WO2024032723A1

WO2024032723A1 - Electric drive system and design method therefor

Info

Publication number: WO2024032723A1
Application number: PCT/CN2023/112268
Authority: WO
Inventors: 高旭; 汤磊; 张广权; 陈进华
Original assignee: 上海盘毂动力科技股份有限公司
Priority date: 2022-08-10
Filing date: 2023-08-10
Publication date: 2024-02-15
Also published as: CN115276313A

Abstract

The present invention provides an electric drive system and a design method therefor. The electric drive system comprises at least one axial magnetic field motor and at least one speed reducer, wherein one axial side of the axial magnetic field motor is provided with an output end face. The design method comprises the following steps: (a) carrying out design according to the radial dimension of the axial magnetic field motor and the transmission ratio required by the electric drive system, so to obtain the speed reducer; and (b) connecting the output end face of the axial magnetic field motor to the side of the speed reducer facing away from the wheels, so to obtain the electric drive system. Taking advantage of the axial magnetic field motor having a small axial dimension and a large radial dimension, the design space utilization of the speed reducer can be further increased, and two such axial magnetic field motors and two such speed reducers can be arranged between the two wheels.

Description

An electric drive system and design method

Technical field

The present invention relates to the technical field of automobile electric drive, and in particular to an electric drive system and a design method.

Background technique

In recent years, the field of new energy vehicles has developed rapidly. Electric drive is one of the core components of new energy vehicles, and its characteristics determine the main performance indicators of the vehicle. Existing driving devices usually consist of a motor and a reducer, in which the motor is connected to the wheel transmission through the reducer to realize the movement of the wheel.

Since the wheelbase between the two wheels is fixed, the design of the reducer is limited by the wheelbase, and the motor needs to be equipped with a controller. In addition, as the demand for motor power and torque continues to increase, there will be a need to increase the number of motors. Demand further increases the difficulty of reducer design.

Contents of the invention

In order to solve the above problems, the present invention provides an electric drive system and a design method that have a compact structure and ensure a stable and reliable structure, and can be installed on two wheels with a certain wheelbase, and can also increase the utilization of the design space accordingly. .

According to one object of the present invention, the present invention provides a design method for an electric drive system. The electric drive system includes at least one axial magnetic field motor and at least one reducer. The axial magnetic field motor is provided on one side in the axial direction. There is an output end face, and the design method includes the following steps:

(a) Design the reducer according to the radial size of the axial magnetic field motor and the transmission ratio required by the electric drive system;

(b) Connect the output end face of the axial magnetic field motor to the side of the reducer away from the wheel to obtain the electric drive system.

As a preferred embodiment, the reducer includes a reducer housing and a transmission structure, and step (a) includes:

(a1) According to the radial size of the axial magnetic field motor, obtain the radial upper limit size of the reducer housing;

(a2) The transmission structure is designed based on the radial upper limit size of the reducer housing and the transmission ratio.

As a preferred embodiment, the transmission structure includes at least one driving wheel and at least one driven wheel. The driving wheel and the driven wheel are drivingly connected and arranged along the radial direction of the reducer housing, and then the step (a2) includes:

According to the transmission ratio, the driving wheel and the slave wheel are designed to meet the radial upper limit size of the reducer housing. Moving wheel.

As a preferred embodiment, the number of the axial magnetic field motor and the reducer is two respectively, and the step (b) includes:

Two of the axial magnetic field motors are connected between the two reducers, so that the wheels connected to each of the reducers are arranged outward, and each of the reducers is connected to the two adjacent sides of the reducer. The axial magnetic field motor is drivingly connected to the wheel.

As a preferred embodiment, the axial magnetic field motor has a motor circumference that defines its radial size, the reducer is a planetary gearbox, and the reducer has a reducer circumference that defines its radial size, so that the The above step (b) includes:

When the output end face of the axial magnetic field motor is connected to the side of the reducer away from the wheel, the motor periphery of the axial magnetic field motor is substantially flush with the reducer periphery of the reducer.

