CN113726116B

CN113726116B - Motor and vehicle

Info

Publication number: CN113726116B
Application number: CN202110951084.7A
Authority: CN
Inventors: 李娜; 潘振锋; 李强; 张鑫垚; 何如冰
Original assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weichai New Energy Technology Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-11-29
Anticipated expiration: 2041-08-18
Also published as: CN113726116A

Abstract

The invention relates to the technical field of vehicles and discloses a motor and a vehicle, wherein the motor comprises: the first stator, the first rotor, the second stator and the second rotor are positioned in the shell; the first rotor and the first stator are coaxial and rotate relatively, and the second rotor and the second stator are coaxial and rotate relatively; the output shaft of the first rotor and the output shaft of the second rotor both extend out of the housing. In the motor, the first stator, the first rotor, the second stator and the second rotor are packaged in the same shell, so that the use of shell structures such as end covers and the like can be reduced, and the motor is beneficial to light weight; meanwhile, the shell independently encapsulates the internal structure, and the output shaft of the first rotor and the output shaft of the second rotor which extend out of the shell are used for driving one wheel respectively, so that a motor does not need to be arranged in a hub, and the increase of the rotational inertia of the hub is avoided; in addition, as the two sets of stators of the two sets of rotors share one shell, only one set of cooling loop can be arranged, and the cooling design is simplified.

Description

Motor and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a motor and a vehicle.

Background

The wheel edge motor driving structure is characterized in that two motors are arranged on the wheel edge, and the motors are connected with a wheel hub through a motor shaft and a speed reducer. The hub motor driving structure is characterized in that a motor is embedded into a hub, and the motor directly drives a wheel to move forward.

For the wheel-side driving mode: two motors are arranged dispersedly, need draw forth 2 way cooling circuit from the radiator, are unfavorable for the heat pipe reason, and 2 motors have 2 sets of front and back end covers, are unfavorable for the lightweight of electric drive system.

For the hub drive mode: because the motor is arranged in the wheel hub, the unsprung mass is greatly increased, and meanwhile, the rotational inertia of the wheel hub is also increased, which is unfavorable for the controllability of a vehicle; and the electric brake can not meet the requirement of the braking performance of the whole vehicle, and needs to be added with mechanical brake, the mechanical brake is very difficult to design due to limited space, and the cooling design of the motor is also very difficult due to the space problem.

Disclosure of Invention

The invention discloses a motor and a vehicle, which are used for realizing the light weight of a driving system, avoiding the increase of the rotational inertia of a hub and facilitating cooling.

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

in a first aspect, there is provided an electric machine comprising: the motor comprises a shell, a first stator, a first rotor, a second stator and a second rotor, wherein the first stator, the first rotor, the second stator and the second rotor are positioned in the shell; the first rotor and the first stator are coaxial and rotate relatively, and the second rotor and the second stator are coaxial and rotate relatively; the output shaft of the first rotor and the output shaft of the second rotor both extend outside the housing.

In the motor, the first stator, the first rotor, the second stator and the second rotor are packaged in the same shell, so that the use of shell structures such as end covers and the like can be reduced, and the motor is beneficial to light weight; meanwhile, the shell independently encapsulates the internal structure, and the output shaft of the first rotor and the output shaft of the second rotor which extend out of the shell are used for driving a wheel respectively, so that a motor is not required to be arranged in a hub, and the increase of the rotational inertia of the hub is avoided; in addition, two sets of rotors and two sets of stators share one shell, so that only one set of cooling loop can be arranged, and the cooling design is simplified.

Optionally, the housing comprises a circumferential wall and first and second end caps at both ends of the circumferential wall; the first rotor and the second rotor are both arranged coaxially with the circumferential enclosing wall.

Optionally, the first rotor is located between the second rotor and the first end cover, the output shaft of the first rotor passing through the first end cover; the second rotor is located between the first rotor and the second end cover, and an output shaft of the second rotor penetrates through the second end cover.

Optionally, the first stator is annular, the first rotor being located within the first stator; the second stator is annular, and the second rotor is located in the second stator.

Optionally, the motor further comprises a first shaft sleeve, and the output shaft of the first rotor and the output shaft of the second rotor are connected through the first shaft sleeve.

