Stator of a rotating electric machine

Abstract

Multiple layers of conductor wires (7) are provided in slots (4) from wire 1 to wire T, and multiple groups (8) consisting of multiple layers of conductor wires (7) of the same phase are provided, with the number of slots in one group (8) being q, and one conductor wire (7) of the same phase on the same wire 1 is arranged evenly spaced in the circumferential direction, and the winding (5) is a plurality of unit windings (9) of which are shifted radially with each turn being a raised overlap winding, and q segment coils (12) are provided according to the number of slots q, connecting the conductor wire (7) of wire 2m in one group (8a) and the conductor wire (7) of wire 2m+1 in the other group (8b), and q segment coils (12) are provided according to the number of slots q, and the number of rows M in the unit segment coil group (10) is M = T / 2 - 1, and when (T / 2) / q = n and n ≥ 1, segment coils (12) having two or more types of slot pitches are provided in the M row unit segment coil group (10).

Description

Technical Field

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

Background Art

[0002] A rotating electric machine includes a rotor and a stator having a core and windings. The rotating electric machine operates as a motor that drives an internal combustion engine, and also functions as a generator that is driven by the internal combustion engine to generate electricity. In recent years, particularly for rotating electric machines for electric vehicles, miniaturization and high efficiency have been demanded. In particular, improvement proposals have been made for stators where the effects of miniaturization and high efficiency are significant.

[0003] As one of the improvement proposals, a configuration of a rotating electric machine provided with a stator having an improved winding space factor is known. In this rotating electric machine, a plurality of conductor wires formed in a U shape from a conductor wire having a square cross section are inserted into the slots of the core from the axial direction of the core, the terminal portions of the conductor wires are twisted in the circumferential direction at a predetermined angle, and the terminal portions of the conductor wires are connected to each other, thereby forming a distributed winding stator.

[0004] In a rotating electric machine that minimizes losses and is required to be miniaturized and highly efficient in this way, when the phase windings are connected in parallel, it is known that there is a possibility that an unintended circulating current may occur due to the voltage difference between each parallel branch. When the circulating current occurs, significant adverse effects such as deterioration of losses and deterioration of noise occur. Therefore, it is necessary to devise the arrangement of the windings so that the sum of the voltage vectors due to the linked magnetic flux is substantially uniform in each branch.

[0005] In particular, in the case of distributed windings with two or more rows of slots per pole and per phase, a phase difference in the electromotive force occurs depending on which slot of the multiple rows within a single phase and single pole is connected. Therefore, care must be taken to balance the sum of the voltages between each branch by winding the turns so that the number of turns in each row is uniformly distributed within the parallel branch. A configuration that takes into consideration the even connection between each parallel branch has been disclosed (see, for example, Patent Document 1). In the disclosed stator configuration of a rotating electric machine, in order to evenly connect each parallel branch (U1 to U4), multiple types of connecting wires are employed, connecting the inner and outer diameter wire coils on one side in the axial direction of the connecting coil end. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] International Publication No. 2024 / 224821 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the above-mentioned Patent Document 1, consideration is given to evenly connecting each parallel branch, so it is possible to counteract circulating current. However, since the connecting wires for each phase are arranged on one side in the axial direction of the coil end, there are problems with the stator becoming larger and the cost increasing due to the increase in the variety of wiring.

[0008] Therefore, this disclosure aims to provide a stator for a rotating electric machine that is miniaturized and has a lower cost. This disclosure can be applied not only to electric vehicles but also to rotating electric machines for other applications. [Means for solving the problem]

[0009] The stator of the rotating electric machine of the present disclosure comprises an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core and having a plurality of layers of conductor wires arranged in each of the plurality of slots, wherein the plurality of layers of conductor wires are arranged in a radial line inside each of the plurality of slots, from wire 1 to wire T (T is the number of conductor wires inside the slot, an even number of 4 or more), each of the plurality of layers of conductor wires provided in one slot is connected in series or in parallel with the conductor wires provided in other slots, forming a plurality of phase windings having a plurality of winding portions of the same phase, a plurality of groups of plurality of plurality of conductor wires of the same phase are provided arranged in each of the plurality of slots adjacent in the circumferential direction, the number of slots provided in one group is q (q is a natural number of 2 or more), other groups adjacent to one group are groups of other phases, and one of the same phase conductor wires of wire 1 is evenly spaced in the circumferential direction, Arranged in each slot, for each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inner and outer side to the other. On one axial side of the core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m gauge (m is a natural number) of one group and the conductor wire of the 2m+1 gauge of the other group. These q segment coils constitute a unit segment coil group, the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch, the number of rows M of the unit segment coil group is M = T / 2 - 1, (T / 2) / q = n (n is a natural number), and when n ≥ 1, the M rows of the unit segment coil group are provided with segment coils having two or more different slot pitches. [Effects of the Invention]

[0010] According to the stator of the rotating electric machine of this disclosure, when the number of rows M of the unit segment coil group is M = T / 2 - 1, (T / 2) / q = n (where n is a natural number), and n ≥ 1, a segment coil having two or more types of slot pitches is provided in the M rows of unit segment coil group. Therefore, each conductor wire provided in each slot can be wound evenly in the connection path of each conductor wire, and measures against circulating current are taken by repeating a simple pattern. This eliminates the need for connection configurations using irregularly shaped wires or connection plates, the shape of the winding is not complicated, the connection path of each conductor wire is simplified, and the coil end can be made low-profile. As the connection path of each conductor wire is simplified and the coil end is made low-profile, a stator for a rotating electric machine that is smaller and lower in cost can be obtained. [Brief explanation of the drawing]

[0011] [Figure 1] This is a cross-sectional view parallel to the axial direction, illustrating the general shape of a rotating electric machine. [Figure 2] This is a side view showing the stator of a rotating electric machine according to Embodiment 1. [Figure 3] This is a plan view showing the U-shaped conductor wire of the stator of a rotating electric machine according to Embodiment 1. [Figure 4] This diagram illustrates the arrangement of windings in the stator of a rotating electric machine according to Embodiment 1. [Figure 5] This diagram shows the wiring sequence in the winding portion of the stator of a rotating electric machine according to Embodiment 1. [Figure 6] This diagram shows the wiring sequence in the winding portion of the stator of another rotating electric machine according to Embodiment 1. [Figure 7] This diagram shows the wiring sequence for half of one phase of the stator winding of a rotating electric machine according to Embodiment 2. [Figure 8] This diagram shows the wiring sequence for half of one phase of the stator winding of another rotating electric machine according to Embodiment 2. [Figure 9] This diagram shows the wiring sequence for half of one phase of the stator winding of another rotating electric machine according to Embodiment 2. [Figure 10] It is a diagram showing the connection order in half of one phase of the winding of the stator of another rotating electrical machine according to Embodiment 2. [Figure 11] It is a diagram showing the connection order in half of one phase of the winding of the stator of a rotating electrical machine according to Embodiment 3. [Figure 12] It is a diagram showing the connection of a unit segment coil group without transition. [Figure 13] It is a top view of a unit segment coil group without transition. [Figure 14] It is a front view of a unit segment coil group without transition. [Figure 15] It is a diagram showing the connection of a unit segment coil group with transition. [Figure 16] It is a top view of a unit segment coil group with transition. [Figure 17] It is a front view of a unit segment coil group with transition. [Figure 18] It is a diagram showing the connection of another unit segment coil group with transition. [Figure 19] It is a top view of another unit segment coil group with transition. [Figure 20] It is a front view of another unit segment coil group with transition. [Figure 21] It is a diagram showing the connection order of one phase of the winding of the stator of a rotating electrical machine according to Embodiment 4. [Figure 22] It is a diagram showing the connection order of one phase of the winding of the stator of another rotating electrical machine according to Embodiment 4. [Figure 23] It is a diagram showing the connection of a unit crossover group without transition. [Figure 24] It is a top view of a unit crossover group without transition. [Figure 25] It is a front view of a unit crossover group without transition. [Figure 26] It is a diagram showing the connection of a unit crossover group with transition. [Figure 27] [[ID=5X]]It is a top view of a unit crossover group with transition. [Figure 28] It is a front view of a unit crossover group with transition. It seems there is a small error in the original text where "[[ID=5X]]" should probably be "" in the translation above. I've translated it as best as possible based on the provided rules. [Figure 29] This figure shows the connections of another unit transit group with a transition. [Figure 30] This is a top view of another unit transit group with a transition. [Figure 31] This is a front view of another unit transit group with a transition. [Modes for carrying out the invention]

[0012] The stator of a rotating electric machine according to the embodiment of this disclosure will be described below with reference to the figures. In each figure, the same or equivalent members and parts will be denoted by the same reference numerals.

