Stator

Abstract

To achieve a stator in which specific segment conductors can be attached to a stator core so as not to interfere with segment conductors constituting main body portions of a coil when the segment conductors are assembled to the stator core.SOLUTION: A plurality of segment conductors 4 includes a plurality of general segment conductors 5 that is continuously joined to each other to form a plurality of coil main body portions 83, and specific segment conductors 6 that are joined to respective ends of the plurality of coil main body portions 83. At least some axially extending portions 64 of the plurality of specific segment conductors 6 do not overlap with transition portions 40 when viewed in an axial direction along an axial direction L, and are arranged so as to have portions sandwiched between radial directions R of the plurality of transition portions 40 arranged at different positions in the radial directions R.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a stator for a rotating electric machine that includes a cylindrical stator core having a plurality of slots arranged in a circumferential direction, and a coil wound around the stator core. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2018-11491 discloses a stator (13) including a coil (30) formed using a segment conductor (40) made of a rectangular wire with a rectangular cross section (reference symbols in parentheses in the background art are those of this document). The segment conductor (40) is formed in a generally U-shape and has two housing portions (straight portions (41)) that correspond to the sides of the U and are inserted from one axial side into groove-shaped slots (21) formed along the axial direction of the stator core (20) and housed therein, and a bridge portion (turn portion (42)) that corresponds to the bottom of the U and connects the two housing portions. The segment conductor (40) is arranged in the stator core (20) with the bridge portion protruding from one axial side of the stator core (20). Further, on the other axial side of the stator core 20, lead portions 32, 33, which correspond to the lateral ends of the U-shape and extend from the housing portion, protrude from the stator core 12. These lead portions 32, 33 are joined by welding or the like to the lead portions 32, 33 of other segment conductors 40, thereby forming a coil body of the coil (stator winding 20). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-11491 Summary of the Invention [Problem to be solved by the invention]

[0004] The coil includes not only general segment conductors that form the coil body, but also specific segment conductors, such as segment conductors that function as power lines connecting the coil body to a power source. The specific segment conductor has an accommodation portion that is accommodated in a slot of the stator core and an axially extending portion that extends in the axial direction relative to the stator core. When the segment conductors are accommodated from the radially outer side to the radially inner side of the stator core, the specific segment conductor is often positioned on the radially inner side. If the crossover portion of the radially innermost segment conductor among the segment conductors that form the coil body overlaps with the radially innermost portion of the slot in the axial direction, it becomes difficult to insert the specific segment conductor into the slot along the axial direction after the crossover portion is positioned in the radially innermost portion of the slot. On the other hand, attaching a segment conductor having a crossover portion to the stator core after inserting the specific segment conductor into the slot increases the difficulty of the assembly work, which may lead to reduced workability. It is also possible to combine a segment conductor having the transition portion with a specific segment conductor in advance and then insert both of them into the slot along the axial direction, but this also increases the difficulty of the assembly work and may lead to a decrease in workability. In other words, there is a risk that the specific segment conductor may not be easily accommodated in the slot due to interference with the transition portion.

[0005] In view of the above background, it is desirable to realize a stator that allows specific segment conductors to be attached to a stator core so that they do not interfere with the segment conductors that form the main body of the coil when the segment conductors are assembled to the stator core. [Means for solving the problem]

[0006] In view of the above, a stator for a rotating electric machine includes a cylindrical stator core having a plurality of slots arranged in a circumferential direction, and a coil wound around the stator core, wherein a direction along an axis of the stator core is defined as an axial direction, a direction perpendicular to the axis is defined as a radial direction, one side in the axial direction is defined as an axial first side, and the other side in the axial direction is defined as an axial second side, the coil is configured by joining a plurality of segment conductors, and a plurality of joints that join the plurality of segment conductors together are provided on the axial second side of the stator core, and the plurality of segment conductors include a plurality of general segment conductors that are joined together continuously to form a plurality of coil main body portions, and specific segment conductors that are joined to each end of the plurality of coil main body portions, and the general segment conductors are configured by joining a plurality of segment conductors together on the axial second side of the stator core. The segment conductor includes a first accommodating portion accommodated in a first slot, which is the first of the slots; a second accommodating portion accommodated in a second slot, which is the slot arranged circumferentially spaced apart from the first slot; and a bridge portion connecting the first accommodating portion and the second accommodating portion on the first axial side of the stator core. The specific segment conductor includes a specific accommodating portion accommodated in the slot and an axially extending portion extending along the axial direction on the first axial side of the stator core. The axially extending portions of at least some of the specific segment conductors do not overlap with the bridge portion when viewed in the axial direction along the axial direction, and are arranged so as to have portions that are sandwiched radially between multiple bridge portions arranged at different radial positions.

