Rotating electric machine

Abstract

In the present invention, slots are provided with number 1 to n conductor wires, where n is an even number of four or more, disposed so as to be radially aligned in a plurality of layers. In each phase of a rotating electric machine (1000), a conductor wire structure is configured by connecting a plurality of conductor wires in series or in parallel. A stator (100) has a plurality of groups, which are groups of multiple conductor wires having the same phase housed in adjacent slots, and, where q is the number of slots per pole per phase, the plurality of groups having the same phase is arranged so as to be uniformly separated from each other in the circumferential direction at a slot pitch of q × number of phases of the rotating electric machine (1000). Different groups having the same phase are connected using a plurality of cross wires that connect any one group of number 1 wires with any other group of number n wires, and there are a plurality of types of cross wires for different slot pitches.

Description

Rotating electric machines

[0001] The present disclosure relates to a rotating electric machine.

[0002] In the windings of rotating electrical machines, in order to achieve various target performances within a limited range, parameters such as the number of slots per pole per phase, series or parallel winding (number of parallel windings), full-pitch or short-pitch winding, etc. are appropriately designed to achieve the targets.

[0003] For example, a rotating electric machine has been disclosed in which the coils of each phase are connected by joining the ends of the outermost or innermost segment conductors of the crossover wires of each phase in a fractional pitch winding (see, for example, Patent Document 1).Also disclosed is a rotating electric machine that uses a connection plate that connects the segment conductors and has power supply terminals and extends over more than half the circumference of the coil end (see, for example, Patent Document 2).

[0004] Japanese Patent No. 5541585 Japanese Patent Application Laid-Open No. 2021-52510

[0005] However, in the rotating electric machine of Patent Document 1, when the outermost peripheral ends are connected together, the size of the coil end increases in the radial or axial direction. When the innermost peripheral ends are connected together, consideration must be given to preventing interference between the rotor and the crossover wires during rotor assembly and operation. Furthermore, both methods increase the number of components and welding points, resulting in increased costs due to increased man-hours. Furthermore, in the rotating electric machine of Patent Document 2, while power can be supplied to each segment conductor by using a connection plate, the coil end increases in the radial or axial direction, and the use of a connection plate increases costs.

[0006] The present disclosure discloses a technology for solving the above-mentioned problems, and provides a rotating electric machine that reduces the number of welding points on crossover wires, can connect a single phase without using a connection plate, and enables the stator to be made smaller and at a lower cost.

[0007] A rotating electric machine according to the present disclosure has a stator configured by mounting a stator winding on a stator core, the stator core having a plurality of slots arranged in the circumferential direction, n being an even number of 4 or greater, and the slots being equipped with conductor wires numbered 1 to n arranged in multiple layers in the radial direction, and in each phase of the rotating electric machine, a conductor wire structure is formed by connecting the plurality of conductor wires in series or in parallel, q being a natural number of 2 or greater, the stator having q number of slots per pole per phase, and a plurality of groups which are collections of a plurality of the conductor wires of the same phase housed in adjacent slots, the plurality of groups of the same phase being arranged equally spaced apart from each other in the circumferential direction at a slot pitch of the number of phases of the rotating electric machine × q, and different groups of the same phase are connected to each other using a plurality of crossover wires connecting any one of the number 1 wires of one group to any one of the number n wires of the other group, and there are a plurality of types of crossover wires with different slot pitches.

[0008] According to the rotating electric machine of the present disclosure, the number of welding points of crossover wires can be reduced, a single phase can be connected without using a connection plate, and a rotating electric machine can be obtained that achieves a smaller and less costly stator.

[0009] FIG. 1 is an overall configuration diagram of a stator in a rotating electric machine according to embodiment 1. FIG. 2 is an explanatory diagram of the arrangement of stator windings in a rotating electric machine according to embodiment 1. FIG. 3 is a front view of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 4A is a development view of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 4B is a top view of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 4C is a bottom view of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 5A is a development view of a crossover wire of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 5B is a top view of a crossover wire of a rectangular segment conductor in a rotating electric machine according to embodiment 1. FIG. 9A is a connection diagram for one phase of a stator winding (two parallel, full-pitch winding) in a rotating electric machine according to embodiment 1. FIG. 9A is a connection diagram for one phase of a stator winding (two parallel, short-pitch winding) in a rotating electric machine according to embodiment 1. FIG. 9A is a perspective view of a stator winding for one phase in a rotating electric machine according to embodiment 1. FIG. 9A is a top cross-sectional view of a crossover wire of a rectangular segment conductor in a rotating electric machine according to embodiment 2. FIG. 9B is a top cross-sectional view of a connecting wire of a rectangular conductor segment in a rotating electric machine according to embodiment 2. FIG. 10A is a view before processing of a rectangular conductor segment in a rotating electric machine according to embodiment 3. FIG. 10B is a development view of a rectangular conductor segment in a rotating electric machine according to embodiment 3. FIG. 10C is a top view of a rectangular conductor segment in a rotating electric machine according to embodiment 3. FIG. 11A is a development view of a connecting wire of a rectangular conductor segment in a rotating electric machine according to embodiment 3. FIG. 11B is a top view of a connecting wire of a rectangular conductor segment in a rotating electric machine according to embodiment 3. FIG. 12A is a top view of a stator in a rotating electric machine according to embodiment 4. FIG. 12B is a radially outer view of a stator in a rotating electric machine according to embodiment 4. FIG. 12C is a radially inner view of a stator in a rotating electric machine according to embodiment 3. A connection diagram for one phase of a stator winding (series, full-pitch winding) in a rotating electric machine according to embodiment 5. A perspective view of one phase of a stator winding (series, full-pitch winding) in a rotating electric machine according to embodiment 5. 10 is a connection diagram of one phase of a stator winding (series, full-pitch winding) in a rotary electric machine according to embodiment 5. FIG. 11 is a perspective view of one phase of a stator winding (series, full-pitch winding) in a rotary electric machine according to embodiment 5.FIG. 21A is a connection diagram for one phase of a stator winding (2 parallel, full-pitch winding) in a rotating electric machine according to embodiment 5. FIG. 21B is a connection diagram for one phase of a stator winding (4 parallel, full-pitch winding) in a rotating electric machine according to embodiment 5. FIG. 21C is a connection diagram for one phase of a stator winding (8 parallel, full-pitch winding) in a rotating electric machine according to embodiment 6. FIG. 21A is a development view of a rectangular segment conductor to which a winding start conductor is connected in a rotating electric machine according to embodiment 6. FIG. 21B is a circumferential view of a rectangular segment conductor to which a winding start conductor is connected in a rotating electric machine according to embodiment 6. FIG. 21C is a top view of a rectangular segment conductor to which a winding start conductor is connected in a rotating electric machine according to embodiment 6. FIG. 22A is a development view of a rectangular segment conductor to which a winding end conductor is connected in a rotating electric machine according to embodiment 6. FIG. 22B is a top view of a crossover wire of a rectangular segment conductor to which a winding end conductor is connected in a rotating electric machine according to embodiment 6. FIG. 10 is a perspective view of one phase of the stator winding in the rotary electric machine according to embodiment 6. FIG. 11 is an enlarged view of one phase of the stator winding in the rotary electric machine according to embodiment 6. FIG. 12 is an attachment diagram of wiring members to the stator winding in the rotary electric machine according to embodiment 6. FIG. 13 is an attachment diagram of wiring members to the stator winding in the rotary electric machine according to embodiment 6. FIG. 14 is an arrangement diagram of temperature measuring elements relative to the stator winding in the rotary electric machine according to embodiment 7. FIG. 15 is an arrangement diagram of temperature measuring elements relative to the stator winding in the rotary electric machine according to embodiment 7. FIG. 16 is an arrangement diagram of temperature measuring elements relative to the stator winding in the rotary electric machine according to embodiment 7.

