CN113270964A

CN113270964A - In-wheel motor system

Info

Publication number: CN113270964A
Application number: CN202110574108.1A
Authority: CN
Inventors: 赵慧超; 刘金锋; 苍衍; 徐德才; 苏瑞涛; 朱占山
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-08-17
Also published as: WO2022247268A1

Abstract

The invention belongs to the technical field of hub motors, and discloses a hub motor system, which comprises: a motor housing; the motor and inverter shell assembly comprises a motor inner shell and an inverter shell, and a heat exchange cavity is arranged between the motor inner shell and the motor outer shell; the capacitor and power module integrated assembly is arranged in the inverter shell and provided with a heat dissipation flow channel, the front end of the heat dissipation flow channel receives heat exchange liquid, and the tail end of the heat dissipation flow channel is communicated with the heat exchange cavity; and the control component is arranged in the inverter shell and is arranged on the surface of the capacitor and power module integrated component along the axial direction. Has the advantages that: the heat exchange liquid simultaneously dissipates heat of the motor, the capacitor and the power module integrated assembly and the control assembly, so that the integrated maximum design is met, and the heat dissipation space is saved.

Description

In-wheel motor system

Technical Field

The invention relates to the technical field of hub motors, in particular to a hub motor system.

Background

The wheel hub motor technology is also called as the wheel built-in motor technology, and the most important characteristic of the wheel hub motor technology is that power, transmission and braking devices are integrated into a wheel hub, so that the mechanical part of an electric vehicle is greatly simplified. The arrangement of the hub motor driving system is very flexible, and the electric automobile can be driven by two front wheels, two rear wheels or four wheels. The driving force of each electric wheel is directly and independently controllable, so that the dynamic control is more flexible and convenient; the driving force of each electric wheel can be reasonably controlled, so that the driving performance under the condition of a severe road surface is improved.

However, the existing hub motor technology still has some technical difficulties and needs to break through, a hub motor system integrates multiple functions of driving, braking, bearing and the like, the internal space of a wheel is limited, the requirement on the power density performance of the motor is high, and the design difficulty is large. In addition, the working environment of the wheel is too complex, the durability is not guaranteed well, and the problems of high-speed vibration, noise, braking, suspension optimization and heat dissipation are solved, so that more rigorous requirements are provided for internal devices of the hub motor, and the requirements of the existing hub motor on high integration level, limited space, complex working environment, high-speed vibration and heat dissipation are hardly met.

Disclosure of Invention

The invention aims to provide an in-wheel motor system to solve the problem that integration level and heat dissipation cannot be achieved at the same time.

In order to achieve the purpose, the invention adopts the following technical scheme:

an in-wheel motor system comprising:

a motor housing;

the motor and inverter shell assembly comprises a motor inner shell and an inverter shell which are sequentially connected along the axial direction, wherein the motor inner shell and the motor outer shell are radially opposite and a heat exchange cavity is arranged between the motor inner shell and the motor outer shell;

the capacitor and power module integrated assembly is arranged in the inverter shell and provided with a heat dissipation flow channel extending along the length direction of the capacitor and power module integrated assembly, the front end of the heat dissipation flow channel receives heat exchange liquid, and the tail end of the heat dissipation flow channel is communicated with the heat exchange cavity; and

and the control component is arranged in the inverter shell and is positioned on the surface of the capacitor and power module integrated component.

As a preferable scheme of the above hub motor system, a partition plate is arranged on the motor outer shell or the motor inner shell, the partition plate partitions the heat exchange cavity, the inverter shell comprises the inverter shell bottom, and the inverter shell bottom is provided with a motor water inlet on a first side of the partition plate;

the tail end of the heat dissipation flow channel is connected with the heat exchange cavity through the water inlet of the motor, and the second side of the partition plate in the heat exchange cavity is communicated to the outside of the inverter shell.

The baffle is both sides with the heat exchange chamber partition, and the end of heat dissipation runner passes through the motor water inlet and connects the heat exchange chamber, makes the heat exchange chamber feed liquor, in the heat exchange chamber the second side of baffle communicates outside the inverter shell for heat exchange liquid can be through complete heat exchange chamber, and feed liquor and play liquid mutually noninterfere.

