Stator

Abstract

In a stator in which tip portions of corresponding leg portions of a plurality of segment coils are electrically connected to each other inside a slot of a stator core, electrical connection between the tip portions is satisfactorily secured, and insulating properties of conductor exposed portions formed at connection portions between the tip portions are further improved. The stator of the present invention comprises: a stator core comprising a plurality of slots; and a plurality of segment coils each having a pair of leg parts inserted into different slots from one end side or the other end side of the stator core, the segment coils forming a stator coil by electrically joining the tip parts of the corresponding leg parts to each other. The front end parts of the corresponding supporting leg parts are electrically connected with each other through a conductive connecting part or are embedded with each other in the slot, and a thermosetting foaming material is arranged in the slot so as to cover a conductor exposed part formed at the connecting part of the front end parts.

Description

Technical Field

[0001] This invention relates to a stator for a rotary electric motor. Background Technology

[0002] Conventionally, a stator for a rotary electric machine is known, comprising a stator core and stator coils wound around the stator core (see, for example, Patent Document 1). In this stator, the stator coils are formed of a plurality of segmented coils and a plurality of connecting members having respective fitting recesses formed at both ends. Each connecting member connects only one pair of segmented coils by fitting the segmented coils into the fitting recesses at both ends, and is configured to be integrally housed within a slot in the stator core. Furthermore, at least a portion of each connecting member is formed of an insulating material to insulate the segmented coils to be connected from other segmented coils, and almost the entire end (peeled portion) of the segmented coil with its coil sheath peeled off is accommodated in each fitting recess. Thus, after connecting the segmented coils via the connecting members, insulation treatment of the peeled portion is not required, thereby further simplifying the manufacturing process.

[0003] Patent Document 1: Japanese Patent No. 7003674 Summary of the Invention However, when an insulating film is applied to the outer surface of the connecting component made of conductive material, it is difficult to form an insulating film on the end face (edge) of the connecting component. Therefore, even if almost the entire end (stripping portion) of the segmented coil is housed within the connecting component, exposed conductor portions will still form around the periphery of the connecting component. Therefore, in order to prevent surface discharge between closely spaced exposed conductor portions, the spacing between the exposed conductor portions needs to be extended along the axial direction of the stator core, which may increase the axial length of the stator core. Furthermore, if defects such as pinholes occur in the insulating film of the segmented coil near the exposed conductor portion, the insulation of the exposed conductor portion is significantly reduced. Moreover, when the connecting component is formed entirely of insulating material, it may not be possible to reliably ensure the electrical connection between the corresponding segmented coils.

[0004] Therefore, the main objective of the present invention is to ensure good electrical connection between the front ends of the corresponding legs of multiple segmented coils in a stator where the front ends are electrically connected to each other inside the slots of the stator core, while further improving the insulation of the exposed conductor portions of the connection portions formed between the front ends.

[0005] The stator of the present invention includes: a stator core comprising a plurality of slots spaced apart circumferentially in a radially extending manner; and a plurality of segmented coils having a pair of legs inserted into different slots from one end or the other end of the stator core, and forming stator coils by electrical connection of the front ends of the corresponding legs to each other, wherein the front ends of the corresponding legs are electrically connected to each other inside the slots via conductive connecting members or by interlocking with each other, and a thermosetting foam material is disposed inside the slots to cover the exposed conductor portions of the connection portions formed between the front ends.

[0006] In the stator of the present invention, the front ends of corresponding legs of a plurality of segmented coils are electrically connected to each other within slots in the stator core via conductive connecting members or by interlocking. Furthermore, a thermosetting foam material is disposed within the slot to cover the exposed conductor portions of the connections formed between the front ends. That is, by distributing thermosetting foam material around the periphery of the connections between the front ends of the corresponding legs, and heating the stator coils or stator core after assembly, the thermosetting foam material can be filled into the slot to cover the exposed conductor portions of the connections. This ensures reliable electrical connection between the front ends of the corresponding legs while further improving the insulation of the exposed conductor portions of the connections.

[0007] Furthermore, the segmented coil can be a conductor with an insulating film applied to its surface, or the insulating film can be peeled off from the front end portion of the support portion. In each of the plurality of slots, a plurality of the support portions can be inserted in multiple layers along the radial direction from one end side and the other end side of the stator core. Inside the slot, a plurality of exposed conductor portions can be arranged separately along the axial direction of the stator core from the exposed conductor portions of the adjacent layers in a manner opposite to the insulating film of the support portions of the adjacent layers.