[0010] Embodiment 1. Embodiment 1 relates to a rotating electric machine having a stator configured by mounting a stator winding on a stator core, the stator core having a plurality of slots arranged in the circumferential direction, n being an even number equal to or greater than 4, the slots being equipped with conductor wires numbered 1 to n arranged in multiple layers in the radial direction, the conductor wire structure being formed by connecting the plurality of conductor wires in series or parallel in each phase of the rotating electric machine, the stator having q slots per pole per phase (q is a natural number equal to or greater than 2), and having a plurality of groups which are collections of a plurality of conductor wires of the same phase housed in adjacent slots, the plurality of same-phase groups being arranged equally spaced apart from each other in the circumferential direction at a slot pitch of the number of phases of the rotating electric machine × q, and different groups of the same phase being connected using a plurality of crossover wires connecting any one of the number 1 wires of one group to any one of the number n wires of the other group, and having a plurality of types of crossover wires with different slot pitches.

[0011] The rotating electric machine according to the first embodiment will be described below with reference to Fig. 1, which shows the overall configuration of the stator; Fig. 2, which illustrates the layout of the stator winding; Fig. 3, which shows a front view of a rectangular segment conductor; Fig. 4A, which shows an expanded view of the rectangular segment conductor; Fig. 4B, which shows a top view of the rectangular segment conductor; Fig. 4C, which shows a bottom view of the rectangular segment conductor; Fig. 5A, which shows an expanded view of the crossover wires of the rectangular segment conductor; Fig. 5B, which shows a top view of the crossover wires of the rectangular segment conductor; Fig. 6, which shows a connection diagram for one phase of a stator winding (two parallel, full-pitch winding); Fig. 7, which shows a connection diagram for one phase of a stator winding (two parallel, short-pitch winding); and Fig. 8, which is a perspective view of one phase of the stator winding. Note that identical or corresponding parts in each figure are designated by the same reference numerals. Furthermore, the size and scale of corresponding components are independent of each other in the illustrations.

[0012] First, the structure of a rotating electric machine 1000 according to the first embodiment will be described with reference to FIG. 1 , which is an overall diagram of the stator 100. The rotating electric machine 1000 is composed of a stator 100 and a rotor (not shown) rotatably mounted inside the stator 100. The stator 100 includes a stator core 101 and a stator winding 102. In the figure, the side where the top 21 of the rectangular conductor segment 20 in FIG. 4A (described later) is installed, i.e., the side where the winding start conductor (WSC) and winding end conductor (WEC) are installed, is designated the wiring side (WDS). The opposite side of the wiring side (WDS), i.e., the side where the joint 25 of the rectangular conductor segment 20 in FIG. 4A is installed, is designated the anti-wiring side (AWS).

[0013] In the following description, the rotation axis of the rotor is the central axis of the stator 100, and unless otherwise specified, the terms axial (direction), radial (direction), and circumferential (direction) refer to the central axis (direction), radial (direction), and circumferential (direction) of the central axis in a cylindrical coordinate system centered on the central axis of the stator 100. Specifically, the central axis direction of the stator 100 is referred to as the axial (XD) direction, and the wire connection side (WDS) is the positive direction. Furthermore, a view of the stator 100 viewed from the wire connection side (WDS) in the axial (RD) direction is referred to as a top view, a view of the stator 100 viewed from the outer diameter side of the stator 100 in the radial direction (RD) is referred to as an inner diameter view, a view of the stator 100 viewed from the outer diameter side of the central axis in the radial direction (RD) is referred to as an outer diameter view, and a view of the stator 100 viewed in the circumferential direction around the central axis is referred to as a circumferential view.

[0014] Next, the arrangement of the stator winding 102 of the stator 100 will be described with reference to FIG. 2 . FIG. 2 illustrates the arrangement of conductor wires for one phase in a three-phase rotating electric machine with q slots per pole per phase (where q is a natural number equal to or greater than 2), in which multiple conductor wires No. 1 to No. n (where n is a natural number equal to or greater than 2) are housed in a radial row within one circumferentially arranged slot. The circumferential distance between adjacent slots is defined as a unit slot pitch, and k slot pitches are defined as k times the unit slot pitch (where k is a natural number equal to or greater than 1). A group of conductor wires No. 1 to No. n in q adjacent slots (U1 to Uq) of the same phase (a group of q × n conductor wires) is referred to as a group (GR). In the case of parallel connection, the number of parallel winding start conductors and winding end conductors of the conductor wires is represented as 2N (where N is a natural number). In FIG. 2 , the radial direction is designated as RD, the circumferential direction as PD, the inner diameter side as IS, and the outer diameter side as OS. Also, the slot number is written as SN, line 1 as 1L, line 2 as 2L, line 3 as 3L, ..., line n as nL, and group as GR. Also, the unit slot pitch is written as USP, and the k slot pitch is written as kSP.

[0015] Next, the rectangular segment conductor used in the stator winding 102 of the stator 100 will be described with reference to FIGS. 3, 4A, 4B, 4C, 5A, and 5B.

[0016] 3 is a front view of the rectangular conductor segment 10 housed at the winding start and end of the No. 1 and No. n wires. The rectangular conductor segment 10 includes a top portion 11, a hypotenuse portion 12, a straight portion 13, a twisted portion 14, and a joint portion 15. The top portion 11 and the hypotenuse portion 12 are located on the wire connection side (WDS) of the stator 100, the straight portion 13 is located in a slot of the stator core 101, and the twisted portion 14 and the joint portion 15 are located on the anti-wire connection side (ADS) of the stator 100. The hypotenuse portion 12 is formed in a process prior to insertion into the stator core 101. The twisted portion 14 may be formed in a process prior to insertion into the slot of the stator core 101, or it may be bent after insertion.