Optionally, a cooling circuit is provided along the housing.

In a second aspect, a vehicle is provided, comprising: the device comprises a first wheel, a first transmission mechanism, a second wheel, a second transmission mechanism and a motor in any one technical scheme; the first wheel is connected with a first shaft, and the second wheel is connected with a second shaft; the output shaft of the first rotor is in transmission connection with the first shaft, and the output shaft of the second rotor is in transmission connection with the second shaft.

The vehicle and the motor have the same advantages compared with the prior art, and are not repeated herein.

Optionally, the vehicle further comprises a first transmission and a second transmission; the output shaft of the first rotor is not coaxial with the first shaft and is in transmission connection with the first shaft through the first transmission mechanism, and the output shaft of the second rotor is not coaxial with the second shaft and is in transmission connection with the second shaft through the second transmission mechanism.

Optionally, the vehicle further comprises a second bushing; the first shaft and the second shaft are coaxial and are connected through the second shaft sleeve.

Optionally, the electric machine is located between the first wheel and the second wheel; and the output shaft of the first rotor is coaxial with the first shaft and is directly in transmission connection with the first shaft, and the output shaft of the second rotor is coaxial with the second shaft and is directly in transmission connection with the second shaft.

Drawings

FIG. 1 is a schematic diagram of a portion of a vehicle according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a portion of another vehicle according to an embodiment of the present disclosure;

FIG. 3 is a flow chart of vehicle speed regulation according to an embodiment of the present application.

Icon: 1-a first output shaft; 2-a first drive gear; 3-a first driven gear; 4-a first shaft; 5-a second shaft sleeve; 6-a second output shaft; 7-a second driving gear; 8-a second driven gear; 9-a second axis; 10-a first sleeve; 11-a second end cap; 12-a first end cap; 13-a circumferential enclosure wall; 14-a steering wheel system; 15-a braking system; 16-a vehicle control unit; 17-a motor controller; 18-a first wheel; 19-a second vehicle; 20-an inlet; 21-an outlet; 22-a first stator; 23-a second stator; 24-a first rotor; 25-second rotor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to achieve the above object, the present invention provides the following technical solutions, with reference to fig. 1 to 3:

the motor that this application embodiment provided includes: a housing, and a first stator 22, a first rotor 24, a second stator 23, and a second rotor 25 located within the housing; the first rotor 24 and the first stator 22 are coaxial and rotate relatively, and the second rotor 25 and the second stator 23 are coaxial and rotate relatively; the output shaft of the first rotor 24 (denoted as first output shaft 1) and the output shaft of the second rotor 25 (denoted as second output shaft 6) both extend outside the housing.

In the motor, the first stator 22, the first rotor 24, the second stator 23 and the second rotor 25 are packaged in the same shell, so that the use of shell structures such as end covers can be reduced, and the motor is beneficial to light weight; meanwhile, the shell independently encapsulates the internal structure, and the first output shaft 1 and the second output shaft 6 extending out of the shell are used for driving a wheel respectively, so that a motor does not need to be arranged in a hub, and the increase of the rotational inertia of the hub is avoided; in addition, two sets of rotors and two sets of stators share one shell, so that only one set of cooling loop can be arranged, and the cooling design is simplified.

Specifically, the casing comprises a circumferential wall 13 and a first end cap 12 and a second end cap 11 located at the two ends of the circumferential wall 13; first rotor 24 and second rotor 25 all with the coaxial setting of circumference wall 13 to in first rotor 24 can stretch out through first end cover 12, second output shaft 6 can stretch out through second end cover 11, first end cover 12 and second end cover 11 all can be equipped with the output shaft that is used for corresponding the rotor and carry out the structure that rotates the support, like the bearing etc. in order to avoid taking place the friction, provide the outrigger simultaneously. In this structure, only a pair of end caps, namely, the first end cap 12 and the second end cap 11, is required, so that the structure of the housing is simplified, and the light weight is facilitated.

