Rotating electric machine unit

Abstract

This rotating electric machine unit is provided with a rotating electric machine, a power conversion device, and a first cooling unit for cooling the power conversion device, the power conversion device having a plurality of power modules and a capacitor unit, the first cooling unit having a first cooling flow path through which a refrigerant flows. The first cooling flow path has an inlet flow path, and a first flow path branched from the inlet flow path and 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 branched from the inlet flow path and formed at a position overlapping with a second group of power modules different from the first group of power modules among the plurality of power modules when viewed from the axial direction, and an outlet flow path, the capacitor unit being configured to surround the first cooling portion from the outside in the radial direction.

Description

Technical Field

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

[0002] This application claims priority based on Japanese Patent Application No. 2022-090052 filed in Japan on June 2, 2022, the contents of which are cited herein. Background Art

[0003] Conventionally, there is known a rotating electrical machine unit in which a rotating electrical machine and a power conversion device are integrated. In Patent Document 1, a cooler for cooling the power conversion device is provided in the rotating electrical machine unit. A cooling flow path through which a refrigerant flows is formed in the cooler.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent No. 5501257 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In Patent Document 1, a plurality of power modules are arranged along a refrigerant flow flowing in a cooling flow path. In the structure of Patent Document 1, the temperature of the refrigerant on the downstream side of the cooling flow path is higher than the temperature of the refrigerant on the upstream side of the cooling flow path, so that the power module arranged on the downstream side of the cooling flow path may not be sufficiently cooled. That is, a deviation in the temperature of the refrigerant occurs between the upstream side and the downstream side of the cooling flow path, making it difficult to uniformly cool the plurality of power modules.

[0009] The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a rotating electrical machine unit capable of uniformly cooling a plurality of power modules and improving cooling performance.

[0010] Means for solving problems

[0011] The rotary electric machine unit disclosed in the present invention comprises: a rotary electric machine having a stator, a rotor rotating around an axis relative to the stator, and a plurality of coils wound and mounted on the stator; a power conversion device arranged in an axial direction along the axis of the rotor with the rotary electric machine; and a first cooling unit, which forms a first cooling flow path for circulating a refrigerant to cool the power conversion device, the power conversion device comprising: a plurality of power modules, which are electrically connected to the plurality of coils respectively; and a capacitor unit, which is electrically connected to the plurality of power modules, the first cooling flow path comprising: an inlet flow path, to which the refrigerant is supplied An inlet flow path; a first flow path branched from the inlet flow path and formed at a position overlapping with a first group of power modules among the plurality of power modules when viewed from the axial direction; a second flow path branched from the inlet flow path and formed at a position overlapping with a second group of power modules among the plurality of power modules that is different from the first group of power modules when viewed from the axial direction; and an outlet flow path, at which the refrigerant from the first flow path and the second flow path merges and the refrigerant is discharged from the first cooling portion, and the capacitor unit is configured to surround the first cooling portion from the radially outer side.

[0012] Effects of the Invention

[0013] According to the present disclosure, it is possible to provide a rotating electrical machine unit capable of uniformly cooling a plurality of power modules and improving cooling performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a circuit diagram of the rotating electrical machine unit according to the first embodiment.

[0015] Figure 2 It is a perspective view of the rotating electrical machine unit according to the first embodiment.

[0016] Figure 3 It is a perspective view of the rotating electrical machine unit according to Embodiment 1, and is a view showing a state in which a case is removed.

[0017] Figure 4 yes Figure 3 Top view of the .

[0018] Figure 5 It is along Figure 4 Cross-sectional view along line AA.

[0019] Figure 6 It is along Figure 4 Cross-sectional view of line BB.

[0020] Figure 7 This is a perspective view of the rotary electric machine unit, showing a state in which a case, a terminal block, a signal connector, and a control board are removed.

[0021] Figure 8 yes Figure 7 Top view of the .

[0022] Fig. 9 It is along Figure 8 Cross-sectional view of the CC line.

[0023] Fig.10 It is along Figure 8 Cross-sectional view of line DD.

[0024] Fig.11 It is along Figure 8 A cross-sectional view of line EE.

[0025] Fig.12 This is a perspective view of the capacitor module according to the first embodiment.

[0026] Fig.13 This is a perspective view of the capacitor module according to the first embodiment, and is a view showing a state in which the storage case is removed.

[0027] Fig.14 This is a perspective view of the positive electrode conductor according to the first embodiment.

[0028] Fig.15 This is a perspective view of the negative electrode conductor according to the first embodiment.

[0029] Fig.16 This is a perspective view of the power module, bus bar, current sensor, and resin component according to the first embodiment.

[0030] Fig.17 This is a perspective view of the bus bar according to the first embodiment.

[0031] Fig.18 It is a perspective view of the rotating electrical machine according to the first embodiment.

[0032] Fig.19 It is a perspective view of the rotating electrical machine and the cooler according to the first embodiment.

[0033] Fig. 20A This is a perspective view of the plate according to Embodiment 1.

[0034] Fig. 20B This is a perspective view of the plate according to Embodiment 1.

[0035] Fig.21 This is a perspective view of the base and the refrigerant inlet portion of Embodiment 1.

[0036] Fig.22A This is a perspective view of the inner cylinder portion of Embodiment 1.

[0037] Fig. 22B This is a perspective view of the inner cylinder portion of Embodiment 1.

[0038] Fig.23 This is a perspective view of a storage case of a capacitor module according to the second embodiment.

[0039] Fig.24 It is a cross-sectional view of a rotating electrical machine unit according to the second embodiment. DETAILED DESCRIPTION

[0040] Implementation method 1.

[0041] Hereinafter, a rotary electric machine unit 1 according to Embodiment 1 will be described with reference to the drawings.

[0042] Figure 1 is a circuit diagram of the rotating electrical machine unit 1 . Figure 2 is a perspective view of the rotary motor unit 1. Figure 2 and Fig.19 As shown, the rotating electrical machine unit 1 includes a rotating electrical machine 2, a power conversion device 3, and a cooler 4 (first cooling unit). The rotating electrical machine 2, the power conversion device 3, and the cooler 4 are integrated. Thus, the rotating electrical machine unit 1 can be miniaturized.

[0043] In addition, in this specification, the axis O (refer to Fig. 9 ) is referred to as the “axial direction”. In addition, 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 surrounding the axis O of the rotor 22 is referred to as the “circumferential direction”.

[0044] First, refer to Figure 1 The circuit configuration (electrical configuration) of the rotating electrical machine unit 1 will be described. In the present 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 electrical machine unit 1 is mounted on a vehicle, for example.

[0045] The rotating electrical machine 2 includes six coils 25U1, 25V1, 25W1, 25U2, 25V2, and 25W2 corresponding to six phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase). In addition, in this specification, the coils 25U1, 25V1, 25W1, 25U2, 25V2, and 25W2 are also simply referred to as coils 25.

[0046] The power conversion device 3 includes a capacitor unit 34 and six power modules 35U1, 35V1, 35W1, 35U2, 35V2, and 35W2 corresponding to six phases (U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase). In addition, in this specification, the power modules 35U1, 35V1, 35W1, 35U2, 35V2, and 35W2 are also referred to as power modules 35.

[0047] The power conversion device 3 receives DC power from a DC power source E such as a battery. The power conversion device 3 converts the DC power output from the DC power source E into AC power and supplies the AC power to the rotating electric machine 2 .

[0048] The capacitor unit 34 is a smoothing capacitor that stabilizes the voltage without greatly fluctuating relative to the power fluctuation of the DC power source E or the power fluctuation on the power module 35 side. The capacitor unit 34 has a plurality of (two in this embodiment) capacitor modules 51. Each capacitor module 51 is connected between the positive power supply terminal and the negative power supply terminal of the DC power source E. Each capacitor module 51 has a plurality of capacitor elements 52 connected in parallel. The capacitor module 51 may also have only one capacitor element 52.

[0049] Each power module 35 is connected between the positive power supply terminal and the negative power supply terminal of the DC power supply 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 SiCs (Silicon Carbide). The switching elements SW1 and SW2 are connected in series. The connection point between the switching element SW1 and the switching element SW2 is electrically connected to the coil 25 of the corresponding phase. The diode D1 is connected in anti-parallel to the switching element SW1. The diode D2 is connected in anti-parallel to the switching element SW2.

[0050] Next, the structure of the rotary electric machine unit 1 will be described.

[0051] <Rotary electrical machines>

[0052] First, refer to Fig. 9 , Fig.18 The rotating electrical machine 2 will be described below. Fig.18 It is a perspective view of the rotating electrical machine 2 .

[0053] like Fig. 9 As shown, the rotating electrical machine 2 includes a stator 21 , a rotor 22 , a shaft 23 , a housing 24 , a plurality of coils 25 (six coils 25U1 , 25V1 , 25W1 , 25U2 , 25V2 , 25W2 in this embodiment), first and second bearings 26 a , 26 b , and a rotary transformer 27 .

[0054] The stator 21 is annular and is provided so as to surround the outer circumference of the rotor 22. The stator 21 is fixed to the housing 24.

[0055] The rotor 22 is provided inside the stator 21 . The rotor 22 is rotatable around the axis O relative to the stator 21 .

[0056] The shaft 23 is disposed at the center of the rotor 22. One side (lower side) of the shaft 23 in the axial direction is an output side for transmitting the rotation of the rotor 22 to a vehicle or the like.

