Stator unit

Abstract

A bus bar module (33) is disposed at a position alongside a stator in the axial direction and electrically connects phase windings of each phase of stator windings. The phase windings of each phase are provided in two systems for a power terminal of each phase. A plurality of partial windings for each system are connected in series by a bus bar. The bus bar module has a body part (42) that forms an annular shape and that comprises an insulating material, and a plurality of bus bars that are provided so as to be embedded in the body part, that extend in an arc shape in the circumferential direction, and that are disposed in a plurality of levels in the axial direction in the body part. Bus bars connecting partial windings of different phases are provided in the same level in the axial direction of the body part.

Description

Stator unit Cross-reference to related applications

[0001] This application is based on Japanese Application No. 2025-016422 filed on February 3, 2025, the contents of which are incorporated herein by reference.

[0002] The disclosure in this specification relates to a stator unit having a stator and a busbar module electrically connected to the stator winding.

[0003] In the stator of a rotating electric machine, the phase windings of each phase in the stator winding are connected using a busbar or the like. Also, in a configuration having a plurality of unit windings for each phase, the unit windings in each phase are electrically connected to each other using a busbar. Conventionally, a configuration in which the busbars of each phase are integrally provided as a busbar module is known.

[0004] For example, Patent Document 1 describes a configuration having a plurality of insulating rings and conductors (busbars) of each phase accommodated in the insulating rings as a connection device (busbar module) of a motor stator. More specifically, in the technology described in Patent Document 1, a four-layer insulating ring is provided as an insulating ring for accommodating the conductors of each phase, and three of them are insulating rings for accommodating the conductors for the U phase, V phase, and W phase of the stator winding one phase at a time, and the remaining one layer is an insulating ring for accommodating the conductor for the Y common point (neutral point).

[0005] Japanese Unexamined Patent Application Publication No. 2021-58074

[0006] Incidentally, in stator windings, two separate phase windings may be provided for each phase. In this case, the phase windings for each phase are branched from the power terminals of each phase into two separate systems, and multiple unit windings are connected in series by busbars for each system. When such a two-system winding structure is adopted, if the unit windings for each system in the stator are to have the same configuration (same part number) and are to be arranged in a series order around the circumference of the cylindrical stator core, the unit windings connected to the power terminals in each system of the same phase will be 180 degrees apart. Therefore, an extra layer is required to install a busbar that is half the length of the circumference, raising concerns that the axial length of the busbar module will be increased.

[0007] Furthermore, by differentiating the circumferential arrangement order of the unit windings (winding order from the power terminals) in the two systems, the unit windings connected to the power terminals can be brought closer together. However, in this case, the busbar connection configuration will differ for each system, resulting in intersections between busbars connecting in-phase partial windings when viewed circumferentially. And if the number of layers in which each busbar is arranged is increased to avoid interference between in-phase busbars, that is, if the busbars for each phase are arranged in two layers, there is a concern that the axial length of the busbar module will increase.

[0008] This disclosure is made in view of the above circumstances and aims to provide a stator unit that enables proper connection of two winding systems in the stator winding and shortens the shaft of the busbar module.

[0009] The stator unit of the present disclosure comprises: a stator having stator windings including phase windings of multiple phases; and a busbar module positioned in the axial direction on the stator and electrically connecting the phase windings of each phase, wherein the phase windings of each phase are provided in two systems for the power terminals of each phase, and each system consists of multiple partial windings connected in series by busbars; the busbar module comprises: a main body that is annular in shape and made of an insulating material; and a plurality of busbars embedded in the main body, extending in an arc shape in the circumferential direction and arranged in multiple layers in the axial direction on the main body, wherein the busbars connected to the partial windings of different phases are provided in the same layer in the axial direction on the main body.

[0010] In a stator winding configuration where each phase winding is provided in two separate systems for each phase's power terminal, the busbars (power terminal busbars) used to electrically connect the systems of the same phase windings in the busbar module become longer, or, when viewed circumferentially, busbars connecting partial windings of the same phase intersect. In this case, to avoid interference between busbars of the same phase, it is conceivable to increase the number of layers of busbars of the same phase, but such a configuration raises concerns about an increase in the axial length of the busbar module.

[0011] Therefore, in a busbar module where busbars are arranged in multiple layers, a configuration was adopted in which busbars connected to partial windings of different phases are provided on the same axial layer. In this case, busbars of the same phase that are likely to interfere with each other are arranged alternately, so that busbars of different phases are provided on the same axial layer. This makes it possible to properly arrange each busbar of the same phase without making the power terminal busbars excessively long or increasing the number of layers excessively. As a result, it is possible to properly connect two winding systems in the stator winding and shorten the axis of the busbar module.

[0012] The above-mentioned objectives and other objectives, features and advantages of this disclosure will become clearer from the following detailed description with reference to the attached drawings. The drawings are as follows: Figure 1 is a longitudinal section view showing the configuration of a rotating electric machine; Figure 2 is a perspective view showing the configuration of a stator; Figure 3 is a diagram showing the electrical configuration of the stator windings; Figure 4 is a diagram showing the circumferential arrangement order of the partial windings constituting each phase winding in the stator windings; Figure 5 is a perspective view showing the configuration of the partial windings; Figure 6 is a wiring diagram of a stator winding described as a comparative example; Figure 7 is a wiring diagram of a stator winding in an embodiment; Figure 8 is a perspective view showing the entire busbar module; and Figure 9 is a diagram showing the configuration of each axial layer in the busbar module in an exploded view. Figure 10 is a perspective view showing the third insulator and the busbars housed in the third insulator; Figure 11 is a perspective view showing multiple busbars housed in the bottommost first insulator; Figure 12 is a perspective view showing the second insulator superimposed on the first insulator and busbars housed in the second insulator; Figure 13 is a perspective view showing the third insulator superimposed on the second insulator and busbars housed in the third insulator; Figure 14 is a longitudinal cross-sectional view showing the arrangement of busbars in each layer of the busbar module; and Figure 15 is a diagram showing the electrical configuration of the stator winding.

[0013] The following describes one embodiment of a rotating electric machine with reference to the drawings. The rotating electric machine is used, for example, as a motor, generator, and MG (Motor Generator). It can be widely used for industrial, automotive, home appliance, office automation equipment, amusement machines, and the like. Figure 1 is a vertical cross-sectional view showing the configuration of the rotating electric machine 10, and Figure 2 is a perspective view showing the configuration of the stator 30.