[0017] Figures 4A, 4B, and 4C are development, top, and bottom views of U-shaped rectangular conductor segments 20 housed in wires 2 to n-1 of different groups. Figure 4B corresponds to view A in Figure 4A, and Figure 4C corresponds to view B in Figure 4A. The rectangular conductor segments 20 include a top portion 21, a hypotenuse portion 22, a straight portion 23, a twisted portion 24, and a joint portion 25. The top portion 21 and the hypotenuse portion 22 are located on the wire-connection side (WDS) of the stator 100, the straight portion 23 is located in a slot in the stator core 101, and the twisted portion 24 and the joint portion 25 are located on the anti-wire-connection side (ADS) of the stator 100. The hypotenuse portion 22 is formed in a process prior to insertion into the stator core 101. The twisted portions 24 may be formed in a process prior to insertion into the slots of the stator core 101, or may be bent after being accommodated.

[0018] 5A and 5B are development and top views of a crossover wire of a U-shaped rectangular conductor segment 30 housed in wires No. 1 and No. n of different groups (GR). FIG. 5B corresponds to the view of arrow C in FIG. 5A . The rectangular conductor segment 30 includes a top portion 31, a hypotenuse portion 32, a straight portion 33, a twisted portion 34, and a joint portion 35. The top portion 31 and the hypotenuse portion 32 are located on the wire connection side (WDS) of the stator 100, the straight portion 33 is located in a slot of the stator core 101, and the twisted portion 34 and the joint portion 35 are located on the anti-wire connection side (ADS) of the stator 100. The hypotenuse portion 32 is formed in a process prior to insertion into the stator core 101. The twisted portion 34 may be formed in a process prior to insertion into the slot of the stator core 101, or it may be bent after insertion.

[0019] Next, a specific example of the winding arrangement of the stator 100 of the rotating electric machine 1000 of the first embodiment will be described with reference to Figures 6, 7, and 8. Figure 6 is a wiring diagram for a three-phase rotating electric machine using rectangular segment conductors, with the number of slots per pole per phase q = 2, the number of conductors in the slot n = 4, the number of parallel windings = 2, and full-pitch winding. The rectangular segment conductor 10 shown in Figure 3 is used for the winding start conductors (WSC) and winding end conductors (WEC) of wires 1 and 4. The U-shaped rectangular segment conductors 20 and 30 shown in Figures 4A and 5A are used for the winding start conductors (WSC) and winding end conductors (WEC) of wires 1 and 4, respectively.

[0020] In Figure 6, solid lines indicate the segment conductors on the non-connection side (AWS), dashed lines indicate the rectangular segment conductors on the connection side (WDS), and dots indicate the joint points (JP) on the non-connection side (AWS). In Figure 6, the radial direction is indicated as RD, the circumferential direction as PD, positive circumferential direction as P, negative circumferential direction as N, the inner diameter side as IS, and the outer diameter side as OS. The slot number is also indicated as SN, wire number 1 as 1L, wire number 2 as 2L, wire number 3 as 3L, and wire number 4 as 4L, the joint point as JP, and the group as GR. The crossover wire is also indicated as CL, the start conductor as WSC, the end conductor as WEC, the lap winding portion as OWP, the 6-slot pitch as 6SP, and the 7-slot pitch as 7SP.

[0021] Here, we will explain how to arrange the rectangular segment conductors 10, 20, and 30 in the slots of the stator 100. In the full-pitch winding shown in Figure 6, the number of parallel windings is two, and the winding start conductor (WSC) is the connection side (WDS) of wire No. 1 in slot No. 20 and wire No. 1 in slot No. 14. Wire No. 1 in slot No. 20 is connected to wire No. 2 in slot No. 14 at joints 15 and 25 on one side of the rectangular segment conductor on the opposite connection side (AWS) of the group (GR) adjacent in the negative circumferential (N) direction of the group (GR) in which the winding start conductor (WSC) is located. The flat rectangular segment conductor accommodated in wire 2 of slot number 14 has its other end accommodated in wire 3 of slot number 20, and is connected at joint 25 to one joint 25 of a crossover wire (CL) with a 6-slot pitch accommodated in wire 4 of slot number 14, and the other joint 25 of the crossover wire (CL) with a 6-slot pitch is accommodated in wire 1 of slot number 8 of the adjacent group (GR).

[0022] When the portion where adjacent groups (GR) are alternately connected, such as the first wire of slot number 14 to the fourth wire of slot number 8, is defined as a lap winding portion (OWP), the crossover wires (CL) are arranged so that they overlap when the lap winding portion (OWP) is viewed in the axial direction (XD) from the wire connection side (WDS) of the stator 100, and the lap winding portion (OWP) and the crossover wires (CL) with a 6-slot pitch are alternately arranged and connected in the negative (N) direction of the circumferential direction (PD). When the lap winding portion (OWP) is connected up to the group (GR) adjacent in the positive (P) direction of the circumferential direction (PD) of the group (GR) of slots that accommodates the winding start conductor (WSC), the crossover wires (CL) with a 7-slot pitch are accommodated in the group (GR) where the final slot of the lap winding portion (OWP) is located and in the adjacent slot of the same group (GR) as the slot that accommodates the winding start conductor (WSC). Again, by alternately arranging the lap winding portion (OWP) and the crossover wires (CL) at a pitch of six slots, the winding end conductor (WEC) is arranged on the connection side (WDS) of wire number 4 in slot number 25 of the adjacent group (GR) in the positive (P) circumferential direction (PD). By similarly arranging wire number 1 in slot number 14 of the other of the winding start conductors (WSC), the winding end conductor (WEC) is arranged on wire number 4 in slot number 19 of the adjacent group (GR) in the positive (P) circumferential direction (PD).

[0023] Figure 7 is a wiring diagram showing the change from full-pitch winding to fractional-pitch winding compared to Figure 6. The symbols and other designations are the same as those in Figure 6, and therefore will not be described further. In the case of fractional-pitch winding shown in Figure 7, lap windings (OWP) and crossover wires (CL) with a 7-lot pitch are alternately arranged for wire No. 1 in winding start slot number 14. When the lap windings (OWP) are connected to the group (GR) adjacent in the positive (P) circumferential direction (PD) of the group (GR) in which the winding start conductor (WSC) is located, crossover wires (CL) with an 8-slot pitch are accommodated in the group (GR) in which the final slot of the lap windings (OWP) is located and in adjacent slots in the same group (GR) as the winding start slot. By alternately arranging the lap windings (OWP) and crossover wires (CL) again, the winding end conductor (WEC) is located on the connection side (WDS) of wire No. 4 in slot number 20 of the group (GR) adjacent in the positive (P) circumferential direction (PD). The winding end conductor (WEC) corresponds to wire 4 in slot number 26, while wire 1 in slot number 20 is the winding start slot.

[0024] Figure 8 is a perspective view of the stator winding 102 modeled on Figure 7, in which the crossover wire (CL), winding start conductor (WSC), and winding end conductor (WEC) on the wire connection side (WDS) are arranged to axially cover the lap winding part (OWP). In Figure 8, CL1 is a crossover wire with a k slot pitch, and CL2 is a crossover wire with a k+1 slot pitch.