[0008] This ensures that the exposed conductors are spaced apart from each other. Therefore, if the thermosetting foam material is filled into the slot in a way that fully covers the exposed conductors, surface discharge between the exposed conductors can be well suppressed.

[0009] Furthermore, the front ends of the corresponding legs can be electrically connected to each other within the slot via a connecting member formed of a conductor, the exposed portion of which can be formed by the connecting member and the front ends of the two legs located on both sides of the connecting member in the axial direction.

[0010] Therefore, it is possible to ensure the electrical connection between the front ends of the corresponding support legs, and to suppress the increase in stator cost by omitting the insulating film from the outer peripheral surface of the multiple connecting parts used to form the stator coil.

[0011] Furthermore, a thermosetting foam sheet can be attached to the leg portion of the segmented coil in such a manner that it is opposite to the ends of the insulating film on both sides of the exposed conductor portion in the radial direction and in the axial direction of the exposed conductor portion.

[0012] Therefore, after the stator coil is assembled, the stator coil and other components are heated to cause the foam layer of the thermosetting foam sheet to foam, thereby more reliably covering the exposed conductor portion and thus ensuring the insulation of the exposed conductor portion very well.

[0013] Furthermore, on the outer peripheral surface of the connecting member, to the segmented coil adjacent in the radial direction... The insulating film on the support leg is attached with thermosetting foam sheets in an opposing manner.

[0014] In this method, after the stator coil is assembled, the stator coil and the like are heated to foam the foam layer of the thermosetting foam sheet, thereby ensuring the insulation of the exposed conductor portion very well. Attached Figure Description

[0015] Figure 1 This is a schematic structural diagram of the stator of the present invention.

[0016] Figure 2 This is a perspective view showing the segmented coils and connecting components included in the stator of the present invention.

[0017] Figure 3 This is a schematic structural diagram showing the assembly sequence of the stator of the present invention.

[0018] Figure 4 This is an enlarged view showing the main part of the stator of the present invention.

[0019] Figure 5 It is along Figure 4 A sectional view cut by the VV line.

[0020] Figure 6 This is an enlarged view of the main parts showing the deformation mode of the stator of the present invention. Detailed Implementation

[0021] Next, with reference to the accompanying drawings, the method for carrying out the invention will be described.

[0022] Figure 1 This is a perspective view of the stator 1 of the present invention. Figure 1The stator 1 shown, together with the rotor (not shown), constitutes, for example, a three-phase AC motor (rotating motor) used as a driving source or generator for electric vehicles or hybrid vehicles. In this embodiment, the stator 1 includes an annular stator core 2, stator coils 3u (U-phase coils), stator coils 3v (V-phase coils), and stator coils 3w (W-phase coils).

[0023] The stator core 2 of the stator 1 is formed, for example, by stacking multiple electromagnetic steel plates that are formed into a generally annular shape by stamping and connecting them in the stacking direction, or by pressing and sintering a strongly magnetic powder body into an annular shape. The stator core 2 includes a central hole 2o with a rotor disposed thereon (see reference). Figure 1 ), a plurality of teeth 2t extending radially from the annular outer periphery (yoke) toward the axis and adjacent to each other in the circumferential direction at constant intervals (reference). Figure 3 ), and a plurality of (in this embodiment, for example, 48) slots 2s formed between adjacent teeth 2t (see reference ). Figure 2 Multiple slots 2s extend radially along the stator core 2 and are arranged at constant intervals in the circumferential direction, and open in the central hole 2o.

[0024] Stator coils 3u, 3v, and 3w are formed by electrically connecting multiple segmented coils (coil wires) 30, multiple inner peripheral segmented coils (not shown), and multiple outer peripheral segmented coils (not shown). In this embodiment, stator coils 3u, 3v, and 3w include, for example, multiple coils connected in series and interconnected by a star connection (Y connection). The segmented coils 30, for example, are conductors formed into a generally U-shape by bending a flat wire with an insulating film IL made of varnish resin on its surface in both the flat width direction and the edge width direction. Figure 2 As shown, the segmented coil 30 includes a pair (two) of legs 31 and 32 extending in a straight line and having a front end T with the conductor exposed after the insulating film IL has been removed, and a bridging wire 33 connecting the two legs 31 and 32. In this embodiment, in the segmented coil 30, one leg 31 is formed to be longer than the other leg 32. Moreover, in this embodiment, the segmented coil 30 includes various segmented coils with different circumferential spacing between the pair of legs 31 and 32. Furthermore, the inner peripheral segmented coils each include a pair of legs having a length approximately the same as the aforementioned leg 32, and the outer peripheral segmented coils each include a pair of legs having a length approximately the same as the aforementioned leg 31.

