WO2023234044A1 - Rotary electric machine unit - Google Patents

Abstract

A rotary electric machine unit according to the present disclosure comprises a rotary electric machine, an electric power conversion device, and a first cooling part that cools the electric power conversion device and has formed therein a first cooling flow path through which refrigerant flows. The electric power conversion device has a plurality of power modules and a capacitor unit. The first cooling flow path has: an inlet flow path; a first flow path that branches from the inlet flow path and, as seen from an axial direction, is formed at a position overlapping a first group of power modules among the plurality of power modules; a second flow path that branches from the inlet flow path and, as seen from the axial direction, is formed at a position overlapping a second group of power modules among the plurality of power modules, the second group being different from the first group; and an outlet flow path. The capacitor unit is disposed so as to surround the first cooling part from the radially outer side.

Description

Rotating electric machine unit

The present disclosure relates to a rotating electric machine unit.
This application claims priority based on Japanese Patent Application No. 2022-090052 filed in Japan on June 2, 2022, the contents of which are incorporated herein.

Conventionally, a rotating electrical machine unit in which a rotating electrical machine and a power conversion device are integrated is known. In Patent Document 1, a rotating electric machine unit is provided with a cooler that cools a power conversion device. A cooling channel through which a refrigerant flows is formed in the cooler.

Japanese Patent No. 5501257

In Patent Document 1, a plurality of power modules are arranged along the flow of refrigerant flowing through a cooling channel. In the structure of Patent Document 1, the temperature of the refrigerant on the downstream side of the cooling channel is higher than the temperature of the refrigerant on the upstream side of the cooling channel, so the power module disposed on the downstream side of the cooling channel is cooling may not be possible. That is, since the temperature of the refrigerant is uneven between the upstream side and the downstream side of the cooling flow path, it is difficult to cool the plurality of power modules uniformly.

The present disclosure has been made in view of the above-mentioned circumstances, and aims to provide a rotating electric machine unit that can uniformly cool a plurality of power modules and improve cooling performance.

A rotating electrical machine unit according to the present disclosure includes a rotating electrical machine including a stator, a rotor that rotates around an axis relative to the stator, and a plurality of coils wound around the stator; A power conversion device disposed in parallel with the rotating electric machine in an axial direction along the axis of the child; a first cooling section in which a first cooling channel through which a refrigerant flows and cools the power conversion device; , the power conversion device includes a plurality of power modules each electrically connected to the plurality of coils, and a capacitor unit electrically connected to the plurality of power modules, The first cooling channel is branched from the inlet channel to which the refrigerant is supplied, and overlaps the first group of power modules among the plurality of power modules when viewed from the axial direction. a first flow path formed at a position that branches from the inlet flow path and overlaps a second group of power modules different from the first group among the plurality of power modules when viewed from the axial direction; a second flow path formed at a position, and an outlet flow path through which the refrigerant from the first flow path and the second flow path merges and the refrigerant is discharged from the first cooling section. The condenser unit is arranged to surround the first cooling section from the outside in the radial direction.

According to the present disclosure, it is possible to provide a rotating electric machine unit that can uniformly cool a plurality of power modules and improve cooling performance.

1 is a circuit diagram of a rotating electric machine unit according to Embodiment 1. FIG. 1 is a perspective view of a rotating electrical machine unit according to Embodiment 1. FIG. 1 is a perspective view of the rotating electric machine unit according to Embodiment 1, with the case removed. FIG. FIG. 4 is a plan view of FIG. 3; 5 is a sectional view taken along line AA in FIG. 4. FIG. 5 is a sectional view taken along line BB in FIG. 4. FIG. FIG. 2 is a perspective view of the rotating electric machine unit, with the case, terminal block, signal connector, and control board removed. FIG. 8 is a plan view of FIG. 7; 9 is a sectional view taken along line CC in FIG. 8. FIG. 9 is a sectional view taken along line DD in FIG. 8. FIG. 9 is a cross-sectional view taken along line EE in FIG. 8. FIG. 1 is a perspective view of a capacitor module according to Embodiment 1. FIG. FIG. 2 is a perspective view of the capacitor module according to Embodiment 1, with the storage case removed. 1 is a perspective view of a positive electrode conductor according to Embodiment 1. FIG. 1 is a perspective view of a negative electrode conductor according to Embodiment 1. FIG. FIG. 2 is a perspective view of a power module, a bus bar, a current sensor, and a resin member according to the first embodiment. 1 is a perspective view of a bus bar according to Embodiment 1. FIG. 1 is a perspective view of a rotating electric machine according to Embodiment 1. FIG. 1 is a perspective view of a rotating electric machine and a cooler according to Embodiment 1. FIG. 1 is a perspective view of a plate according to Embodiment 1. FIG. 1 is a perspective view of a plate according to Embodiment 1. FIG. FIG. 3 is a perspective view of a base and a refrigerant inlet portion according to the first embodiment. FIG. 3 is a perspective view of the inner cylinder portion according to the first embodiment. FIG. 3 is a perspective view of the inner cylinder portion according to the first embodiment. FIG. 3 is a perspective view of a housing case for a capacitor module according to a second embodiment. FIG. 3 is a cross-sectional view of a rotating electric machine unit according to a second embodiment.

Embodiment 1.
The rotating electric machine unit 1 according to the first embodiment will be described below with reference to the drawings.
FIG. 1 is a circuit diagram of the rotating electrical machine unit 1. As shown in FIG. FIG. 2 is a perspective view of the rotating electric machine unit 1. As shown in FIGS. 2 and 19, the rotating electrical machine unit 1 includes a rotating electrical machine 2, a power conversion device 3, and a cooler 4 (first cooling section). The rotating electrical machine 2, the power converter 3, and the cooler 4 are integrated. Thereby, the rotating electric machine unit 1 can be downsized.
Note that in this specification, the direction along the axis O (see FIG. 9) of the rotor 22 of the rotating electric machine 2 is referred to as the "axial direction." Further, when viewed from the axial direction, the direction intersecting the axis O of the rotor 22 is referred to as the "radial direction", and the direction in which the rotor 22 rotates around the axis O is referred to as the "circumferential direction".

First, the circuit configuration (electrical configuration) of the rotating electric machine unit 1 will be explained with reference to FIG. In this embodiment, a six-phase drive type rotating electrical machine unit will be described as an example of the rotating electrical machine unit 1. The rotating electric machine unit 1 is mounted on a vehicle, for example.

The rotating electric machine 2 includes six coils 25U1, 25V1, 25W1, 25U2, 25V2, and 25W2 corresponding to each of six phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, W2 phase). In addition, in this specification, the coils 25U1, 25V1, 25W1, 25U2, 25V2, and 25W2 are also simply referred to as the coils 25.

The power conversion device 3 includes a capacitor unit 34 and six power modules 35U1, 35V1, 35W1, 35U2, 35V2 corresponding to each of six phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, W2 phase). , 35W2. Note that in this specification, the power modules 35U1, 35V1, 35W1, 35U2, 35V2, and 35W2 are also simply referred to as the power module 35.

DC power is input to the power conversion device 3 from a DC power source E such as a battery. The power conversion device 3 converts the DC power output from the DC power supply E into AC power and supplies the AC power to the rotating electric machine 2 .

The capacitor unit 34 is a smoothing capacitor that stabilizes the voltage so that it does not fluctuate greatly in response to power fluctuations in the DC power source E or power fluctuations on the power module 35 side. The capacitor unit 34 includes a plurality of (two in this embodiment) capacitor modules 51. Each capacitor module 51 is connected between a positive power terminal and a negative power terminal of a DC power source E. Each capacitor module 51 has a plurality of capacitor elements 52 connected in parallel. Capacitor module 51 may have only one capacitor element 52.

Each power module 35 is connected between the positive power terminal and negative power terminal of the DC power source E. Each power module 35 includes a switching element SW1 and a diode D1 on the upper arm side, and a switching element SW2 and a diode D2 on the lower arm side. The switching elements SW1 and SW2 are, for example, IGBTs (Insulated Gate Bipolar Transistors) or SiC (Silicon Carbide). Switching elements SW1 and SW2 are connected in series. The connection point between switching element SW1 and switching element SW2 is electrically connected to the coil 25 of the corresponding phase. The diode D1 is connected in parallel in the opposite direction to the switching element SW1. Diode D2 is connected in parallel in the opposite direction to switching element SW2.

Next, the structure of the rotating electrical machine unit 1 will be explained.

<Rotating electrical machinery>
First, the rotating electric machine 2 will be explained with reference to FIGS. 9, 18, and the like. FIG. 18 is a perspective view of the rotating electric machine 2.

As shown in FIG. 9, the rotating electric machine 2 includes a stator 21, a rotor 22, a shaft 23, a housing 24, and a plurality of coils 25 (in this embodiment, six coils 25U1, 25V1, 25W1). , 25U2, 25V2, 25W2), first and second bearings 26a and 26b, and a resolver 27.

The stator 21 is annular. The stator 21 is provided so as to surround the outer periphery of the rotor 22. Stator 21 is fixed to housing 24.

The rotor 22 is provided inside the stator 21. The rotor 22 is rotatable around the axis O with respect to the stator 21 .

A shaft 23 is arranged at the center of the rotor 22. One axial side (lower side) of the shaft 23 is an output side that transmits the rotation of the rotor 22 to a vehicle or the like.

The housing 24 accommodates the stator 21, rotor 22, and shaft 23. The housing 24 includes a lid part 61, an inner cylinder part 62, an outer cylinder part 63, and a bottom part 64.