[0014] The rotating electric machine 10 according to this embodiment is a synchronous multiphase AC motor and has an outer rotor structure (external rotation structure). The rotating electric machine 10 is equipped with a rotating shaft 11. In the following description, the direction in which the rotating shaft 11 extends is called the axial direction, the direction extending radially from the center of the rotating shaft 11 is called the radial direction, and the direction extending circumferentially with respect to the rotating shaft 11 is called the circumferential direction.

[0015] The rotating electric machine 10 comprises a rotor 20 and a stator 30. Both the rotor 20 and the stator 30 are arranged coaxially with the rotation shaft 11. Although not shown, the stator 30 is fixed to a stator holding member such as a housing, and the rotor 20 is assembled to the stator 30 in a manner that allows it to rotate.

[0016] The rotor 20 has a rotor carrier 21 formed in a hollow cylindrical shape and permanent magnets 22 arranged in an annular shape on the radially inner side of the rotor carrier 21. The rotor carrier 21 is substantially cup-shaped and functions as a magnet holding member. The rotor 20 is an SPM motor (SPM: Surface Permanent Magnet) with permanent magnets 22 arranged on its surface. The rotor carrier 21 is fixed to the rotation shaft 11, allowing the rotor 20 to rotate integrally with the rotation shaft 11. However, the configuration of the rotor 20 can be arbitrary, and it may be an embedded magnet type IPM rotor (IPM: Interior Permanent Magnet) or a wound field rotor.

[0017] The stator 30 is located radially inward of the rotor 20. The stator 30 includes stator windings 31 and a stator core 32. A busbar module 33, electrically connected to the stator windings 31, is provided at one axial end of the stator 30.

[0018] The stator core 32 is formed in an annular shape from laminated steel plates made of soft magnetic material. The stator core 32 has an annular back yoke 34 and a plurality of teeth 35 that protrude radially outward from the back yoke 34. The teeth 35 are, for example, rectangular prism-shaped and are provided at predetermined intervals in the circumferential direction. Slots 36 are formed between each tooth 35.

[0019] The stator winding 31 is provided with multiple layers of wire wound around each tooth 35 of the stator core 32. Note that Figure 2 shows only the windings for three teeth as the stator winding 31. The stator winding 31 is positioned to face the permanent magnets 22 of the rotor 20 across a predetermined air gap. The stator winding 31 consists of multiple phase windings. In this embodiment, the stator winding 31 is a three-phase winding consisting of U-phase, V-phase, and W-phase, and has a U-phase winding 31U, a V-phase winding 31V, and a W-phase winding 31W.

[0020] The busbar module 33 constitutes the electrical path for each phase in the stator winding 31, and is annular in shape, mounted on one side of the stator winding 31 in the axial direction. The busbar module 33 has multiple busbars for connecting the phase windings of each phase in a predetermined order. In the busbar module 33, the busbars for each phase are provided in multiple layers in the axial direction. However, the details will be described later.

[0021] The electrical configuration of the stator winding 31 is shown in Figure 3. As shown in Figure 3, the stator winding 31 is composed of a U-phase winding 31U, a V-phase winding 31V, and a W-phase winding 31W that are connected in a star configuration (Y-connection).

[0022] Each phase winding 31U, 31V, and 31W has two series coil groups provided for each phase's power terminal, and each phase winding 31U, 31V, and 31W is connected in a star configuration to each of these groups. Each of the two series coil groups in each phase winding 31U, 31V, and 31W has n (in this embodiment, n=4) partial windings 37. The number of windings in each series coil group can be changed. Each partial winding 37 can also be referred to as a unit winding, with each being considered as a single unit.

[0023] Specifically, the U-phase winding 31U has partial windings U1, U2, U3, and U4 as partial windings 37 for one series coil group, and partial windings U5, U6, U7, and U8 as partial windings 37 for the other series coil group. The V-phase winding 31V has partial windings V1, V2, V3, and V4 as partial windings 37 for one series coil group, and partial windings V5, V6, V7, and V8 as partial windings 37 for the other series coil group. The W-phase winding 31W has partial windings W1, W2, W3, and W4 as partial windings 37 for one series coil group, and partial windings W5, W6, W7, and W8 as partial windings 37 for the other series coil group.

[0024] In the following description, for each phase winding 31U, 31V, and 31W, one series coil group (a series coil group having partial windings U1 to U4, V1 to V4, and W1 to W4) is referred to as the "first series coil group S1," and the other series coil group (a series coil group having partial windings U5 to U8, V5 to V8, and W5 to W8) is referred to as the "second series coil group S2."

[0025] Furthermore, the following are connected to each other by a star connection with the neutral point N1: • A series coil group consisting of partial windings U1 to U4 in the U-phase winding 31U; • A series coil group consisting of partial windings V1 to V4 in the V-phase winding 31V; and • A series coil group consisting of partial windings W1 to W4 in the W-phase winding 31W. In other words, the first series coil group S1 of each phase is star-connected with the neutral point N1.

[0026] Furthermore, the following are connected to each other by a star connection with the neutral point N2: • A series coil group consisting of partial windings U5 to U8 in the U-phase winding 31U; • A series coil group consisting of partial windings V5 to V8 in the V-phase winding 31V; and • A series coil group consisting of partial windings W5 to W8 in the W-phase winding 31W. In other words, the second series coil group S2 of each phase is star-connected with the neutral point N2.

[0027] Each phase's partial winding 37 (U1 to U8, V1 to V8, W1 to W8) is connected to each other in pairs by busbars 41. The busbars 41 are made of elongated metal conductors.

[0028] Specifically, in the U-phase winding 31U, two partial windings U1 and U5 of the two series coil groups S1 and S2 that are connected to the U-phase power terminals are connected to each other by a power terminal busbar 41_U1, and the partial windings U1 to U4 and U5 to U8 of each series coil group S1 and S2 are connected to each other by intermediate busbars 41_U2 to 41_U7. Through the connection of these busbars 41_U1 to 41_U7, the partial windings U1 to U8 of the U-phase winding 31U are divided into two systems, with each system forming a series coil group S1 and S2.

[0029] Furthermore, in the V-phase winding 31V, two partial windings V1 and V5, which are connected to the V-phase power terminals, are connected to each other by a power terminal busbar 41_V1. In each series coil group S1 and S2, the partial windings V1 to V4 and V5 to V8 are connected to each other by intermediate busbars 41_V2 to 41_V7. Through the connection of these busbars 41_V1 to 41_V7, the partial windings V1 to V8 of the V-phase winding 31V are divided into two systems, each system becoming a series coil group S1 and S2.

