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

Technical Field

[0001] This disclosure relates to a rotating electrical machine.

Background Art

[0002] In the windings of a rotating electrical machine, in order to meet various target performances within a limited range, parameters such as the number of slots per pole per phase, lap winding or parallel winding (number of parallel paths), full-pitch winding or short-pitch winding are appropriately designed, and means to achieve the target are used.

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

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the rotating electrical machine of Patent Document 1, when connecting the outermost end portions to each other, the size increases in the radial or axial direction of the coil end. When connecting the innermost end portions to each other, it is necessary to consider that the rotor and the cross wires do not interfere during rotor assembly and driving. Also, in both cases, the number of members and welding points increases, resulting in a problem of increased cost due to increased man-hours. Furthermore, in the rotating electric machine described in Patent Document 2, power can be supplied to each segment conductor by using a connection plate, but this results in an increased size in the outer diameter or axial direction of the coil end, and there is a problem of increased cost due to the use of the connection plate.

[0006] This disclosure provides a technology to solve the above-mentioned problems, and offers a rotating electric machine that reduces the number of welding points for wire crossings, allows single-phase connection without using connection plates, and enables miniaturization and cost reduction of the stator. [Means for solving the problem]

[0007] The rotating electric machine of this disclosure has a stator configured by mounting stator windings on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are provided 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 a plurality of the conductor wires in series or in parallel, where q is a natural number of 2 or more, and the stator has a plurality of groups of a plurality of conductor wires of the same phase housed in adjacent slots, where q is the number of slots per pole per phase, and the plurality of groups of the same phase are arranged equally apart 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 using a plurality of connecting wires that connect the conductor wire number 1 of one group to the conductor wire number n of the other group, and there are a plurality of types of connecting wires with different slot pitches. The rotating electric machine of this disclosure has a stator configured by mounting stator windings on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are provided 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 plurality of the conductor wires are connected in series or parallel to form a conductor wire structure, where q is a natural number of 2 or more, and the stator has a plurality of groups of the same phase conductor wires housed in adjacent slots, where q is the number of slots per pole per phase, and the plurality of groups of the same phase are arranged equally apart in the circumferential direction with a slot pitch of the number of phases of the rotating electric machine × q, where q is the number of slots per pole per phase ≥ 3, and in the stator windings formed of segment coils, the jumpers connecting adjacent groups of the same phase have at least a portion of different slot pitches. [Effects of the Invention]

[0008] According to the rotating electric machine of this disclosure, the number of welding points for wire crossovers can be reduced, single phases can be connected without using connection plates, and a rotating electric machine that achieves miniaturization and cost reduction of the stator can be obtained. [Brief explanation of the drawing]

[0009] [Figure 1] This is an overall diagram of the stator configuration in a rotating electric machine according to Embodiment 1. [Figure 2] This is an explanatory diagram of the stator winding arrangement in a rotating electric machine according to Embodiment 1. [Figure 3] This is a front view of a rectangular segment conductor in a rotating electric machine according to Embodiment 1. [Figure 4] Figure 4A is an exploded view of the rectangular segment conductor in a rotating electric machine according to Embodiment 1. Figure 4B is a top view of the rectangular segment conductor in a rotating electric machine according to Embodiment 1. Figure 4C is a bottom view of the rectangular segment conductor in a rotating electric machine according to Embodiment 1. [Figure 5]Figure 5A is an unfolded view of the crossovers of the rectangular segment conductors in a rotating electric machine according to Embodiment 1. Figure 5B is a top view of the crossovers of the rectangular segment conductors in a rotating electric machine according to Embodiment 1. [Figure 6] This is a wiring diagram for one phase of the stator winding (2 in parallel, full section winding) in a rotating electric machine according to Embodiment 1. [Figure 7] This is a wiring diagram for one phase of the stator winding (2 in parallel, short section winding) in a rotating electric machine according to Embodiment 1. [Figure 8] This is a perspective view of the stator winding for one phase in a rotating electric machine according to Embodiment 1. [Figure 9] Figure 9A is a top cross-sectional view of the wires connecting to a rectangular segment conductor in a rotating electric machine according to Embodiment 2. Figure 9B is a top cross-sectional view of the wires connecting to a rectangular segment conductor in a rotating electric machine according to Embodiment 2. [Figure 10] Figure 10A is a pre-processing view of the rectangular segment conductor in the rotating electric machine according to Embodiment 3. Figure 10B is an unfolded view of the rectangular segment conductor in the rotating electric machine according to Embodiment 3. Figure 10C is a top view of the rectangular segment conductor in the rotating electric machine according to Embodiment 3. [Figure 11] Figure 11A is an unfolded view of the crossovers of the rectangular segment conductors in a rotating electric machine according to Embodiment 3. Figure 11B is a top view of the crossovers of the rectangular segment conductors in a rotating electric machine according to Embodiment 3. [Figure 12] Figure 12A is a top view of the stator in a rotating electric machine according to Embodiment 4. Figure 12B is an outer diameter view of the stator in a rotating electric machine according to Embodiment 4. Figure 12C is an inner diameter view of the stator in a rotating electric machine according to Embodiment 3. [Figure 13] This is a wiring diagram for one phase of the stator winding (series winding, full section winding) in a rotating electric machine according to Embodiment 5. [Figure 14] This is a perspective view of one phase of the stator winding (series winding, full-section winding) in a rotating electric machine according to Embodiment 5. [Figure 15] This is a wiring diagram for one phase of the stator winding (series winding, full section winding) in a rotating electric machine according to Embodiment 5. [Figure 16] It is a perspective view of a stator winding (in series, full-pitch winding) for one phase of a rotating electrical machine according to Embodiment 5. [Figure 17] It is a wiring diagram for one phase of a stator winding (2 parallel, full-pitch winding) in a rotating electrical machine according to Embodiment 5. [Figure 18] It is a wiring diagram for one phase of a stator winding (4 parallel, full-pitch winding) in a rotating electrical machine according to Embodiment 5. [Figure 19] It is a wiring diagram for one phase of a stator winding (8 parallel, full-pitch winding) in a rotating electrical machine according to Embodiment 6. [Figure 20] It is a wiring diagram for one phase of a stator winding (8 parallel, full-pitch winding) in a rotating electrical machine according to Embodiment 6. [Figure 21] Figure 21A is a developed view of a flat-segment conductor connecting the starting conductor in a rotating electrical machine according to Embodiment 6. Figure 21B is a circumferential view of the flat-segment conductor connecting the starting conductor in a rotating electrical machine according to Embodiment 6. Figure 21C is a top view of the flat-segment conductor connecting the starting conductor in a rotating electrical machine according to Embodiment 6. [Figure 22] Figure 22A is a developed view of a flat-segment conductor connecting the ending conductor in a rotating electrical machine according to Embodiment 6. Figure 22B is a top view of the crossover wire of the flat-segment conductor connecting the ending conductor in a rotating electrical machine according to Embodiment 6. [Figure 23] It is a winding perspective view of one phase of the stator winding in a rotating electrical machine according to Embodiment 6. [Figure 24] It is an enlarged view of the winding of one phase of the stator winding in a rotating electrical machine according to Embodiment 6. [Figure 25] It is an attachment view of a wiring member to the stator winding in a rotating electrical machine according to Embodiment 6. [Figure 26] It is an attachment view of a wiring member to the stator winding in a rotating electrical machine according to Embodiment 6. [Figure 27] It is an arrangement diagram of temperature measuring elements for the stator winding in a rotating electrical machine according to Embodiment 7. [Figure 28]This is a diagram showing the arrangement of temperature-sensing elements with respect to the stator windings in a rotating electric machine according to Embodiment 7. [Figure 29] This is a diagram showing the arrangement of temperature-sensing elements with respect to the stator windings in a rotating electric machine according to Embodiment 7. [Figure 30] This is a diagram showing the arrangement of temperature-sensing elements with respect to the stator windings in a rotating electric machine according to Embodiment 7. [Figure 31] This is a wiring diagram for one phase of the stator winding (3 parallel, full section winding) in a rotating electric machine according to Embodiment 6. [Figure 32] This is a perspective view of the coil end on the connection side of the stator in a rotating electric machine according to Embodiment 6. [Figure 33] This is a wiring diagram for one phase of the stator winding (3 parallel, full section winding) in a rotating electric machine according to Embodiment 6. [Figure 34] This is a perspective view of the coil end on the connection side of the stator in a rotating electric machine according to Embodiment 6. [Figure 35] This is a wiring diagram for one phase of the stator winding (3 parallel, full section winding) in a rotating electric machine according to Embodiment 6. [Figure 36] This is a perspective view of the coil end on the connection side of the stator in a rotating electric machine according to Embodiment 6. [Figure 37] This is a wiring diagram for one phase of the stator winding (3 parallel, full section winding) in a rotating electric machine according to Embodiment 6. [Figure 38] This is a perspective view of the coil end on the connection side of the stator in a rotating electric machine according to Embodiment 6. [Figure 39] This is a perspective view of the coil end on the connection side of the stator in a rotating electric machine according to Embodiment 6. [Modes for carrying out the invention]

