Stator

Abstract

The first phase winding (1) has: a first transition (15); and a second transition section (16) that is disposed closer to the second side (L2) in the axial direction than the first transition section (15), and that overlaps the first transition section (15) when viewed in the axial direction. The first transition (15) has a first circumferential region (E1), a second circumferential region (E2), and a connecting region (E3). In the first circumferential region (E1), a first curved section (17) is formed between the first section (K1) and a second section (K2) on the side of the connection region (E3), and the extension angle of the second section (K2) is larger than the extension angle of the first section (K1). In the second circumferential region (E2), a second curved section (18) is formed between the fourth section (K4) and a third section (K3) on the side of the connection region (E3), and the extension angle of the third section (K3) is larger than the extension angle of the fourth section (K4).

Description

Technical Field

[0001] The present invention relates to a stator for a rotating electric machine, comprising: a cylindrical stator core having a plurality of slots arranged in a circumferential direction; and a three-phase winding wound on the stator core and allowing alternating currents of different phases to flow. Background Art

[0002] Japanese Patent Publication No. 2018-88729 discloses a stator (10) having a three-phase winding (stator winding (20)) formed using a segmented conductor (30) composed of a flat wire with a rectangular cross-section (the reference numerals in brackets in the background art are reference numerals of the document). The segmented conductor (30) is formed into a roughly U-shape and has: two accommodating portions (in-slot conductor portions (34, 35)), which are portions corresponding to the sides of the U and are accommodated in groove-shaped slots (18) formed along the axial direction of the stator core (12); and a transition portion (winding end portion (36)), which is a portion corresponding to the bottom of the U and connects the two accommodating portions. The segmented conductor (30) is arranged on the stator core in a state where the transition portion protrudes from the stator core (12) on one axial side of the stator core (12). In addition, on the other axial side of the stator core, a portion corresponding to the lateral end of the U-shape, i.e., a lead portion (32, 33) extending from the accommodating portion, protrudes from the stator core (12). The lead portion (32, 33) is joined to the lead portion (32, 33) of another segment conductor (30) by welding or the like, thereby forming a winding (stator winding (20)).

[0003] The segmented conductor (30) is wound on the stator core (12) in such a manner that the winding (stator winding (20)) is wound on the stator core (12) in multiple turns. That is, a plurality of segmented conductors (30) are arranged radially in one slot (18). Each segmented conductor (30) is arranged in the slot (18) at intervals in such a manner that a plurality of slots (18) are spaced between one of the two accommodating portions (conductor portions (34, 35) in the slot) and the other. At this time, sometimes the accommodating portion on one side and the accommodating portion on the other side are arranged at different positions in the radial direction. If a line that virtually connects the same radial position in the circumferential direction is set as a channel, the segmented conductor is arranged on the stator core (12) in a lane-changing manner, and the lane-changing means that the channel in which one of the two accommodating portions is respectively arranged is changed at the transition portion. For the segmented conductors (30) arranged adjacent to each other in the circumferential direction, one segmented conductor (30) passes over the other segmented conductor (30) at the transition portion (or passes through when viewed from the other side).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-88729 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The transition portion is formed into a mountain shape with a central portion bulging away from the stator core (12). In order to miniaturize the rotating electrical machine, when the stator core (12) is also to be miniaturized, it is necessary to reduce the bending radius when the segmented conductor (30) is bent in the transition portion to form a mountain shape. However, as described above, when the segmented conductor (30) is formed by a flat wire, there is a limit to reducing the bending radius. In addition, if the stator core (12) is miniaturized, the circumferential spacing of the slots (18) also becomes smaller. Therefore, when the segmented conductor (30) on one side of the transition portion passes over or through the segmented conductor (30) on the other side, the segmented conductors (30) sometimes interfere with each other. Such interference can be suppressed by forming the segmented conductor (30) in a manner that the height from the axial end face of the stator core (12) to the top of the transition portion becomes higher. However, in this case, the axial length of the winding end protruding from the axial direction of the stator core (12) becomes longer, which hinders the miniaturization of the stator.

[0009] In view of the above background, it is desired to realize a stator that can avoid interference between segment conductors and achieve miniaturization of the winding end portions.

[0010] Technical means of solving problems

[0011] In view of the above-mentioned stator being a stator for a rotating electric machine, the stator has: a cylindrical stator core having a plurality of slots arranged in a circumferential direction; and a three-phase winding wound on the stator core for passing alternating currents of different phases. The phases of the alternating current are set as the first phase, the second phase, and the third phase in the order of advancement of the phases, the winding for passing the alternating current of the first phase is set as the first phase winding, the winding for passing the alternating current of the second phase is set as the second phase winding, and the winding for passing the alternating current of the third phase is set as the third phase winding, the direction along the axis of the stator core is set as the axial direction, the direction orthogonal to the axis is set as the radial direction, one side of the axial direction is set as the first axial side, the other side of the axial direction is set as the second axial side, one side of the circumferential direction is set as the first circumferential side, and the other side of the circumferential direction is set as the second circumferential side. The first phase winding includes: a first accommodation portion accommodated in the first slot, that is, the first slot; a second accommodation portion accommodated in the second slot, the second slot being the slot adjacent to the first slot on the second side in the circumferential direction; a third accommodation portion accommodated in the third slot, the third slot being the slot separated from the second slot on the second side in the circumferential direction with a plurality of slots therebetween; a fourth accommodation portion accommodated in the fourth slot, the fourth slot being the slot adjacent to the third slot on the second side in the circumferential direction; a first transition portion connecting the first accommodation portion and the fourth accommodation portion on the first side in the axial direction relative to the stator core; and a second transition portion connecting the second accommodation portion and the third accommodation portion on the first side in the axial direction relative to the stator core. The second transition portion is arranged to be located closer to the second side in the axial direction than the first transition portion and overlaps with the first transition portion when viewed in the axial direction along the axial direction. The portion of the second phase winding protruding toward the first axial side relative to the stator core is set as a second phase winding transition portion, and the portion of the third phase winding protruding toward the first axial side relative to the stator core is set as a third phase winding transition portion. The first transition portion includes: a first circumferential region, which is a region on the first circumferential side; a second circumferential region, which is a region located on the second circumferential side relative to the first circumferential region; and a connecting region, which is a region connecting the first circumferential region and the second circumferential region and includes a radial bending portion formed by bending along the radial direction. The first circumferential region includes: a first section, which is on the second axial side relative to the third phase winding transition portion and overlaps with the third phase winding transition portion when viewed in the axial direction; and a second section, which is on the first axial side relative to the second phase winding transition portion and overlaps with the second phase winding transition portion when viewed in the axial direction.The second circumferential region has: a third section, which is on the first axial side relative to the third phase winding transition portion and overlaps with the third phase winding transition portion when viewed in the axial direction; and a fourth section, which is on the second axial side relative to the second phase winding transition portion and overlaps with the second phase winding transition portion when viewed in the axial direction. The first circumferential region is tilted as a whole toward the first axial side as it approaches the second circumferential side, and the second circumferential region is tilted as a whole toward the second axial side as it approaches the second circumferential side, and the angle formed by the extension direction of the first transition portion relative to the circumferential direction is taken as the extension angle, a first curved section with a change in the extension angle is formed between the first section and the second section, and the extension angle of the second section is larger than the extension angle of the first section, and a second curved section with a change in the extension angle is formed between the third section and the fourth section, and the extension angle of the third section is larger than the extension angle of the fourth section.