As a preferred embodiment, the electric drive system further includes at least one controller, and further includes after step (b):

(c) The controller 300 is connected to the motor periphery of the axial magnetic field motor, and the controller is electrically connected to the axial magnetic field motor.

According to another object of the present invention, the present invention also provides an electric drive system, including:

Two reducers, the reducer is a planetary gearbox, and the reducer is drivingly connected to one wheel;

Two axial magnetic field motors, one axial side of the axial magnetic field motor is provided with an output end face, and the output end face of the axial magnetic field motor is connected to the side of the reducer facing away from the wheel;

Wherein two of the axial magnetic field motors are connected between the two reducers, so that the wheels connected to each of the reducers are arranged outward, and each of the reducers and the axial directions on adjacent sides thereof The magnetic field motor is drivingly connected to the wheel;

The motor periphery of the axial magnetic field motor is substantially flush with the reducer periphery of the reducer.

As a preferred embodiment, it also includes:

At least one controller is connected to the motor periphery of the axial magnetic field motor, and the controller is electrically connected to the axial magnetic field motor.

As a preferred embodiment, the motor includes a motor housing, the controller includes a controller housing, and the reducer includes a reducer housing;

The motor housing and the controller housing are integrally connected, and/or the motor housing and the reducer housing are integrally connected.

As a preferred embodiment, the output end is recessed toward the inside of the axial magnetic field motor to form an accommodation cavity, and the reducer is partially embedded in the accommodation cavity.

As a preferred embodiment, the motor further includes at least a stator and at least one rotor, between the stator and the rotor An air gap surface is formed, and the air gap surface is parallel to the output end surface.

Compared with the existing technology, this technical solution has the following advantages:

First, the axial magnetic field motor has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that in this embodiment, the axial magnetic field motor and the reducer are arranged along the wheelbase. After being arranged in different directions and connected integrally, more space can be released between the two wheels with a certain wheel spacing to increase the design space of the reducer and satisfy the requirement of arranging two axles between the two wheels. to the magnetic field motor and the two reducers, etc.

Second, the reducer is designed with the radial size of the axial magnetic field motor as the upper limit and the transmission ratio. Since the radial size of the axial magnetic field motor can be much larger than the axial magnetic field The axial size of the motor can further increase the design space utilization of the reducer on the premise of ensuring that the overall space is small, and can be equipped with a reducer with a larger transmission ratio, so that the car starts to accelerate faster .

Third, each of the axial magnetic field motors can output power independently, eliminating the need for mechanical differentials. With electronic differentials, distributed drive can be achieved to help the entire vehicle achieve intelligent control. Due to the use of distributed drive, the vehicle has better control performance, a smaller turning radius, more stable control, and can effectively solve hill start and one-sided skidding.

Fourth, the two axial magnetic field motors and the two reducers are arranged symmetrically to ensure system stiffness and help improve the vehicle's noise, vibration and harshness (NVH) performance.

Fifth, the air gap surface of the axial magnetic field motor is parallel to the internal connection surface of the reducer, so that the axial magnetic field motor is effectively supported on the internal connection surface of the reducer to avoid the The reducer housing cannot bear the weight of the motor and may break, thereby improving the stability and reliability of the motor installation. In addition, in the design process of increasing the air gap surface to increase the motor torque, the load bearing capacity of the reducer housing is smaller and the design space is expanded.

The present invention will be further described below in conjunction with the accompanying drawings and examples.

Description of drawings

Figure 1 is a structural block diagram of the electric drive system of the present invention;

Figure 2 is a structural block diagram of the transmission structure of the present invention;

Figure 3 is a perspective view of the first embodiment of the electric drive system according to the present invention;

Figure 4 is a front view of the first embodiment of the electric drive system according to the present invention;

Figure 5 is an exploded view corresponding to the perspective view of the first embodiment of the electric drive system according to the present invention;

Figure 6 is an exploded view corresponding to the front view of the first embodiment of the electric drive system according to the present invention;

Figure 7 is a perspective view of the second embodiment of the electric drive system according to the present invention;

Figure 8 is an exploded view corresponding to the perspective view of the second embodiment of the electric drive system according to the present invention;

Figure 9 is an exploded view corresponding to the front view of the second embodiment of the electric drive system according to the present invention.