[0010] Embodiment 1. Embodiment 1 relates to a rotating electric machine having a stator configured by mounting stator windings on a stator core, wherein the stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are 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 a plurality of conductor wires in series or parallel, and the stator has a number of slots per pole per phase of q (where q is a natural number of 2 or more), and there are a plurality of groups of multiple conductor wires of the same phase housed in adjacent slots, and the plurality of groups of the same phase are arranged evenly apart in the circumferential direction with a slot pitch of the number of phases of the rotating electric machine × q, and different groups of the same phase are connected using a plurality of jumpers that connect the conductor wire number 1 of one group to the conductor wire number n of the other group, and there are a plurality of types of jumpers with different slot pitches.

[0011] The following description of the rotating electric machine according to Embodiment 1 is based on Figure 1, an overall diagram of the stator configuration; Figure 2, an explanatory diagram of the stator winding arrangement; Figure 3, a front view of the rectangular segment conductor; Figure 4A, an unfolded view of the rectangular segment conductor; Figure 4B, a top view of the rectangular segment conductor; Figure 4C, a bottom view of the rectangular segment conductor; Figure 5A, an unfolded view of the crossovers of the rectangular segment conductor; Figure 5B, a top view of the crossovers of the rectangular segment conductor; Figure 6, a wiring diagram for one phase of the stator winding (2 parallel, full section winding); Figure 7, a wiring diagram for one phase of the stator winding (2 parallel, short section winding); and Figure 8, a perspective view of one phase of the stator winding. In each figure, the same or corresponding parts are indicated by the same reference numeral. Furthermore, the sizes and scales of the corresponding components in the illustrations between figures are independent of each other.

[0012] First, the structure of the rotating electric machine 1000 of Embodiment 1 will be explained based on Figure 1, which is an overall configuration diagram of the stator 100. The rotating electric machine 1000 consists of a stator 100 and a rotor (not shown) that is rotatably installed inside the stator 100. The stator 100 comprises a stator core 101 and stator windings 102. In the diagram, the side where the top portion 21 of the rectangular segment conductor 20 in Figure 4A is installed, as will be explained later, that is, the side where the starting conductor (WSC) and ending conductor (WEC) are installed, is referred to as the connection side (WDS). The opposite direction from this connection side (WDS), that is, the side where the joint portion 25 of the rectangular segment conductor 20 in Figure 4A is installed, is referred to as the non-connection side (AWS).

[0013] Furthermore, in the following explanation, the rotor's axis of rotation is defined as the central axis of the stator 100, and when the terms axis (direction), diameter (direction), and circumference (direction) are used, unless otherwise specified, they refer to the central axis (direction), radius (direction), and circumference (direction) of the central axis in a cylindrical coordinate system centered on the central axis of the stator 100. Specifically, the axial direction of the stator 100 is referred to as the axial direction (XD), and the connection side (WDS) is considered the positive direction. Furthermore, a view of the stator 100 from the connection side (WDS) in the axial direction (RD) is described as a top view, a view of the stator 100 from the outer diameter side in the radial direction (RD) towards the central axis is described as an inner radial direction view, a view of the stator 100 from the outer diameter side in the radial direction (RD) towards the central axis direction is described as an outer radial direction view, and a view of the stator 100 from the central axis towards the circumferential direction is described as a circumferential direction view.

[0014] Next, the arrangement of the stator windings 102 of the stator 100 will be explained based on Figure 2. Figure 2 shows the conductor wire arrangement for one phase in a three-phase rotating electric machine, where the number of slots per pole per phase is q (where q is a natural number of 2 or more), and multiple conductor wires numbered 1 to n (where n is a natural number of 2 or more) are housed in a single radial row within one slot of circumferentially arranged slots. The circumferential distance between adjacent slots is defined as the unit slot pitch, and k times the unit slot pitch (where k is a natural number of 1 or more) is defined as the k-slot pitch. A group of adjacent q-slots (U1 to Uq) in the same phase, from wire 1 to wire n (a group of q × n conductor wires), is referred to as a group (GR). In the case of a parallel connection, the number of parallel conductors at the beginning and end of the winding of the conductor wire is expressed as 2N (where N is a natural number). In Figure 2, the radial direction is denoted as RD, the circumferential direction as PD, the inner diameter side as IS, and the outer diameter side as OS. Also, slot numbers are denoted as SN, wire 1 as 1L, wire 2 as 2L, wire 3 as 3L, ..., wire n as nL, and group as GR. Furthermore, unit slot pitch is denoted as USP, and k slot pitch as kSP.

[0015] Next, the rectangular segment conductors used in the stator windings 102 of the stator 100 will be explained based on Figures 3, 4A, 4B, 4C, 5A, and 5B.

[0016] Figure 3 is a front view of the rectangular segment conductor 10 housed at the beginning and end of the winding of track 1 and track n. The rectangular segment conductor 10 comprises 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 slanted portion 12 are located on the connection side (WDS) of the stator 100, the straight portion 13 is located within the slot of the stator core 101, and the twisted portion 14 and the joint portion 15 are located on the non-connection side (ADS) of the stator 100. The slanted portion 12 is formed in a step prior to insertion into the stator core 101. The twisted portion 14 may be formed in a step prior to insertion into the slot portion of the stator core 101, or it may be bent after it has been housed.

[0017] Figures 4A, 4B, and 4C are unfolded, top, and bottom views of a U-shaped rectangular segment conductor 20 housed in different groups of tracks 2 to n-1. Figure 4B corresponds to arrow A in Figure 4A, and Figure 4C corresponds to arrow B in Figure 4A. The rectangular segment conductor 20 comprises a top portion 21, a slanted side portion 22, a straight portion 23, a twisted portion 24, and a joint portion 25. The top portion 21 and the slanted portion 22 are located on the connection side (WDS) of the stator 100, the straight portion 23 is located within the slot of the stator core 101, and the twisted portion 24 and the joint portion 25 are located on the non-connection side (ADS) of the stator 100. The slanted portion 22 is formed in a step prior to insertion into the stator core 101. The twisted portion 24 may be formed in a step prior to insertion into the slot portion of the stator core 101, or it may be bent after it has been housed.

[0018] Figures 5A and 5B are unfolded and top views of the crossovers of U-shaped rectangular segment conductors 30 that house tracks 1 and n of different groups (GR). Figure 5B corresponds to the line C in Figure 5A. The rectangular segment conductor 30 comprises a top portion 31, a slanted side portion 32, a straight portion 33, a twisted portion 34, and a joint portion 35. The top portion 31 and the slanted portion 32 are positioned on the connection side (WDS) of the stator 100, the straight portion 33 is positioned within the slot of the stator core 101, and the twisted portion 34 and the joint portion 35 are positioned on the non-connection side (ADS) of the stator 100. The slanted portion 32 is formed in a step prior to insertion into the stator core 101. The twisted portion 34 may be formed in a step prior to insertion into the slot portion of the stator core 101, or it may be bent after it has been housed.

