Rotating Electrical Machine System

Abstract

This invention provides a compact rotating electric machine system by reducing its size in the radial direction without increasing its size in the axial direction. [Solution] The electrical components 16 of the rotating electric machine system include a plurality of capacitors 38 and a plurality of power modules 40. The first main surface 381 of each capacitor 38 and the second main surface 401 of each power module 40 are arranged such that the normal directions of the first main surface 381 and the second main surface 401 surround the rotation axis along the radial direction of the rotation axis. At least a portion of the axial positions of the capacitors 38 and the axial positions of the power modules 40 overlap each other.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a rotating electrical machine system. BACKGROUND ART

[0002] Japanese Patent No. 7202979 discloses a rotating electrical machine system. The rotating electrical machine system is an outer rotor type rotating electrical machine, and includes a rotor, a stator, and an inverter unit. The inverter unit includes a cylindrical inverter housing, and a plurality of capacitors and a plurality of power modules are annularly arranged inside the inverter housing. Inside the plurality of annularly arranged capacitors and the plurality of power modules, a space portion for accommodating the rotation shaft of the rotor is provided. The plurality of capacitors and the plurality of power modules are placed "flat" and fixed inside the inverter housing on a plane orthogonal to the axial direction of the rotation shaft of the rotor such that the main surfaces of the elements are parallel to the plane.

[0003] When each of the plurality of capacitors and the plurality of power modules is placed flat, the area of the main surface of the capacitor or the power module is generally larger than the area of the side surface. Therefore, it is necessary to secure a large area for the plane, and in conjunction with the increase in the radial size of the inverter housing, there is a problem that the rotating electrical machine system increases in size in the radial direction of the rotation shaft.

[0004] Japanese Patent Publication No. 3559909 discloses a rotating electric machine system. The rotating electric machine system comprises a plurality of capacitors arranged in a circumferential direction and a plurality of power modules arranged in a circumferential direction, wherein the plurality of capacitors and power modules are arranged in a axial direction of the rotating electric machine. The plurality of capacitors and power modules are arranged "vertically" on the circumference of a circle centered on the rotation axis, such that the direction of the normal of their main surfaces is aligned with the radial direction of the rotation axis. When the plurality of capacitors and power modules are arranged vertically, the radial size of the rotating electric machine can be suppressed, but there is a problem that the rotating electric machine system becomes larger in the axial direction of the rotation axis because the capacitors and power modules are arranged so that they do not overlap in the axial direction of the rotation axis. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 7202979

[0006] [Patent Document 2] Patent No. 3559909 [Overview of the project] [Problems that the invention aims to solve]

[0007] This disclosure aims to solve the problems described above. [Means for solving the problem]

[0008] A first aspect of the present disclosure is a rotating electric machine system comprising a rotating electric machine having a rotor with a rotating shaft and driven by alternating current power, and an electrical component that converts direct current power to alternating current power, wherein the electrical component comprises a plurality of capacitors and a plurality of power modules, each of the plurality of power modules and the plurality of capacitors having a main surface and a side surface intersecting the main surface and having a smaller area than the main surface, and the capacitors and power modules are arranged such that the direction normal to the main surface is along the radial direction of the rotating shaft and surrounds the rotating shaft, and at least a portion of the axial positions of the rotating shaft overlap each other.

[0009] A second aspect of the present disclosure is a rotating electric machine system comprising a rotating electric machine having a rotor with a rotating shaft and driven by alternating current power, and an electrical component that converts direct current power to alternating current power, wherein the electrical component comprises a plurality of capacitors and a plurality of power modules, each of the plurality of power modules and the plurality of capacitors is arranged such that the radial projection area is maximized among the radial projection area, axial projection area and circumferential projection area, and the capacitors and power modules are arranged to surround the rotating shaft and are arranged such that at least a portion of the axial position of the rotating shaft overlaps with each other. [Effects of the Invention]

[0010] According to this disclosure, by arranging multiple capacitors and multiple power modules in a vertical orientation along the axis by surrounding the rotation axis, and by overlapping the axial positions of the capacitors and power modules at least partially, the rotating electric machine system can be miniaturized radially without increasing its size in the axial direction. As a result, a compact rotating electric machine system can be provided. Furthermore, even if a space is provided inside the rotating electric machine system, the radial and axial enlargement of the rotating electric machine system is effectively suppressed. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 is an overall cross-sectional view of a rotating electric machine system according to an embodiment of the present disclosure. [Figure 2] Figure 2 is a plan view showing the cooling structure of a rotating electric machine. [Figure 3] Figure 3 is a cross-sectional view along the line III-III in Figure 1. [Figure 4] Figure 4 is a perspective cross-sectional view of the rotating electric machine shown in Figure 1. [Figure 5] Figure 5 is an enlarged cross-sectional view showing the thermal insulation structure of a rotating electric machine. [Figure 6] Figure 6 is a diagram showing the cooling system for a rotating electric machine system. [Figure 7] Figure 7 is a plan view of a modified rotating electric machine. [Modes for carrying out the invention]

[0012] As shown in Figure 1, the rotating electric machine system 10 according to this embodiment is used, for example, as a power source for propulsion of a mobile body. An example of a mobile body on which the rotating electric machine system 10 is mounted is an electric vertical take-off and landing aircraft (also known as an eVTOL aircraft), which is not shown. The following describes the case in which the rotating electric machine system 10 is used as a power source for an electric vertical take-off and landing aircraft.

[0013] The rotating electric machine system 10 comprises a DC power supply 12, a rotating electric machine 14, electrical components 16, and a cooling structure 18. The DC power supply 12 is, for example, a battery. The DC power supply 12 supplies power to the coil 202 of the rotating electric machine 14 via the electrical components 16.

[0014] The rotating electric machine 14 is an electric motor driven by alternating current power. The rotating electric machine 14 is, for example, a multiphase AC motor (for example, a three-phase AC motor).

[0015] The rotating electric machine 14 comprises a stator 20, a rotor 22, and a case member 24. The rotating electric machine 14 is an outer rotor type rotating electric machine 14 in which at least a portion of the rotor 22 is arranged radially outward from the stator 20.

[0016] The stator 20 includes a stator core 201, coils 202 of respective phases, and a stator cover 203. The stator core 201 has a substantially cylindrical shape along the axial direction. The stator core 201 has a plurality of teeth (not shown) protruding outward in the radial direction. The coil 202 is disposed between each of the teeth. The stator cover 203 covers the outer side of the stator core 201.

[0017] The rotor 22 includes a rotor shaft 221, a rotor core 222, and a plurality of magnets 223. The rotor shaft 221 is composed of an inner cylindrical portion 26, an outer cylindrical portion 28, a connecting portion 30, and a rotor holding portion 32. Each of the inner cylindrical portion 26 and the outer cylindrical portion 28 has a substantially cylindrical shape along the axis C of the rotor 22. The inner cylindrical portion 26 is disposed radially inward of the outer cylindrical portion 28. The inner cylindrical portion 26 is rotatably supported on the inner peripheral portion 204 of the stator 20 by a pair of bearings 33. The outer cylindrical portion 28 is disposed outward of the inner cylindrical portion 26 in the radial direction. The connecting portion 30 radially connects the inner cylindrical portion 26 and the outer cylindrical portion 28. The rotor holding portion 32 protrudes upward from the connecting portion 30. For example, a propeller rotor 100 of an electric vertical takeoff and landing aircraft is attached to the upper part of the rotor holding portion 32.