As a preferable aspect of the above in-wheel motor system, the motor housing includes:

the first end of the motor shell main body is hermetically connected with the inverter shell bottom; and

the motor outer shell convex lip is annularly arranged on the inner side of the second end of the motor outer shell main body, and the end part of the motor inner shell is in sealing butt joint with the motor outer shell convex lip;

wherein the heat exchange cavity is arranged among the motor shell main body, the motor shell lip and the inverter shell.

A heat exchange cavity is formed among the motor shell main body, the motor shell convex lip and the inverter shell.

As a preferable scheme of the above in-wheel motor system, the motor outer shell main body is in threaded connection with the bottom of the inverter shell, and a sealing ring is arranged between the motor inner shell and the motor outer shell lip.

Adopt threaded connection to realize stable connection and provide sealed effect between motor housing main part and the dc-to-ac converter shell bottom, motor housing lip passes through sealing washer sealing connection motor inner shell in order to keep sealed.

As a preferable aspect of the above in-wheel motor system, the inverter case further includes:

the outer side wall of the inverter is connected to the peripheral edge of the bottom of the inverter shell, and is provided with a motor water outlet which is communicated to the second side of the partition plate;

an inverter inner sidewall connected to an inner peripheral edge of the inverter case bottom; and

the inverter cover is connected between the top of the outer side wall of the inverter and the top of the inner side wall of the inverter, a water outlet pipe is arranged on the outer surface of the inverter cover, and the water outlet pipe is in butt joint with a water outlet of the motor;

the capacitor and power module integrated assembly is arranged among the inverter shell bottom, the inverter outer side wall, the inverter inner side wall and the inverter cover.

The outer side wall of the inverter is provided with a motor water outlet, the motor water outlet is communicated with the second side of the partition plate, namely the end point of the heat exchange cavity flows out of the motor water outlet, the end point of the heat exchange cavity and the heat exchange liquid enter the heat exchange cavity without interfering with each other, the water outlet pipe is connected with the motor water outlet and flows out of the hub motor system from the water outlet pipe, and the capacitor and power module integrated assembly can be limited between the bottom of the inverter shell, the outer side wall of the inverter, the inner side wall of the inverter and the inverter cover.

As a preferable solution of the above in-wheel motor system, the capacitor and power module integrated component includes:

the heat dissipation flow channel flows through the inside of the capacitor and the first surface of the capacitor, which deviates from the motor inner shell; and

and the power module is arranged on the first surface.

The heat dissipation flow channel flows through the interior and the first surface of the capacitor, and the power module is arranged on the first surface, so that one heat dissipation flow channel dissipates heat of the capacitor and the power module.

As a preferable aspect of the above in-wheel motor system, the capacitor includes:

the capacitor shell is made of metal and is arranged in a fan-shaped manner, the capacitor shell is provided with a capacitor shell main board and two capacitor shell side boards, the first surface is arranged on the capacitor shell main board, the capacitor shell side boards extend along the length direction of the capacitor shell main board, the first surface is provided with a plurality of water channel grooves, two ends of each water channel groove in the length direction are provided with openings, and the water channel grooves are communicated between the two capacitor shell side boards through the openings; and

and the capacitor core is arranged between the capacitor shell main board and the two capacitor shell side plates.

The capacitor shell mainboard is provided with a first surface and a water tank, openings are arranged at two ends of the water tank, and the capacitor core is arranged between the capacitor shell mainboard and the two capacitor shell side plates, so that heat exchange liquid flows through the capacitor core.

As a preferable aspect of the in-wheel motor system, the power module is disposed in each of the water channel grooves.

The heat exchange liquid dissipates heat of the power module when flowing through the water channel groove, and the water channel groove is sunken relative to the first surface, so that the occupied space of the power module can be reduced.

As an optimal scheme of the above wheel hub motor system, one end of the capacitor shell in the length direction is provided with a liquid inlet, the other end is provided with a liquid outlet, the outer surface of the inverter cover is further provided with a water inlet pipe, the liquid inlet is connected with the water inlet pipe, and the liquid outlet is connected with the water inlet of the motor.

The liquid inlet and the liquid outlet are respectively arranged at two ends of the length direction of the capacitor shell, so that heat exchange liquid can flow through the whole capacitor shell, and flows into the motor through the water inlet pipe and the motor water inlet in sequence.