[0007] The multiple segment conductors are assembled to the stator core by inserting them into the slots of the stator core from the first axial side. According to this configuration, even when the multiple segment conductors are assembled in the slots starting from the outermost one in the radial direction, the specific segment conductors do not interfere with the assembly of the general segment conductors, making it easy to prevent the general segment conductors from interfering with the assembly of the specific segment conductors. In other words, this configuration makes it possible to realize a stator in which the specific segment conductors can be attached to the stator core so as not to interfere with the segment conductors that constitute the main body of the coil when the segment conductors are assembled to the stator core.

[0008] Further features and advantages of the stator of the rotating electrical machine will become apparent from the following description of exemplary, non-limiting embodiments thereof, which are given with reference to the drawings. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing the appearance of a stator; [Figure 2] Schematic circuit block diagram showing an example of electrical connections to a coil. [Figure 3] A diagram showing the basic structure of a segment conductor [Figure 4] Partial perspective view of the stator as seen from the radially inner side [Figure 5] 1 is a plan view of a stator as viewed from a first axial side; [Figure 6] Partial side view showing the appearance of the stator [Figure 7] Enlarged perspective view of the stator as seen from the inside in the radial direction [Figure 8] FIG. 10 is an enlarged perspective view of a stator of a comparative example, seen from the radially inner side. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a stator for a rotating electric machine will be described below with reference to the drawings. The perspective view of FIG. 1 shows a stator 8 in which a coil 84 (stator coil) is wound around a stator core 80. In the following description, the terms "axial direction L," "radial direction R," and "circumferential direction C" are defined with reference to the axis X of the stator core 80 around which the coil 84 is wound. As shown in FIG. 1, one side in the axial direction L is referred to as an axial first side L1, and the other side in the axial direction L (opposite the axial first side L1) is referred to as an axial second side L2. One side in the circumferential direction C is referred to as a circumferential first side C1, and the other side in the circumferential direction C (opposite the circumferential first side C1) is referred to as a circumferential second side C2. In the following description, the directions of the coil 84 and the segment conductors 4 forming the coil 84 refer to the directions when the coil 84 is wound around the stator core 80.

[0011] As shown in FIG. 2, an inverter INV is provided as an AC power source that supplies AC power to the rotating electric machine (stator 8). The inverter INV is connected between a DC power source 91 and the coil 84, and converts power between DC power and multi-phase (here, three-phase) AC power. The inverter INV is configured with a plurality of switching elements. The rotating electric machine can function as both an electric motor and a generator. When functioning as a generator, the generated AC power is converted by the inverter INV into DC power and supplied to the DC power source 91. The DC power source 91 is configured, for example, by a secondary battery (battery) such as a nickel-metal hydride battery or a lithium-ion battery, or an electric double-layer capacitor. When the rotating electric machine is used as a driving power source for a vehicle, the DC power source 91 is a high-voltage, large-capacity power source, and the rated power supply voltage is, for example, 200 to 400 V. A DC link capacitor 92 (smoothing capacitor) that smoothes the voltage on the DC side of the inverter INV (DC link voltage) is provided on the DC side of the inverter INV. The DC link capacitor 92 stabilizes the DC voltage (DC link voltage) that fluctuates in accordance with fluctuations in the power consumption of the rotating electrical machine.

[0012] 2, in this embodiment, the coil 84 is a Y-connection type in which each of the three phases (U-phase, V-phase, and W-phase) is connected at a neutral point. As will be described in detail later, the coils of the three phases (here, the first-phase coil 1, the second-phase coil 2, and the third-phase coil 3) are electrically connected to one another by a neutral point bus bar 88. Furthermore, each of the coils of the three phases is electrically connected to the three-phase AC outputs of the inverter INV by a power line bus bar 87. Note that the first-phase coil 1 may be any of the U-phase, V-phase, and W-phase, and similarly, the second-phase coil 2 and the third-phase coil 3 correspond to any of the U-phase, V-phase, and W-phase depending on the first-phase coil 1.

[0013] As shown in FIG. 1 , the coil 84 is wound around a stator core 80 in which a plurality of slots S extending in an axial direction L and a plurality of teeth T are formed in a circumferential direction C. The stator core 80 includes 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 toward a radially inner side R1 (the side where a rotor (not shown) is disposed in this embodiment). A groove-shaped slot S having a bottom on a radially outer side R2 is formed between two adjacent teeth T in the circumferential direction C. In this embodiment, the slot S is a semi-open slot, and an opening of the slot S on the radially inner side R1 is formed to have a smaller width in the circumferential direction C than a region of the slot S where the coil 84 is disposed. Here, the width of the opening of the slot S in the circumferential direction C is formed to be smaller than a long side length W1, which will be 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 mainly from a compacted powder material obtained by compressing and molding powder of a magnetic material.