[0018] A substantially cylindrical rotor core 222 is attached to the inner periphery of the outer cylindrical portion 28. A plurality of magnets 223 are attached to the inner periphery of the rotor core 222. The outer cylindrical portion 28 holds the rotor core 222 and the plurality of magnets 223. The plurality of magnets 223 are arranged so as to surround the outer peripheral portion of the stator 20.

[0019] The case member 24 includes a stator holding portion 241 and a cover portion 242. The stator holding portion 241 is formed in a cylindrical shape and holds the stator 20. The stator holding portion 241 is disposed radially inward of the stator 20. The stator holding portion 241 extends in the axial direction of the rotating electric machine 14. The stator holding portion 241 is provided between the stator 20 and the electrical component 16.

[0020] As shown in Figure 2, the stator holder 241 is provided with a plurality of holes 34. The plurality of holes 34 penetrate the stator holder 241 radially and are spaced apart from each other in the circumferential direction of the stator holder 241. The following describes the case in which there are three holes 34. Note that the number of holes 34 is not limited to three. The number of holes 34 may be two or less, or four or more. The plurality of holes 34 are provided near the upper end of the stator holder 241.

[0021] The cover portion 242 is formed in a substantially disc shape and is provided at the axial end of the stator holding portion 241. As shown in Figure 1, the cover portion 242 extends radially from the lower end of the stator holding portion 241. The cover portion 242 faces the electrical components 16 in the axial direction of the rotating electric machine 14. The cover portion 242 covers the lower end of the electrical components 16. The central part of the cover portion 242 is fixed to the inner circumference 204 of the stator 20.

[0022] The rotating electric machine 14 further comprises a plurality of first busbars 361 and a plurality of second busbars 362. Each of the plurality of first busbars 361 and second busbars 362 is part of the electrical component 16. Each of the plurality of first busbars 361 electrically connects the coils 202 of each phase in the stator 20 to the electrical component 16. Each first busbar 361 is provided at one end (upper end) of the electrical component 16 in the axial direction. Each first busbar 361 is electrically connected to each of the plurality of power modules 40 (see Figure 4).

[0023] The second busbar 362 electrically connects the DC power supply 12 and the electrical components 16. The second busbar 362 is located at the other end (lower end) of the electrical components 16 in the axial direction. The second busbar 362 is electrically connected to each of the multiple capacitors 38 and each of the multiple power modules 40. The first busbar 361 and the second busbar 362 are spaced apart in the axial direction of the rotating electric machine 14.

[0024] The electrical component 16 converts the DC power supplied from the DC power supply 12 into AC power and supplies it to the coils 202 of the rotating electric machine 14. Specifically, the DC power supply 12 supplies power to the coils 202 of the rotating electric machine 14 via the second busbar 362, the electrical component 16, and the first busbar 361. By periodically energizing the coils 202 of each phase, the rotor 22 rotates relative to the stator 20.

[0025] As shown in Figure 3, the electrical component 16 includes a plurality of conversion units 161. The plurality of conversion units 161 are provided radially inward of the stator holding portion 241 of the case member 24 (see Figure 1). The plurality of conversion units 161 are arranged in a circumferential direction along the stator holding portion 241 of the rotating electric machine 14. The plurality of conversion units 161 are arranged to surround the axis C of the rotor 22 (see Figure 1). The plurality of conversion units 161 are arranged radially outward with respect to the axis C of the rotor 22. The plurality of conversion units 161 are arranged radially inward of the stator 20. The case in which three conversion units 161 are provided will be described below.

[0026] Each of the multiple conversion units 161 is equipped with a capacitor 38 and a power module 40. That is, there are multiple (3) capacitors 38 and power modules 40. The following describes the case where there are 3 power modules 40 and 3 capacitors 38. Note that the number of capacitors 38 and power modules 40 is not limited to 3 each. For example, the number of capacitors 38 and power modules 40 may be 2 or 4 or more. Also, the number of power modules 40 and capacitors 38 is not limited to the same number. For example, the number of capacitors 38 may be an integer multiple of the number of power modules 40. The number of capacitors 38 does not have to be an integer multiple of the number of power modules 40.

[0027] The capacitor 38 smooths the AC power converted by the power module 40. In the circumferential direction of the rotating electric machine 14, the capacitor 38 is positioned alongside the power module 40. The capacitor 38 comprises a first main surface 381 and a first side surface 382. The first main surface 381 is the surface facing the thickness direction of the capacitor 38. The first main surface 381 is the widest surface of the capacitor 38. The first main surface 381 faces the radial direction of the rotating electric machine 14. That is, the normal direction of the first main surface 381 faces the radial direction. The first side surface 382 is perpendicular to the first main surface 381. The first side surface 382 is the surface along the thickness direction of the capacitor 38. The area of ​​the first side surface 382 is smaller than the area of ​​the first main surface 381. That is, the area of ​​the first main surface 381 is larger than the area of ​​the first side surface 382.

[0028] The capacitor 38 further has a first radial projection area, a first axial projection area, and a first circumferential projection area. The first radial projection area is the area when the capacitor 38 is projected from the radial direction of the rotating electric machine 14. The first axial projection area is the area when the capacitor 38 is projected from the axial direction of the rotation axis of the rotor 22. The first circumferential projection area is the area when the capacitor 38 is projected from the circumferential direction of the rotating electric machine 14.

[0029] The capacitor 38 is positioned such that its first radial projection area is maximized among its first radial projection area, first axial projection area, and first circumferential projection area. In other words, the capacitor 38 is positioned vertically along the axial direction of the rotor 22's rotation axis.

[0030] The power module 40 converts DC power to AC power. In the circumferential direction of the rotating electric machine 14, the power module 40 is arranged alongside the capacitor 38. The power module 40 comprises a second main surface 401 and a second side surface 402. The second main surface 401 is the surface facing the thickness direction of the power module 40, and is the widest surface of the power module 40. The second main surface 401 faces the radial direction of the rotating electric machine 14. That is, the normal direction of the second main surface 401 faces the radial direction. The second side surface 402 is perpendicular to the second main surface 401. The second side surface 402 is a surface along the thickness direction of the power module 40. The area of ​​the second side surface 402 is smaller than the area of ​​the second main surface 401. In other words, the area of ​​the second main surface 401 is larger than the area of ​​the second side surface 402.

[0031] The power module 40 further has a second radial projection area, a second axial projection area, and a second circumferential projection area. The second radial projection area is the area when the power module 40 is projected from the radial direction of the rotating electric machine 14. The second axial projection area is the area when the power module 40 is projected from the axial direction of the rotation axis of the rotor 22. The second circumferential projection area is the area when the power module 40 is projected from the circumferential direction of the rotating electric machine 14.

