stata

Abstract

In a stator in which the corresponding leg tips of multiple segment coils are electrically connected to each other within the slots of the stator core, the electrical connection between the tips is ensured to be good, while further improving the insulation of the exposed conductor portion formed at the connection between the tips. [Solution] The stator of the present disclosure includes a stator core having a plurality of slots, and a plurality of segment coils having a pair of legs inserted into different slots from one end or the other end of the stator core, and forming a stator coil by electrical joining of the tips of the corresponding legs, wherein the tips of the corresponding legs are electrically connected within the slot via a conductive connecting member or by fitting together, and a thermosetting foam material is arranged inside the slot so as to cover the conductor exposed portion formed at the connection between the tips.

Description

Technical Field

[0001] This disclosure relates to a stator of a rotating electric machine.

Background Art

[0002] Conventionally, a stator of a rotating electric machine including a stator core and a stator coil wound around the stator core has been known (see, for example, Patent Document 1). In this stator, the stator coil is formed by a plurality of segment coils and a plurality of connecting members each having fitting recesses formed at each of both ends. Each connecting member connects only a pair of segment coils by fitting the segment coils into the fitting recesses at both ends, and is arranged so as to fit entirely within the slots of the stator core. Further, at least a part of each connecting member is formed of an insulating material so as to insulate the segment coil to be connected from other segment coils, and substantially the entire end portion (peeled portion) of the segment coil from which the coil film has been peeled is accommodated in each fitting recess. Thereby, after connecting the segment coils via the connecting members, insulation treatment of the peeled portion becomes unnecessary, and thus the manufacturing process can be simplified.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when applying an insulating coating to the outer surface of a connecting member made of conductive material, it is difficult to form the insulating coating on the end face (edge ​​portion) of the connecting member. As a result, even if almost the entire end (detached portion) of the segment coil is housed within the connecting member, exposed conductor portions will be formed around the connecting member. Therefore, to prevent creepage discharge from occurring between adjacent exposed conductor portions, it becomes necessary to widen the spacing between them in 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 coating of the segment coil adjacent to the exposed conductor portion, the insulating properties of that exposed conductor portion will be significantly reduced. In addition, if the entire connecting member is made of insulating material, it may become impossible to ensure a good electrical connection between the corresponding segment coils.

[0005] Therefore, the primary objective of this disclosure is to improve the insulation of exposed conductor portions formed at the connection points between the tips of corresponding legs of multiple segment coils in a stator where the tips are electrically connected inside the slots of the stator core, while ensuring good electrical connection between the tips. [Means for solving the problem]

[0006] The stator of the present disclosure includes a stator core including a plurality of slots formed circumferentially spaced apart so as to extend radially, and a plurality of segment coils having a pair of legs inserted into different slots from one end or the other end of the stator core, and forming a stator coil by electrical joining of the tips of the corresponding legs, wherein the tips of the corresponding legs are electrically connected within the slot via a conductive connecting member or by fitting together, and a thermosetting foam material is disposed within the slot so as to cover the exposed conductor portion formed at the connection between the tips.

[0007] In the stator of this disclosure, the tips of corresponding legs of multiple segment coils are electrically connected within the slots of the stator core via conductive connecting members or by fitting together. A thermosetting foam material is then placed inside the slots to cover the exposed conductor portion formed at the connection point between the tips. That is, by placing the thermosetting foam material around the connection point between the tips of the corresponding legs and heating the stator coil and stator core after the assembly of the stator coil is complete, the thermosetting foam material can be filled into the slots to cover the exposed conductor portion formed at the connection point. This makes it possible to ensure good electrical connection between the tips of the corresponding legs while further improving the insulation of the exposed conductor portion formed at the connection point between the tips.

[0008] Furthermore, the segment coil may be a conductor with an insulating coating on its surface, and the insulating coating may be peeled off from the tip of the leg portion. Multiple leg portions may be inserted into each of the multiple slots in multiple layers in the radial direction from one end and the other end of the stator core. Within the slots, each of the multiple exposed conductor portions may be spaced apart in the axial direction of the stator core from the exposed conductor portion of the adjacent layer so as to face the insulating coating of the leg portion of the adjacent layer.

[0009] This ensures that there is sufficient space between exposed conductors, and by filling the slots with thermosetting foam material to adequately cover the exposed conductors, it becomes possible to effectively suppress surface discharge between the exposed conductors.