[0030] In the W-phase winding 31W, two partial windings W1 and W5, which are connected to the W-phase power terminals, are connected to each other by a power terminal busbar 41_W1. The partial windings W1 to W4 and W5 to W8 of each series coil group S1 and S2 are connected to each other by intermediate busbars 41_W2 to 41_W7. Through the connection of these busbars 41_W1 to 41_W7, the partial windings W1 to W8 of the W-phase winding 31W are divided into two systems, each consisting of a series coil group S1 and S2.

[0031] In addition, in the first series coil group S1 of each phase winding 31U, 31V, and 31W, the partial windings U4, V4, and W4 on the opposite side of the power terminals are connected to each other by a neutral point busbar 41_N1. Furthermore, in the second series coil group S2 of each phase winding 31U, 31V, and 31W, the partial windings U8, V8, and W8 on the opposite side of the power terminals are connected to each other by a neutral point busbar 41_N2.

[0032] Figure 4 shows the circumferential arrangement order of the partial windings U1-U8, V1-V8, and W1-W8 that constitute each phase winding 31U, 31V, and 31W in the stator winding 31. For convenience, in Figure 4, only the reference numerals for the U-phase partial windings U1-U8 are enclosed. In the stator 30, the partial windings 37 for each phase are arranged in the order U-phase → V-phase → W-phase → U-phase →… in a counterclockwise direction as shown in the figure.

[0033] In Figure 4, the partial windings 37 on the left half, i.e., the partial windings 37 denoted by reference numerals 1 to 4, are partial windings that constitute the first series coil group S1 in each phase, and the partial windings 37 on the right half, i.e., the partial windings 37 denoted by reference numerals 5 to 8, are partial windings that constitute the second series coil group S2 in each phase.

[0034] Here, in each series coil group S1 and S2 of the U-phase winding 31U, the partial winding closest to the U-phase power terminal is designated as winding number 1, and the partial winding furthest from the U-phase power terminal is designated as winding number n (n=4). In this case, in the stator winding 31 shown in Figure 4, in the U-phase winding, the first windings of each series coil group S1 and S2 (U1 and U5) are positioned to be continuous in the circumferential direction as in-phase partial windings, and the nth windings of each series coil group S1 and S2 (U4 and U8) are also positioned to be continuous in the circumferential direction as in-phase partial windings. The same applies to the V-phase and W-phase windings.

[0035] In this embodiment, the windings continuously provided on the three teeth 35 arranged circumferentially in the stator core 32 are considered as a single partial winding 37. Therefore, in the stator 30, a total of 24 partial windings 37 are assembled, eight for each phase, for a total of 72 teeth 35 in the stator core 32.

[0036] Figure 5 is a perspective view showing one partial winding 37 assembled to three teeth 35 arranged in the circumferential direction. The partial winding 37 has three coil bodies 51 that are attached to each tooth 35 as a concentrated winding coil. Each coil body 51 is constructed by winding a conductor 53 around a bobbin 52 made of an insulating material such as synthetic resin. A set of three coil bodies 51 is constructed by continuously winding one conductor 53. The partial winding 37 has a pair of conductor ends 54 that are the ends of the conductor 53 and are drawn out in the radial direction. In the partial winding 37, the pair of conductor ends 54 are drawn out from each coil body 51 that is on both sides in the circumferential direction of the set of three coil bodies 51.

[0037] In the partial winding 37, the three coil bodies 51 arranged in the circumferential direction have opposite winding directions for the conductor 53 between each coil body 51 on the circumferential side and the coil body 51 in the circumferential center. However, the winding directions may all be the same in the three coil bodies 51. In this embodiment, all partial windings 37 of each phase in the stator 30 have the same configuration (same part number).

[0038] In Figure 4, among the U-phase partial windings U1 to U8, the partial windings U1 to U4 included in the first series coil group S1 are arranged at a predetermined pitch in the circumferential direction in an order in which the winding numbers are in descending order in the counterclockwise direction of the figure, and the partial windings U5 to U8 included in the second series coil group S2 are arranged at a predetermined pitch in the circumferential direction in an order in which the winding numbers are in descending order in the clockwise direction of the figure. The same applies to the V-phase partial windings V1 to V8 and the W-phase partial windings W1 to W8.

[0039] The following describes the configuration of the busbar 41 connections for the partial windings U1-U8, V1-V8, and W1-W8 of each phase wound around each tooth 35 of the stator core 32. Figure 6 is a wiring diagram of a stator winding described as a comparative example, and Figure 7 is a wiring diagram of the stator winding in this embodiment. In Figures 6 and 7, the left-right direction is the circumferential direction of the stator 30, and the configuration for one full turn of the stator is shown.

[0040] The stator windings 31 shown in Figures 6 and 7 have the same electrical configuration, and as shown in Figure 3, each has two series coil groups S1 and S2 in each phase. The upper part of Figures 6 and 7 shows the busbars 41 connected to the conductor ends 54 of each sub-winding 37, and the lower part shows the connection status of each sub-winding U1 to U8 in the U-phase winding 31U of the three-phase windings. Here, the configuration of the stator winding 31 will be explained mainly with reference to the configuration of the U-phase winding 31U.

[0041] As shown in Figure 6, in the comparative example, the U-phase partial windings U1 to U8 are arranged in descending order of winding number in the circumferential direction (to the right in the figure). The same applies to the V-phase partial windings V1 to V8 and the W-phase partial windings W1 to W8. In the stator winding 31, the partial windings U1 to U4 of the first series coil group S1 and the partial windings U5 to U8 of the second series coil group S2 are connected in series by busbars 41. In this case, for each phase, the conductor ends 54 on the side closest to each other are connected by busbars 41 to adjacent partial windings of the same phase in the circumferential direction. As a result, the partial windings U1 to U4 of the first series coil group S1 are connected in series, and the partial windings U5 to U8 of the second series coil group S2 are connected in series.

[0042] In the configuration shown in Figure 6, when current is supplied from the U-phase power terminal to each partial winding U1 to U8, the rotational magnetic flux of the U phase can be generated in the same manner in each partial winding U1 to U8. However, in the configuration shown in Figure 6, the power terminal busbar 41X connected to the U-phase power terminal is a busbar for electrically connecting partial winding U1 and partial winding U5, and has a length of approximately half a circumference (180 degrees) of the stator 30. The same applies to the other V-phase and W-phase power terminal busbars. In this case, the busbar 41 that connects adjacent partial windings of the same phase in the circumferential direction and the power terminal busbar 41X overlap. Therefore, in a busbar module having busbars 41 for each phase, two stages (two layers) of busbars are required for each phase, and a total of six stages of busbars are required. Consequently, the axial length of the busbar module 33 becomes larger, which is an inconvenience.