[0032] The power module 40 is positioned such that its second radial projection area is maximized among its second radial projection area, second axial projection area, and second circumferential projection area. In other words, the power module 40 is positioned vertically along the axial direction of the rotor 22's rotation axis.

[0033] In each conversion unit 161, the axial position of the capacitor 38 and the axial position of the power module 40 are arranged so that at least a portion of them overlap with each other in the axial direction of the rotor 22's rotation axis. The following description will focus on the case where the axial position of the capacitor 38 and the axial position of the power module 40 are the same and their axial positions completely overlap. However, the axial position of the capacitor 38 and the axial position of the power module 40 may be offset from each other in the axial direction of the rotation axis.

[0034] Each of the multiple conversion units 161 is arranged such that the normal direction of the first main surface 381 of the capacitor 38 is oriented radially, and the normal direction of the second main surface 401 of the power module 40 is oriented radially.

[0035] As shown in Figure 1, the electrical components 16 and the stator 20 are arranged spaced apart in the radial direction of the rotating electric machine 14. In the radial direction of the rotating electric machine 14, a stator holding section 241 is provided between a plurality of conversion units 161 and the stator 20. The electrical components 16 and the stator 20 are arranged in parallel to each other in the radial direction.

[0036] The cooling structure 18 cools the multiple conversion units 161 and the rotating electric machine 14.

[0037] As shown in Figure 3, the cooling structure 18 comprises a plurality of cooling jackets 42 and a refrigerant flow section 44. Each of the plurality of cooling jackets 42 cools each of the plurality of conversion units 161. Each cooling jacket 42 cools the condenser 38 and power module 40 of each conversion unit 161, respectively. The number of cooling jackets 42 is the same as the number of conversion units 161. The case in which there are three cooling jackets 42 will be described below. Each of the three cooling jackets 42 is provided for each of the three phases.

[0038] The cooling structure 18 may consist of multiple cooling jackets 42, each independently provided and spaced apart from the others, or it may have multiple cooling jackets 42 that form a single integrated jacket structure. In other words, it is sufficient that the multiple cooling jackets 42 and each phase conversion unit 161 are arranged in a corresponding manner.

[0039] The number of capacitors 38 and the number of power modules 40 in each cooling jacket 42 are the same. The following describes the case where each cooling jacket 42 has one capacitor 38 and one power module 40. Note that each cooling jacket 42 may have two or more capacitors 38 and two or more power modules 40. Also, the number of capacitors 38 and the number of power modules 40 in each cooling jacket 42 may be different.

[0040] As shown in Figure 2, the multiple cooling jackets 42 are arranged in a line in the circumferential direction of the rotating electric machine 14. The multiple conversion units 161 are arranged to surround the axis C of the rotor 22. Each of the multiple cooling jackets 42 is spaced apart from one another in the circumferential direction of the rotating electric machine 14. The multiple cooling jackets 42 are arranged radially inward of the stator holding portion 241 in the case member 24.

[0041] Each cooling jacket 42 includes a first mounting portion 421 and a second mounting portion 422. A capacitor 38 is mounted on the first mounting portion 421. As shown in Figure 3, the first mounting portion 421 has a housing chamber 46 in which the capacitor 38 is housed. The capacitor 38 is housed in the housing chamber 46 through an axially open end (not shown) of the first mounting portion 421. The first main surface 381 of the capacitor 38 is housed so as to face the radial direction of the rotating electric machine 14.

[0042] A power module 40 is attached to the second mounting portion 422. The second mounting portion 422 is adjacent to the first mounting portion 421 in the circumferential direction of the rotating electric machine 14. The second mounting portion 422 has a mounting surface 48 that faces radially outward. A power module 40 is attached to the mounting surface 48. In the circumferential direction of the rotating electric machine 14, the first mounting portion 421 and the second mounting portion 422 are connected to each other by a connecting portion 423. In a plan view of the rotating electric machine 14, the first mounting portion 421 and the second mounting portion 422 are inclined relative to each other with the connecting portion 423 as a pivot point. For example, the second mounting portion 422 is inclined with respect to the first mounting portion 421 within a range of 90° to 180°.

[0043] As shown in Figure 4, each cooling jacket 42 has a radial thickness T that is less than its axial length L of the rotor 22. The thickness direction of each cooling jacket 42 is normal to the first main surface 381 of the capacitor 38 and normal to the second main surface 401 of the power module 40 (see Figure 3). The length direction of each cooling jacket 42 is the direction of extension of the first main surface 381 and the second main surface 401 along the axial direction of the rotor 22.

[0044] As shown in Figure 2, in a plan view of the rotating electric machine 14, a plurality of cooling jackets 42, each having a first mounting portion 421 and a second mounting portion 422 that are inclined relative to each other, are arranged in a substantially annular shape. A plurality of conversion units 161 (a plurality of capacitors 38 and a plurality of power modules 40) are arranged between the plurality of cooling jackets 42 and the stator 20. A space S is provided radially inward of the plurality of conversion units 161. As shown in Figure 1, the space S extends in the axial direction of the rotating electric machine 14. In a plan view of the rotating electric machine 14, the space S is substantially circular in shape. The space S can accommodate auxiliary equipment 102 for controlling electric vertical take-off and landing aircraft, the inner cylinder portion 26 of the rotor shaft 221, and bearings 33, etc.

[0045] The configuration is not limited to one in which multiple conversion units 161 are provided between multiple cooling jackets 42 and the stator 20. For example, a configuration in which multiple cooling jackets 42 are provided between multiple conversion units 161 and the stator 20 is also possible. In this case, the conversion units 161 can be positioned further radially inward from the stator 20, which generates a large amount of heat.

[0046] As shown in Figure 4, refrigerant F flows through the refrigerant flow section 44. Refrigerant F is, for example, lubricating oil. The refrigerant flow section 44 includes a jacket flow path 50 and a stator cooling flow path 52. Note that refrigerant F is not limited to lubricating oil. For example, refrigerant F may be a liquid such as water.

[0047] The jacket flow path 50 is provided in each of the multiple cooling jackets 42. Each jacket flow path 50 comprises a first flow section 501 and a second flow section 502.

[0048] The first circulation section 501 cools the condenser 38. The first circulation section 501 is provided on the first mounting section 421. The first circulation section 501 includes a first jacket passage 541 through which the refrigerant F flows. The first jacket passage 541 extends in the width direction of the first mounting section 421, which is perpendicular to the thickness direction of the first mounting section 421 and the axial direction of the rotor 22. The first jacket passage 541 is positioned radially inward of the condenser 38 via the wall portion 431 of the first mounting section 421 (see Figure 3).

[0049] The second circulation section 502 cools the power module 40. The second circulation section 502 is provided on the second mounting section 422. The second circulation section 502 includes a second jacket passage 542 through which the refrigerant F flows. The second jacket passage 542 extends in the width direction of the second mounting section 422, which is perpendicular to the thickness direction of the second mounting section 422 and the axial direction of the rotor 22.