[0013] Embodiment 1. Figure 1 is a cross-sectional view parallel to the axial direction showing a schematic of the rotating electric machine 100, Figure 2 is a side view showing the stator 1 of the rotating electric machine 100 according to Embodiment 1, Figure 3 is a plan view showing the U-shaped conductor wire 6 of the stator 1 of the rotating electric machine 100, Figure 4 is a diagram illustrating the arrangement of the windings 5 ​​of the stator 1 of the rotating electric machine 100, Figure 5 is a diagram showing the wiring configuration in a portion of the windings 5 ​​of the stator 1 of the rotating electric machine 100, showing the wiring order of a unit winding 9 with the wiring for one phase partially removed, and Figure 6 is a diagram showing the wiring configuration in a portion of the windings 5 ​​of the stator 1 of another rotating electric machine 100 according to Embodiment 1, showing the wiring order of a unit winding 9 with the wiring for one phase partially removed. The rotating electric machine 100 comprises a stator 1 and a rotor 2 and operates as an electric motor. Alternatively, the rotating electric machine 100 functions as a generator that generates electricity when driven externally. Hereinafter, the circumferential direction of the core 3 of the stator 1 will be referred to as the circumferential direction, the axial direction of the core 3 as the axial direction, and the radial direction of the core 3 as the radial direction. In the diagram, the axial direction is indicated by arrow X, and the radial direction is indicated by arrow Y. Furthermore, the direction on one side of the axial direction will be denoted as X1, the direction on the other side of the axial direction as X2, the radially outward direction as Y1, and the radially inward direction as Y2.

[0014] <Rotating Electric Machine 100> As shown in Figure 1, the rotating electric machine 100 comprises a rotor 2 having a rotating shaft 2a and rotating integrally with the rotating shaft 2a, an iron core 3 facing the rotor 2 and spaced radially apart, and a stator 1 mounted on the iron core 3 and having windings 5 ​​forming multiple phases. In this embodiment, there are three phases. The iron core 3 has multiple slots 4 arranged in the circumferential direction. The multi-phase windings 5 ​​are wound around the iron core 3 and have multiple layers of conductor wires 7 arranged in each of the multiple slots 4. The multiple layers of conductor wires 7 will be described later.

[0015] The rotor 2 is rotatably supported in a housing, for example, via bearings (not shown), with its outer surface facing the inner surface of the stator 1. The rotor 2 comprises a rotor core 2b, a rotating shaft 2a inserted through the axial position of the rotor core 2b, and permanent magnets (not shown) that constitute the magnetic poles. The permanent magnets are embedded on the outer surface side of the rotor core 2b and arranged at a predetermined pitch in the circumferential direction. In this embodiment, the rotor 2 is a permanent magnet type rotor. The rotor 2 is not limited to a permanent magnet type rotor, and may also be configured with field windings wound around the rotor core 2b. The rotating electric machine 100 is composed of 6 poles and 54 slots. The configuration of the rotating electric machine 100 is not limited to this, and the number of poles of the rotor 2 may be, for example, 4 poles.

[0016] <Status 1> The stator 1 comprises a cylindrical iron core 3 and windings 5 ​​wound around the iron core 3. The iron core 3 has an annular yoke 3a, a plurality of teeth 3b that protrude radially inward from the inner circumferential surface of the yoke 3a and are spaced apart in the circumferential direction, and slots 4 formed between each of the teeth 3b. In this embodiment, as shown in Figure 2, the iron core 3 is formed from a plurality of steel plates stacked in the axial direction. The steel plates forming the iron core 3 are, for example, non-oriented electrical steel sheets.

[0017] In this embodiment, the winding 5, which forms multiple phases, is a three-phase distributed winding configuration using multiple U-shaped conductor wires 6. As shown in Figure 3, the U-shaped conductor wire 6 is a conductor formed in a U shape. The U-shaped conductor wire 6 is made of, for example, copper. The U-shaped conductor wire 6 has a main body portion 6a covered with an insulating coating 6a1 and two exposed conductor ends 6b where the conductor is exposed. Each of the mutually opposing portions of the main body portion 6a of the U-shaped conductor wire 6 is inserted axially into the inside of different slots 4. The portion of the main body portion 6a of the U-shaped conductor wire 6 arranged inside the slots 4 is the conductor wire 7. The cross-section of the U-shaped conductor wire 6 is rectangular. By making the cross-section of the U-shaped conductor wire 6 rectangular, the space factor of the winding 5 can be improved.

[0018] As shown in Figure 4, for example, six conductor wires 7 are arranged in one slot 4. The number of conductor wires 7 arranged in one slot 4 is not limited to this. As shown in Figure 2, the bottom of the U-shaped conductor wire 6 is positioned on the other side in the axial direction of the iron core 3, becoming the non-connecting side (AWS). The exposed conductor end 6b and a part of the main body 6a protrude from one side in the axial direction of the iron core 3. The connected side (WDS) of the stator 1 is formed by connecting the exposed conductor end 6b and the segment coil, which will be described later, for example by welding. Each of the multiple U-shaped conductor wires 6 is electrically connected to form a winding 5. The connection configuration of the U-shaped conductor wires 6 is not limited to this. The protruding exposed conductor end 6b and a part of the main body 6a may be bent at a predetermined angle in the direction of one or the other side in the circumferential direction, and the exposed conductor end 6b of one U-shaped conductor wire 6 and the exposed conductor end 6b of the other U-shaped conductor wire 6 may be connected, for example by welding. In this case, a segment coil is formed on the connection side of the stator 1 by connecting the exposed end 6b of the conductor.

[0019] <Connection configuration of conductor wire 7> The connection configuration of the conductor wires 7, which is the main part of this disclosure, will be explained using Figures 4 and 5. First, the basic configuration of the arrangement of the conductor wires 7 will be explained using Figure 4. Figures 4 and 5 are views from one side in the axial direction, with some of the slots 4 arranged in the circumferential direction of the iron core 3, with the teeth 3b omitted and arranged horizontally in the figure. Hereafter, all figures explaining the connection configuration of the conductor wires 7 will be shown in this manner. In this embodiment, the winding 5 has three phases: U phase, V phase, and W phase. Each phase has three windings connected in parallel. The conductor wires 7 that constitute each of the three U phase windings are labeled U1, U2, and U3 in the figures.

