CN209860750U - In-wheel motor assembly and vehicle - Google Patents

Abstract

The utility model provides an in-wheel motor assembly and vehicle relates to the vehicle field. The hub motor assembly comprises a motor shaft connected with a vehicle driving shaft, a rotor, a stator arranged opposite to the rotor and a control unit. The rotor is sleeved on the motor shaft, and a permanent magnet is arranged on the rotor. The stator is provided with an excitation winding, and the excitation winding and the permanent magnet induce a magnetic field to enable the rotor to synchronously rotate under the condition of electrification. The control unit comprises a SiC power device which is arranged at a motor shaft and used for controlling the hub motor to work. The utility model discloses well adoption has the control unit of SiC power device, has replaced Si power device among the prior art, because the relative Si power device of SiC power device has higher current density, has consequently reduced in-wheel motor's volume, has further improved in-wheel motor power density.

Description

In-wheel motor assembly and vehicle

Technical Field

The utility model relates to a vehicle field especially relates to an in-wheel motor assembly and vehicle.

Background

In recent years, driven by the double pressure of energy and environmental protection, electric vehicles become the research and development focus of the automobile industry, and electric vehicles driven by hub motors are receiving much attention. The hub motor is arranged at the hub position of the wheel, the motor and the wheel form a whole body, the wheel is directly driven by the motor, a heavy mechanical transmission system of a traditional internal combustion engine automobile is not needed, the size is small, the specific power is high, the transmission efficiency is high, the whole automobile mechanism can be greatly simplified, the weight and the gravity center of the whole automobile are reduced, and therefore the battery consumption of the electric automobile is reduced, and the stability of the electric automobile is improved. The in-wheel motor drive format is known in the industry as an electric vehicle final drive format.

In the prior art, a motor controller adopting a Si power device has the problem of low power density of a motor, a cooling system is arranged for radiating heat of a hub motor and the motor controller, and the weight and the structure of the hub motor are correspondingly complicated due to the cooling system.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an object of first aspect provides a wheel hub motor assembly, solves the low problem of wheel hub motor power density among the prior art.

The utility model discloses the further purpose of first aspect is to simplify motor structure.

The utility model discloses the purpose of second aspect provides a vehicle.

According to the utility model discloses an aim of first aspect, the utility model provides an in-wheel motor assembly, include:

a motor shaft connected to a vehicle drive shaft;

the rotor is sleeved on the motor shaft, and a permanent magnet is arranged on the rotor;

the stator is arranged opposite to the rotor, an excitation winding is arranged on the stator, and the excitation winding and the permanent magnet induce a magnetic field to enable the rotor to synchronously rotate under the condition of electrifying;

and the control unit comprises a SiC power device and is arranged at the motor shaft and used for controlling the operation of the hub motor.

Optionally, the method further comprises:

the heat dissipation module comprises a first heat dissipation rib and a second heat dissipation rib;

the first heat dissipation ribs are arranged on the outer side of the rotor along the axial direction of the rotor and used for dissipating heat of the permanent magnets.

Optionally, the method further comprises:

the fixing piece is used for connecting the stator with the motor shaft and comprises a connecting part connected with the stator and a supporting part connected with the motor shaft;

the control unit is fixed on the support part.

Optionally, the connecting portion has two opposite sides, one side of the connecting portion is connected to the stator, the other side of the connecting portion is connected to the supporting portion and provided with the second heat dissipation rib, and the second heat dissipation rib is used for dissipating heat of the excitation winding on the stator.

Optionally, the second heat dissipation ribs are uniformly distributed on the connecting portion along the axial direction of the stator.

Optionally, the rotor is connected to the motor shaft by a bearing.

Optionally, the method further comprises:

and the braking part is connected with the rotor, sleeved on the motor shaft and used for braking the vehicle.

Optionally, the control unit is an inverter.

According to the utility model discloses a second aspect, the utility model discloses still include a vehicle, the vehicle mounting have motor assembly.

The utility model discloses a motor shaft, rotor, stator and the control unit with vehicle drive shaft connection, the rotor cover is established on the motor shaft and is provided with the permanent magnet, and the stator sets up and is equipped with excitation winding with the rotor relatively, excites excitation winding and permanent magnet induction magnetic field so that the rotor rotates in step under the circular telegram. The control unit comprises a SiC power device and is arranged at a motor shaft and used for controlling the hub motor to work. The utility model discloses well adoption has the control unit of SiC power device, has replaced Si power device among the prior art, because the relative Si power device of SiC power device has higher current density, has consequently reduced in-wheel motor's volume, has reached in-wheel motor lightweight requirement, has further improved in-wheel motor power density.