[0010] Furthermore, the corresponding tip portions of the legs may be electrically connected to each other via the connecting member formed of a conductor within the slot, and the exposed conductor portion may be formed by the connecting member and the tip portions of the two legs located on both sides in the axial direction of the connecting member.

[0011] This ensures good electrical connection between the corresponding leg tips and allows for the omission of insulating coatings from the outer surfaces of numerous connecting members that form the stator coil, thereby suppressing cost increases for the stator.

[0012] Furthermore, a thermosetting foam sheet may be attached to the leg portion of the segment coil so as to face the radially adjacent exposed conductor portion and the ends of the insulating coating on both sides in the axial direction of the exposed conductor portion.

[0013] This allows the stator coil and other components to be heated after assembly to cause the foam layer of the thermosetting foam sheet to expand, thereby more reliably covering the exposed conductor portion and ensuring extremely good insulation of the exposed conductor portion.

[0014] Furthermore, a thermosetting foam sheet may be attached to the outer circumferential surface of the connecting member so as to face the insulating coating on the legs of the radially adjacent segment coils.

[0015] In this embodiment as well, by heating the stator coil and the like after the assembly of the stator coil is complete to foam the foam layer of the thermosetting foam sheet, it becomes possible to ensure extremely good insulation of the exposed conductor portion. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram showing the status of this disclosure. [Figure 2] This is a perspective view showing the segment coil and connecting members included in the stator of this disclosure. [Figure 3] This is a schematic diagram showing the assembly procedure for the stator of this disclosure. [Figure 4] This is an enlarged view of the main part showing the statator of this disclosure. [Figure 5] This is a cross-sectional view along the VV line in Figure 4. [Figure 6] This is an enlarged view of the main part showing a modified form of the stator of this disclosure.

Embodiments for Carrying out the Invention

[0017] Next, embodiments for carrying out the invention of the present disclosure will be described while referring to the drawings.

[0018] FIG. 1 is a perspective view showing a stator 1 of the present disclosure. The stator 1 shown in the figure constitutes a three-phase alternating current electric motor (rotating electric machine) used as a driving source for running or a generator of, for example, an electric vehicle or a hybrid vehicle together with a rotor not shown. In the present embodiment, the stator 1 includes an annular stator core 2, a stator coil 3u (U-phase coil), a stator coil 3v (V-phase coil), and a stator coil 3w (W-phase coil).

[0019] The stator core 2 of the stator 1 is formed by laminating a plurality of electromagnetic steel sheets formed into a substantially annular shape by, for example, press working and connecting them in the lamination direction, or formed into an annular shape by, for example, pressure molding and sintering ferromagnetic powder. The stator core 2 includes a central hole 2o (see FIG. 1) where the rotor is disposed, a plurality of teeth 2t (see FIG. 3) that extend radially from the annular outer peripheral portion (yoke portion) toward the axis and are adjacent to each other at regular intervals in the circumferential direction, and a plurality (in this embodiment, for example, 48) of slots 2s (see FIG. 2) formed between adjacent teeth 2t. The plurality of slots 2s each extend in the radial direction of the stator core 2, are arranged in the circumferential direction at regular intervals, and open at the central hole 2o.

[0020] The stator coils 3u, 3v, and 3w are each formed by electrically joining multiple segment coils (coil wires) 30, multiple inner-circumferential segment coils (not shown), and multiple outer-circumferential segment coils (not shown). In this embodiment, the stator coils 3u, 3v, and 3w include, for example, multiple coils electrically connected in series and connected to each other by a star connection (Y connection). The segment coils 30, etc., are conductors formed in a substantially U-shape by bending a flat rectangular wire, for example, which has an insulating coating IL made of enamel resin deposited on its surface, in the flatwise direction and the edgewise direction. As shown in Figure 2, the segment coil 30 includes a pair (two) of legs 31 and 32 that extend in a straight line and have a tip T where the insulating coating IL is removed and the conductor is exposed, and a jumper wire portion 33 that connects the two legs 31 and 32. In this embodiment, one leg 31 of the segment coil 30 is formed to be longer than the other leg 32. Furthermore, in this embodiment, the segment coil 30 includes multiple types of segment coils, each with different spacings in the circumferential direction of a pair of legs 31 and 32. The inner circumferential segment coils each include a pair of legs having approximately the same length as the legs 32, and the outer circumferential segment coils each include a pair of legs having approximately the same length as the legs 31.