[0025] By adopting the configuration of the stator 100 of the rotating electric machine 1000 of the first embodiment, variations in full-pitch winding and fractional-pitch winding are possible. By consolidating group changes using crossover wires with different pitches and using U-shaped crossover wires as segment conductors, the use of connection plates and irregular welding when changing groups is unnecessary. The coil ends are made smaller, resulting in lighter weight, lower cost, and higher performance. Furthermore, since the end-of-winding conductors are housed in groups adjacent to the group housing the start-of-winding conductors, the start-of-winding conductors and the end-of-winding conductors are arranged circumferentially side by side. As a result, the conductors used for power supply and the conductors used as neutral points are located close to each other, simplifying wiring, improving workability, and enabling miniaturization and cost reduction. Furthermore, the use of rectangular segment conductors improves the space factor within the slots, allowing for efficient transfer of heat from the segment conductors to the core and providing high heat dissipation. Furthermore, full-pitch winding and fractional-pitch winding can be formed using the same method. In the case of full-pitch winding, torque density can be maximized, and in the case of short-pitch winding, harmonic components can be suppressed, and noise and vibration can also be suppressed.

[0026] As described above, according to the rotating electric machine of the first embodiment, it is possible to reduce the number of welding points of the crossover wires, to connect a single phase without using a connection plate, and to obtain a rotating electric machine that realizes a smaller and less costly stator.

[0027] Second Embodiment The second embodiment relates to an appropriate selection of the cross-sectional shape of the top of the rectangular segment conductor of the crossover wire.

[0028] 9A and 9B are cross-sectional views of the top of connecting wires of rectangular conductor segments in a rotating electric machine according to embodiment 2. In the drawings of embodiment 2, parts that are the same as or equivalent to those in embodiment 1 are given the same reference numerals.

[0029] 9A and 9B are cross-sectional views of the top 31 of the rectangular conductor segment 30 of the crossover wire (CL). Note that FIGS. 9A and 9B correspond to the arrow D in FIG. 5B of the first embodiment. In FIGS. 9A and 9B, the longitudinal direction is designated as LD, the transverse direction as SD, and the insulating coating as IL. FIG. 9A shows a configuration in which the longitudinal direction (LD) of the rectangular conductor segment 30 of the crossover wire (CL) is perpendicular to the axial direction (XD). FIG. 9B shows a configuration in which the transverse direction (SD) of the rectangular conductor segment 30 of the crossover wire (CL) is perpendicular to the axial direction (XD).

[0030] In the configuration of embodiment 2, when the longitudinal direction (LD) is arranged perpendicular to the axial direction (XD), the tops 31 of the crossover wires (CL) are located at the axial ends of the stator winding 102, so the axial dimension of the coil end can be reduced by the difference between the long side and the short side, thereby minimizing it. Furthermore, when the short side direction (SD) is arranged perpendicular to the axial direction (XD), the distance between the tops 31 of the crossover wires (CL) lined up in the circumferential direction (PD) is maximized, so the insulation clearance can be set large.

[0031] As described above, the rotating electric machine of embodiment 2 can reduce the number of welds on the crossover wires, connect a single phase without using a connection plate, and achieve a rotating electric machine that achieves a smaller stator and lower costs. Furthermore, by appropriately selecting the cross-sectional shape of the top of the rectangular segment conductor of the crossover wire, it is possible to minimize the axial dimension of the coil end or increase the insulation distance at the top of the crossover wire.

[0032] Third Embodiment A rotating electric machine according to a third embodiment uses a U-shaped segment conductor formed from two straight conductors.

[0033] The rotating electric machine of the third embodiment will be described, focusing on the differences from the first embodiment, based on Fig. 10A , which shows a diagram of a rectangular conductor segment before processing, Fig. 10B , which shows an expanded view of the rectangular conductor segment, Fig. 10C , which shows a top view of the rectangular conductor segment, Fig. 11A , which shows an expanded view of the crossover wire of the rectangular conductor segment, and Fig. 11B , which shows a top view of the crossover wire of the rectangular conductor segment. In the drawings of the third embodiment, parts that are the same as or equivalent to those of the first embodiment are designated by the same reference numerals. Note that Fig. 10C corresponds to the arrow E in Fig. 10B . Fig. 11B corresponds to the arrow F in Fig. 11A . Note that, to distinguish from the first embodiment, the U-shaped conductor segments housed in tracks 2 to n-1 are designated 40, and the U-shaped conductor segments of the crossover wires are designated 50.

[0034] The conductor segments housed in tracks 2 to n-1 shown in Figures 10A to 10C are formed from two rectangular conductor segments, with a joint 46 added to the top 41 of the wiring side (WDS). Figures 11A and 11B show crossover wires formed from two rectangular conductor segments, with a joint 56 added to the top 51 of the wiring side (WDS).

[0035] Figure 10A shows a straight rectangular conductor segment 40a before processing. In Figures 10B and 10C, the rectangular conductor segment 40 includes a top portion 41, a hypotenuse portion 42, a straight portion 43, a twisted portion 44, a joint portion 45, and an additional joint portion 46. The top portion 41, the hypotenuse portion 42, and the joint portion 46 are located on the wire connection side (WDS) of the stator 100, the straight portion 43 is located in a slot in the stator core 101, and the twisted portion 44 and the joint portion 45 are located on the anti-wire connection side (ADS) of the stator 100. The additional joint portion 46 is joined by welding or the like. In Figure 10A, Ta indicates the starting point of the twist on the wire connection side (WDS). Tb indicates the starting point of the twist on the anti-wire connection side (ADS).

[0036] 11A and 11B, rectangular conductor segment 50 includes apex 51, oblique side 52, straight portion 53, twisted portion 54, joint 55, and additional joint 56. Apex 51, oblique side 52, and joint 56 are located on the wire connection side (WDS) of stator 100, straight portion 53 is located in a slot of stator core 101, and twisted portion 54 and joint 55 are located on the anti-wire connection side (ADS) of stator 100. The additional joint 56 is joined by welding or the like.

[0037] In the third embodiment, two straight rectangular conductor segments 40a can be used to form the connection side as well as the non-connection side by a single twist. Therefore, if the number of conductors in the slots of the rotating electric machine 1000, the slot pitch, or the axial length of the stator core needs to be changed, the molding dies for the top and oblique sides required for the U-shaped conductor segments of the first embodiment are no longer necessary, and this can be accommodated by simply changing the length of the straight conductor segments. As a result, it is easier to consider molding conditions when developing new models due to specification changes, and jigs and molds are no longer necessary, allowing for significant cost reductions.

[0038] As described above, the rotating electric machine of the third embodiment can reduce the number of welds for crossover wires, can connect a single phase without using a connection plate, and can achieve a rotating electric machine that achieves a smaller stator and lower costs. Furthermore, it does not require a molding die, making it easy to respond to changes in specifications.

[0039] Fourth Embodiment A rotating electric machine according to a fourth embodiment relates to a design method for avoiding interference between crossover wires and end-of-winding conductors.