The lid portion 61 is a circular plate-like member. The lid part 61 is fixed to the upper end of the inner cylinder part 62. The lid portion 61 covers the stator 21 and rotor 22 from above. As shown in FIG. 18, the lid portion 61 is formed with a coil through hole 61a through which the coil end 25a of the coil 25 is inserted. The six coil through holes 61a are arranged at equal intervals (60° intervals) in the circumferential direction. A joint accommodation hole 61b is formed in the lid portion 61, in which a relay joint 47, which will be described later, is accommodated.

The inner cylinder portion 62 has a cylindrical shape. The inner cylinder portion 62 covers the stator 21 from the outside in the radial direction. The stator 21 is fixed to the inner cylinder portion 62 by, for example, shrink fitting or press fitting.
The outer cylinder portion 63 has a cylindrical shape. The outer cylinder part 63 covers the inner cylinder part 62 from the outside in the radial direction. The outer cylinder part 63 is fixed to the inner cylinder part 62 by, for example, shrink fitting or press fitting.
The inner cylinder part 62 and the outer cylinder part 63 constitute a second cooling part 65 that cools the rotating electrical machine 2 . Details of the second cooling unit 65 will be described later.

The bottom portion 64 is a circular plate-like member. The bottom portion 64 is fixed to the lower end of the outer cylinder portion 63. The bottom portion 64 covers the stator 21 and rotor 22 from below. The bottom portion 64 is provided with an attachment portion 64a for attaching the rotating electric machine unit 1 to a vehicle.

The coil 25 is wound around the stator 21. The coil 25 is wound around the stator 21 in a distributed manner, for example. As the coil 25, for example, a rectangular wire having a rectangular cross section of 0.5 to 6.0 mm on a side is used. The coil terminal 25a of the coil 25 of each phase is electrically connected to the power module 35 of the corresponding phase. As shown in FIG. 18, the six coil terminals 25a are arranged at equal intervals (60° intervals) in the circumferential direction. After the coil terminal 25a is inserted into the coil through hole 61a, it is bent radially outward, and then bent again to extend in the axial direction.

The resolver 27 detects the rotation angle of the shaft 23. As shown in FIG. 18, the resolver 27 includes a resolver stator 27a, a resolver rotor 27b, and a resolver harness 27c (signal line). The resolver stator 27a is fixed to the lid 61. The resolver rotor 27b is attached to the upper end (non-output side end) of the shaft 23.

The detection result of the resolver 27 is output to the control board 36 of the power conversion device 3, which will be described later, via the resolver harness 27c. The resolver harness 27c is pulled out from the resolver stator 27a, extends toward the control board 36, and is connected to the control board 36. The resolver harness 27c extends avoiding a portion where the power module 35 is arranged. Thereby, noise caused by the power module 35 can be prevented from being transmitted to the resolver harness 27c, and the detection accuracy of the rotation angle of the shaft 23 can be improved.

A first bearing 26a is provided at the upper end (non-output side end) of the shaft 23. The first bearing 26a is fixed to the lid 61. A second bearing 26b is provided at the lower end (output side end) of the shaft 23. The second bearing 26b is fixed to the bottom 64. The first bearing 26a and the second bearing 26b rotatably support the shaft 23.

<Power converter>
Next, the power conversion device 3 will be explained with reference to FIGS. 2 to 17.
As shown in FIGS. 2, 3, 7, etc., the power converter 3 includes a case 31, a terminal block 32 (second external connection), and a signal connector 33 (first external connection). , a capacitor unit 34, a control board 36, a plurality of power modules 35 (in this embodiment, six power modules 35U1, 35V1, 35W1, 35U2, 35V2, 35W2), and a plurality (in this embodiment, six power modules 35U1, 35V1, 35W1, 35U2, 35V2, 35W2), bus bars 37; a plurality (six in this embodiment) of current sensors 38; and a plurality (six in this embodiment) of resin members 39.

The case 31 covers electronic components such as the capacitor unit 34, the power module 35, and the control board 36 from above. This ensures insulation between these electronic components and components mounted around the rotating electrical machine unit 1, and prevents foreign matter from entering the rotating electrical machine unit 1 from outside.

The terminal block 32 is provided on the top surface of the case 31. The terminal block 32 connects the DC power supply E and the capacitor unit 34. The terminal block 32 is a second external connection part that connects the power conversion device 3 and a DC power supply E that is an external power supply. The terminal block 32 includes a positive connection terminal 32a, a negative connection terminal 32b, and a housing case 32c.

The positive side connection terminal 32a is connected to the positive power supply terminal of the DC power supply E and the positive conductor 54 of two capacitor modules 51 of the capacitor unit 34, which will be described later.
The negative electrode side connection terminal 32b is connected to the negative electrode power terminal of the DC power source E and the negative electrode conductor 55 of two capacitor modules 51 of the capacitor unit 34, which will be described later.
The housing case 32c houses the positive side connection terminal 32a and the negative side connection terminal 32b.

As shown in FIG. 3, the upper surface of the positive connection terminal 32a is exposed from the housing case 32c, and the positive power terminal of the DC power source E is connected to this upper surface. Both side surfaces in the circumferential direction of the positive electrode side connection terminal 32a are exposed from the housing case 32c, and the positive electrode conductors 54 of the two capacitor modules 51 are respectively connected to these side surfaces.
The upper surface portion of the negative electrode side connection terminal 32b is exposed from the housing case 32c, and the negative electrode power terminal of the DC power source E is connected to this upper surface portion. Both side surfaces of the negative electrode side connection terminal 32b in the circumferential direction are exposed from the housing case 32c, and the negative electrode conductors 55 of the two capacitor modules 51 are respectively connected to these side surfaces.

The signal connector 33 is provided on the top surface of the case 31. The signal connector 33 is electrically connected to the control board 36. The signal connector 33 is used to exchange various signals between the power conversion device 3 and an external control device mounted on a vehicle or the like. The signal connector 33 is a first external connection section that connects the power conversion device 3 and an external control device.

As shown in FIG. 4, when viewed from the axial direction, the side where the signal connector 33 is arranged with respect to the axis O of the rotor 22 is called the front side, and the opposite side is called the rear side. The signal connector 33 is arranged on the front side of the rotating electric machine unit 1. The terminal block 32 is arranged on the rear side of the rotating electric machine unit 1.

The capacitor unit 34 will be explained with reference to FIGS. 7, 8, and 12 to 15.
As shown in FIG. 8, the capacitor unit 34 is arranged at the outer periphery of the power converter 3. When viewed from the axial direction, the capacitor unit 34 extends in the circumferential direction. The capacitor unit 34 is fixed to the lid portion 61.

The capacitor unit 34 has two capacitor modules 51 arranged in the circumferential direction. One of the two capacitor modules 51 is provided corresponding to half of the power modules 35 (for example, power modules 35U1, 35V1, 35W1) among the six power modules 35, and the other is provided corresponding to the other half of the power modules 35 (for example, power modules 35U1, 35V1, 35W1). For example, it is provided corresponding to the power modules 35U2, 35V2, 35W2). When viewed from the axial direction, each capacitor module 51 has an arc shape extending in the circumferential direction. The two capacitor modules 51 have the same shape. A gap is formed between the ends of the two capacitor modules 51 in the circumferential direction.

As shown in FIGS. 12 and 13, the capacitor module 51 includes a plurality of capacitor elements 52, a housing case 53, a positive conductor 54, and a negative conductor 55.

The housing case 53 houses a plurality of capacitor elements 52, a portion of the positive electrode conductor 54, and a portion of the negative electrode conductor 55. In this state, each component accommodated in the accommodation case 53 is fixed by filling the inside of the accommodation case 53 with resin. In addition, in the housing case 53, the capacitor element 52 is arranged so that the positive electrode is located at the lower end and the negative electrode is located at the upper end.

A plurality of attachment parts 53a for attaching the capacitor module 51 to the lid part 61 are formed at the lower part of the housing case 53. The attachment portion 53a is a protrusion that protrudes radially outward from the outer peripheral surface of the storage case 53. A bolt hole is formed in the attachment portion 53a, and the capacitor module 51 is attached to the lid portion 61 by fastening a bolt 53b (see FIG. 8) to this bolt hole.

FIG. 14 is a perspective view of the positive electrode conductor 54. FIG. 15 is a perspective view of the negative electrode conductor 55. The positive electrode conductor 54 and the negative electrode conductor 55 are formed of plate-like members. As the material for the positive electrode conductor 54 and the negative electrode conductor 55, for example, oxygen-free copper is used. Tough pitch copper may be used as the material for the positive electrode conductor 54 and the negative electrode conductor 55 in order to reduce the cost of materials, improve availability, and the like. Further, the thickness of the positive electrode conductor 54 and the negative electrode conductor 55 is, for example, 0.5 to 2.5 mm.

The positive conductor 54 is connected to the positive side connection terminal 32a of the terminal block 32 and the positive terminal 35b of the power module 35, which will be described later. The positive electrode conductor 54 includes a plurality of (in this embodiment, three) first positive end portions 54a, a second positive end portion 54b, a plurality of third positive end portions 54c, a positive electrode side connection portion 54d, It has a plurality (in this embodiment, three) of positive electrode side cooled parts 54e.

The three first positive end portions 54a are provided corresponding to half (three) of the power modules 35, respectively. The first positive end portion 54a is connected to the positive terminal 35b of the corresponding power module 35. The three first positive end portions 54a are arranged at equal intervals (60° intervals) in the circumferential direction. The three first positive end portions 54a have the same shape. The first positive end portion 54a is pulled out from the upper part of the storage case 53. As shown in FIG. 8, the first positive end portion 54a is arranged to face the positive electrode terminal 35b of the corresponding power module 35 in the radial direction.

