and the joint portion insulating member ( 21 ) are not overlapped (being curved to the inner radial side). 
     In addition, in the second and third embodiments, as described above, each of the plurality of first segment conductors ( 170 ) includes a first leg portion ( 171 ) that extends toward the other side in the central axis direction, that is inserted in the slot ( 12 ), and in which a metal surface ( 140   b ) is exposed without being covered by an insulating coating. Each of the plurality of second segment conductors ( 180 ) includes a second leg portion ( 181 ) that extends to one side in the central axis direction, that is inserted in the slot ( 12 ), and in which a metal surface ( 140   b ) is exposed without being covered by an insulating coating. The joint portion insulating member ( 121 ,  221 ) that has the sheet shape is provided so as to insulate the joint portions ( 190 ) from each other, in which the first leg portion ( 171 ) having the exposed metal surface ( 140   b ) and the second leg portion ( 181 ) having the exposed metal surface ( 140   b ) are in contact without interposing a bonding agent, between the coils that are radially adjacent to each other in the one slot ( 12 ). With such a configuration, the coil end portions ( 172 ,  182 ) are insulated from each other by the insulating coating ( 140   a ) and the leg portions ( 171 ,  181 ) (joining portions ( 190 )) are insulated by the joint portion insulating member ( 121 ,  221 ). Thus, the coil end portions ( 172 ,  182 ) and the leg portions ( 171 ,  181 ) can be insulated from each other by different members. In this way, the thickness of each of the insulating coating ( 140   a ) of the coil end portions ( 172 ,  182 ) and the joint portion insulating member ( 121 ,  221 ) can be individually adjusted. As a result, even when the voltages applied to the coil end portions ( 172 ,  182 ) and the leg portions ( 171 ,  181 ) are different from each other, it is possible to appropriately insulate the coil end portions ( 172 ,  182 ) and the leg portions ( 171 ,  181 ) by adjusting the thickness of each of the insulating coating ( 140   a ) and the joint portion insulating members ( 121 ,  221 ). 
     In addition, since the joint portion insulating member ( 121 ,  221 ) is sheet-shaped and has flexibility compared with a rigid body, it is possible to easily transmit the pressing force from the inner radial side to the entirety of the joint portions ( 190 ) arranged in the radial direction, when the first leg portion ( 171 ) and the second leg portion ( 181 ) are brought into contact. 
     In the second and third embodiments, as described above, the joint portion insulating member ( 121 ,  221 ) includes a joint portion insulating part ( 121   c,    221   c ) that is formed so that the following are continuous: the facing surface insulating part ( 121   a ,  221   a ) on an outer radial side among a pair of facing surface insulating parts ( 121   a ,  221   a ) disposed adjacent to each other in the radial direction; the circumferential surface insulating part ( 121   b,    221   b ) provided on one side in the circumferential direction; the facing surface insulating part ( 121   a,    221   a ) on an inner radial side among the pair of facing surface insulating parts ( 121   a,    221   a ); and the circumferential surface insulating part ( 121   b,    221   b ) provided on another side in the circumferential direction. The armature ( 200 ,  300 ) has the core leg portion insulating part ( 122 ,  222 ) that is provided between the slot ( 12 ) and the coil portion ( 130 ), and that is integrally formed with the joint portion insulating part ( 121   c,    221   c ). With such a configuration, since the joint portion insulating part ( 121   c,    221   c ) and the core leg portion insulating part ( 122 ,  222 ) can be integrally disposed in the slot ( 12 ) in one step, the joint portion insulating part ( 121   c ,  221   c ) and the core leg portion insulating part ( 122 ,  222 ) can be easily disposed in the slot ( 12 ) in one step. 