[0012] According to this structure, by arranging the second transition part at a position closer to the second axial side than the first transition part and overlapping with the first transition part when viewed in the axial direction, the first transition part and the second transition part are not arranged in the radial direction, and the radial dimension of the winding end portion is easily miniaturized. In addition, according to this structure, by making the inclination angle of the second section larger than the inclination angle of the first section, the interference between the first section and the third phase winding transition part arranged on the first axial side in the first section, the interference between the second section and the second phase winding transition part arranged on the second axial side in the second section, the interference between the third section and the third phase winding transition part arranged on the second axial side in the third section, and the interference between the fourth section and the second phase winding transition part arranged on the first axial side in the fourth section can be avoided, and the first transition part and the second transition part can be arranged in a limited circumferential space. Furthermore, by reducing the inclination of the first section and the fourth section, it is easy to suppress the axial length toward the first axial side as it approaches the second circumferential side in the first section to be shorter, and it is easy to suppress the axial length toward the first axial side as it approaches the first circumferential side in the fourth section to be shorter. That is, as a whole, the length of the transition portion toward the first axial side, that is, the axial height of the winding can be suppressed to be low. Therefore, it is easy to miniaturize the axial dimension of the winding end. Thus, according to this structure, a stator can be realized that can avoid interference between segment conductors and miniaturize the winding end.

[0013] Further features and advantages of the stator of the rotating electrical machine will become apparent from the following description of the exemplary and non-limiting embodiments explained with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing the appearance of the stator.

[0015] Figure 2 This is a schematic circuit block diagram showing an example of electrical connection to the winding.

[0016] Figure 3 FIG. 1 is a diagram schematically showing a basic structure of a segment conductor.

[0017] Figure 4 is a top view of the stator viewed from a first axial side.

[0018] Figure 5 This is an enlarged perspective view of the stator viewed from the radial inside with the innermost segment conductor removed.

[0019] Figure 6 It is an enlarged development view in a circumferential direction showing an arrangement example of the segment conductors as viewed from the radial inner side.

[0020] Figure 7 It is an explanatory diagram showing the extension angle of the segment conductor.

[0021] Figure 8 It is an enlarged plan view showing an arrangement example of the segment conductors viewed from the first side in the axial direction.

[0022] Fig. 9 It is a partial perspective view showing an arrangement example of segment conductors according to a comparative example.

[0023] Fig.10 It is a partial plan view showing an arrangement example of the segment conductors of the comparative example as viewed from the first side in the axial direction. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of a stator for a rotating electrical machine will be described based on the drawings. Figure 1 The three-dimensional view shows the stator 8 with the winding 84 (stator winding) wound on the stator core 80. In the following description, "axial direction L", "radial direction R" and "circumferential direction C" are defined based on the axis X of the stator core 80 with the winding 84 wound on it. Figure 1 As shown, one side in the axial direction L is set as the axial first side L1, and the other side in the axial direction L (the side opposite to the axial first side L1) is set as the axial second side L2. In addition, one side in the circumferential direction C is set as the circumferential first side C1, and the other side in the circumferential direction C (the side opposite to the circumferential first side C1) is set as the circumferential second side C2. In addition, in the following description, each direction about the winding 84 and the segment conductor 4 forming the winding 84 is the direction in the state where the winding 84 is wound on the stator core 80.

[0025] like Figure 2As shown, an inverter INV is provided as an AC power source for supplying AC power to the rotating electric machine (stator 8). The inverter INV is connected between the DC power source 91 and the winding 84, and converts power between DC power and multi-phase (here, three-phase) AC power. The inverter INV is configured to have a plurality of switching elements. The rotating electric machine can function as both a motor and a generator. When it functions as a generator, the generated AC power is converted into DC power by the inverter INV and supplied to the DC power source 91. The DC power source 91 is composed of, for example, a secondary battery (battery) such as a nickel-metal hydride battery or a lithium-ion battery, or a double-layer capacitor. When the rotating electric machine is a driving force source for the vehicle, the DC power source 91 is a high-voltage and high-capacity power source, and the rated power supply voltage is, for example, 200 to 400 [V]. On the DC side of the inverter INV, there is a DC support capacitor 92 (smoothing capacitor) for smoothing the voltage (DC link voltage) on the DC side of the inverter INV. The DC link capacitor 92 stabilizes the DC voltage (DC link voltage) that varies in accordance with the variation in power consumption of the rotating electrical machine.

[0026] like Figure 2 As shown, in the present embodiment, the winding 84 is a Y-shaped connection type in which each phase of the three phases (U phase, V phase, W phase) is connected at the neutral point. It will be described in detail later, but the windings of each phase of the three phases (here, the first phase winding 1, the second phase winding 2, and the third phase winding 3) are electrically connected to each other through the neutral point bus 88. In addition, the windings of each phase of the three phases are electrically connected to the three-phase AC output of the inverter INV through the power line bus 87. In addition, the first phase winding 1 can be any one of the U phase, V phase, and W phase, and the second phase winding 2 and the third phase winding 3 are also the same, according to which the first phase winding 1 corresponds to any one of the U phase, V phase, and W phase.

[0027] like Figure 1As shown, the winding 84 is wound on the stator core 80, and the stator core 80 is formed with a plurality of slots S and teeth T extending in the axial direction L in the circumferential direction C. The stator core 80 has a yoke Y formed in an annular shape when viewed in the axial direction L and a plurality of teeth T extending from the yoke Y to the radial inner side R1 (in this embodiment, the side where the rotor not shown in the figure is arranged). Moreover, between two teeth T adjacent to each other in the circumferential direction C, a groove-shaped slot S having a bottom on the radial outer side R2 is formed. In this embodiment, the slot S is a semi-open slot, and the opening portion of the radial inner side R1 of the slot S is formed to have a width in the circumferential direction C that is smaller than the area in the slot S where the winding 84 is arranged. Here, the width of the opening portion of the slot S in the circumferential direction C is formed to be smaller than the long side length W1 described later. The stator core 80 is formed using a magnetic material. For example, the stator core 80 is formed by stacking a plurality of magnetic plates (e.g., electromagnetic steel plates such as silicon steel plates). Alternatively, the stator core 80 is formed using a powder material obtained by compacting magnetic material powder as a main structural member.