[0020] The multiple layers of conductor wires 7 are arranged in a radial line inside each of the multiple slots 4, from wire 1 to wire T (T is the number of conductor wires 7 inside the slot 4, an even number of 4 or more; hereafter, T will be referred to as the number of conductors inside the slot). In Figure 4, the number of conductors inside the slot T is 6. The number of conductors inside the slot T is not limited to 6. The number of wire grades of the conductor wires 7 is shown on the left side of the figure. Wire 1 is provided on the radially inner side, and wire 6 is provided on the radially outer side. Alternatively, wire 1 may be provided on the radially outer side, and wire 6 may be provided on the radially inner side. Each of the multiple layers of conductor wires 7 provided in one slot 4 is connected in series or parallel with conductor wires 7 provided in other slots 4, forming a multi-phase winding 5 having multiple winding sections of the same phase. In this embodiment, a three-phase winding 5 is formed, having three winding sections of three of the same phase. The number of windings of the same phase connected in parallel is not limited to three.

[0021] Multiple groups 8 are provided, each consisting of multiple layers of conductor wires 7 of the same phase, arranged in multiple circumferentially adjacent slots 4. The number of slots 4 in one group 8 is denoted as q (where q is a natural number greater than or equal to 2; hereafter, q will be referred to as the number of slots per pole per phase). Other groups adjacent to one group 8 are groups of other phases. In Figure 4, the number of slots per pole per phase q is 3. However, the number of slots per pole per phase q is not limited to 3. In Figure 4, one group 8 is the area enclosed by the dashed line. For example, a V-phase group is provided to the right of a U-phase group 8, and a W-phase group is provided to the left of a U-phase group 8.

[0022] Each conductor wire 7 of the same phase in the same terminal is arranged in each of the slots 4 at equal intervals in the circumferential direction, with a slot pitch equal to the number of phases multiplied by q. In Figure 4, since there are 3 phases and the number of slots per pole per phase is 3, the conductor wires 7 of U1 are arranged with a 9-slot pitch. The same applies to the other conductor wires 7 of the same phase in the same terminal.

[0023] Next, the connection configuration of the conductor wires 7 of the unit winding 9 will be explained using Figure 5. The solid lines indicate connections on the other axial side of the conductor wire 7, while the dashed or double-dotted lines indicate connections on the connected side of the axial direction. The dashed or double-dotted lines indicate connections using segment coils. For each phase winding 5, in each set of multiple adjacent groups 8 of the same phase, multiple unit windings 9 are provided, each spanning adjacent groups 8, consisting of overlapping windings that shift radially by one turn each time from one radially inner and outer side to the other. In Figure 5, one group is designated as group 8a and the other as group 8b, and three unit windings 9 are formed by connecting both groups. Thus, Figure 5 shows unit windings 9 with two groups 8 connected alternately, but the configuration of the unit windings 9 is not limited to this. It is also possible to use three or more groups 8 and configure unit windings 9 with three or more groups 8 connected alternately.

[0024] On one axial side of the iron core 3, q ​​segment coils are provided, corresponding to the number of slots q per pole and per phase. These q segment coils connect the conductor wire 7 of the 2m gauge (m is a natural number) of one group 8a to the conductor wire 7 of the 2m+1 gauge of the other group 8b. These q segment coils are designated as a unit segment coil group 10. The number of slots from one slot on the circumferential side to the other slot on the circumferential side where the segment coils are provided is the slot pitch (k is a natural number). In Figure 5, the number of slots q per pole and per phase is 3, and 3 segment coils constitute the unit segment coil group 10. The number of rows M in the unit segment coil group 10 is M = T / 2 - 1. In Figure 5, the number of rows M in the unit segment coil group 10 is 2. The segment coils are formed by connecting the two exposed conductor ends 6b. The starting points of the three unit windings 9 are designated as WSC1, WSC2, and WSC3, and the ending points are designated as WEC1, WEC2, and WEC3.

[0025] When (T / 2) / q = n (where n is a natural number) and n ≥ 1, the M-row unit segment coil group 10 is provided with segment coils having two or more different slot pitches. In Figure 5, since n is 1 and M is 2, each of the two rows of unit segment coil groups 10 is provided with segment coils having two different slot pitches. Each unit segment coil group 10 is provided with one segment coil with an 11-slot pitch and two segment coils with an 8-slot pitch. The 11-slot pitch segment coil is shown with a dashed line, and the 8-slot pitch segment coil is shown with a double-dashed line. The types of segment coils are not limited to two. Hereinafter, providing segment coils with different slot pitches in the unit segment coil group 10 will be referred to as a transition.

[0026] Due to the transition, the connection path for each conductor wire 7 in the unit winding 9 from WSC1 to WEC1 is U1→U1→U2→U2→U3→U3. Due to the transition, the connection path for each conductor wire 7 in the unit winding 9 from WSC2 to WEC2 is U2→U2→U3→U3→U1→U1. Due to the transition, the connection path for each conductor wire 7 in the unit winding 9 from WSC3 to WEC3 is U3→U3→U1→U1→U2→U2. In this way, in the connection path for each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so measures against circulating current are taken by repeating a simple pattern, eliminating the need for transitions using shaped wires or connection plates, keeping the shape of the winding 5 from becoming complicated, simplifying the connection path for each conductor wire 7, and allowing for a lower profile coil end. Since the connection paths of each conductor wire 7 are simplified and the coil ends are made lower in height, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0027] Figure 6 will be used to explain a connection configuration for the conductor wire 7 that is different from the connection configuration for the conductor wire 7 shown in Figure 5. The explanation for a configuration similar to the one shown in Figure 5 will be omitted. In Figure 6, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has two windings connected in parallel. The conductor wires 7 constituting each of the two U-phase windings are labeled U1 and U2 in the figure.

[0028] In Figure 6, the number of conductors T in a slot is 8, and the number of slots q per pole per phase is 2. In Figure 6, a three-phase winding 5 is formed, having three windings of two identical phases. In Figure 6, since there are 3 phases and the number of slots q per pole per phase is 2, one identical phase conductor wire 7 of the same line is arranged at a 6-slot pitch. In Figure 6, two unit windings 9 are formed by connecting two adjacent groups. Since the number of slots q per pole per phase is 2, a unit segment coil group 10 consisting of two segment coils is formed. In Figure 6, the number of rows M in the unit segment coil group 10 is 3. The starting points of the two unit windings 9 are designated as WSC1 and WSC2, and the ending points are designated as WEC1 and WEC2.

[0029] When (T / 2) / q=n (where n is a natural number) and n≧2, the unit segment coil group 10 in column (q-1) is provided with segment coils having two or more different slot pitches. In Figure 6, since n is 2 and q-1 is 1, the unit segment coil group 10 in column 1 is provided with segment coils having two different slot pitches. The unit segment coil group 10 with transitions has one segment coil with a 7-slot pitch and one segment coil with a 5-slot pitch. In Figure 6, the segment coil with a 7-slot pitch is shown by a dashed line, and the segment coil with a 5-slot pitch is shown by a single dashed line. The segment coils in the unit segment coil group 10 without transitions are shown by single dashed lines different from the single dashed line showing the segment coil with a 5-slot pitch.

[0030] Figure 6 shows a partially extracted diagram of the wiring for one phase, where a transition is provided in the central unit segment coil group 10, labeled 10, within the three rows of unit segment coil groups 10. In the unit winding 9 that is not extracted, a transition is also provided in the central unit segment coil group 10 within the three rows of unit segment coil groups 10. The unit segment coil group 10 on which the transition is provided is not limited to the center. It does not have to be the center, as long as the position of the unit segment coil group 10 on which the transition is provided is the same in all unit windings 9.