Additionally, the utility model discloses still include the thermal module, the thermal module includes first heat dissipation muscle and second heat dissipation muscle, and first heat dissipation muscle sets up on the rotor for dispel the heat for the permanent magnet. The second heat dissipation ribs are arranged on the connecting portions and used for dissipating heat of the excitation winding on the stator, and a cooling system in the prior art is omitted, so that the heat dissipation efficiency of the hub motor is improved, and the structure of the motor is simplified.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic block diagram of an in-wheel motor assembly according to an embodiment of the present invention;

fig. 2 is a schematic block diagram of a control unit of the in-wheel motor assembly shown in fig. 1.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Fig. 1 is a schematic structural view of an in-wheel motor assembly according to an embodiment of the present invention, and fig. 2 is a schematic structural view of a control unit of the in-wheel motor assembly shown in fig. 1. As shown in fig. 1-2, in one particular embodiment, the in-wheel motor assembly 100 may generally include a motor shaft 8 connected to a vehicle drive shaft, a rotor 9, a stator 3, and a control unit 5. The rotor 9 is sleeved on the motor shaft 8 and is connected with the motor shaft 8 through the bearing 6, and the permanent magnet 2 is arranged on the rotor 9. The stator 3 is arranged opposite to the rotor 9 and is provided with an excitation winding 4, and the excitation winding 4 and the permanent magnet 2 induce a magnetic field under the condition of electrifying so as to enable the rotor 9 to synchronously rotate. The control unit 5 comprises a SiC power device 51 arranged at the motor shaft 8 for controlling the operation of the in-wheel motor.

The utility model discloses well adoption has the control unit 5 of SiC power device 51, has replaced Si power device among the prior art, because the relative Si power device of SiC power device has higher current density, has consequently reduced in-wheel motor's volume, has further improved in-wheel motor power density.

Additionally, the utility model provides a SiC power device 51's operating temperature can reach 3 times of Si power device 51's operating temperature, and the highest operating temperature of Si power device 51 is 175 ℃, and SiC power device 51's high temperature working ability has reduced the radiating requirement of wheel hub motor, can satisfy the requirement of 5 natural cooling of wheel hub motor the control unit. In addition, the SiC power device 51 has the advantages of high thermal conductivity, high breakdown field strength, high saturation drift rate, high thermal stability, chemical inertness, and the like.

In another embodiment, the in-wheel motor assembly 100 further includes a heat dissipation module 10, the heat dissipation module 10 includes a first heat dissipation rib 12 and a second heat dissipation rib 11, and the first heat dissipation rib 12 is disposed on the outer side of the rotor 9 along the axial direction of the rotor 9 and is used for dissipating heat of the permanent magnet 2. In addition, the first heat dissipation ribs 12 also serve to dissipate heat from the rotor core. Specifically, the area of the first heat dissipation rib 12 arranged on the rotor 9 is not smaller than the area of the permanent magnet 2, and the first heat dissipation rib 12 is added to increase the heat dissipation area of the permanent magnet 2, so that the heat dissipation efficiency of the permanent magnet 2 and the rotor core is further improved.

Further, the in-wheel motor assembly 100 further includes a fixing member 20 for connecting the stator 3 with the motor shaft 8, and the fixing member 20 includes a connecting portion 22 connected with the stator 3 and a supporting portion 21 connected with the motor shaft 8. Further, the control unit 5 is fixed on the support portion 21. Integrating the control unit 5 inside the in-wheel motor and fixed on the support portion 21 can reduce the weight and cost of the vehicle, and can control the rotation speed and torque of the vehicle more accurately.

In addition, the connecting portion 22 has two opposite sides, one side is connected with the stator 3, the other side is connected with the supporting portion 21 and is provided with the second heat dissipation rib 11, and the second heat dissipation rib 11 is used for dissipating heat of the excitation winding 4 on the stator 3, so that the heat dissipation efficiency of the excitation winding 4 is improved. Specifically, the second heat dissipation ribs 11 are uniformly distributed on the connection portion 22 in the axial direction of the stator 3, so that the heat dissipation of the field winding 4 is more uniform.

The in-wheel motor assembly 100 further comprises a braking part 7 which is connected with the rotor 9 and sleeved on the motor shaft 8 and used for braking the vehicle, so that the braking efficiency is improved.