[0019] Next, a specific example of the winding arrangement of the stator 100 of the rotating electric machine 1000 of Embodiment 1 will be described based on Figures 6, 7, and 8. Figure 6 is a wiring diagram for a three-phase rotating electric machine using rectangular segment conductors, with q=2 slots per pole per phase, n=4 conductors per slot, 2 parallel connections, and full-section winding. For the winding start conductor (WSC) and winding end conductor (WEC) of tracks 1 and 4, the flat rectangular segment conductor 10 shown in Figure 3 is used. For all conductors other than the winding start conductor (WSC) and winding end conductor (WEC), the U-shaped flat rectangular segment conductors 20 and 30 shown in Figures 4A and 5A are used.

[0020] In Figure 6, the solid lines represent the segment conductors on the non-connected side (AWS), the dashed lines represent the rectangular segment conductors on the connected side (WDS), and the dots indicate the junction points (JP) on the non-connected side (AWS). In Figure 6, the radial direction is denoted 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. Additionally, slot numbers are denoted as SN, wire 1 as 1L, wire 2 as 2L, wire 3 as 3L, wire 4 as 4L, junctions as JP, and groups as GR. Furthermore, connecting wires are denoted as CL, the starting conductor as WSC, the ending conductor as WEC, overlapping winding sections as OWP, 6-slot pitch as 6SP, and 7-slot pitch as 7SP.

[0021] Here, we will explain how to arrange the rectangular segment conductors 10, 20, and 30 into the slots of the stator 100. In the full-segment winding shown in Figure 6, there are 2 parallel connections, with the starting conductor (WSC) being the connection side (WDS) of the first wire in slot number 20 and the first wire in slot number 14. The first wire in slot number 20 is connected to the second wire in slot number 14 at the joints 15 and 25 on one side of the rectangular segment conductor at the non-connection side (AWS) of the adjacent group (GR) in the circumferential negative (N) direction of the group (GR) where the starting conductor (WSC) is located. The other end of the rectangular segment conductor housed in the second wire in slot number 14 is also housed in the third wire in slot number 20, and at joint 25 it is connected to one joint 25 of a 6-slot pitch jumper (CL) housed in the fourth wire in slot number 14, while the other end of the 6-slot pitch jumper (CL) is housed in the first wire in slot number 8 of the adjacent group (GR).

[0022] When a section where adjacent groups (GR) are alternately connected, such as from slot number 14, track 1 to slot number 8, track 4, is designated as an overlay winding section (OWP), the connecting wires (CL) are arranged so as to overlap the overlay winding section (OWP) when viewed from the connection side (WDS) of the stator 100 in the axial direction (XD), and the overlay winding section (OWP) and the connecting wires (CL) with a 6-slot pitch are alternately arranged in the negative (N) direction of the circumferential direction (PD) and connected. When the overlapping winding section (OWP) is connected to the adjacent group (GR) in the positive (P) direction of the circumferential (PD) direction of the group (GR) that houses the starting conductor (WSC), a 7-slot pitch connecting wire (CL) is housed in the adjacent slot of the same group (GR) as the slot housing the starting conductor (WSC) and the final slot of the overlapping winding section (OWP). By alternating the overlapping winding section (OWP) and the 6-slot pitch connecting wire (CL) again, the ending conductor (WEC) is placed on the connection side (WDS) of the 4th wire of slot number 25 in the adjacent group (GR) in the positive (P) direction of the circumferential (PD) direction. By similarly positioning the first wire of slot number 14 on the other side of the starting conductor (WSC), the ending conductor (WEC) is positioned on the fourth wire of slot number 19 in the adjacent group (GR) in the positive (P) direction of the circumferential (PD) direction.

[0023] Figure 7 is a wiring diagram showing the result when the winding is changed from full-section winding to short-section winding compared to Figure 6. The instructions for writing symbols and other information are the same as in Figure 6, so the explanation is omitted. In the case of the short-section winding shown in Figure 7, the overlapping winding section (OWP) and 7-slot pitch connecting wires (CL) are arranged alternately with respect to the first wire at starting slot number 14. When the overlapping winding section (OWP) is connected to the group (GR) adjacent to the group (GR) containing the starting conductor (WSC) in the circumferential (PD) positive (P) direction, the 8-slot pitch connecting wires (CL) are housed in the group (GR) containing the final slot of the overlapping winding section (OWP) and in the adjacent slots of the same group (GR) as the starting slot. By arranging the overlapping winding section (OWP) and connecting wires (CL) alternately again, the ending conductor (WEC) is positioned on the connection side (WDS) of the fourth wire at slot number 20 in the group (GR) adjacent to the circumferential (PD) positive (P) direction. Furthermore, while the first wire in slot number 20 at the start of the winding corresponds to the fourth wire in slot number 26 at the end of the winding (WEC), the final conductor (WEC) corresponds to the fourth wire in slot number 26.

[0024] Figure 8 is a perspective view of the stator winding 102, modeled after Figure 7, where the connecting wires (CL), the starting conductor (WSC), and the ending conductor (WEC) are arranged so as to overlap the overlapping section (OWP) in the axial direction on the connection side (WDS). In Figure 8, CL1 is a crossover with a k-slot pitch, and CL2 is a crossover with a k+1-slot pitch.

[0025] By adopting the configuration of the stator 100 of the rotating electric machine 1000 of Embodiment 1, variations between full-section winding and short-section winding can be achieved. By consolidating group changes with connecting wires of different pitches and using U-shaped segment conductors for the connecting wires, the use of connection plates and irregular welding during group changes becomes unnecessary. The coil ends are made smaller, enabling lighter, less expensive, and higher-performance designs. Furthermore, since the end conductor is housed in a group adjacent to the group containing the start conductor, the start and end conductors are arranged side by side in the circumferential direction. As a result, conductors used for power supply and conductors used as neutral points are located close together, simplifying the wiring, improving workability, and enabling miniaturization and cost reduction. Furthermore, by using rectangular segment conductors, the space factor within the slot is improved, allowing heat generated by the segment conductors to be efficiently transferred to the core, thus providing high heat dissipation. Furthermore, both full-section winding and short-section winding can be formed using the same method. In the case of full-section winding, torque density can be maximized, and in the case of short-section winding, harmonic components can be suppressed, and noise and vibration can also be suppressed.

[0026] As described above, the rotating electric machine of Embodiment 1 reduces the number of welding points for wire crossovers, allows for single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator.

[0027] Embodiment 2. Embodiment 2 relates to the appropriate selection of the top cross-sectional shape of the flat rectangular segment conductor of the connecting wire.

[0028] This will be explained based on Figures 9A and 9B, which show cross-sectional views of the top of the wires connecting the rectangular segment conductors in the rotating electric machine of Embodiment 2. In the drawings of Embodiment 2, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals.

[0029] Figures 9A and 9B are cross-sectional views of the top portion 31 of the rectangular segment conductor 30 of the crossover wire (CL). Figures 9A and 9B correspond to the view taken by arrow D in Figure 5B of Embodiment 1. In Figures 9A and 9B, the longitudinal direction is labeled LD, the transverse direction is labeled SD, and the insulating coating is labeled IL. Figure 9A shows a configuration in which the longitudinal direction (LD) of the flat rectangular segment conductor 30 of the connecting wire (CL) is arranged perpendicular to the axial direction (XD). Figure 9B shows a configuration in which the short side (SD) of the rectangular segment conductor 30 of the connecting wire (CL) is arranged 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 top portion 31 of the connecting wire (CL) is located at the axial end of the stator winding 102. Therefore, the axial dimension of the coil end can be reduced by the difference between the long side and the short side, making it possible to minimize it. Furthermore, when the short side (SD) is positioned perpendicular to the axial direction (XD), the distance between the tops 31 of the connecting wires (CL) arranged in the circumferential direction (PD) becomes the maximum, allowing for a larger insulation space distance to be set.