     In addition, in the second and third embodiments, as described above, the core leg portion insulating part ( 122 ,  222 ) has one side insulating part ( 122   a,    222   a ) that is continuous with the facing surface insulating part ( 121   a,    221   a ) on an outermost radial side and that is provided between the slot ( 12 ) and the coil portion ( 130 ), on one side of the slot ( 12 ) in the circumferential direction. The core leg portion insulating part ( 122 ,  222 ) has another side insulating part ( 122   b,    222   b ) that is continuous with the facing surface insulating part ( 121   a,    221   a ) on the innermost radial side and that is provided between the slot ( 12 ) and the coil portion ( 130 ), on the other side of the slot ( 12 ) in the circumferential direction. With such a configuration, it is possible to prevent conduction of the slot ( 12 ) (armature core ( 10 )) and the coil portion ( 130 ) in the circumferential direction by each of the one side insulating part ( 122   a,    222   a ) and the other side insulating part ( 122   b,    222   b ). Further, since each of the one side insulating part ( 122   a,    222   a ) and the other side insulating part ( 122   b,    222   b ) is continuous with the joint portion insulating part ( 121   c,    221   c ), the one side insulating part ( 122   a,    222   a ) and the other side insulating part ( 122   b,    222   b ) can be disposed in the slot ( 12 ) at the same time as the joint portion insulating part ( 121   c,    221   c ). 
     In the second and third embodiments, as described above, the one side insulating part ( 122   a,    222   a ) extends from an end portion ( 230   a ) on an outer radial side to an end portion ( 230   b ) on an inner radial side of the coil portion ( 130 ) in the slot ( 12 ), and the other side insulating part ( 122   b,    222   b ) extends from the end portion ( 230   b ) on the inner radial side to the end portion ( 230   a ) on the outer radial side of the coil portion ( 130 ) in the slot ( 12 ). With such a configuration, it is possible to more surely prevent conduction of the slot ( 12 ) (armature core ( 10 )) and the coil portion ( 130 ) in the circumferential direction by each of the one side insulating part ( 122   a,    222   a ) and the other side insulating part ( 122   b,    222   b ). 
     In the second and third embodiments, as described above, the core leg portion insulating part ( 122 ,  222 ) has an inner radial side insulating part ( 122   c,    222   c ) that is continuous with the one side insulating part ( 122   a,    222   a ) and that is provided so as to cover the facing surface insulating part ( 121   a,    221   a ) on the innermost radial side from the inner radial side, and an outer radial side insulating part ( 122   d,    222   d ) that is continuous with the other side insulating part ( 122   b,    222   b ) and that is provided so as to cover the facing surface insulating part ( 121   a,    221   a ) on the outermost radial side from the outer radial side. With such a configuration, it is possible to more surely prevent conduction of the coil portion ( 130 ) with the slot ( 12 ) (armature core ( 10 )) and the like via the end portions ( 230   a,    230   b ) on both sides of the coil portion ( 130 ) in the radial direction, with the inner radial side insulating part ( 122   c,    222   c ) and the outer radial side insulating part ( 122   d,    222   d ). 
     Further, it is possible to prevent the joint portion insulating part ( 121   c ,  221   c ) from expanding in the radial direction and deforming, since the joint portion insulating part ( 121   c,    221   c ) is sandwiched in the radial direction by the inner radial side insulating part ( 122   c,    222   c ) and the outer radial side insulating part ( 122   d,    222   d ). As a result, the work of inserting the joint portion insulating part ( 121   c,    221   c ) into the slot ( 12 ) can be facilitated. 
     In the second and third embodiments, as described above, each length (L 22 ) of the joint portion insulating part ( 121   c,    221   c ) and the core leg portion insulating part ( 122 ,  222 ) in the central axis direction is greater than a length (L 62 ) of the slot ( 12 ) in the central axis direction. Each of the joint portion insulating part ( 121   c,    221   c ) and the core leg portion insulating part ( 122 ,  222 ) is disposed so that edge portions on both sides in the central axis direction protrude outward from an end surface ( 10   a,    10   b ) of the armature core ( 10 ) in the central axis direction. With such a configuration, since each of the joint portion insulating part ( 121   c,    221   c ) and the core leg portion insulating part ( 122 ,  222 ) is provided in the entire slot ( 12 ) in the central axis direction, it is possible to more surely insulate the leg portions ( 171 ,  181 ) from each other (the joint portions ( 190 ) from each other) with the joint portion insulating part ( 121   c,    221   c ), and it is also possible to more surely insulate the leg portions ( 171 ,  181 ) and the slot ( 12 ) (armature core ( 10 )) with the core leg portion insulating part ( 122 ,  222 ). 