[0043] In contrast, in the configuration of the present embodiment shown in FIG. 7, as a difference from the configuration of FIG. 6, for example, in the U-phase winding 31U, the partial winding U1 of the first series coil group S1 and the partial winding U5 of the second series coil group S2 are adjacent to each other in the circumferential direction in the same-phase winding. Further, the partial windings U1 to U4 of the first series coil group S1 and the partial windings U5 to U8 of the second series coil group S2 are arranged in a descending order of winding numbers in directions opposite to each other in the circumferential direction (the left-right reverse direction in FIG. 7). Therefore, the circumferential length of the power terminal busbars (41_U1, 41_V1, 41_W1 in FIG. 3) extending from the power terminals of each phase is significantly shortened compared to the configuration of FIG. 6.

[0044] However, in the configuration of FIG. 7, since the arrangement order of the partial windings U5 to U8, V5 to V8, and W5 to W8 of each phase in the second series coil group S2 is different from that in FIG. 6, when connecting the partial windings of the same phase to each other with the busbar 41, the busbars 41 of the same phase overlap each other in the circumferential direction. For example, in the U phase, the busbars 41_U1 and 41_U5 are respectively connected to the pair of conductor ends 54 of the partial winding U5, and these busbars 41_U1 and 41_U5 cross each other. In addition, in the partial winding U June, the busbars 41_U5 and 41_U6 cross each other, in the partial winding U July, the busbars 41_U6 and 41_U7 cross each other, and in the partial winding U August, the busbars 41_U8 and 41_N2 cross each other. This crossing of the busbars of the same phase also occurs in the V phase and W phase other than the U phase. In this case, when the busbars 41 cross each other, there is a concern that the axial length of the busbar module 33 will increase even in the configuration of FIG. 7. Therefore, it is necessary to take measures against the crossing (overlap) of the busbars 41 in the partial windings of each phase in the second series coil group S2.

[0045] In the present embodiment, the busbar module 33 has a multi-stage hierarchical structure in the axial direction, and the busbars 41 of each phase are distributed to each layer and arranged side by side in the circumferential direction. In particular, a configuration is adopted in which busbars 41 connected to partial windings of different phases are provided in the same layer in the axial direction.

[0046] Figure 8 is a perspective view showing the entirety of the bus bar module 33, and Figure 9 is an exploded perspective view showing the configurations of the multiple layers in the axial direction (i.e., the thickness direction) of the bus bar module 33.

[0047] The bus bar module 33 includes a plurality of bus bars 41 that connect the partial windings 37 of each phase, and a main body 42 that holds the plurality of bus bars 41 embedded therein. The main body 42 is made of an insulating material such as synthetic resin and has an annular shape. As described above, the bus bar module 33 has: ・As the bus bar 41 of the U phase, a power terminal bus bar 41_U1 and intermediate bus bars 41_U2 to 41_U7; ・As the bus bar 41 of the V phase, a power terminal bus bar 41_V1 and intermediate bus bars 41_V2 to 41_V7; ・As the bus bar 41 of the W phase, a power terminal bus bar 41_W1 and intermediate bus bars 41_W2 to 41_W7.

[0048] Also, the bus bar module 33 has neutral point bus bars 41_N1 and 41_N2 as the bus bars 41 that constitute the two neutral points N1 and N2.

[0049] The main body 42 is a laminated insulating member formed by laminating four annular plate-shaped insulators 61, 62, 63, and 64 in the axial direction. In the main body 42, the respective bus bars 41 are distributively arranged in a plurality of layers formed by the insulators 61 to 64. Here, the insulators 61 to 64 of each layer are, in order from the bottom of the figure, the first insulator 61, the second insulator 62, the third insulator 63, and the fourth insulator 64. Among the four upper and lower insulators 61 to 64, the lower three insulators 61 to 63 from the bottom are bus bar accommodation layers that accommodate the bus bars 41, and the uppermost fourth insulator 64 is a lid layer.

[0050] Figure 10 is a perspective view showing the third insulator 63 and the plurality of bus bars 41 accommodated in the third insulator 63. In Figure 10, seven bus bars 41 such as bus bars 41_U1, 41_U2, and 41_N1 are shown arranged in the circumferential direction.

[0051] Busbar 41_U1 is a power terminal busbar and has a long section 71 extending in the circumferential direction, two arm sections 72 extending radially from the long section 71, and a power terminal arm 73 connected to a power terminal. Busbars 41_U2 to 41_U4, 41_V7, and 41_W6 are intermediate busbars and have a long section 71 extending in the circumferential direction and two arm sections 72 extending radially from the long section 71. Busbar 41_N1 is a neutral point busbar and has a long section 71 extending in the circumferential direction and three arm sections 72 extending radially from the long section 71. The arm sections 72 of each busbar 41 are all drawn out radially.

[0052] The third insulator 63 is provided with multiple busbar housing grooves 81 for housing the busbars 41. Each busbar housing groove 81 has a portion for housing the elongated portion 71 of the busbar 41 and a portion for housing the arm portion 72. When each busbar 41 is housed in a busbar housing groove 81, the tip of the arm portion 72 of each busbar 41 protrudes radially outward from the third insulator 63 (see Figure 8), and the conductor ends 54 of each partial winding 37 are connected to the tip of the arm. The other layers have a similar configuration, with the busbars 41 housed in the busbar housing grooves 81 formed in each insulator 61, 62.

[0053] In the busbar module 33 shown in Figures 8 and 9, the insulators 61 to 64 are stacked in layers, with the busbars 41 housed in the busbar housing grooves 81 at each level.

[0054] The arrangement of the busbars 41 provided in the insulators 61 to 63 of each layer in the busbar module 33 will be described in detail below. Figure 11 is a perspective view showing the state in which the busbar 41 is housed in the lowest layer, the first insulator 61. Figure 12 is a perspective view showing the state in which the second insulator 62 is superimposed on the first insulator 61 and the busbar 41 is housed in the second insulator 62. Figure 13 is a perspective view showing the state in which the third insulator 63 is superimposed on the second insulator 62 and the busbar 41 is housed in the third insulator 63. For the sake of explanation, in Figures 11 to 13, the reference numerals of the power terminal busbars 41 of each phase and the busbars 41 connected between the partial windings of the first series coil group S1 are enclosed in boxes.