The second positive end portion 54b is connected to the positive side connection terminal 32a of the terminal block 32. The second positive end portion 54b is pulled out from the upper part of the storage case 53. As shown in FIG. 3, the second positive end portion 54b is arranged to face the side surface of the positive connection terminal 32a. A bolt hole is formed at the tip of the second positive end portion 54b, and by fastening a bolt 54f to this bolt hole, the second positive end portion 54b is fixed to the side surface of the positive connection terminal 32a.

The plurality of third positive end portions 54c are provided corresponding to the plurality of capacitor elements 52, respectively. The third positive end portion 54c is fixed to the lower end portion of the capacitor element 52, for example, by soldering. Thereby, the third positive end portion 54c is connected to the positive electrode provided at the lower end portion of the capacitor element 52. The third positive end portion 54c is housed in the housing case 53.

The positive electrode side connecting portion 54d electrically connects the first positive end portion 54a, the second positive end portion 54b, and the third positive end portion 54c. The positive electrode side connection portion 54d is housed in the housing case 53.

The positive electrode side connection portion 54d includes a plurality of first straight portions 54d1, a plurality of first bent portions 54d2, and a first connection end portion 54d3. The plurality of first straight portions 54d1 are formed, for example, by bending a plate-like member, and are formed to extend generally in the circumferential direction as a whole. The plurality of first bent portions 54d2 connect the plurality of first straight portions 54d1. The first connecting end portion 54d3 is connected to a first straight portion 54d1 disposed on one side in the circumferential direction, and is bent toward the outside in the radial direction with respect to the first straight portion 54d1.

The positive electrode conductor 54 is formed by joining a separate first positive end portion 54a, second positive end portion 54b, and third positive end portion 54c to a positive electrode side connection portion 54d. The first positive end portion 54a is joined to the upper end portion of the first straight portion 54d1. The second positive end portion 54b is joined to the upper end portion of the first connection end portion 54d3. The third positive end portion 54c is joined to the lower end portion of the first straight portion 54d1.

The positive electrode side cooled part 54e is provided so as to extend downward from the first positive end part 54a. The positive side cooled portion 54e is integrally formed with the first positive end portion 54a. The positive side cooled portion 54e may be formed separately from the first positive end portion 54a.
As shown in FIG. 12, the positive electrode side cooled portion 54e is arranged inside the capacitor module 51 in the radial direction. The positive electrode side cooled part 54e is arranged outside the housing case 53. The positive electrode side cooled part 54e is thermally connected to the cooler 4.

The negative electrode conductor 55 is connected to the negative electrode side connection terminal 32b of the terminal block 32 and the negative electrode terminal 35c of the power module 35, which will be described later. The negative electrode conductor 55 includes a plurality of (in this embodiment, three) first negative end portions 55a, a second negative end portion 55b, a plurality of third negative end portions 55c, a negative electrode side connection portion 55d, It has a plurality (in this embodiment, three) of negative electrode side cooled parts 55e.

The three first negative end portions 55a are provided corresponding to half (three) of the power modules 35, respectively. The first negative end portion 55a is connected to the negative electrode terminal 35c of the corresponding power module 35. The three first negative end portions 55a are arranged at equal intervals (60° intervals) in the circumferential direction. The three first negative end portions 55a have the same shape. The first negative end portion 55a is pulled out from the upper part of the storage case 53. As shown in FIG. 8, the first negative end portion 55a is arranged to face the negative electrode terminal 35c of the corresponding power module 35 in the radial direction.

The second negative end portion 55b is connected to the negative connection terminal 32b of the terminal block 32. The second negative end portion 55b is pulled out from the upper part of the storage case 53. As shown in FIG. 3, the second negative end portion 55b is arranged to face the side surface of the negative connection terminal 32b. A bolt hole is formed at the tip of the second negative end portion 55b, and by fastening a bolt 55f to this bolt hole, the second negative end portion 55b is fixed to the side surface of the negative electrode side connection terminal 32b.

The plurality of third negative end portions 55c are provided corresponding to the plurality of capacitor elements 52, respectively. The third negative end portion 55c is fixed to the upper end portion of the capacitor element 52, for example, by soldering. Thereby, the third negative end portion 55c is connected to the negative electrode provided at the upper end portion of the capacitor element 52. The third negative end portion 55c is housed in the housing case 53.

The negative electrode side connection portion 55d electrically connects the first negative end portion 55a, the second negative end portion 55b, and the third negative end portion 55c. The negative electrode side connection portion 55d is housed in the housing case 53.

The negative electrode side connection portion 55d includes a plurality of second straight portions 55d1, a plurality of second bent portions 55d2, and a second connection end portion 55d3. The plurality of second straight portions 55d1 are formed, for example, by bending a plate-like member, and are formed to extend generally in the circumferential direction as a whole. The plurality of second bent portions 55d2 connect the plurality of second straight portions 55d1. The second connecting end portion 55d3 is connected to a second straight portion 55d1 disposed on one side in the circumferential direction, and is bent toward the outside in the radial direction with respect to the second straight portion 55d1.

The negative electrode conductor 55 is formed by joining a first negative end portion 55a, a second negative end portion 55b, and a third negative end portion 55c, which are separate bodies, to a negative electrode side connection portion 55d. The first negative end portion 55a is joined to the upper end portion of the second straight portion 55d1. The second negative end portion 55b is joined to the upper end portion of the second connection end portion 55d3. The third negative end portion 55c is joined to the upper end portion of the second straight portion 55d1.

The negative electrode side cooled part 55e is provided so as to extend downward from the first negative end part 55a. The negative electrode side cooled portion 55e is integrally formed with the first negative end portion 55a. The negative electrode side cooled part 55e may be formed separately from the first negative end part 55a.
As shown in FIG. 12, the negative electrode side cooled portion 55e is arranged inside the capacitor module 51 in the radial direction. The negative electrode side cooled part 55e is arranged outside the housing case 53. The negative electrode side cooled part 55e is thermally connected to the cooler 4.

The power module 35 will be described with reference to FIGS. 7, 8, and 16.
As shown in FIGS. 7 and 8, six power modules 35 are arranged at the center of the power conversion device 3. As shown in FIGS. When viewed from the axial direction, the six power modules 35 are surrounded by the capacitor unit 34 from the outside in the radial direction. The six power modules 35 are arranged at equal intervals (60° intervals) in the circumferential direction. Power modules 35U1, 35V1, 35W1, 35U2, 35V2, and 35W2 are arranged in this order in the circumferential direction. Therefore, power modules 35 of the same phase (for example, power modules 35U1 and 35U2 of U1 phase and U2 phase) are arranged to face each other in the radial direction.

As shown in FIG. 16, each power module 35 includes a main body 35a, a positive terminal 35b, a negative terminal 35c, an output terminal 35d, a signal terminal 35e on the upper arm side, and a signal terminal 35f on the lower arm side. and has. The power module 35 is fixed to a plate 41 of the cooler 4, which will be described later.

The main body portion 35a has a substantially rectangular shape when viewed from the axial direction. The main body portion 35a includes a switching element SW1 and a diode D1 on the upper arm side, and a switching element SW2 and a diode D2 on the lower arm side. A projection 35a1 for fixing the signal terminal 35e on the upper arm side is provided at a corner of the main body 35a.

The positive terminal 35b, the negative terminal 35c, the output terminal 35d, the signal terminal 35e on the upper arm side, and the signal terminal 35f on the lower arm side are plate-shaped members.
For example, oxygen-free copper is used as the material for the positive terminal 35b, the negative terminal 35c, the output terminal 35d, the signal terminal 35e on the upper arm side, and the signal terminal 35f on the lower arm side. Tough pitch copper is used as the material for the positive terminal 35b, negative terminal 35c, output terminal 35d, upper arm signal terminal 35e, and lower arm signal terminal 35f in order to reduce material costs and improve availability. It's okay to be hit. Further, the thickness of the positive terminal 35b, the negative terminal 35c, the output terminal 35d, the signal terminal 35e on the upper arm side, and the signal terminal 35f on the lower arm side is, for example, 0.5 to 1.5 mm.

As shown in FIG. 8, the positive electrode terminal 35b is arranged to face the first positive end portion 54a. The positive terminal 35b is directly connected to the first positive end 54a. Note that being directly connected means that the positive electrode terminal 35b and the first positive end portion 54a are connected by contacting each other without using a wire or the like. For example, resistance welding, ultrasonic welding, TIG welding, and laser welding are used to connect the positive electrode terminal 35b and the first positive end portion 54a. Seen from the axial direction, the connection portion between the first positive end portion 54a and the positive electrode terminal 35b is located between the housing case 53 and the main body portion 35a.

The negative electrode terminal 35c is arranged to face the first negative end portion 55a. The negative terminal 35c is directly connected to the first negative end 55a. Note that being directly connected means that the negative electrode terminal 35c and the first negative end portion 55a are connected by contacting each other without using a wire or the like. For example, resistance welding, ultrasonic bonding, TIG welding, and laser welding are used to connect the negative electrode terminal 35c and the first negative end portion 55a. When viewed from the axial direction, the connection portion between the first negative end portion 55a and the negative electrode terminal 35c is located between the housing case 53 and the main body portion 35a.

In the present embodiment, the length of the path from the positive conductor 54 of the capacitor unit 34 to the negative conductor 55 of the capacitor unit 34 via the positive terminal 35b and the negative terminal 35c of the power module 35 is the same as that for all power modules 35. The capacitor unit 34 and the power module 35 are provided so that they are substantially the same. That is, the length of the connection path between the capacitor unit 34 and the power module 35 is substantially the same for all the power modules 35. Here, the term "the lengths of the paths are approximately the same" means that the lengths of the paths are approximately the same between each power module 35 with respect to the entire length of the path from the positive electrode conductor 54 to the negative electrode conductor 55 via the positive electrode terminal 35b and the negative electrode terminal 35c. means that the difference in the above path length of is within the range of ±5%. This makes it possible to equalize the surge voltages generated in each power module 35. Therefore, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1.