[0014] The coil 84 has a plurality of accommodating sections (a first end-side accommodating section 41, a second end-side accommodating section 42, and a specific accommodating section 63, which will be described later) that are respectively arranged in the slot S. In the present embodiment, the accommodating sections are arranged in the slot S so as to extend parallel to the axial direction L. As shown in FIGS. 1 and 5, the coil 84 has a plurality of accommodating sections arranged in layers within one slot S, with the arrangement area of ​​one accommodating section in the radial direction R being one layer. In the present embodiment, the coil 84 has a six-layer winding structure, and within one slot S, the plurality of accommodating sections are divided into six layers and arranged in a row along the radial direction R. Therefore, in the present embodiment, a maximum of six accommodating sections are arranged lined up in the radial direction R within one slot S.

[0015] The coil 84 is formed by joining a plurality of segment conductors 4 as shown in Fig. 3. Each of the segment conductors 4 has lead portions (a first lead portion 43 and a second lead portion 44) at both ends in the extension direction of the segment conductor 4. The coil 84 is formed by sequentially joining the lead portions of the plurality of segment conductors 4 together.

[0016] Each of the segment conductors 4 is formed using a single continuous linear conductor. Here, "continuous" means that it is formed seamlessly and integrally in the extending direction. The linear conductor is made of a conductive material such as copper or 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 polyamideimide, etc.) except for the electrical connection points between different components.

[0017] As shown in Fig. 3, in this embodiment, the linear conductors constituting the segment conductors 4 are linear conductors (rectangular wires) having a rectangular cross section (rectangular in this embodiment) perpendicular to the extending direction. In this embodiment, the cross section of the segment conductor 4 is a rectangle with a long side length W1 and a short side length W2. Note that the cross section may be a square, and may also be a rectangle with arc-chamfered (R-chamfered) or linearly chamfered (C-chamfered) corners, or a rectangle where the absolute value of the difference between the size of the interior angle and 90 degrees is less than a predetermined angle (for example, 5 degrees or 10 degrees).

[0018] The segment conductors 4 include general segment conductors 5 that are continuously joined together to form the multiple coil body portions 83 that form the core of the coil 84, as described above, and specific segment conductors 6 that are joined to each end of the coil body portions. In this embodiment, the specific segment conductors 6 are segment conductors 4 that connect the power line bus bars 87 that supply AC power from the inverter INV to the coil body portions 83, and that connect the neutral point bus bar 88 that forms the neutral point of the coil 84 to the neutral points of the multiple coil body portions 83.

[0019] FIG. 3 schematically shows a general segment conductor 5 as a representative of the segment conductors 4. The general segment conductor 5 has an approximately U-shape. As shown in FIG. 3, the long-side side of a rectangular wire with a rectangular cross section corresponds to the front side of the approximately U-shape, and the short-side side of the rectangular wire corresponds to the side. The general segment conductor 5 is formed into a U-shape by edgewise bending the short sides, except for a bent portion in the radial direction R (radial bent portion 49), which will be described later.

[0020] Each of the segment conductors 4 has a first lead portion 43 and a second lead portion 44 at both ends in the extending direction of the segment conductor 4. In the linearly extending portion of the approximately U-shape on the first lead portion 43 side, the first lead portion 43 and the first end-side accommodating portion 41 (first accommodating portion) are formed continuously and linearly, and in the linearly extending portion on the second lead portion 44 side, the second lead portion 44 and the second end-side accommodating portion 42 (second accommodating portion) are formed continuously and linearly. A transition portion 40 is formed at the bottom of the approximately U-shape so as to connect the first end-side accommodating portion 41 and the second end-side accommodating portion 42. The above-mentioned radially bent portion 49 is formed in the center of the transition portion 40. This radially bent portion 49 is formed by flatwise bending the long side.

[0021] The first end-side accommodating portion 41 and the second end-side accommodating portion 42 are portions accommodated in slots S of the stator core 80. The distance in the circumferential direction C between the first end-side accommodating portion 41 and the second end-side accommodating portion 42 is N times (N is a natural number) the distance between adjacent slots S in the circumferential direction C. As described above, the segment conductor 4 is arranged in six layers within one slot S, with the arrangement area of ​​one accommodating portion (such as the first end-side accommodating portion 41 or the second end-side accommodating portion 42) in the radial direction R being one layer. In other words, within one slot S, the multiple accommodating portions are arranged in a row along the radial direction R. Therefore, the distance in the circumferential direction C differs between the radially inner side R1 and the radially outer side R2. Therefore, the distance in the circumferential direction C between the first end side accommodating portion 41 and the second end side accommodating portion 42 of the segment conductor 4 arranged on the radial outer side R2 is wider than the distance in the circumferential direction C between the first end side accommodating portion 41 and the second end side accommodating portion 42 of the segment conductor 4 arranged on the radial inner side R1.