Detailed ways

The following description is provided to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments in the following description are only examples, and other obvious modifications may occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the invention.

First embodiment

Referring to Figure 1, the design method of the electric drive system includes at least one axial magnetic field motor 200 and at least one reducer 100. An output end face 2001 is provided on one axial side of the axial magnetic field motor 200. , the design method includes the following steps:

(a) According to the radial size of the axial magnetic field motor 200 and the transmission ratio required by the electric drive system, the reducer 100 is designed;

(b) Connect the output end face 2001 of the axial magnetic field motor to the side of the reducer 100 away from the wheel 400 to obtain the electric drive system.

The axial magnetic field motor 200 has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that in this embodiment, the axial magnetic field motor 200 and the reducer 100 are arranged along the wheelbase. After being arranged in different directions and connected integrally, more space can be released between the two wheels 400 with a certain wheel spacing, thereby increasing the design space of the reducer 100 and satisfying the requirement of arranging two wheels 400 between the two wheels 400 . The axial magnetic field motor 200 and the two reducers 100 and so on. In addition, the reducer 100 is designed with the radial size of the axial magnetic field motor 200 as the upper limit and the transmission ratio, and since the radial size of the axial magnetic field motor 200 can be much larger than the axial The axial size of the magnetic field motor 200 further increases the design space utilization of the reducer 100 on the premise of ensuring that the overall occupied space is small, and can be equipped with the reducer 100 with a larger transmission ratio, so that the automobile The faster the starting acceleration.

As shown in Figures 1 and 2, the reduction gearbox 100 is a planetary gearbox. The planetary gearbox is shorter in axial length and longer in radial length. Its shape can be changed from that of the axial magnetic field motor. Good coordination to improve its space utilization. Compared with traditional radial motors, the combination of planetary reduction gearbox and axial magnetic field motor can maintain the same volume. The planetary reduction gearbox has a larger radial size and can be designed with higher transmission ratio and output torque.

The reducer 100 includes a reducer housing 110 and a transmission structure 120, and the step (a) includes:

(a1) Based on the radial size of the axial magnetic field motor 200, obtain the radial upper limit size of the reducer housing 110.

The radial size of the axial magnetic field motor 200 is determined by its output torque. If the output torque of the axial magnetic field motor 200 is larger, the radial size of the axial magnetic field motor 200 will be larger. Therefore, the axial magnetic field motor 200 with corresponding radial size can be selected by determining the output torque according to the application environment of the electric drive system.

In step (a1), the radial upper limit size of the reducer housing 10 is determined based on the radial size of the axial magnetic field motor 200, that is, the radial size of the reducer housing 110 does not exceed the The radial size of the axial magnetic field motor 200 prevents the reducer 100 from protruding outside the axial magnetic field motor 200 in the radial direction, thereby increasing the overall occupied space.

(a2) The transmission structure 120 is designed based on the radial upper limit size of the reducer housing 110 and the transmission ratio.

The upper radial size of the reducer housing 110 can determine the complexity of the transmission structure 120 , and since the radial size of the axial magnetic field motor 200 can be much larger than the axial size of the axial magnetic field motor 200 Therefore, the reducer 100 with a large transmission ratio can be designed while ensuring that the overall space is small.

It is further explained that the larger the transmission ratio is, the greater the output torque of the reducer 100 will be, so that the car will start to accelerate faster. Similarly, the larger the transmission ratio is, the more complex the transmission structure 120 will be, and it will accommodate the The volume of the reducer housing 110 of the transmission structure 120 is also larger. The reducer housing 110 in this embodiment has a larger radial upper limit size, which increases the design space utilization of the reducer 100 while ensuring a small occupied space.