[0050] The second jacket passage 542 is positioned radially inward of the power module 40 via the wall portion 432 of the second mounting portion 422. At the connecting portion 423 of each cooling jacket 42, the first jacket passage 541 and the second jacket passage 542 are connected to each other and communicate (see Figure 3). In the flow direction of the refrigerant F, the second jacket passage 542 (second flow portion 502) is connected to the first jacket passage 541 (first flow portion 501) downstream of the first jacket passage 541 (first flow portion 501).

[0051] The jacket passage 50 further comprises a first connection portion 561 and a second connection portion 562. The first connection portion 561 is formed at the end of the first jacket passage 541. The first connection portion 561 is the upstream end of the first jacket passage 541 into which the refrigerant F is introduced. The first connection portion 561 is provided at the axial lower end of the first mounting portion 421. The first connection portion 561 faces the cover portion 242 of the case member 24.

[0052] The second connection portion 562 is formed at the end of the second jacket flow path 542. The second connection portion 562 is the downstream end of the second jacket flow path 542 from which the refrigerant F is discharged. The second connection portion 562 is provided on the radial outer surface of the second mounting portion 422. The second connection portion 562 is connected to each hole 34 of the stator holding portion 241.

[0053] A refrigerant F for cooling the rotating electric machine 14 flows through the stator cooling passage 52. The stator cooling passage 52 is surrounded by the stator holding part 241, the stator cover 203, and the cover part 242 of the case member 24. The stator cooling passage 52 is the space in which the stator 20 is housed. The stator cooling passage 52 is formed in an annular shape. The stator cooling passage 52 communicates with the second connection part 562 through each hole 34 of the stator holding part 241. The refrigerant F that has flowed through each of the multiple second jacket passages 542 flows to the stator cooling passage 52 through each second connection part 562, thereby cooling the stator 20. In other words, the refrigerant F flowing through the multiple second jacket passages 542 converges into one stator cooling passage 52.

[0054] As shown in Figure 1, the refrigerant flow section 44 further comprises a first flow path 581, a second flow path 582, an inlet 60, an outlet 62, and a heat insulating structure 64. The first flow path 581, the second flow path 582, the inlet 60, and the outlet 62 are provided in the cover portion 242 of the case member 24, respectively.

[0055] The first channel 581 is connected to the first jacket channel 541 of each cooling jacket 42. The first channel 581 is connected upstream of each first jacket channel 541. As shown in Figure 3, in a plan view of the cover portion 242, the first channel 581 is formed in an arc shape along the outer edge of the cover portion 242. The first channel 581 is connected to each of the first connection portions 561 of the plurality of first jacket channels 541 and communicates with each other. That is, each of the plurality of first jacket channels 541 is connected in parallel to one first channel 581. The refrigerant F flowing through the first channel 581 is supplied to each first jacket channel 541 almost simultaneously.

[0056] As shown in Figure 1, the second flow path 582 is connected to and communicates with the stator cooling flow path 52. The second flow path 582 is connected downstream of the stator cooling flow path 52. As shown in Figure 2, in a plan view of the cover portion 242, the second flow path 582 is formed in an arc shape along the outer edge of the cover portion 242. The first flow path 581 and the second flow path 582 are arranged spaced apart from each other in the radial direction of the cover portion 242. In the cover portion 242, the second flow path 582 is positioned radially outward from the first flow path 581. The refrigerant F that has flowed through the stator cooling flow path 52 is led out into the second flow path 582.

[0057] As shown in Figure 1, the introduction section 60 communicates with the first flow path 581 and the first circulation section 501, and refrigerant F is introduced from the outside. The introduction section 60 extends axially from the cover section 242. The introduction section 60 is connected to the upstream end of the first flow path 581. The introduction section 60 protrudes axially from the end of the cover section 242. A supply pipe 761, which will be described later, is connected to the introduction section 60.

[0058] The outlet section 62 communicates with the second flow path 582 and the second circulation section 502 to discharge the refrigerant F to the outside. The outlet section 62 is connected downstream of the stator cooling flow path 52 and each cooling jacket 42. The outlet section 62 extends axially from the cover section 242. The outlet section 62 is connected to the downstream end of the second flow path 582. The outlet section 62 protrudes axially from the end of the cover section 242. A discharge pipe 762, which will be described later, is connected to the outlet section 62, and the refrigerant F that has flowed through the refrigerant circulation section 44 is discharged.

[0059] As shown in Figure 5, the thermal insulation structure 64 comprises a first thermal insulation section 641 and a second thermal insulation section 642. The first thermal insulation section 641 is provided to provide thermal insulation between the refrigerant F flowing through the first flow path 581 and the cover section 242. The first thermal insulation section 641 is provided on the outer periphery of the first flow path 581. The first thermal insulation section 641 covers the outer periphery of the first flow path 581. The first thermal insulation section 641 extends along the first flow path 581. The first thermal insulation section 641 has a first thermal insulation space 661. The first thermal insulation space 661 is filled with a thermal insulation medium A.

[0060] The first flow path 581 is supported by the cover portion 242 via a first insulating space 661 by a support portion 68 extending radially outward. The insulating medium A is, for example, a gas such as air. However, the insulating medium A is not limited to a gas. For example, the insulating medium A may be a liquid. The insulating medium A in the first insulating space 661 suppresses heat exchange between the refrigerant F flowing through the first flow path 581 and the cover portion 242.

[0061] The second insulation section 642 is provided to provide insulation between the refrigerant F flowing through the second flow path 582 and the cover section 242. The second insulation section 642 is provided on the outer periphery of the second flow path 582. The second insulation section 642 covers the outer periphery of the second flow path 582. The second insulation section 642 extends along the second flow path 582. The second insulation section 642 has a second insulation space 662. The second insulation space 662 is filled with an insulating medium A. The insulating medium A in the second insulation space 662 is the same as the insulating medium A in the first insulation space 661. However, the insulating medium A in the second insulation space 662 and the insulating medium A in the first insulation space 661 may be different.

[0062] The second flow path 582 is supported by the cover portion 242 via a second insulating space 662 by a support portion 68 extending radially outward. The insulating medium A in the second insulating space 662 suppresses heat exchange between the refrigerant F flowing through the second flow path 582 and the cover portion 242. The first insulating portion 641 and the second insulating portion 642 suppress heat transfer between the refrigerant F flowing through the first flow path 581 and the refrigerant F flowing through the second flow path 582.

[0063] As shown in Figure 6, the rotating electric machine system 10 further includes a cooling system 70. The cooling system 70 circulates a refrigerant F to the cooling structure 18. The cooling system 70 comprises a tank 72, a pump device 74, piping 76, and a heat exchanger 78. The cooling system 70 is installed, for example, below the rotating electric machine 14. The tank 72 stores the refrigerant F. The pump device 74 is driven by power supplied from a DC power supply 12 (see Figure 1). When the pump device 74 is driven, the refrigerant F in the tank 72 is supplied to the cooling structure 18 through the piping 76.