[0040] The rotating electric machine of embodiment 4 will be described with reference to Fig. 12A, which is a top view of the stator, Fig. 12B, which is a view of the stator in the outer radial direction, and Fig. 12C, which is a view of the stator in the inner radial direction, focusing on the differences from embodiment 1. In the drawings of embodiment 4, parts that are the same as or equivalent to those of embodiment 1 are given the same reference numerals.

[0041] In Fig. 12A, the peak-to-peak pitch is indicated as TP, CL1 is a crossover wire with a k slot pitch, and CL2 is a crossover wire with a k+1 slot pitch. The winding start conductor (WSC) in Fig. 12A may also be the winding end conductor (WEC). In Fig. 12B, the peak height is indicated as TH, and the 1st wire hypotenuse angle is indicated as 1LOSA. In Fig. 12C, the nth wire hypotenuse angle is indicated as nLOSA.

[0042] In order to arrange crossover wires (CL) and end-of-winding conductors (WEC) with different slot pitches, it is necessary to minimize the number of segment conductor types and arrange the conductors so that they do not interfere with each other. Figures 12A, 12B, and 12C show the parameters designed to avoid interference between crossover wires (CL) and end-of-winding conductors (WEC), namely, the top-to-bottom pitch (TP), the first wire hypotenuse angle (1LOSA), the nth wire hypotenuse angle (nLOSA), and the top height (TH).

[0043] For example, consider the case where the k slot pitch crossover wire (CL1), the k+1 slot pitch crossover wire (CL2), and the end-of-winding conductor (WEC) have the same top-to-top pitch (TP), the same wire 1 hypotenuse angle (1LOSA), and the same top height (TH), but the nth wire hypotenuse angle (nLOSA) is changed for each conductor. In this case, because the top-to-top pitch (TP) is the same, it is possible to ensure equal insulation distances between the tops. Because the wire 1 hypotenuse angle (1LOSA) is the same, there is no need to consider avoiding interference between the wires 1 and with the rotor, reducing labor costs. Because the top height (TH) is the same, it is possible to reduce the coil end height.

[0044] For example, consider the case where the wire 1 hypotenuse angle (1LOSA) and wire 2 hypotenuse angle (nLOSA) of the k-th slot pitch crossover wire (CL), the k+1-th slot pitch crossover wire (CL2), and the winding end conductor (WEC) are the same, and the top height (TH) is the same, but the top-to-top pitch (TP) is changed for each conductor. In this case, because the wire 1 hypotenuse angle (1LOSA) is the same, there is no need to consider interference prevention between the wires 1 and with the rotor, reducing labor hours. Because the wire 1 hypotenuse angle (1LOSA) and wire 2 hypotenuse angle (nLOSA) are the same, a common die can be used for the bending process, eliminating the need for die consideration. Setup changes for each segment conductor are also eliminated. Because the top height (TH) is the same, the coil end height can be reduced.

[0045] For example, consider the case where the wire 1 hypotenuse angle (1LOSA) and wire 2 hypotenuse angle (nLOSA) of the k-th slot pitch crossover wire (CL1), the k+1-th slot pitch crossover wire (CL2), and the end-of-winding conductor (WEC) are the same, and the top-to-bottom pitch (TP) is the same, but the top height (TH) is changed for each conductor. In this case, because the wire 1 hypotenuse angle (1LOSA) is the same, there is no need to consider interference prevention between wires 1 and with the rotor, reducing labor costs. Because the wire 1 hypotenuse angle (1LOSA) and wire 2 hypotenuse angle (nLOSA) are the same, the same die can be used for the bending process, eliminating die consideration and the need for setup changes for each segment conductor. Because the top-to-bottom pitch (TP) is the same, the insulation distance between the tops can be maintained at equal intervals.

[0046] By adopting the design method of the fourth embodiment, it is possible to flexibly design according to the purpose to avoid interference between the crossover wire and the end-of-winding conductor, and therefore it is possible to appropriately respond to a wide range of requirements.

[0047] As described above, according to the rotating electric machine of the fourth embodiment, the number of welding points of the crossover wires can be reduced, a single phase can be connected without using a connection plate, and a rotating electric machine that realizes a smaller stator and lower costs can be obtained. Furthermore, in order to avoid interference between the crossover wires and the end-of-winding conductors, an appropriate method can be selected according to the purpose.

[0048] Fifth Embodiment A rotating electric machine according to a fifth embodiment is configured so that connecting conductors are used for the stator windings.

[0049] The rotating electric machine of Embodiment 5 will be described, focusing on the differences from Embodiment 1, with reference to Fig. 13, which is a connection diagram of one phase of the stator winding (series, full-pitch winding), Fig. 14, a perspective view of one phase of the stator winding (series, full-pitch winding), Fig. 15, which is a connection diagram of one phase of the stator winding (series, full-pitch winding), Fig. 16, a perspective view of one phase of the stator winding (series, full-pitch winding), Fig. 17, which is a connection diagram of one phase of the stator winding (two parallel, full-pitch winding), and Fig. 18, which is a connection diagram of one phase of the stator winding (four parallel, full-pitch winding). In the drawings of Embodiment 5, parts that are the same as or equivalent to those of Embodiment 1 are given the same reference numerals.

[0050] Figure 13 is a wiring diagram for a three-phase rotating electric machine with two slots per pole per phase (q), four conductors in each slot, one phase of full-pitch winding connected in series, and the winding start conductor located on wire 1. In Figure 13, solid lines indicate the segment conductors on the anti-connection side (AWS), dashed lines indicate the segment conductors on the connection side (WDS), and dots indicate the junction points (JP) on the anti-connection side (AWS). Also in Figure 13, the radial direction is indicated as RD, the circumferential direction as PD, the positive circumferential direction as P, the negative circumferential direction as N, the inner diameter side as IS, and the outer diameter side as OS. The slot number is indicated as SN, wire 1 as 1L, wire 2 as 2L, wire 3 as 3L, and wire 4 as 4L, the junction point as JP, and the group as GR. In addition, the connecting conductor is described as CC, the winding start conductor as WSC, the winding end conductor as WEC, the lap winding portion as OWP, the 6-slot pitch as 6SP, and the 7-slot pitch as 7SP.

[0051] In the wiring diagram in Figure 13, wire No. 4 in slot 19 is connected to wire No. 4 in slot 25 of the adjacent group (GR) by a connecting conductor (CC). Note that wire No. 1 in slot 13 is the winding start conductor (WSC), and wire No. 1 in slot 20 is the winding end conductor (WEC).

[0052] Figure 14 is a stator winding diagram for one phase of the stator winding 102 in series connection when the winding start conductor (WSC) is arranged on wire No. 1, as opposed to Figure 13. In Figure 14, the connecting conductor is designated CC, the winding start conductor is designated WSC, and the winding end conductor is designated WEC. When the winding start conductor (WSC) is arranged on wire No. 1, the winding end conductor (WEC) is also arranged on wire No. 1, and the connecting conductor (CC) is arranged on the outer diameter side (OS). This prevents the conductor from being arranged on the inner diameter side (IS) of the stator core, eliminating interference with the rotor during assembly and improving assembly efficiency.