[0057] The housing 24 accommodates the stator 21, the rotor 22, and the shaft 23. The housing 24 includes a cover portion 61, an inner cylinder portion 62, an outer cylinder portion 63, and a bottom portion 64.

[0058] The cover 61 is a circular plate-like member. The cover 61 is fixed to the upper end of the inner cylinder 62. The cover 61 covers the stator 21 and the rotor 22 from above. Fig.18 As shown, the cover 61 is formed with a coil through hole 61a for inserting the coil end 25a of the coil 25. The six coil through holes 61a are arranged at equal intervals (60° intervals) in the circumferential direction. The cover 61 is formed with a connector receiving hole 61b for receiving the relay connector 47 described later.

[0059] The inner cylinder portion 62 has a cylindrical shape and covers the stator 21 from the radially outer side. The stator 21 is fixed to the inner cylinder portion 62 by, for example, shrink fitting or press fitting.

[0060] The outer cylinder portion 63 has a cylindrical shape and covers the inner cylinder portion 62 from the radially outer side. The outer cylinder portion 63 is fixed to the inner cylinder portion 62 by, for example, shrink fitting or press fitting.

[0061] The inner cylinder portion 62 and the outer cylinder portion 63 constitute a second cooling portion 65 for cooling the rotary electric machine 2. The second cooling portion 65 will be described in detail later.

[0062] 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 the rotor 22 from below. The bottom portion 64 is provided with a mounting portion 64a for mounting the rotary electric machine unit 1 on a vehicle.

[0063] The coil 25 is wound and mounted on the stator 21. The coil 25 is, for example, distributedly wound on the stator 21. As the coil 25, for example, a flat wire having a square cross-section with a side of 0.5 to 6.0 mm is used. The coil end 25a of the coil 25 of each phase is electrically connected to the power module 35 of the corresponding phase. Fig.18 As shown, six coil ends 25a are arranged at equal intervals (60° intervals) in the circumferential direction. After being inserted into the coil through-hole 61a, the coil end 25a is bent toward the radially outer side, and then is bent again to extend in the axial direction.

[0064] The rotary transformer 27 detects the rotation angle of the shaft 23. Fig.18As shown, 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 cover 61. The resolver rotor 27b is attached to the upper end portion of the shaft 23 (end portion on the non-output side).

[0065] The detection result of the resolver 27 is output to the control board 36 of the power conversion device 3 described later via the resolver harness 27c. The resolver harness 27c is led 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 to avoid the portion where the power module 35 is arranged. Thus, it is possible to prevent the noise caused by the power module 35 from being transmitted to the resolver harness 27c, and it is possible to improve the detection accuracy of the rotation angle of the shaft 23.

[0066] A first bearing 26a is provided at the upper end (non-output end) of the shaft 23. The first bearing 26a is fixed to the cover 61. A second bearing 26b is provided at the lower end (output end) of the shaft 23. The second bearing 26b is fixed to the bottom 64. The first bearing 26a and the second bearing 26b support the shaft 23 rotatably.

[0067] <Power conversion device>

[0068] Next, refer to Figure 2 to Figure 17 The power conversion device 3 will be described.

[0069] like Figure 2 , Figure 3 , Figure 7 As shown in the figures, the power conversion device 3 includes a shell 31, a terminal block 32 (a second external connection part), a signal connector 33 (a first external connection part), a capacitor unit 34, a control substrate 36, a plurality of power modules 35 (six power modules 35U1, 35V1, 35W1, 35U2, 35V2, and 35W2 in the present embodiment), a plurality of (six in the present embodiment) bus bars 37, a plurality of (six in the present embodiment) current sensors 38, and a plurality of (six in the present embodiment) resin parts 39.

[0070] Case 31 covers capacitor unit 34, power module 35, control board 36 and other electronic components from above, thereby ensuring insulation between these electronic components and peripheral components mounted on rotating electrical machine unit 1 and preventing foreign matter from entering from outside rotating electrical machine unit 1.

[0071] The terminal block 32 is provided on the upper surface of the housing 31. The terminal block 32 connects the DC power source E to the capacitor unit 34. The terminal block 32 is a second external connection portion that connects the power conversion device 3 to the DC power source E as an external power source. The terminal block 32 has a positive side connection terminal 32a, a negative side connection terminal 32b, and a storage housing 32c.

[0072] The positive electrode side connection terminal 32 a is connected to a positive power supply terminal of a DC power supply E and positive electrode conductors 54 of two capacitor modules 51 of a capacitor unit 34 described later.

[0073] The negative electrode side connection terminal 32 b is connected to a negative electrode power supply terminal of the DC power supply E and a negative electrode conductor 55 of two capacitor modules 51 of the capacitor unit 34 described later.

[0074] The housing case 32c houses the positive electrode side connection terminal 32a and the negative electrode side connection terminal 32b.

[0075] like Figure 3 As shown, the upper surface of the positive side connection terminal 32a is exposed from the storage case 32c, and the positive power supply terminal of the DC power supply E is connected to the upper surface. The two side surfaces in the circumferential direction of the positive side connection terminal 32a are exposed from the storage case 32c, and the positive conductors 54 of the two capacitor modules 51 are connected to these side surfaces respectively.

[0076] The upper surface of the negative-side connection terminal 32b is exposed from the housing case 32c, and is connected to the negative power supply terminal of the DC power supply E. Both side surfaces in the circumferential direction of the negative-side connection terminal 32b are exposed from the housing case 32c, and the negative conductors 55 of the two capacitor modules 51 are connected to these side surfaces, respectively.

[0077] The signal connector 33 is provided on the upper surface of the housing 31. The signal connector 33 is electrically connected to the control substrate 36. The signal connector 33 is used to exchange various signals between an external control device mounted on a vehicle or the like and the power conversion device 3. The signal connector 33 is a first external connection portion that connects the power conversion device 3 to the external control device.

[0078] like Figure 4 As shown, when viewed from the axial direction, the side where the signal connector 33 is arranged is called the front side, and the opposite side is called the rear side relative to the axis O of the rotor 22. The signal connector 33 is arranged on the front side of the rotating electrical machine unit 1. The terminal block 32 is arranged on the rear side of the rotating electrical machine unit 1.

[0079] Reference Figure 7 , Figure 8 , Figure 12 to Figure 15 The capacitor unit 34 will be described.

[0080] like Figure 8As shown, the capacitor unit 34 is arranged on the outer periphery of the power conversion device 3. When viewed from the axial direction, the capacitor unit 34 extends in the circumferential direction. The capacitor unit 34 is fixed to the cover portion 61.

[0081] 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 (e.g., power modules 35U1, 35V1, 35W1) of the six power modules 35, and the other is provided corresponding to the other half of the power modules 35 (e.g., 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.

[0082] like Fig.12 and Fig.13 As shown, the capacitor module 51 includes a plurality of capacitor elements 52 , a housing case 53 , a positive electrode conductor 54 , and a negative electrode conductor 55 .

[0083] The storage case 53 stores a plurality of capacitor elements 52, a portion of the positive conductor 54, and a portion of the negative conductor 55. In this state, the components stored in the storage case 53 are fixed by filling the interior of the storage case 53 with resin. In addition, in the storage 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.

[0084] A plurality of mounting portions 53a for mounting the capacitor module 51 on the cover portion 61 are formed at the lower portion of the storage case 53. The mounting portions 53a are protrusions that protrude radially outward from the outer peripheral surface of the storage case 53. Bolt holes are formed in the mounting portions 53a. Bolts 53b (see FIG. 1 ) are inserted into the mounting portions 53a. Figure 8 ) is fastened to the bolt hole, and the capacitor module 51 is mounted on the cover 61.

[0085] Fig.14 It 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 of the positive electrode conductor 54 and the negative electrode conductor 55, for example, oxygen-free copper is used. In order to reduce the cost of the material and improve the availability, tough pitch copper may also be used as the material of the positive electrode conductor 54 and the negative electrode conductor 55. In addition, the plate thickness of the positive electrode conductor 54 and the negative electrode conductor 55 is, for example, 0.5 to 2.5 mm.

[0086] The positive electrode conductor 54 is connected to the positive electrode side connection terminal 32a of the terminal block 32 and the positive electrode terminal 35b of the power module 35 described later. The positive electrode conductor 54 has a plurality of (three in this embodiment) first positive electrode terminals 54a, a second positive electrode terminal 54b, a plurality of third positive electrode terminals 54c, a positive electrode side connection portion 54d, and a plurality of (three in this embodiment) positive electrode side cooled portions 54e.

[0087] The three first positive terminal portions 54a are respectively provided corresponding to the half (three) power modules 35 mentioned above. The first positive terminal portion 54a is connected to the positive terminal 35b of the corresponding power module 35. The three first positive terminal portions 54a are arranged at equal intervals (60° intervals) in the circumferential direction. The three first positive terminal portions 54a are of the same shape. The first positive terminal portion 54a is led out from the upper part of the storage shell 53. Figure 8 As shown, the first positive electrode terminal 54 a is arranged to face the positive electrode terminal 35 b of the corresponding power module 35 in the radial direction.

[0088] The second positive terminal 54b is connected to the positive side connection terminal 32a of the terminal block 32. The second positive terminal 54b is led out from the upper part of the storage case 53. Figure 3 As shown, the second positive terminal 54b is arranged to be opposite to the side of the positive side connection terminal 32a. A bolt hole is formed at the front end of the second positive terminal 54b, and the second positive terminal 54b is fixed to the side of the positive side connection terminal 32a by fastening the bolt 54f to the bolt hole.