[0064] The piping 76 comprises a supply pipe 761 and a discharge pipe 762. The supply pipe 761 is connected to the downstream side of the pump device 74. The supply pipe 761 is for supplying the refrigerant F stored in the tank 72 to the cooling structure 18. The supply pipe 761 is connected to the inlet 60 of the cooling structure 18. The discharge pipe 762 is for returning the refrigerant F used for cooling in the cooling structure 18 back to the tank 72. The discharge pipe 762 is connected to the outlet 62 of the cooling structure 18.

[0065] The heat exchanger 78 is positioned between the tank 72 and the cooling structure 18. The heat exchanger 78 is, for example, a radiator. The heat exchanger 78 is connected to a supply pipe 761 and a discharge pipe 762. The refrigerant F heated in the cooling structure 18 is introduced into the heat exchanger 78 through the discharge pipe 762. After the heat exchanger 78 dissipates the heat from the heated refrigerant F, it is supplied back to the cooling structure 18 via the supply pipe 761.

[0066] Next, the cooling of the rotating electric machine system 10 will be described.

[0067] When the pump device 74 is driven, the refrigerant F in the tank 72 is drawn in via the piping 76 and supplied to the inlet 60 of the rotating electric machine 14 via the heat exchanger 78. As shown in Figure 4, the refrigerant F is supplied from the inlet 60 through the first flow path 581 to multiple cooling jackets 42, thereby cooling multiple conversion units 161 (condensers 38 and power modules 40). Specifically, the refrigerant F is supplied to each of the first jacket flow paths 541 of the multiple cooling jackets 42. At this time, the refrigerant F is supplied to each of the three cooling jackets 42 almost simultaneously (see Figure 6). The refrigerant F flowing through each first jacket flow path 541 cools the condenser 38 of each conversion unit 161. Specifically, as shown in Figure 3, heat exchange takes place between the refrigerant F and the condenser 38 via the first mounting part 421. While the condenser 38 is cooled, the refrigerant F is heated.

[0068] Refrigerant F flows from each first jacket passage 541 to each second jacket passage 542. The power module 40 of each conversion unit 161 is cooled by the refrigerant F flowing through each second jacket passage 542. Specifically, heat exchange occurs between the refrigerant F and the power module 40 via the second mounting portion 422. While the power module 40 is cooled, the refrigerant F is heated.

[0069] Next, the stator 20 of the rotating electric machine 14 is cooled by the refrigerant F. Specifically, as shown in Figure 4, the refrigerant F flows from each second jacket passage 542 through the second connection part 562 to the stator cooling passage 52. The refrigerant F from each cooling jacket 42 collects in the stator cooling passage 52 through the second connection part 562 (see Figure 6). At this time, the refrigerant F is supplied to the stator cooling passage 52 evenly in the circumferential direction by a plurality of holes 34 that are spaced apart from each other in the circumferential direction (see Figure 3).

[0070] Within the stator cooling channel 52, the refrigerant F flows downwards toward the stator 20. When the refrigerant F comes into contact with the stator 20, heat exchange occurs between the refrigerant F and the stator 20, cooling the stator 20. From the bottom of the stator cooling channel 52, the refrigerant F flows into the second channel 582 and is discharged to the outside through the outlet section 62.

[0071] As shown in Figure 6, the refrigerant F flows from the outlet 62 through the discharge pipe 762 to the heat exchanger 78, where the heat of the refrigerant F is dissipated. After heat dissipation in the heat exchanger 78, the refrigerant F circulates through the supply pipe 761 to the cooling structure 18 of the rotating electric machine 14.

[0072] This embodiment provides the following effects.

[0073] As shown in Figure 3, the rotating electric machine system 10 includes an electrical component 16 that converts DC power to AC power, and the electrical component 16 has a plurality of capacitors 38 and a plurality of power modules 40. The normal directions of the first main surface 381 of the capacitors 38 and the second main surface 401 of the power modules 40 are oriented radially, and they are arranged circumferentially so as to surround the axis C of the rotor shaft 221 of the rotor 22. At least a portion of the axial positions of the capacitors 38 and power modules 40 are arranged to overlap each other.

[0074] According to this rotating electric machine system 10, by arranging multiple capacitors 38 and multiple power modules 40 around the rotation axis of the rotor 22, they are positioned vertically along the direction of the rotation axis, and by overlapping the positions of the capacitors 38 and power modules 40 in each axial direction at least partially, the rotating electric machine system 10 can be made smaller in the radial direction without increasing its size in the axial direction.

[0075] As a result, the entire rotating electric machine system 10 can be made compact. By suppressing the axial enlargement of the rotating electric machine 14, axial strength can be effectively ensured. Furthermore, even when a space S is provided inside the rotating electric machine system 10, the radial and axial enlargement of the rotating electric machine system 10 is effectively suppressed.

[0076] As shown in Figure 4, in the conversion unit 161, the capacitor 38 and the power module 40 are arranged in a circumferential direction. This configuration makes it possible to more effectively suppress the axial increase in size of the rotating electric machine system 10.

[0077] As shown in Figure 4, the system includes multiple cooling jackets 42 for cooling each of the multiple conversion units 161, and each of the multiple cooling jackets 42 has a first jacket passage 541 and a second jacket passage 542 through which the refrigerant F flows. Each of the multiple cooling jackets 42 has a thickness T along the direction normal to the first main surface 381 of the condenser 38 and the second main surface 401 of the power module 40 that is smaller than the length L along the axial direction of the rotor 22.

[0078] With this configuration, in addition to the conversion unit 161, the cooling jacket 42 is positioned vertically along the axial direction, which effectively suppresses the radial enlargement of the rotating electric machine system 10. Cooling efficiency can be improved by increasing the contact area between the capacitor 38 and power module 40 and the cooling jacket 42 in the axial direction of the rotating electric machine 14.

[0079] As shown in Figure 3, each of the multiple cooling jackets 42 is provided for each of the three phases (multiphase).

[0080] With this configuration, multiple cooling jackets 42 are provided for each of the three phases (multi-phase), allowing the capacitors 38 and power modules 40 to be cooled in each phase. Therefore, the conversion units 161 in each phase can be cooled uniformly. In addition, variations in cooling among the three phases can be effectively suppressed.

[0081] Each of the multiple cooling jackets 42 comprises one condenser 38 and one power module 40. The jacket flow path 50 of the refrigerant flow section 44 comprises a first flow section 501 for cooling the condenser 38 and a second flow section 502 for cooling the power module 40.

[0082] This configuration effectively improves the cooling efficiency of the conversion unit 161 by cooling the condenser 38, which generates less heat, with the refrigerant F before the power module 40, thereby maintaining uniform cooling of both the condenser 38 and the power module 40. Furthermore, it allows for uniform cooling of each of the multiple cooling jackets 42.

[0083] The capacitor 38 and the power module 40 are arranged alternately along the circumferential direction of the rotating electric machine 14. This configuration makes it possible to equalize the amount of heat generated in the circumferential direction of the rotating electric machine 14.