[0031] Due to the transition, the connection path for each conductor wire 7 in the unit winding 9 from WSC1 to WEC1 is U1→U1→U1→U1→U2→U2→U2→U2. Due to the transition, the connection path for each conductor wire 7 in the unit winding 9 from WSC2 to WEC2 is U2→U2→U2→U2→U1→U1→U1→U1. In this way, U1 and U2 provided in each slot 4 can be wound evenly in the connection path of each conductor wire 7, so measures against circulating current are taken by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, the shape of the winding 5 is not complicated, the connection path for each conductor wire 7 is simplified, and the coil end can be made lower in height. As the connection path for each conductor wire 7 is simplified and the coil end is made lower in height, a stator 1 of the rotating electric machine 100 can be obtained that is smaller and lower in height.

[0032] As described above, in the stator 1 of the rotating electric machine 100 according to Embodiment 1, the number of rows M of the unit segment coil group 10 is M = T / 2 - 1, (T / 2) / q = n (where n is a natural number), and when n ≥ 1, the unit segment coil group 10 of M rows is provided with segment coils having two or more different slot pitches. Therefore, in the connection path of each conductor wire 7, each conductor wire 7 provided in each slot 4 can be wound evenly, so that measures against circulating current are taken by repeating a simple pattern, eliminating the need for transfers using irregularly shaped wires or connection plates, the shape of the winding 5 is not complicated, the connection path of each conductor wire 7 is simplified, and the coil end can be made low-profile. As the connection path of each conductor wire 7 is simplified and the coil end is made low-profile, a smaller and lower-cost stator 1 of the rotating electric machine 100 can be obtained.

[0033] When (T / 2) / q=n (where n is a natural number) and n≧2, if a group of unit segment coils 10 in column (q-1) has two or more different slot pitches, then in the connection path of each conductor wire 7, each conductor wire 7 provided in each slot 4 can be wound evenly. As a result, circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates. This prevents the shape of the winding 5 from becoming complicated, simplifies the connection path of each conductor wire 7, and allows for a lower profile coil end. Because the connection path of each conductor wire 7 is simplified and the coil end is lower profile, a smaller and lower-cost stator 1 for a rotating electric machine 100 can be obtained.

[0034] Embodiment 2. The stator 1 of the rotating electric machine 100 according to Embodiment 2 will now be described. Figure 7 shows the wiring order for half of the wiring of one phase of the winding 5 of the stator 1 of the rotating electric machine 100 according to Embodiment 2, Figure 8 shows the wiring order for half of the wiring of one phase of the winding 5 of the stator 1 of another rotating electric machine 100, Figure 9 shows the wiring order for half of the wiring of one phase of the winding 5 of yet another rotating electric machine 100, and Figure 10 shows the wiring order for half of the wiring of one phase of the winding 5 of yet another rotating electric machine 100. The stator 1 of the rotating electric machine 100 according to Embodiment 2 has a different configuration from Embodiment 1 in the location where the transition is provided. The configuration that is equivalent to the configuration shown in Embodiment 1 will not be described.

[0035] First, let's explain the connection configuration of the conductor wires 7 shown in Figure 7. In Figure 7, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0036] In Figure 7, the number of conductors T in a slot is 8, and the number of slots q per pole per phase is 3. In Figure 7, since there are 3 phases and 3 slots q per pole per phase, one conductor wire 7 of the same phase on each wire is arranged at a 9-slot pitch. In Figure 7, three unit windings 9 are formed at three locations by connecting two adjacent groups. Since there are 3 slots q per pole per phase, a unit segment coil group 10 consisting of 3 segment coils is formed. In Figure 7, the number of rows M in the unit segment coil group 10 is 3. The starting points of the three unit windings 9 at the three locations are designated as WSC1, WSC2, and WSC3, and the ending points are designated as WEC1, WEC2, and WSC3.

[0037] A number of jumpers is provided, corresponding to the number of slots q per pole and per phase, connecting the conductor wire 7 of line 1 in one unit winding 9 with the conductor wire 7 of line T in another unit winding 9 of the same phase that is circumferentially adjacent to the conductor wire 7 of line 1. These q jumpers are called a unit jumper group 11, and the number of pole pairs is p. The number of slots from one slot on the circumferential side to the other slot on the circumferential side where the jumper is provided is the slot pitch (a is a natural number). In Figure 7, since the number of conductors T in a slot is 8, the jumper connects the conductor wire 7 of line 1 and the conductor wire 7 of line 8. In Figure 7, since the number of slots q per pole and per phase is 3, 3 jumpers are provided, and these 3 jumpers constitute a unit jumper group 11. The number of pole pairs p is 3.

[0038] When (T / 2) × p / q = r (where r is a natural number) and p / q = s (where s is a natural number), the unit relay group 11 is provided with relays having two or more different slot pitches. In Figure 7, since r is 4 and s is 1, the unit relay group 11 is provided with segment coils having two different slot pitches. The unit relay group 11 is provided with one relay with an 11-slot pitch and two relays with an 8-slot pitch. The relay with an 11-slot pitch is shown with a dashed line, and the relays with an 8-slot pitch are shown with a double-dashed line. The types of relays are not limited to two.

[0039] Due to the transition, the connection path of each conductor line 7 from WSC1 to WEC1 is U1→U1→U1→U1→U1→U1→U1→U2→U2→U2→U2→U2→U2→U2→U2→U3→U3→U3→U3→U3→U3→U3→U3. Due to the transition, the connection path of each conductor line 7 from WSC2 to WEC2 is U2→U2→U2→U2→U2→U2→U2→U1→U1→U1→U1→U1→U1→U1→U3→U3→U3→U3→U3→U3→U3. Due to the transition, the connection path of each conductor line 7 from WSC3 to WEC3 is U3→U3→U3→U3→U3→U3→U3→U3→U2→U2→U2→U2→U2→U2→U2→U2→U1→U1→U1→U1→U1→U1→U1→U1.

[0040] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0041] Next, the connection configuration of the conductor wires 7 shown in Figure 8 will be explained. In Figure 8, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0042] In Figure 8, the number of conductors in a slot T is 8, the number of slots per pole per phase q is 3, and the number of pole pairs p is 3. In Figure 8, since there are 3 phases and 3 slots per pole per phase q, one conductor wire 7 of the same phase on each wire is arranged at a 9-slot pitch. In Figure 8, three unit windings 9 are formed at three locations by connecting two adjacent groups. Since there are 3 slots per pole per phase q, a unit segment coil group 10 consisting of three segment coils is formed. In Figure 8, the number of rows M of the unit segment coil group 10 is 3. The starting points of the three unit windings 9 at the three locations are designated as WSC1, WSC2, and WSC3, and the ending points are designated as WEC1, WEC2, and WSC3.

[0043] In Figure 8, since the number of conductors T in a slot is 8, a jumper wire connects conductor wire 7 of track 1 and conductor wire 7 of track 8. In Figure 8, since the number of slots q per pole per phase is 3, three jumper wires are provided, and these three jumper wires form a unit jumper wire group 11.

[0044] When (T / 2) × p / q = r (where r is a natural number) and p / q = s (where s is a natural number), a row of unit segment coils 10 in a unit winding 9 is provided with segment coils having two or more different slot pitches. In Figure 8, since r is 4 and s is 1, a row of unit segment coils 10 in each unit winding 9 is provided with segment coils having two or more different slot pitches. The unit segment coil group 10 is provided with one segment coil with an 11-slot pitch and two segment coils with an 8-slot pitch. The 11-slot pitch connections are shown with dashed lines, and the 8-slot pitch connections are shown with double-dash lines.

