An electric drive system and design method

Abstract

The application provides an electric drive system and a design method, the electric drive system comprises at least one axial magnetic field motor and at least one speed reducer, one side of the axial magnetic field motor in the axial direction is provided with an output end face, the design method comprises the following steps: (a) according to the radial dimension of the axial magnetic field motor and the required transmission ratio of the electric drive system, the speed reducer is designed; (b) the output end face of the axial magnetic field motor is connected to the side of the speed reducer away from the wheel, so as to obtain the electric drive system, by taking the advantage that the axial magnetic field motor has small axial dimension and large radial dimension, the utilization rate of the design space of the speed reducer is further increased, and two axial magnetic field motors and two speed reducers can be arranged between two wheels.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric drive technology of automobile, and particularly relates to an electric drive system and a design method. BACKGROUND

[0002] In recent years, the field of new energy vehicles has developed rapidly, and electric drive, as one of the core components of new energy vehicles, determines the main performance indicators of vehicle driving. The existing drive device is usually composed of a motor and a reducer, wherein the motor is connected with the wheels in transmission through the reducer to realize the movement of the wheels.

[0003] Since the wheel track between the two wheels is certain, the design of the reducer is limited by the wheel track, and the motor also needs to be equipped with a controller, etc. In addition, as the power and torque of the motor need to be continuously improved, there is also a demand to increase the number of motors, which further increases the design difficulty of the reducer. SUMMARY

[0004] In order to solve the above problems, the present application provides an electric drive system and a design method which are compact in structure and stable and reliable in structure, and can be installed on two wheels with a certain wheel track, and can also correspondingly increase the utilization rate of design space.

[0005] According to one object of the present application, the present application provides a design method of an electric drive system, the electric drive system comprising at least one axial magnetic field motor and at least one reducer, one side of the axial magnetic field motor in the axial direction being provided with an output end face, the design method comprising the following steps:

[0006] (a) designing the reducer according to the radial dimension of the axial magnetic field motor and the required transmission ratio of the electric drive system;

[0007] (b) connecting the output end face of the axial magnetic field motor to the side of the reducer away from the wheels to obtain the electric drive system.

[0008] As a preferred embodiment, the reducer comprises a reducer housing and a transmission structure, and further the step (a) comprises:

[0009] (a1) obtaining the upper limit dimension of the reducer housing in the radial direction according to the radial dimension of the axial magnetic field motor;

[0010] (a2) designing the transmission structure according to the upper limit dimension of the reducer housing in the radial direction and the transmission ratio.

[0011] As a preferred embodiment, the transmission structure comprises at least one driving wheel and at least one driven wheel, the driving wheel and the driven wheel are in transmission connection and are arranged in the radial direction of the reducer housing, and further the step (a2) comprises:

[0012] According to the transmission ratio, the driving wheel and the driven wheel are designed to meet the radial upper limit size of the reducer housing.

[0013] As a preferred embodiment, the number of the axial magnetic field motor and the reducer is two respectively, and the step (b) comprises:

[0014] The two axial magnetic field motors are connected between the two reducers, so that the wheels connected by each reducer are arranged outward, and each reducer is drivingly connected with the axial magnetic field motor and the wheel on its two adjacent sides.

[0015] As a preferred embodiment, the axial magnetic field motor has a motor circumference defining its radial size, the reducer is a planetary gear reducer, the reducer has a reducer circumference defining its radial size, and the step (b) comprises:

[0016] When the output end surface of the axial magnetic field motor is connected to the side of the reducer away from the wheel, the motor circumference of the axial magnetic field motor is substantially flush with the reducer circumference of the reducer.

[0017] As a preferred embodiment, the electric drive system further comprises at least one controller, and the step (b) further comprises:

[0018] (c) connecting the controller 300 to the motor circumference of the axial magnetic field motor, and the controller and the axial magnetic field motor are electrically connected.

[0019] According to another object of the present application, the present application further provides an electric drive system, comprising:

[0020] Two reducers, the reducer is a planetary gear reducer, and the reducer is drivingly connected with a wheel;

[0021] Two axial magnetic field motors, one side of the axial magnetic field motor is provided with an output end surface, and the output end surface of the axial magnetic field motor is connected to the side of the reducer away from the wheel;

[0022] The two axial magnetic field motors are connected between the two reducers, so that the wheels connected by each reducer are arranged outward, and each reducer is drivingly connected with the axial magnetic field motor and the wheel on its two adjacent sides.

[0023] The motor circumference of the axial magnetic field motor is substantially flush with the reducer circumference of the reducer.

[0024] As a preferred embodiment, it further comprises:

[0025] At least one controller connected to the motor periphery of the axial magnetic field motor, and the controller and the axial magnetic field motor are electrically connected.

[0026] As a preferred embodiment, the motor comprises a motor housing, the controller comprises a controller housing, and the reducer comprises a reducer housing.

[0027] The motor housing and the controller housing are integrally connected, and / or the motor housing and the reducer housing are integrally connected.

[0028] As a preferred embodiment, the output end is recessed to form a receiving cavity inside the axial magnetic field motor, and the reducer part is embedded in the receiving cavity.

[0029] As a preferred embodiment, the motor further comprises at least one stator and at least one rotor, and an air gap surface is formed between the stator and the rotor, and the air gap surface is parallel to the output end surface.