[0053] Figure 15 shows a wiring diagram for a three-phase rotating electric machine with q = 2 slots per pole per phase, 4 conductors in the slots, one phase of full-pitch winding connected in series, and the winding start conductor (WSC) located on wire 4. The notation of symbols and the like is the same as in Figure 13, so explanations will be omitted.

[0054] In the wiring diagram in Figure 15, wire 1 in slot 14 is connected to wire 1 in slot 20 of the adjacent group (GR) by a connecting conductor (CC). Note that wire 4 in slot 19 is the winding start conductor (WSC), and wire 4 in slot 25 is the winding end conductor (WEC).

[0055] Figure 16 is a stator winding diagram for one phase of the stator winding 102 in series connection when the winding start conductor (WSC) is placed on wire No. 4. In Figure 16, the connecting conductor is designated CC, the winding start conductor is designated WSC, and the winding end conductor is designated WEC. When the winding start conductor (WSC) is placed on wire No. 4, the winding end conductor (WEC) is also placed on wire No. 4, the connecting conductor (CC) is placed on the inner diameter side (IS), and the winding start conductor (WSC) and winding end conductor (WEC) are placed on the outer diameter side (OS), which simplifies the connection process for each phase and improves workability.

[0056] Figure 17 shows a wiring diagram for a three-phase rotating electric machine with the number of slots per pole per phase q = 4, the number of conductors in the slots 4, 2 parallel windings, and full-pitch winding (number of slots per pole per phase q ≥ number of parallel windings 2N). The symbols and other notations are the same as those in Figure 13, and their explanation will be omitted. When a winding start conductor (WSC) is set on wire number 1 of any group (GR), by installing a connecting conductor (CC) that connects the four wires of adjacent groups (GR), the winding end conductor (WEC) is placed on wire number 1 of the group (GR) adjacent to the winding start conductor (WSC).

[0057] In the wiring diagram of Figure 17, the fourth wire in the 26th slot is connected to the fourth wire in the 38th slot of the adjacent group (GR) by a connecting conductor (CC), and the fourth wire in the 28th slot is connected to the fourth wire in the 40th slot of the adjacent group (GR) by a connecting conductor (CC). Note that the winding start conductor (WSC) of the first wire in the 26th slot is the winding end conductor (WEC) of the first wire in the 14th slot. Also, the winding start conductor (WSC) of the first wire in the 28th slot is the winding end conductor (WEC) of the first wire in the 16th slot.

[0058] Figure 18 shows a wiring diagram for a three-phase rotating electric machine with the number of slots per pole per phase q = 4, the number of conductors in the slots 4, 4 parallel windings, and full-pitch winding (number of slots per pole per phase q ≥ number of parallel windings 2N). The symbols and other notations are the same as those in Figure 13, and their explanation will be omitted. When a winding start conductor (WSC) is set on wire number 1 of any group (GR), by installing a connecting conductor (CC) that connects the four wires of adjacent groups (GR), the winding end conductor (WEC) is placed on wire number 1 of the group (GR) adjacent to the winding start conductor (WSC).

[0059] In the wiring diagram of Figure 18, the fourth wire in lot 25 is connected to the fourth wire in slot 37 of the adjacent group (GR), the fourth wire in lot 26 to the fourth wire in slot 38, the fourth wire in lot 27 to the fourth wire in slot 39, and the fourth wire in lot 28 to the fourth wire in slot 40 with connecting conductors (CC). Note that, for example, the winding start conductor (WSC) of wire 1 in slot 25 is the winding end conductor (WEC) of wire 1 in slot 13. Also, the winding start conductor (WSC) of wire 1 in slot 28 is the winding end conductor (WEC) of wire 1 in slot 16.

[0060] As can be seen from Figures 17 and 18, when the number of slots per pole per phase q is greater than or equal to the number of parallel windings 2N, the connecting conductor (CC) is placed on the wire opposite to the wire on which the winding start conductor (WSC) and winding end conductor (WEC) are placed, just as in the case of a series connection.

[0061] The configuration of embodiment 5, i.e., the use of connecting conductors in the stator windings of a rotating machine, enables series-parallel connection of the stator windings, enabling wiring according to the purpose. In addition, since the winding start conductors and winding end conductors are arranged in adjacent groups, workability during wiring is improved. Furthermore, a connecting plate that extends around the entire periphery of the coil end is no longer necessary, allowing for miniaturization and cost reduction.

[0062] As described above, the rotating electric machine of the fifth embodiment can reduce the number of welds on the crossover wires, can connect a single phase without using a connection plate, and can achieve a rotating electric machine that achieves a smaller stator and lower costs. Furthermore, by using connecting conductors, it is possible to connect the stator windings in series and parallel, making it possible to achieve wiring that suits the purpose. In addition, the winding start and end and the connecting conductor can be set at any position on the inner and outer diameters, allowing for a layout that suits the purpose.

[0063] Sixth Embodiment The rotating electric machine of the sixth embodiment is capable of dealing with a winding configuration in which the number of slots per pole per phase q is less than the number of parallel windings 2N by devising an arrangement of crossover wires of the stator.

[0064] The rotating electric machine of Embodiment 6 will be described, focusing on the differences from Embodiment 1, with reference to Figures 19 and 20, which are connection diagrams for one phase of the stator winding (8 parallel, full-pitch winding), Figure 21A, which is a development diagram of the rectangular segment conductor to which the winding start conductor is connected, Figure 21B, which is a circumferential view of the rectangular segment conductor, Figure 21C, which is a top view of the rectangular segment conductor, Figure 22A, which is a development diagram of the rectangular segment conductor to which the winding end conductor is connected, Figure 22B, which is a top view of the rectangular segment conductor, Figure 23, which is a perspective view of one phase of the stator winding, Figure 24, which is an enlarged view of one phase of the stator winding, and Figures 25 and 26, which are views of attaching wiring members to the stator winding. In the drawings of Embodiment 6, parts that are the same as or equivalent to those of Embodiment 1 are given the same reference numerals.

[0065] Figure 19 is a connection diagram for a three-phase rotating electric machine with a per-pole per-phase slot count of q = 4, 4 conductors in each slot, 8 parallel windings, and full-pitch winding (per-pole per-phase slot count q < 2N parallel windings). In Figure 19, solid lines indicate the segment conductors on the anti-connection side (AWS), dashed lines indicate the segment conductors on the connection side (WDS), and dots indicate the junction points (JP) on the anti-connection side (AWS). Also, in Figure 19, the radial direction is indicated as RD, the circumferential direction as PD, the positive circumferential direction as P, the negative circumferential direction as N, the inner diameter side as IS, and the outer diameter side as OS. The slot number is indicated as SN, the first wire as 1L, the second wire as 2L, the third wire as 3L, and the fourth wire as 4L, the junction point as JP, and the group as GR. The crossover wire is indicated as CL, the start conductor as WSC, the end conductor as WEC, and the lap winding portion as OWP.