[0055] As shown in Figure 11, the first insulator 61 is fitted with U, V, and W phase busbars 41. Specifically, it is fitted with: - U phase busbars 41_U5, 41_U7; - V phase busbars 41_V1 to 41_V4, 41_V6; and - W phase busbars 41_W5, 41_W7.

[0056] Furthermore, the first insulator 61 is provided with busbars 41 arranged in two radial rows. Specifically, of the busbars 41 provided in the first insulator 61, the U-phase busbar 41_U5, the V-phase busbars 41_V1 to 41_V4, and the W-phase busbar 41_W7 are arranged in the radially inner row, and the U-phase busbar 41_U7, the V-phase busbar 41_V6, and the W-phase busbar 41_W5 are arranged in the radially outer row.

[0057] For example, the V-phase busbar 41_V1 and the W-phase busbar 41_W5 are arranged side by side, inside and outside the radial direction. In this case, each of these busbars 41 overlaps with each other only to a limited extent in the circumferential direction, and one of the pair of arm portions 72 of the radially inner busbar 41_V1 is drawn out radially using the region in the circumferential direction where the radially outer busbar 41_W5 is absent. In other words, the arm portion 72 of the radially inner busbar 41_V1 is drawn out using the dead space where the radially outer busbar 41_W5 (the side on which the arm portion is drawn out) is absent.

[0058] The two busbars 41, which are aligned radially, are configured such that the arm portion 72 of one busbar 41 and the elongated portion 71 of the other busbar 41 intersect each other in a three-dimensional manner while being spaced apart in the axial direction. In addition, a partition plate 75, which serves as an insulating member, is interposed between the arm portion 72 and the elongated portion 71 that intersect each other in a three-dimensional manner in the two radially aligned busbars 41.

[0059] Specifically, the elongated portions 71 of the radially outward-facing busbars 41_U7, 41_V6, and 41_W5 each have a bent portion 71a formed in the axial direction (see Figure 9), and this bent portion 71a prevents interference with the arm portion 72 of each radially outward-facing busbar 41. The bent portion 71a corresponds to the three-dimensional intersection. A partition plate 75 is provided so as to surround the bent portion 71a of each elongated portion 71.

[0060] In addition, to avoid interference between the arm portion 72 and the elongated portion 71 of each bus bar 41 which are radially inward and outward, it is also possible to configure the arm portion 72 of the elongated portion 71 to have a bent portion that is bent in the axial direction, unlike the above configuration.

[0061] Furthermore, the first insulator 61 is provided with busbars 41 arranged circumferentially, each connected to a separate winding 37 of a different phase. In particular, each layer of the first insulator 61 is provided with busbars 41 (busbars 41 for three phases) connected to each of the three phase windings 37.

[0062] In Figure 11, the first insulator 61 has a V-phase power terminal busbar 41_V1 and busbars 41_V2 to 41_V4 connected to the first series coil group S1 of the V-phase arranged in a circumferential direction. In addition, in the remaining circumferential area of ​​the first insulator 61 where the V-phase busbars 41_V1 to 41_V4 are not arranged, busbars 41 connected to the second series coil group S2 of a different phase (a phase different from the V-phase) (U-phase busbars 41_U5, 41_U7 and W-phase busbars 41_W5, 41_W7) are arranged in a circumferential direction.

[0063] As shown in Figure 12, the second insulator 62 is fitted with busbars 41 for the V and W phases and a busbar 41 for the neutral point N2. Specifically, it is fitted with: busbars 41_V3 and 41_V5 which are the V phase busbars, busbars 41_W1 to 41_W4 which are the W phase busbars, and a neutral point busbar 41_N2. The second insulator 62 is provided with busbars 41 arranged in the circumferential direction, each connected to a partial winding 37 of a different phase.

[0064] In Figure 12, the second insulator 62 has a W-phase power terminal busbar 41_W1 and busbars 41_W2 to 41_W4 connected to the first series coil group S1 of the W-phase arranged in a circumferential direction. In addition, in the remaining circumferential area of ​​the second insulator 62 where the W-phase busbars 41_V1 to 41_V4 are not arranged, busbars 41 connected to the second series coil group S2 of a different phase (a phase different from the W-phase) (V-phase busbars 41_V3, 41_V5) and a neutral point busbar 41_N2 are arranged in a circumferential direction.

[0065] Furthermore, the second insulator 62 is provided with a recess 62a on its radially outer edge (see Figure 9). This recess 62a is a notch that allows the bent portion 71a (three-dimensional intersection) of the busbar 41, which is provided in the layer of the first insulator 61, to pass through in the axial direction. This suppresses interference between the bent portion 71a of the busbar 41, which is provided in the layer of the first insulator 61, and the second insulator 62.

[0066] As shown in Figure 13, the third insulator 63 is fitted with busbars 41 for the U, V, and W phases and a busbar 41 for the neutral point N1. Specifically, it is fitted with: - Busbars 41_U1 to 41_U4, which are the busbars 41 for the U phase; - Busbar 41_V7, which is the busbar 41 for the V phase; - Busbar 41_W6, which is the busbar 41 for the W phase; and - The neutral point busbar 41_N1. The third insulator 63 is provided with busbars 41 arranged in the circumferential direction, each connected to a partial winding 37 of a different phase. In particular, the layers of the third insulator 63 are provided with busbars 41 (busbars 41 for three phases) connected to the partial winding 37 of each of the three phases.

[0067] In Figure 13, the third insulator 63 has a U-phase power terminal busbar 41_U1 and busbars 41_U2 to 41_U4 connected to the first series coil group S1 of the U-phase arranged in a circumferential direction. In addition, in the remaining circumferential area of ​​the third insulator 63 where the U-phase busbars 41_U1 to 41_U4 are not arranged, busbars 41 connected to the second series coil group S2 of a different phase (a phase different from the U-phase) (V-phase busbar 41_V7, W-phase busbar 41_W6) and a neutral point busbar 41_N1 are arranged in a circumferential direction.

[0068] Furthermore, the third insulator 63 is provided with a recess 63a on its radially outer edge (see Figure 9). This recess 63a is a notch that allows the bent portion 71a (three-dimensional intersection) of the busbar 41, which is provided in the layer of the first insulator 61, to pass through in the axial direction. This suppresses interference between the bent portion 71a of the busbar 41, which is provided in the layer of the first insulator 61, and the third insulator 63.

[0069] Then, by stacking the fourth insulator 64 on top of the third insulator 63, the busbar module 33 shown in Figure 8 is formed. In the busbar module 33, the power terminal busbars 41_U1, 41_V1, and 41_W1 for each phase are located in different layers in the axial direction and overlap each other in the circumferential direction. The elongated holes 64a provided in three locations in the circumferential direction of the fourth insulator 64 are insertion parts for inserting the upper end of the partition plate 75.