In a particular possible embodiment, the first rotor 24 is located between the second rotor 25 and the first end cap 12, the first output shaft 1 extending through the first end cap 12; the second rotor 25 is located between the first rotor 24 and the second end cap 11, and the second output shaft 6 penetrates the second end cap 11. I.e. so that the first output shaft 1 and the second output shaft 6 both extend through adjacent end caps 12, the two rotors being arranged axially, the output shafts extending through adjacent end caps in opposite directions, respectively.

In a specific exemplary embodiment, the first stator 22 is annular, and the first rotor 24 is positioned within the first stator 22, i.e., the first stator 22 surrounds the first rotor 24; the second stator 23 is annular and the second rotor 25 is located within the second stator 23, i.e. the second rotor 25 surrounds the second stator 23. This is not the only way, but it is also possible that the first rotor 24 surrounds the first stator 22 and the second stator 23 surrounds the second rotor 25.

In a specific possible embodiment, the electric machine further comprises a first bushing 10, the first output shaft 1 and the second output shaft 6 being connected by the first bushing 10. The first shaft sleeve 10 is internally provided with a bearing, and the rotating speeds of the first output shaft 1 and the second output shaft 6 can be out of synchronization.

In a particular possible embodiment, a cooling circuit is provided along the casing, for example along the circumferential wall 13, and has only one inlet 20 and one outlet 21.

Based on the same inventive concept, the embodiment of the present application provides a vehicle, including: a first wheel 18, a first transmission mechanism, a second wheel 19, a second transmission mechanism and the motor of any one of the above technical schemes; the first wheel 18 is connected with the first shaft 4, and the second wheel 19 is connected with the second shaft 9; the first output shaft 1 is in transmission connection with the first shaft 4, and the second output shaft 6 is in transmission connection with the second shaft 9.

In the vehicle, the first stator 22, the first rotor 24, the second stator 23 and the second rotor 25 are packaged in the same shell, so that the use of shell structures such as end covers can be reduced, and the light weight is facilitated; meanwhile, the shell independently encapsulates the internal structure, and the first output shaft 1 and the second output shaft 6 which extend out of the shell are used for driving one wheel respectively, so that a motor does not need to be arranged in a hub, and the increase of the rotational inertia of the hub is avoided; in addition, as the two sets of stators of the two sets of rotors share one shell, only one set of cooling loop can be arranged, and the cooling design is simplified.

In a particular embodiment, as shown in FIG. 1, the vehicle further includes a first transmission and a second transmission; the first output shaft 1 is not coaxial with the first shaft 4, and is in transmission connection with the first shaft 4 through a first transmission mechanism, for example, the first transmission mechanism may be a gear box, and specifically may include a first driving gear 2 directly connected with the first output shaft 1, and a first driven gear 3 in transmission connection with the first driving gear 2, the first driven gear 3 being mounted on the first shaft 4; the second output shaft 6 is not coaxial with the second shaft 9 and is in driving connection with the second shaft 9 through a second transmission mechanism, which, like the first transmission mechanism, may comprise a second driving gear 7 connected with the second output shaft 6 and a second driven gear 8 in driving connection with the second driving gear 7.

In a particular embodiment, the vehicle further comprises a second bushing 5; the first shaft 4 and the second shaft 9 are coaxial and are connected through a second shaft sleeve 5, a bearing is arranged in the second shaft sleeve 9, and the rotating speeds of the first shaft 4 and the second shaft 9 can be asynchronous.

In one particular embodiment, as shown in FIG. 2, the electric machine is located between the first wheel 18 and the second wheel 19; and the first output shaft 1 is coaxial with the first shaft 4 and is directly in transmission connection with the first shaft 4, and the second output shaft 6 is coaxial with the second shaft 9 and is directly in transmission connection with the second shaft 9.

In addition, in the vehicle, the first rotor 24 drives the first wheel 18 alone, and the second rotor 25 drives the second vehicle 19 alone, so that the conventional components such as a transmission shaft, a clutch, a differential and the like can be omitted, the structure is simplified, and the efficiency is improved.

The first rotor 24 and the first stator 22 are electrically and signal-connected to the motor controller (MCU for short in english) 17 through a set of three-phase high-voltage wires (solid lines) and a communication line (dotted line), the second rotor 25 and the second stator 23 are electrically and signal-connected to the motor controller 17 through a set of three-phase high-voltage wires (solid lines) and a communication line (dotted line), the motor controller 17 is signal-connected to the Vehicle Controller (VCU) 16 through a signal line, and the steering wheel system 14 and the brake system 15 are connected to the vehicle controller 16 through communication lines.