[0045] In Figure 8, a transition is provided in the central unit segment coil group 10, labeled 10, within the three rows of unit segment coil groups 10 in each unit winding 9. The unit segment coil group 10 on which the transition is provided is not limited to the center. It does not have to be the center, as long as the position of the unit segment coil group 10 on which the transition is provided is the same in all unit windings 9.

[0046] Due to the transition, the connection path for each conductor wire 7 from WSC1 to WEC1 is U1 (4) → U2 (8) → U3 (8) → U1 (4). Due to the transition, the connection path for each conductor wire 7 from WSC2 to WEC2 is U2 (4) → U3 (8) → U1 (8) → U2 (4). Due to the transition, the connection path for each conductor wire 7 from WSC3 to WEC3 is U3 (4) → U1 (8) → U2 (8) → U3 (4).

[0047] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0048] Next, the connection configuration of the conductor wires 7 shown in Figure 9 will be explained. In Figure 9, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0049] The connection configuration of the conductor wires 7 shown in Figure 9 is a modified version of the connection configuration of the conductor wires 7 shown in Figure 8. In Figure 8, one group 8 was provided in three adjacent slots 4, which had the same number of slots q per pole per phase. In the configuration shown in Figure 9, the slots 4 to which the same group 8 conductor wires 7 are provided differ for each wire.

[0050] In the unit winding 9, each of the multiple unit segment coil groups 10 is provided with two or more different slot pitches, and in the unit segment coil group 10 provided with a slot pitch smaller than the largest slot pitch, segment coils with two or more different slot pitches are provided. In Figure 9, there are unit segment coil groups 10 with 8 slot pitches and unit segment coil groups 10 with 7 slot pitches, so a transition is provided in the unit segment coil group 10 with 7 slot pitches.

[0051] When a transition is introduced, a slot pitch larger than the normal k-slot pitch will appear, resulting in a higher axial height of the coil end at the larger slot pitch. By placing the transition point where the slot pitch is not at its maximum, the coil end can be made lower. As the coil end is made lower, a smaller stator 1 for the rotating electric machine 100 can be obtained.

[0052] In the configuration shown in Figure 9, wires 2-3 have an 8-slot pitch, wires 4-5 have a 7-slot pitch, and wires 6-7 have a 7-slot pitch. In this case, by providing a transition in the unit segment coil group 10 of wires 4-5 or 6-7, the unit segment coil group 10 with an 8-slot pitch of wires 2-3 and the unit segment coil group 10 with the transition will have the same coil end height.

[0053] Next, the connection configuration of the conductor wires 7 shown in Figure 10 will be explained. In Figure 10, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0054] In Figure 10, the number of conductors in a slot T is 6, the number of slots per pole per phase q is 3, and the number of pole pairs p is 2. In Figure 10, there are 3 phases and 3 slots per pole per phase, so one conductor wire 7 of the same phase on each line is arranged at a 9-slot pitch. In Figure 10, three unit windings 9 are formed in two locations by connecting two adjacent groups. Since there are 3 slots per pole per phase q, a unit segment coil group 10 consisting of 3 segment coils is formed. In Figure 10, the number of rows M of the unit segment coil group 10 is 2. The starting points of the three unit windings 9 in the two locations are WSC1, WSC2, and WSC3, and the ending points are WEC1, WEC2, and WSC3.

[0055] In Figure 10, since the number of conductors T in a slot is 6, a jumper wire connects conductor wire 7 of track 1 and conductor wire 7 of track 6. In Figure 10, since the number of slots q per pole per phase is 3, three jumper wires are provided, and these three jumper wires form a unit jumper wire group 11.

[0056] When (T / 2) × p / q = r (where r is a natural number) and p / q ≠ s (where s is a natural number), the unit segment coil groups 10 provided on multiple unit windings 9 are provided with segment coils having two or more different slot pitches in (q-1) rows of unit segment coil groups 10, which are arranged to be evenly spaced between the beginning and end of the multiple unit windings 9. In Figure 10, since r is 2 and s is 0.667, each row of unit segment coil groups 10 on each unit winding 9 is provided with segment coils having two or more different slot pitches. The positions of the unit segment coil groups 10 with transitions are the unit segment coil groups 10 provided on the left side of wires 2-3, labeled with reference numeral 10, and the unit segment coil groups 10 provided on the right side of wires 4-5, also labeled with reference numeral 10. The positions of the unit segment coil groups 10 with transitions are arranged to be evenly spaced between the beginning and end of the two unit windings 9. The unit segment coil group 10 is provided with one segment coil with an 11-slot pitch and two segment coils with an 8-slot pitch. The segment coil with an 11-slot pitch is shown with a dashed line, and the segment coils with an 8-slot pitch are shown with a double-dashed line.

[0057] Due to the transition, the connection path for each conductor wire 7 from WSC1 to WEC1 is U1 (4) → U2 (4) → U3 (4). Due to the transition, the connection path for each conductor wire 7 from WSC2 to WEC2 is U2 (4) → U3 (4) → U1 (4). Due to the transition, the connection path for each conductor wire 7 from WSC3 to WEC3 is U3 (4) → U1 (4) → U2 (4).

[0058] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0059] Embodiment 3. The stator 1 of the rotating electric machine 100 according to Embodiment 3 will be described. Figure 11 shows the wiring order for half of the wiring of one phase of the winding of the stator 1 of the rotating electric machine 100 according to Embodiment 3, Figure 12 shows an excerpt of the wiring of a unit segment coil group 10 without transitions, Figure 13 is a top view of the unit segment coil group 10 without transitions, Figure 14 is a front view of the unit segment coil group 10 without transitions, Figure 15 shows an excerpt of the wiring of a unit segment coil group 10 with transitions, Figure 16 is a top view of the unit segment coil group 10 with transitions, Figure 17 is a front view of the unit segment coil group 10 with transitions, Figure 18 shows an excerpt of the wiring of another unit segment coil group 10 with transitions, Figure 19 is a top view of another unit segment coil group 10 with transitions, and Figure 20 is a front view of another unit segment coil group 10 with transitions. The stator 1 of the rotating electric machine 100 according to Embodiment 3 has a different configuration from other embodiments in the location where the transitions are provided. The explanation of configurations equivalent to those shown in Embodiments 1 and 2 will be omitted.

[0060] The connection configuration of the conductor wires 7 shown in Figure 11 will now be explained. In Figure 11, the winding 5 has three phases: U-phase, V-phase, and W-phase. The conductor wires 7 that make up each of the U-phase windings are labeled U1, U2, and U3 in the figure.

[0061] In Figure 11, the number of conductors in a slot T is 8, the number of slots per pole per phase q is 3, and the number of pole pairs p is 3. In Figure 11, there are 3 phases and 3 slots per pole per phase, so one conductor wire 7 of the same phase on each line is arranged at a 9-slot pitch. In Figure 11, three unit windings 9 are formed at three locations by connecting two adjacent groups. Since there are 3 slots per pole per phase q, a unit segment coil group 10 consisting of three segment coils is formed. In Figure 11, the number of rows M of the unit segment coil group 10 is 3. The starting point of the three unit windings 9 at the three locations is designated as WSC1, and the ending point is designated as WEC1. The three unit windings 9 are connected in series to form a U phase.

[0062] In Figure 11, since the number of conductors T in a slot is 8, a jumper wire connects conductor wire 7 of track 1 and conductor wire 7 of track 8. In Figure 11, since the number of slots q per pole per phase is 3, three jumper wires are provided, and these three jumper wires form a unit jumper wire group 11.