[0028] The winding 84 has a plurality of accommodation portions (the first end side accommodation portion 41, the second end side accommodation portion 42, and the specific accommodation portion 63 described later) respectively arranged in the slot S. In the present embodiment, the accommodation portions are arranged in the slot S in a manner extending parallel to the axial direction L. The winding 84 regards the arrangement area of ​​the radial direction R of one accommodation portion as one layer, as shown in FIG. Figure 1 and Figure 4 As shown in FIG. 1 and FIG. 2 , a plurality of accommodating portions are arranged in layers inside one slot S. In the present embodiment, the winding 84 has a six-layer winding structure, and the plurality of accommodating portions are arranged in a row along the radial direction R in six layers inside one slot S. Therefore, in the present embodiment, a maximum of six accommodating portions are arranged in a row in the radial direction R inside one slot S.

[0029] The winding 84 is formed by Figure 3 The segment conductors 4 shown are formed by joining together. Each segment conductor 4 has lead portions (first lead portion 43, second lead portion 44) at both ends in the extending direction of the segment conductor 4. The winding 84 is formed by sequentially joining together the lead portions of a plurality of segment conductors 4.

[0030] Each segment conductor 4 is formed by using a continuous linear conductor. Here, "continuous" means that it is formed integrally without gaps in the extension direction. The linear conductor is made of a conductive material such as copper and aluminum. The surface of the linear conductor is covered with an insulating film made of an electrically insulating material such as resin (for example, enamel resin made of polyamide-imide, etc.), except for the electrical connection parts between different components.

[0031] like Figure 3As shown, in this embodiment, as the linear conductor constituting the segment conductor 4, a linear conductor (flat wire) whose cross-section is orthogonal to the extension direction is a rectangular shape (rectangular in this embodiment). In this embodiment, the cross-sectional shape of the segment conductor 4 is a rectangle with a long side length W1 and a short side length W2. In addition, the cross-sectional shape is not excluded, and further includes a rectangular shape whose corners are chamfered (R chamfer) into an arc shape or chamfered (C chamfer) into a straight line shape, and the absolute value of the difference between the size of the internal angle and 90 degrees is less than a preset angle (for example, 5 degrees, 10 degrees, etc.).

[0032] The segment conductor 4 includes: the general segment conductors 5, which are continuously joined to each other as described above to form a plurality of winding main bodies 83 as the core of the winding 84; and the specific segment conductors 6, which are joined to the ends of the winding main bodies 83. In the present embodiment, the specific segment conductors 6 are segment conductors 4 that connect the power line bus bar 87 for supplying AC power from the inverter INV to the winding main bodies 83, or connect the neutral point bus bar 88 forming the neutral point of the winding 84 to the neutral points of the plurality of winding main bodies 83.

[0033] Figure 3 FIG. 4 schematically shows a general segmented conductor 5 as a representative of the segmented conductor 4. The general segmented conductor 5 has a substantially U-shaped shape. Figure 3 As shown, the long side side of the rectangular cross section is the front side of the U-shaped shape, and the short side side of the rectangular cross section is the side side. Figures 4 to 8 In addition to the above, the segment conductor 5 is generally formed into a U-shape by bending the edge of the short side.

[0034] Each of the segment conductors 4 has a first lead portion 43 and a second lead portion 44 at the ends on both sides of the extending direction of the segment conductor 4. The first lead portion 43 and the first end side accommodation portion 41 are formed continuously and linearly in a portion extending linearly on the first lead portion 43 side in the substantially U-shaped shape, and the second lead portion 44 and the second end side accommodation portion 42 are formed continuously and linearly in a portion extending linearly on the second lead portion 44 side. A transition portion 40 is formed at the bottom of the substantially U-shaped shape so as to connect the first end side accommodation portion 41 and the second end side accommodation portion 42. The above-mentioned bent portion 49 is formed in the center of the transition portion 40. The bent portion 49 is formed by bending a plane whose long side is bent.

[0035] The first end side accommodation portion 41 and the second end side accommodation portion 42 are portions accommodated in the slots S of the stator core 80. In addition, the interval between the first end side accommodation portion 41 and the second end side accommodation portion 42 in the circumferential direction C is N times (N is a natural number) the interval between the adjacent slots S in the circumferential direction C. In this embodiment, N=6 or N=4 (see Figure 6 etc.). In addition, as described above, the segment conductor 4 regards the configuration area of ​​the radial direction R of one accommodation portion (the first end side accommodation portion 41, the second end side accommodation portion 42, etc.) as one layer, and the plurality of accommodation portions are arranged in six layers inside one slot S. That is, inside one slot S, the plurality of accommodation portions are arranged in a row along the radial direction R. Therefore, the interval in the circumferential direction C is different between the radial inner side R1 and the radial outer side R2. Therefore, the interval in the circumferential direction C between the first end side accommodation portion 41 and the second end side accommodation portion 42 of the segment conductor 4 arranged on the radial outer side R2 is wider than the interval in the circumferential direction C between the first end side accommodation portion 41 and the second end side accommodation portion 42 of the segment conductor 4 arranged on the radial inner side R1.

[0036] The segment conductor 4 is inserted into the slot S from the first lead portion 43 and the second lead portion 44 side along the axial direction L from the first axial side L1 toward the second axial side L2 relative to the stator core 80. The transition portion 40 is a portion that protrudes toward the first axial side L1 of the stator core 80 when the first end side accommodation portion 41 and the second end side accommodation portion 42 of the segment conductor 4 are accommodated in the slot S. In addition, the first lead portion 43 and the second lead portion 44 are portions that protrude toward the second axial side L2 of the stator core 80 when the first end side accommodation portion 41 and the second end side accommodation portion 42 of the segment conductor 4 are accommodated in the slot S. The protruding first lead portion 43 and the second lead portion 44 are as shown in FIG. Figure 3 As shown by the two-dot chain line, the first lead portion 43 and the second lead portion 44 are bent in the circumferential direction C and joined to the lead portion of the other segment conductor 4 by welding or the like. In the transition portion 40 , the first lead portion 43 and the second lead portion 44 correspond to the joining portion 45 .

[0037] In this way, the protruding portions of the winding 84, i.e., so-called winding ends, are formed on the axial first side L1 and the axial second side L2 of the stator core 80. When distinguishing between the two, the winding end formed by the transition portion 40 on the axial first side L1 is referred to as the first winding end 85, and the winding end formed by the joint portion 45 on the axial second side L2 is referred to as the second winding end 86. The length from the axial first side end face 81 of the stator core 80 to the portion of the transition portion 40 that most protrudes toward the axial first side L1 is equivalent to the axial length L of the first winding end 85. In addition, the length from the axial second side end face 82 of the stator core 80 to the portion of the joint portion 45 that most protrudes toward the axial second side L2 is equivalent to the axial length L of the second winding end 86.

[0038] The winding 84 includes, in addition to the general segment conductors 5 forming the winding main body 83, a power line bus 87 connecting the winding main body 83 and a power source (in this case, an inverter INV that supplies AC power) and a specific segment conductor 6 electrically connected to a neutral point bus 88 that connects different phases in the winding main body 83. Figure 1 As shown, the specific segment conductor 6 comprises: a specific accommodation portion 63 accommodated in the slot S of the stator core 80; an axially extending portion 64 extending axially relative to the stator core 80; and a radially extending portion 65 extending in the radial direction R closer to the axial first side L1 than the transition portion 40 of the general segment conductor 5 and closer to the radial outer side R2 than the axially extending portion 64.