Further, referring to Figures 1 and 2, the transmission structure 120 includes at least one driving wheel 1211 and at least one driven wheel 1212. The driving wheel 1211 and the driven wheel 1212 are transmission connected and are connected along the reducer housing. The radial arrangement of 110, and then step (a2) includes:

According to the transmission ratio, the driving wheel 1211 and the driven wheel 1212 are designed to meet the radial upper limit size of the reducer housing 110 .

The number of the driving wheel 1211 and the driven wheel 1212 determines the number of transmission ratio stages of the transmission structure 120. The design process of the transmission structure 120 is introduced below by taking the primary transmission ratio shown in Figure 2 as an example. . The number of the driving wheel 1211 and the driven wheel 1212 is both one, that is, the transmission structure is a one-stage transmission. And the driven wheel 1212 is a ring gear and is fixedly installed. The driving wheel 1211 of the wheel set 121 is a sun gear. The driving wheel 1211 is rotatably arranged in the center of the ring gear and connected to the axial magnetic field motor 200 . In addition, a planet carrier 1214 is provided between the driving wheel 1211 and the driven wheel 1212, and the planet carrier 1214 is transmission connected to the wheel 400. In addition, planetary gears 1214 are drivingly connected between the planet carrier 1214 and the driving wheel 1211 and the driven wheel 1212 respectively.

Continuing to refer to FIG. 2 , the driving wheel 1211 and the driven wheel 1212 are arranged along the radial size of the reducer housing 110 , that is, the radial size of the reducer housing 110 is in line with the driving wheel 1211 and the driven wheel 1211 . The diameter of the driven wheel 1212 is related and can be calculated using the following formula:
n=1+R/r;

Wherein, n is the transmission ratio, R is the indexing circle radius of the driven wheel 1212, and r is the indexing circle radius of the driving wheel.

The transmission ratio may be determined by the output torque of the axial magnetic field motor 200 and the output torque of the reducer 100 , where the reducer 100 is the output torque required by the electric drive system, that is, the reducer 100 The output torque is divided by the output torque of the axial field motor 200 to obtain the transmission ratio. Based on this, by substituting the transmission ratio into the above calculation formula, and according to the radial upper limit size of the reducer housing 110, the driving wheel 1211 and the drive wheel 1211 accommodated in the reducer housing 110 can be obtained. Driven wheel 1212.

It should be noted that the actual radial size of the reducer housing 110 is not necessarily consistent with the upper radial size of the reducer housing 110 , that is, the actual radial size of the reducer housing 110 may be smaller than the actual radial size of the reducer housing 110 . The upper limit of the radial size of the reducer housing 110. The upper limit of the radial size of the reducer housing 110 refers to the maximum radial size that the reducer housing 110 can achieve to prevent the size from being too large and increasing the occupied space.

Of course, the transmission structure 120 can be two-level or above, then the above formula is adjusted as the radius of the indexing circle of the driven wheel ÷ the radius of the indexing circle of the driving wheel of all the meshed gear sets, and then the obtained results are compared. Multiply and add 1 to get the gear ratio.

It can be seen from the above that the reducer 100 is only adjusted in the radial dimension, while the axial dimension is almost unchanged. That is, while ensuring the small axial size, the design space of the reducer 100 can be increased, and the inability to be avoided can be avoided. It is installed between two wheels 400 with a certain wheel spacing, and it is impossible to continue to arrange the controller 300 and other equipment between the two wheels 400, so that the design space is restricted.

It can be seen that the reducer 100 can also have a disc-shaped structure like the axial magnetic field motor 200, thereby releasing space between the two wheels 300 and increasing the design space utilization. The axial magnetic field motor 200 also has the following features: when the power of the axial magnetic field motor 200 is designed, it is only adjusted in the radial direction of the axial magnetic field motor 200, and the axial size of the axial magnetic field motor 200 is almost unchanged. By effectively utilizing the design space utilization, not only the two axial magnetic field motors 200 and the two reducers 100 can be arranged between the two wheels 400, but also the controller 300 and the like can also be arranged.