Note that in the present disclosure, the lengths of the connection paths between the capacitor unit 34 and the power module 35 may be approximately the same for at least two power modules 35. Even in this case, the surge voltages generated in these two power modules 35 can be made equal. Therefore, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1.

Further, the positive electrode terminal 35b is directly connected to the first positive end portion 54a, and the negative electrode terminal 35c is directly connected to the first negative end portion 55a. That is, the capacitor unit 34 and the power module 35 are connected through the shortest path. Thereby, the inductance of the connection path between the capacitor unit 34 and the power module 35 can be reduced, and the surge voltage generated in the power module 35 can be suppressed. Therefore, it becomes possible to input a larger amount of current to the power module 35, and it becomes possible to further increase the output of the rotating electric machine unit 1.

The output terminal 35d is connected to the coil terminal 25a of the coil 25 via the bus bar 37.
In all the power modules 35, the output terminals 35d are arranged so as to be symmetrical with respect to an imaginary line passing through the axis O and the intermediate position of the gap between the positive electrode terminal 35b and the negative electrode terminal 35c. That is, the output terminal 35d is arranged so that the center position of the output terminal 35d coincides with the intermediate position of the gap between the positive electrode terminal 35b and the negative electrode terminal 35c when viewed from the radial direction. Thereby, in all the power modules 35, the wiring resistance of the connection path from the positive electrode conductor 54 to the coil terminal 25a and from the negative electrode conductor 55 to the coil terminal 25a becomes uniform. Therefore, it is possible to prevent the current flowing through the power modules 35 from being uneven among the plurality of power modules 35.

The signal terminal 35e on the upper arm side is connected to the switching element SW1 and the diode D1 on the upper arm side. The signal terminal 35f on the lower arm side is connected to the switching element SW2 and the diode D2 on the lower arm side. The signal terminal 35e on the upper arm side and the signal terminal 35f on the lower arm side are connected to the control board 36. As shown in FIG. 3, the signal terminal 35e on the upper arm side and the signal terminal 35f on the lower arm side are directly attached to the control board 36.

The bus bar 37 will be described with reference to FIGS. 8, 16, and 17.
Each bus bar 37 connects the power module 35 and coil 25 of the corresponding phase. As shown in FIG. 8, the bus bar 37 is arranged between the power modules 35 adjacent to each other in the circumferential direction.

As shown in FIG. 17, the bus bar 37 is a plate-like member. As the material for the bus bar 37, for example, oxygen-free copper is used. Tough pitch copper may be used as the material for the bus bar 37 in order to reduce the cost and improve availability of the material. The thickness of the bus bar 37 is, for example, 0.5 to 2.5 mm.

The bus bar 37 has a first terminal 37a connected to the output terminal 35d and a second terminal 37b connected to the coil terminal 25a.

The first terminal 37a is provided at one end of the bus bar 37. As shown in FIG. 16, the first terminal 37a is arranged to face the output terminal 35d. The first terminal 37a is directly connected to the output terminal 35d. Note that being directly connected means that the first terminal 37a and the output terminal 35d are connected to each other by contacting each other without using a wire or the like. For example, resistance welding, ultrasonic welding, TIG welding, and laser welding are used to connect the first terminal 37a and the output terminal 35d. As shown in FIG. 8, when viewed from the axial direction, the connecting portion between the first terminal 37a and the output terminal 35d is located on the radially inner side of the main body portion 35a.

The second terminal 37b is provided at the other end of the bus bar 37. As shown in FIG. 16, the second terminal 37b is arranged to face the coil terminal 25a. The second terminal 37b is directly connected to the coil terminal 25a. Note that being directly connected means that the second terminal 37b and the coil terminal 25a are connected to each other in contact with each other without using a wire or the like. For example, resistance welding, ultrasonic welding, TIG welding, and laser welding are used to connect the second terminal 37b and the coil terminal 25a. As shown in FIG. 8, when viewed from the axial direction, the connection portion between the second terminal 37b and the coil terminal 25a is located radially outward from the main body portion 35a.

A notch 37c is formed in the bus bar 37. The cutout portion 37c is formed by cutting out a region of the bus bar 37 that faces the signal terminal 35f on the lower arm side of the power module 35. The cutout portion 37c is provided to form a gap between the bus bar 37 and the signal terminal 35f on the lower arm side. For example, the cutout portion 37c is formed so that the bus bar 37 and the signal terminal 35f on the lower arm side are separated by 2.0 to 5.0 mm. Thereby, insulation between the bus bar 37 and the signal terminal 35f on the lower arm side can be ensured.

A fixing through hole 37d is formed in the bus bar 37. As shown in FIG. 16, a fixing column 41g attached to the plate 41 is inserted through the fixing through hole 37d.

Each bus bar 37 is provided with a current sensor 38 . The bus bar 37 is inserted into the inner space of the core of the current sensor 38. Current sensor 38 detects the current flowing through bus bar 37. The current sensor 38 has a signal terminal 38a connected to the control board 36.
The detection result of the current sensor 38 is output to the control board 36 from the signal terminal 38a. As shown in FIG. 3, the signal terminal 38a is directly attached to the control board 36. This improves noise resistance and improves the detection accuracy of the current value of the bus bar 37 by the current sensor 38.

As shown in FIG. 16, the bus bar 37 and current sensor 38 are covered with a resin member 39. Note that the signal terminal 38a is exposed from the resin member 39. The resin member 39 integrally holds the bus bar 37 and the current sensor 38. As a material for the resin member 39, for example, polyphenylene sulfide (PPS) is used. The resin member 39 is fixed to the plate 41 together with the control board 36 by bolts 41f3 (see FIG. 4).

The control board 36 will be explained with reference to FIGS. 3 and 4.
The control board 36 has a polygonal shape. The control board 36 is arranged at the center of the power conversion device 3. As shown in FIG. 4, when viewed from the axial direction, the control board 36 is surrounded by the capacitor unit 34 from the outside in the radial direction. The control board 36 is fixed to the plate 41 with bolts 41f1 and 41f3.

A signal terminal 35e on the upper arm side, a signal terminal 35f on the lower arm side, and a signal terminal 38a are directly connected to the control board 36. The signal connector 33 is connected to the control board 36 via a signal connector plug. A harness insertion hole 36a is formed in the center of the control board 36, into which the resolver harness 27c is inserted. The detection results of the resolver 27 are input to the control board 36 via the resolver harness 27c. The control board 36 controls the power module 35 based on control commands input from an external control device mounted on a vehicle or the like.

<Cooler>
The cooler 4 will be explained with reference to FIGS. 5, 6, 9, 11, 19 to 21, etc.
Cooler 4 cools power converter 3 . As shown in FIG. 5, the cooler 4 is arranged inside the condenser module 51 (condenser unit 34) in the radial direction. The cooler 4 is fixed to the lid part 61.
FIG. 19 is a perspective view of the cooler 4 and the rotating electric machine 2. As shown in FIG. 19, the cooler 4 includes a plate 41, a base 42, a refrigerant inlet 43, a first heat radiating member 44 (busbar heat radiating member), and a second heat radiating member 45 (condenser heat radiating member). , has.

20A and 20B are perspective views of the plate 41. As shown in FIGS. 20A and 20B, the plate 41 is a substantially polygonal plate member. For example, the material of the plate 41 is aluminum. The material of the plate 41 may be changed as appropriate. The power module 35 is attached to the first surface 41a of the plate 41. The power module 35 is fixed to the first surface 41a of the plate 41, for example, by soldering. Power module 35 is thermally connected to plate 41.

As shown in FIG. 20A, the first surface 41a of the plate 41 is provided with a first mounting hole 41h1, a second mounting hole 41h2, and a third mounting hole 41h3.

A fixing column 41g (see FIG. 8) for fixing the control board 36 to the plate 41 is attached to the first attachment hole 41h1. The upper end of the fixed column 41g is brought into contact with the lower surface of the control board 36. In this state, the control board 36 is fixed to the plate 41 by fixing the control board 36 and the fixing column 41g with bolts 41f1 (see FIG. 4). Further, as shown in FIG. 16, a fixing through hole 37d formed in the bus bar 37 is inserted into the fixing column 41g, thereby fixing the bus bar 37 to the plate 41.

A bolt 41f2 (see FIG. 8) for fixing the resin member 39 to the plate 41 is attached to the second attachment hole 41h2.

A bolt 41f3 (see FIG. 4) for fixing the control board 36 and the resin member 39 to the plate 41 is attached to the third attachment hole 41h3. The upper end of the resin member 39 is brought into contact with the lower surface of the control board 36 . In this state, the control board 36 and the resin member 39 are fixed to the plate 41 by fastening the control board 36, the resin member 39, and the plate 41 with bolts 41f3.

As shown in FIG. 20B, the second surface 41b of the plate 41 is provided with radiation fins 41c. As shown in FIG. 11, the radiation fins 41c are arranged at a position overlapping the power module 35 in the axial direction. The second surface 41b of the plate 41 is fixed to the base 42.

A harness through hole 41d (insertion hole) through which the resolver harness 27c is inserted is formed in the plate 41. A coil groove 41e in which the coil end 25a is arranged is formed on the outer peripheral surface of the plate 41. Six coil grooves 41e are arranged at equal intervals (60° intervals) in the circumferential direction.

As shown in FIG. 19, a first heat radiating member 44 is provided on the first surface 41a of the plate 41. The first heat radiating member 44 has a hexagonal shape. As shown in FIG. 11, the first heat radiating member 44 is arranged between the plate 41 and the bus bar 37. Bus bar 37 is thermally connected to plate 41 via first heat radiating member 44 .