[0089] The plurality of third positive terminals 54c are provided corresponding to the plurality of capacitor elements 52. The third positive terminal 54c is fixed to the lower end of the capacitor element 52 by welding, for example. Thus, the third positive terminal 54c is connected to the positive electrode provided at the lower end of the capacitor element 52. The third positive terminal 54c is accommodated in the accommodation case 53.

[0090] The positive electrode side connection portion 54 d electrically connects the first positive electrode terminal 54 a , the second positive electrode terminal 54 b , and the third positive electrode terminal 54 c . The positive electrode side connection portion 54 d is accommodated in the accommodation case 53 .

[0091] The positive electrode side connecting portion 54d has a plurality of first straight portions 54d1, a plurality of first curved portions 54d2, and a first connecting end portion 54d3. The plurality of first straight portions 54d1 are formed, for example, by bending a plate-like member, and are formed as a whole to extend substantially in the circumferential direction. The plurality of first curved portions 54d2 connect the plurality of first straight portions 54d1 to each other. The first connecting end portion 54d3 is connected to the first straight portion 54d1 disposed on one side in the circumferential direction, and is bent toward the radially outer side relative to the first straight portion 54d1.

[0092] The positive electrode conductor 54 is formed by joining the first positive terminal 54a, the second positive terminal 54b, and the third positive terminal 54c, which are separated, to the positive electrode side connecting portion 54d. The first positive terminal 54a is joined to the upper end of the first straight portion 54d1. The second positive terminal 54b is joined to the upper end of the first connecting end 54d3. The third positive terminal 54c is joined to the lower end of the first straight portion 54d1.

[0093] The positive electrode side cooled portion 54e is provided to extend downward from the first positive terminal portion 54a. The positive electrode side cooled portion 54e is formed integrally with the first positive terminal portion 54a. The positive electrode side cooled portion 54e may be formed separately from the first positive terminal portion 54a.

[0094] like Fig.12 As shown, the positive electrode side portion to be cooled 54e is arranged radially inward of the capacitor module 51. The positive electrode side portion to be cooled 54e is arranged outside the housing case 53. The positive electrode side portion to be cooled 54e is thermally connected to the cooler 4.

[0095] 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 described later. The negative electrode conductor 55 has a plurality of (three in this embodiment) first negative electrode terminals 55a, a second negative electrode terminal 55b, a plurality of third negative electrode terminals 55c, a negative electrode side connection portion 55d, and a plurality of (three in this embodiment) negative electrode side cooled portions 55e.

[0096] The three first negative terminals 55a are respectively provided corresponding to the half (three) power modules 35. The first negative terminal 55a is connected to the negative terminal 35c of the corresponding power module 35. The three first negative terminals 55a are arranged at equal intervals (60° intervals) in the circumferential direction. The three first negative terminals 55a are of the same shape. The first negative terminal 55a is led out from the upper part of the storage shell 53. Figure 8 As shown, the first negative electrode terminal 55 a is arranged to face the negative electrode terminal 35 c of the corresponding power module 35 in the radial direction.

[0097] The second negative terminal 55b is connected to the negative-side connection terminal 32b of the terminal block 32. The second negative terminal 55b is led out from the upper portion of the storage case 53. Figure 3 As shown, the second negative terminal 55b is arranged to face the side of the negative side connection terminal 32b. A bolt hole is formed at the front end of the second negative terminal 55b, and the second negative terminal 55b is fixed to the side of the negative side connection terminal 32b by fastening a bolt 55f to the bolt hole.

[0098] The third negative terminal 55c is provided corresponding to each of the plurality of capacitor elements 52. The third negative terminal 55c is fixed to the upper end of the capacitor element 52 by welding, for example. Thus, the third negative terminal 55c is connected to the negative electrode provided at the upper end of the capacitor element 52. The third negative terminal 55c is accommodated in the accommodation case 53.

[0099] The negative electrode side connection portion 55 d electrically connects the first negative electrode terminal 55 a , the second negative electrode terminal 55 b , and the third negative electrode terminal 55 c . The negative electrode side connection portion 55 d is accommodated in the accommodation case 53 .

[0100] The negative electrode side connecting portion 55d has a plurality of second straight portions 55d1, a plurality of second curved portions 55d2, and a second connecting end portion 55d3. The plurality of second straight portions 55d1 are formed, for example, by bending a plate-like member, and are formed as a whole to extend substantially in the circumferential direction. The plurality of second curved portions 55d2 connect the plurality of second straight portions 55d1 to each other. The second connecting end portion 55d3 is connected to the second straight portion 55d1 disposed on one side in the circumferential direction, and is bent toward the radially outer side relative to the second straight portion 55d1.

[0101] The negative electrode conductor 55 is formed by joining the first negative terminal 55a, the second negative terminal 55b, and the third negative terminal 55c, which are separate, to the negative electrode side connecting portion 55d. The first negative terminal 55a is joined to the upper end of the second straight portion 55d1. The second negative terminal 55b is joined to the upper end of the second connecting end portion 55d3. The third negative terminal 55c is joined to the upper end of the second straight portion 55d1.

[0102] The negative electrode side portion to be cooled 55e is provided to extend downward from the first negative terminal 55a. The negative electrode side portion to be cooled 55e is formed integrally with the first negative terminal 55a. The negative electrode side portion to be cooled 55e may be formed separately from the first negative terminal 55a.

[0103] like Fig.12 As shown, the negative electrode side portion to be cooled 55e is arranged radially inward of the capacitor module 51. The negative electrode side portion to be cooled 55e is arranged outside the housing case 53. The negative electrode side portion to be cooled 55e is thermally connected to the cooler 4.

[0104] Reference Figure 7 , Figure 8 , Fig.16 , the power module 35 is described.

[0105] like Figure 7 and Figure 8As shown, six power modules 35 are arranged in the central part of the power conversion device 3. When viewed from the axial direction, the six power modules 35 are surrounded by the capacitor unit 34 from the radially outer side. 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 sequence in the circumferential direction. Therefore, the power modules 35 of the same phase (for example, the power modules 35U1 and 35U2 of the U1 phase and the U2 phase) are arranged to be opposite in the radial direction.

[0106] like Fig.16 As shown, each power module 35 has a main body 35a, a positive terminal 35b, a negative terminal 35c, an output terminal 35d, an upper arm signal terminal 35e, and a lower arm signal terminal 35f. The power module 35 is fixed to a plate 41 of a cooler 4 described later.

[0107] The main body 35a has a substantially rectangular shape when viewed from the axial direction. The main body 35a includes a switch element SW1 and a diode D1 on the upper arm side, and a switch element SW2 and a diode D2 on the lower arm side. A protrusion 35a1 for fixing a signal terminal 35e on the upper arm side is provided at a corner of the main body 35a.

[0108] The positive electrode terminal 35 b , the negative electrode terminal 35 c , the output terminal 35 d , the signal terminal 35 e on the upper arm side, and the signal terminal 35 f on the lower arm side are plate-shaped members.

[0109] As the material 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, for example, oxygen-free copper is used. In order to reduce the cost of materials and improve the availability, tough copper may be used as the material 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. In addition, the plate 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.

[0110] like Figure 8 As shown, the positive terminal 35b is configured to be opposite to the first positive terminal 54a. The positive terminal 35b is directly connected to the first positive terminal 54a. In addition, direct connection means that the positive terminal 35b and the first positive terminal 54a are connected in contact with each other without using a wire or the like. The connection between the positive terminal 35b and the first positive terminal 54a is, for example, resistance welding, ultrasonic bonding, TIG welding, or laser welding. When viewed from the axial direction, the connection portion between the first positive terminal 54a and the positive terminal 35b is located between the storage shell 53 and the main body 35a.

[0111] The negative terminal 35c is configured to be opposite to the first negative terminal 55a. The negative terminal 35c is directly connected to the first negative terminal 55a. In addition, direct connection means that the negative terminal 35c and the first negative terminal 55a are connected in contact with each other without using a wire or the like. The connection between the negative terminal 35c and the first negative terminal 55a is, for example, resistance welding, ultrasonic bonding, TIG welding, or laser welding. When viewed from the axial direction, the connection portion between the first negative terminal 55a and the negative terminal 35c is located between the storage shell 53 and the main body 35a.

[0112] In the present embodiment, the capacitor unit 34 and the power module 35 are arranged so that 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 substantially the same in all the power modules 35. That is, the length of the connection path between the capacitor unit 34 and the power module 35 is substantially the same in all the power modules 35. Here, the length of the path being substantially the same means that the difference in the length of the path between the power modules 35 is within the range of ±5% with respect to the total length of the path from the positive conductor 54 to the negative conductor 55 via the positive terminal 35b and the negative terminal 35c. Thus, the surge voltage generated in each power module 35 can be made equal. Therefore, a large amount of current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be increased.

[0113] In addition, in the present disclosure, the length of the connection path between the capacitor unit 34 and the power module 35 may be substantially the same for at least two power modules 35. Even in this case, the surge voltage generated in the two power modules 35 can be equalized. Therefore, a large amount of current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be increased.

[0114] In addition, the positive terminal 35b is directly connected to the first positive terminal 54a, and the negative terminal 35c is directly connected to the first negative terminal 55a. That is, the capacitor unit 34 and the power module 35 are connected by the shortest path. As a result, 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, a larger capacity current can be input to the power module 35, and the output of the rotating electric machine unit 1 can be further increased.