For example, referring to Figure 1, Figure 6 and Figure 8, the number of the axial magnetic field motor 200 and the reducer 100 is two respectively, and the step (b) includes:

The two axial magnetic field motors 200 are connected between the two reducers 100 so that the wheels 400 connected to each reducer 100 are disposed outward and each reducer 100 is adjacent thereto. The axial magnetic field motor 200 and the wheel 400 on both sides are drivingly connected.

It can be seen that the two axial magnetic field motors 200 can output power independently, and with the electronic differential, the two wheels 400 can be Distributed drive helps the vehicle achieve intelligent control, a smaller turning radius, and more stable control, and effectively solves problems such as hill start and one-sided skidding.

Further, referring to Figures 1, 2, 5 and 6, the axial magnetic field motor 200 includes a motor housing 210, at least a stator, at least a rotor and an output shaft 220. The stator and the rotor The air gap is maintained inside the motor housing 210, that is, an air gap surface is formed between the stator and the rotor, and the air gap surface is parallel to the output end surface 2001 and the non-output end surface 2002 respectively. , the output shaft 220 passes through the stator and is fixedly connected with the rotor. The output shaft 220 also passes out of the motor housing 210 and is inserted into the reducer housing 110. It is transmission connected with the driving wheel 1211 of the transmission structure 120 for force transmission.

Further, an output end face 2001 and a non-output end face 2002 are respectively formed on both axial sides of the motor housing 210. The axial magnetic field motor is defined between the output end face 2001 and the non-output end face 2002. 200 axial dimensions. When assembled and connected, the output end face 2001 of the axial magnetic field motor 200 is integrally connected to the side of the reducer 100 facing away from the wheel 400 , and the non-output end faces 2002 of the two axial magnetic field motors 200 are integrally connected. , ensuring that the overall axial size can be arranged between the two wheels 400 with a certain wheel pitch.

The axial magnetic field motor 200 can be divided into a single stator double rotor axial magnetic field motor, a single stator single rotor axial magnetic field motor, etc. according to the number of stators and rotors. Taking a single-stator dual-rotor axial magnetic field motor as an example, the two rotors are maintained on both sides of the stator with an air gap, and are arranged closely with the reducer 100 and the other axial magnetic field motor 200 on both sides. , the fit setting means that the two are almost close to each other to shorten the distance between the two, thereby making the structure more compact.

As shown in Figures 1 and 6, the axial magnetic field motor 200 has a motor circumference 2003 defining its radial size. The motor circumference 2003 extends and is connected between the output end face 2001 and the non-output end face 2002, so The reducer 100 has a reducer periphery 1003 defining its radial size, and the step (b) includes:

When the output end face 2001 of the axial magnetic field motor 200 is connected to the side of the reducer 100 away from the wheel, the motor peripheral edge 2003 of the axial magnetic field motor 200 is substantially aligned with the reducer peripheral edge 1003 of the reducer 100 flat.

It should be noted that when the designed actual radial size of the reducer housing 110 is consistent with the radial size of the axial magnetic field motor 200, then the motor peripheral edge 2003 and the reducer of both The perimeter 1003 is completely flush. However, this embodiment is not limited to the fact that the actual radial size of the reducer housing 110 is smaller than the radial size of the axial magnetic field motor 200 , so there may be situations where it is not flush at all, or some edges are flush.

To further explain, both sides of the reducer housing 110 in the axial direction form an inner connection surface 1002 and an outer connection surface 1001 respectively. The inner connection surface 1002 and the outer connection surface 1001 define the reducer. The reducer peripheral edge 1003 extends and is connected between the inner connection surface 1002 and the outer connection surface 1001 , wherein the inner connection surface 1002 is connected to the output end surface of the axial magnetic field motor 200 2001 are integrally connected, and the outer connection surface 1001 faces Wheel 400 set.

The reducer peripheral edge 1003 of the reducer 100 gradually decreases from the inner connection surface 1002 to the outer connection surface 1001, so that the reducer 100 is in the shape of a truncated cone, and its inner connection surface 1002 can be connected with the axial magnetic field motor 200 The motor peripheral edge 2003 is arranged flush, so the outer connecting surface 1001 must be located in the area surrounded by the motor peripheral edge 2003.