[0022] The segment conductor 4 is inserted into the slots S along the axial direction L from the first axial side L1 toward the second axial side L2 of the stator core 80, from the side of the first lead portion 43 and the second lead portion 44. The crossover portion 40 is a portion that protrudes toward the first axial side L1 of the stator core 80 when the first-end-side accommodating portion 41 and the second-end-side accommodating portion 42 of the segment conductor 4 are accommodated in the slots S. 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 accommodating portion 41 and the second-end-side accommodating portion 42 of the segment conductor 4 are accommodated in the slots S. The protruding first lead portion 43 and the second lead portion 44 are bent in the circumferential direction C as indicated by the two-dot chain line in FIG. 3 and joined to the lead portions of other segment conductors 4 by welding or the like. The first lead portion 43 and the second lead portion 44 correspond to a joint portion 45 relative to the transition portion 40 .

[0023] Thus, protruding portions of the coils 84, known as coil end portions, are formed on the first axial side L1 and the second axial side L2 of the stator core 80. When distinguishing between the two, the coil end portion formed by the transition portion 40 on the first axial side L1 is referred to as the first coil end portion 85, and the coil end portion formed by the joint portion 45 on the second axial side L2 is referred to as the second coil end portion 86. The length from the first axial side end face 81 of the stator core 80 to the portion where the transition portion 40 projects most toward the first axial side L1 corresponds to the length in the axial direction L of the first coil end portion 85. Furthermore, the length from the second axial side end face 82 of the stator core 80 to the portion where the joint portion 45 projects most toward the second axial side L2 corresponds to the length in the axial direction L of the second coil end portion 86.

[0024] The coil 84 includes not only general segment conductors 5 that form the coil body 83, but also specific segment conductors 6 that are electrically connected to a power line bus bar 87 that connects the coil body 83 to a power source (in this case, an inverter INV that supplies AC power) and a neutral bus bar 88 that connects different phases in the coil body 83. As shown in Figs. 1 and 4 to 7, etc., the specific segment conductor 6 has a specific accommodation portion 63 that is accommodated in a slot S of the stator core 80, and an axial extension portion 64 that extends in the axial direction L on a first axial side L1 with respect to the stator core 80.

[0025] In the present embodiment, the specific segment conductor 6 includes a radially extending portion 65 that extends in the radial direction R on the first axial side L1 of the jumper portion 40 (general segment jumper portion 55) of the general segment conductor 5 and on the radially outer side R2 of the axially extending portion 64. The radially extending portion 65 makes it easy to join the power line bus bar 87 or the neutral point bus bar 88 to the specific segment conductor 6 by welding or the like. Naturally, as long as the power line bus bar 87 or the neutral point bus bar 88 can be appropriately joined to the specific segment conductor 6, the specific segment conductor 6 may be formed without including the radially extending portion 65.

[0026] As will be described later, the axially extending portions 64 are arranged in the stator core 80 so as not to overlap with the crossover portions 40 (general segment crossover portions 55) of the general segment conductors 5 in the axial direction. In contrast, the radially extending portions 65, when arranged in the stator core 80, overlap with the general segment crossover portions 55 in the axial direction.

[0027] The specific segment conductors 6 also include a plurality of power line conductors 61 connected to an AC power supply (here, an inverter INV) and a plurality of neutral point conductors 62 for connecting neutral points of the coil main bodies 83. As shown in Figs. 1 and 6, the radially extending portions 65 of the power line conductors 61 are disposed closer to the first axial side L1 than the radially extending portions 65 of the neutral point conductors 62.

[0028] The power line conductors 61 and the neutral point conductors 62 are electrically connected to different objects. Furthermore, when the radially extending portions 65 are provided, the radially extending portions 65 are connected to an AC power supply (inverter INV) or a component connecting the neutral point. Since the radially extending portions 65 of the power line conductors 61 and the neutral point conductors 62 are arranged at different positions in the axial direction L, the power line conductors 61 and the neutral point conductors 62 can be appropriately connected to their connection objects. The neutral point is realized by connecting the coil main bodies 83 together, and the AC power supply is arranged separately from the coil main bodies 83. Therefore, since the radially extending portions 65 of the multiple power line conductors 61 are arranged closer to the first axial side L1 than the radially extending portions 65 of the multiple neutral point conductors 62, it is easy to arrange conductors connecting the multiple neutral point conductors 62 together in the circumferential direction C and to connect each of the multiple power line conductors 61 to an AC power supply.