     In the third embodiment, as described above, the core leg portion insulating part ( 222 ) includes a first insulating layer ( 224   a ) and a first fixing layer ( 224   b ) that has a first foaming agent ( 224   c ) that foams due to heat and in which the first foaming agent ( 224   c ) foams and expands to fix each of the first leg portion ( 171 ) and the second leg portion ( 181 ) to the armature core ( 10 ) in at least the central axis direction. The first fixing layer ( 224   b ) is provided so as to overlap with a part of the first insulating layer ( 224   a ) at a position different from a position in the central axis direction corresponding to the joint portion ( 190 ). With such a configuration, it is possible to prevent the first fixing layer ( 224   b ) from entering between the first leg portion ( 171 ) and the second leg portion ( 181 ) due to expansion of the first fixing layer ( 224   b ). 
     In the third embodiment, as described above, the joint portion insulating part ( 221   c ) includes a second insulating layer ( 223   a ) and a second fixing layer ( 223   b ) that has a second foaming agent ( 223   c ) that foams due to heat and in which the second foaming agent ( 223   c ) foams and expands to fix the coil to the coil adjacent in the radial direction in at least the central axis direction. The second fixing layer ( 223   b ) is provided so as to overlap with a part of the second insulating layer ( 223   a ) at a position different from a position in the central axis direction corresponding to the joint portion ( 190 ). With this structure, it is possible to prevent the second fixing layer ( 223   b ) from entering the joint portion ( 190 ) (for example, a clearance portion ( 171   f,    181   f )) due to the expansion of the second fixing layer ( 223   b ). 
     In the second embodiment, as described above, the core leg portion insulating part ( 122 ) includes a third insulating layer ( 124   a ) and a third fixing layer ( 124   b ) that has a third foaming agent ( 124   c ) that foams due to heat and in which the third foaming agent ( 124   c ) foams and expands to fix each of the first leg portion ( 171 ) and the second leg portion ( 181 ) to the armature core ( 10 ) in at least the central axis direction. The third fixing layer ( 124   b ) is provided over an entire surface of the third insulating layer ( 124   a ). With such a configuration, compared to the case in which the third fixing layer ( 124   b ) is provided so as to overlap with only a part of the third insulating layer ( 124   a ), each of the first leg portion ( 171 ) and the second leg portion ( 181 ) can be stably fixed with respect to the armature core ( 10 ) by the third fixing layer ( 124   b ). 
     In the second embodiment, as described above, the joint portion insulating part ( 121   c ) includes a fourth insulating layer ( 123   a ) and a fourth fixing layer ( 123   b ) that has a fourth foaming agent ( 123   c ) that foams due to heat and in which the fourth foaming agent ( 123   c ) foams and expands to fix the coil to the coil adjacent in the radial direction in at least the central axis direction. The fourth fixing layer ( 123   b ) is provided so as to overlap with an entire surface of the fourth insulating layer ( 123   a ). With such a configuration, compared to the case in which the fourth fixing layer ( 123   b ) is provided so as to overlap with only a part of the fourth insulating layer ( 123   a ), the coils adjacent to each other can be more stably fixed by the fourth fixing layer ( 123   b ). 
     In the second and third embodiments, as described above, each of a plurality of the joint portions ( 190 ) is disposed within the slot ( 12 ), in a central portion in the central axis direction of the armature core ( 10 ). With such a configuration, it is possible to prevent one of the first leg portion ( 171 ) and the second leg portion ( 181 ) from becoming excessively heavier than the other. As a result, it is possible to prevent the first leg portion ( 171 ) or the second leg portion ( 181 ) from becoming too heavy to be fixed by the fixing layer ( 124   b,    224   b ). 
     In the first to third embodiments, as described above, the circumferential surface insulating part ( 21   b,    121   b,    221   b ) is provided so as to cover one of the circumferential surfaces ( 190   b ) of the joint portions ( 90 ,  190 ) adjacent in the radial direction for at least an insulation distance serving as the predetermined distance along the radial direction. With such a configuration, it is possible to more surely insulate the joint portions ( 90 ,  190 ) from each other with the circumferential surface insulating part ( 21   b,    121   b,    221   b ). 
     In the first to third embodiments, as described above, the facing surface insulating part ( 21   a,    121   a,    221   a ) of the joint portion insulating member ( 21 ,  121 ,  221 ) is provided so as to overlap with an entire surface of the facing surface ( 190   a ) of the joint portion ( 90 ,  190 ) when viewed in the radial direction. With such a configuration, it is possible to ensure the joint portions ( 90 ,  190 ) from each other even further with the facing surface insulating part ( 21   a,    121   a,    221   a ). 