[0039] In addition, the plurality of specific segment conductors 6 include: a plurality of power line conductors 61 connected to an AC power source (inverter INV in this case); and a plurality of neutral point conductors 62 for connecting neutral points of the plurality of winding main bodies 83. The radially extending portions 65 of the plurality of power line conductors 61 are arranged on the first axial side L1 relative to the radially extending portions 65 of the plurality of neutral point conductors 62.

[0040] As described above, each segment conductor 4 (generally, segment conductor 5) is arranged in the slot S at intervals in a manner that a plurality of slots S are interposed between two accommodation portions (first end side accommodation portion 41 and second end side accommodation portion 42). At this time, the first end side accommodation portion 41 and the second end side accommodation portion 42 are arranged at different positions in the radial direction R. That is, the first end side accommodation portion 41 and the second end side accommodation portion 42 may be arranged in different layers (see Figure 4 ). If the layers formed by connecting the same positions in the radial direction R in the circumferential direction C are assumed to be the channels of the winding 84 extending in the circumferential direction C, the segment conductor 4 is arranged in the stator core 80 (see Figure 4 , Figure 5 Therefore, if Figure 5 As shown in FIG. 1 and FIG. 2 , the segment conductors 4 arranged adjacent to each other in the circumferential direction C have one segment conductor 4 passing over or through the other segment conductor 4 at the transition portion 40 .

[0041] The transition portion 40 is formed in a mountain shape with the center portion bulging in a direction away from the stator core 80. When the rotating electric machine is miniaturized, the stator core 80 also needs to be miniaturized, and sometimes the bending radius when the segment conductor 4 is bent in the transition portion 40 to form a mountain shape needs to be reduced. However, as described above, when the segment conductor 4 is formed of a flat wire and formed into a U-shape by bending the edge, for example, there is a limit to the reduction of the bending radius due to the strength problem caused by the relationship with the bending stress of the conductor and the problem of ensuring insulation in consideration of the influence on the insulation coating.

[0042] In addition, if the stator core 80 is miniaturized, the intervals of the slots S in the circumferential direction C also become smaller. Therefore, in the transition portion 40, when one segment conductor 4 passes over or through another segment conductor 4, Fig. 9 and Fig.10 As shown in the comparative example of , the segment conductors 4 may interfere with each other in the interference region F. For example, the segment conductors 4 may be formed so that the height from the axial end face of the stator core 80 (here, the axial first side end face 81) to the top of the transition portion 40 becomes higher, so that the segment conductors 4 can be easily passed through, thereby suppressing such interference. However, in this case, the length of the axial direction L of the winding end (here, the first winding end 85) protruding in the axial direction L of the stator core 80 becomes longer, which hinders the miniaturization of the stator 8.

[0043] Therefore, in the present embodiment, the shape of the segment conductors 4 (general segment conductors 5 ) is devised to achieve the stator 8 which can avoid interference between the segment conductors 4 and achieve miniaturization of the winding end (first winding end 85 ).

[0044] As described above, the stator 8 of the present embodiment includes: a cylindrical stator core 80 having a plurality of slots S arranged in a circumferential direction C; and a three-phase winding 84 wound on the stator core 80, through which alternating currents of different phases flow. Here, the phases of the alternating current are set to the first phase, the second phase, and the third phase in the order of advancement of the phases (for example, "U phase, V phase, W phase", "V phase, W phase, U phase", "W phase, U phase, V phase"), and the winding 84 through which the alternating current of the first phase flows is set to the first phase winding 1, the winding 84 through which the alternating current of the second phase flows is set to the second phase winding 2, and the winding 84 through which the alternating current of the third phase flows is set to the third phase winding 3.

[0045] This will be discussed in detail later, but Figure 6As shown, the first phase winding 1 has: a first accommodating portion 11, which is accommodated in the first slot S1; a second accommodating portion 12, which is accommodated in the second slot S2, and the second slot S2 is a slot S adjacent to the first slot S1 on the second circumferential side C2; ​​a third accommodating portion 13, which is accommodated in the third slot S3, and the third slot S3 is a slot S separated from the second slot S2 and arranged on the second circumferential side C2 with a plurality of slots S between them; a fourth accommodating portion 14, which is accommodated in the fourth slot S4, and the fourth slot S4 is a slot S adjacent to the third slot S3 on the second circumferential side C2; ​​a first transition portion 15, which connects the first accommodating portion 11 and the fourth accommodating portion 14 on the first axial side L1 relative to the stator core 80; and a second transition portion 16, which connects the second accommodating portion 12 and the third accommodating portion 13 on the first axial side L1 relative to the stator core 80. The winding method of the winding 84 is not limited to this, but in Figure 6 In the example shown, the winding 84 is wound with a short pitch. Here, the third slot S3 and the second slot S2 are arranged with three slots S between them. Furthermore, the first transition portion 15 connects the first accommodation portion 11 and the fourth accommodation portion 14 which are arranged at six slot intervals, and the second transition portion 16 connects the second accommodation portion 12 and the third accommodation portion 13 which are arranged at four slot intervals.

[0046] In addition, when the first transition portion 15 and the second transition portion 16 are collectively referred to, they are referred to as the first phase winding transition portion 10. The first phase winding 1 has a first first phase winding 1a and a second first phase winding 1b, the first transition portion 15 is the first phase winding transition portion 10 of the first first phase winding 1a, and the second transition portion 16 is the first phase winding transition portion 10 of the second first phase winding 1b. The second transition portion 16 is closer to the second axial side L2 than the first transition portion 15, and is configured to overlap with the first transition portion 15 when viewed axially. In the present embodiment, an example is given in which the entire second transition portion 16 overlaps with the first transition portion 15 when viewed axially. However, it is also possible that only a portion of the second transition portion 16 overlaps with the first transition portion 15 when viewed axially.

[0047] In this way, the second transition portion 16 is arranged at a position closer to the second axial side L2 than the first transition portion 15 and overlaps with the first transition portion 15 when viewed axially. The first transition portion 15 and the second transition portion 16 are not arranged in the radial direction R, which makes it easy to miniaturize the radial dimension of the first winding end 85.

[0048] In addition, the portion of the second phase winding 2 that protrudes toward the first axial side L1 relative to the stator core 80 is set as the second phase winding transition portion 20, and the portion of the third phase winding 3 that protrudes toward the first axial side L1 relative to the stator core 80 is set as the third phase winding transition portion 30. Similar to the first phase winding 1, the second phase winding 2 also includes the first second phase winding 2a and the second second phase winding 2b, and the third phase winding 3 also includes the first third phase winding 3a and the second third phase winding 3b. Moreover, the first second phase winding 2a and the second second phase winding 2b each include the second phase winding transition portion 20, and the first third phase winding 3a and the second third phase winding 3b each include the third phase winding transition portion 30.