[0025] like Figure 3 As shown, a portion of the support legs 31 and 32 of the multiple segmented coils 30 extend from one end of the stator core 2 ( Figure 3The lower side (i.e., the opposite lead side) is inserted into the different slots 2s. Furthermore, the remaining segmented coil 30's legs 31 and 32 are positioned axially opposite to the corresponding legs 32 or 31 on the opposite lead side of the stator core 2, and are inserted from the other end of the stator core 2. Figure 3 The lead wire end face is inserted into the different slots 2s. Furthermore, multiple segmented coils 30, etc., are assembled onto the stator core 2 in a radially alternating manner with multiple (in this embodiment, for example, 6) support portions 31, 32, etc., in each of the multiple slots 2s. Thus, in the stator 1, multiple (in this embodiment, 6 layers) layers of support portions 31, 32, etc., adjacent in the circumferential direction are formed radially. Hereinafter, the layer of multiple support portions 31, 32 (front end T) adjacent in the circumferential direction on the outermost circumference of the stator core 2 will be called "layer 1", the layers on the radially inner side will be called "layer 2", "layer 3", ..., and the layer of multiple support portions 31, 32 adjacent in the circumferential direction on the innermost circumferential side will be called "layer 6". The number of "layers" in the stator 1 is the same as the number of support portions 31, 32, etc., arranged in each slot 2s.

[0026] When assembled into the stator core 2, multiple segmented coils 30 are radially overlapped with adjacent crossover portions 33 staggered in the circumferential direction, and the front ends T of multiple support portions 31 are adjacent in the circumferential direction. Each support portion 32 overlaps with the corresponding support portion 31 on the radially inner side, and the front ends T of multiple support portions 32 are adjacent in the circumferential direction. Thus, they are arranged in a ring shape by a known annular arrangement device (for example, refer to Japanese Patent No. 3975891). Multiple assemblies of segmented coils 30 arranged in this ring shape are prepared in a manner corresponding to the first and second layers, the second and third layers, the third and fourth layers, the fourth and fifth layers, or the fifth and sixth layers. Furthermore, for example, assemblies of segmented coils 30 corresponding to the second, third, fourth, and fifth layers, assembled from the opposite lead side to the stator core 2, and assemblies of segmented coils 30 corresponding to the first, second, third, fourth, fifth, and sixth layers, assembled from the lead side to the stator core 2.

[0027] Furthermore, multiple inner peripheral segmented coils are formed, for example, corresponding to the sixth layer on the innermost periphery, with adjacent bridging portions overlapping each other radially in a state of offset from each other in the circumferential direction, and arranged in a ring with the front ends of multiple support portions adjacent in the circumferential direction, for example, assembled onto the stator core 2 from the opposite lead side. Similarly, multiple outer peripheral segmented coils are formed, for example, corresponding to the first layer on the outermost periphery, with adjacent bridging portions overlapping each other radially in a state of offset from each other in the circumferential direction, and arranged in a ring with the front ends of multiple support portions adjacent in the circumferential direction, for example, assembled onto the stator core 2 from the opposite lead side. Thus, on the opposite lead side of the stator core 2, a ring-shaped coil end 3R (see reference) is formed by the bridging portions 33 of multiple segmented coils 30 and the bridging portions of multiple inner segmented coils and multiple outer segmented coils. Figure 1 The coil end 3L is formed by the bridging portion 33 of multiple segmented coils 30 into a ring shape (see reference). Figure 1 ).

[0028] like Figure 1 and Figure 3 As shown, the front ends T of the support portions 31, 32, etc., inserted into the corresponding slots 2s are axially opposed to the front ends T of the support portions 32 or 31, etc., inserted into the slots 2s from the opposite side, and the opposing front ends T are electrically connected to each other inside the slots 2s via connecting members 35. The stator coils 3u, 3v, 3w are wound on the stator core 2 through the front ends T of the corresponding segmented coils 30, etc., which are electrically connected to each other. Furthermore, for example, the support portions 31, 32, etc., inserted into the first and second layers or the sixth and fifth layers of the specified slots 2s are electrically connected to the power line or neutral point on the lead side of the stator core 2 via I-shaped segments and busbar units (not shown).