The in-wheel motor assembly 100 further comprises a tire 1, which is arranged at the outermost side of the in-wheel motor assembly 100 and is connected with the rotor 9.

The utility model discloses set up on rotor 9 and be used for 2 and the radiating first heat dissipation muscle 12 of rotor core of permanent magnet, be provided with on mounting 20 and be used for giving excitation winding 4 radiating second heat dissipation muscle 11, replaced the cooling system among the prior art, reached the lightweight requirement of in-wheel motor, further simplified in-wheel motor's structure.

In yet another embodiment, the control unit 5 is an inverter, and mainly includes a capacitive ring 54, a power module 53, a driving circuit 52, and a control chip 55. The operation of the control unit 5 will now be explained.

Firstly, the control unit 5 generates an interactive circuit through a PWM (pulse width modulation) wave, the control chip 55 receives an instruction for the in-wheel motor and then transmits the instruction to the driving module 52, and the driving module 52 converts the instruction into an on-off instruction of the power module 53 to control and drive the in-wheel motor to operate. The control unit 5 mainly controls the voltage and current of the hub motor. In addition, the capacitance loop 54 functions to perform a filtering process. Because of the adoption of the SiC power device, the hub motor assembly 100 does not need to be provided with a complex cooling system, the heat dissipation requirement can be met by adopting a natural cooling mode, and in addition, the volume of the control unit 5 adopting the SiC power device is 30 percent of that of a common controller, so that the weight of the whole hub motor is reduced, and the requirement of light weight is further met.

The utility model provides a device such as clutch, derailleur have been saved to in-wheel motor assembly, and transmission efficiency is improved by a wide margin. On the one hand, for a new energy vehicle, mainly driven by electricity, the hub motor can be used as a main driving force. For a hybrid vehicle, the hub motor can also serve as supplementary power for starting and accelerating, fuel consumption can be reduced by 30%, 80% of braking energy can be recovered, and the endurance mileage of the vehicle is improved. On the other hand, the hub motor integrates power, transmission and braking into a hub, the structure of the chassis is greatly simplified, the space in the automobile is saved, the space utilization rate of the automobile is improved, and the self weight is reduced by 30%. In addition, the wheel hub motor directly drives the wheel, the rotating speed and the torque of the wheel can be controlled at high precision without complex operation instructions, and the driving requirements under different working conditions are met.

The utility model also provides a vehicle, it installs arbitrary embodiment of above-mentioned in-wheel motor assembly.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (9)

1. An in-wheel motor assembly, comprising:

a motor shaft connected to a vehicle drive shaft;

the rotor is sleeved on the motor shaft, and a permanent magnet is arranged on the rotor;

the stator is arranged opposite to the rotor, an excitation winding is arranged on the stator, and the excitation winding and the permanent magnet induce a magnetic field to enable the rotor to synchronously rotate under the condition of electrifying;

and the control unit comprises a SiC power device and is arranged at the motor shaft and used for controlling the operation of the hub motor.

2. The in-wheel motor assembly of claim 1, further comprising:

the heat dissipation module comprises a first heat dissipation rib and a second heat dissipation rib;

the first heat dissipation ribs are arranged on the outer side of the rotor along the axial direction of the rotor and used for dissipating heat of the permanent magnets.

3. The in-wheel motor assembly of claim 2, further comprising:

the fixing piece is used for connecting the stator with the motor shaft and comprises a connecting part connected with the stator and a supporting part connected with the motor shaft;

the control unit is fixed on the support part.

4. The in-wheel motor assembly of claim 3,

the connecting portion has relative both sides, one side with the stator is connected, the opposite side with the supporting part is connected and is provided with the second heat dissipation muscle, the second heat dissipation muscle is used for giving excitation winding heat dissipation on the stator.

5. The in-wheel motor assembly of claim 3,

the second heat dissipation ribs are uniformly distributed on the connecting portion along the axial direction of the stator.

6. The in-wheel motor assembly of claim 1,

the rotor is connected with the motor shaft through a bearing.

7. The in-wheel motor assembly of claim 1, further comprising:

and the braking part is connected with the rotor, sleeved on the motor shaft and used for braking the vehicle.

8. The in-wheel motor assembly of claim 1,

the control unit is an inverter.

9. A vehicle fitted with an in-wheel motor assembly as claimed in any one of claims 1 to 8.