[0070] Figure 14 is a longitudinal cross-sectional view showing the arrangement of busbars 41 at each level in the busbar module 33. Figure 14 is a cross-sectional view taken along line 14-14 of Figure 8.

[0071] As described above, in the busbar module 33, busbars 41 are embedded in each axial layer of the first to third insulators 61 to 63. Of these, the busbar 41_U7 assembled to the first insulator 61 has a bent portion 71a in its elongated portion 71 (see Figure 9), and in Figure 14, the bent portion 71a of the busbar 41_U7 is positioned radially outward of the busbar 41_V7 of the third insulator 63. In this case, the busbar 41_U7 is provided in the first insulator 61, which is the lowest layer in Figure 9, but the bent portion 71a of the busbar 41_U7 is bent toward the third insulator 63, which is the upper layer, and is positioned in a non-existent region in the layer of the third insulator 63 where no busbars 41 exist.

[0072] In this embodiment, the above configuration provides the following excellent effects.

[0073] In the busbar module 33, busbars 41 connected to partial windings 37 of different phases are provided on the same axial level. In this case, busbars 41 of the same phase that are likely to interfere with each other are arranged alternately, so that busbars 41 of different phases are provided on the same axial level. This allows for the proper arrangement of each busbar 41 of the same phase without making the power terminal busbars excessively long or increasing the number of levels excessively. As a result, the stator winding 31 can be properly connected to two winding systems, and the length of the busbar module 33 can be shortened.

[0074] In the busbar module 33, busbars 41 connected to partial windings 37 of different phases are arranged circumferentially at the same axial level. In this case, among the busbars 41 of the same phase arranged circumferentially, one of the busbars 41 that intersect each other circumferentially is swapped with a busbar 41 of the other phase, so that busbars 41 of different phases are arranged circumferentially. This makes it possible to achieve an appropriate busbar arrangement by swapping the busbars 41 of each phase.

[0075] In the busbar module 33, busbars 41 connected to the partial windings 37 of each of the three phases are provided on one of the same axial levels. In this case, even if the busbars 41 are of different phases, they are placed on the same level, which is advantageous for shortening the axial length of the busbar module 33.

[0076] In the series coil groups S1 and S2 of the stator winding 31, the first windings (for example, U-phase partial windings U1 and U5), which are the partial windings closest to the power terminals, are arranged in a position that is circumferentially continuous within the partial windings of the same phase. In addition, the nth windings (for example, U-phase partial windings U4 and U8) of each series coil group S1 and S2 are arranged in a position that is circumferentially continuous within the partial windings of the same phase. This makes it possible to shorten the length of the power terminal busbar as much as possible. However, in this case, circumferential intersection occurs between busbars 41 of the same phase. In this regard, the busbar module 33 is configured so that the busbar 41 connecting the partial windings of the first series coil group S1 of one phase and the busbar 41 connecting the partial windings of the second series coil group S2 of the other phase are provided at the same axial level. This effectively suppresses the inconvenience of busbars 41 intersecting each other at the same level, even if busbars 41 of the same phase intersect in the circumferential direction.

[0077] In the same layer of the busbar module 33, power terminal busbars of the same phase and busbars 41 connected to the first series coil group S1 are arranged in a circumferential direction, and in the remaining circumferential area where these busbars are not arranged, busbars 41 connected to the second series coil group S2 of a different phase are arranged in a circumferential direction. This configuration effectively suppresses the inconvenience of busbars 41 intersecting each other in the same layer, even if circumferential intersection occurs between busbars 41 of the same phase.

[0078] In the busbar module 33, the power terminal busbars for each phase (41_U1, 41_V1, 41_W1) are arranged in different axial layers and overlapping positions in the circumferential direction. In this configuration, the power terminal busbars for each phase are arranged together, making it easier to connect to inverters and the like.

[0079] In the main body 42 of the busbar module 33, the arm portion 72 of one of the two busbars 41 that are radially aligned at the same axial level is extended radially using a region in the circumferential direction where the other busbar 41 is absent. This makes it possible to utilize the dead space in the main body 42 and realize a configuration that is advantageous for shortening the axis of the busbar module 33.

[0080] In the main body 42 of the busbar module 33, the arm portion 72 of one of the two busbars 41 that are radially aligned at the same axial level and the elongated portion 71 of the other busbar 41 are configured to intersect each other in a three-dimensional manner while being spaced apart in the axial direction. This allows multiple busbars 41 to be properly arranged at the same level while avoiding interference between the busbars 41, and realizes a configuration that is advantageous for shortening the axis of the busbar module 33.

[0081] In the main body 42 of the busbar module 33, the arm portion 72 of one of the two radially aligned busbars 41 and the elongated portion 71 of the other busbar 41 intersect each other in a three-dimensional manner, and an insulating partition plate 75 is interposed between the arm portion 72 and the elongated portion 71. This configuration effectively suppresses short circuits between the busbars 41.

[0082] As a grade-separated intersection structure for busbars 41, the bent portion 71a of the busbar 41, which is the grade-separated intersection, is positioned in a non-existent area (dead space) where no busbars 41 exist on other levels of the busbar module 33. This configuration allows for the proper realization of a grade-separated busbar intersection structure without increasing the size of the busbar module 33 due to the grade-separated intersection of the busbars 41.

[0083] In the busbar module 33, a plurality of insulators 61 to 64, each housing a busbar 41, are stacked. This makes it easy to achieve the desired arrangement of busbars 41 in the circumferential, axial, and radial directions in each layer of the busbar module 33.

[0084] (Other Embodiments) The above embodiments may be modified as follows, for example.

[0085] ・In the stator 30 of the above embodiment, the stator winding 31 may be configured to be star-connected with a single neutral point. That is, the stator winding 31 may be configured as shown in Figure 15. In the stator winding 31 shown in Figure 15, in the phase winding of each phase, two series coil groups S1 and S2, each provided for the power terminal of each phase, are provided in parallel with each other. In this configuration, the phase windings of each phase are connected by a single neutral point N. In this case, the neutral point busbar 41_N is connected to the two parallel series coil groups S1 and S2 for each phase, i.e., a total of six series coil groups. In the busbar module 33, the neutral point busbar 41_N preferably has a configuration having a long portion 71 extending in the circumferential direction and six arm portions 72 extending radially from the long portion 71. Furthermore, in the stator winding 31, if the neutral point is configured by a single neutral point busbar 41_N, in the configuration of Figure 9, for example, the neutral point busbar 41_N is placed on the third insulator 63, and the layers of busbars such as 41_V7 are changed. Similarly, in the stator winding 31 shown in Figure 15, it is preferable that busbars 41 connected to partial windings 37 of different phases are provided in the busbar module 33 at the same layer in the axial direction.