[0029] According to the above configuration, for example, the coils 84 of each phase can be joined to the neutral point bus bar 88 on the second axial side L2 of the power line bus bar 87. Because the inverter INV is disposed at a location separate from the stator 8, the bus bars can also be efficiently arranged by positioning the joint between the neutral point bus bar 88 and the coils 84 closer to the stator 8 than the joint between the power line bus bar 87 and the coils 84. However, for example, the inverter INV may be arranged so that its position in the axial direction L overlaps that of the stator core 80. In this case, it may be preferable to arrange the radially extending portion 65 of the power line conductor 61 at a position closer to the first axial side end face 81 of the stator core 80. Therefore, the present invention is not limited to a configuration in which the radially extending portions 65 of the plurality of power line conductors 61 are disposed closer to the first axial side L1 than the radially extending portions 65 of the plurality of neutral point conductors 62, but may be a configuration in which the radially extending portions 65 of the plurality of power line conductors 61 are disposed closer to the second axial side L2 than the radially extending portions 65 of the plurality of neutral point conductors 62. Also, the radially extending portions 65 of the plurality of power line conductors 61 and the radially extending portions 65 of the plurality of neutral point conductors 62 may be disposed at the same position in the axial direction L.

[0030] 1 , in this embodiment, the neutral point conductor 62 is arranged in the middle of the power line conductors 61 arranged along the circumferential direction C. That is, the embodiment illustrates a configuration in which the neutral point conductor 62, the neutral point conductor 62, the power line conductor 61, the neutral point conductor 62, the power line conductor 61, and the power line conductor 61 are arranged in this order from the first circumferential side C1 to the second circumferential side C2. However, the neutral point conductor 62 and the power line conductor 61 may be arranged consecutively in the circumferential direction C.

[0031] Incidentally, when the segment conductors 4 are accommodated in the stator core 80 from the radially outer side R2 toward the radially inner side R1, the specific segment conductor 6 is often arranged on the radially inner side R1. For example, as in the stator 8B of the comparative example shown in Fig. 8 , if the crossover portion 40 of the segment conductor 4 arranged on the radially innermost side R1 among the segment conductors 4 (general segment conductors 5) constituting the coil body 83 overlaps with the region in the radial direction R of the slot S in which the specific accommodation portion 63 of the specific segment conductor 6 is arranged, it is difficult to insert the specific segment conductor 6 into the slot S along the axial direction L after the crossover portion 40 is arranged in that portion of the slot S.

[0032] For example, if the general segment conductors 5 having the transition portions 40 are attached to the stator core 80 after the specific segment conductors 6 are inserted into the slots S, the assembly work becomes more difficult, which may lead to a decrease in workability. In particular, in the case where the radial extending portions 65 are formed from the end portions of the axially extending portions 64 on the first axial side L1 toward the radially outer side R2 as shown in FIG. 8, the work of attaching the general segment conductors 5 to the stator core 80 after the specific segment conductors 6 are inserted into the slots S becomes more difficult.

[0033] It is also possible to combine a general segment conductor 5 having the transition portion 40 with a specific segment conductor 6 in advance and then insert both segment conductors 4 into the slots S along the axial direction L. However, this would also increase the difficulty of the assembly work, which could lead to reduced workability. That is, as in the stator 8B of the comparative example shown in FIG. 8 , if the transition portion 40 of the segment conductor 4 that is located on the innermost radial side R1 among the segment conductors 4 (general segment conductors 5) that make up the coil body 83 overlaps, as viewed in the axial direction, with the region in the radial direction R of the slot S where the specific accommodating portion 63 of the specific segment conductor 6 is located, the segment conductor 4 cannot be easily accommodated in the slot S due to interference between the transition portion 40 and the specific segment conductor 6.

[0034] In contrast, the stator 8 of this embodiment is configured so that the specific segment conductors 6 can be attached to the stator core 80 so as not to interfere with the segment conductors 4 (general segment conductors 5) that constitute the coil main body 83 when the segment conductors 4 are assembled to the stator core 80.

[0035] As described above, the stator 8 of this embodiment includes a cylindrical stator core 80 having a plurality of slots S arranged in the circumferential direction C, and a coil 84 wound around the stator core 80. The coil 84 is configured by joining a plurality of segment conductors 4 together, and a plurality of joint portions 45 (first lead portions 43 and second lead portions 44) that join the plurality of segment conductors 4 together are provided on the second axial side L2 with respect to the stator core 80. The plurality of segment conductors 4 include a plurality of general segment conductors 5 that are joined together in series to form a plurality of coil body portions 83 (the coil body portion 83 of the first phase coil 1, the coil body portion 83 of the second phase coil 2, and the coil body portion 83 of the third phase coil 3, respectively), and specific segment conductors 6 that are joined to the respective ends of the plurality of coil body portions 83.