FIG. 21 is a perspective view of the base 42 and the refrigerant inlet section 43. As shown in FIG. 21, the base 42 has a substantially polygonal shape having a first surface 42a, a second surface, and a plurality of side surfaces. For example, the material of the base 42 is aluminum. The material of the base 42 may be changed as appropriate. As shown in FIG. 11, the base 42 is surrounded by the capacitor module 51 (capacitor unit 34) from the outside in the radial direction. A side surface of the base 42 faces the capacitor module 51 in the radial direction.
A plate 41 is fixed to the first surface 42a of the base 42. The second surface of the base 42 is fixed to the lid part 61.

A harness through hole 42b (insertion hole) through which the resolver harness 27c is inserted is formed in the center of the base 42. A coil groove portion 42c extending in the axial direction is formed on the side surface of the base 42. As shown in FIG. 19, the coil terminal 25a is arranged in the coil groove 42c. Six coil grooves 42c are formed at equal intervals (60° intervals) in the circumferential direction. The coil groove portion 42c is filled with a filler 49 having thermal conductivity. The coil end 25a is fixed to the coil groove 42c by a filler 49. The coil terminal 25a is thermally connected to the base 42 via the filler 49. The coil 25 can be cooled by releasing heat generated at the coil terminal 25a to the base 42 via the filler 49.

A condenser cooling section 42e for cooling the condenser module 51 is provided on the side surface of the base 42. As shown in FIG. 19, a second heat radiating member 45 is provided in the condenser cooling section 42e. The second heat radiating member 45 has a rectangular shape.

As shown in FIG. 6, the second heat radiating member 45 is provided so as to face the positive side cooled portion 54e of the positive electrode conductor 54 and the negative side cooled portion 55e of the negative electrode conductor 55 in the radial direction. The positive side cooled part 54e and the negative side cooled part 55e are in contact with the second heat radiating member 45, and are thermally connected to the capacitor cooling part 42e via the second heat radiating member 45.

Returning to FIG. 19, the refrigerant inlet section 43 is attached to the side surface of the base 42. The refrigerant inlet portion 43 is provided to protrude radially outward from the base 42 . The refrigerant inlet portion 43 is formed integrally with the base 42. A flow path through which a refrigerant flows is formed inside the refrigerant inlet portion 43 . The refrigerant inlet portion 43 is connected to a first joint 46 to which refrigerant is supplied from the outside. The refrigerant inlet portion 43 and the first joint 46 are arranged on the front side of the rotating electrical machine unit 1.

A first cooling channel through which a refrigerant flows is formed in the cooler 4. For example, water (cooling water) is used as the refrigerant. As shown in FIG. 21, the first cooling channel includes an inlet channel P1, a first channel P2, a second channel P3, and an outlet channel P4. Refrigerant is supplied from the first joint 46 to the inlet flow path P1. The first flow path P2 and the second flow path P3 are branched from the inlet flow path P1. The first flow path P2 is formed at a position overlapping half of the six power modules 35 (specifically, the power modules 35U1, 35V1, and 35W1) when viewed from the axial direction. The first flow path P2 extends from the inlet flow path P1 to one side in the circumferential direction. The second flow path P3 is formed at a position overlapping the other half of the six power modules 35 (specifically, the power modules 35U2, 35V2, and 35W2) when viewed from the axial direction. The second flow path P3 extends from the inlet flow path P1 to the other side in the circumferential direction. The refrigerant from the first flow path P2 and the second flow path P3 join together in the outlet flow path P4. The outlet flow path P4 communicates with a second cooling flow path formed inside the second cooling section 65.

The base 42 is provided with a refrigerant supply port 42f, an annular groove 42g, and a refrigerant discharge port 42h.

The refrigerant supply port 42f is a hole that penetrates the peripheral wall of the base 42 in the radial direction. A refrigerant inlet portion 43 is connected to one end of the refrigerant supply port 42f. The other end of the refrigerant supply port 42f is connected to the annular groove 42g. The refrigerant inlet portion 43 and the refrigerant supply port 42f are used as the inlet flow path P1.

The refrigerant discharge port 42h is a hole that penetrates the peripheral wall of the base 42 in the radial direction. The refrigerant discharge port 42h is arranged on the opposite side in the circumferential direction to the refrigerant supply port 42f. One end of the refrigerant outlet 42h is connected to the annular groove 42g. The other end of the refrigerant discharge port 42h is connected to the relay joint 47. The relay joint 47 connects the refrigerant discharge port 42h and an opening 62c of the inner cylinder portion 62, which will be described later. The refrigerant discharge port 42h and the relay joint 47 are used as the outlet flow path P4.

As shown in FIG. 8, the refrigerant inlet portion 43 is arranged in the front gap of the two gaps between the ends of the capacitor module 51 in the circumferential direction. The refrigerant discharge port 42h and the relay joint 47 are arranged in the rear gap of the two gaps between the ends of the capacitor module 51 in the circumferential direction. That is, at least a portion of the inlet flow path P1 and at least a portion of the outlet flow path P4 are arranged between the ends of the capacitor module 51 in the circumferential direction. The outlet flow path P4 is arranged on the opposite side of the inlet flow path P1 in the radial direction with the axis O interposed therebetween.

The annular groove 42g is formed on the first surface 42a of the base 42. The annular groove 42g extends in the circumferential direction and is annular when viewed from the axial direction. The annular groove portion 42g is formed avoiding the harness through hole 42b. The refrigerant supply port 42f and the refrigerant discharge port 42h open on the radially outer side surface of the annular groove portion 42g.

The annular groove portion 42g includes a first groove portion 42g1 which is a portion on one side sandwiched between the refrigerant supply port 42f and the refrigerant discharge port 42h, and a first groove portion 42g1 which is a portion on the other side sandwiched between the refrigerant supply port 42f and the refrigerant discharge port 42h. 2 groove portions 42g2. The first groove portion 42g1 is provided below half of the six power modules 35 (specifically, the power modules 35U1, 35V1, and 35W1). The second groove portion 42g2 is provided below the other half of the six power modules 35 (specifically, the power modules 35U2, 35V2, and 35W2).

The first groove portion 42g1 and the second surface 41b of the plate 41 form a first flow path P2. The second groove portion 42g2 and the second surface 41b of the plate 41 form a second flow path P3. As shown in FIG. 11, the radiation fins 41c are arranged inside the annular groove 42g (ie, the first flow path P2 or the second flow path P3).

The refrigerant supplied from the first joint 46 passes through the inlet flow path P1 and is branched into a first flow path P2 and a second flow path P3. Heat generated in the power modules 35U1, 35V1, and 35W1 is exchanged with the refrigerant flowing through the first flow path P2 via the radiation fins 41c. Thereby, power modules 35U1, 35V1, and 35W1 are cooled. Heat generated in the power modules 35U2, 35V2, and 35W2 is exchanged with the refrigerant flowing through the second flow path P3 via the radiation fins 41c. Thereby, power modules 35U2, 35V2, and 35W2 are cooled.

The positive side cooled part 54e and the negative side cooled part 55e of the capacitor module 51 are thermally connected to the capacitor cooling part 42e via the second heat radiating member 45. The heat generated in the capacitor module 51 (capacitor element 52) is transmitted to the positive side cooled part 54e and the negative side cooled part 55e, and is transferred to the first flow path via the capacitor cooling part 42e and the second heat radiating member 45. Heat is exchanged with the refrigerant flowing through P2 and the second flow path P3. Thereby, the capacitor module 51 is cooled.

The bus bar 37 is thermally connected to the plate 41 via the first heat radiating member 44. The heat generated in the bus bar 37 is exchanged with the refrigerant flowing through the first flow path P2 and the second flow path P3 via the first heat radiating member 44 and the plate 41. Thereby, the bus bar 37 is cooled.

Thereafter, the refrigerant from the first flow path P2 and the second flow path P3 join together at the outlet flow path P4 and are discharged toward the second cooling section 65.

<Second cooling section>
The second cooling section 65 will be described with reference to FIGS. 9 and 22.
As shown in FIG. 9, the inner cylinder part 62 and the outer cylinder part 63 constitute a second cooling part 65. A second cooling channel through which a refrigerant flows is formed in the second cooling section 65 . The second cooling flow path is formed between the outer peripheral surface of the inner cylinder part 62 and the inner peripheral surface of the outer cylinder part 63.

22A and 22B are perspective views of the inner cylinder portion 62. As shown in FIGS. 22A and 22B, the inner cylinder portion 62 includes a cylindrical main body portion 62a and a flange portion 62b that protrudes radially outward from the upper end of the main body portion 62a. An opening 62c is formed in the flange portion 62b. As shown in FIG. 9, the refrigerant discharge port 42h and the opening 62c are connected by a relay joint 47.

The second cooling channel includes a communication channel P5, a third channel P6, a fourth channel P7, and a discharge channel P8. The communication channel P5 communicates with the outlet channel P4. The third flow path P6 and the fourth flow path P7 are branched from the communication flow path P5. The third flow path P6 extends from the communication flow path P5 to one side in the circumferential direction. The fourth flow path P7 extends from the communication flow path P5 to the other side in the circumferential direction. The refrigerant from the third flow path P6 and the fourth flow path P7 join together in the discharge flow path P8. The refrigerant is discharged to the outside from the discharge passage P8.

A first groove 62d, a second groove 62e, a third groove 62f, and a fourth groove 62g are formed on the outer peripheral surface of the main body 62a.

The first groove portion 62d is formed below the opening portion 62c. The first groove portion 62d extends in the axial direction. The upper end of the first groove portion 62d communicates with the opening portion 62c. The lower end of the first groove portion 62d is closed. A communication channel P5 is formed by the inner circumferential surface of the outer cylinder portion 63 and the first groove portion 62d.