[0021] Among a plurality of segment coils 30, some leg portions 31 and 32 are inserted into different slots 2s from one end side (the lower side in FIG. 3) of the stator core 2, that is, from the end face side on the anti-lead side. Further, leg portions 31 and 32 of the remaining segment coils 30 are inserted into different slots 2s from the other end side (the upper side in FIG. 3) of the stator core 2, that is, from the end face side on the lead side, so as to face the corresponding leg portion 32 or 31 on the anti-lead side in the axial direction of the stator core 2. Further, a plurality of segment coils 30 and the like are assembled to the stator core 2 such that a plurality (for example, six in this embodiment) of leg portions 31, 32, etc. are arranged alternately in the radial direction at each of the plurality of slots 2s. Thereby, a plurality (six layers in this embodiment) of layers of leg portions 31, 32, etc. adjacent to each other in the circumferential direction are formed in the stator 1 in the radial direction. Hereinafter, a layer of a plurality of leg portions 31, 32, etc. (tip portions T) adjacent to each other in the circumferential direction on the outermost peripheral side of the stator core 2 is referred to as the "first layer", and the layers on the radially inner side are sequentially referred to as the "second layer", "third layer",..., and a layer of a plurality of leg portions 31, 32, etc. adjacent to each other in the circumferential direction on the innermost peripheral side is referred to as the "sixth layer". The number of "layers" in the stator 1 corresponds to the number of leg portions 31, 32, etc. arranged in each slot 2s.

[0022] When assembling to the stator core 2, a plurality of segment coils 30 are arranged in an annular shape by a well-known annular array device (for example, see Japanese Patent No. 3975891) such that adjacent connecting wire portions 33 overlap in the radial direction in a state where they are displaced in the circumferential direction, the tip portions T of the plurality of leg portions 31 are adjacent to each other in the circumferential direction, each leg portion 32 overlaps the corresponding leg portion 31 on the radially inner side, and the tip portions T of the plurality of leg portions 32 are adjacent to each other in the circumferential direction. A plurality of assemblies of segment coils 30 arranged in this annular shape are prepared 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. Then, assemblies of segment coils 30 corresponding to the second and third layers and the fourth and fifth layers are assembled to the stator core 2 from, for example, the anti-lead side, and assemblies of segment coils 30 corresponding to the first and second layers, the third and fourth layers, and the fifth and sixth layers are assembled to the stator core 2 from, for example, the lead side.

[0023] Furthermore, multiple inner-circumferential segment coils are formed to correspond to, for example, the sixth layer on the innermost circumference, with adjacent connecting wires overlapping radially while being offset circumferentially, and the tips of multiple legs arranged in an annular shape so that they are adjacent to each other circumferentially, and are assembled to the stator core 2 from, for example, the non-lead side. In addition, multiple outer-circumferential segment coils are formed to correspond to, for example, the first layer on the outermost circumference, with adjacent connecting wires overlapping radially while being offset circumferentially, and the tips of multiple legs arranged in an annular shape so that they are adjacent to each other circumferentially, and are assembled to the stator core 2 from, for example, the non-lead side. As a result, an annular coil end portion 3R (see Figure 1) is formed on the non-lead side of the stator core 2 by the connecting wires 33 of the multiple segment coils 30 and the connecting wires of the multiple inner segment coils and the multiple outer segment coils, and an annular coil end portion 3L (see Figure 1) is formed by the connecting wires 33 of the multiple segment coils 30.

[0024] As shown in Figures 1 and 3, the tip portions T of legs 31, 32, etc., inserted into the corresponding slots 2s face each other in the axial direction of the stator core 2 with the tip portions T of legs 32 or 31, etc., inserted into the slots 2s from the opposite side, and the opposing tip portions T are electrically connected to each other within the slots 2s via a connecting member 35. The stator coils 3u, 3v, 3w are wound around the stator core 2 by the electrical connection of the corresponding tip portions T of segment coils 30, etc. Furthermore, for example, the legs 31, 32, etc., inserted into the first and second layers or the sixth and fifth layers of a predetermined slot 2s are electrically connected to power lines or a neutral point on the lead side of the stator core 2 via I-shaped segments and busbar units, etc., which are not shown.