Preferably, the air gap surface of the axial magnetic field motor 200 is parallel to the inner connection surface 1002 so that the axial magnetic field motor 200 is effectively supported on the inner connection surface 1002 of the reducer 100 , to prevent the reducer housing 110 from breaking.

In an example, as shown in Figures 3 to 6, the electric drive system further includes a controller 300, and after step (b), it further includes:

(c) Connect the controller 300 to the motor periphery 2003 of the two axial magnetic field motors 200, and the controller 300 is electrically connected to the two axial magnetic field motors 200 respectively.

In another example, as shown in FIGS. 7 to 9 , the electric drive system further includes two controllers 300 , and further includes after step (b):

(c) Each controller 300 is respectively connected to the motor peripheral edge 2003 of one of the axial magnetic field motors 200, and the controller 300 is electrically connected to the axial magnetic field motor 200 to which it is connected. The two controllers 300 can be integrally connected, and of course can also be arranged staggered.

The controller housing 310 of the controller 300 and the motor housing 210 of the axial magnetic field motor 200 share a housing, and the two can be integrated, thus omitting the axial magnetic field motor 200 and the control unit. The high-voltage wire harness and the low-voltage wire harness between the controller 300 make the structure more compact and simple, while reducing the manufacturing cost.

Of course, the motor peripheral edge 2003 of the axial magnetic field motor 200 is provided with an interface. When the controller 300 is integrally connected to the motor peripheral edge 2003, it is electrically connected to the axial magnetic field motor 200 through the interface on it. It can also avoid the wiring harness being exposed and increasing the occupied space, and avoid the wiring harness connection process.

Referring to FIG. 6 , the controller 300 has a flat structure. Whether it is a single controller 300 or two controllers 300 , its overall length is less than the sum of the axial dimensions of the two axial magnetic field motors 200 .

As shown in Figure 1 , the axial magnetic field motors 200 on both sides and the reducers 100 on both sides are arranged correspondingly to ensure system stiffness and help improve the noise, vibration and harshness (NVH) of the entire vehicle. performance.

To sum up, the axial magnetic field motor 200 has the characteristics of small axial size, higher power density, lighter weight and greater torque output. It can be seen that this embodiment combines the axial magnetic field motor 200 with the reduction gear. After the reducer 100 is arranged along the wheelbase direction and connected integrally, more space can be released between the two wheels 400 of a certain wheelbase, thereby increasing the design space of the reducer 100 and satisfying the requirements between the two wheels 400 Arranged between the two axial magnetic field motors 200 and the two reducing Speed 100 and so on. In addition, the reducer 100 is designed with the radial size of the axial magnetic field motor 200 as the upper limit and the transmission ratio, and since the radial size of the axial magnetic field motor 200 can be much larger than the axial The axial size of the magnetic field motor 200 further increases the design space utilization of the reducer 100 on the premise of ensuring that the overall occupied space is small, and can be equipped with the reducer 100 with a larger transmission ratio, so that the automobile The faster the starting acceleration.

Second embodiment

As shown in Figures 1 to 9, the electric drive system includes:

Two reducers 100, the reducer 100 is a planetary gearbox, and the reducer 100 is drivingly connected to a wheel 400;

Two axial magnetic field motors 200. One axial side of the axial magnetic field motor 200 is provided with an output end face 2001. The output end face 2001 of the axial magnetic field motor 200 is connected to the side of the reducer 100 facing away from the wheel 400. ;

Two of the axial magnetic field motors 200 are connected between the two reducers 100 so that the wheels 400 connected to each reducer 100 are arranged outward, and each reducer 100 is connected to its adjacent two sides. The axial magnetic field motor 200 and the wheel 400 are transmission connected;

The motor peripheral edge 2003 of the axial magnetic field motor 200 is substantially flush with the reducer peripheral edge 1003 of the reducer 100 .