     In addition, in the first to third embodiments, as described above, the circumferential surface insulating part ( 21   b,    121   b,    221   b ) of the joint portion insulating member ( 21 ,  121 ,  221 ) is provided so as to overlap with the circumferential surface ( 190   b ) of the joint portion ( 90 ,  190 ) when viewed from the circumferential direction. With such a configuration, it is possible to more surely insulate the circumferential surface ( 190   b ) of the joint portion ( 90 ,  190 ) and the slot ( 12 ) (armature core ( 10 )) with the circumferential surface insulating part ( 21   b,    121   b,    221   b ). 
     Modifications 
     It should be considered that the embodiments presently disclosed are exemplifications in all points and are not restrictive. The scope of the present disclosure is shown by the scope of the claims and not by the above description of the embodiments, and further includes the meanings equivalent to the scope of the claims and all changes (modifications) within the scope. 
     For example, in the above-described embodiment, an example is shown in which the facing surface insulating parts that are disposed so as to be adjacent to each other in the radial direction are alternately connected by the circumferential surface insulating part on one side and the other side in the circumferential direction (that is, the second insulating members are integrally formed). However, the present disclosure is not limited to this. For example, as in a second insulating member  321  according to a first modification shown in  FIG. 38 , facing surface insulating parts  321   a  may be connected to each other in one (or the other) circumferential direction by a circumferential surface insulating part  321   b,  and may be connected to each other in the other (or one) circumferential direction by a circumferential surface insulating part  321   c  that extends in the R 1  direction (or the R 2  direction) for only an insulation distance L 21 . In this case, a plurality of second insulating members  321  are provided in one slot  12 . The second insulating member  321  is an example of the “joint portion insulating member” in the claims. Further, the insulating members ( 121 ,  221 ) of the second and third embodiments may have the same shape. 
     As in a second insulating member  421  according to a second modification shown in  FIG. 39 , facing surface insulating parts  421   a  may be connected to each other in one circumferential direction by a circumferential surface insulating part  421   b,  and may be connected to each other in the other circumferential direction by a circumferential surface insulating part  421   c  that extends in the R 2  direction for only the insulation distance L 21 . Also in this case, a plurality of the second insulating members  421  is provided in one slot  12 . The second insulating member  421  is an example of the “joint portion insulating member” in the claims. Further, the insulating members ( 121 ,  221 ) of the second and third embodiments may have the same shape. 
     In the above-described first embodiment, an example is shown in which the joining portion in which the first segment conductor and the second segment conductor are joined is disposed in the vicinity of the end portion on the Z 2  direction side in the slot. However, the present disclosure is not limited to this. For example, the joint portion may be disposed in the slot near the central portion in the central axis direction or near the end portion on the Z 1  direction side. In the second and third embodiments described above, the contact portion may be disposed in the slot near the end portion on the Z 1  direction side or the Z 2  direction side. 
     Further, in the above-described first to third embodiments, an example is shown in which all the joint portions (contact portions) disposed in one slot are configured to overlap with each other when viewed in the radial direction. However, the present disclosure is not limited to this. In the present disclosure, the configuration only needs to be such that the joint portions (contact portions) adjacent in the radial direction at least overlap with each other when viewed in the radial direction. For example, in one slot, the joint portion (contact portion) disposed on the innermost radial side and the joint portion (contact portion) disposed on the outermost radial side may not overlap with each other when viewed in the radial direction. 
     In the above-described first embodiment, an example is shown in which the second insulating member is disposed so as to protrude outward from the end surface of the stator core in the central axis direction. However, the present disclosure is not limited to this. For example, the second insulating member may be disposed so as not to protrude outward from the end surface of the stator core in the central axis direction. Also in the second and third embodiments, the edge portion of the insulating member may not protrude from the end surface of the stator core in the central axis direction. 
     In the first embodiment, an example is shown in which the thickness of the part of the first insulating member that overlaps with the second insulating member is smaller than the thickness of the part of the first insulating member that does not overlap with the second insulating member. However, the present disclosure is not limited to this. For example, the thickness of the part of the first insulating member that overlaps with the second insulating member and the thickness of the part of the first insulating member that does not overlap with the second insulating member may be substantially the same. 