[0049] The first transition portion 15 includes: a first circumferential region E1, which is a region on the first circumferential side C1; a second circumferential region E2, which is a region located on the second circumferential side C2 relative to the first circumferential region E1; and a connecting region E3, which is a region connecting the first circumferential region E1 and the second circumferential region E2 and includes a radial bend portion 19 formed by bending along the radial direction R.

[0050] The first circumferential region E1 includes: a first section K1, which overlaps with the third phase winding transition section 30 on the second axial side L2 relative to the third phase winding transition section 30 when viewed in the axial direction; and a second section K2, which overlaps with the second phase winding transition section 20 on the first axial side L1 relative to the second phase winding transition section 20 when viewed in the axial direction. In addition, a section (K20) in which the first transition section 15 overlaps with the second phase winding transition section 20 on the first axial side L1 relative to the second phase winding transition section 20 when viewed in the axial direction also exists in the connection region E3. The second section K2 is set as a part of the section (K20).

[0051] In addition, the second circumferential region E2 has: a third section K3, which overlaps with the third phase winding transition section 30 on the first axial side L1 relative to the third phase winding transition section 30 when viewed in the axial direction; and a fourth section K4, which overlaps with the second phase winding transition section 20 on the second axial side L2 relative to the second phase winding transition section 20 when viewed in the axial direction. In addition, a section (K30) in which the first transition section 15 overlaps with the third phase winding transition section 30 on the first axial side L1 relative to the third phase winding transition section 30 when viewed in the axial direction also exists in the connection region E3. The third section K3 is set as a part of the section (K30).

[0052] The first circumferential region E1 is inclined as a whole toward the axial first side L1 as it goes toward the circumferential second side C2, and the second circumferential region E2 is inclined as a whole toward the axial second side L2 as it goes toward the circumferential second side C2. Here, the angle formed by the extension direction of the first transition portion 15 with respect to the circumferential direction C is referred to as the extension angle.

[0053] like Figure 6 As shown in FIG. 1 , a first curved portion 17 where the extension angle of the first transition portion 15 changes is formed between the first section K1 and the second section K2. The first curved portion 17 is formed by bending the edge of the short side of the segment conductor 4 along the axial direction L. The extension angle of the second section K2 is greater than that of the first section K1. That is, Figure 7 As shown, the extension angle of the first transition portion 15 closer to the second circumferential side C2 than the first bend portion 17 (the extension angle in the second interval K2), i.e., the second extension angle θ2, is greater than the extension angle of the first transition portion 15 closer to the first circumferential side C1 than the first bend portion 17 (the extension angle in the first interval K1), i.e., the first extension angle θ1.

[0054] In addition, if Figure 6 As shown in FIG. 1 , a second curved portion 18 is formed between the third section K3 and the fourth section K4, where the extension angle of the first transition section 15 changes. The second curved portion 18 is formed by bending the edge of the short side of the segment conductor 4 along the axial direction L. The extension angle of the third section K3 is greater than that of the fourth section K4. That is, Figure 7 As shown, the extension angle of the first transition portion 15 closer to the first circumferential side C1 than the second bend portion 18 (the extension angle in the third interval K3), i.e., the third extension angle θ3, is greater than the extension angle of the first transition portion 15 closer to the second circumferential side C2 than the second bend portion 18 (the extension angle in the fourth interval K4), i.e., the fourth extension angle θ4.

[0055] In addition, in the present embodiment, the shape of the first transition portion 15 is symmetrical when viewed in the radial direction, the first extension angle θ1 and the fourth extension angle θ4 are the same angle (θ10), and the second extension angle θ2 and the third extension angle θ3 are the same angle (θ20). That is, the extension angle of the first transition portion 15 on the axial first side L1 relative to the first curved portion 17 and the second curved portion 18, i.e., the axial first side extension angle θ20, is greater than the extension angle of the first transition portion 15 on the axial second side L2 relative to the first curved portion 17 and the second curved portion 18, i.e., the axial second side extension angle θ10.

[0056] In addition, the shape of the first transition portion 15 is not necessarily symmetrical when viewed in the radial direction. That is, as for the extension angle, as long as the relationship of "θ2>θ1" and "θ3>θ4" is satisfied, the first extension angle θ1 and the fourth extension angle θ4 may not be the same angle (axial second side extension angle θ10). Similarly, the second extension angle θ2 and the third extension angle θ3 may not be the same angle (axial first side extension angle θ20).

[0057] By making the second extension angle θ2, which is the inclination angle (extension angle) of the second section K2, greater than the first extension angle θ1, which is the inclination angle of the first section K1, the position of the first section K1 in the axial direction L is retracted toward the second axial side L2. As a result, it is easy to ensure a space between the third phase winding transition portion 30 arranged on the first axial side L1 in the first section K1 and the first section K1 (first transition portion 15), and it is easy to avoid interference between the first section K1 and the third phase winding transition portion 30 arranged on the first axial side L1 in the first section K1.

[0058] In addition, by making the inclination angle (extension angle) of the second section K2, i.e., the second extension angle θ2, greater than the inclination angle of the first section K1, i.e., the first extension angle θ1, the position of the second section K2 in the axial direction L moves toward the axial first side L1, and therefore, the second transition portion 16 arranged closer to the axial second side L2 than the second section K2 can also move toward the axial first side L1. As a result, it is easy to ensure the space between the second phase winding transition portion 20 arranged on the axial second side L2 relative to the second section K2 and the area (section) of the second transition portion 16 overlapping with the second section K2 when viewed axially, and the second section K2 and the area (section) of the second transition portion 16 overlapping with the second section K2 when viewed axially. Therefore, it is easy to avoid interference between the second section K2 and the second phase winding transition portion 20 arranged on the axial second side L2 in the second section K2.

[0059] In addition, by making the inclination angle (extension angle) of the third section K3, i.e., the third extension angle θ3, greater than the inclination angle of the fourth section K4, i.e., the fourth extension angle θ4, the position of the third section K3 in the axial direction L moves toward the axial first side L1, and therefore, the second transition portion 16 arranged closer to the axial second side L2 than the third section K3 can also move toward the axial first side L1. As a result, it is easy to ensure the space between the third phase winding transition portion 30 arranged on the axial second side L2 relative to the third section K3 and the area (section) of the second transition portion 16 overlapping with the third section K3 when viewed in the axial direction, and the third section K3 and the area (section) of the second transition portion 16 overlapping with the third section K3 when viewed in the axial direction. Therefore, it is easy to avoid interference between the third section K3 and the third phase winding transition portion 30 arranged on the axial second side L2 in the third section K3.

[0060] In addition, by making the inclination angle (extension angle) of the third section K3, namely the third extension angle θ3, greater than the inclination angle of the fourth section K4, namely the fourth extension angle θ4, the position of the fourth section K4 in the axial direction L is retracted toward the axial second side L2. As a result, it is easy to ensure the space between the second phase winding transition portion 20 arranged on the axial first side L1 in the fourth section K4 and the fourth section K4 (first transition portion 15), and it is easy to avoid the interference between the fourth section K4 and the second phase winding transition portion 20 arranged on the axial first side L1 in the fourth section K4.