[0115] The output terminal 35 d is connected to the coil end 25 a of the coil 25 via the bus bar 37 .

[0116] In all power modules 35, the output terminal 35d is configured to be linearly symmetrical about the imaginary line passing through the middle position of the gap between the positive terminal 35b and the negative terminal 35c and the axis O. That is, the output terminal 35d is configured so that the center position of the output terminal 35d coincides with the middle position of the gap between the positive terminal 35b and the negative terminal 35c when viewed from the radial direction. As a result, in all power modules 35, the wiring resistance of the connection path from the positive conductor 54 to the coil end 25a and from the negative conductor 55 to the coil end 25a becomes uniform. Therefore, it is possible to prevent the current flowing through the power module 35 from being biased between the plurality of power modules 35.

[0117] The signal terminal 35e on the upper arm side is connected to the switch element SW1 and the diode D1 on the upper arm side. The signal terminal 35f on the lower arm side is connected to the switch 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 substrate 36. Figure 3 As shown, the signal terminal 35 e on the upper arm side and the signal terminal 35 f on the lower arm side are directly mounted on the control substrate 36 .

[0118] Reference Figure 8 , Fig.16 , Fig.17 The bus bar 37 will be described.

[0119] Each bus bar 37 connects the power module 35 of the corresponding phase to the coil 25. Figure 8 As shown, the bus bar 37 is arranged between the power modules 35 adjacent to each other in the circumferential direction.

[0120] like Fig.17 As shown, the bus bar 37 is a plate-shaped member. As a material of the bus bar 37, oxygen-free copper is used, for example. As a material of the bus bar 37, tough pitch copper may be used to reduce material costs and improve availability. The plate thickness of the bus bar 37 is, for example, 0.5 to 2.5 mm.

[0121] The bus bar 37 has a first terminal 37 a connected to the output terminal 35 d and a second terminal 37 b connected to the coil end 25 a .

[0122] The first terminal 37a is provided at an end portion of one side of the bus bar 37. Fig.16 As shown, the first terminal 37a is arranged to face the output terminal 35d. The first terminal 37a is directly connected to the output terminal 35d. In addition, direct connection means that the first terminal 37a and the output terminal 35d are connected to each other without using a wire or the like. The connection between the first terminal 37a and the output terminal 35d is, for example, resistance welding, ultrasonic bonding, TIG welding, or laser welding. Figure 8As shown in FIG. 1 , the connection portion between the first terminal 37 a and the output terminal 35 d is located radially inward of the main body portion 35 a when viewed in the axial direction.

[0123] The second terminal 37b is provided at the other end of the bus bar 37. Fig.16 As shown, the second terminal 37b is arranged to face the coil end 25a. The second terminal 37b is directly connected to the coil end 25a. In addition, direct connection means that the second terminal 37b and the coil end 25a are connected to each other without using a wire or the like. The connection between the second terminal 37b and the coil end 25a is made by, for example, resistance welding, ultrasonic bonding, TIG welding, or laser welding. Figure 8 As shown, the connection portion between the second terminal 37b and the coil end 25a is located radially outward of the main body portion 35a when viewed in the axial direction.

[0124] The bus bar 37 is formed with a notch 37c. The notch 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 notch 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 notch 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. Thus, the insulation between the bus bar 37 and the signal terminal 35f on the lower arm side can be ensured.

[0125] The bus bar 37 is formed with a fixing through hole 37d. Fig.16 As shown, a fixing column 41g attached to the plate 41 is inserted into the fixing through hole 37d.

[0126] A current sensor 38 is provided on each bus bar 37. The bus bar 37 is inserted into the inner space of the core of the current sensor 38. The current sensor 38 detects the current flowing through the bus bar 37. The current sensor 38 has a signal terminal 38a connected to the control board 36.

[0127] The detection result of the current sensor 38 is output from the signal terminal 38a to the control substrate 36. Figure 3 As shown, the signal terminal 38a is directly mounted on the control board 36. This improves noise resistance and the detection accuracy of the current value of the bus bar 37 by the current sensor 38 is improved.

[0128] like Fig.16 As shown, the bus bar 37 and the current sensor 38 are covered by the resin member 39. In addition, the signal terminal 38a is exposed from the resin member 39. The resin member 39 holds the bus bar 37 and the current sensor 38 integrally. As a material for the resin member 39, for example, polyphenylene sulfide (PPS) is used. The resin member 39 is connected together with the control substrate 36 by bolts 41f3 (see Figure 4 ) is fixed to plate 41.

[0129] Reference Figure 3 and Figure 4 , the control substrate 36 is described.

[0130] The control substrate 36 has a polygonal shape. The control substrate 36 is arranged in the central part of the power conversion device 3. Figure 4 As shown, when viewed from the axial direction, the control substrate 36 is surrounded from the radially outer side by the capacitor unit 34. The control substrate 36 is fixed to the plate 41 by bolts 41f1 and 41f3.

[0131] The signal terminal 35e on the upper arm side, the signal terminal 35f on the lower arm side, and the signal terminal 38a are directly connected to the control substrate 36. The signal connector 33 is connected to the control substrate 36 via a signal connector plug. A harness insertion hole 36a for inserting the resolver harness 27c is formed in the central portion of the control substrate 36. The detection result of the resolver 27 is input to the control substrate 36 via the resolver harness 27c. The control substrate 36 controls the power module 35 based on a control command input from an external control device mounted on a vehicle or the like.

[0132] <Cooler>

[0133] Reference Figure 5 , Figure 6 , Fig. 9 , Fig.11 , Figure 19 to Figure 21 The cooler 4 will be described below.

[0134] The cooler 4 cools the power conversion device 3. Figure 5 As shown, the cooler 4 is arranged radially inside the capacitor module 51 (capacitor unit 34 ). The cooler 4 is fixed to the cover portion 61 .

[0135] Fig.19 4 is a perspective view of the cooler 4 and the rotating electrical machine 2. Fig.19 As shown, the cooler 4 has a plate 41, a base 42, a refrigerant inlet portion 43, a first heat sink 44 (bus bar heat sink), and a second heat sink 45 (capacitor heat sink).

[0136] Fig. 20A and Fig. 20B is a three-dimensional diagram of the plate 41. Fig. 20A as well as Fig. 20BAs shown, the plate 41 is a roughly polygonal plate-shaped member. For example, the material of the plate 41 is aluminum. The material of the plate 41 can also be appropriately changed. The power module 35 is mounted on the first surface 41a of the plate 41. The power module 35 is fixed to the first surface 41a of the plate 41 by welding, for example. The power module 35 is thermally connected to the plate 41.

[0137] like Fig. 20A As shown, a first mounting hole 41h1 with a bottom, a second mounting hole 41h2 and a third mounting hole 41h3 are provided on the first surface 41a of the plate 41.

[0138] A fixing column 41g (see FIG. 4A ) for fixing the control substrate 36 to the plate 41 is installed in the first mounting hole 41h1. Figure 8 ). The upper end of the fixing column 41g is in contact with the lower surface of the control substrate 36. In this state, the fixing column 41g is fixed with the bolt 41f1 (see Figure 4 ) fixes the control substrate 36 and the fixing column 41g, and the control substrate 36 is fixed relative to the plate 41. Fig.16 As shown, the fixing through-hole 37 d formed in the bus bar 37 is inserted into the fixing column 41 g , whereby the bus bar 37 is fixed to the plate 41 .

[0139] Bolts 41f2 (see FIG. 4A ) for fixing the resin member 39 to the plate 41 are installed in the second mounting holes 41h2. Figure 8 ).

[0140] Bolts 41f3 (see FIG. 4 ) for fixing the control substrate 36 and the resin member 39 to the plate 41 are installed in the third mounting holes 41h3. Figure 4 ). The upper end of the resin component 39 abuts against the lower surface of the control substrate 36. In this state, the control substrate 36, the resin component 39 and the plate 41 are fastened with the bolts 41f3, so that the control substrate 36 and the resin component 39 are fixed to the plate 41.

[0141] like Fig. 20B As shown, a heat sink 41c is provided on the second surface 41b of the plate 41. Fig.11 As shown, the heat sink 41c is arranged at a position overlapping with the power module 35 in the axial direction. The second surface 41b of the plate 41 is fixed to the base 42.

[0142] The plate 41 has a harness through hole 41d (through hole) through which the resolver harness 27c is inserted. The plate 41 has a coil groove 41e in which the coil end 25a is disposed on the outer peripheral surface. The six coil grooves 41e are arranged at equal intervals (60° intervals) in the circumferential direction.

[0143] like Fig.19As shown, a first heat dissipation component 44 is provided on the first surface 41a of the plate 41. The first heat dissipation component 44 is hexagonal in shape. Fig.11 As shown, the first heat sink 44 is disposed between the plate 41 and the bus bar 37. The bus bar 37 is thermally connected to the plate 41 via the first heat sink 44.

[0144] Fig.21 4 is a perspective view of the base 42 and the refrigerant inlet 43. Fig.21 As shown, the base 42 is a generally 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 also be appropriately changed. Fig.11 As shown, the base 42 is surrounded by the capacitor module 51 (capacitor unit 34) from the outside in the radial direction. The side surface of the base 42 is opposite to the capacitor module 51 in the radial direction.

[0145] The plate 41 is fixed to the first surface 42 a of the base 42 . The second surface of the base 42 is fixed to the cover 61 .