[0036] As shown in Figures 1, 4, 7, etc., the general segment conductor 5 includes a first accommodating portion 51 accommodated in the first slot S1, a second accommodating portion 52 accommodated in the second slot S2, which is a slot S arranged spaced apart from the first slot S1 in the circumferential direction C, and a general segment crossover portion 55 (crossover portion 40) connecting the first accommodating portion 51 and the second accommodating portion 52 to the stator core 80 on the first axial side L1.

[0037] The specific segment conductor 6 includes a specific accommodating portion 63 accommodated in the slot S, and an axially extending portion 64 extending along the axial direction L on the first axial side L1 with respect to the stator core 80. Although not shown, a lead portion is formed from the specific accommodating portion 63 in the same manner as the general segment conductor 5, so as to be continuous with the specific accommodating portion 63 and protrude from the second axial side end face 82 of the stator core 80 toward the second axial side L2. At this lead portion, an end (joint portion 45) of any one of the first phase coil 1, the second phase coil 2, and the third phase coil 3 is joined to the specific segment conductor 6.

[0038] As shown in Figures 1, 4, 5, 7, etc., the axial extending portions 64 of at least some of the multiple specific segment conductors 6 are arranged so that they do not overlap with the general segment jumper portions 55 when viewed axially along the axial direction L, and have portions that are sandwiched between the radial direction R of multiple general segment jumper portions 55 arranged at different positions in the radial direction R.

[0039] As described above, the multiple segment conductors 4 are assembled to the stator core 80 by being inserted into the slots S of the stator core 80 from the first axial side L1. As shown in FIG. 7 , the axially extending portion 64 of the specific segment conductor 6 is formed linearly without bending in the radial direction R. That is, the specific accommodating portion 63 and the axially extending portion 64 are formed continuously and linearly. Therefore, the crossover portion 40 of the general segment conductor 5 is not disposed at a position overlapping with the specific accommodating portion 63 in the axial view. Therefore, the specific segment conductor 6 and the general segment conductor 5 can be appropriately inserted into the slots S from the first axial side L1, respectively, without the specific accommodating portion 63 and the crossover portion 40 interfering with each other.

[0040] On the other hand, in the specific segment conductor 6B (comparative neutral point conductor 62B) of the comparative example shown in FIG. 8 , a specific bent portion 69 is formed between the specific accommodating portion 63 and the axially extending portion 64, where the specific segment conductor 6 is bent in the radial direction R (here, the specific segment conductor 6 is bent from the end of the axially extending portion 64 on the second axial side L2 toward the radially outer side R2). Therefore, when viewed in the axial direction, the position in the radial direction R of the slot S with which the specific accommodating portion 63 overlaps is different from the position in the radial direction R of the slot S with which the axially extending portion 64 overlaps. Therefore, when viewed in the axial direction, the crossover portion 40 of the general segment conductor 5 can be positioned at the position in the radial direction R of the slot S with which the specific accommodating portion 63 overlaps. However, if the crossover portion 40 of the general segment conductor 5 is positioned at this position, the specific accommodating portion 63 cannot be inserted straight into the slot S from the first axial side L1, which significantly reduces the ease of assembly, as described above.

[0041] However, even in this embodiment, it is not precluded that a specific bent portion 69 is formed between the specific accommodating portion 63 and the axially extending portion 64, where the specific segment conductor 6 is bent in the radial direction R. For example, if the specific bent portion 69 is formed so as to bend in the opposite direction of the radial direction R (in this case, from the end of the axially extending portion 64 on the second axial side L2 to the radially inward direction R1) compared to the specific segment conductor 6B of the comparative example, there is no effect on the assembly of the segment conductor 4.

[0042] In this embodiment, even when the multiple segment conductors 4 are assembled in the slot S in order from the one located on the radially outer side R2, the specific segment conductors 6 do not interfere with the assembly of the general segment conductors 5, and it is easy to prevent the general segment conductors 5 from interfering with the assembly of the specific segment conductors 6.