[0061] That is, according to this embodiment, interference between the first phase winding 1 and the second phase winding 2 and interference between the first phase winding 1 and the third phase winding 3 can be avoided, and the first jumper portion 15 and the second jumper portion 16 can be arranged in a limited space in the circumferential direction C.

[0062] In addition, Fig. 9 In the illustrated comparative example, the inclination angle (extending angle) at the transition portion 40 is constant and does not change. The axial second side extending angle θ10 (the first extending angle θ1, the fourth extending angle θ4) is less than Fig. 9 The extension angle (θ9) of the transition portion 40 in the illustrated comparative example, the axial first side extension angle θ20 (the second extension angle θ2, the third extension angle θ3) is greater than the extension angle (θ9) of the transition portion 40 in the comparative example. Therefore, in the comparative example, as described above, when the transition portion 40 passes over or through other transition portions 40, there is a case where sufficient space cannot be ensured and the transition portions 40 interfere with each other in the interference region F. However, in the present embodiment, when two segment conductors 4 cross each other, the interference between the segment conductors 4 can be avoided, and the length of the transition portion 40 in the axial direction L can be suppressed compared to the comparative example.

[0063] Furthermore, by reducing the inclination angles of the first section K1 and the fourth section K4, it is easy to suppress the length of the axial direction L toward the first axial side L1 toward the second circumferential side C2 in the first section K1, and it is easy to suppress the length of the axial direction L toward the first axial side L1 toward the first circumferential side C1 in the fourth section K4. That is, as a whole, the length toward the first axial side L1 of the transition portion 40, that is, the height of the axial direction L of the winding 84 can be suppressed to be low. Therefore, it is easy to miniaturize the dimension of the axial direction L of the first winding end 85.

[0064] In the above description, the first section K1, the second section K2, the third section K3, the fourth section K4, etc. are partially overlapped when viewed in the axial direction. However, the overlap in the definition of these sections is not limited to partial overlap, but also includes full overlap.

[0065] In addition, if Figure 6 (Although Figure 5 The interval is not shown in the figure, but it is referenced when observing in three dimensions. Figure 5 ), the first interval K1 is configured to be radially inside R1 relative to the second phase winding transition portion 20 and overlap with the second phase winding transition portion 20 when viewed radially. In addition, the second interval K2 is configured to be radially inside R1 relative to the third phase winding transition portion 30 and overlap with the third phase winding transition portion 30 when viewed radially. In addition, the third interval K3 is configured to be radially outside R2 relative to the second phase winding transition portion 20 and overlap with the second phase winding transition portion 20 when viewed radially. In addition, the fourth interval K4 is configured to be radially outside R2 relative to the third phase winding transition portion 30 and overlap with the third phase winding transition portion 30 when viewed radially. In addition, here, the focus is on the second phase winding 2 and the third phase winding 3 that are configured in the same layer as the first phase winding 1 (here, two layers adjacent in the radial direction R).

[0066] Thus, according to this embodiment, the first transition portion 15 and the second transition portion 16 of the first phase winding 1, the second phase winding transition portion 20, and the third phase winding transition portion 30 can be appropriately arranged in a limited space. Therefore, the first winding end portion 85 of the stator 8 can be easily miniaturized.

[0067] In addition, if Figure 6 As shown, the connection region E3 is arranged along the circumferential direction C as a whole, and the radially curved portion 19 is arranged at a position that does not overlap with both the second phase winding transition portion 20 and the third phase winding transition portion 30 when viewed in the radial direction.

[0068] By configuring in this way, it is easy to achieve miniaturization of the radial direction R of the first winding end portion 85, compared with a case where the radially bent portion 19 is arranged to overlap with at least one of the second phase winding transition portion 20 and the third phase winding transition portion 30 when viewed in the radial direction. In addition, in the present embodiment, the radially bent portion 19 formed in the connection area E3 is formed only by bending in the radial direction R, and the segment conductor 4 is not bent in the axial direction L. That is, the bent portion can be formed in a manner that the bending directions of the segment conductor 4 in the connection area E3 are not combined (in a manner that the edge bending and the plane bending are not combined), so that the mechanical load on the insulating film applied to the surface of the segment conductor 4 is not easy to increase, and it is easy to ensure insulation.

[0069] As described above, the conductor constituting the winding 84 is a covered conductor wire having a rectangular cross section and an insulating coating formed on the surface. The rectangular wire is easy to increase the space factor compared to the round wire, and the stator 8 is easy to be miniaturized accordingly. In addition, by having the insulating coating, it is easy to ensure insulation and to wind the stator core 80 on the winding 84 with a high space factor. In addition, the rectangular wire is easy to maintain the formed shape, so, for example, it is easy to form the first transition portion 15 and the second transition portion 16 of the first phase winding 1, the second phase winding transition portion 20, and the third phase winding transition portion 30 into a certain shape, and it is easy to arrange them in a limited space and appropriately configure them.

[0070] As described above, the cross-section of the conductor constituting the winding 84 in the first transition portion 15 and the second transition portion 16 is a rectangular shape in which the dimension in the axial direction L (long side length W1) is larger than the dimension in the radial direction R (short side length W2). Therefore, the first curved portion 17 and the second curved portion 18 are axial curved portions curved along the axial direction L.

[0071] The first curved portion 17 and the second curved portion 18 are not curved in the radial direction R, thereby preventing the stator winding end from becoming larger in the radial direction. In addition, by making the first curved portion and the second curved portion curved in the axial direction, the axial length of the first transition portion is shortened. Therefore, it is easy to achieve miniaturization of the stator winding end.

[0072] In the above description, the winding 84 formed using the segment conductor 4 (generally the segment conductor 5) and the stator 8 having the winding 84 are described using the first phase winding 1 as a representative, based on the relationship with the second phase winding 2 and the third phase winding 3. The first phase winding 1, the second phase winding 2, and the third phase winding 3 have the same structure, and the second phase winding 2 and the third phase winding 3 are also represented by the first phase winding 1, and the same method as described above is used.

[0073] [Summary of this embodiment]

[0074] The stator (8) described above will be briefly summarized below.