[0063] In q identical phase windings 5 ​​adjacent to each other in the circumferential direction, a row of unit segment coils 10 is provided with segment coils having two or more different slot pitches. The unit segment coil group 10 with the transition is located on wires 4-5 of the right-hand unit winding 9, which is labeled with reference numeral 10. The unit segment coil group 10 includes one segment coil with an 11-slot pitch and two segment coils with an 8-slot pitch. The 11-slot pitch segment coil is shown with a dashed line, and the 8-slot pitch segment coil is shown with a double dashed line. Due to the transition, the connection path of each conductor wire 7 from WSC1 to WEC1 is U1 (12 wires) → U2 (24 wires) → U3 (24 wires) → U1 (12 wires).

[0064] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0065] The shape of the segment coil will be explained. First, a unit segment coil group 10 without transitions will be explained using Figures 12 to 14. In Figure 12, the number of phases is 3, and the number of slots q per pole per phase is 3, so k is 9. Since the number of slots q per pole per phase is 3, a unit segment coil group 10 consisting of 3 segment coils 12 is formed. Because there are no transitions, the 3 segment coils 12 have the same shape, as shown in Figures 13 and 14.

[0066] Next, the unit segment coil group 10 with transitions will be explained using Figures 15 to 17. In Figure 15, there are 3 phases and 3 slots per pole per phase, so one identical phase conductor wire 7 of the same line is arranged at a 9-slot pitch. Because there are 3 slots per pole per phase, a unit segment coil group 10 consisting of 3 segment coils 12a and 12b is formed.

[0067] When q≧3, a unit segment coil group 10, which is provided with segment coils 12 having two or more different slot pitches, has one segment coil with a slot pitch of k+(q-1) and q-1 segment coils with a slot pitch of k-1. In Figure 15, since k+(q-1)=11, there is one segment coil 12a with a slot pitch of 11, and since k-1=8, there are two segment coils 12b with a slot pitch of 8. The segment coil 12a with a slot pitch of 11 is shown by a dashed line, and the segment coil 12b with a slot pitch of 8 is shown by a double dashed line.

[0068] Even with the addition of a group of unit segment coils 10 with transitions, the number of segment coil types 12 can be reduced to two, thereby decreasing setup and management costs during manufacturing and lowering the manufacturing cost of the stator 1. Furthermore, the productivity of the stator 1 can be improved. Additionally, as shown in Figures 16 and 17, by placing the segment coil 12b with a smaller slot pitch inside the segment coil 12a with a larger slot pitch, the coil ends can be made lower, resulting in a smaller stator 1 for the rotating electric machine 100.

[0069] Next, another unit segment coil group 10 with transitions will be explained using Figures 18 to 20. In Figure 18, there are 3 phases and 3 slots per pole per phase, so one identical phase conductor wire 7 of the same line is arranged at a 9-slot pitch. Because 3 slots per pole per phase, a unit segment coil group 10 consisting of 3 segment coils 12a and 12b is formed.

[0070] When q≧3, a unit segment coil group 10, which is provided with segment coils 12 having two or more different slot pitches, has q-1 segment coils with a slot pitch of k+1 and 1 segment coil with a slot pitch of k-(q-1). In Figure 18, since k+1=10, there are two segment coils 12a with a 10-slot pitch, and since k-(q-1)=7, there is one segment coil 12b with a 7-slot pitch. The segment coils 12a with a 10-slot pitch are shown by a dashed line, and the segment coils 12b with a 7-slot pitch are shown by a single dashed line.

[0071] Even with the addition of a group of unit segment coils 10 with transitions, the number of segment coil types 12 can be reduced to two, thereby decreasing setup and management costs during manufacturing and lowering the manufacturing cost of the stator 1. Furthermore, the productivity of the stator 1 can be improved. Additionally, as shown in Figures 19 and 20, by placing the segment coil 12b with a smaller slot pitch inside the segment coil 12a with a larger slot pitch, the coil ends can be made lower, resulting in a smaller stator 1 for the rotating electric machine 100.

[0072] Embodiment 4. The stator 1 of the rotating electric machine 100 according to Embodiment 4 will be described. Figure 21 is a diagram showing the wiring sequence for one phase of the winding 5 of the stator 1 of the rotating electric machine 100 according to Embodiment 4, Figure 22 is a diagram showing the wiring sequence for one phase of the winding 5 of the stator 1 of another rotating electric machine 100, Figure 23 is a diagram showing an excerpt of the wiring of a unit relay group 11 without transitions, Figure 24 is a top view of the unit relay group 11 without transitions, Figure 25 is a front view of the unit relay group 11 without transitions, Figure 26 is a diagram showing an excerpt of the wiring of a unit relay group 11 with transitions, Figure 27 is a top view of the unit relay group 11 with transitions, Figure 28 is a front view of the unit relay group 11 with transitions, Figure 29 is a diagram showing an excerpt of the wiring of another unit relay group 11 with transitions, Figure 30 is a top view of another unit relay group 11 with transitions, and Figure 31 is a front view of another unit relay group 11 with transitions. The stator 1 of the rotating electric machine 100 according to Embodiment 4 has a different configuration of the wires with transitions compared to the other embodiments. Configurations that are equivalent to those shown in Embodiments 1, 2, and 3 will not be described.

[0073] The connection configuration of the conductor wires 7 shown in Figure 21 will now be explained. In Figure 21, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0074] In Figure 21, the number of conductors in a slot T is 4, the number of slots per pole per phase q is 3, and the number of pole pairs p is 3. In Figure 21, there are 3 phases and 3 slots per pole per phase, so one conductor wire 7 of the same phase on each line is arranged at a 9-slot pitch. In Figure 21, three unit windings 9 are formed at six locations by connecting two adjacent groups. Since there are 3 slots per pole per phase q, a unit segment coil group 10 consisting of 3 segment coils is formed. In Figure 21, the number of rows M of the unit segment coil group 10 is 1. The starting points of the three unit windings 9 at the six locations are WSC1, WSC2, and WSC3, and the ending points are WEC1, WEC2, and WSC3.

[0075] Q connecting wires are provided for each pole and each phase, corresponding to the number of slots q, between the conductor wire of line 1 in one unit winding 9 and the conductor wire 7 of line 1 in another unit winding 9 of the same phase adjacent to one side in the circumferential direction of the conductor wire of line 1. These q connecting wires constitute the unit connecting wire group 11 on the line 1 side. Q connecting wires are provided for each pole and each phase, corresponding to the number of slots q, between the conductor wire 7 of line T in one unit winding 9 and the conductor wire 7 of line T in another unit winding 9 adjacent to the other side in the circumferential direction of the conductor wire 7 of line T. These q connecting wires constitute the unit connecting wire group 11 on the line T side.

[0076] In Figure 21, since the number of conductors T in a slot is 4, the conductor wire 7 of the 4th wire in one unit winding 9 is connected to the conductor wire 7 of the 4th wire in another unit winding 9 adjacent to it on the other circumferential side by a jumper wire. In Figure 21, since the number of slots q per pole per phase is 3, three jumpers are provided in each unit jumper wire group 11.

[0077] When (T / 2)×2p / q=x (where x is a natural number) and q≧3, the unit relay group 11 on track T is provided with relays having two or more different slot pitches. In Figure 21, x is 4, q is 3, and T is 4, so the unit relay group 11 on track 4, labeled 11, is provided with segment coils having two different slot pitches. The unit relay group 11 with transitions is provided with one relay with an 11-slot pitch and two relays with an 8-slot pitch. Relays with an 11-slot pitch are shown with a dashed line, and relays with an 8-slot pitch are shown with a double-dashed line.