[0043] As described above, in this embodiment, the specific segment conductor 6 has the radially extending portion 65 that extends in the radial direction R on the first axial side L1 of the jumper portion 40 (general segment jumper portion 55) of the general segment conductor 5 and on the radially outer side R2 of the axially extending portion 64. The radially extending portion 65 makes it easy to join the power line bus bar 87 or the neutral point bus bar 88 to the specific segment conductor 6 by welding or the like. However, when such a radially extending portion 65 is present, the radially extending portion 65 is likely to interfere when assembling the general segment conductor 5 to the stator core 80. However, as described above, such interference can be avoided by assembling the specific segment conductor 6 after the general segment conductor 5 that is located radially outer R2.

[0044] In this embodiment, the radial extending portion 65 is formed by bending from the axial extending portion 64 radially outward R2, but the axial extending portion 64 and the radial extending portion 65 may be connected via another bending portion (for example, a bending portion in the circumferential direction C) or the like.

[0045] As shown in FIG. 5, in this embodiment, there is only one transition portion 40 (general segment transition portion 55) disposed radially inward R1 from the axially extending portion 64 when viewed in the axial direction.

[0046] The general segment conductors 5 are arranged over multiple turns in the radial direction R. However, if the jumper portion 40 (general segment jumper portion 55) of the general segment conductor 5 is arranged on the radially inner side R1 for only one turn as in this embodiment, when the specific segment conductor 6 is arranged on the radially innermost side R1 in the slot S, the axially extending portion 64 can be formed linearly, which facilitates assembly of the specific segment conductor 6 to the stator core 80. Furthermore, the shape of the specific segment conductor 6 can be easily simplified. For example, as in the specific segment conductor 6B of the comparative example illustrated in FIG. 8 , it is not necessary to form a bent portion (specific bent portion 69) in the radial direction R.

[0047] Of the multiple crossover portions 40 (general segment crossover portions 55) arranged at the innermost positions in the radial direction R, one crossover portion 40 (first general segment crossover portion 53 in FIG. 7 and other figures) that has a portion overlapping with a specific segment conductor 6 when viewed in the radial direction is formed so that there are no portions that bend in the radial direction R throughout the entire portion that extends in the circumferential direction C. In addition, another crossover portion 40 (second general segment crossover portion 54 in FIG. 7 and other figures) has a bent portion (radial bent portion 49) that bends in the radial direction R in the portion that extends in the circumferential direction C.

[0048] According to this configuration, it is easy to sequentially assemble the general segment conductors 5 having the crossover portion 40 (general segment crossover portion 55) arranged at the innermost position in the radial direction R in the circumferential direction C. Therefore, it is easy to configure the stator 8 in which the segment conductors 4 can be easily assembled to the stator core 80.

[0049] In the stator 8B of the comparative example illustrated in FIG. 8 , a crossover portion 40 having a portion overlapping with a specific segment conductor 6 in a radial view has a radially bent portion 49 bent in the radial direction R in a portion extending in the circumferential direction C. More specifically, among the multiple crossover portions 40 (general segment crossover portions 55) having a portion located at the innermost side in the radial direction R, the crossover portion 40 that transitions (changes lanes) from the innermost side in the radial direction R through the radially bent portion 49 to the radially outer side R2 overlaps with the specific segment conductor 6 in a region where it transitions to the radially outer side R2 in a radial view. In this case, the crossover portion 40 bent to the radially outer side R2 by the radially bent portion 49 overlaps with the region in the radial direction R of the slot S into which the specific segment conductor 6 is inserted in an axial view. Therefore, compared to the present embodiment, the ease of assembling the segment conductors 4 to the stator core 80 is deteriorated.

[0050] Furthermore, even if the crossover portion 40 (general segment crossover portion 55) having a portion overlapping with the specific segment conductor 6 in the radial direction R among the multiple crossover portions 40 arranged at the innermost side in the radial direction R has a bent portion (radial bent portion 49) that bends in the radial direction R in the portion extending in the circumferential direction C, the ease of assembly may not be reduced. That is, as in the neutral point conductor 62 shown in FIG. 5 , when the portion of the crossover portion 40 that passes through the innermost side in the radial direction R overlaps with the specific segment conductor 6 (axially extending portion 64) in the radial direction, the crossover portion 40 does not overlap with the region in the radial direction R of the slot S into which the specific segment conductor 6 is inserted in the axial direction. Therefore, the segment conductor 4 can be appropriately assembled to the stator core 80. [Explanation of symbols]

[0051] 4: segment conductor, 5: general segment conductor, 6: specific segment conductor, 8: stator, 40: jumper portion, 45: joint portion, 51: first accommodating portion, 52: second accommodating portion, 61: power line conductor, 62: neutral point conductor, 62B: neutral point conductor, 63: specific accommodating portion, 64: axial extension portion, 65: radial extension portion, 80: stator core, 83: coil main body portion, 84: coil, C: circumferential direction, INV: inverter (AC power supply), L: axial direction, L1: first axial side, L2: second axial side, R: radial direction, R1: radially inner side (radially inner side), R2: radially outer side (radially outer side), S: slot, S1: first slot, S2: second slot, X: axial center