[0084] Each of the multiple cooling jackets 42 is spaced apart from the others in the circumferential direction. With this configuration, by spacing out each cooling jacket 42, the thermal influence of adjacent cooling jackets 42 can be effectively suppressed. The space between the multiple cooling jackets 42 can be effectively utilized.

[0085] As shown in Figure 2, the stator 20 and the electrical components 16 are arranged in parallel to each other, spaced apart in the radial direction. With this configuration, the rotating electric machine system 10 can be made smaller in the axial direction by arranging the stator 20 and the electrical components 16 in a radial direction. The transfer of heat generated in the stator 20 to the electrical components 16 can be effectively suppressed.

[0086] As shown in Figure 2, the case member 24 has a plurality of holes 34 that penetrate radially and are spaced apart from each other in the circumferential direction. The jacket flow path 50 includes a first connecting portion 561 provided at the upstream end and a second connecting portion 562 provided at the downstream end and connected to the holes 34. The refrigerant F flowing through each of the plurality of jacket flow paths 50 flows to the stator 20 side through the holes 34.

[0087] With this configuration, the cooling circuits of the electrical components 16 and the stator 20 can be connected in series via the cooling jacket 42, effectively separating the cooling path of the electrical components 16 from the cooling path of the stator 20. As a result, multiple electrical components 16 can be cooled uniformly, further increasing cooling efficiency. In addition, the cooling efficiency can be increased by uniformly cooling the stator 20 in the circumferential direction with multiple holes 34. Furthermore, by connecting the cooling jacket 42 and the stator holding part 241 in the radial direction, the radial size can be reduced.

[0088] As shown in Figure 1, the case member 24 includes a cover portion 242 that faces the electrical components 16 in the axial direction. The cover portion 242 includes a first flow path 581 connected to the upstream end through which the refrigerant F flows, and an introduction portion 60 that communicates with the first flow path 581 and the first jacket flow path 541 and through which the refrigerant F is introduced.

[0089] With this configuration, the cover portion 242 for supplying refrigerant F to the cooling jacket 42 from the outside does not overlap with the electrical components 16 in the radial direction, thus allowing the rotating electric machine system 10 to be further miniaturized in the radial direction.

[0090] As shown in Figure 5, each of the first channel 581 and the second channel 582 has a first insulating space 661 and a second insulating space 662 filled with insulating medium A between them and the cover portion 242, and the first channel 581 and the second channel 582 are insulated from each other by the first insulating space 661 and the second insulating space 662.

[0091] With this configuration, the first channel 581 through which the introduced (low-temperature) refrigerant F flows and the second channel 582 through which the (high-temperature) refrigerant F used for cooling flows each have a first insulated space 661 and a second insulated space 662, respectively. The insulated media A in the first insulated space 661 and the second insulated space 662 effectively suppress the transfer of heat from the refrigerant F in the second channel 582 to the refrigerant F in the first channel 581. Therefore, the cooling efficiency of the conversion unit 161 can be increased. In addition, by providing the first channel 581 and the second channel 582 in the cover portion 242, the rotating electric machine 14 can be made smaller in the radial direction.

[0092] The rotating electric machine 14 is an outer rotor type rotating electric machine 14 in which at least a portion of the rotor 22 is positioned radially outward from the stator 20. Multiple conversion units 161 are positioned radially inward from the stator 20, and multiple capacitors 38 and multiple power modules 40 are positioned between the stator 20 and the cooling jacket 42.

[0093] With this configuration, the electrical components 16 can be installed using the space S in the radial direction of the stator 20, thus enabling miniaturization of the rotating electric machine system 10 in both the axial and radial directions. By positioning the cooling jacket 42 away from the stator 20, which generates a large amount of heat, the thermal influence of the stator 20 on the cooling jacket 42 can be effectively suppressed.

[0094] The rotating electric machine 14 includes a first busbar 361 that electrically connects the stator 20 and the electrical components 16, and a second busbar 362 that electrically connects the DC power supply 12 and the electrical components 16. The first busbar 361 and the second busbar 362 are spaced apart in the axial direction of the rotating electric machine 14. The first busbar 361 is provided at one end of the electrical components 16 in the axial direction, and the second busbar 362 is provided at the other end of the electrical components 16 in the axial direction.

[0095] This configuration allows for a reduction in the radial size of the rotating electric machine 14. Furthermore, by arranging the first busbar 361 and the second busbar 362 with the electrical components 16 in between, the electrical path can be efficiently managed, resulting in a rotating electric machine 14 with a good balance of electrical and thermal characteristics.

[0096] In the rotating electric machine system 10, each of the multiple power modules 40 and multiple capacitors 38 is arranged such that its radial projection area is maximized among its radial projection area (first radial projection area, second radial projection area), axial projection area (first axial projection area, second axial projection area), and circumferential projection area (first circumferential projection area, second circumferential projection area).

[0097] With this configuration, each of the multiple capacitors 38 and the multiple power modules 40 is arranged vertically along the axis direction by arranging them so that their radial projected area (first radial projected area, second radial projected area) is maximized, and the axial positions of the power modules 40 and capacitors 38 are at least partially overlapped, thereby making the rotating electric machine system 10 smaller in the radial direction without increasing its size in the axial direction.

[0098] The electrical component 16 is not limited to a configuration in which each of the multiple capacitors 38 and each of the multiple power modules 40 are arranged in a circumferential direction. For example, as shown in Figure 7, in the rotating electric machine system 10A, each of the multiple capacitors 38 and each of the multiple power modules 40 constituting the electrical component 16A are arranged in a radial direction. The cooling structure 18A (cooling jacket 42A) is placed between each capacitor 38 and each power module 40.

[0099] According to the modified rotating electric machine system 10A, the electrical components 16A can be compactly arranged in the radial direction of the rotating electric machine 14A. Furthermore, in a plan view of the rotating electric machine 14A, if the three-phase electrical components 16A can be arranged in the semicircular portion of the case member 24, it is also possible to arrange additional three-phase electrical components in the remaining semicircular portion.

[0100] The rotating electric machine 14 is not limited to an outer rotor type. For example, the rotating electric machine system may be configured to include an inner rotor type rotating electric machine in which the rotor is arranged radially inward of the stator. In an inner rotor type rotating electric machine, multiple cooling jackets are arranged between multiple conversion units (capacitors and power modules) and the rotor. In this configuration, cooling jackets can be placed between the stator, which generates a large amount of heat, and the conversion units, which generate less heat relative to the stator, so that the thermal influence from the stator to the conversion units is effectively suppressed.

[0101] In addition to the disclosures mentioned above, the following further notes are made:

[0102] (Note 1) The rotating electric machine system (10) includes a rotating electric machine (14) having a rotor (22) with a rotating shaft and driven by AC power, and an electrical component (16) that converts DC power to AC power, wherein the electrical component comprises a plurality of capacitors (38) and a plurality of power modules (40), and each of the power modules and capacitors has a main surface (381, 401) and a side surface (382, 402) that intersects the main surface and has a smaller area than the main surface, and the capacitors and power modules are arranged such that the direction normal to the main surface is along the radial direction of the rotating shaft and surrounds the rotating shaft, and at least a portion of the axial position of the rotating shaft overlaps with each other.