[0146] A harness through hole 42b (through hole) for inserting the rotary transformer harness 27c is formed in the center of the base 42. A coil groove 42c extending in the axial direction is formed on the side surface of the base 42. Fig.19 As shown, the coil end 25a is arranged in the coil groove portion 42c. Six coil groove portions 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 portion 42c by the filler 49. The coil end 25a is thermally connected to the base 42 via the filler 49. By releasing the heat generated by the coil end 25a to the base 42 via the filler 49, the coil 25 can be cooled.

[0147] A capacitor cooling portion 42e is provided on the side of the base 42 for cooling the capacitor module 51. Fig.19 As shown in FIG. 1 , the capacitor cooling portion 42e is provided with a second heat sink 45. The second heat sink 45 has a rectangular shape.

[0148] like Figure 6 As shown in FIG. 1 , the second heat sink 45 is provided to be radially opposed to the positive-side cooled portion 54e of the positive conductor 54 and the negative-side cooled portion 55e of the negative conductor 55. The positive-side cooled portion 54e and the negative-side cooled portion 55e are in contact with the second heat sink 45 and are thermally connected to the capacitor cooling portion 42e via the second heat sink 45.

[0149] return Fig.19The refrigerant inlet 43 is mounted on the side of the base 42. The refrigerant inlet 43 is provided to protrude radially outward from the base 42. The refrigerant inlet 43 is formed integrally with the base 42. A flow path for the refrigerant to flow is formed inside the refrigerant inlet 43. The refrigerant inlet 43 is connected to a first joint 46 for supplying refrigerant from the outside. The refrigerant inlet 43 and the first joint 46 are arranged on the front side of the rotary motor unit 1.

[0150] A first cooling flow path through which a refrigerant flows is formed in the cooler 4. As the refrigerant, water (cooling water) is used, for example. Fig.21 As shown, the first cooling flow path has an inlet flow path P1, a first flow path P2, a second flow path P3 and an outlet flow path P4. Refrigerant is supplied to the inlet flow path P1 from the first joint 46. The first flow path P2 and the second flow path P3 branch from the inlet flow path P1. When viewed from the axial direction, the first flow path P2 is formed at a position overlapping with half of the power modules 35 (specifically, power modules 35U1, 35V1, 35W1) of the six power modules 35. The first flow path P2 extends from the inlet flow path P1 to one side of the circumference. When viewed from the axial direction, the second flow path P3 is formed at a position overlapping with the other half of the power modules 35 (specifically, power modules 35U2, 35V2, 35W2) of the six power modules 35. The second flow path P3 extends from the inlet flow path P1 to the other side of the circumference. At the outlet flow path P4, the refrigerants from the first flow path P2 and the second flow path P3 merge. The outlet flow path P4 communicates with the second cooling flow path formed inside the second cooling portion 65 .

[0151] The base 42 is provided with a refrigerant supply port 42f, an annular groove portion 42g, and a refrigerant discharge port 42h.

[0152] The refrigerant supply port 42f is a hole that radially penetrates the peripheral wall of the base 42. The 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 portion 42g. The refrigerant inlet portion 43 and the refrigerant supply port 42f serve as an inlet flow path P1.

[0153] 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 of the refrigerant supply port 42f in the circumferential direction. One end of the refrigerant discharge port 42h is connected to the annular groove portion 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 to the opening 62c of the inner cylinder portion 62 described later. The refrigerant discharge port 42h and the relay joint 47 serve as an outlet flow path P4.

[0154] like Figure 8As shown, the refrigerant inlet 43 is arranged in the gap on the front side of the two gaps between the ends in the circumferential direction of the capacitor module 51. The refrigerant discharge port 42h and the relay joint 47 are arranged in the gap on the rear side of the two gaps between the ends in the circumferential direction of the capacitor module 51. 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 in the circumferential direction of the capacitor module 51. The outlet flow path P4 is arranged on the side opposite to the inlet flow path P1 in the radial direction across the axis O.

[0155] 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 42g is formed to avoid the harness through hole 42b. The refrigerant supply port 42f and the refrigerant discharge port 42h are opened on the radially outer side of the annular groove 42g.

[0156] The annular groove portion 42g has a first groove portion 42g1 as a portion on one side sandwiched between the refrigerant supply port 42f and the refrigerant discharge port 42h, and a second groove portion 42g2 as a portion on the other side sandwiched between the refrigerant supply port 42f and the refrigerant discharge port 42h. The first groove portion 42g1 is provided below half of the power modules 35 (specifically, the power modules 35U1, 35V1, and 35W1) of the six power modules 35. The second groove portion 42g2 is provided below the other half of the power modules 35 (specifically, the power modules 35U2, 35V2, and 35W2) of the six power modules 35.

[0157] The first groove portion 42g1 and the second surface 41b of the plate 41 form the first flow path P2. The second groove portion 42g2 and the second surface 41b of the plate 41 form the second flow path P3. Fig.11 As shown, the heat sink 41c is arranged inside the annular groove portion 42g (that is, the first flow path P2 or the second flow path P3).

[0158] The refrigerant supplied from the first joint 46 branches into the first flow path P2 and the second flow path P3 through the inlet flow path P1. The heat generated by the power modules 35U1, 35V1, and 35W1 is heat-exchanged with the refrigerant flowing in the first flow path P2 via the heat sink 41c. Thus, the power modules 35U1, 35V1, and 35W1 are cooled. The heat generated by the power modules 35U2, 35V2, and 35W2 is heat-exchanged with the refrigerant flowing in the second flow path P3 via the heat sink 41c. Thus, the power modules 35U2, 35V2, and 35W2 are cooled.

[0159] The positive side cooled portion 54e and the negative side cooled portion 55e of the capacitor module 51 are thermally connected to the capacitor cooling portion 42e via the second heat sink 45. The heat generated by the capacitor module 51 (capacitor element 52) ​​is transferred to the positive side cooled portion 54e and the negative side cooled portion 55e, and heat is exchanged with the refrigerant flowing in the first flow path P2 and the second flow path P3 via the capacitor cooling portion 42e and the second heat sink 45. As a result, the capacitor module 51 is cooled.

[0160] The bus bar 37 is thermally connected to the plate 41 via the first heat sink 44. The heat generated by the bus bar 37 is heat-exchanged with the refrigerant flowing in the first flow path P2 and the second flow path P3 via the first heat sink 44 and the plate 41. Thus, the bus bar 37 is cooled.

[0161] Thereafter, the refrigerants from the first flow path P2 and the second flow path P3 merge at the outlet flow path P4 and are discharged toward the second cooling unit 65 .

[0162] <Second Cooling Section>

[0163] Reference Fig. 9 22 illustrates the second cooling unit 65.

[0164] like Fig. 9 As shown, the inner cylinder 62 and the outer cylinder 63 constitute the second cooling unit 65. A second cooling flow path through which the refrigerant flows is formed in the second cooling unit 65. The second cooling flow path is formed between the outer circumferential surface of the inner cylinder 62 and the inner circumferential surface of the outer cylinder 63.

[0165] Fig.22A and Fig. 22B 62 is a three-dimensional diagram of the inner cylinder portion. Fig.22A and Fig. 22B As shown in FIG. 1 , the inner cylinder portion 62 includes a cylindrical main body portion 62a and a flange portion 62b protruding radially outward from the upper end of the main body portion 62a. An opening portion 62c is formed in the flange portion 62b. Fig. 9 As shown, the refrigerant discharge port 42h and the opening portion 62c are connected via a relay joint 47 .

[0166] The second cooling flow path includes a connecting flow path P5, a third flow path P6, a fourth flow path P7, and a discharge flow path P8. The connecting flow path P5 is connected to the outlet flow path P4. The third flow path P6 and the fourth flow path P7 are branched from the connecting flow path P5. The third flow path P6 extends from the connecting flow path P5 to one side in the circumferential direction. The fourth flow path P7 extends from the connecting flow path P5 to the other side in the circumferential direction. At the discharge flow path P8, the refrigerant from the third flow path P6 and the fourth flow path P7 merges. The refrigerant is discharged to the outside from the discharge flow path P8.

[0167] A first groove portion 62d, a second groove portion 62e, a third groove portion 62f, and a fourth groove portion 62g are formed on the outer peripheral surface of the main body portion 62a.

[0168] The first groove 62d is formed below the opening 62c. The first groove 62d extends in the axial direction. The upper end of the first groove 62d is connected to the opening 62c. The lower end of the first groove 62d is closed. The inner peripheral surface of the outer cylinder 63 and the first groove 62d form a communication flow path P5.

[0169] The second groove 62e is formed on the opposite side of the first groove 62d in the circumferential direction. The second groove 62e extends in the axial direction. The upper and lower ends of the second groove 62e are closed. The second groove 62e and the inner circumferential surface of the outer cylinder 63 form a discharge flow path P8.

[0170] 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 in the circumferential direction. A plurality of third groove portions 62f are formed at intervals in the axial direction. The third flow path P6 is formed by the third groove portion 62f and the inner circumferential surface of the outer cylinder portion 63.

[0171] The fourth groove portion 62g is connected to the first groove portion 62d and the second groove portion 62e. The fourth groove portion 62g extends from the first groove portion 62d to the second groove portion 62e to the other side in the circumferential direction. A plurality of fourth groove portions 62g are formed at intervals in the axial direction. The fourth flow path P7 is formed by the fourth groove portion 62g and the inner circumferential surface of the outer cylinder portion 63.