As a preferable aspect of the above in-wheel motor system, the in-wheel motor system further includes:

the motor assembly comprises a stator and a rotor, wherein the stator is arranged on the radial inner side of the motor inner shell, and the rotor is arranged on the radial inner side of the stator.

The stator is at the radial inboard of motor inner shell, makes the heat exchange cavity can dispel the heat to the stator.

The invention has the beneficial effects that: the radial opposition of motor inner shell and motor housing forms the heat exchange chamber, thereby dispel the heat to motor system inside, control assembly sets up in the inverter shell and sets up the surface at condenser and power module integrated component, and condenser and power module integrated component are equipped with the heat dissipation runner that extends along self length direction, the terminal intercommunication heat exchange chamber of heat dissipation runner, thereby dispel the heat to control assembly and condenser and power module, and make a heat exchange liquid simultaneously to the motor, condenser and power module integrated component and control assembly heat dissipation, satisfy integrated maximize design, the heat dissipation space has been saved.

Drawings

FIG. 1 is a schematic structural diagram of an in-wheel motor system according to an embodiment of the present application;

FIG. 2 is an axial exploded view of the in-wheel motor system of the present application embodiment;

FIG. 3 is an axial cross-sectional view of the in-wheel motor system of the present application;

fig. 4 is a schematic structural diagram of an inverter housing of the in-wheel motor system according to the embodiment of the application;

FIG. 5 is a schematic structural diagram of a capacitor and power module integrated assembly of the in-wheel motor system of an embodiment of the present application from a first perspective;

fig. 6 is a schematic structural diagram of a capacitor and power module integrated assembly of the in-wheel motor system in a second view according to the embodiment of the present application.

In the figure:

1-a motor housing; 11-a motor housing body; 12-motor housing lip; 100-a heat exchange chamber;

2-motor and inverter housing assembly; 21-a motor inner housing; 22-inverter housing; 220-inverter case bottom; 2201-motor water inlet; 221-inverter outer sidewall; 2210-motor water outlet; 222-inverter inner side walls; 223-inverter cover; 2230 water inlet pipe; 2231-water outlet pipe;

3-capacitor and power module integrated components; 31-capacitance; 32-a power module; 311-a capacitor case; 3111-main board of capacitor case; 3112-capacitor case side panel; 3113-water channel trough; 3114-opening; 3115-liquid inlet; 3116-a liquid outlet;

4-a control component;

51-a stator; 52-a rotor;

6-brake.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The invention provides an in-wheel motor system, and fig. 1 is a schematic structural diagram of the in-wheel motor system in the embodiment of the present application, fig. 2 is an axial exploded view of the in-wheel motor system in the embodiment of the present application, and fig. 3 is an axial sectional view of the in-wheel motor system in the embodiment of the present application.

Referring to fig. 1-3, the in-wheel motor system includes a motor housing 1, a motor and inverter housing assembly 2, a capacitor and power module integrated component 3, a control component 4, a motor component and a brake 6.

The motor housing 1 has an annular outer peripheral surface, and the center axis of the in-wheel motor system is inserted through the geometric center of the motor housing 1, in other words, fig. 2 is an exploded view of fig. 1 along the center axis.

The motor and inverter housing assembly 2 comprises a motor inner shell 21 and an inverter shell 22 which are sequentially connected along the axial direction, the motor inner shell 21 and the motor outer shell 1 are opposite in the radial direction, and a heat exchange cavity 100 is arranged between the motor inner shell 21 and the motor outer shell 1, it can be understood that the motor inner shell 21 and the motor outer shell 1 are coaxially arranged, and the diameter of the motor inner shell 21 is smaller than that of the motor outer shell 1, so that the motor inner shell 21 and the motor outer shell are opposite in the radial direction and form an annular heat exchange cavity 100.

Condenser and power module integrated component 3 sets up in inverter shell 22, condenser and power module integrated component 3 is equipped with the heat dissipation runner that extends along self length direction, and heat exchange liquid is received to the front end of heat dissipation runner, and heat dissipation runner's end intercommunication heat exchange chamber 100, and control assembly 4 sets up in inverter shell 22 to set up on condenser and power module integrated component 3 surface.