[0103] This configuration allows for a compact overall structure of the rotating electric machine system 10. By suppressing the axial increase in size of the rotating electric machine 14, axial strength can be effectively ensured. Furthermore, even when a space S is provided inside the rotating electric machine system 10, the radial and axial increases in size of the rotating electric machine system 10 are effectively suppressed.

[0104] (Note 2) In the rotating electric machine system described in Appendix 1, the capacitor and the power module may be arranged side by side in the circumferential direction. With this configuration, the axial increase in size of the rotating electric machine system 10 can be suppressed even more effectively.

[0105] (Note 3) In the rotating electric machine system described in Appendix 1, the electrical components include a plurality of conversion units (161) each comprising the capacitor and the power module, and a plurality of cooling jackets (42) for cooling each of the plurality of conversion units, each of the plurality of cooling jackets having a jacket passage (541, 542) through which a refrigerant (F) flows, and each of the plurality of cooling jackets may have a thickness (T) along the normal direction of the main surface of the main surface that is smaller than the length (L) along the axial direction of the rotor.

[0106] With this configuration, in addition to the conversion unit, the cooling jacket is positioned vertically along the axial direction, which effectively suppresses the radial enlargement of the rotating electric machine system. Cooling efficiency can be improved by increasing the contact area between the capacitor and power module and the cooling jacket in the axial direction of the rotating electric machine.

[0107] (Note 4) In the rotating electric machine system described in Appendix 3, each of the multiple cooling jackets may be provided for each of the multiple phases.

[0108] With this configuration, multiple cooling jackets are provided for each phase, allowing for the cooling of capacitors and power modules in each phase. Therefore, the conversion units in each phase can be cooled uniformly. Furthermore, variations in cooling across phases can be effectively suppressed.

[0109] (Note 5) In the rotating electric machine system described in Appendix 4, each of the plurality of cooling jackets comprises one condenser and one power module, and the jacket flow path may comprise a first flow section (501) for cooling the condenser and a second flow section (502) connected to the first flow section downstream of the first flow section in the direction of refrigerant flow and for cooling the power module.

[0110] With this configuration, cooling the capacitors, which generate less heat, with a refrigerant effectively increases the cooling efficiency in the conversion unit and maintains uniform cooling of the capacitors and power modules. Furthermore, it is possible to maintain a uniform degree of cooling for each of the multiple cooling jackets.

[0111] (Note 6) In the rotating electric machine system described in Appendix 5, the capacitor and the power module may be arranged alternately along the circumferential direction of the rotating electric machine. With such a configuration, the amount of heat generated in the circumferential direction of the rotating electric machine can be made uniform.

[0112] (Note 7) In the rotating electric machine system described in Appendix 4, each of the multiple cooling jackets may be spaced apart from one another in the circumferential direction.

[0113] With this configuration, by separating each cooling jacket from one another, the thermal influence between adjacent cooling jackets can be effectively suppressed. The space between multiple cooling jackets can also be effectively utilized.

[0114] (Note 8) In the rotating electric machine system described in any one of appendices 3 to 7, the rotating electric machine includes a stator (20), and the stator and the electrical components may be spaced apart in the radial direction and placed in parallel with each other.

[0115] With this configuration, the stator and electrical components can be arranged radially, allowing the rotating electric machine system to be miniaturized in the axial direction. This also effectively suppresses the transfer of heat generated by the stator to the electrical components.

[0116] (Note 9) In the rotating electric machine system described in Appendix 8, the system has a cylindrical case member (24) that holds the stator, the case member is provided between the stator and the electrical components, the case member has a plurality of holes (34) that penetrate in the radial direction and are spaced apart from each other in the circumferential direction, the jacket passage has an upstream end and a downstream end in the direction of refrigerant flow, a first connection part (561) provided at the upstream end and a second connection part (562) formed at the downstream end and connected to the holes, and the refrigerant flowing through each of the plurality of jacket passages may flow to the stator side through the holes.

[0117] With this configuration, the cooling circuits of the electrical components and the stator are connected in series via a cooling jacket, effectively separating the cooling paths of the electrical components and the stator. As a result, multiple electrical components can be cooled uniformly, further increasing cooling efficiency. In addition, the stator can be cooled uniformly in the circumferential direction by multiple holes, thereby increasing cooling efficiency. Furthermore, by connecting the cooling jacket and the stator holder in the radial direction, the radial size can be reduced.

[0118] (Note 10) In the rotating electric machine system described in Appendix 9, the case member may include a cover portion (242) that extends in a direction intersecting the axial direction of the rotating electric machine and faces the electrical components in the axial direction, and the cover portion may include a first flow path (581) connected to the upstream end through which the refrigerant flows, and an introduction portion (60) that communicates with the first flow path and the jacket flow path and through which the refrigerant is introduced from the outside.

[0119] With this configuration, the cover portion for supplying refrigerant to the cooling jacket from the outside does not overlap with electrical components in the radial direction, thus allowing the rotating electric machine system to be further miniaturized in the radial direction.

[0120] (Note 11) In the rotating electric machine system described in Appendix 10, the cover portion is formed in a substantially disc shape and includes a second flow path (582) connected downstream of each of the plurality of jacket flow paths, and an outlet portion (62) that communicates with the second flow path and discharges the refrigerant to the outside, and each of the first flow path and the second flow path has an insulating space (661, 662) filled with an insulating medium (A) between it and the cover portion, and the first flow path and the second flow path may be insulated from each other by the insulating space.

[0121] With this configuration, by separating the first channel through which the introduced (low-temperature) refrigerant flows from the second channel through which the (high-temperature) refrigerant used for cooling flows, the transfer of heat from the refrigerant in the second channel to the refrigerant in the first channel can be effectively suppressed. Therefore, the cooling efficiency of the conversion unit can be increased. In addition, by providing the first and second channels in the cover section, the rotating electric machine can be miniaturized in the radial direction.

[0122] (Note 12) In the rotating electric machine system described in Appendix 8, the rotating electric machine is an outer rotor type rotating electric machine in which at least a portion of the rotor is arranged radially outward from the stator, the plurality of conversion units are arranged radially inward from the stator, and the plurality of capacitors and the plurality of power modules may be arranged between the stator and the cooling jacket.

[0123] With this configuration, electrical components can be installed using the space radially inside the stator, thus enabling miniaturization of the rotating electric machine system in both the axial and radial directions. By positioning the cooling jacket away from the stator, which generates a large amount of heat, the thermal influence of the stator on the cooling jacket can be effectively suppressed.

[0124] (Note 13) In the rotating electric machine system described in Appendix 12, the rotating electric machine comprises a first busbar (361) that electrically connects the stator and the electrical components, and a second busbar (362) that electrically connects the DC power supply (12) and the electrical components, wherein the first busbar and the second busbar are spaced apart in the axial direction of the rotating electric machine, the first busbar may be provided at one end of the electrical components in the axial direction, and the second busbar may be provided at the other end of the electrical components in the axial direction.