[0029] Figure 4 This is an enlarged view showing the main part of the connection between the front ends T of the segmented coils 30, etc., in stator 1. Figure 5 It is along Figure 4 A cross-sectional view of the VV line in the figure. As shown in these figures, an insulator (insulating paper) 4 is arranged in each slot 2s of the stator core 2. Figure 5 As shown, the insulator 4 is bent into a rectangular cylindrical shape according to the cross-sectional shape of the slot 2s, and inserted into each slot 2s from the opposite lead side or lead side of the stator core 2 before the assembly of the segmented coils 30, etc. The support portions 31, 32, etc. of the multiple segmented coils 30, etc., are inserted into the inside of the insulator 4 within each slot 2s. Inside the insulator 4, as... Figure 4 As shown, the legs 31 and 32 are arranged alternately in the radial direction.

[0030] The connecting member 35, used to connect the front ends T of the segmented coils 30, etc., to each other, is a cylindrical body that fits into the front ends T at both ends. In this embodiment, the connecting member 35 is formed as a corner tube with a rectangular cross-section hole in the conductor, and no insulating film such as varnish resin is applied to the outer surface of the connecting member 35. Furthermore, the front ends T of the support portions 31, 32, etc., of the segmented coils 30, etc., include a thin-walled portion on the front end side and a thick-walled portion formed between the thin-walled portion and the end of the insulating film IL. The thin-walled portion is formed to be firmly embedded in the opening at the end of the connecting member 35, and a chamfer is performed on its front end. In contrast, the thick-walled portion is formed to be thicker than the opening width of the connecting member 35 or the thin-walled portion, so as not to be embedded in the end of the connecting member 35.

[0031] If the thin-walled portion of the front end portion T of the opposite lead side support portion 31, 32, etc., fits into the corresponding end of the connecting member 35 with the thin-walled portion of the front end portion T of the lead side support portion 32 or 31, etc., then the two front ends T, i.e. the corresponding two supports 31, 32, etc., are electrically connected. On the other hand, the thick-walled portion (conductor) of each front end portion T cannot be embedded into the end of the connecting member 35, and is thus exposed to the outside of the connecting member 35. Thus, in each of the connection portions of the front ends T, a conductor exposure portion Cex is formed by the connecting member 35 without an insulating film and the front ends T of the two supports 31, 32, etc., located on both sides of the axial direction of the connecting member 35.

[0032] like Figure 4 As shown, each of the plurality of exposed conductor portions Cex is arranged axially separate from the exposed conductor portion Cex of the adjacent layer toward the stator core 2, inside the slot 2s (insulator 4), opposite to the insulating film IL of the adjacent layer's support portions 31 or 32, etc. That is, a plurality of connecting members 35 connecting the front ends T of the support portions 32, etc., on the opposite lead side (lower side in the figure) and the front ends T of the support portions 31 on the lead side (upper side in the figure) are arranged radially near the end face of the opposite lead side of the stator core 2 via the support portions 31 on the opposite lead side. Conversely, a plurality of connecting members 35 connecting the front ends T of the support portions 31, etc., on the opposite lead side and the front ends T of the support portions 32 on the lead side are arranged radially near the end face of the stator core 2 via the support portions 31 on the lead side.

[0033] Here, by separating each exposed conductor portion Cex axially from the exposed conductor portions Cex of adjacent layers towards the stator core 2, surface discharge between exposed conductor portions Cex that are close to each other can be suppressed. However, from the viewpoint of suppressing the increase of the axial length of the stator core 2, there are limitations on extending the axial spacing between the exposed conductor portions Cex. Furthermore, in the event of defects such as pinholes in the insulating film IL of the support portions 31, 32, etc., opposite to the exposed conductor portions Cex, the insulation of the exposed conductor portions Cex is significantly reduced.

[0034] Based on these, inside each slot 2s (insulator 4), such as Figure 4 and Figure 5 As shown, an epoxy-based thermosetting foam material 50 is disposed (filled) to cover the exposed conductor portion Cex formed at the connection between the aforementioned front ends T. In this embodiment, as... Figure 4 As shown, before assembling the segmented coil 30, etc., into the stator core 2, a thermosetting foam sheet 55 is attached to the insulating film IL of the support portions 31, 32, etc. of the segmented coil 30, etc., in a manner opposite to the radially adjacent exposed conductor portion Cex and the ends of the insulating film IL on both sides of the exposed conductor portion Cex in the axial direction. Figure 4 (The dashed line in the middle).