The second groove portion 62e is formed on the opposite side in the circumferential direction to the first groove portion 62d. The second groove portion 62e extends in the axial direction. The upper and lower ends of the second groove portion 62e are closed. The second groove portion 62e and the inner circumferential surface of the outer cylinder portion 63 form a discharge flow path P8.

The third groove portion 62f is connected to the first groove portion 62d and the second groove portion 62e. The third groove portion 62f extends from the first groove portion 62d to the second groove portion 62e on one side in the circumferential direction. A plurality of third groove portions 62f are formed at intervals in the axial direction. The third groove portion 62f and the inner circumferential surface of the outer cylinder portion 63 form a third flow path P6.

The fourth groove 62g is connected to the first groove 62d and the second groove 62e. The fourth groove 62g extends from the first groove 62d to the second groove 62e on the other side in the circumferential direction. A plurality of fourth groove portions 62g are formed at intervals in the axial direction. The fourth groove portion 62g and the inner circumferential surface of the outer cylinder portion 63 form a fourth flow path P7.

As shown in FIG. 9, an opening 63a that radially penetrates the peripheral wall of the outer cylinder 63 is formed at the lower end of the outer cylinder 63. The opening 63a communicates with the second groove 62e. The opening 63a is connected to the second joint 48 that discharges the refrigerant to the outside. Note that the second joint 48 is arranged on the front side of the rotating electrical machine unit 1.

The refrigerant discharged from the refrigerant outlet 42h of the cooler 4 flows into the communication passage P5 via the relay joint 47 and the opening 62c. The refrigerant flows through the communication flow path P5 from the opening 62c axially downward (that is, toward the output side), and is branched into the third flow path P6 and the fourth flow path P7. The refrigerant flowing through the third flow path P6 cools one half of the rotating electric machine 2 on one side in the circumferential direction. The refrigerant flowing through the fourth flow path P7 cools the other half of the rotating electric machine 2 in the circumferential direction. Since the plurality of third flow paths P6 and fourth flow paths P7 are provided at intervals in the axial direction, the cooling efficiency of the rotating electric machine 2 by the second cooling section 65 is improved. Thereafter, the refrigerant from the third flow path P6 and the fourth flow path P7 join together in the discharge flow path P8, flow downward through the discharge flow path P8, and are discharged to the outside via the opening 63a and the second joint 48. be done.

As described above, the rotating electrical machine unit 1 includes the rotating electrical machine 2, the power converter 3, and the cooler 4 in which the first cooling channel through which the refrigerant flows is formed and cools the power converter 3. . Power conversion device 3 includes a plurality of power modules 35 and a capacitor unit 34. The first cooling flow path branches from the inlet flow path P1 to which refrigerant is supplied, and when viewed from the axial direction, the first cooling flow path is connected to the first group of power modules 35 among the plurality of power modules 35. A first flow path P2 formed at an overlapping position branches from the inlet flow path P1, and when viewed from the axial direction, a second group of power modules 35 different from the first group among the plurality of power modules 35. It has a second flow path P3 formed at an overlapping position, and an outlet flow path P4 where the refrigerant from the first flow path P2 and the second flow path P3 join together and the refrigerant is discharged from the cooler 4. The condenser unit 34 is arranged to surround the cooler 4 from the outside in the radial direction.
The power conversion device 3 can be cooled by the cooler 4 . Further, the refrigerant is distributed in a branched manner into a first flow path P2 and a second flow path P3. Therefore, compared to the case where a plurality of power modules 35 are arranged on one cooling channel without branching the cooling channel, the temperature of the refrigerant is uneven between the upstream side and the downstream side of the cooling channel. can be suppressed. Therefore, the plurality of power modules 35 can be uniformly cooled, and the cooling performance of the rotating electric machine unit 1 can be improved. Moreover, as a result, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1. Furthermore, since the capacitor unit 34 is arranged to surround the cooler 4 from the outside in the radial direction, the rotating electric machine unit 1 can be made smaller in the axial direction than, for example, when the capacitor unit is arranged above the cooler. can do.

Further, the plurality of power modules 35 are arranged in the circumferential direction. The first flow path P2 extends from the inlet flow path P1 to one side in the circumferential direction, and the second flow path P3 extends from the inlet flow path P1 to the other side in the circumferential direction.
Thereby, the plurality of power modules 35 can be cooled more uniformly and efficiently.

Further, the rotating electric machine unit 1 further includes a second cooling section 65 in which a second cooling channel through which a refrigerant flows is formed and cools the rotating electric machine 2. The second cooling channel includes a communication channel P5 that communicates with the outlet channel P4, a third channel P6 that branches from the communication channel P5 and extends from the communication channel P5 to one side in the circumferential direction, and a communication channel P6 that is branched from the communication channel P5 and extends from the communication channel P5 to one side in the circumferential direction. A fourth flow path P7 that branches from the path P5 and extends from the communication flow path P5 to the other side in the circumferential direction, and the refrigerants from the third flow path P6 and the fourth flow path P7 join together, and the second cooling section 65 and a discharge flow path P8 through which the refrigerant is discharged.
Since the first cooling channel of the cooler 4 and the second cooling channel of the second cooling section 65 communicate within the rotating electrical machine unit 1, the rotating electrical machine unit 1 can be downsized. Furthermore, the refrigerant flowing through the third flow path P6 cools one half of the rotating electrical machine 2 in the circumferential direction, and the refrigerant flowing through the fourth flow path P7 cools the other half of the rotating electrical machine 2 in the circumferential direction. Since the cooling efficiency of the rotating electrical machine 2 by the second cooling unit 65 is improved.

Moreover, the cooler 4 has a plurality of heat radiation fins 41c arranged in the first flow path P2 or the second flow path P3. When viewed from the axial direction, the plurality of radiation fins 41c are arranged at positions overlapping with the plurality of power modules 35.
This improves the cooling efficiency of the power module 35 by the cooler 4. As a result, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1.

Further, the capacitor unit 34 includes a positive conductor 54 and a negative conductor 55. The positive conductor 54 has a positive cooled portion 54e that is disposed radially inside the capacitor unit 34. The negative electrode conductor 55 has a negative electrode side cooled portion 55e that is arranged radially inside the capacitor unit 34. The cooler 4 has a condenser cooling part 42e that is arranged on the outside of the cooler 4 in the radial direction and is thermally connected to the positive cooled part 54e and the negative cooled part 55e.
The capacitor unit 34 includes a positive cooled part 54e and a negative cooled part 55e, which are arranged inside the capacitor unit 34 in the radial direction and are thermally connected to the capacitor cooling part 42e. Thereby, the condenser unit 34 can be cooled from the inside in the radial direction. Furthermore, compared to, for example, the case where the condenser unit is cooled from the upper side in the axial direction, it is possible to provide a larger area for cooling the condenser unit 34. As a result, the cooling performance of the condenser unit 34 by the cooler 4 can be improved, and the output of the rotating electric machine unit 1 can be increased.
Furthermore, when the positive electrode conductor 54 and the negative electrode conductor 55 are made of copper having high thermal conductivity, the cooling performance of the capacitor unit 34 is further improved, and it becomes possible to increase the output of the rotating electric machine unit 1.
In addition, since the capacitor unit 34 is cooled using the positive side cooled part 54e and the negative side cooled part 55e, which are not current flow paths, the inductance of the connection path between the capacitor unit 34 and the power module 35 does not increase. , surge voltage generated in the power module 35 can be suppressed. Therefore, it becomes possible to input a larger amount of current to the power module 35, and it becomes possible to further increase the output of the rotating electric machine unit 1.

Furthermore, the cooler 4 includes a second heat radiating member 45 provided between the positive side cooled part 54e, the negative side cooled part 55e, and the capacitor cooling part 42e.
This improves the cooling efficiency of the condenser unit 34 by the cooler 4.

Further, the positive electrode conductor 54 has a plurality of positive electrode side cooled parts 54e, the negative electrode conductor 55 has a plurality of negative electrode side cooled parts 55e, and the cooler 4 has a plurality of capacitor cooling parts 42e.
This further improves the cooling performance of the condenser unit 34 by the cooler 4.

Further, the capacitor unit 34 includes a plurality of capacitor modules 51 arranged in the circumferential direction.
As a result, the molds and the like for molding each member of the capacitor module 51 can be downsized, making it possible to reduce manufacturing costs. Furthermore, since the capacitor unit 34 can be transported as a plurality of capacitor modules 51, compared to the case where the capacitor unit 34 is formed of one capacitor module, for example, the space of the tray that accommodates the capacitor unit 34 can be saved during transportation. This makes it possible to reduce transportation costs.

Furthermore, each of the plurality of capacitor modules 51 has an arc shape when viewed from the axial direction. At least a portion of the inlet flow path P1 and at least a portion of the outlet flow path P4 are arranged between the ends of the plurality of capacitor modules 51 in the circumferential direction. The outlet flow path P4 is arranged on the opposite side of the inlet flow path P1 in the radial direction with the axis O of the rotor 22 interposed therebetween.
Since at least a portion of the inlet flow path P1 and at least a portion of the outlet flow path P4 are arranged between the ends of the plurality of capacitor modules 51 in the circumferential direction, it is possible to downsize the rotating electric machine unit 1. Become. Furthermore, since the direction of flow of the refrigerant in the inlet flow path P1 and the flow direction of the refrigerant in the outlet flow path P4 can be arranged in a straight line, pressure loss in the inlet flow path P1 and the outlet flow path P4 can be reduced. Therefore, the cooling performance of the cooler 4 can be improved.

Moreover, the power conversion device 3 further includes a plurality of bus bars 37 that connect the plurality of power modules 35 and the plurality of coils 25, respectively.
Thereby, the power module 35 and the coil 25 can be easily electrically connected using the bus bar 37.