[0031] As described above, the rotating electric machine of Embodiment 2 reduces the number of welding points for the wires, allows single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, by appropriately selecting the top cross-sectional shape of the flat rectangular segment conductor of the wires, the axial dimension of the coil end can be minimized, or the insulation distance of the top of the wires can be increased.

[0032] Embodiment 3. The rotating electric machine of Embodiment 3 uses a U-shaped segment conductor formed from two straight conductors.

[0033] The differences between the rotating electric machine of Embodiment 3 and Embodiment 1 will be explained, focusing on the differences, based on Figure 10A, which is a pre-processing diagram of the rectangular segment conductor; Figure 10B, which is an unfolded diagram of the rectangular segment conductor; Figure 10C, which is a top view of the rectangular segment conductor; Figure 11A, which is an unfolded diagram of the wires connecting the rectangular segment conductor; and Figure 11B, which is a top view of the wires connecting the rectangular segment conductor. In the drawings of Embodiment 3, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals. Note that Figure 10C corresponds to arrow E in Figure 10B, and Figure 11B corresponds to arrow F in Figure 11A. To distinguish it from Embodiment 1, the U-shaped segment conductor housed from track 2 to track n-1 is designated as 40, and the U-shaped segment conductor for the connecting track is designated as 50.

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

[0035] Figure 10A shows the straight, rectangular segment conductor 40a before processing. In Figures 10B and 10C, the rectangular segment conductor 40 comprises 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 slanted portion 42, and the joint portion 46 are located on the connection side (WDS) of the stator 100, the straight portion 43 is located within the slot of the stator core 101, and the twisted portion 44 and the joint portion 45 are located on the non-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 connected side (WDS), and Tb indicates the starting point of the twist on the non-connected side (ADS).

[0036] In Figures 11A and 11B, the rectangular segment conductor 50 comprises a top portion 51, a hypotenuse portion 52, a straight portion 53, a twisted portion 54, a joint portion 55, and an additional joint portion 56. The top portion 51, the slanted portion 52, and the joint portion 56 are located on the connection side (WDS) of the stator 100, the straight portion 53 is located within the slot of the stator core 101, and the twisted portion 54 and the joint portion 55 are located on the non-connection side (ADS) of the stator 100. The additional joint portion 56 is joined by welding or the like.

[0037] In Embodiment 3, the connection side can be formed by a single twist using two straight rectangular segment conductors 40a, similar to the non-connection side. Therefore, if the number of conductors in the slots of the rotating electric machine 1000 changes, or if the slot pitch or stator core shaft length changes, the molding dies for the top and slanted sides that were required for the U-shaped segment conductor in Embodiment 1 become unnecessary, and the change can be made by simply changing the length of the straight segment conductor. As a result, it becomes easier to consider molding conditions when developing new models due to specification changes, jigs and fixtures become unnecessary, and significant cost reductions are possible.

[0038] As described above, the rotating electric machine of Embodiment 3 reduces the number of welding points for wire crossovers, allows for single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, it eliminates the need for molding dies and makes it easier to respond to specification changes.

[0039] Embodiment 4. Embodiment 4 of the rotating electric machine relates to a design method for avoiding interference between wires and winding end conductors.

[0040] The differences between the rotating electric machine of Embodiment 4 and Embodiment 1 will be explained, focusing on the differences, based on Figure 12A, which is a top view of the stator, Figure 12B, which is an outer diameter view of the stator, and Figure 12C, which is an inner diameter view of the stator. In the drawings of Embodiment 4, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals.

[0041] In Figure 12A, the top-to-top pitch is denoted as TP, CL1 is a conductor with a k-slot pitch, and CL2 is a conductor with a k+1-slot pitch. Also, the starting conductor (WSC) in Figure 12A may be the ending conductor (WEC). In Figure 12B, the top height is denoted as TH, and the angle of the hypotenuse of track 1 is denoted as 1LOSA. In Figure 12C, the angle of the hypotenuse of line n is denoted as nLOSA.

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

[0043] For example, consider the case where the top-to-top pitch (TP), the hypotenuse angle (1LOSA), and the top height (TH) of the k-slot pitch conductors (CL1), k+1 slot pitch conductors (CL2), and winding end conductors (WEC) are the same, while the hypotenuse angle (nLOSA) of the n-th conductor is changed for each conductor. In this case, since the top-to-top pitch (TP) is the same, the insulation distance between tops can be ensured at equal intervals. Since the hypotenuse angle (1LOSA) of the first conductors is the same, there is no need to consider interference avoidance between the first conductors themselves and with the rotor, thus reducing man-hours. Since the top height (TH) is the same, the coil end height can be reduced.

[0044] For example, consider the case where the 1st wire hypotenuse angle (1LOSA) and the nth wire hypotenuse angle (nLOSA) are the same for the k-slot pitch conductors (CL), the k+1 slot pitch conductors (CL2), and the winding end conductor (WEC), and the top height (TH) is the same, but the top pitch (TP) is changed for each conductor. In this case, since the 1st wire hypotenuse angle (1LOSA) is the same, there is no need to consider interference avoidance between the 1st wires themselves and with the rotor, thus reducing man-hours. Since the 1st wire hypotenuse angle (1LOSA) and the nth wire hypotenuse angle (nLOSA) are the same, the molds for the bending process can be standardized, eliminating the need for mold design. Setup changes for each segment conductor can also be eliminated. Since the top height (TH) is the same, the coil end height can be reduced.

[0045] For example, consider the case where the 1st wire hypotenuse angle (1LOSA) and the nth wire hypotenuse angle (nLOSA) are the same for the k-slot pitch conductors (CL1), the k+1 slot pitch conductors (CL2), and the winding end conductor (WEC), the top-to-top pitch (TP) is the same, and the top height (TH) is changed for each type of conductor. In this case, since the 1st wire hypotenuse angle (1LOSA) is the same, there is no need to consider interference avoidance between the 1st wires themselves and with the rotor, thus reducing man-hours. Since the 1st wire hypotenuse angle (1LOSA) and the nth wire hypotenuse angle (nLOSA) are the same, the molds for the bending process can be standardized, eliminating the need for mold considerations and the need to change setups for each segment conductor. Since the top-to-top pitch (TP) is the same, the insulation distance between tops can be ensured at equal intervals.

[0046] By adopting the design method of Embodiment 4, it becomes possible to flexibly design the avoidance of interference between the wire crossovers and the end conductors according to the purpose. Therefore, it can appropriately respond to a wide range of requirements.

[0047] As described above, the rotating electric machine of Embodiment 4 reduces the number of welding points for wire crossovers, allows for single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, an appropriate method can be selected to avoid interference between wire crossovers and the end conductors of the windings, depending on the purpose.

[0048] Embodiment 5. The rotating electric machine of Embodiment 5 is configured to use connecting conductors in the stator windings.

[0049] Regarding the rotating electric machine of Embodiment 5, the differences from Embodiment 1 will be explained based on Figure 13, which is a wiring diagram of one phase of the stator winding (series, full winding); Figure 14, which is a perspective view of one phase of the stator winding (series, full winding); Figure 15, which is a wiring diagram of one phase of the stator winding (series, full winding); Figure 16, which is a perspective view of one phase of the stator winding (series, full winding); Figure 17, which is a wiring diagram of one phase of the stator winding (2 parallel, full winding); and Figure 18, which is a wiring diagram of one phase of the stator winding (4 parallel, full winding). In the drawings of Embodiment 5, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals.