[0125] This configuration allows for the radial miniaturization of the rotating electric machine. Furthermore, by arranging the first and second busbars with electrical components in between, the electrical path can be efficiently managed, resulting in a rotating electric machine with good electrical and thermal balance.

[0126] (Note 14) The rotating electric machine system comprises a rotating electric machine having a rotor with a rotating shaft and driven by AC power, and an electrical component that converts DC power to AC power, wherein the electrical component comprises a plurality of capacitors and a plurality of power modules, and each of the plurality of power modules and the plurality of capacitors is arranged such that the radial projection area is maximized among the radial projection area, axial projection area and circumferential projection area, and the capacitors and power modules are arranged to surround the rotating shaft and are arranged such that at least a portion of the axial position of the rotating shaft overlaps with each other.

[0127] With this configuration, the power module and capacitor are arranged vertically along the axis by arranging them such that their radial projection area is maximized among their radial projection area, axial projection area, and circumferential projection area, and by at least partially overlapping the axial positions of the power module and capacitor, the rotating electric machine system 10 can be made smaller in the radial direction without increasing its size in the axial direction.

[0128] While this disclosure has been described in detail, it is not limited to the individual embodiments described above. These embodiments can be added, replaced, modified, partially deleted, etc., in any way that does not depart from the gist of this disclosure or from the spirit of this disclosure derived from the claims and their equivalents. These embodiments can also be implemented in combination. For example, the order of operations and processes in the embodiments described above are given as examples only and are not limited thereto. The same applies when numerical values ​​or mathematical formulas are used in the description of the embodiments described above. [Explanation of Symbols]

[0129] 10, 10A... Rotating Electrical Machine System 14, 14A... Rotating electric machine 16, 16A… Electrical components 22... Rotor 38…Capacitor 40…Power Module 161...Conversion Unit 381...First main surface 382…1st side 401...Second main surface 402…Second side

Claims

1. A rotating electric machine having a rotor with a rotating shaft and driven by AC power, An electrical component that converts DC power to AC power, A rotating electric machine system comprising, The aforementioned electrical component comprises multiple capacitors and multiple power modules, Each of the power module and the capacitor is, Main surface and, A side surface that intersects with the main surface and has a smaller area than the main surface, Equipped with, A rotating electric machine system in which the capacitor and the power module are arranged such that the direction of the normal of the main surface is aligned with the radial direction of the rotation axis and surrounds the rotation axis, and at least a portion of the axial positions of the rotation axis overlap each other.

2. In the rotating electric machine system according to claim 1, A rotating electric machine system in which the capacitor and the power module are arranged in a circumferential direction.

3. In the rotating electric machine system according to claim 1, The aforementioned electrical component has a plurality of conversion units comprising the capacitor and the power module, The system comprises multiple cooling jackets for cooling each of the multiple conversion units, Each of the multiple cooling jackets has a jacket channel through which the refrigerant flows. A rotating electric machine system in which each of the multiple cooling jackets has a thickness along the normal direction of the main surface that is less than the length along the axial direction of the rotor.

4. In the rotating electric machine system according to claim 3, A rotating electric machine system in which each of the multiple cooling jackets is provided for each of the multiple phases.

5. In the rotating electric machine system according to claim 4, Each of the multiple cooling jackets is One of the aforementioned capacitors, One of the aforementioned power modules, Equipped with, The aforementioned jacket channel is A first flow section for cooling the aforementioned capacitor, A second flow section is connected to the first flow section downstream of the first flow section in the flow direction of the refrigerant and cools the power module, A rotating electric machine system equipped with the following features.

6. In the rotating electric machine system according to claim 5, A rotating electric machine system in which the capacitor and the power module are arranged alternately along the circumferential direction of the rotating electric machine.

7. In the rotating electric machine system according to claim 4, A rotating electric machine system in which each of the multiple cooling jackets is spaced apart from one another in the circumferential direction.

8. In the rotating electric machine system according to any one of claims 3 to 7, The aforementioned rotating electric machine includes a stator, A rotating electric machine system in which the stator and the electrical components are spaced apart in the radial direction and arranged in parallel with respect to each other.

9. In the rotating electric machine system according to claim 8, It has a cylindrical case member that holds the stator, The case member is provided between the stator and the electrical components, The case member has a plurality of holes that penetrate in the radial direction and are spaced apart from each other in the circumferential direction, The aforementioned jacket channel is In the flow direction of the refrigerant, it has an upstream end and a downstream end, The first connecting portion provided at the upstream end, A second connecting portion is formed at the downstream end and connected to the hole, Equipped with, A rotating electric machine system in which the refrigerant flowing through each of the multiple jacket flow paths flows to the stator side through the holes.

10. In the rotating electric machine system according to claim 9, The case member extends in a direction intersecting the axial direction of the rotating electric machine and includes a cover portion that faces the electrical components in the axial direction. The aforementioned cover portion is A first flow path connected to the upstream end through which the refrigerant flows, An introduction section which communicates with the first flow path and the jacket flow path and into which the refrigerant is introduced from the outside, Equipped with a rotating electric system.

11. In the rotating electric machine system according to claim 10, The cover portion is formed in a roughly circular disc shape, A second channel connected downstream of each of the multiple jacket channels, A discharge section that communicates with the second flow path and discharges the refrigerant to the outside, Equipped with, Each of the first channel and the second channel has an insulating space filled with an insulating medium between it and the cover portion. A rotating electric machine system in which the first channel and the second channel are insulated from each other by the aforementioned insulating space.

12. In the rotating electric machine system according to claim 8, The aforementioned rotating electric machine is an outer rotor type rotating electric machine in which at least a portion of the rotor is arranged radially outward from the stator, Multiple conversion units are arranged radially inward of the stator, A rotating electric machine system in which a plurality of the capacitors and a plurality of the power modules are arranged between the stator and the cooling jacket.

13. In the rotating electric machine system according to claim 12, The aforementioned rotating electric machine is A first busbar electrically connects the stator and the electrical components, A second busbar electrically connects the DC power supply and the aforementioned electrical components, Equipped with, The first busbar and the second busbar are arranged spaced apart in the axial direction of the rotating electric machine. A rotating electric machine system in which the first busbar is provided at one end of the electrical component in the axial direction, and the second busbar is provided at the other end of the electrical component in the axial direction.

14. A rotating electric machine having a rotor with a rotating shaft and driven by AC power, An electrical component that converts DC power to AC power, A rotating electric machine system comprising, The aforementioned electrical component comprises multiple capacitors and multiple power modules, Each of the multiple power modules and the multiple capacitors is arranged such that the radial projected area is maximized among the radial projected area, axial projected area, and circumferential projected area. The capacitor and the power module are arranged so as to surround the rotating shaft, and at least a portion of the axial positions of the rotating shaft overlap each other. Rotating electrical machinery systems.

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