[0172] like Fig. 9 As shown, an opening 63a is formed at the lower end of the outer cylinder 63 and penetrates the peripheral wall of the outer cylinder 63 in the radial direction. The opening 63a is connected to the second groove 62e. The opening 63a is connected to the second joint 48 for discharging the refrigerant to the outside. In addition, the second joint 48 is arranged on the front side of the rotary electric machine unit 1.

[0173] The refrigerant discharged from the refrigerant discharge port 42h of the cooler 4 flows into the connecting flow path P5 via the relay joint 47 and the opening 62c. The refrigerant flows from the opening 62c in the connecting flow path P5 toward the axially downward direction (i.e., toward the output side), while branching into the third flow path P6 and the fourth flow path P7. The refrigerant flowing in the third flow path P6 cools the half of the rotating electrical machine 2 on one circumferential side. The refrigerant flowing in the fourth flow path P7 cools the half of the rotating electrical machine 2 on the other circumferential side. The plurality of third flow paths P6 and fourth flow paths P7 are arranged at intervals in the axial direction, so that the cooling efficiency of the rotating electrical machine 2 achieved by the second cooling unit 65 is improved. Thereafter, the refrigerant from the third flow path P6 and the fourth flow path P7 merges at the discharge flow path P8, flows downward in the discharge flow path P8, and is discharged to the outside via the opening 63a and the second joint 48.

[0174] As described above, the rotary electric machine unit 1 includes the rotary electric machine 2, the power conversion device 3, and the cooler 4, which forms a first cooling flow path through which the refrigerant flows and cools the power conversion device 3. The power conversion device 3 includes a plurality of power modules 35 and a capacitor unit 34. The first cooling flow path includes an inlet flow path P1 to which the refrigerant is supplied, a first flow path P2 branched from the inlet flow path P1 and formed at a position overlapping with a first group of power modules 35 among the plurality of power modules 35 when viewed from the axial direction, a second flow path P3 branched from the inlet flow path P1 and formed at a position overlapping with a second group of power modules 35 different from the first group of power modules 35 among the plurality of power modules 35 when viewed from the axial direction, and an outlet flow path P4, at which the refrigerants from the first flow path P2 and the second flow path P3 merge and are discharged from the cooler 4. The capacitor unit 34 is arranged to surround the cooler 4 from the radially outer side.

[0175] The power conversion device 3 can be cooled by the cooler 4. In addition, the refrigerant branches into the first flow path P2 and the second flow path P3 and circulates. Therefore, compared with the case where a plurality of power modules 35 are arranged on the cooling flow path of one system without branching the cooling flow path, it is possible to suppress the temperature of the refrigerant from deviating between the upstream side and the downstream side of the cooling flow path. Therefore, it is possible to uniformly cool the plurality of power modules 35, and to improve the cooling performance of the rotating electric machine unit 1. In addition, as a result, a large-capacity current can be input to the power module 35, and a high output of the rotating electric machine unit 1 can be achieved. Furthermore, the capacitor unit 34 is configured to surround the cooler 4 from the radially outer side, so that the rotating electric machine unit 1 can be miniaturized in the axial direction, compared with, for example, the case where the capacitor unit is arranged above the cooler.

[0176] In addition, the plurality of power modules 35 are arranged along 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.

[0177] Thus, the plurality of power modules 35 can be cooled more uniformly and efficiently.

[0178] In addition, the rotary electric machine unit 1 is further provided with a second cooling portion 65, which forms a second cooling flow path through which the refrigerant flows, and cools the rotary electric machine 2. The second cooling flow path includes: a connecting flow path P5, which is connected to the outlet flow path P4; a third flow path P6, which branches from the connecting flow path P5 and extends from the connecting flow path P5 to one side in the circumferential direction; a fourth flow path P7, which branches from the connecting flow path P5 and extends from the connecting flow path P5 to the other side in the circumferential direction; and a discharge flow path P8, at which the refrigerant from the third flow path P6 and the fourth flow path P7 merges, and the refrigerant is discharged from the second cooling portion 65.

[0179] Since the first cooling flow path of the cooler 4 and the second cooling flow path of the second cooling portion 65 are connected in the rotary electric machine unit 1, the rotary electric machine unit 1 can be miniaturized. In addition, the refrigerant flowing in the third flow path P6 can be used to cool one half of the rotary electric machine 2 in the circumferential direction, and the refrigerant flowing in the fourth flow path P7 can be used to cool the other half of the rotary electric machine 2 in the circumferential direction, so the cooling efficiency of the rotary electric machine 2 by the second cooling portion 65 is improved.

[0180] The cooler 4 has a plurality of fins 41 c disposed in the first flow path P2 or the second flow path P3 . The plurality of fins 41 c are disposed at positions overlapping with the plurality of power modules 35 when viewed from the axial direction.

[0181] This improves the cooling efficiency of the power module 35 by the cooler 4. As a result, a large amount of current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be increased.

[0182] In addition, the capacitor unit 34 includes a positive electrode conductor 54 and a negative electrode conductor 55. The positive electrode conductor 54 includes a positive electrode side cooled portion 54e disposed radially inside the capacitor unit 34. The negative electrode conductor 55 includes a negative electrode side cooled portion 55e disposed radially inside the capacitor unit 34. The cooler 4 includes a capacitor cooling portion 42e disposed radially outside the cooler 4 and thermally connected to the positive electrode side cooled portion 54e and the negative electrode side cooled portion 55e.

[0183] The capacitor unit 34 has a positive electrode side cooled portion 54e and a negative electrode side cooled portion 55e, which are arranged on the radial inner side of the capacitor unit 34 and are thermally connected to the capacitor cooling portion 42e. As a result, the capacitor unit 34 can be cooled from the radial inner side. In addition, compared with the case where the capacitor unit is cooled from the upper side in the axial direction, for example, the area for cooling the capacitor unit 34 can be set larger. As a result, the cooling performance of the cooler 4 on the capacitor unit 34 can be improved, and the high output of the rotating electric machine unit 1 can be achieved.

[0184] 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 the output of the rotating electrical machine unit 1 can be increased.

[0185] In addition, since the capacitor unit 34 is cooled by using the positive electrode side cooled portion 54e and the negative electrode side cooled portion 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, and it is possible to suppress the surge voltage generated in the power module 35. Therefore, a larger capacity current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be further increased.

[0186] In addition, the cooler 4 includes a second heat sink 45 provided between the positive electrode side portion to be cooled 54 e and the negative electrode side portion to be cooled 55 e and the capacitor cooling portion 42 e.

[0187] This improves the cooling efficiency of the capacitor unit 34 by the cooler 4 .

[0188] Furthermore, the positive electrode conductor 54 has a plurality of positive electrode side cooled portions 54 e , the negative electrode conductor 55 has a plurality of negative electrode side cooled portions 55 e , and the cooler 4 has a plurality of capacitor cooling portions 42 e .

[0189] As a result, the cooling performance of the cooler 4 on the capacitor unit 34 is further improved.

[0190] Furthermore, the capacitor unit 34 includes a plurality of capacitor modules 51 arranged in the circumferential direction.

[0191] Thus, it is possible to miniaturize the molds and the like used to form the components of the capacitor module 51, thereby reducing the manufacturing cost. In addition, since the capacitor unit 34 can be transported as a plurality of capacitor modules 51, compared with a case where the capacitor unit 34 is formed by one capacitor module, for example, it is possible to save space on a tray for storing the capacitor unit 34 during transportation, thereby reducing the transportation cost.

[0192] In addition, when viewed from the axial direction, each of the plurality of capacitor modules 51 has an arc shape. At least a portion of the inlet flow path P1 and at least a portion of the outlet flow path P4 are disposed between the circumferential ends of the plurality of capacitor modules 51. The outlet flow path P4 is disposed on the opposite side of the inlet flow path P1 in the radial direction across the axis O of the rotor 22.

[0193] Since at least a portion of the inlet flow path P1 and at least a portion of the outlet flow path P4 are disposed between the ends of the plurality of capacitor modules 51 in the circumferential direction, it is possible to achieve miniaturization of the rotary electric machine unit 1. In addition, since the flow direction 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, it is possible to reduce the pressure loss in the inlet flow path P1 and the outlet flow path P4, and to improve the cooling performance of the cooler 4.

[0194] The power conversion device 3 also includes a plurality of bus bars 37 that respectively connect the plurality of power modules 35 and the plurality of coils 25 .

[0195] Thus, the power module 35 and the coil 25 can be easily electrically connected using the bus bar 37 .

[0196] In addition, the cooler 4 also includes a plate 41 on which the plurality of power modules 35 are mounted, and a first heat dissipating member 44 provided between the plurality of bus bars 37 and the plate 41 .

[0197] The bus bar 37 can be cooled by the cooler 4. Therefore, a larger amount of current can be input to the bus bar 37, and the output of the rotating electrical machine unit 1 can be further increased.

[0198] In addition, the cooler 4 is formed with a plurality of coil grooves 42c in which the plurality of coils 25 are respectively disposed. The plurality of coil grooves 42c are filled with a filler 49 having thermal conductivity.

[0199] The heat generated by the coil 25 is heat-exchanged with the cooler 4 via the filler 49, so the coil 25 can be cooled by the cooler 4. Therefore, a large amount of current can be input to the coil 25, and the high output of the rotating electrical machine unit 1 can be achieved. In addition, the coil 25 can be fixed to the coil groove portion 42c by the filler 49. Therefore, it is possible to suppress the damage of the coil 25 caused by the vibration of the rotating electrical machine unit 1, the external force applied to the rotating electrical machine unit 1, etc., or the occurrence of poor electrical connection between the coil 25 and the power module 35, and the reliability of the rotating electrical machine unit 1 can be improved.