[0050] Figure 13 is a wiring diagram for a three-phase rotating electric machine where the number of slots per pole per phase is q=2, the number of conductors in each slot is 4, and one phase with full winding is connected in series, with the starting conductor of the winding placed on the first wire. In Figure 13, the solid lines represent the segment conductors on the non-connected side (AWS), the dashed lines represent the segment conductors on the connected side (WDS), and the dots indicate the junction points (JP) on the non-connected side (AWS). In Figure 13, the radial direction is denoted 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. Additionally, slot numbers are denoted as SN, wire 1 as 1L, wire 2 as 2L, wire 3 as 3L, wire 4 as 4L, the junction point as JP, and the group as GR. Furthermore, connecting conductors are denoted as CC, the starting conductor as WSC, the ending conductor as WEC, the overlapping winding section as OWP, the 6-slot pitch as 6SP, and the 7-slot pitch as 7SP.

[0051] In the wiring diagram in Figure 13, the fourth wire of slot 19 is connected to the fourth wire of slot 25 in the adjacent group (GR) by a connecting conductor (CC). Furthermore, the starting conductor (WSC) of the 13-slot wire becomes the ending conductor (WEC) of the 20-slot wire.

[0052] Figure 14 is a stator winding diagram for one phase of the stator winding 102 in series connection, when the starting conductor (WSC) is placed on the first wire, compared to Figure 13. In Figure 14, the connecting conductor is labeled CC, the starting conductor is labeled WSC, and the ending conductor is labeled WEC. When the starting conductor (WSC) is placed on the first wire, the ending conductor (WEC) is also placed on the first wire, and the connecting conductor (CC) is placed on the outer diameter side (OS). This prevents the conductors from being placed 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 where the number of slots per pole per phase is q=2, the number of conductors in each slot is 4, and one phase of a fully wound circuit is connected in series, with the starting conductor (WSC) placed on the 4th wire. The instructions for writing symbols and other information are the same as in Figure 13, so no explanation is provided.

[0054] In the wiring diagram in Figure 15, the first track of slot 14 is connected to the first track of slot 20 in the adjacent group (GR) by a connecting conductor (CC). Furthermore, the starting conductor (WSC) of the 4th wire in slot 19 becomes the ending conductor (WEC) of the 4th wire in slot 25.

[0055] Figure 16 is a stator winding diagram for one phase of the stator winding 102 in series connection when the starting conductor (WSC) is placed on the fourth wire. In Figure 16, the connecting conductor is labeled CC, the starting conductor is labeled WSC, and the ending conductor is labeled WEC. When the starting conductor (WSC) is placed on the 4th wire, the ending conductor (WEC) is also placed on the 4th wire, the connecting conductor (CC) is placed on the inner diameter side (IS), and the starting conductor (WSC) and ending conductor (WEC) are placed on the outer diameter side (OS). This makes the connection process for each phase easier and improves work efficiency.

[0056] Figure 17 shows a wiring diagram for a three-phase rotating electric machine with q=4 slots per pole per phase, 4 conductors per slot, 2 parallel connections, and full winding (q ≥ 2N parallel connections). The instructions for writing symbols and other information are the same as in Figure 13, so no explanation is provided. If the starting conductor (WSC) is set on track 1 of any group (GR), then by installing a connecting conductor (CC) that connects tracks 4 of adjacent groups (GR), the ending conductor (WEC) will be placed on track 1 of the group (GR) adjacent to the starting conductor (WSC).

[0057] In the wiring diagram in Figure 17, the fourth wire of slot 26 is connected to the fourth wire of slot 38 in the adjacent group (GR) with a connecting conductor (CC), and the fourth wire of slot 28 is connected to the fourth wire of slot 40 in the adjacent group (GR) with a connecting conductor (CC). Furthermore, the starting conductor (WSC) of the first wire in the 26-slot configuration becomes the ending conductor (WEC) of the first wire in the 14-slot configuration. Similarly, the starting conductor (WSC) of the first wire in the 28-slot configuration becomes the ending conductor (WEC) of the first wire in the 16-slot configuration.

[0058] Figure 18 shows a wiring diagram for a three-phase rotating electric machine with q=4 slots per pole per phase, 4 conductors per slot, 4 parallel connections, and full winding (q ≥ 2N parallel connections). The instructions for writing symbols and other information are the same as in Figure 13, so no explanation is provided. If the starting conductor (WSC) is set on track 1 of any group (GR), then by installing a connecting conductor (CC) that connects tracks 4 of adjacent groups (GR), the ending conductor (WEC) will be placed on track 1 of the group (GR) adjacent to the starting conductor (WSC).

[0059] In the wiring diagram of Figure 18, the fourth wire of lot 25 is connected to the fourth wire of slot 37 in the adjacent group (GR) with a connecting conductor (CC). The fourth wire of lot 26 is connected to the fourth wire of slot 38. The fourth wire of lot 27 is connected to the fourth wire of slot 39. The fourth wire of lot 28 is connected to the fourth wire of slot 40. For example, the starting conductor (WSC) of the first wire in a 25-slot cable will have the ending conductor (WEC) of the first wire in a 13-slot cable. Similarly, the starting conductor (WSC) of the first wire in a 28-slot cable will have the ending conductor (WEC) of the first wire in a 16-slot cable.

[0060] As can be seen from Figures 17 and 18, even when the number of slots per pole per phase q ≥ the number of parallel connections 2N, the connecting conductor (CC) is placed on the wire opposite to the wire on which the starting conductor (WSC) and ending conductor (WEC) are placed, just as in the case of series connection.

[0061] The configuration of Embodiment 5, that is, by employing connecting conductors in the stator windings of the rotating machine, enables series-parallel connection of the stator windings, allowing for wiring according to the purpose. Furthermore, since the starting and ending conductors are arranged in adjacent groups, the workability during connection is improved. In addition, a connection plate that extends around the entire circumference of the coil end is unnecessary, enabling miniaturization and cost reduction.

[0062] As described above, the rotating electric machine of Embodiment 5 reduces the number of welding points for wire crossovers, allows single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, by employing connecting conductors, series and parallel connection of stator windings is possible, enabling wiring according to the purpose. In addition, the winding start and end points and connecting conductors can be set at any location on the inner and outer diameters, allowing for a layout according to the purpose.

[0063] Embodiment 6. The rotating electric machine of Embodiment 6 can accommodate winding configurations where the number of slots per pole per phase q < number of parallel connections 2N by devising the arrangement of the stator wires.

[0064] Figures 19 and 20 show the wiring diagram for one phase of the stator winding (8 parallel, all sections wound) for the rotating electric machine of Embodiment 6, Figure 21A is an unfolded view of the rectangular segment conductor connecting the starting conductor, Figure 21B is a circumferential view of the rectangular segment conductor, Figure 21C is a top view of the rectangular segment conductor, Figure 22A is an unfolded view of the rectangular segment conductor connecting the ending conductor, Figure 22B is a top view of the rectangular segment conductor, Figure 23 is a perspective view of one phase of the stator winding, Figure 24 is an enlarged view of one phase of the stator winding, and Figure 24 is a perspective view of one phase of the stator winding. Based on Figures 31 (winding perspective), 32 (stator connection side coil end), 33 (one phase winding of the stator winding), 34 (stator connection side coil end), 35 (one phase winding of the stator winding), 36 (stator connection side coil end), 37 (one phase winding of the stator winding), 38 (stator connection side coil end), 39 (stator connection side coil end), and Figures 25 and 26 (mounting diagrams of wiring members to the stator winding), the differences from Embodiment 1 will be explained in detail. In the drawings of Embodiment 6, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals.

[0065] Figure 19 is a wiring diagram for a three-phase rotating electric machine with q=4 slots per pole per phase, 4 conductors per slot, 8 parallel connections, and full winding (q<2N number of parallel connections). In Figure 19, the solid lines represent the segment conductors on the non-connected side (AWS), the dashed lines represent the segment conductors on the connected side (WDS), and the dots indicate the junction points (JP) on the non-connected side (AWS). In Figure 19, the radial direction is denoted 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. Additionally, slot numbers are denoted as SN, wire 1 as 1L, wire 2 as 2L, wire 3 as 3L, wire 4 as 4L, junction points as JP, and groups as GR. Furthermore, connecting wires are denoted as CL, the starting conductor as WSC, the ending conductor as WEC, and the overlapping winding section as OWP.