Claims

1. A stator for a rotating electric machine, comprising: a cylindrical stator core having a plurality of slots arranged in a circumferential direction; and a coil wound around the stator core, A direction along the axis of the stator core is defined as an axial direction, a direction perpendicular to the axis is defined as a radial direction, one side in the axial direction is defined as an axial first side, and the other side in the axial direction is defined as an axial second side, The coil is configured by joining a plurality of segment conductors, a plurality of joints that join the plurality of segment conductors together are provided on the second axial side of the stator core; the plurality of segment conductors include a plurality of general segment conductors that are continuously joined to each other to form a plurality of coil body portions, and specific segment conductors that are joined to respective ends of the plurality of coil body portions, The general segment conductor includes a first accommodating portion accommodated in a first slot, which is a first of the slots; a second accommodating portion accommodated in a second slot, which is a slot arranged spaced apart from the first slot in the circumferential direction; and a bridge portion connecting the first accommodating portion and the second accommodating portion on the first axial side of the stator core, the specific segment conductor includes a specific housing portion that is housed in the slot, and an axially extending portion that extends along the axial direction on the first axial side with respect to the stator core, The first accommodating portion, the second accommodating portion, and the specific accommodating portion are accommodating portions for the segment conductor, A plurality of the accommodating portions are arranged in a row along the radial direction inside one of the slots, the specific accommodating portion is disposed at the innermost position in the radial direction of the slot, a stator in which the axially extending portions of at least some of the specific segment conductors are arranged so as not to overlap with the jumper portions when viewed in the axial direction along the axial direction, and have portions that are sandwiched in the radial direction between multiple jumper portions that are arranged at different positions in the radial direction.

2. 2. The stator according to claim 1, wherein the specific segment conductors each include a radially extending portion that is located on the first axial side of the jumper portion of the general segment conductor and radially outer than the axially extending portion.

3. the plurality of specific segment conductors include a plurality of power line conductors connected to an AC power supply and a plurality of neutral point conductors for connecting neutral points of the plurality of coil body portions, The stator according to claim 2 , wherein the radially extending portions of the plurality of power line conductors are arranged on the first axial side of the radially extending portions of the plurality of neutral point conductors.

4. The stator according to claim 1 , wherein there is only one of the bridge portions disposed radially inward of the axially extending portion when viewed in the axial direction.

5. 5. The stator according to claim 4, wherein, of the plurality of crossover portions arranged at the innermost positions in the radial direction, one crossover portion having a portion overlapping with the specific segment conductor as viewed along the radial direction is formed so that there is no portion bending in the radial direction throughout the entire portion extending in the circumferential direction, and the other crossover portions have bending portions bending in the radial direction in the portion extending in the circumferential direction.

6. A stator for a rotating electric machine, comprising: a cylindrical stator core having a plurality of slots arranged in a circumferential direction; and a coil wound around the stator core, A direction along the axis of the stator core is defined as an axial direction, a direction perpendicular to the axis is defined as a radial direction, one side in the axial direction is defined as an axial first side, and the other side in the axial direction is defined as an axial second side, The coil is configured by joining a plurality of segment conductors, a plurality of joints that join the plurality of segment conductors together are provided on the second axial side of the stator core; the plurality of segment conductors include a plurality of general segment conductors that are continuously joined to each other to form a plurality of coil body portions, and specific segment conductors that are joined to respective ends of the plurality of coil body portions, The general segment conductor includes a first accommodating portion accommodated in a first slot, which is a first of the slots; a second accommodating portion accommodated in a second slot, which is a slot arranged spaced apart from the first slot in the circumferential direction; and a bridge portion connecting the first accommodating portion and the second accommodating portion on the first axial side of the stator core, the specific segment conductor includes a specific housing portion that is housed in the slot, and an axially extending portion that extends along the axial direction on the first axial side with respect to the stator core, the axially extending portions of at least some of the specific segment conductors are arranged so as not to overlap with the jumper portions when viewed in the axial direction along the axial direction, and have portions that are sandwiched in the radial direction between the jumper portions that are arranged at different positions in the radial direction, the number of the bridge portions arranged radially inward of the axially extending portions is only one as viewed in the axial direction, a stator in which, among the plurality of crossover sections arranged at the innermost radial position, one crossover section having a portion overlapping with the specific segment conductor when viewed along the radial direction is formed so that there are no radially bent portions throughout the circumferentially extending portion, and the other crossover sections have bent portions that bend in the radial direction in the circumferentially extending portion.

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