[0035] The thermosetting foam sheet 55 includes a substrate and a foam layer composed of a thermosetting foam material 50 formed on the surface and back of the substrate. The substrate of the thermosetting foam sheet 55 is, for example, a sheet made of a resin material with heat resistance and insulation, such as polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), or polyimide (PI). The foam layer is an insulating layer made of an epoxy-based foam resin material as described above, which expands upon heating and then cures. Furthermore, the foam layer formed on one of the surface and back of the substrate is imparted with adhesiveness.

[0036] Therefore, if the assembly of segmented coil 30 and others relative to stator core 2 is completed, that is, the assembly of stator coils 3u, 3v, and 3w, then as follows Figure 4 As shown, each exposed conductor Cex is positioned opposite one or both sides of the thermosetting foam sheet 55 in the radial direction of the stator core 2. Then, after the stator coils 3u, 3v, and 3w are assembled, each stator coil 3u, 3v, and 3w is heated by applying current, or the stator core 2 is heated by a heater or the like, thereby heating each thermosetting foam sheet 55. Thus, as... Figure 4 and Figure 5 As shown, the thermosetting foam material 50 expands (foams) and cures to fill each slot 2s by covering the exposed conductor Cex of the connection between the front ends T.

[0037] As described above, in the stator 1, the front ends T of the corresponding support portions 31, 32, etc. of the plurality of segmented coils 30, etc., are electrically connected to each other within each slot 2s of the stator core 2 via conductive connecting members 35. Then, inside each slot 2s, a thermosetting foam material 50 is arranged to cover the exposed conductor portion Cex formed at the connection portion of the front ends T. That is, when manufacturing the stator 1, before assembling the plurality of segmented coils 30, etc., relative to the stator core 2, a thermosetting foam sheet 55 is attached to the insulating film IL of the support portions 31, 32, etc., thereby arranging a foam layer of thermosetting foam sheet 55 made of thermosetting foam material 50 around the periphery of the connection portion of the front ends T of the corresponding support portions 31, 32, etc. Therefore, after assembling the stator coils 3u, 3v, and 3w, by heating each stator coil 3u, 3v, 3w or the stator core 2, thermosetting foam material 50 can be filled into each slot 2s in a manner that covers the exposed conductor portion Cex formed at the connection. This ensures good electrical connection between the front ends T of the corresponding support portions 31, 32, etc., while further improving the insulation of the exposed conductor portion Cex at the connection between the front ends T.

[0038] Furthermore, in the stator 1, thermosetting foam sheets 55 are attached to the support portions 31, 32, etc., of the segmented coils 30, etc., in a manner that faces the ends of the insulating films IL on both sides of the radially adjacent exposed conductor portion Cex and the exposed conductor portion Cex in the axial direction. Thus, after the stator coils 3u, 3v, 3w are assembled, each stator coil 3u, 3v, 3w, etc., is heated to cause the foam layer of the thermosetting foam sheet 55 to foam (expand), thereby more reliably covering each exposed conductor portion Cex, and thus ensuring the insulation of each exposed conductor portion Cex is extremely well ensured.

[0039] Furthermore, the segmented coils 30, which form the stator coils 3u, 3v, and 3w, are conductors with an insulating film IL applied to their surface. The insulating film IL is peeled off from the front ends T of the support portions 31, 32, etc. The support portions 31, 32, etc., of the multiple segmented coils 30, etc., are arranged radially in multiple layers from the opposite lead side (one end side) and lead side (the other end side) of the stator core 2 and inserted into multiple slots 2s. Moreover, inside each slot 2s, each of the multiple exposed conductor portions Cex is arranged axially away from the exposed conductor portion Cex of the adjacent layer, opposite to the insulating film IL of the support portions 31, 32, etc. of the adjacent layer. This ensures the spacing between the exposed conductor portions Cex, and therefore, if the thermosetting foam material 50 is filled into each slot 2s to fully cover each exposed conductor portion Cex, surface discharge between the exposed conductor portions Cex can be effectively suppressed.