[0078] Due to the transition, the connection path for each conductor wire 7 from WSC1 to WEC1 is U1 (8) → U3 (8) → U2 (8). Due to the transition, the connection path for each conductor wire 7 from WSC2 to WEC2 is U2 (8) → U1 (8) → U3 (8). Due to the transition, the connection path for each conductor wire 7 from WSC3 to WEC3 is U3 (8) → U2 (8) → U1 (8).

[0079] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0080] Next, the connection configuration of the conductor wires 7 shown in Figure 22 will be explained. In Figure 22, the winding 5 has three phases: U-phase, V-phase, and W-phase. Each phase has three windings connected in parallel. The conductor wires 7 that make up each of the three U-phase windings are labeled U1, U2, and U3 in the figure.

[0081] In Figure 22, the number of conductors in a slot T is 4, the number of slots per pole per phase q is 3, and the number of pole pairs p is 3. In Figure 22, there are 3 phases and 3 slots per pole per phase, so one conductor wire 7 of the same phase on the same line is arranged at a 9-slot pitch. In Figure 22, three unit windings 9 are formed at six locations by connecting two adjacent groups. Since there are 3 slots per pole per phase q, a unit segment coil group 10 consisting of 3 segment coils is formed. In Figure 22, the number of rows M of the unit segment coil group 10 is 1. The starting points of the three unit windings 9 at the six locations are WSC1, WSC2, and WSC3, and the ending points are WEC1, WEC2, and WSC3. In Figure 22, similar to the connection configuration of the conductor wires 7 shown in Figure 21, a unit jumper group 11 on the line 1 side consisting of 3 jumpers and a unit jumper group 11 on the line 4 side consisting of 3 jumpers are provided.

[0082] When (T / 2)×2p / q=x (where x is a natural number) and q≧3, the unit relay group 11 on track 1 is provided with relays having two or more different slot pitches. In Figure 22, since x is 4 and q is 3, the unit relay group 11 on track 1, labeled 11, is provided with segment coils having two different slot pitches. The unit relay group 11 with transitions is provided with one relay with an 11-slot pitch and two relays with an 8-slot pitch. Relays with an 11-slot pitch are shown with a dashed line, and relays with an 8-slot pitch are shown with a double-dashed line.

[0083] Due to the transition, the connection path for each conductor wire 7 from WSC1 to WEC1 is U1 (4) → U3 (8) → U2 (8) → U1 (4). Due to the transition, the connection path for each conductor wire 7 from WSC2 to WEC2 is U2 (4) → U1 (8) → U3 (8) → U2 (4). Due to the transition, the connection path for each conductor wire 7 from WSC3 to WEC3 is U3 (4) → U2 (8) → U1 (8) → U3 (4).

[0084] In this way, in the connection paths of each conductor wire 7, U1, U2, and U3 provided in each slot 4 can be wound evenly, so circulating current can be prevented by repeating a simple pattern, eliminating the need for transitions using irregularly shaped wires or connection plates, keeping the shape of the winding 5 simple, simplifying the connection paths of each conductor wire 7, and allowing for a lower profile coil end. As the connection paths of each conductor wire 7 are simplified and the coil ends are lower profile, a smaller and lower-cost stator 1 for the rotating electric machine 100 can be obtained.

[0085] The shape of the connecting wire 13 will now be explained. First, a unit connecting wire group 11 without transitions will be explained using Figures 23 to 25. In Figure 23, there are 3 phases and 3 slots per pole per phase, so one identical phase conductor wire 7 of the same line is arranged at a 9-slot pitch. Because 3 slots per pole per phase, a unit connecting wire group 11 consisting of 3 connecting wires 13 is formed. Since there are no transitions, the 3 connecting wires 13 have the same shape, as shown in Figures 24 and 25.

[0086] Next, the unit transit group 11 with a transition will be explained using Figures 26 to 28. In Figure 26, the number of phases is 3, and the number of slots q per pole per phase is 3, so k is 9. Because the number of slots q per pole per phase is 3, a unit transit group 11 consisting of 3 transits 13a and 13b is formed.

[0087] When q≧3, a unit group of connecting wires 11, which is provided with connecting wires 13 having two or more different slot pitches, has one connecting wire with a slot pitch of k+(q-1) and q-1 connecting wires with a slot pitch of k-1. In Figures 26 to 28, since k+(q-1)=11, there is one connecting wire 13a with an 11-slot pitch, and since k-1=8, there are two connecting wires 13b with an 8-slot pitch. In Figure 26, the connecting wire 13a with an 11-slot pitch is shown by a dashed line, and the connecting wires 13b with an 8-slot pitch are shown by a double-dashed line.

[0088] Even with the inclusion of a unit relay group 11 with transitions, the number of relay types 13 can be reduced to two, thus decreasing the setup and management costs during manufacturing, and thus reducing the manufacturing cost of stator 1. Furthermore, the reduced setup and management costs during manufacturing improve the productivity of stator 1.

[0089] Next, another unit relay group 11 with a transition will be explained using Figures 29 to 31. In Figure 29, there are 3 phases and 3 slots per pole per phase, so one identical phase conductor wire 7 of the same line is arranged at a 9-slot pitch. Because 3 slots per pole per phase, a unit relay group 11 consisting of 3 relays 13a and 13b is formed.

[0090] When q≧3, a unit group of connecting wires 11, which is provided with connecting wires 13 having two or more different slot pitches, has q-1 connecting wires with a slot pitch of k+1 and 1 connecting wire with a slot pitch of k-(q-1). In Figures 29 to 31, since k+1=10, there are two connecting wires 13a with a 10-slot pitch, and since k-(q-1)=7, there is one connecting wire 13b with a 7-slot pitch. In Figure 29, the connecting wires 13a with a 10-slot pitch are shown by dashed lines, and the connecting wires 13b with a 7-slot pitch are shown by single dashed lines.

[0091] Even with the inclusion of a unit relay group 11 with transitions, the number of relay types 13 can be reduced to two, thus decreasing the setup and management costs during manufacturing, and thus reducing the manufacturing cost of stator 1. Furthermore, the reduced setup and management costs during manufacturing improve the productivity of stator 1.

[0092] Furthermore, 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 envisioned within the scope of the art disclosed in this specification. For example, these include modifying, adding or omitting at least one component, or even extracting at least one component and combining it with a component from another embodiment. [Explanation of Symbols]

[0093] 1 Stator, 2 Rotor, 2a Rotating shaft, 2b Rotor core, 3 Core, 3a Yoke, 3b Teeth, 4 Slot, 5 Winding, 6 U-shaped conductor wire, 6a Main body, 6a1 Insulation coating, 6b Exposed conductor end, 7 Conductor wire, 8, 8a, 8b Group, 9 Unit winding, 10 Unit segment coil group, 11 Unit crossover group, 12, 12a, 12b Segment coil, 13, 13a, 13b Crossover, 100 Rotating Electric Machine

Claims

1. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one group and the conductor wire of the 2m+1-gauge of the other group. These q segment coils constitute a unit segment coil group, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. A stator of a rotating electric machine in which, when (T / 2) / q = n (where n is a natural number) and n ≥ 1, the M-row unit segment coil group is provided with segment coils having two or more different slot pitches.

2. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one group and the conductor wire of the 2m+1-gauge of the other group. These q segment coils constitute a unit segment coil group, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. A stator of a rotating electric machine in which, when (T / 2) / q = n (where n is a natural number) and n ≥ 2, the unit segment coil group of (q-1) columns is provided with two or more different types of segment coils having the aforementioned slot pitches.

3. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one of the aforementioned groups with the conductor wire of the 2m+1-gauge of the other aforementioned group, and these q segment coils constitute a unit segment coil group. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. A number of connecting wires is provided, corresponding to the number of slots q, between the conductor wire of the first wire in one unit winding and the conductor wire of the T wire in another unit winding of the same phase that is circumferentially adjacent to the conductor wire of the first wire. These q connecting wires are called a unit connecting wire group, the number of pole pairs is p, and the number of slots from one slot on the circumferential side to the other slot in the circumferential direction where the connecting wire is provided is called the slot pitch. A stator of a rotating electric machine in which, when (T / 2) × p / q = r (where r is a natural number) and p / q = s (where s is a natural number), the unit group of connecting wires is provided with connecting wires having two or more different slot pitches.

4. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one group and the conductor wire of the 2m+1-gauge of the other group. These q segment coils constitute a unit segment coil group, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. A number of jumpers is provided, corresponding to the number of slots q, connecting the conductor wire of the first wire in one unit winding to the conductor wire of the T wire in another unit winding of the same phase that is circumferentially adjacent to the conductor wire of the first wire. These q jumpers form a unit jumper group, and the number of pole pairs is p. A stator of a rotating electric machine in which, when (T / 2) × p / q = r (where r is a natural number) and p / q = s (where s is a natural number), the group of unit segment coils in a row of the unit winding is provided with segment coils having two or more different slot pitches.

5. Each of the multiple unit segment coil groups in the unit winding is provided with two or more different slot pitches. The stator of a rotating electric machine according to claim 4, wherein the group of unit segment coils provided with a slot pitch smaller than the maximum slot pitch is provided with two or more different types of segment coils having the aforementioned slot pitches.

6. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one group and the conductor wire of the 2m+1-gauge of the other group. These q segment coils constitute a unit segment coil group, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. A number of jumpers is provided, corresponding to the number of slots q, connecting the conductor wire of the first wire in one unit winding to the conductor wire of the T wire in another unit winding of the same phase that is circumferentially adjacent to the conductor wire of the first wire. These q jumpers form a unit jumper group, and the number of pole pairs is p. A stator of a rotating electric machine in which, when (T / 2) × p / q = r (where r is a natural number) and p / q ≠ s (where s is a natural number), the group of unit segment coils provided on a plurality of unit windings is provided with a group of unit segment coils in (q-1) rows arranged so as to be evenly spaced between the start and end points of the plurality of unit windings, and the group of unit segment coils having two or more different slot pitches.

7. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or in parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple windings of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one group and the conductor wire of the 2m+1-gauge of the other group. These q segment coils constitute a unit segment coil group, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the segment coils are provided is defined as the slot pitch. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. Q connecting wires are provided according to the number of slots q, connecting the conductor wire of the No. 1 wire in one unit winding to the conductor wire of the T wire in another unit winding of the same phase that is circumferentially adjacent to the conductor wire of the No. 1 wire, and these q connecting wires are called a unit connecting wire group. A stator of a rotating electric machine, in which q windings of the same phase are adjacent to each other in the circumferential direction, a row of the unit segment coils is provided with segment coils having two or more different slot pitches.

8. When q ≥ 3, The stator of a rotating electric machine according to any one of claims 1, 2, 4, 5, 6, or 7, wherein the unit segment coil group, which is provided with two or more types of slot pitches, is provided with one segment coil having a slot pitch of k+(q-1) and q-1 segment coils having a slot pitch of k-1.

9. When q ≥ 3, A stator for a rotating electric machine according to any one of claims 1, 2, 4, 5, 6, or 7, wherein the unit segment coil group, which is provided with two or more of the segment coils having the two or more slot pitches, is provided with q-1 segment coils having a slot pitch of k+1 and 1 segment coil having a slot pitch of k-(q-1).

10. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one of the aforementioned groups with the conductor wire of the 2m+1-gauge of the other aforementioned group, and these q segment coils constitute a unit segment coil group. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. Q connecting wires are provided according to the number of slots q, connecting the conductor wire of the first line in one unit winding to the conductor wire of the first line in another unit winding of the same phase adjacent to the circumferential side of the conductor wire of the first line, and these q connecting wires constitute the unit connecting wire group on the first line side. A number of connecting wires is provided, corresponding to the number of slots q, between the conductor wire of the T-number in one unit winding and the conductor wire of the T-number in another unit winding adjacent to the conductor wire of the T-number in the other circumferential direction. These q connecting wires are designated as the unit connecting wire group on the T-number side, the number of pole pairs is p, and the number of slots from the slot on one circumferential side to the slot on the other circumferential side where the connecting wire is provided is defined as the slot pitch. A stator of a rotating electric machine provided with two or more different types of connecting wires having the aforementioned slot pitches in the unit connecting wire group on the T-track side, where (T / 2) × 2p / q = x (where x is a natural number) and q ≥ 3.

11. A stator for a rotating electric machine comprising an iron core having a plurality of slots arranged in the circumferential direction, and a plurality of phase windings wound around the iron core, each having a plurality of layers of conductor wires arranged in each of the plurality of slots, The multiple layers of conductor wires are arranged in a radial line inside each of the multiple slots, from wire 1 to wire T (where T is the number of conductor wires inside the slot, an even number of 4 or more). Each of the multiple layers of conductor wires provided in one of the slots is connected in series or parallel with the conductor wires provided in other slots, forming a multi-phase winding having multiple winding portions of the same phase. Multiple groups are provided, each consisting of multiple layers of the same phase of conductor wires, arranged in a plurality of adjacent slots in the circumferential direction. The number of slots in one group is denoted as q (where q is a natural number of 2 or more), and other groups adjacent to one group are groups of other phases. One of the same phase conductor wires of the same line is arranged in each of the slots, evenly spaced in the circumferential direction. For each phase winding, in each set of multiple adjacent groups of the same phase, multiple unit windings are provided, each time spanning adjacent groups, consisting of overlapping windings that shift radially by one turn from one radially inward or outward side to the other side. On one axial side of the iron core, q segment coils are provided according to the number of slots q, connecting the conductor wire of the 2m-gauge (m is a natural number) of one of the aforementioned groups with the conductor wire of the 2m+1-gauge of the other aforementioned group, and these q segment coils constitute a unit segment coil group. The number of rows M in the aforementioned unit segment coil group is M = T / 2 - 1. Q connecting wires are provided according to the number of slots q, connecting the conductor wire of the first line in one unit winding to the conductor wire of the first line in another unit winding of the same phase adjacent to the conductor wire of the first line in one circumferential direction, and these q connecting wires are called the unit connecting wire group on the first line side, and the number of slots from the slot on one circumferential direction where the connecting wire is provided to the slot on the other circumferential direction is called the slot pitch. A number of jumpers is provided, corresponding to the number of slots q, connecting the conductor wire of the T-number wire in one unit winding to the conductor wire of the T-number wire in another unit winding adjacent to the conductor wire of the T-number wire on the other circumferential side. These q jumpers form a unit jumper group on the T-number wire side, with the number of pole pairs being p. A stator of a rotating electric machine provided with two or more different types of connecting wires having the aforementioned slot pitches in the unit connecting wire group on the track 1 side, where (T / 2) × 2p / q = x (where x is a natural number) and q ≥ 3.

12. When q ≥ 3, The stator of a rotating electric machine according to any one of claims 3, 10, or 11, wherein the unit group of connecting wires having two or more types of slot pitches is provided, and one connecting wire having a slot pitch of a + (q-1) and q-1 connecting wires having a slot pitch of k-1.

13. When q ≥ 3, A stator for a rotating electric machine according to any one of claims 3, 10, or 11, wherein the unit group of connecting wires having two or more types of slot pitches is provided with q-1 connecting wires having a slot pitch of a+1 and 1 connecting wire having a slot pitch of k-(q-1).

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