[0066] First, we will generalize the characteristics of the crossover wires in embodiment 6. If the smallest slot number in a group (GR) is U1 and the largest slot number is Uq, and m is a natural number, the winding start conductor (WSC) is arranged on wires 1 and n of the same group (GR), and the crossover wire (CL3) connects U1 of wire 1 of any group (GR) to Uq of wire n of the adjacent group (GR), and the crossover wire (CL4) connects Um+1 (where m is a natural number) of wire 1 of any group (GR) to Um of the adjacent group (GR).

[0067] Next, the arrangement of crossover wires (CL) will be specifically described with reference to the wiring diagram in Figure 19. In Figure 19, crossover wire (CL3) connects wire #1 in slot 1 corresponding to wire #1 U1 of any group to wire #4 in slot 16 corresponding to wire #n Uq of the adjacent group. Also, crossover wire (CL4) connects wire #1 in slot 2 corresponding to wire #1 Um+1 (when m = 1) of any group (GR) to wire #4 in slot 13 corresponding to Um (when m = 1) of the adjacent group (GR). Similarly, wire (CL4) connects wire #1 in slot 3 to wire #4 in slot 14, and wire #1 in slot 4 to wire #4 in slot 15. Note that, for simplicity's sake, three crossover wires (e.g., wire #1 in slot 1 → wire #4 in slot 16) are designated as CL4.

[0068] Here, we will explain the correspondence between winding start conductors (WSC) and winding end conductors (WEC). For example, the winding start conductor (WSC) of wire 1 in 25 slots becomes the winding end conductor (WEC) of wire 4 in 40 slots. Also, the winding start conductor (WSC) of wire 4 in 25 slots becomes the winding end conductor (WEC) of wire 1 in 14 slots.

[0069] Figure 20 is a connection diagram in which the winding start conductor and winding end conductor are each connected by one segment conductor, as opposed to the connection diagram in Figure 19. The notation of symbols and the like is the same as in Figure 19, so explanations will be omitted. Note that the connection between winding start conductors (WSC) is indicated as WSX, and the connection between winding end conductors (WEC) is indicated as WEX.

[0070] 21A, 21B, and 21C are a development view, a circumferential view, and a top view of a rectangular conductor segment corresponding to the connection portion (WSX) between the winding start conductors (WSC) in Fig. 20. The rectangular conductor segment 60 includes a top portion 61, an oblique side portion 62, a straight portion 63, a twisted portion 64, and a joint portion 65.

[0071] 22A and 22B are a development view and a top view of a rectangular conductor segment corresponding to the connection portion (WEX) between the winding end conductors (WEC) in Fig. 20. The rectangular conductor segment 70 includes a top portion 71, a hypotenuse portion 72, a straight portion 73, a twisted portion 74, and a joint portion 75.

[0072] Figure 23 is a winding diagram for one phase of the stator winding 102 when the four segment conductors described in Figures 21A to 21C, 22A, and 22B are applied to the connection of the winding start conductor (WSC) and the winding end conductor (WEC). Figure 24 is an enlarged view of part A in Figure 23. In Figure 24, the winding start conductor is labeled WSC and the winding end conductor is labeled WEC.

[0073] Next, the attachment of the wiring member 91 for supplying power to the stator winding 102 of the stator 100 will be described with reference to Figures 25 and 26. Figure 25 is a perspective view of one phase of winding, illustrating the attachment of the wiring member 91 in the axial direction of the stator. In Figure 25, the winding start conductor is designated WSC, the axial direction is designated RD, and the radial direction is designated RD. Figure 26 is a perspective view of one phase of winding, illustrating the attachment of the wiring member 91 in the radial direction of the stator. In Figure 26, the winding start conductor is designated WSC, the axial direction is designated RD, and the radial direction is designated RD. The wiring member 91 is joined by partially peeling off the insulating coating of the U-shaped segment conductor.

[0074] By devising a layout of the crossover wires, which is a feature of the sixth embodiment, it is possible to reduce the number of coil varieties, and since the start and end conductors are arranged adjacent to each other, wiring work is made easier. Furthermore, by making the start and end conductors U-shaped segment conductors, the wiring work can be simplified, and a wiring board is no longer necessary, making it possible to reduce the size and cost. Furthermore, since the wiring members can be arranged in any location, it is possible to design a layout that meets the requirements.

[0075] As described above, the rotating electric machine of the sixth embodiment can reduce the number of welds for crossover wires, can connect a single phase without using a connection plate, and can achieve a rotating electric machine that achieves a smaller and less expensive stator. Furthermore, it is possible to reduce the number of coil types, simplify the connection work, and design a layout that meets requirements.

[0076] Seventh Embodiment A rotating electric machine according to a seventh embodiment is configured such that a temperature measuring element is provided in the stator winding.

[0077] The rotating electrical machine of embodiment 7 will be described with reference to Figures 27, 28, 29, and 30, which show the layout of temperature measuring elements relative to the windings, focusing on the differences from embodiment 1. In the drawings of embodiment 7, parts that are the same as or equivalent to those of embodiment 1 are given the same reference numerals.

[0078] Fig. 27 is a layout diagram in which temperature measuring elements 92 are arranged on the straight portions of the tops of the crossover wires of each phase of the stator winding 102 of the stator 100. Fig. 28 is a layout diagram in which temperature measuring elements 92 are arranged on the straight portions of the oblique sides of the crossover wires of each phase of the stator winding 102 of the stator 100. In Figs. 27 and 28, U indicates the U-phase winding, V indicates the V-phase winding, and W indicates the W-phase winding.

[0079] By providing a straight line shape to the top and oblique sides of the crossover wires of each phase of the stator winding 102 without molding or twisting (i.e., leaving the parts unprocessed as segment conductors), the installation of the temperature measuring element 92 that measures the conductor temperature is made easier, measurement responsiveness is improved, and accurate temperature measurement is made possible.

[0080] Fig. 29 is a layout diagram in which temperature measuring elements 92 are arranged on the straight sections between the tops of the crossover wires of each phase of the stator winding 102 of the stator 100. Fig. 30 is a layout diagram in which temperature measuring elements 92 are arranged on the straight sections between the oblique sides of the crossover wires of each phase of the stator winding 102 of the stator 100. In Figs. 29 and 30, U indicates the U-phase winding, V indicates the V-phase winding, and W indicates the W-phase winding.

[0081] By disposing the temperature measuring elements 92 between each phase of the stator winding 102, in the case of a three-phase motor, the conductor temperature can be measured with two temperature measuring elements, which makes it possible to reduce component costs.

[0082] By adopting the configuration of embodiment 7, i.e., by installing temperature measuring elements in the stator winding, the temperature of the stator winding can be measured with high accuracy and workability can be improved. Furthermore, when temperature measuring elements are installed between the phases of the stator winding, the number of temperature measuring elements can be reduced, thereby reducing costs.