[0086] In the above embodiment, the arm portions 72 of each busbar 41 in the busbar module 33 are all extended radially outward. However, this can be changed so that the arm portions 72 of each busbar 41 are all extended radially inward. In this case, the connection with the conductor ends 54 of each partial winding 37 is made on the radially inward (inner circumference) side of the busbar module 33.

[0087] In the above embodiment, the main body 42 of the busbar module 33 is composed of four layers of insulators 61 to 64 in the axial direction, but this configuration can be changed. For example, a resin molding die may be used to form a configuration in which the busbars 41 are arranged in three layers in the axial direction, and the entire structure is covered by resin molding.

[0088] As a configuration in which multiple layers of insulators are molded together, the main body 42 of the busbar module 33, with multiple busbars 41 embedded inside, can be molded using a multi-stage resin molding process. For example, when the main body 42 is molded using a two-stage resin molding process, a primary molded body containing two layers of insulators (insulators 61, 62) out of the four layers of insulators 61 to 64 of the busbar module 33 is molded using a resin molding process. Then, a secondary molded body containing the remaining two layers of insulators (insulators 63, 64) is molded onto the primary molded body using a resin molding process.

[0089] The method for molding the main body 42 by multi-stage resin molding may be other than those described above. For example, a primary molded body containing two layers of insulators (insulators 61, 62) may be molded, a secondary molded body containing one layer of insulator (insulator 63) may be molded onto the primary molded body, and then a tertiary molded body containing the remaining one layer of insulator (insulator 64) may be molded onto the secondary molded body. It is also possible to resin mold the main body 42 in four stages by stacking one layer at a time.

[0090] In the above embodiment, the partial winding 37 is defined as a winding continuously provided on three teeth 35 arranged circumferentially on the stator core 32 (see Figure 5), but this configuration can be changed. For example, each partial winding 37 may be a winding wound around one tooth 35 on the stator core 32.

[0091] The rotating electric machine is not limited to those used as vehicle-mounted main engines; for example, it may also be a rotating electric machine used as an ISG (Integrated Starter Generator), which is both an electric motor and a generator.

[0092] The mobile body on which the rotating electric machine system is mounted is not limited to a vehicle; for example, it may be an aircraft or a ship. Furthermore, the rotating electric machine system is not limited to a system mounted on a mobile body; it may be a stationary system.

[0093] The technical concept extracted from the above-described embodiment is described below. [Configuration 1] A stator unit comprising: a stator (30) having a stator winding (31) including multiple phase windings; a busbar module (33) positioned in the axial direction on the stator and electrically connecting the phase windings of each phase, wherein the phase windings of each phase are provided in two systems for the power terminals of each phase, and each system has multiple partial windings (37) connected in series by busbars (41); the busbar module comprises: a main body (42) that is annular and made of insulating material; and multiple busbars that are embedded in the main body, extend in an arc shape in the circumferential direction, and are arranged in multiple layers in the axial direction on the main body, wherein the busbars connected to the partial windings of different phases are provided in the same layer in the axial direction on the main body. [Configuration 2] The stator unit according to Configuration 1, wherein the busbars connected to the partial windings of different phases are arranged in a circumferential direction on the same axial level in the main body of the busbar module. [Configuration 3] The stator unit according to Configuration 1 or 2, wherein the stator winding has three phase windings, and the busbars connected to each of the three phase partial windings are provided on any of the same axial levels in the main body of the busbar module.[Configuration 4] The phase windings of each phase are connected to the power terminals of each phase and each has n partial windings connected in series as two series coil groups, a first series coil group (S1) and a second series coil group (S2), and in the first series coil group and the second series coil group of the same phase, the partial winding closest to the power terminal is designated as the 1st winding and the partial winding furthest from the power terminal is designated as the nth winding, and the stator winding is configured such that the 1st windings of the first series coil group and the second series coil group are positioned to be circumferentially continuous as partial windings of the same phase, and the nth windings of the first series coil group and the second series coil group are positioned to be circumferentially continuous as partial windings of the same phase. A stator unit according to any one of configurations 1 to 3, wherein the busbar module has a busbar connecting partial windings of one phase of the first series coil group and a busbar connecting partial windings of other phases of the second series coil group, both located at the same axial level. [Configuration 5] A stator unit according to configuration 4, wherein the busbar module has a power terminal busbar for each phase winding of each series coil group, connecting the first winding of each series coil group to the power terminal, and at the same level of the busbar module, the power terminal busbar of the same phase and the busbar connected to the first series coil group are arranged side by side in the circumferential direction, and the busbar connected to the second series coil group of a different phase is arranged side by side in the circumferential direction in the remaining circumferential area where none of those busbars are located.[Configuration 6] The phase windings of each phase are connected to the power terminals of each phase and each has n sub-windings connected in series as two series coil groups, a first series coil group (S1) and a second series coil group (S2), and in the first series coil group and the second series coil group of the same phase, the sub-winding closest to the power terminal is designated as winding 1, and the sub-winding furthest from the power terminal is designated as winding n, in which case the stator windings are arranged such that the windings 1 of the first series coil group and the second series coil group are positioned to be circumferentially continuous as sub-windings of the same phase, and the windings n of the first series coil group and the second series coil group are positioned to be circumferentially continuous as sub-windings of the same phase, and the busbar module has a power terminal busbar for each phase winding that connects the winding 1 of each series coil group to the power terminal, A stator unit according to any one of configurations 1 to 5, wherein the power terminal busbars for each phase in the busbar module are provided at different levels in the axial direction and overlapping positions in the circumferential direction. [Configuration 7] A stator unit according to any one of configurations 1 to 6, wherein the busbar has a long portion (71) extending in the circumferential direction and an arm portion (72) extending radially from the long portion, the arm portion of each busbar is drawn out on the same side of the radial direction, the busbars are provided in the main body of the busbar module so as to be arranged in two radial rows at the same level in the axial direction, the two radially aligned busbars overlap each other only in the circumferential direction, and the arm portion of one of the two radially aligned busbars is drawn out radially using a region in the circumferential direction where the other busbar is absent.[Configuration 8] The stator unit according to any one of Configurations 1 to 7, wherein the busbar has a long portion (71) extending in the circumferential direction and an arm portion (72) extending radially from the long portion, the arm portion of each busbar is drawn out to the same side of the radial direction, the busbars are provided in the main body of the busbar module so as to be arranged in two radial rows at the same axial level, and the arm portion of one of the two radially aligned busbars and the long portion of the other busbar intersect each other in a three-dimensional manner while being spaced apart in the axial direction. [Configuration 9] The stator unit according to Configuration 8, wherein the arm portion of one of the two radially aligned busbars and the long portion of the other busbar intersect each other in a three-dimensional manner, and an insulating member (75) is interposed between the arm portion and the long portion. [Configuration 10] A stator unit according to Configuration 8 or 9, wherein the arm portion of one of the two busbars arranged radially and the elongated portion of the other busbar are bent in the axial direction, so that the arm portion and the elongated portion intersect in a three-dimensional manner, and the busbar that is bent in the axial direction among the arm portion and the elongated portion that intersect in a three-dimensional manner is bent toward the side of the other layer of the main body, and the three-dimensional intersection portion that intersects in a three-dimensional manner is located in a non-existent region in the other layer where the busbar does not exist. [Configuration 11] A stator unit according to any one of Configurations 1 to 10, wherein the main body of the busbar module has a plurality of annular plate-shaped insulators (61 to 64) stacked in the thickness direction, each insulator is provided with a busbar housing groove (81) for housing the busbar, and the insulators are stacked in layers with the busbar housing groove in place.