[0066] First, the characteristics of the crossover in Embodiment 6 will be explained in general terms. The device is characterized by having a winding start conductor (WSC) placed on the 1st and nth wires of the same group (GR), a connecting wire (CL3) connecting U1 on the 1st wire of any group (GR) to Uq on the nth wire of an adjacent group (GR), and a connecting wire (CL4) connecting Um+1 (where m is a natural number) on the 1st wire of any group (GR) to Um of an adjacent group (GR).

[0067] Next, we will specifically explain the arrangement of the connecting wires (CLs) in the wiring diagram shown in Figure 19. In Figure 19, the crossover (CL3) connects the first track of slot 1, corresponding to U1 of track 1 in any group, to the fourth track of slot 16, corresponding to Uq of track n in the adjacent group. Similarly, the crossover (CL4) connects the first track of slot 2, corresponding to Um+1 (when m=1) of track 1 in any group (GR), to the fourth track of slot 13, corresponding to Um (when m=1) in the adjacent group (GR). Likewise, the crossover (CL4) connects the first track of slot 3 to the fourth track of slot 14, and connects the first track of slot 4 to the fourth track of slot 15. For the sake of simplicity, three crossovers (for example, Slot 1, Track 1 → Slot 16, Track 4) are referred to as CL4.

[0068] Here, we will explain the correspondence between the starting conductor (WSC) and the ending conductor (WEC). For example, the starting conductor (WSC) of the 1st wire in a 25-slot cable will have the 4th wire in a 40-slot cable become the ending conductor (WEC). Also, the starting conductor (WSC) of the 4th wire in a 25-slot cable will have the 1st wire in a 14-slot cable become the ending conductor (WEC).

[0069] Figure 20 is a wiring diagram of Figure 19, but showing the case where the starting conductor and the ending conductor are connected with a single segment conductor. The instructions for writing symbols and other information are the same as in Figure 19, so no explanation is provided. Note that the connection point between the starting conductors (WSC) is denoted as WSX, and the connection point between the ending conductors (WEC) is denoted as WEX.

[0070] Figures 21A, 21B, and 21C are unfolded views, circumferential views, and top views of the rectangular segment conductor corresponding to the connection portion (WSX) between the starting conductors (WSC) in Figure 20. The rectangular segment conductor 60 comprises a top portion 61, a slanted side portion 62, a straight portion 63, a twisted portion 64, and a joint portion 65.

[0071] Figures 22A and 22B are unfolded and top views of the rectangular segment conductors corresponding to the connection points (WEX) between the winding end conductors (WEC) in Figure 20. The rectangular segment conductor 70 comprises a top portion 71, a slanted side portion 72, a straight portion 73, a twisted portion 74, and a joint portion 75.

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

[0073] Here, we summarize the features and effects of this embodiment as described in Figure 19. In a rotating electric machine having a stator configured by mounting stator windings on a stator core, the stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are 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 multiple conductor wires in series or parallel, where q is a natural number of 2 or more, and the stator has a plurality of groups of multiple conductor wires of the same phase housed in adjacent slots, where q is the number of slots per pole per phase, and the plurality of groups of the same phase are arranged equally apart in the circumferential direction with a slot pitch of the number of phases of the rotating electric machine × q, and the number of slots per pole per phase q ≥ 3, and in the stator windings formed of segment coils, the jumpers connecting adjacent groups of the same phase have at least some different slot pitches. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, since wiring is unnecessary, labor costs can be reduced.

[0074] Furthermore, the characteristics of the wiring diagram in Figure 19 will be explained in general terms. If the smallest slot number in a group is U1 and the largest slot number is Uq, and m is a natural number, then the stator winding has a connecting wire that connects U1, the first wire located in a slot in any group, to Uq, the nth wire located in a slot in an adjacent group, and a connecting wire that connects Um+1, the first wire located in a slot in any group, to Um, the nth wire located in a slot in an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, it eliminates the need for wiring, reducing labor costs. Additionally, because U1 to Uq are connected evenly, circulating current can be reduced, leading to increased efficiency.

[0075] Furthermore, the wiring diagram in Figure 19 is characterized by the fact that crossovers connect track 1 of a certain group to track n of an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, since wiring is unnecessary, labor costs are reduced.

[0076] Next, while the wiring diagram in Figure 19 had q=4 slots per pole per phase and 4 and 8 parallel conductors per slot, we will now explain the case where q=3 slots per pole per phase and 4 and 3 parallel conductors per slot. Figure 31 is a wiring diagram for a three-phase rotating electric machine with q=3 slots per pole per phase, 4 conductors per slot, 3 parallel connections, and full winding. The notation of symbols and other details is the same as in Figure 19, so no explanation is provided. In Figure 31, the crossovers connecting slot numbers 10 and 19, slot numbers 11 and 20, and slot numbers 12 and 21 on track 1 have the same slot pitch (9SP). In contrast, the crossovers connecting slot numbers 28 and 39, slot numbers 29 and 37, and slot numbers 30 and 38 on track n (track 4 in the figure) have different slot pitches (11SP and 8SP). In this configuration, the crossover connects track n of one group to track n of an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, since wiring work is unnecessary, labor costs can be reduced.

[0077] Figure 32 is a perspective view of the coil end WDS on the connection side of the stator 100, corresponding to the wiring diagram in Figure 31. It shows the 9-slot pitch wires on the inner diameter side and the 11-slot pitch and 8-slot pitch wires on the outer diameter side.

[0078] Another example in the case of q=3 slots per pole per phase, 4 conductors per slot, and 3 in parallel is explained in Figure 33. Figure 33 is a wiring diagram for a three-phase rotating electric machine with q=3 slots per pole per phase, 4 conductors per slot, 3 parallel connections, and full winding. The notation of symbols and other details is the same as in Figure 19, so no explanation is provided. In Figure 33, the crossovers connecting slot numbers 10 and 21, slot numbers 11 and 19, and slot numbers 12 and 20 on track 1 have different slot pitches (8SP and 11SP). In contrast, the crossovers connecting slot numbers 28 and 37, slot numbers 29 and 38, and slot numbers 30 and 39 on track n (track 4 in the figure) have the same slot pitch (9SP). In this configuration, the crossover connects track 1 of one group to track 1 of an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, since wiring work is unnecessary, labor costs can be reduced.

[0079] Figure 34 is a perspective view of the coil end WDS on the connection side of the stator 100, corresponding to the wiring diagram in Figure 33. It shows the wires connecting at 8-slot pitch and 11-slot pitch on the inner diameter side, and the wires connecting at 9-slot pitch on the outer diameter side.

[0080] Furthermore, another example in the case of q=3 slots per pole per phase, 4 conductors per slot, and 3 parallel connections is explained in Figure 35. Figure 35 is a wiring diagram for a three-phase rotating electric machine with q=3 slots per pole per phase, 4 conductors per slot, 3 parallel connections, and full winding. The notation of symbols and other details is the same as in Figure 19, so no explanation is provided. In Figure 35, the crossovers connecting slot numbers 10 and 21, slot numbers 11 and 19, and slot numbers 12 and 20 on track 1 have different slot pitches (11SP and 8SP). In contrast, the crossovers connecting slot numbers 28 and 39, slot numbers 29 and 37, and slot numbers 30 and 38 on track n (track 4 in the figure) are composed of different slot pitches (11SP and 8SP). In this configuration, a crossover connects track 1 of one group to track 1 of an adjacent group, and another crossover connects track n of one group to track n of an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, since wiring work is unnecessary, labor costs can be reduced.

[0081] Figure 36 is a perspective view of the coil end WDS on the connection side of the stator 100, corresponding to the wiring diagram in Figure 35. It shows the 8-slot pitch and 11-slot pitch wire connections on the inner diameter side, and the 8-slot pitch and 11-slot pitch wire connections on the outer diameter side.