The radial opposition of motor inner shell 21 and motor outer shell 1 forms heat exchange chamber 100, thereby dispel the heat to motor system inside, control assembly 4 sets up in inverter shell 22 and sets up on condenser and power module integrated component 3's surface, and condenser and power module integrated component 3 are equipped with the heat dissipation runner that extends along self length direction, the end intercommunication heat exchange chamber 100 of heat dissipation runner, thereby dispel the heat to control assembly 4 and condenser and power module 3, and make one heat exchange liquid simultaneously to inside motor assembly, condenser and power module integrated component 3 dispel the heat with control assembly 4, satisfy integrated maximize design, the heat dissipation space has been saved.

Note that the motor assembly is disposed inside the motor inner casing 21.

Further, the motor assembly includes a stator 51 and a rotor 52, and the stator 51 is disposed at a radially inner side of the motor inner casing 21, so that the heat exchange chamber 100 can dissipate heat of the stator 51. The rotor 52 is disposed radially inward of the stator 51.

The brake 6 is disposed radially inside the inverter case 22.

Further, the motor outer casing 1 or the motor inner casing 21 is provided with a partition plate that partitions the heat exchange chamber 100 in the circumferential direction, and in the present embodiment, a partition plate (not shown) is provided on the motor inner casing 21 and extends in the axial direction.

The inverter housing 22 includes an inverter housing bottom 220, the inverter housing bottom 220 is provided with a motor water inlet 2201 on a first side of the partition, and according to the above requirement, one right-angled edge of the partition is disposed on the inverter housing bottom 220, and the other edge is disposed on the motor inner housing 21.

The tail end of the heat dissipation flow channel is connected with the heat exchange cavity 100 through a motor water inlet 2201, and the second side of the partition board in the heat exchange cavity 100 is communicated to the outside of the inverter shell 22.

The end of the heat dissipation channel is connected to the left side of the partition board in the heat exchange chamber 100 and then flows out from the right side of the partition board, thereby passing through the whole heat exchange chamber 100 and ensuring the heat dissipation range. Also, in the present embodiment, the heat exchange chamber 100 surrounds the entire circumference of the stator 51, thereby ensuring sufficient heat dissipation requirements.

Referring to fig. 3 to 4, the motor housing 1 includes a motor housing main body 11 and a motor housing lip 12, and an upper end of the motor housing main body 11 is hermetically connected to a lower surface of an inverter housing bottom 220 of the inverter housing 22; the motor outer shell lip 12 is annularly arranged on the inner side of the lower end of the motor outer shell main body 11, and the lower end of the motor inner shell 21 is in sealing butt joint with the motor outer shell lip 12. The heat exchange chamber 100 is provided between the motor case main body 11, the motor case lip 12, and the inverter case 22.

Further, in the embodiment of the present application, the motor housing main body 11 is screwed to the inverter housing bottom 220, and it is understood that a set of bolts axially penetrates through the motor housing main body 11 and is connected to the screw thread of the inverter housing bottom 220.

Further, a sealing ring is arranged between the motor inner shell 21 and the motor outer shell convex lip 12. For example, a groove may be formed in the outer wall of the motor inner housing 21, the plane of the groove is perpendicular to the axial direction, and the sealing ring is clamped in the groove and is in sealing contact with the motor outer housing lip 12.

With continued reference to fig. 3, the inverter case 22 further includes an inverter outer side wall 221, an inverter inner side wall 222, and an inverter cover 223.

The outer side wall 221 of the inverter is connected to the peripheral edge of the bottom 220 of the inverter casing, the outer side wall 221 of the inverter is provided with a motor water outlet 2210, and the motor water outlet 2210 is communicated downwards to the right side of the baffle.

The inverter inner sidewall 222 is connected to the inner peripheral edge of the inverter case bottom 220, and it is understood that the inverter inner sidewall 222 and the inverter outer sidewall 221 are concentrically and coaxially arranged and constitute an annular structure.

The inverter cover 223 is hermetically connected between the top of the inverter outer side wall 221 and the top of the inverter inner side wall 222, that is, the inverter cover 223 covers the annular structure, and as shown in fig. 1, an inlet pipe 2230 and an outlet pipe 2231 are disposed on the outer surface of the inverter cover 223, and the outlet pipe 2231 is in butt joint with the motor water outlet 2210. That is, the heat exchange liquid passes through the heat exchange cavity 100 and then sequentially passes through the motor water outlet 2210 and the water outlet pipe 2231, and then is discharged out of the system.