Referring to the flowchart of fig. 3, the vehicle control unit 16 acquires a rotation angle signal of the steering wheel system 14, an accelerator opening degree signal and a brake signal of the brake system 15, and obtains a target vehicle speed V0 through logical operation of the vehicle control unit 16, the vehicle control unit 16 provides the target vehicle speed V0 to the motor controller 17 through CAN communication, the motor controller 17 obtains a target output rotation speed V01 of the first output shaft 1 and a target output rotation speed V02 of the second output shaft 6 through logical operation, the motor controller 17 provides electric power to the motor through a three-phase high-voltage line, the motor converts the electric power into mechanical power to output, and the motor controller 17 CAN control the torque and the rotation speed output by the first output shaft 1 and the second output shaft 6 by adjusting the current magnitude and the frequency magnitude of three-phase alternating current input by the three-phase high-voltage line. The instantaneous rotational speed of the first output shaft 1 is V1, the instantaneous rotational speed of the second output shaft 6 is V2, and the motor controller 17 can control the rotational speeds of the first rotor 24 and the second rotor 25. When V1 is not equal to V01 or V2 is not equal to V02, the motor controller 17 continues to control the rotating speed of the motor; the target vehicle speed is reached when V1= V01, and V2= V02.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An electric machine, comprising: the motor comprises a shell, a first stator, a first rotor, a second stator and a second rotor, wherein the first stator, the first rotor, the second stator and the second rotor are positioned in the shell;

the first rotor and the first stator are coaxial and rotate relatively, and the second rotor and the second stator are coaxial and rotate relatively;

the output shaft of the first rotor and the output shaft of the second rotor both extend out of the housing;

an end cover is not arranged between the first rotor and the second rotor, an output shaft of the first rotor and an output shaft of the second rotor are coaxial and are only connected through a first shaft sleeve, and a bearing is arranged in the first shaft sleeve, so that the output shaft of the first rotor and the output shaft of the second rotor can be out of synchronization;

the housing is provided with a cooling circuit which is arranged along a circumferential enclosing wall of the housing and which has only one inlet and one outlet.

2. The electric machine of claim 1 wherein the housing comprises a circumferential perimeter wall and first and second end caps at either end of the circumferential perimeter wall;

the first rotor and the second rotor are both arranged coaxially with the circumferential enclosing wall.

3. The electric machine of claim 2 wherein the first rotor is positioned between the second rotor and the first end cap, the output shaft of the first rotor extending through the first end cap;

the second rotor is located between the first rotor and the second end cover, and an output shaft of the second rotor penetrates through the second end cover.

4. The electric machine of claim 1, wherein the first stator is annular, the first rotor being located within the first stator;

the second stator is annular, and the second rotor is located in the second stator.

5. The electric machine of claim 1, wherein a cooling circuit is disposed along the housing.

6. A vehicle, characterized by comprising: a first wheel, a second wheel, and the electric machine of any of claims 1 to 5;

the first wheel is connected with a first shaft, and the second wheel is connected with a second shaft;

the output shaft of the first rotor is in transmission connection with the first shaft, and the output shaft of the second rotor is in transmission connection with the second shaft.

7. The vehicle of claim 6, further comprising a first transmission and a second transmission;

the output shaft of the first rotor is not coaxial with the first shaft and is in transmission connection with the first shaft through the first transmission mechanism, and the output shaft of the second rotor is not coaxial with the second shaft and is in transmission connection with the second shaft through the second transmission mechanism.

8. The vehicle of claim 7, further comprising a second bushing;

the first shaft and the second shaft are coaxial and are connected through the second shaft sleeve.

9. The vehicle of claim 6, characterized in that the electric machine is located between the first wheel and the second wheel; and is provided with

The output shaft of the first rotor is coaxial with the first shaft and is directly in transmission connection with the first shaft, and the output shaft of the second rotor is coaxial with the second shaft and is directly in transmission connection with the second shaft.