[0082] Furthermore, another example in the case of q=3 slots per pole per phase, 4 conductors per slot, and 3 parallel connections is explained in Figure 37. Figure 37 is a wiring diagram for a three-phase rotating electric machine with q=3 slots per pole per phase, 4 conductors per slot, 3 parallel connections, and full winding. The notation of symbols and other details is the same as in Figure 19, so no explanation is provided.

[0083] Figure 37 shows a crossover (CL5) connecting slot number 30 of track 1 in a certain group to slot number 37 of track n (track 4 in the figure) in an adjacent group, a crossover (CL6) connecting slot number 28 of track 1 to slot number 38 of track n in an adjacent group, and a crossover (CL7) connecting slot number 29 of track 1 to slot number 39 of track n in an adjacent group. In this configuration, if m is a natural number, the crossover connects Uq, the first track of one group, to U1, the nth track of an adjacent group, and another crossover connects Um, the first track of one group, to Um+1, the nth track of an adjacent group. This configuration eliminates unnecessary connection coils and junction boards, enabling miniaturization and cost reduction. Furthermore, it eliminates the need for wiring, reducing labor costs. Additionally, because U1 to Uq can be connected evenly, circulating current can be reduced, leading to increased efficiency.

[0084] Figure 38 is a perspective view of the connection-side coil end WDS of the stator 100, corresponding to the wiring diagram in Figure 37. It shows a connecting wire (CL5) that connects slot number 30 of line 1 to slot number 37 of line 4 in the adjacent group, a connecting wire (CL6) that connects slot number 28 of line 1 to slot number 38 of line 4 in the adjacent group, and a connecting wire (CL7) that connects slot number 29 of line 1 to slot number 39 of line 4 in the adjacent group. In Figure 38, the connecting wire (CL5) is avoided by connecting wires (CL6) and (CL7) on the radial outer side of the stator 100. In Figure 38, JJ indicates that "one connecting wire is avoided by two connecting wires on the radial outer side." In this configuration, interference between wires with different slot pitches is avoided on the radial outer diameter side of the stator 100. As a result, by avoiding interference between wires with different slot pitches on the radial outer diameter side, unnecessary connecting wires and connection plates can be reduced, enabling miniaturization and cost reduction. Furthermore, wiring work is unnecessary, thus reducing man-hours. In addition, the outer diameter of the coil end can be reduced, allowing for miniaturization of the rotating electric machine.

[0085] Next, Figure 39 illustrates how to avoid interference between wires with different slot pitches in the axial direction of the stator 100. Figure 39 is a perspective view of the WDS on the connection side of the stator 100. Although the corresponding winding arrangement diagram is omitted, it shows that the jumper wire (CL8) avoids two other jumper wires (CL9 and CL10) in the axial direction of the stator 100. Figure 39 shows that KK represents "one crossover avoiding two crossovers in the axial direction." In this configuration, interference between wires with different slot pitches is avoided in the axial direction of the stator 100. As a result, by avoiding interference between wires with different slot pitches in the axial direction, unnecessary connecting wires and junction plates can be reduced, enabling miniaturization and cost reduction. Furthermore, wiring work is unnecessary, thus reducing labor costs. In addition, the outer diameter of the coil end can be reduced, allowing for miniaturization of the rotating electric machine.

[0086] Furthermore, whether to avoid interference between different slot pitches on the radial outer diameter side of the stator 100 or in the axial direction of the stator 100 should be appropriately selected in accordance with the requirements of the rotating electric machine, taking into consideration the structure of the housing, etc.

[0087] Next, the installation of the wiring member 91 for supplying power to the stator winding 102 of the stator 100 will be explained with reference to Figures 25 and 26. Figure 25 is a perspective view of the winding for one phase, and is an installation diagram showing the case where the wiring member 91 is attached in the axial direction of the stator. In Figure 25, the starting conductor is labeled WSC, the axial direction is labeled RD, and the radial direction is labeled RD. Figure 26 is a perspective view of the winding for one phase, and is an installation diagram showing the case where the wiring member 91 is attached in the radial direction of the stator. In Figure 26, the starting conductor is labeled WSC, the axial direction is labeled RD, and the radial direction is labeled RD. Furthermore, the wiring component 91 is joined by partially peeling off the insulating coating of the U-shaped segment conductor.

[0088] By devising the arrangement of the connecting wires, a feature of Embodiment 6, the number of coil types can be reduced, and since the starting and ending conductors are placed adjacent to each other, wiring work becomes easier. Furthermore, by using U-shaped segment conductors for the starting and ending conductors, the connection work can be simplified, a connection plate is not required, and miniaturization and cost reduction are possible. In addition, since the wiring components can be placed at any location, a layout design that meets requirements can be created.

[0089] As described above, the rotating electric machine of Embodiment 6 reduces the number of welding points for wire crossovers, allows for single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, it allows for a reduction in the number of coil types, simplification of connection work, and layout design tailored to requirements.

[0090] Embodiment 7. The rotating electric machine of Embodiment 7 is configured to have a temperature-sensing element installed on the stator winding.

[0091] The differences between the rotating electric machine of Embodiment 7 and Embodiment 1 will be explained, focusing on the arrangement of temperature-sensing elements with respect to the windings, based on Figures 27, 28, 29, and 30. In the drawings of Embodiment 7, parts that are the same as or corresponding to those in Embodiment 1 are denoted by the same reference numerals.

[0092] Figure 27 is a diagram showing the arrangement of temperature sensing elements 92 placed on the straight sections at the top of the terminals of each phase of the stator winding 102 of the stator 100. Figure 28 is a diagram showing the arrangement of temperature sensing elements 92 on the straight sections of the hypotenuses of the connecting wires of each phase of the stator winding 102 of the stator 100. In Figures 27 and 28, U represents the U-phase winding, V represents the V-phase winding, and W represents the W-phase winding.

[0093] By providing straight sections at the top and slanted edges of the crossovers of each phase of the stator winding 102, without mold forming or twist forming (i.e., unprocessed parts as segment conductors), the installation of the temperature measuring element 92 for measuring the conductor temperature is facilitated, the response time of measurement is improved, and accurate temperature measurement is possible.

[0094] Figure 29 is a diagram showing the arrangement of a temperature measuring element 92 in the straight section between the tops of the terminals of each phase of the stator winding 102 of the stator 100. Figure 30 is a diagram showing the arrangement of the temperature sensing element 92 in the straight section between the hypotenuses of the connecting wires of each phase of the stator winding 102 of the stator 100. In Figures 29 and 30, U represents the U-phase winding, V represents the V-phase winding, and W represents the W-phase winding.

[0095] By placing temperature-sensing 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 just two temperature-sensing elements, thus reducing component costs.

[0096] By adopting the configuration of Embodiment 7, that is, the configuration in which a temperature sensing element is installed on the stator winding, the temperature of the stator winding can be measured with high accuracy, and work efficiency is also improved. Furthermore, if the temperature sensing element is placed between the phases of the stator winding, the number of temperature sensing elements can be reduced, making cost reduction possible.

[0097] As described above, the rotating electric machine of Embodiment 7 reduces the number of welding points for wire crossovers, allows for single-phase connection without using connection plates, and provides a rotating electric machine that achieves miniaturization and cost reduction of the stator. Furthermore, it allows for accurate measurement of the stator winding temperature.

[0098] While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the art disclosed in this specification. These include, for example, modifying, adding or omitting at least one component, or even extracting at least one component and combining it with components of other embodiments. [Explanation of Symbols]

[0099] 100 Stator, 101 Stator core, 102 Stator winding, 1000 Rotating electric machine, 10 Flat segment conductor, 11,21,31,41,51,61,71 Top section, 12,22,32,42,52,62,72 Hypotenuse section, 13,23,33,43,53,63,73 Straight section, 14,24,34,44,54,64,74 Twisted section, 15,25,35,45,46,55,56,65,75 Joint section, 20,30,40,50,60,70 Flat segment conductor, 40a Straight flat segment conductor.