[0075] In view of the above-mentioned stator (8) being a stator (8) for a rotating electric machine, it comprises: a cylindrical stator core (80) having a plurality of slots (S) arranged along a circumferential direction (C); and a three-phase winding (84) wound on the stator core (80) for allowing alternating currents of different phases to flow. The phases of the alternating current are set to be the first phase, the second phase, and the third phase in the order of advancement of the phases; the winding (84) through which the alternating current of the first phase flows is set to be the first phase winding (1); the winding (84) through which the alternating current of the second phase flows is set to be the second phase winding (2); the winding (84) through which the alternating current of the third phase flows is set to be the third phase winding (3); the direction along the axis (X) of the stator core (80) is set to be the axial direction (L); the direction orthogonal to the axis (X) is set to be the radial direction (R); one side of the axial direction (L) is set to be the first axial side (L1); the other side of the axial direction (L) is set to be the second axial side (L2); one side of the circumferential direction (C) is set to be the first circumferential side (C1); and the other side of the circumferential direction (C) is set to be the second circumferential side (C2). The first phase winding (1) comprises: a first accommodating portion (11) accommodating a first slot (S), namely a first slot (S1); a second accommodating portion (12) accommodating a second slot (S2), wherein the second slot (S2) is the slot (S) adjacent to the first slot (S1) on the second circumferential side (C2); a third accommodating portion (13) accommodating a third slot (S3), wherein the third slot (S3) is the slot (S) separated from the second slot (S2) by a plurality of slots (S) on the second circumferential side (C2); A fourth receiving portion (14) is received in a fourth slot (S4), the fourth slot (S4) being the slot (S) adjacent to the third slot (S3) on the second circumferential side (C2); a first transition portion (15) connecting the first receiving portion (11) and the fourth receiving portion (14) on the first axial side (L1) relative to the stator core (80); and a second transition portion (16) connecting the second receiving portion (12) and the third receiving portion (13) on the first axial side (L1) relative to the stator core (80). The second transition portion (16) is configured to be located closer to the second axial side (L2) than the first transition portion (15) and overlap the first transition portion (15) when viewed in the axial direction of the axial direction (L). The portion of the second phase winding (2) that protrudes toward the first axial side (L1) relative to the stator core (80) is set as a second phase winding transition portion (20), and the portion of the third phase winding (3) that protrudes toward the first axial side (L1) relative to the stator core (80) is set as a third phase winding transition portion (30).The first transition portion (15) comprises: a first circumferential region (E1), which is a region on the first circumferential side (C1); a second circumferential region (E2), which is a region located on the second circumferential side (C2) relative to the first circumferential region; a connecting region (E3), which is a region connecting the first circumferential region (E1) and the second circumferential region (E2) and includes a radial bending portion (19) formed by bending along the radial direction (R). The first circumferential region (E1) comprises: a first section (K1), which is on the second axial side (L2) relative to the third phase winding transition portion (30) and overlaps with the third phase winding transition portion (30) when viewed in the axial direction; and a second section (K2), which is on the first axial side (L1) relative to the second phase winding transition portion (20) and overlaps with the second phase winding transition portion (20) when viewed in the axial direction. The second circumferential region (E2) comprises: a third section (K3), which is on the first axial side (L1) relative to the third phase winding transition section (30) and overlaps with the third phase winding transition section (30) when viewed in the axial direction; and a fourth section (K4), which is on the second axial side (L2) relative to the second phase winding transition section (20) and overlaps with the second phase winding transition section (20) when viewed in the axial direction. The first circumferential region (E1) is integrally inclined in a manner toward the first axial side (L1) as it moves toward the second circumferential side (C2), and the second circumferential region (E2) is integrally inclined in a manner toward the second axial side (L2) as it moves toward the second circumferential side (C2). The angle formed by the extension direction of the first transition portion (15) relative to the circumferential direction (C) is taken as the extension angle. A first curved portion (17) at which the extension angle changes is formed between the first section (K1) and the second section (K2), and the extension angle of the second section (K2) is larger than the extension angle of the first section (K1). A second curved portion (18) at which the extension angle changes is formed between the third section (K3) and the fourth section (K4), and the extension angle of the third section (K3) is larger than the extension angle of the fourth section (K4).

[0076] According to this structure, the second transition portion (16) is arranged at a position closer to the second axial side (L2) than the first transition portion (15) and overlapping with the first transition portion (15) when viewed in the axial direction, so that the first transition portion (15) and the second transition portion (16) are not arranged in the radial direction (R), which makes it easy to miniaturize the radial size of the winding end. In addition, according to this structure, by making the inclination angle of the second section (K2) greater than the inclination angle of the first section (K1), it is possible to avoid interference between the first section (K1) and the third phase winding transition section (30) arranged on the axial first side (L1) in the first section (K1), interference between the second section (K2) and the second phase winding transition section (20) arranged on the axial second side (L2) in the second section (K2), interference between the third section (K3) and the third phase winding transition section (30) arranged on the axial second side (L2) in the third section (K3), and interference between the fourth section (K4) and the second phase winding transition section (20) arranged on the axial first side (L1) in the fourth section (K4), and it is possible to arrange the first transition section (15) and the second transition section (16) in a limited circumferential (C) space. Furthermore, by reducing the inclination of the first section (K1) and the fourth section (K4), it is easy to shorten the axial length (L) of the first axial side (L1) toward the circumferential second side (C2) in the first section (K1), and it is easy to shorten the axial length (L) of the first axial side (L1) toward the circumferential first side (C1) in the fourth section (K4). That is, as a whole of the transition section (40), the length toward the axial first side (L1), that is, the height of the axial direction (L) of the winding (84) can be kept low. Therefore, it is easy to miniaturize the axial dimension of the winding end. In this way, according to this structure, a stator (8) can be realized that avoids interference between the segment conductors (4) and can miniaturize the winding end.

[0077] Here, preferably, the first interval (K1) is configured to be on the inner side (R1) of the radial direction (R) relative to the second phase winding transition portion (20), and overlaps with the second phase winding transition portion (20) when observed radially along the radial direction (R); the second interval (K2) is configured to be on the inner side (R1) of the radial direction (R) relative to the third phase winding transition portion (30), and overlaps with the third phase winding transition portion (30) when observed radially; the third interval (K3) is configured to be on the outer side (R2) of the radial direction (R) relative to the second phase winding transition portion (20), and overlaps with the second phase winding transition portion (20) when observed radially; and the fourth interval (K4) is configured to be on the outer side (R2) of the radial direction (R) relative to the third phase winding transition portion (30), and overlaps with the third phase winding transition portion (30) when observed radially.

[0078] According to this structure, the first transition part (15) and the second transition part (16) of the first phase winding (1), the second phase winding transition part (20), and the third phase winding transition part (30) can be appropriately arranged in a limited space, thereby easily achieving miniaturization of the first winding end (85) of the stator (8).

[0079] Here, preferably, the connection area (E3) is arranged as a whole along the circumferential direction (C), and the radial bend portion (19) is arranged at a position that does not overlap with both the second phase winding transition portion (20) and the third phase winding transition portion (30) when viewed in the radial direction.

[0080] According to this structure, it is easy to achieve miniaturization of the radial (R) dimension of the first winding end portion (85) compared to the case where the radial bend portion (19) is arranged to overlap with at least one of the second phase winding transition portion (20) and the third phase winding transition portion (30) when viewed in the radial direction. In addition, the radial bend portion (19) formed in the connection area (E3) is formed only by bending in the radial direction (R), and the segment conductor (4) is not bent in the axial direction (L). That is, the bend portion is formed in the connection area (E3) in a manner that does not combine the bending direction of the segment conductor (4) (in a manner that does not combine edge bending and plane bending), so the mechanical load on the insulating film applied to the surface of the segment conductor (4) is not easy to increase, and it is easy to ensure insulation.

[0081] In the stator (8), preferably, the conductor constituting the winding 84 is a covered conductor wire having a rectangular cross section and an insulating coating formed on the surface.