[0200] Furthermore, in the center portion of the cooler 4 , harness through holes 41 d and 42 b are formed through which the resolver harness 27 c of the resolver 27 is inserted.

[0201] Since the resolver harness 27c can be arranged in the center of the cooler 4, the plurality of power modules 35 can be arranged at equal intervals in the circumferential direction, for example, and the degree of freedom in the arrangement of the power modules 35 is increased. Therefore, for example, the plurality of power modules 35 can be arranged closer together, the mounting density of the components in the power conversion device 3 can be increased, and the rotary electric machine unit 1 can be miniaturized.

[0202] In addition, the capacitor unit 34 includes a positive electrode conductor 54 and a negative electrode conductor 55. The power module 35 includes a positive electrode terminal 35b and a negative electrode terminal 35c. The length of a first 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 of a first power module 35 among the plurality of power modules 35 is substantially the same as the length of a second 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 of a second power module 35 among the plurality of power modules 35. In addition, the length of the first path being substantially the same as the length of the second path means that the difference between the length of the first path and the length of the second path is within a range of ±5% with respect to the total length of the first path.

[0203] This makes it possible to make the surge voltages generated in the first power module 35 and the second power module 35 equal. Therefore, a large amount of current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be increased.

[0204] In addition, in the plurality of power modules 35 , the lengths of the paths from the positive electrode conductor 54 to the negative electrode conductor 55 via the positive electrode terminal 35 b and the negative electrode terminal 35 c are all substantially the same.

[0205] As a result, the surge voltage generated in each power module 35 can be made equal for all the power modules 35. Therefore, a larger current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be further increased.

[0206] The cooler 4 is arranged on the rotating electrical machine 2 side with respect to the plurality of power modules 35 in the axial direction.

[0207] Thus, the heat generated by the rotating electrical machine 2 can be blocked by the cooler 4, thereby preventing the heat generated by the rotating electrical machine 2 from being transferred to the power module 35. Therefore, a large amount of current can be input to the power module 35, and the output of the rotating electrical machine unit 1 can be increased.

[0208] Furthermore, the capacitor unit 34 and the cooler 4 are opposed to each other in the radial direction.

[0209] Thus, the cooler 4 can cool the power module 35 in the axial direction and cool the capacitor unit 34 in the radial direction. Therefore, the rotating electrical 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.

[0210] Implementation method 2.

[0211] Next, a rotary electric machine unit 1 according to Embodiment 2 will be described. The basic structure of the rotary electric machine unit according to this embodiment is the same as that of the rotary electric machine unit 1 according to Embodiment 1, and therefore the description will focus on the differences. Fig.23 It is a perspective view of the storage case 53A of the capacitor module 51 according to the present embodiment. Fig.24 is a cross-sectional view of the rotary electric machine unit 1 of the present embodiment, taken along Figure 8 A cross-sectional view of line EE.

[0212] like Fig.23 As shown, the storage shell 53A has a main body 531 and a plurality of pressing members 532 fixed to the main body 531. The pressing members 532 are arranged on the radially inner surface of the main body 531. The pressing members 532 are elastic. The upper end of the pressing member 532 is fixed to the radially inner surface of the main body 531. A protrusion protruding toward the radial inner side is provided at the lower end of the pressing member 532. The material of the main body 531 and the pressing members 532 is, for example, resin. The main body 531 and the pressing members 532 are integrally formed. In addition, the pressing member 532 can also be installed on the radially inner surface of the main body 531 using an adhesive.

[0213] like Fig.24 As shown, the positive side cooled portion 54e and the negative side cooled portion 55e are arranged on the radial inner side of the pressing member 532. More specifically, the main body 531, the pressing member 532, the positive side cooled portion 54e or the negative side cooled portion 55e, the second heat dissipation member 45, and the base 42 (capacitor cooling portion 42e) are arranged in sequence from the radial outer side to the inner side. The lower end of the pressing member 532 abuts against the positive side cooled portion 54e and the negative side cooled portion 55e from the radial outer side. At this time, the lower end of the pressing member 532 is elastically deformed toward the radial outer side. The positive side cooled portion 54e and the negative side cooled portion 55e are pressed against the second heat dissipation member 45 by the elastic force of the pressing member 532.

[0214] As described above, in the present embodiment, the capacitor unit 34 includes the pressing member 532 for pressing the positive-side portion to be cooled 54e and the negative-side portion to be cooled 55e against the second heat sink 45. As a result, the close contact between the positive-side portion to be cooled 54e and the negative-side portion to be cooled 55e and the second heat sink 45 is improved, so that the cooling performance of the capacitor unit 34 can be improved, and the output of the rotating electrical machine unit 1 can be increased.

[0215] In addition, the technical scope of the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be added without departing from the gist of the present disclosure.

[0216] For example, the rotating electrical machine unit 1 may be a rotating electrical machine unit of a multi-phase drive type having six or more phases.

[0217] 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.

[0218] Hereinafter, each aspect of the present disclosure will be collectively described as a supplementary note.

[0219] (Note 1)

[0220] A rotating electrical machine unit comprising:

[0221] A rotating electric machine having a stator, a rotor that rotates around an axis relative to the stator, and a plurality of coils that are wound around the stator;

[0222] a power conversion device arranged in parallel with the rotating electrical machine in an axial direction along the axis of the rotor; and

[0223] A first cooling unit is formed with a first cooling flow path through which a refrigerant flows, and cools the power conversion device.

[0224] The power conversion device includes: a plurality of power modules electrically connected to the plurality of coils, respectively; and a capacitor unit electrically connected to the plurality of power modules.

[0225] The first cooling flow path comprises:

[0226] an inlet flow path to which the refrigerant is supplied;

[0227] a first flow path branched from the inlet flow path and formed at a position overlapping with a first group of power modules among the plurality of power modules when viewed from the axial direction;

[0228] a second flow path branched from the inlet flow path and formed at a position overlapping with a second group of power modules different from the first group of power modules among the plurality of power modules when viewed from the axial direction; and

[0229] an outlet flow path, at which the refrigerant from the first flow path and the second flow path merges and the refrigerant is discharged from the first cooling unit,

[0230] The capacitor unit is arranged to surround the first cooling portion from the outside in the radial direction.

[0231] (Note 2)

[0232] The rotating electrical machine unit according to Supplementary Note 1, wherein:

[0233] The plurality of power modules are arranged along a circumferential direction around the axis of the rotor.

[0234] 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.

[0235] (Note 3)

[0236] The rotating electrical machine unit according to Supplementary Note 1 or 2, wherein:

[0237] The rotating electrical machine unit further includes a second cooling portion, the second cooling portion forming a second cooling flow path through which a refrigerant flows, and cooling the rotating electrical machine.

[0238] The second cooling flow path has:

[0239] a communication flow path, which is in communication with the outlet flow path;

[0240] a third flow path branched from the communication flow path and extending from the communication flow path to one side in the circumferential direction;

[0241] a fourth flow path branched from the communication flow path and extending from the communication flow path to the other side in the circumferential direction; and

[0242] A discharge flow passage where the refrigerant from the third flow passage and the fourth flow passage merge and the refrigerant is discharged from the second cooling unit.

[0243] (Note 4)

[0244] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 3, wherein:

[0245] The first cooling unit has a plurality of heat sinks arranged in the first flow path or the second flow path.

[0246] The plurality of heat sinks are arranged at positions overlapping with the plurality of power modules when viewed from the axial direction.

[0247] (Note 5)

[0248] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 4, wherein:

[0249] The capacitor unit has a positive conductor and a negative conductor,

[0250] The positive electrode conductor has a positive electrode side cooled portion arranged radially inward of the capacitor unit.

[0251] The negative electrode conductor has a negative electrode side cooled portion arranged radially inward of the capacitor unit.

[0252] The first cooling portion includes a capacitor cooling portion that is disposed radially outside the first cooling portion and is thermally connected to the positive electrode side portion to be cooled and the negative electrode side portion to be cooled.

[0253] (Note 6)

[0254] The rotating electrical machine unit according to Supplementary Note 5, wherein:

[0255] The first cooling unit includes a capacitor heat dissipating member provided between the positive electrode side portion to be cooled, the negative electrode side portion to be cooled, and the capacitor cooling unit.

[0256] (Note 7)

[0257] The rotating electrical machine unit according to Supplementary Note 5 or 6, wherein:

[0258] The positive electrode conductor has a plurality of positive electrode side cooled portions as the positive electrode side cooled portions,

[0259] The negative electrode conductor has a plurality of negative electrode side cooled portions as the negative electrode side cooled portions,

[0260] The first cooling unit includes a plurality of capacitor cooling units as the capacitor cooling units.

[0261] (Note 8)

[0262] The rotating electrical machine unit according to any one of Supplementary Notes 1 to 7, wherein:

[0263] The capacitor unit includes a plurality of capacitor modules arranged in a circumferential direction.

[0264] (Note 9)

[0265] The rotating electrical machine unit according to Supplementary Note 8, wherein:

[0266] When viewed from the axial direction, the plurality of capacitor modules each have an arc shape.

[0267] At least a portion of the inlet flow path and at least a portion of the outlet flow path are disposed between the ends of the plurality of capacitor modules in the circumferential direction.

[0268] The outlet flow passage is arranged on the opposite side of the inlet flow passage in the radial direction across the axis of the rotor.