[0094] This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or fewer of those elements, fall within the scope and concept of this disclosure.

Claims

1. A stator unit comprising: a stator (30) having a stator winding (31) including multiple phase windings; and a busbar module (33) positioned in the axial direction on the stator and electrically connecting the phase windings of each phase, wherein the phase windings of each phase are provided in two systems for each phase's power terminal, and each system consists of multiple partial windings (37) connected in series by busbars (41); the busbar module comprises: a main body (42) that is annular in shape and made of insulating material; and multiple busbars embedded within the main body, extending in an arc shape in the circumferential direction and arranged in multiple layers in the axial direction on the main body, wherein the busbars connected to the partial windings of different phases are provided in the same layer in the axial direction on the main body.

2. The stator unit according to claim 1, wherein in the main body of the busbar module, busbars connected to the partial windings of different phases are arranged in a circumferential direction at the same axial level.

3. The stator unit according to claim 1, wherein the stator winding has three phase windings, and the busbars connected to each of the three phase partial windings are provided in the main body of the busbar module at any of the same axial levels.

4. The phase windings of each phase are connected to the power terminals of each phase and each has n sub-windings connected in series, forming two series coil groups: a first series coil group (S1) and a second series coil group (S2). In the first and second series coil groups of the same phase, the sub-winding closest to the power terminal is designated as winding 1, and the sub-winding furthest from the power terminal is designated as winding n. In this configuration, the stator windings are arranged such that the windings 1 of the first and second series coil groups are positioned to be circumferentially continuous as sub-windings of the same phase, and the windings n of the first and second series coil groups are also positioned to be circumferentially continuous as sub-windings of the same phase. The stator unit according to claim 1, wherein the busbar module is provided such that a busbar connecting partial windings of one phase of the first series coil group and a busbar connecting partial windings of the other phase of the second series coil group are provided at the same axial level.

5. The stator unit according to claim 4, wherein the busbar module has a power terminal busbar for each phase winding of each phase, connecting the first winding of each series coil group to the power terminal, and in the same hierarchical level of the busbar module, the power terminal busbars of the same phase and the busbars connected to the first series coil group are arranged in a circumferential direction, and in the remaining circumferential area where none of those busbars are located, the busbars connected to the second series coil group of a different phase are arranged in a circumferential direction.

6. The phase windings of each phase are connected to the power terminals of each phase and each has n sub-windings connected in series as two series coil groups, a first series coil group (S1) and a second series coil group (S2), wherein the sub-winding closest to the power terminal in the first series coil group and the second series coil group of the same phase is designated as winding 1, and the sub-winding furthest from the power terminal is designated as winding n, the stator windings are arranged such that the windings 1 of the first series coil group and the second series coil group are positioned to be circumferentially continuous as sub-windings of the same phase, and the windings n of the first series coil group and the second series coil group are also positioned to be circumferentially continuous as sub-windings of the same phase, and the busbar module has a power terminal busbar for each phase winding that connects the winding 1 of each series coil group to the power terminal. The stator unit according to claim 1, wherein the power terminal busbars of each phase in the busbar module are provided at different axial levels and overlapping positions in the circumferential direction.

7. The stator unit according to claim 1, wherein the busbar has a circumferentially extending elongated portion (71) and an arm portion (72) extending radially from the elongated portion, the arm portion of each busbar is drawn out on the same side of the radial direction, the busbars are provided in the main body of the busbar module so as to be arranged in two radial rows at the same axial level, the two radially aligned busbars overlap each other only in the circumferential direction, and the arm portion of one of the two radially aligned busbars is drawn out radially using a region in the circumferential direction where the other busbar is absent.

8. The stator unit according to claim 1, wherein the busbar has a circumferentially extending elongated portion (71) and an arm portion (72) extending radially from the elongated portion, the arm portion of each busbar is drawn out on the same side of the radial direction, the busbars are provided in the main body of the busbar module so as to be arranged in two radial rows at the same axial level, and the arm portion of one of the two radially aligned busbars and the elongated portion of the other busbar intersect each other in a three-dimensional manner while being spaced apart in the axial direction.

9. The stator unit according to claim 8, wherein the arm portion of one of the two busbars arranged radially and the elongated portion of the other busbar intersect each other in a three-dimensional manner, and an insulating member (75) is interposed between the arm portion and the elongated portion.

10. The stator unit according to claim 8 or 9, wherein either the arm portion of one of the two radially aligned busbars or the elongated portion of the other busbar is bent in the axial direction, so that the arm portion and the elongated portion intersect in a three-dimensional manner, and the busbar that is bent in the axial direction among the arm portion and the elongated portion that intersect in a three-dimensional manner is bent toward the side of another layer of the main body, and the three-dimensional intersection portion that intersects in a three-dimensional manner is located in a non-existent region in the other layer where the busbar does not exist.

11. The stator unit according to claim 1, wherein the main body of the busbar module has a plurality of annular plate-shaped insulators (61 to 64) stacked in the thickness direction, each insulator is provided with a busbar housing groove (81) for housing the busbar, and the insulators are stacked in layers with the busbar housing groove in place.

Images