     In the above-described first embodiment, an example is shown in which the first segment conductor and the second segment conductor are joined in the slot. However, the present disclosure is not limited to this. For example, the first segment conductor and the second segment conductor may be joined to each other on the outer side of the slot in the central axis direction. 
     In the above-described first embodiment, an example is shown in which the second insulating member covers the outer radial side of the joint portion disposed on the outermost radial side and the inner radial side of the joint portion disposed on the innermost radial side. However, the present disclosure is not limited to this. For example, the second insulating member may not cover one (or both) of the outer radial side of the joint portion disposed on the outermost radial side and the inner radial side of the joint portion disposed on the innermost radial side. 
     Moreover, in the first embodiment described above, an example is shown in which the first insulating member and the second insulating member are provided separately. However, the disclosure is not limited to this. For example, the first insulating member and the second insulating member may be integrally provided. 
     In the above-described first embodiment, an example is shown in which the first insulating member including the fixing layer configured as the adhesive layer is used. However, the present disclosure is not limited to this. For example, by using a first insulating member including an expansive material (expansion layer) different from the adhesive layer, the wall portion and the circumferential side surface and the second leg portion may be pressed against each other (pressing force), without being adhered, to be fixed. Similarly, in the second and third embodiments, the fixing layer may not have the adhesive force. 
     In the second and third embodiments, an example is shown in which the contact portion insulating part and the core leg portion insulating part are integrally formed. However, the present disclosure is not limited to this. The contact portion insulating part and the core leg portion insulating part may be provided separately (individually). 
     In the second and third embodiments, an example is shown in which the one side insulating part and the inner radial side insulating part are continuous and the other side insulating part and the outer radial side insulating part are continuous. However, the present disclosure is not limited to this. At least one of the one side insulating part and the inner radial side insulating part and the other side insulating part and the outer radial side insulating part may be provided separately (individually). 
     In the second and third embodiments described above, an example is shown in which the fixing layer is provided up to the edge portion of the insulating layer. However, the present disclosure is not limited to this. For example, the fixing layer may be provided only on the part of the insulating layer housed in the slot. 
     DESCRIPTION OF REFERENCE NUMERALS 
       10  Stator core (armature core) 
       10   a,    10   b  End surface 
       12  Slot 
       20  First insulating member (core leg portion insulating member) 
       20   f  Part (that overlaps with joint portion insulating member) 
       20   b  Part (that does not overlap with the joint portion insulating member) 
       21 ,  321 ,  421  Second insulating member (joint portion insulating member) 
       21   a,    121   a,    221   a  Facing surface insulating part 
       21   b,    121   b,    221   b  circumferential surface insulating part 
       30 ,  130  Coil portion 
       40 ,  140  Segment conductor 
       70 ,  170  First conductor (first segment conductor) 
       80 ,  180  Second conductor (second segment conductor) 
       90  Joint portion 
       90   a,    190   a  Facing surface 
       90   b,    190   b  Circumferential surface 
       100 ,  200 ,  300  Stator (armature) 
       121 ,  221  Insulating member (joint portion insulating member) 
       121   c,    221   c  Contact portion insulation part (joint portion insulating part) 
       122 ,  222  Core leg portion insulating part 
       122   a,    222   a  One side insulating part 
       122   b,    222   b  Other side insulating part 
       122   c,    222   c  Inner radial side insulating part 
       122   d,    222   d  Outer radial side insulating part 
       123   a  Insulating layer (fourth insulating layer) 
       123   b  Fixing layer (fourth fixing layer) 
       123   c  Foaming layer (fourth foaming layer) 
       124   a  Insulating layer (third insulating layer) 
       124   b  Fixing layer (third fixing layer) 
       124   c  Foaming layer (third foaming layer) 
       140   b  Conductor surface (metal surface) 
       171  First leg portion 
       181  Second leg portion 
       190  Contact portion (joint portion) 
       223   a  Insulating layer (second insulating layer) 
       223   b  Fixing layer (second fixing layer) 
       223   c  Foaming agent (second foaming agent) 
       224   a  Insulating layer (first insulating layer) 
       224   b  Fixing layer (first fixing layer) 
       224   c  Foaming agent (first foaming agent) 
       230   a  End portion (end portion on outer radial side of coil portion) 
       230   b  End portion (end portion on inner radial side of coil portion) 
     L 22  Length (length of joint portion insulation part and core leg portion insulation part) 
     L 62  Length (slot length)