It should be noted that the capacitor and power module integrated component 3 is disposed between the inverter case bottom 220, the inverter outer side wall 221, the inverter inner side wall 222, and the inverter cover 223.

Referring to fig. 5 and 6, the capacitor and power module integrated assembly 3 includes: a capacitor 31 and a power module 32. The capacitor and power module integrated assembly 3 is in a fan-shaped ring shape as a whole, that is, the capacitor and power module integrated assembly 3 only occupies part of the inverter housing bottom 220.

It should be noted that the heat dissipation flow channel flows through the inside of the capacitor 31 and the first surface of the capacitor 31 away from the motor inner casing 21, and the power module 32 is disposed on the first surface. The heat dissipation flow path can dissipate heat from the inside of the capacitor 31 and the power module 32.

The capacitor 31 includes a capacitor case 311 and a capacitor core inside thereof.

Capacitor case 311 is made by the metal and sets up to the fan ring shape, capacitor case 311 is equipped with capacitor case mainboard 3111 and two capacitor case curb plates 3112, the first surface sets up on capacitor case mainboard 3111, in other words, the first surface is the surface of capacitor case mainboard 3111, capacitor case curb plate 3112 extends along capacitor case mainboard 3111's length direction, the first surface is equipped with four water channel groove 3113, four water channel groove 3113 communicate in proper order and form above-mentioned heat dissipation runner, can understand, water channel groove 3113 is not on the coplanar with the first surface, there is the difference in height in the plane of tank bottom place of water channel groove 3113 and the plane of first surface place.

Namely, the water channel groove 3113 is arranged to realize heat exchange between the components on the inner side and the outer side of the capacitor shell 311.

Both ends of the length direction of each water channel groove 3113 are provided with an opening 3114, and the water channel groove 3113 is communicated between the two capacitor case side plates 3112 through the opening 3114. The capacitor core is disposed between the capacitor case main plate 3111 and the two capacitor case side plates 3112.

The space between the capacitor core and the capacitor case 311 is filled with epoxy resin.

Further, one power module 32 is provided in each water channel groove 3113. The heat exchange liquid dissipates heat to the power module 32 when flowing through the water channel groove 3113, and the water channel groove 3113 is concave relative to the first surface, so that the occupied space of the power module 32 can be reduced. It should be noted that, in practical effect, one power module 32 is respectively disposed in the four water channel grooves 3113 in fig. 5, and two of the power modules 32 are hidden for convenience of illustration.

Further, a liquid inlet 3115 is provided at one end of the capacitor case 311 in the length direction, a liquid outlet 3116 is provided at the other end, the liquid inlet 3115 is communicated with the water inlet pipe 2230, the liquid inlet 3115 and the water inlet pipe 2230 are substantially axially opposed, and the liquid outlet 3116 is connected to the motor water inlet 2201. It can be understood that the heat exchange liquid enters the capacitor housing 311 through the inlet pipe 2230 and the inlet 3115 in sequence, flows out of the outlet port 3116 after flowing through each water channel groove 3113, enters the heat exchange cavity 100 through the motor inlet 2201, then flows through the whole heat exchange cavity 100, enters the outlet pipe 2231 through the motor outlet 2210, and then circulates out of the system.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An in-wheel motor system, comprising:

a motor housing (1);

the motor and inverter shell assembly (2) comprises a motor inner shell (21) and an inverter shell (22) which are sequentially connected along the axial direction, wherein the motor inner shell (21) and the motor outer shell (1) are opposite in the radial direction, and a heat exchange cavity (100) is arranged between the motor inner shell and the motor outer shell;

the capacitor and power module integrated assembly (3) is arranged in the inverter shell (22), the capacitor and power module integrated assembly (3) is provided with a heat dissipation flow channel extending along the length direction of the capacitor and power module integrated assembly, the front end of the heat dissipation flow channel receives heat exchange liquid, and the tail end of the heat dissipation flow channel is communicated with the heat exchange cavity (100); and

and the control component (4) is arranged in the inverter shell (22) and is positioned on the surface of the capacitor and power module integrated component (3).