The electric drive system can be designed by the above design method. Therefore, the advantage that the axial size of the axial magnetic field motor 200 is small is significantly smaller than the radial size, and the reducer 100 is integrally connected to the axial magnetic field motor 200 On the output end face 2001 on the axial side, more space can be released between the two wheels 400 with a certain wheel pitch, further increasing the design space utilization of the reducer 100.

As shown in Figures 3 to 9, the electric drive system also includes:

At least one controller 300 is connected to the motor periphery 2003 of the axial magnetic field motor 200, and the controller 300 is electrically connected to the axial magnetic field motor 200.

The number of the controller 300 may be one or two. When the number of the controller 300 is one, the controller 300 is electrically connected to the two axial magnetic field motors 200 respectively. When the number of controllers 300 is two, each controller 300 is electrically connected to one axial magnetic field motor 200 respectively. In addition, the controller 300 can be integrated with the axial magnetic field motor, or the two can be integrally connected through fasteners.

As shown in Figures 3 to 9, the motor 200 includes a motor housing 210, the controller 300 includes a controller housing 310, and the reducer 100 includes a reducer housing 110;

The motor housing 210 and the controller housing 310 are integrally connected, and/or the motor housing 210 and the reducer housing 110 are integrally connected.

Taking the motor housing 210 and the reducer housing 110 as an example, a plurality of bolts 500 can be used between the two. Tightly fixed, wherein the bolts 500 are provided on the periphery of the motor housing 210 and the reducer housing 110 and can be hidden inside to make the structure compact and prevent the occupied space from becoming larger.

In addition, the motor housing 210 may have a split structure to be suitable for installing a dual-rotor single-stator axial magnetic field motor. Referring to Figure 6, the motor housing 210 includes a middle housing 211 and two side housings 212. The stator is installed in the middle housing 211, and a stator is installed in each side housing 212. For the rotor, when both sides of the middle housing 211 are fixed with bolts to the two side housings 212, the two rotors are held on both sides of the stator in the axial direction with an air gap.

Continuing to refer to FIGS. 3 to 9 , reinforcing ribs may be provided on the periphery of the motor housing 210 , the reducer housing 110 and the controller housing 310 to ensure structural strength.

As shown in Figures 5 and 8, the output end surface 2001 is recessed into the axial magnetic field motor 200 to form an accommodation cavity 20011, and the reducer 100 is partially embedded in the accommodation cavity 20011 to shorten the overall shaft. direction size.

In addition, the non-output end face 2002 is also recessed toward the inside of the axial magnetic field motor 200 to form a second accommodation cavity 20021, which can accommodate cooling structures and resolver structures. The cold zone structure can be a cooling tube for cooling. Medium (including cooling liquid or cooling gas) to cool down the axial magnetic field motor 200 . Of course, a cooling structure can also be arranged in the accommodation cavity 20011 of the output end surface 2001, that is, while ensuring that the overall axial size can be accommodated between the two wheels 400, the cooling function can be increased accordingly.

Referring to Figures 1 and 6, the reducer 100 is fixed, and the axial magnetic field motor 200 is installed to the side of the reducer 100 away from the wheel 400, that is, the axial magnetic field motor 200 is supported on on the reducer housing 110. Preferably, the axial magnetic field motor 200 further includes at least a stator and at least one rotor, an air gap surface is formed between the stator and the rotor, and the air gap surface is parallel to the internal connection surface 1002 , so that the axial magnetic field motor 200 is effectively supported on the inner connection surface 1002 of the reducer 100 . Therefore, the distance between the center of gravity of the axial magnetic field motor 200 and the reducer 100 can be shortened, and the force arm is smaller, so that the bending moment generated is smaller, the stability and reliability of the motor installation are improved, and the reducer 100 is avoided. The casing 110 cannot bear the weight of the motor and may break. In addition, during the design process of increasing the air gap surface to increase the motor torque, the force arm always maintains a smaller range, which places a smaller load on the reducer housing 110 and expands the design space.