[0269] (Note 10)

[0270] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 9, wherein:

[0271] The power conversion device further includes a plurality of bus bars that respectively connect the plurality of power modules and the plurality of coils.

[0272] (Note 11)

[0273] The rotating electrical machine unit according to Supplementary Note 10, wherein:

[0274] The first cooling unit further includes: a plate on which the plurality of power modules are mounted; and a bus bar heat sink member provided between the plurality of bus bars and the plate.

[0275] (Note 12)

[0276] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 11, wherein:

[0277] A plurality of coil slots are formed in the first cooling unit, and the plurality of coils are respectively arranged in the plurality of coil slots.

[0278] The plurality of coil slots are filled with a filling material having thermal conductivity.

[0279] (Note 13)

[0280] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 12, wherein:

[0281] The rotating electrical machine further includes a rotary transformer disposed between the stator and the power module and detecting a rotation angle of a shaft disposed at the center of the rotor.

[0282] A penetration hole through which the signal line of the resolver is inserted is formed in a central portion of the first cooling portion.

[0283] (Note 14)

[0284] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 13, wherein:

[0285] The capacitor unit has a positive conductor and a negative conductor,

[0286] The plurality of power modules respectively have a positive terminal connected to the positive conductor and a negative terminal connected to the negative conductor.

[0287] A length of a first path from the positive conductor via the positive terminal and the negative terminal of a first power module among the plurality of power modules to the negative conductor is substantially the same as a length of a second path from the positive conductor via the positive terminal and the negative terminal of a second power module among the plurality of power modules to the negative conductor.

[0288] (Note 15)

[0289] The rotating electrical machine unit according to Supplementary Note 14, wherein:

[0290] In the plurality of power modules, lengths of paths from the positive electrode conductor through the positive electrode terminal and the negative electrode terminal to the negative electrode conductor are all substantially the same.

[0291] (Note 16)

[0292] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 15, wherein:

[0293] The first cooling unit is arranged on the rotating electrical machine side relative to the plurality of power modules in the axial direction.

[0294] (Note 17)

[0295] A rotating electrical machine unit according to any one of Supplementary Notes 1 to 16, wherein:

[0296] The capacitor unit and the first cooling portion are opposed to each other in a radial direction.

[0297] (Note 18)

[0298] The rotating electrical machine unit according to Supplementary Note 6 or 7, wherein:

[0299] The capacitor unit includes a pressing member that presses the positive electrode side portion to be cooled and the negative electrode side portion to be cooled against the capacitor heat dissipating member.

[0300] Description of symbols

[0301] 1: Rotating motor unit;

[0302] 2: Rotating motor;

[0303] 3: Power conversion device;

[0304] 21: stator;

[0305] 22: rotor;

[0306] 23: axis;

[0307] 25: coil;

[0308] 27: Rotary transformer;

[0309] 34: capacitor unit;

[0310] 35: Power module;

[0311] 35b: positive terminal;

[0312] 35c: negative terminal;

[0313] 37: bus bar;

[0314] 41: board;

[0315] 41c: heat sink;

[0316] 42: base;

[0317] 42c: coil slot portion;

[0318] 42e: capacitor cooling unit;

[0319] 44: a first heat dissipation component (a busbar heat dissipation component);

[0320] 45: second heat dissipation component (capacitor heat dissipation component);

[0321] 51: capacitor module;

[0322] 54: positive conductor;

[0323] 54e: anode side cooled portion;

[0324] 55: negative electrode conductor;

[0325] 55e: Negative electrode side cooled portion;

[0326] 65: second cooling section;

[0327] 532: pressing component;

[0328] O: axis;

[0329] P1: inlet flow path;

[0330] P2: first flow path;

[0331] P3: second flow path;

[0332] P4: outlet flow path;

[0333] P5: connecting flow path;

[0334] P6: third flow path;

[0335] P7: fourth flow path;

[0336] P8: Discharge flow path.

Claims

1. A rotating electrical machine unit comprising: A rotating electric machine having a stator, a rotor that rotates around an axis relative to the stator, and a plurality of coils that are wound around the stator; A power conversion device arranged in parallel with the rotating electrical machine in an axial direction along the axis of the rotor; as well as A first cooling unit is formed with a first cooling flow path through which a refrigerant flows, and cools the power conversion device. The power conversion device includes: a plurality of power modules electrically connected to the plurality of coils, respectively; and a capacitor unit electrically connected to the plurality of power modules. The first cooling flow path comprises: an inlet flow path to which the refrigerant is supplied; a first flow path branched from the inlet flow path and formed at a position overlapping with a first group of power modules among the plurality of power modules when viewed from the axial direction; a second flow path branched from the inlet flow path and formed at a position overlapping with a second group of power modules different from the first group of power modules among the plurality of power modules when viewed from the axial direction; as well as an outlet flow path, at which the refrigerant from the first flow path and the second flow path merges and the refrigerant is discharged from the first cooling unit, The capacitor unit is arranged to surround the first cooling portion from the outside in the radial direction.

2. The rotating electrical machine unit according to claim 1, wherein: The plurality of power modules are arranged along a circumferential direction around the axis of the rotor. 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.

3. The rotating electrical machine unit according to claim 1 or 2, wherein: The rotating electrical machine unit further includes a second cooling portion, the second cooling portion forming a second cooling flow path through which a refrigerant flows, and cooling the rotating electrical machine. The second cooling flow path has: a communication flow path, which is in communication with the outlet flow path; a third flow path branched from the communication flow path and extending from the communication flow path to one side in the circumferential direction; a fourth flow path branched from the communication flow path and extending from the communication flow path to the other side in the circumferential direction; as well as A discharge flow passage where the refrigerant from the third flow passage and the fourth flow passage merge and the refrigerant is discharged from the second cooling unit.

4. The rotating electrical machine unit according to claim 1 or 2, wherein: The first cooling unit has a plurality of heat sinks arranged in the first flow path or the second flow path. The plurality of heat sinks are arranged at positions overlapping with the plurality of power modules when viewed from the axial direction.

5. The rotating electrical machine unit according to claim 1, wherein: The capacitor unit has a positive conductor and a negative conductor, The positive electrode conductor has a positive electrode side cooled portion arranged radially inward of the capacitor unit. The negative electrode conductor has a negative electrode side cooled portion arranged radially inward of the capacitor unit. The first cooling portion includes a capacitor cooling portion that is disposed radially outside the first cooling portion and is thermally connected to the positive electrode side portion to be cooled and the negative electrode side portion to be cooled.

6. The rotating electrical machine unit according to claim 5, wherein: The first cooling unit includes a capacitor heat dissipating member provided between the positive electrode side portion to be cooled, the negative electrode side portion to be cooled, and the capacitor cooling unit.

7. The rotating electrical machine unit according to claim 5 or 6, wherein: The positive electrode conductor has a plurality of positive electrode side cooled portions as the positive electrode side cooled portions, The negative electrode conductor has a plurality of negative electrode side cooled portions as the negative electrode side cooled portions, The first cooling unit includes a plurality of capacitor cooling units as the capacitor cooling units.

8. The rotating electrical machine unit according to claim 1 or 2, wherein: The capacitor unit includes a plurality of capacitor modules arranged in a circumferential direction.

9. The rotating electrical machine unit according to claim 8, wherein: When viewed from the axial direction, the plurality of capacitor modules each have an arc shape. At least a portion of the inlet flow path and at least a portion of the outlet flow path are disposed between the ends of the plurality of capacitor modules in the circumferential direction. The outlet flow passage is arranged on the opposite side of the inlet flow passage in the radial direction across the axis of the rotor.

10. The rotating electrical 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 on which the plurality of power modules are mounted; and a bus bar heat sink member provided between the plurality of bus bars and the plate.

12. The rotating electrical machine unit according to claim 1 or 2, wherein: A plurality of coil slots are formed in the first cooling unit, and the plurality of coils are respectively arranged in the plurality of coil slots. The plurality of coil slots are filled with a filling material having thermal conductivity.

13. The rotating electrical machine unit according to claim 1 or 2, wherein: The rotating electrical machine further includes a rotary transformer disposed between the stator and the power module and detecting a rotation angle of a shaft disposed at the center of the rotor. A penetration hole through which the signal line of the resolver is inserted is formed in a central portion of the first cooling portion.

14. The rotating electrical machine unit according to claim 1 or 2, wherein: The capacitor unit has a positive conductor and a negative conductor, The plurality of power modules respectively have a positive terminal connected to the positive conductor and a negative terminal connected to the negative conductor. A length of a first path from the positive conductor via the positive terminal and the negative terminal of a first power module among the plurality of power modules to the negative conductor is substantially the same as a length of a second path from the positive conductor via the positive terminal and the negative terminal of a second power module among the plurality of power modules to the negative conductor.

15. The rotating electric machine unit according to claim 14, wherein: In the plurality of power modules, lengths of paths from the positive electrode conductor through the positive electrode terminal and the negative electrode terminal to the negative electrode conductor are all substantially the same.

16. The rotating electrical machine unit according to claim 1 or 2, wherein: The first cooling unit is arranged on the rotating electrical machine side relative to the plurality of power modules in the axial direction.

17. The rotating electrical machine unit according to claim 1 or 2, wherein: The capacitor unit and the first cooling portion are opposed to each other in a radial direction.

18. The rotating electric machine unit according to claim 6, wherein: The capacitor unit includes a pressing member that presses the positive electrode side portion to be cooled and the negative electrode side portion to be cooled against the capacitor heat dissipating member.

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