[0083] As described above, according to the rotating electric machine of the seventh embodiment, the number of welds of the crossover wires can be reduced, a single phase can be connected without using a connection plate, and a rotating electric machine can be obtained that realizes a smaller and less expensive stator. Furthermore, the temperature of the stator winding can be measured with high accuracy.

[0084] Although various exemplary embodiments and examples are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are anticipated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0085] 100 Stator, 101 Stator core, 102 Stator winding, 1000 Rotating electric machine, 10 Flat rectangular segment conductor, 11, 21, 31, 41, 51, 61, 71 Top, 12, 22, 32, 42, 52, 62, 72 Oblique side portion, 13, 23, 33, 43, 53, 63, 73 Straight portion, 14, 24, 34, 44, 54, 64, 74 Twist portion, 15, 25, 35, 45, 46, 55, 56, 65, 75 Joint portion, 20, 30, 40, 50, 60, 70 Flat rectangular segment conductor, 40a Straight flat rectangular segment conductor.

Claims

1. A rotating electric machine having a stator constructed by mounting a stator winding on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, n being an even number of 4 or greater, and the slots are equipped with conductor wires numbered 1 to n arranged in multiple layers in the radial direction, wherein in each phase of the rotating electric machine, the conductor wire structure is formed by connecting the plurality of conductor wires in series or in parallel, wherein q is a natural number of 2 or greater, and the stator has q number of slots per phase per pole, and wherein the stator has a plurality of groups which are collections of a plurality of conductor wires of the same phase housed in adjacent slots, and the plurality of groups of the same phase are arranged equally spaced apart in the circumferential direction at a slot pitch of the number of phases of the rotating electric machine × q, and wherein different groups of the same phase are connected using a plurality of crossover wires connecting any one of the number 1 wires of one group to any one of the number n wires of the other group, and the slot pitch of the multiple crossover wires is not constant, and there are a plurality of types of crossover wires with different slot pitches.

2. A rotating electric machine according to claim 1, wherein the stator windings connect adjacent groups of wires 2 to (n-1) arranged in the slots.

3. A rotating electric machine according to claim 1 or 2, wherein the crossover wires of the stator windings connect adjacent groups of the stator windings.

4. A rotating electric machine according to any one of claims 1 to 3, wherein the crossover wire is a U-shaped segment conductor.

5. A rotating electric machine according to any one of claims 1 to 4, wherein the stator winding is a full-pitch winding.

6. A rotating electric machine according to any one of claims 1 to 4, wherein the stator winding is a fractional pitch winding.

7. A rotating electric machine according to any one of claims 1 to 6, wherein the stator winding is a rectangular segment conductor.

8. A rotating electric machine according to claim 7, wherein the rectangular segment conductor of the crossover wire is arranged such that the longitudinal direction of the cross section at the top is perpendicular to the axial direction of the rotating electric machine.

9. A rotating electric machine according to claim 7, wherein the rectangular segment conductor of the crossover wire is arranged so that the short side direction of the cross section at the top is perpendicular to the axial direction of the rotating electric machine.

10. A rotating electric machine according to claim 1, wherein the conductor wires of wires 2 to (n-1) arranged in the slots are segment conductors formed from two straight conductors.

11. A rotating electric machine according to claim 1 or claim 10, wherein the crossover wire is a segment conductor formed from two straight conductors.

12. A rotating electric machine according to claim 1, wherein the stator windings are arranged in groups in which the winding start conductors and winding end conductors of the same phase are adjacent to each other.

13. A rotating electric machine according to claim 1, wherein the crossover wires are U-shaped segment conductors having a peak, a slant portion, a straight portion, a twisted portion, and a joint portion, the slot pitch between the peaks is the same, the angle of the slant portion of the No. 1 wire placed in the slot is the same, the axial height of the peaks is the same, and the angle of the slant portion of the No. n wire placed in the slot is different.

14. A rotating electric machine according to claim 1, wherein the crossover wires are U-shaped segment conductors having a peak, a hypotenuse, a straight portion, a twisted portion, and a joint portion, and the angles of the hypotenuses of the No. 1 wires placed in the slots are the same, the angles of the hypotenuses of the No. n wires placed in the slots are the same, the axial heights of the peaks are the same, and the slot pitches between the peaks are different.

15. A rotating electric machine according to claim 1, wherein the crossover wires are U-shaped segment conductors having a peak, a slant portion, a straight portion, a twisted portion, and a joint portion, and the angles of the slant portions of the No. 1 wires placed in the slots are the same, the angles of the slant portions of the No. n wires placed in the slots are the same, the pitch between the peaks is the same, and the axial heights of the peaks are different.

16. The rotating electric machine according to claim 1, wherein the stator windings are connected in series and in parallel such that the number of slots per pole per phase, q, is greater than or equal to the number of parallel connections, 2N, where N is a natural number, and the stator windings have connecting conductors that connect the No. 1 wires arranged in the slots of any of the groups to the No. 1 wires arranged in the slots of the adjacent groups, or the No. n wires arranged in the slots of any of the groups to the No. n wires arranged in the slots of the adjacent groups.

17. A rotating electric machine as set forth in claim 1, wherein, in the case of a parallel connection of the stator windings that satisfies the condition that the number of slots per pole per phase, q, is less than the number of parallel windings, 2N, where N is a natural number, the first wire and the nth wire arranged in the slots of the same group are used as winding start conductors.

18. A rotating electric machine as set forth in claim 17, wherein, when the smallest slot number in the group is U1 and the largest slot number is Uq, and m is a natural number, the stator winding has a crossover wire connecting U1 of the first wire arranged in the slot of any of the groups with Uq of the nth wire arranged in the slot of an adjacent group, and a crossover wire connecting Um+1 of the first wire arranged in the slot of any of the groups with Um of the nth wire arranged in the slot of an adjacent group.

19. A rotating electric machine according to claim 18, wherein the winding start conductor of the stator winding is made up of N segment conductors, and a wiring member is provided on the connection side where the winding start conductor and winding end conductor are installed.

20. A rotating electric machine according to claim 18 or claim 19, wherein the stator winding has N segment conductors as winding end conductors, and is provided with wiring members on the connection side where the winding start conductor and the winding end conductor are installed.

21. A rotating electric machine according to claim 19 or 20, wherein the wiring member is provided in the axial direction of the rotating electric machine.

22. A rotating electric machine according to claim 19 or 20, wherein the wiring members are provided in the radial direction of the rotating electric machine.

23. A rotating electric machine according to claim 1, wherein the crossover wire is a U-shaped segment conductor having a top portion, a slant portion, a straight portion, a twisted portion, and a joint portion, and wherein a temperature measuring element is provided at the top portion or the slant portion of the crossover wire.

24. A rotating electric machine according to claim 1, wherein the crossover wire is a U-shaped segment conductor having a top portion, a slant portion, a straight portion, a twisted portion, and a joint portion, and wherein a temperature measuring element is provided in contact between the top portions or the slant portions of two or more of the crossover wires.

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