The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The present invention cannot be limited only by this embodiment. The patent scope means that all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

A design method for an electric drive system, characterized in that the electric drive system includes at least one axial magnetic field motor (200) and at least one reducer (100), and the axial magnetic field motor (200) has an axial The side is provided with an output end face (2001), and the design method includes the following steps:

(a) Design the reducer (100) according to the radial size of the axial magnetic field motor (200) and the transmission ratio required by the electric drive system;

(b) Connect the output end face (2001) of the axial magnetic field motor to the side of the reducer (100) away from the wheel (400) to obtain the electric drive system.
The design method of an electric drive system according to claim 1, wherein the reducer (100) includes a reducer housing (110) and a transmission structure (120), and the step (a) includes :

(a1) Obtain the radial upper limit size of the reducer housing (110) based on the radial size of the axial magnetic field motor (200);

(a2) The transmission structure (120) is designed based on the radial upper limit size of the reducer housing (110) and the transmission ratio.
The design method of an electric drive system according to claim 2, characterized in that the transmission structure (120) includes at least one driving wheel (1211) and at least one driven wheel (1212), and the driving wheel (1211) and The driven wheel (1212) is transmission connected and arranged along the radial direction of the reducer housing (110), and the step (a2) includes:

According to the transmission ratio, the driving wheel (1211) and the driven wheel (1212) are designed to meet the radial upper limit size of the reducer housing (110).
The design method of an electric drive system according to claim 1, characterized in that the number of the axial magnetic field motor (200) and the reducer (100) is two respectively, and the step (b) includes:

The two axial magnetic field motors (200) are connected between the two reducers (100), so that the wheels (400) connected to each reducer (100) are arranged outward, and each The reducer (100) is drivingly connected to the axial magnetic field motor (200) and the wheels (400) on its adjacent sides.
The design method of an electric drive system according to claim 1, characterized in that the axial magnetic field motor (200) has a motor periphery (2003) defining its radial size, and the reducer (100) is a planetary Wheel reduction gearbox, the reducer (100) has a reducer periphery (1003) defining its radial size, and the step (b) includes:

When the output end face (2001) of the axial magnetic field motor (200) is connected to the side of the reducer (100) away from the wheel, the motor peripheral edge (2003) of the axial magnetic field motor (200) is connected to the side of the reducer (100). The reducer periphery (1003) of the reducer (100) is approximately flush.
An electric drive system is characterized by including:

Two reducers (100), the reducer (100) is a planetary gearbox, and the reducer (100) is drivingly connected to a wheel (400);

Two axial magnetic field motors (200), one axial side of the axial magnetic field motor (200) is provided with an output end face (2001), and the output end face (2001) of the axial magnetic field motor (200) is connected to the deceleration The side of the device (100) facing away from the wheel (400);

Two of the axial magnetic field motors (200) are connected between the two reducers (100), so that the wheels (400) connected to each of the reducers (100) are arranged outward, and each of the The reducer (100) is drivingly connected to the axial magnetic field motor (200) and the wheels (400) on its adjacent sides;

The motor peripheral edge (2003) of the axial magnetic field motor (200) is substantially flush with the reducer peripheral edge (1003) of the reducer (100).
The electric drive system of claim 6, further comprising:

At least one controller (300), the controller (300) is connected to the motor periphery (2003) of the axial magnetic field motor (200), and the controller (300) and the axial magnetic field motor (200 ) electrical connection.
The electric drive system of claim 7, wherein the motor (200) includes a motor housing (210), the controller (300) includes a controller housing (310), and the reducer (100) includes a reducer housing (110);

The motor housing (210) and the controller housing (310) are integrally connected, and/or the motor housing (210) and the reducer housing (110) are integrally connected.
The electric drive system according to claim 6, characterized in that the output end surface (2001) is recessed toward the inside of the axial magnetic field motor (200) to form an accommodation cavity (20011), and the reducer (100) part Embedded in the containing cavity (20011).
The electric drive system of claim 6, wherein the motor (200) further includes at least a stator and at least one rotor, an air gap surface is formed between the stator and the rotor, and the air gap The surface is parallel to the output end surface (2001).