The cooler 4 further includes a plate 41 to which the plurality of power modules 35 are attached, and a first heat radiating member 44 provided between the plurality of bus bars 37 and the plate 41.
The bus bar 37 can be cooled by the cooler 4. Therefore, it becomes possible to input a larger amount of current to the bus bar 37, and it becomes possible to further increase the output of the rotating electric machine unit 1.

Further, the cooler 4 is formed with a plurality of coil grooves 42c in which the plurality of coils 25 are respectively arranged. The plurality of coil grooves 42c are filled with a thermally conductive filler 49.
Since the heat generated in the coil 25 is exchanged with the cooler 4 via the filler 49, the coil 25 can be cooled by the cooler 4. Therefore, it becomes possible to input a large amount of current to the coil 25, and it becomes possible to increase the output of the rotating electric machine unit 1. Further, the filler 49 allows the coil 25 to be fixed to the coil groove 42c. Therefore, damage to the coil 25 or electrical connection failure between the coil 25 and the power module 35 due to vibration of the rotating electrical machine unit 1, external force applied to the rotating electrical machine unit 1, etc. can be suppressed, and the rotating electrical machine The reliability of unit 1 can be improved.

Furthermore, harness through holes 41d and 42b are formed in the center of the cooler 4, into which the resolver harness 27c of the resolver 27 is inserted.
Since the resolver harness 27c can be arranged in the center of the cooler 4, a plurality of power modules 35 can be arranged, for example, at equal intervals in the circumferential direction, and the degree of freedom in arrangement of the power modules 35 is improved. . Therefore, for example, the plurality of power modules 35 can be arranged closer to each other, and the mounting density of members in the power conversion device 3 can be improved, and the rotating electric machine unit 1 can be downsized.

Further, the capacitor unit 34 includes a positive conductor 54 and a negative conductor 55. Power module 35 has a positive terminal 35b and a negative terminal 35c. The length of the first path from the positive electrode conductor 54 to the negative electrode conductor 55 via the positive electrode terminal 35b and negative electrode terminal 35c of the first power module 35 among the plurality of power modules 35 is the same as that of the plurality of power modules 35. This is approximately the same length as the second path to the negative conductor 55 via the positive terminal 35b and negative terminal 35c of the second power module 35 among the power modules 35. Note that the length of the first route is approximately the same as the length of the second route, which means that the difference between the length of the first route and the length of the second route is ±5% with respect to the total length of the first route. means within the range of
Thereby, the surge voltages generated in the first power module 35 and the second power module 35 can be equalized. Therefore, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1.

Further, in all of the plurality of power modules 35, the length of the path from the positive electrode conductor 54 to the negative electrode conductor 55 via the positive electrode terminal 35b and the negative electrode terminal 35c is approximately the same.
This makes it possible to equalize the surge voltage generated in each power module 35 for all power modules 35. Therefore, it becomes possible to input a larger amount of current to the power module 35, and it becomes possible to further increase the output of the rotating electric machine unit 1.

Moreover, the cooler 4 is arranged closer to the rotating electric machine 2 than the plurality of power modules 35 in the axial direction.
Thereby, the heat generated from the rotating electric machine 2 can be cut off by the cooler 4, so that the heat generated from the rotating electric machine 2 can be prevented from being transmitted to the power module 35. Therefore, it becomes possible to input a large amount of current to the power module 35, and it becomes possible to increase the output of the rotating electric machine unit 1.

Further, the condenser unit 34 and the cooler 4 are radially opposed to each other.
Thereby, the cooler 4 can cool the power module 35 in the axial direction and the condenser unit 34 in the radial direction. Therefore, the rotating electric machine unit 1 can be made smaller in the axial direction, compared to, for example, a case where the capacitor unit and the cooler are arranged side by side in the axial direction.

Embodiment 2.
Next, the rotating electric machine unit 1 according to the second embodiment will be explained. The basic configuration of the rotating electrical machine unit according to this embodiment is the same as that of the rotating electrical machine unit 1 of Embodiment 1, so the explanation will focus on the differences. FIG. 23 is a perspective view of the housing case 53A of the capacitor module 51 according to the present embodiment. FIG. 24 is a sectional view of the rotating electric machine unit 1 according to the present embodiment, and is a sectional view taken along line EE in FIG. 8.

As shown in FIG. 23, the storage case 53A includes a main body 531 and a plurality of pressing members 532 fixed to the main body 531. The pressing member 532 is provided on a surface of the main body portion 531 facing radially inward. The pressing member 532 has elasticity. An upper end portion of the pressing member 532 is fixed to a surface of the main body portion 531 facing radially inward. A protrusion that protrudes radially inward is provided at the lower end of the pressing member 532. The material of the main body portion 531 and the pressing member 532 is, for example, resin. The main body portion 531 and the pressing member 532 are integrally molded. Note that the pressing member 532 may be attached to the surface of the main body portion 531 facing inward in the radial direction using an adhesive.

As shown in FIG. 24, a positive cooled part 54e and a negative cooled part 55e are arranged inside the pressing member 532 in the radial direction. More specifically, the main body part 531, the pressing member 532, the positive side cooled part 54e or the negative side cooled part 55e, the second heat radiating member 45, and the base 42 (condenser cooling part 42e) have a diameter. They are arranged in this order from the outside to the inside. The lower end portion of the pressing member 532 contacts the positive cooled portion 54e and the negative cooled portion 55e from the outside in the radial direction. At this time, the lower end portion of the pressing member 532 is elastically deformed radially outward. Due to the elastic force of the pressing member 532, the positive side cooled portion 54e and the negative side cooled portion 55e are pressed against the second heat radiating member 45.

As described above, in this embodiment, the capacitor unit 34 includes the pressing member 532 that presses the positive side cooled part 54e and the negative side cooled part 55e against the second heat radiating member 45. This improves the adhesion between the positive electrode side cooled part 54e and the negative electrode side cooled part 55e and the second heat radiating member 45, so that the cooling performance of the capacitor unit 34 can be improved, and the output of the rotating electric machine unit 1 can be increased. becomes possible.

Note that the technical scope of the present disclosure is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present disclosure.

For example, the rotating electric machine unit 1 may be a multi-phase drive type rotating electric machine unit with six or more phases.
The capacitor unit 34 may be composed of only one capacitor module 51. The capacitor unit 34 may include three or more capacitor modules 51.

Hereinafter, various aspects of the present disclosure will be collectively described as supplementary notes.

(Additional note 1)
A rotating electric machine including a stator, a rotor that rotates around an axis relative to the stator, and a plurality of coils wound around the stator;
a power conversion device arranged in parallel with the rotating electric machine in an axial direction along the axis of the rotor;
a first cooling section in which a first cooling channel through which a refrigerant flows is formed to cool the power converter;
Equipped with
The power conversion device includes a plurality of power modules each electrically connected to the plurality of coils, and a capacitor unit electrically connected to the plurality of power modules,
The first cooling channel is
an inlet channel through which the refrigerant is supplied;
a first flow path that branches from the inlet flow path and is formed at a position overlapping a first group of power modules among the plurality of power modules when viewed from the axial direction;
a second flow path that branches from the inlet flow path and is formed at a position overlapping a second group of power modules different from the first group among the plurality of power modules when viewed from the axial direction;
It has an outlet flow path through which the refrigerant from the first flow path and the second flow path joins together, and through which the refrigerant is discharged from the first cooling section,
The capacitor unit is a rotating electrical machine unit arranged so as to surround the first cooling section from the outside in a radial direction.

(Additional note 2)
The plurality of power modules are arranged in a circumferential direction around the axis of the rotor,
The rotating electric machine unit according to supplementary note 1, wherein the first flow path extends from the inlet flow path to one side in the circumferential direction, and the second flow path extends from the inlet flow path to the other side in the circumferential direction. .

(Additional note 3)
a second cooling section in which a second cooling channel through which a refrigerant flows is formed and cools the rotating electric machine;
Furthermore,
The second cooling channel is
a communication flow path communicating with the outlet flow path;
a third flow path branching from the communication flow path and extending from the communication flow path to one side in the circumferential direction;
a fourth flow path that branches from the communication flow path and extends from the communication flow path to the other side in the circumferential direction;
a discharge flow path through which the refrigerant from the third flow path and the fourth flow path merge and the refrigerant is discharged from the second cooling section;
The rotating electrical machine unit according to Supplementary Note 1 or 2, which has:

(Additional note 4)
The first cooling unit has a plurality of heat radiation fins arranged in the first flow path or the second flow path,
The rotating electric machine unit according to any one of appendices 1 to 3, wherein the plurality of heat radiation fins are arranged at positions overlapping with the plurality of power modules when viewed from the axial direction.

(Appendix 5)
The capacitor unit has a positive conductor and a negative conductor,
The positive electrode conductor has a positive electrode side cooled portion disposed on the radially inner side of the capacitor unit,
The negative electrode conductor has a negative electrode side cooled part disposed on the radially inner side of the capacitor unit,
Supplementary notes 1 to 3, wherein the first cooling section has a condenser cooling section that is disposed radially outside the first cooling section and is thermally connected to the positive side cooled section and the negative side cooled section. 4. The rotating electric machine unit according to any one of 4.

(Appendix 6)
The rotating electric machine unit according to supplementary note 5, wherein the first cooling section includes a capacitor heat dissipation member provided between the positive electrode side cooled section, the negative electrode side cooled section, and the capacitor cooling section.

(Appendix 7)
The positive electrode conductor has a plurality of positive electrode side cooled parts as the positive electrode side cooled parts,
The negative electrode conductor has a plurality of negative electrode side cooled parts as the negative electrode side cooled parts,
The rotating electric machine unit according to appendix 5 or 6, wherein the first cooling section includes a plurality of capacitor cooling sections as the capacitor cooling section.