[0040] Furthermore, the front ends T of the corresponding support legs 31, 32, etc., are electrically connected to each other within the slot 2s via a connecting member 35 formed of a conductor. Moreover, the exposed conductor Cex in the connection portion between the front ends T is formed by the connecting member 35 and the two front ends T of the support legs 31, 32, etc., located on both sides of the connecting member 35 along its axial direction. Therefore, the electrical connection between the front ends T of the corresponding support legs 31, 32, etc., can be reliably ensured, and the cost increase of the stator 1 can be suppressed by omitting the insulating film from the outer peripheral surfaces of the multiple connecting members 35 used to form the stator coils 3u, 3v, 3w.

[0041] Alternatively, in stator 1, a thermosetting foam sheet 55 can be attached to the insulating film IL of the support legs 31, 32, etc., instead of the original foam sheet 55. Figure 6 As shown, a thermosetting foam sheet 55 is attached to the outer peripheral surface of the connecting component 35. In this case, before assembling the segmented coils 30, etc., relative to the stator core 2, the thermosetting foam sheet 55 is attached to the entire circumference or a portion of the outer peripheral surface of each connecting component 35 in a manner opposite to the insulating film IL of the radially adjacent segmented coils 30, etc. In this manner, after the stator coils 3u, 3v, 3w are assembled, the foam layer of the thermosetting foam sheet 55 is foamed by heating each stator coil 3u, 3v, 3w, etc., thereby ensuring the insulation of each conductor exposed portion Cex extremely well.

[0042] Furthermore, in the stator 1, the front ends T of the support legs 31, 32, etc., do not necessarily need to be connected to each other via the connecting member 35; the front ends T of the corresponding support legs 31, 32, etc., can be connected to each other by fitting together. Moreover, in the stator 1, the insulator 4 may include a substrate and a foam layer composed of a thermosetting foam material 50 formed on the substrate. This increases the amount of thermosetting foam material 50 filled into each slot 2s, thereby ensuring excellent insulation of each exposed conductor portion Cex.

[0043] The invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention. Moreover, the embodiments described above are merely specific ways of the invention as described in the summary section of the invention, and are not limited to the elements of the invention described in the summary section of the invention.

[0044] Industrial availability The invention can be applied to industries such as the manufacture of stators or rotating electric machines including such stators.

[0045] Symbol Explanation 1-Stator, 2-Stator core, 2o-Center hole, 2s-Slot, 2t-Tooth, 3L, 3R-Coil end, 3u, 3v, 3w-Stator coil, 4-Insulator, 30-Segmented coil, 31, 32-Feet, 33-Bridging part, 35-Connecting part, 50-Thermosetting foam material, 55-Thermosetting foam sheet, Cex-Conductor exposed part, IL-Insulating film, T-Front end.

Claims

1. A stator, characterized in that, include: The stator core includes a plurality of slots spaced circumferentially in a radially extending manner; and multiple segmented coils, each having a pair of legs inserted into distinct slots from one or the other end of the stator core, and forming a stator coil by electrical connection of the front ends of the corresponding legs, wherein the stator, The front ends of the corresponding support legs are electrically connected to each other inside the slot via a conductive connecting member or by fitting together. Thermosetting foam material is disposed inside the slot to cover the exposed conductor portions of the connections formed between the front ends.

2. The stator according to claim 1, characterized in that, The segmented coil is a conductor with an insulating film applied to its surface. Peel the insulating film from the front end of the support leg. In each of the plurality of slots, a plurality of support portions are inserted radially in a multi-layered arrangement from one end and the other end of the stator core. Inside the slot, a plurality of conductor exposures are arranged axially from the conductor exposures of the adjacent layers, opposite to the insulating film of the foot portions of the adjacent layers.

3. The stator according to claim 2, characterized in that, The front ends of the corresponding support legs are electrically connected to each other within the slot via a connecting member formed of a conductor. The exposed conductor portion is formed by the connecting member and the front ends of the two legs located on both sides of the connecting member along its axial direction.

4. The stator according to claim 3, characterized in that, A thermosetting foam sheet is attached to the leg portion of the segmented coil in such a manner that it is opposite to the ends of the insulating film on both sides of the exposed conductor in the radial direction and on both sides of the exposed conductor in the axial direction.

5. The stator according to claim 3, characterized in that, A thermosetting foam sheet is attached to the outer peripheral surface of the connecting component in such a manner that it is opposite to the insulating film of the foot portion of the segmented coil adjacent in the radial direction.

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