2. The in-wheel motor system according to claim 1, characterized in that the motor outer shell (1) or the motor inner shell (21) is provided with a partition wall which partitions the heat exchange cavity (100), the inverter shell (22) comprises the inverter shell bottom (220), and the inverter shell bottom (220) is provided with a motor water inlet (2201) at a first side of the partition wall;

the tail end of the heat dissipation flow channel is connected with the heat exchange cavity (100) through the motor water inlet (2201), and the second side of the partition plate in the heat exchange cavity (100) is communicated to the outside of the inverter shell (22).

3. The in-wheel motor system according to claim 2, characterized in that the motor housing (1) comprises:

a motor housing body (11), wherein a first end of the motor housing body (11) is hermetically connected with the inverter housing bottom (220); and

the motor outer shell protruding lip (12), the motor outer shell protruding lip (12) is arranged on the inner side of the second end of the motor outer shell main body (11) in a surrounding mode, and the end portion of the motor inner shell (21) is in sealing abutting connection with the motor outer shell protruding lip (12);

wherein the heat exchange cavity (100) is arranged among the motor housing main body (11), the motor housing lip (12) and the inverter housing (22).

4. The in-wheel motor system according to claim 3, characterized in that the motor outer shell main body (11) is in threaded connection with the inverter shell bottom (220), and a sealing ring is arranged between the motor inner shell (21) and the motor outer shell protruding lip (12).

5. The in-wheel motor system according to claim 3, wherein the inverter housing (22) further comprises:

the outer inverter wall (221) is connected to the peripheral edge of the inverter shell bottom (220), the outer inverter wall (221) is provided with a motor water outlet (2210), and the motor water outlet (2210) is communicated to the second side of the partition plate;

an inverter inner sidewall (222) connected to an inner peripheral edge of the inverter case bottom (220); and

the inverter cover (223) is connected between the top of the outer side wall (221) of the inverter and the top of the inner side wall (222) of the inverter, a water outlet pipe (2231) is arranged on the outer surface of the inverter cover (223), and the water outlet pipe (2231) is in butt joint with a water outlet (2210) of the motor;

the capacitor and power module integrated assembly (3) is arranged among the inverter shell bottom (220), the inverter outer side wall (221), the inverter inner side wall (222) and the inverter cover (223).

6. The in-wheel motor system according to claim 5, characterized in that the capacitor and power module integrated assembly (3) comprises:

a capacitor (31), wherein the heat dissipation flow channel flows through the inside of the capacitor (31) and a first surface of the capacitor (31) facing away from the motor inner shell (21); and

a power module (32) disposed on the first surface.

7. The in-wheel motor system according to claim 6, characterized in that the capacitor (31) comprises:

the capacitor shell (311) is made of metal and is arranged in a fan-ring shape, the capacitor shell (311) is provided with a capacitor shell main board (3111) and two capacitor shell side boards (3112), the first surface is arranged on the capacitor shell main board (3111), the capacitor shell side boards (3112) extend along the length direction of the capacitor shell main board (3111), the first surface is provided with a plurality of water channel grooves (3113), two ends of each water channel groove (3113) in the length direction are respectively provided with an opening (3114), and the water channel grooves (3113) are communicated between the two capacitor shell side boards (3112) through the openings (3114); and

and the capacitor core is arranged between the capacitor shell main board (3111) and the two capacitor shell side boards (3112).

8. The in-wheel motor system according to claim 7, characterized in that the power module (32) is disposed in each of the water channel grooves (3113).

9. The in-wheel motor system according to claim 7, wherein a liquid inlet (3115) is formed at one end of the capacitor housing (311) in the length direction, a liquid outlet (3116) is formed at the other end of the capacitor housing, a water inlet pipe (2230) is further formed on the outer surface of the inverter cover (223), the liquid inlet (3115) is connected with the water inlet pipe (2230), and the liquid outlet (3116) is connected with the motor water inlet (2201).

10. The in-wheel motor system of claim 1, further comprising:

the motor assembly comprises a stator (51) and a rotor (52), wherein the stator (51) is arranged on the radial inner side of the motor inner shell (21), and the rotor (52) is arranged on the radial inner side of the stator (51).