Claims

1. In a rotating electric machine having a stator, which is constructed by mounting stator windings on a stator core, The stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are equipped with conductor wires numbered 1 to n arranged in multiple layers in the radial direction. In each phase of the aforementioned rotating electric machine, a conductor wire structure is formed by connecting multiple conductor wires in series or in parallel. Let q be a natural number greater than or equal to 2. The stator has a number of slots per pole per phase of q, and has multiple groups of identical conductor wires housed in adjacent slots. These multiple identical-phase groups are arranged circumferentially at a slot pitch of the number of phases of the rotating electric machine × q. A rotating electric machine in which, within different groups of the same phase, multiple jumpers are used to connect one line (number 1) of one group to one line (number n) of the other group, and the slot pitch of the multiple jumpers is not constant, with multiple types of jumpers having different slot pitches.

2. The stator windings are arranged in the slots, with adjacent groups of windings 2 to n-1 connecting each other, as described in claim 1.

3. The stator windings are configured such that the connecting wires connect adjacent groups of the stator windings according to claim 1.

4. The rotating electric machine according to claim 1, wherein the connecting wire is a U-shaped segment conductor.

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

6. The rotating electric machine according to any one of claims 1 to 4, wherein the stator winding is a short-segment winding.

7. The rotating electric machine according to any one of claims 1 to 4, wherein the stator winding is a flat rectangular segment conductor.

8. The rotating electric machine according to claim 7, wherein the rectangular segment conductors of the connecting wires are arranged such that the longitudinal direction of the cross-section of the top portion is perpendicular to the axial direction of the rotating electric machine.

9. The rotating electric machine according to claim 7, wherein the flat rectangular segment conductor of the connecting wire is arranged such that the shorter side of the cross-section of the top portion is perpendicular to the axial direction of the rotating electric machine.

10. The rotating electric machine according to claim 1, wherein the conductor wires in the 2nd to n-1th lines arranged in the slot are segment conductors formed from two straight conductors.

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

12. The rotating electric machine according to claim 1, wherein the stator windings have a starting conductor and a ending conductor of the same phase arranged in adjacent groups.

13. The aforementioned connecting wire is a U-shaped segment conductor having a top portion, a hypotenuse portion, a straight portion, a twisted portion, and a joint portion. The rotating electric machine according to claim 1, wherein the slot pitch between the tops is the same, the angle of the hypotenuse portion of the first wire arranged in the slot is the same, the axial height of the tops is the same, and the angle of the hypotenuse portion of the n wire arranged in the slot is different.

14. The aforementioned connecting wire is a U-shaped segment conductor having a top portion, a hypotenuse portion, a straight portion, a twisted portion, and a joint portion. The rotating electric machine according to claim 1, wherein the angles of the hypotenuse portion of the first wire arranged in the slot are the same, the angles of the hypotenuse portion of the n wire arranged in the slot are the same, the axial height of the top is the same, and the slot pitch between the tops is different.

15. The aforementioned connecting wire is a U-shaped segment conductor having a top portion, a hypotenuse portion, a straight portion, a twisted portion, and a joint portion. The rotating electric machine according to claim 1, wherein the angles of the hypotenuse portion of the first wire arranged in the slot are the same, the angles of the hypotenuse portion of the n wire arranged in the slot are the same, the pitch between the tops is the same, and the axial height of the tops is different.

16. The stator windings are connected in series, and in the case of parallel connections satisfying the condition that the number of slots per pole per phase q >= 2N, where N is a natural number, The rotating electric machine according to claim 1, having a connecting conductor that connects the first wire located in the slot of any of the aforementioned groups with the first wires located in adjacent slots of the aforementioned groups, or the nth wire located in the slot of any of the aforementioned groups with the nth wires located in adjacent slots of the aforementioned groups.

17. The stator windings, when connected in parallel, satisfy the condition that the number of slots per pole per phase q < number of parallel connections 2N, where N is a natural number. The rotating electric machine according to claim 1, wherein the first wire and the nth wire, which are arranged in the same group of slots, are used as starting conductors.

18. If the smallest slot number in the aforementioned group is U1 and the largest slot number is Uq, and m is a natural number, The rotating electric machine according to claim 17, wherein the stator winding has a connecting wire that connects the first wire U1 located in the slot of any of the groups to the nth wire Uq located in the adjacent slot of the group, and a connecting wire that connects the first wire Um+1 located in the slot of any of the groups to the nth wire Um located in the adjacent slot of the group.

19. The rotating electric machine according to claim 18, wherein the stator winding has N segmented conductors as the starting conductor, and a wiring member is provided on the connection side where the starting and ending conductors are installed.

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

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

22. The rotating electric machine according to claim 19 or claim 20, wherein the wiring member is provided in the radial direction of the rotating electric machine.

23. The aforementioned connecting wire is a U-shaped segment conductor having a top portion, a hypotenuse portion, a straight portion, a twisted portion, and a joint portion. The rotating electric machine according to claim 1, further comprising a temperature measuring element at the top or slanted edge of the crossover wire.

24. The aforementioned connecting wire is a U-shaped segment conductor having a top portion, a hypotenuse portion, a straight portion, a twisted portion, and a joint portion. The rotating electric machine according to claim 1, further comprising a temperature measuring element that contacts the tops or slanted edges of two or more of the aforementioned connecting wires.

25. In a rotating electric machine having a stator, which is constructed by mounting stator windings on a stator core, The stator core has a plurality of slots arranged in the circumferential direction, where n is an even number of 4 or more, and the slots are equipped with conductor wires numbered 1 to n arranged in multiple layers in the radial direction. In each phase of the aforementioned rotating electric machine, a conductor wire structure is formed by connecting multiple conductor wires in series or in parallel. Let q be a natural number greater than or equal to 2. The stator has a number of slots per pole per phase of q, and has multiple groups of identical conductor wires housed in adjacent slots. These multiple identical-phase groups are arranged circumferentially at a slot pitch of the number of phases of the rotating electric machine × q. A rotating electric machine in which the number of slots per pole per phase q ≥ 3, and in the stator winding formed of segment coils, the connecting wires that connect adjacent groups of the same phase have at least a portion of different slot pitches.

26. If the smallest slot number in the aforementioned group is U1 and the largest slot number is Uq, and m is a natural number, The rotating electric machine according to claim 25, wherein the stator winding has a connecting wire that connects the first wire U1 located in the slot of any of the groups to the nth wire Uq located in the adjacent slot of the group, and a connecting wire that connects the first wire Um+1 located in the slot of any of the groups to the nth wire Um located in the adjacent slot of the group.

27. The rotating electric machine according to claim 25, wherein the crossover connects track 1 of a certain group to an adjacent track n of the group.

28. The rotating electric machine according to claim 25, wherein the connecting wire connects nth track of a certain group to an adjacent nth track of the group.

29. The rotating electric machine according to claim 25, wherein the crossover connects track 1 of one of the aforementioned groups to track 1 of an adjacent group.

30. The rotating electric machine according to claim 25, wherein the aforementioned crossover connects track 1 of one group to track 1 of an adjacent group, and another aforementioned crossover connects track n of one group to track n of an adjacent group.

31. The rotating electric machine according to claim 25, wherein, when m is a natural number, the connecting line connects Uq of track 1 of a certain group to U1 of an adjacent track n of the same group, and another connecting line connects Um of track 1 of a certain group to Um+1 of an adjacent track n of the same group.

32. The rotating electric machine according to claim 26 or claim 31, wherein interference between different slot pitches of the aforementioned wires is avoided on the radial outer diameter side of the stator.

33. The rotating electric machine according to claim 26 or claim 31, which avoids interference between different slot pitches of the aforementioned wires in the axial direction of the stator.

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