(Appendix 8)
8. The rotating electric machine unit according to any one of appendices 1 to 7, wherein the capacitor unit includes a plurality of capacitor modules arranged in a circumferential direction.

(Appendix 9)
Each of the plurality of capacitor modules has an arc shape when viewed from the axial direction,
At least a portion of the inlet flow path and at least a portion of the outlet flow path are arranged between the ends of the plurality of capacitor modules in the circumferential direction,
The rotating electrical machine unit according to appendix 8, wherein the outlet flow path is disposed on the opposite side of the inlet flow path in the radial direction with the axis of the rotor interposed therebetween.

(Appendix 10)
The rotating electric machine unit according to any one of Supplementary Notes 1 to 9, wherein the power conversion device further includes a plurality of bus bars that respectively connect the plurality of power modules and the plurality of coils.

(Appendix 11)
The rotating electric machine unit according to appendix 10, wherein the first cooling unit further includes a plate to which the plurality of power modules are attached, and a busbar heat dissipation member provided between the plurality of busbars and the plate.

(Appendix 12)
A plurality of coil grooves are formed in the first cooling part, in which the plurality of coils are respectively disposed,
The rotating electric machine unit according to any one of appendices 1 to 11, wherein the plurality of coil grooves are filled with a thermally conductive filler.

(Appendix 13)
The rotating electric machine further includes a resolver arranged between the stator and the power module and detecting a rotation angle of a shaft arranged at the center of the rotor,
The rotating electric machine unit according to any one of appendices 1 to 12, wherein an insertion hole through which a signal line of the resolver is inserted is formed in the center of the first cooling section.

(Appendix 14)
The capacitor unit has a positive conductor and a negative conductor,
Each of the plurality of power modules has a positive terminal connected to the positive conductor, and a negative terminal connected to the negative conductor,
The length of the first path from the positive conductor to the negative conductor via the positive terminal and the negative terminal of the first power module among the plurality of power modules is The rotation according to any one of Supplementary Notes 1 to 13, which is approximately the same as the length of the second path to the negative conductor via the positive terminal and the negative terminal of a second power module among the power modules. electrical unit.

(Appendix 15)
The rotating electrical machine unit according to appendix 14, wherein the length of the path from the positive conductor to the negative conductor via the positive terminal and the negative terminal is approximately the same in all of the plurality of power modules.

(Appendix 16)
16. The rotating electric machine unit according to any one of appendices 1 to 15, wherein the first cooling unit is arranged closer to the rotating electric machine than the plurality of power modules in the axial direction.

(Appendix 17)
17. The rotating electrical machine unit according to any one of appendices 1 to 16, wherein the capacitor unit and the first cooling section are radially opposed to each other.

(Appendix 18)
The rotating electric machine unit according to appendix 6 or 7, wherein the capacitor unit includes a pressing member that presses the positive electrode side cooled part and the negative electrode side cooled part against the capacitor heat radiating member.

1 Rotating electrical machine unit 2 Rotating electrical machine 3 Power converter 21 Stator 22 Rotor 23 Shaft 25 Coil 27 Resolver 34 Capacitor unit 35 Power module 35b Positive terminal 35c Negative terminal 37 Bus bar 41 Plate 41c Radiation fin 42 Base 42c Coil groove 42e Capacitor cooling Part 44 First heat radiating member (busbar heat radiating member)
45 Second heat dissipation member (capacitor heat dissipation member)
51 Capacitor module 54 Positive electrode conductor 54e Positive electrode side cooled part 55 Negative electrode conductor 55e Negative electrode side cooled part 65 Second cooling part 532 Pressing member O Axis center P1 Inlet flow path P2 First flow path P3 Second flow path P4 Outlet flow path P5 Communication channel P6 Third channel P7 Fourth channel P8 Discharge channel

Claims (18)

1. A rotating electric machine including a stator, a rotor that rotates around an axis relative to the stator, and a plurality of coils wound around the stator;
   a power conversion device arranged in parallel with the rotating electric machine in an axial direction along the axis of the rotor;
   a first cooling section in which a first cooling channel through which a refrigerant flows is formed to cool the power converter;
   Equipped with
   The power conversion device includes a plurality of power modules each electrically connected to the plurality of coils, and a capacitor unit electrically connected to the plurality of power modules,
   The first cooling channel is
   an inlet channel through which the refrigerant is supplied;
   a first flow path that branches from the inlet flow path and is formed at a position overlapping a first group of power modules among the plurality of power modules when viewed from the axial direction;
   a second flow path that branches from the inlet flow path and is formed at a position overlapping a second group of power modules different from the first group among the plurality of power modules when viewed from the axial direction;
   It has an outlet flow path through which the refrigerant from the first flow path and the second flow path joins together, and through which the refrigerant is discharged from the first cooling section,
   The capacitor unit is a rotating electric machine unit arranged so as to surround the first cooling section from the outside in a radial direction.
2. The plurality of power modules are arranged in a circumferential direction around the axis of the rotor,
   The rotating electric machine according to claim 1, wherein the first flow path extends from the inlet flow path to one side in the circumferential direction, and the second flow path extends from the inlet flow path to the other side in the circumferential direction. unit.
3. a second cooling section in which a second cooling channel through which a refrigerant flows is formed and cools the rotating electric machine;
   Furthermore,
   The second cooling channel is
   a communication flow path communicating with the outlet flow path;
   a third flow path branching from the communication flow path and extending from the communication flow path to one side in the circumferential direction;
   a fourth flow path that branches from the communication flow path and extends from the communication flow path to the other side in the circumferential direction;
   a discharge flow path through which the refrigerant from the third flow path and the fourth flow path merge and the refrigerant is discharged from the second cooling section;
   The rotating electric machine unit according to claim 1 or 2, comprising:
4. The first cooling unit has a plurality of heat radiation fins arranged in the first flow path or the second flow path,
   The rotating electric machine unit according to claim 1 , wherein the plurality of heat radiation fins are arranged at positions overlapping with the plurality of power modules when viewed from the axial direction.
5. The capacitor unit has a positive conductor and a negative conductor,
   The positive electrode conductor has a positive electrode side cooled portion disposed on the radially inner side of the capacitor unit,
   The negative electrode conductor has a negative electrode side cooled part disposed on the radially inner side of the capacitor unit,
   1 . The first cooling section includes a capacitor cooling section that is arranged radially outside the first cooling section and is thermally connected to the positive side cooled section and the negative side cooled section. The rotating electric machine unit described in .
6. The rotating electric machine unit according to claim 5, wherein the first cooling section includes a capacitor heat dissipation member provided between the positive electrode side cooled section, the negative electrode side cooled section, and the capacitor cooling section.
7. The positive electrode conductor has a plurality of positive electrode side cooled parts as the positive electrode side cooled parts,
   The negative electrode conductor has a plurality of negative electrode side cooled parts as the negative electrode side cooled parts,
   The rotating electric machine unit according to claim 5 , wherein the first cooling unit includes a plurality of capacitor cooling units as the capacitor cooling unit.
8. The rotating electric machine unit according to claim 1 or 2, wherein the capacitor unit includes a plurality of capacitor modules arranged in a circumferential direction.
9. Each of the plurality of capacitor modules has an arc shape when viewed from the axial direction,
   At least a portion of the inlet flow path and at least a portion of the outlet flow path are arranged between the ends of the plurality of capacitor modules in the circumferential direction,
   The rotating electric machine unit according to claim 8, wherein the outlet flow path is arranged on the opposite side in the radial direction from the inlet flow path with the axis of the rotor interposed therebetween.
10. The rotating electric machine unit according to claim 1 or 2, wherein the power conversion device further includes a plurality of bus bars that respectively connect the plurality of power modules and the plurality of coils.
11. The rotating electrical machine unit according to claim 10, wherein the first cooling unit further includes a plate to which the plurality of power modules are attached, and a busbar heat dissipation member provided between the plurality of busbars and the plate.
12. A plurality of coil grooves are formed in the first cooling part, in which the plurality of coils are respectively disposed,
    The rotating electric machine unit according to claim 1 or 2, wherein the plurality of coil grooves are filled with a thermally conductive filler.
13. The rotating electric machine further includes a resolver arranged between the stator and the power module and detecting a rotation angle of a shaft arranged at the center of the rotor,
    3. The rotating electric machine unit according to claim 1, wherein an insertion hole through which a signal line of the resolver is inserted is formed in a central portion of the first cooling section.
14. The capacitor unit has a positive conductor and a negative conductor,
    Each of the plurality of power modules has a positive terminal connected to the positive conductor, and a negative terminal connected to the negative conductor,
    The length of the first path from the positive conductor to the negative conductor via the positive terminal and the negative terminal of the first power module among the plurality of power modules is The rotating electric machine unit according to claim 1 or 2, wherein the length of the second path to the negative electrode conductor via the positive electrode terminal and the negative electrode terminal of a second power module among the power modules is approximately the same.
15. The rotating electric machine unit according to claim 14, wherein the length of the path from the positive conductor to the negative conductor via the positive terminal and the negative terminal is approximately the same in all of the plurality of power modules.
16. The rotating electrical machine unit according to claim 1 or 2, wherein the first cooling unit is arranged closer to the rotating electrical machine than the plurality of power modules in the axial direction.
17. The rotating electric machine unit according to claim 1 or 2, wherein the capacitor unit and the first cooling section are radially opposed to each other.
18. The rotating electric machine unit according to claim 6, wherein the capacitor unit includes a pressing member that presses the positive electrode side cooled part and the negative electrode side cooled part against the capacitor heat radiating member.

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