[0082] Compared with round wire, the flat wire can easily increase the space factor, and accordingly, the stator (8) can be easily miniaturized. In addition, by having an insulating coating, it is easy to ensure insulation and to wind the stator core (80) on the winding (84) with a high space factor. In addition, the flat wire can easily maintain the formed shape, so, for example, it is easy to form the first transition part (15) and the second transition part (16) of the first phase winding (1), the second phase winding transition part (20), and the third phase winding transition part (30) into a certain shape, and it is easy to arrange them in a limited space and appropriately configure them.

[0083] In the stator (8), preferably, the cross-section of the conductor in the first transition portion (15) and the second transition portion (16) is a rectangle in which the dimension (W1) in the axial direction (L) is greater than the dimension (W2) in the radial direction (R), and the first bent portion (17) and the second bent portion (18) are axial bent portions bent along the axial direction (L).

[0084] The first curved portion (17) and the second curved portion (18) are not curved in the radial direction (R), thereby preventing the winding end of the stator (8) from becoming larger in the radial direction (R). In addition, by making the first curved portion (17) and the second curved portion (18) curved in the axial direction (L), the axial length of the first transition portion (15) is shortened. Therefore, it is easy to achieve miniaturization of the winding end of the stator (8).

[0085] Description of Reference Numerals

[0086] 1: first phase winding, 2: second phase winding, 3: third phase winding, 8: stator, 11: first accommodating portion, 12: second accommodating portion, 13: third accommodating portion, 14: fourth accommodating portion, 15: first transition portion, 16: second transition portion, 17: first bending portion, 18: second bending portion, 19: radial bending portion, 20: second phase winding transition portion, 30: third phase winding transition portion, 40: transition portion, 49: bending portion, 80: stator core, 84: winding, C: circumferential direction, C1: first circumferential side, C2: second circumferential side, E1: first circumferential area, E2: second circumferential area, E3: connection area domain, K1: first section, K2: second section, K3: third section, K4: fourth section, L: axial, L1: first axial side, L2: second axial side, R: radial, R1: radial inner side (radial inner side), R2: radial outer side (radial outer side), S: groove, S1: first groove, S2: second groove, S3: third groove, S4: fourth groove, X: axis, θ1: first extension angle (extension angle of first section), θ2: second extension angle (extension angle of second section), θ3: third extension angle (extension angle of third section), θ4: fourth extension angle (extension angle of fourth section)

Claims

1. A stator, the stator being a stator for a rotating electrical machine, wherein: The invention comprises: a cylindrical stator core having a plurality of slots arranged in a circumferential direction; and a three-phase winding wound on the stator core for passing alternating currents of different phases; The phases of the alternating current are set to be the first phase, the second phase, and the third phase in the order of advancement of the phases, the winding through which the alternating current of the first phase flows is set to be the first phase winding, the winding through which the alternating current of the second phase flows is set to be the second phase winding, the winding through which the alternating current of the third phase flows is set to be the third phase winding, the direction along the axis of the stator core is set to be the axial direction, the direction orthogonal to the axis is set to be the radial direction, one side of the axial direction is set to be the first axial side, the other side of the axial direction is set to be the second axial side, one side of the circumferential direction is set to be the first circumferential side, and the other side of the circumferential direction is set to be the second circumferential side, The first phase winding comprises: a first accommodation portion accommodated in the first slot, namely, the first slot; a second accommodation portion accommodated in the second slot, the second slot being the slot adjacent to the first slot on the second side in the circumferential direction; a third accommodation portion accommodated in a third groove, the third groove being the groove disposed separately from the second groove on the second side in the circumferential direction with a plurality of the grooves interposed therebetween; a fourth accommodation portion, accommodated in a fourth groove, wherein the fourth groove is the groove adjacent to the third groove on the second side in the circumferential direction; a first transition portion, connecting the first accommodation portion and the fourth accommodation portion on a first axial side relative to the stator core; and a second transition portion connecting the second accommodation portion and the third accommodation portion at the first axial side relative to the stator core; The second transition portion is arranged to be located closer to the second side in the axial direction than the first transition portion and to overlap with the first transition portion when viewed in the axial direction in the axial direction. The portion of the second phase winding protruding toward the first axial side relative to the stator core is set as a second phase winding transition portion, and the portion of the third phase winding protruding toward the first axial side relative to the stator core is set as a third phase winding transition portion, The first transition portion comprises: a first circumferential region, which is a region on the first circumferential side; and a second circumferential region, which is a region located on the second circumferential side relative to the first circumferential region. A connecting region is a region connecting the first circumferential region and the second circumferential region and includes a radial bending portion formed along the radial bending; The first circumferential region has: a first section, which is on the second axial side relative to the third phase winding transition portion and overlaps with the third phase winding transition portion when viewed in the axial direction; and a second section, which is on the first axial side relative to the second phase winding transition portion and overlaps with the second phase winding transition portion when viewed in the axial direction; The second circumferential region comprises: a third section, which is on the first axial side relative to the third phase winding transition portion and overlaps with the third phase winding transition portion when viewed in the axial direction; and a fourth section, which is on the second axial side relative to the second phase winding transition portion and overlaps with the second phase winding transition portion when viewed in the axial direction; The first circumferential region is inclined as a whole toward the first axial side as it approaches the second circumferential side, and the second circumferential region is inclined as a whole toward the second axial side as it approaches the second circumferential side. The angle formed by the extension direction of the first transition portion relative to the circumferential direction is taken as the extension angle, A first curved portion where the extension angle changes is formed between the first section and the second section, and the extension angle of the second section is larger than the extension angle of the first section. A second curved portion at which the extension angle changes is formed between the third section and the fourth section, and the extension angle of the third section is larger than the extension angle of the fourth section.

2. The stator according to claim 1, wherein: The first section is arranged to be on the inner side of the second phase winding transition portion in the radial direction and overlaps with the second phase winding transition portion when viewed in the radial direction along the radial direction. The second section is arranged to be on the inner side of the third phase winding transition portion in the radial direction and overlaps with the third phase winding transition portion when viewed in the radial direction. The third section is arranged outside the second phase winding transition portion in the radial direction and overlaps with the second phase winding transition portion when viewed in the radial direction. The fourth section is arranged outside the third phase winding transition portion in the radial direction and overlaps with the third phase winding transition portion when viewed in the radial direction.

3. The stator according to claim 2, wherein: The connection area is arranged along the circumferential direction as a whole, The radially curved portion is arranged at a position that does not overlap with both the second-phase winding transition portion and the third-phase winding transition portion when viewed in the radial direction.

4. The stator according to any one of claims 1 to 3, wherein: The conductor constituting the winding is a covered conductor wire having a rectangular cross section and an insulating film formed on the surface.

5. The stator according to claim 4, wherein: The cross section of the conductor in the first transition portion and the second transition portion is a rectangle in which the axial dimension is larger than the radial dimension. The first curved portion and the second curved portion are axial curved portions curved along the axial direction.

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