[0025] Figure 4 is an enlarged view of the main part showing the connection between the tip portions T of the segment coils 30, etc. in the stator 1, and Figure 5 is a cross-sectional view along the VV line in Figure 4. As shown in these drawings, an insulator (insulating paper) 4 is placed in each slot 2s of the stator core 2. As shown in Figure 5, the insulator 4 is folded into a rectangular cylindrical shape to match the cross-sectional shape of the slot 2s and is inserted into each slot 2s from the non-lead side or lead side of the stator core 2 prior to the assembly of the segment coils 30, etc. The legs 31, 32, etc. of the multiple segment coils 30, etc. are inserted inside the insulator 4 in each slot 2s, and as shown in Figure 4, the legs 31, 32 are arranged alternately in the radial direction inside the insulator 4.

[0026] The connecting member 35 for connecting the tip portions T of the segment coil 30, etc., is a cylindrical body into which the tip portions T are fitted at both ends. In this embodiment, the connecting member 35 is formed in the shape of a rectangular tube with a rectangular cross-section hole using a conductive material, and the outer surface of the connecting member 35 is not coated with an insulating film such as enamel resin. The tip portions T of the leg portions 31, 32, etc. of the segment coil 30, etc., include a thin-walled portion at the tip 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 fit securely into the opening at the end of the connecting member 35, and its tip is chamfered. In contrast, the thick-walled portion is formed to be thicker than the opening width of the connecting member 35 and the thin-walled portion so as not to fit into the end of the connecting member 35.

[0027] When the thin-walled portion of the tip portion T, such as the legs 31 and 32 on the non-lead side, and the thin-walled portion of the tip portion T, such as the legs 32 or 31 on the lead side, are fitted into the corresponding end of the connecting member 35, the two tip portions T, i.e., the two corresponding legs 31 and 32, are electrically connected. On the other hand, the thick-walled portion (conductor) of each tip portion T cannot be fitted into the end of the connecting member 35 and is exposed to the outside of the connecting member 35. As a result, at each connection point between the tip portions T, a conductor exposure portion Cex is formed by the connecting member 35, which does not have an insulating coating, and the two tip portions T, such as the legs 31 and 32, located on both sides in the axial direction of the connecting member 35.

[0028] As shown in Figure 4, each of the multiple exposed conductor portions Cex is positioned within the slot 2s (insulator 4) so ​​as to face the insulating film IL of the adjacent layer, such as the legs 31 or 32, and spaced apart in the axial direction of the stator core 2. That is, the multiple connecting members 35 that connect the tip T of the legs 32 on the non-lead side (lower side in the figure) to the tip T of the legs 31 on the lead side (upper side in the figure) are arranged radially so as to be close to the end face on the non-lead side of the stator core 2 via the legs 31 on the non-lead side. In contrast, the multiple connecting members 35 that connect the tip T of the legs 31 on the non-lead side to the tip T of the legs 32 on the lead side are arranged radially so as to be close to the end face on the lead side of the stator core 2 via the legs 31 on the lead side.

[0029] Here, by positioning each exposed conductor portion Cex at a distance from the adjacent exposed conductor portion Cex in the axial direction of the stator core 2, the occurrence of creepage discharge between adjacent exposed conductor portions Cex can be suppressed. However, from the viewpoint of suppressing an increase in the axial length of the stator core 2, there are limitations on increasing the axial distance between exposed conductor portions Cex. Furthermore, if defects such as pinholes occur in the insulating coating IL of the legs 31, 32, etc., facing the exposed conductor portion Cex, the insulating properties of the exposed conductor portion Cex will be significantly reduced.

[0030] Based on these considerations, as shown in Figures 4 and 5, an epoxy-based thermosetting foam material 50 is placed (filled) inside each slot 2s (insulator 4) so ​​as to cover the exposed conductor portion Cex formed at the connection point between the tip portions T. In this embodiment, as shown in Figure 4, prior to assembling the segment coil 30 etc. to the stator core 2, a thermosetting foam sheet 55 (see dashed line in Figure 4) is attached to the insulating film IL of the legs 31, 32 etc. of the segment coil 30 etc. so as to face radially adjacent exposed conductor portions Cex and the ends of the insulating film IL on both sides in the axial direction of the exposed conductor portion Cex.

[0031] The thermosetting foam sheet 55 comprises a base material and a foam layer made of a thermosetting foam material 50 formed on the front and back surfaces of the base material. The base material of the thermosetting foam sheet 55 is a sheet material made of a heat-resistant and insulating resin material such as polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), or polyimide (PI). The foam layer is an insulating layer made of the epoxy-based foam resin material described above, which expands when heated and then hardens. Furthermore, the foam layer formed on one of the front and back surfaces of the base material is provided with adhesive properties (tackiness).

[0032] As a result, once the assembly of the segment coils 30 and other components to the stator core 2, i.e., the assembly of the stator coils 3u, 3v, and 3w is complete, each exposed conductor portion Cex faces the thermosetting foam sheet 55 on one or both sides in the radial direction of the stator core 2, as shown in Figure 4. After the assembly of the stator coils 3u, 3v, and 3w is complete, each thermosetting foam sheet 55 is heated by applying current to each stator coil 3u, 3v, and 3w, or by heating the stator core 2 with a heater or the like. As a result, as shown in Figures 4 and 5, the thermosetting foam material 50 expands (foams) to cover the exposed conductor portion Cex formed at the connection point between the tip portions T, and hardens to fill each slot 2s.

[0033] As described above, in the stator 1, the corresponding end portions T of the legs 31, 32, etc. of the multiple segment coils 30 are electrically connected to each other within each slot 2s of the stator core 2 via conductive connecting members 35. Then, a thermosetting foam material 50 is placed inside each slot 2s so as to cover the exposed conductor portion Cex formed at the connection point between the end portions T. In other words, during the manufacturing of the stator 1, prior to assembling the multiple segment coils 30, etc. to the stator core 2, a thermosetting foam sheet 55 is attached to the insulating coating IL of the legs 31, 32, etc., thereby placing a foam layer of the thermosetting foam sheet 55 made of the thermosetting foam material 50 around the connection point between the corresponding end portions T of the legs 31, 32, etc. Therefore, by heating each stator coil 3u, 3v, 3w and the stator core 2 after the assembly of the stator coils 3u, 3v, 3w is completed, the thermosetting foam material 50 can be filled into each slot 2s so as to cover the exposed conductor portion Cex formed at the connection point. This makes it possible to ensure good electrical connection between the corresponding tip portions T of the legs 31, 32, etc., while further improving the insulation of the exposed conductor portion Cex formed at the connection between the tip portions T.

[0034] Furthermore, in the stator 1, thermosetting foam sheets 55 are attached to the legs 31, 32, etc. of the segment coils 30, etc., so as to face the radially adjacent exposed conductor portions Cex and the ends of the insulating coating IL on both sides of the exposed conductor portions Cex in the axial direction. This allows the stator coils 3u, 3v, 3w, etc. to be heated after the assembly of the stator coils 3u, 3v, 3w, etc. to foam (expand) the foam layer of the thermosetting foam sheet 55, thereby more reliably covering each exposed conductor portion Cex, and thus ensuring extremely good insulation of each exposed conductor portion Cex.

[0035] Furthermore, the segment coils 30 and the like that form the stator coils 3u, 3v, and 3w are conductors with an insulating coating IL on their surface, and the insulating coating IL is peeled off from the tip portions T of the legs 31, 32, etc. Also, multiple legs 31, 32, etc. are inserted radially in multiple layers from the non-lead side (one end) and lead side (other end) of the stator core 2 into each of the multiple slots 2s. Furthermore, inside each slot 2s, each of the multiple exposed conductor portions Cex is positioned spaced apart in the axial direction of the stator core 2 from the exposed conductor portion Cex of the adjacent layer so as to face the insulating coating IL of the legs 31, 32, etc. of the adjacent layer. This ensures spacing between the exposed conductor portions Cex, so that if thermosetting foam material 50 is filled into each slot 2s to sufficiently cover each exposed conductor portion Cex, it becomes possible to effectively suppress creepage discharge between the exposed conductor portions Cex.

[0036] Furthermore, the corresponding tip portions T of the legs 31, 32, etc. are electrically connected to each other via a connecting member 35 formed of a conductor within the slot 2s. In addition, the exposed conductor portion Cex at the connection between the tip portions T is formed by the connecting member 35 and the two tip portions T of the legs 31, 32, etc. located on both sides of the connecting member 35 in the axial direction. This ensures good electrical connection between the corresponding tip portions T of the legs 31, 32, etc., and makes it possible to omit insulating coatings from the outer surfaces of the numerous connecting members 35 that form the stator coils 3u, 3v, 3w, thereby suppressing an increase in the cost of the stator 1.

[0037] In addition, in the stator 1, instead of attaching the thermosetting foam sheet 55 to the insulating coating IL of the legs 31, 32, etc., the thermosetting foam sheet 55 may be attached to the outer circumferential surface of the connecting member 35, as shown in Figure 6. In this case, prior to assembling the segment coils 30 etc. to the stator core 2, the thermosetting foam sheet 55 is attached to the entire circumference or a part of the outer circumferential surface of each connecting member 35 so as to face the insulating coating IL of the legs 31, 32, etc. of radially adjacent segment coils 30 etc. Even in this embodiment, by heating each stator coil 3u, 3v, 3w etc. after the assembly of the stator coils 3u, 3v, 3w etc. to cause the foam layer of the thermosetting foam sheet 55 to foam, it is possible to ensure extremely good insulation of each conductor exposed portion Cex.

[0038] Furthermore, in the stator 1, the tip portions T of the legs 31, 32, etc., do not necessarily need to be connected via the connecting member 35; the corresponding tip portions T of the legs 31, 32, etc., may be connected by fitting them together. Moreover, in the stator 1, the insulator 4 may include a base material and a foamed layer made of thermosetting foam material 50 formed on the base material. This makes it possible to increase the amount of thermosetting foam material 50 filled in each slot 2s and ensure extremely good insulation of each exposed conductor portion Cex.

[0039] The invention disclosed herein is not limited in any way to the embodiments described above, and it goes without saying that various modifications can be made within the scope of this disclosure. Furthermore, the embodiments described above are merely one specific form of the invention described in the summary section of the invention, and do not limit the elements of the invention described in the summary section of the invention. [Industrial applicability]

[0040] The invention disclosed herein can be used in industries such as the manufacturing of stators and rotating electric machines including said stators. [Explanation of Symbols]

[0041] 1 Stator, 2 Stator core, 2o Center hole, 2s Slot, 2t Teeth, 3L, 3R Coil end, 3u, 3v, 3w Stator coil, 4 Insulator, 30 Segment coil, 31, 32 Legs, 33 Jumper wire, 35 Connecting member, 50 Thermosetting foam material, 55 Thermosetting foam sheet, Cex Conductor exposed part, IL Insulating coating, T Tip.

Claims

1. A stator comprising a stator core including a plurality of slots formed circumferentially spaced apart so as to extend radially, and a plurality of segment coils having a pair of legs inserted into different slots from one end or the other end of the stator core, and forming a stator coil by electrical joining of the tips of the corresponding legs, The corresponding tip portions of the legs are electrically connected within the slot via a conductive connecting member or by fitting together. A stator in which a thermosetting foam material is arranged inside the slot so as to cover the exposed conductor portion formed at the connection point between the tip portions.

2. In the stator according to claim 1, The segment coil is a conductor with an insulating film applied to its surface. The insulating coating has been peeled off from the tip portion of the leg portion. Multiple legs are inserted into each of the multiple slots from one end and the other end of the stator core, arranged in multiple layers in the radial direction. Within the slot, each of the plurality of exposed conductor portions is positioned spaced apart in the axial direction of the stator core from the exposed conductor portion of the adjacent layer, so as to face the insulating coating of the leg portion of the adjacent layer.

3. In the stator according to claim 2, The corresponding tip portions of the legs are electrically connected to each other via the connecting member formed of a conductor within the slot. The exposed conductor portion is a stator formed by the connecting member and the tip portions of the two legs located on both sides of the connecting member in the axial direction.

4. In the stator according to claim 3, A stator in which a thermosetting foam sheet is attached to the leg portion of the segment coil so as to face the radially adjacent exposed conductor portion and the ends of the insulating coating on both sides in the axial direction of the exposed conductor portion.

5. In the stator according to claim 3, A stator in which a thermosetting foam sheet is attached to the outer circumferential surface of the connecting member so as to face the insulating coating of the legs of the radially adjacent segment coils.

Images