[0030] Compared with the prior art, the technical scheme has the following advantages:

[0031] First, the axial magnetic field motor has the characteristics of small axial size, higher power density, lighter mass, and larger torque output, etc. It can be seen that after arranging the axial magnetic field motor and the reducer along the wheel distance direction and integrally connecting them, more space can be released between the two wheels of a certain wheel distance to increase the design space of the reducer, and two axial magnetic field motors and two reducers can be arranged between the two wheels.

[0032] Second, the reducer is designed with the radial size of the axial magnetic field motor as the upper limit and the transmission ratio, and since the radial size of the axial magnetic field motor can be much larger than the axial size of the axial magnetic field motor, the design space utilization rate of the reducer is further increased under the premise of ensuring small overall space occupation, and the reducer with a larger transmission ratio can be equipped to make the car start faster.

[0033] Third, each axial magnetic field motor can output power independently, eliminating the need for mechanical differential, and cooperating with electronic differential to realize distributed driving and help the whole vehicle realize intelligent control. Due to the use of distributed driving, the whole vehicle has better control performance, smaller turning radius, and more stable control, effectively solving the problems of hill starting and single-side slipping.

[0034] Fourth, two axial magnetic field motors and two reducers are respectively and symmetrically arranged to ensure system stiffness and improve the noise, vibration, and harshness (NVH) performance of the whole vehicle.

[0035] Fifthly, the air gap surface of the axial magnetic field motor is parallel to the inner connecting surface of the speed reducer, so that the axial magnetic field motor is effectively supported on the inner connecting surface of the speed reducer, avoiding the phenomenon that the speed reducer shell cannot bear the weight of the motor and is broken, and improving the stability and reliability of the motor installation. Moreover, in the design process of increasing the air gap surface to increase the torque of the motor, the load on the speed reducer shell is smaller, and the design space is expanded.

[0036] The application will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The structure block diagram of the electric drive system is shown in the figure;

[0038] Figure 2 The structure block diagram of the transmission structure is shown in the figure;

[0039] Figure 3 The perspective view of the first embodiment of the electric drive system is shown in the figure;

[0040] Figure 4 The front view of the first embodiment of the electric drive system is shown in the figure;

[0041] Figure 5 The exploded view corresponding to the perspective view of the first embodiment of the electric drive system is shown in the figure;

[0042] Figure 6 The exploded view corresponding to the front view of the first embodiment of the electric drive system is shown in the figure;

[0043] Figure 7 The perspective view of the second embodiment of the electric drive system is shown in the figure;

[0044] Figure 8 The exploded view corresponding to the perspective view of the second embodiment of the electric drive system is shown in the figure;

[0045] Figure 9 The exploded view corresponding to the front view of the second embodiment of the electric drive system is shown in the figure. DETAILED DESCRIPTION

[0046] The following description is provided to enable any person skilled in the art to practice the application. The preferred embodiments in the following description are only examples of implementing the application and other obvious modifications are possible to those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the application.

[0047] First embodiment

[0048] ReferenceFigure 1 The design method of the electric drive system, the electric drive system comprising at least one axial magnetic field motor 200 and at least one reducer 100, the axial magnetic field motor 200 being provided with an output end face 2001 on one axial side, the design method comprising the following steps:

[0049] (a) According to the radial dimension of the axial magnetic field motor 200 and the required transmission ratio of the electric drive system, the reducer 100 is designed.

[0050] (b) The output end face 2001 of the axial magnetic field motor is connected to the side of the reducer 100 away from the wheel 400 to obtain the electric drive system.

[0051] The axial magnetic field motor 200 has the characteristics of small axial dimension, higher power density, lighter mass and larger torque output. It can be seen that the axial magnetic field motor 200 and the reducer 100 are arranged along the wheel pitch direction and integrally connected, which can release more space between the two wheels 400 to increase the design space of the reducer 100, and can meet the arrangement of two axial magnetic field motors 200 and two reducers 100 between the two wheels 400. In addition, the reducer 100 is designed with the radial dimension of the axial magnetic field motor 200 as the upper limit and the transmission ratio. Since the radial dimension of the axial magnetic field motor 200 can be much larger than the axial dimension of the axial magnetic field motor 200, the design space utilization rate of the reducer 100 is further increased under the premise of ensuring small overall space occupation, and the reducer 100 with larger transmission ratio can be equipped to make the car start faster.

[0052] As shown in Figure 1 and Figure 2 , the reducer 100 is a planetary gear reducer. The planetary gear reducer is shorter in axial length and longer in radial length, which can better match the shape of the axial magnetic field motor to improve the space utilization. Compared with the traditional radial motor, the combination of the planetary gear reducer and the axial magnetic field motor can have a larger radial dimension under the premise of maintaining the same volume, and a higher transmission ratio and output torque can be designed.

[0053] The reducer 100 comprises a reducer housing 110 and a transmission structure 120, and the step (a) comprises:

[0054] (a1) According to the radial dimension of the axial magnetic field motor 200, the upper limit dimension of the reducer housing 110 in the radial direction is obtained.

[0055] The radial dimension of the axial magnetic field motor 200 is determined by its output torque, the greater the output torque of the axial magnetic field motor 200, the greater the radial dimension of the axial magnetic field motor 200. Therefore, according to the application environment of the electric drive system, the axial magnetic field motor 200 with a corresponding radial dimension can be selected by determining the output torque.

[0056] In step (a1), the radial upper limit dimension of the reducer housing 110 is determined according to the radial dimension of the axial magnetic field motor 200, that is, the radial dimension of the reducer housing 110 does not exceed the radial dimension of the axial magnetic field motor 200, preventing the reducer 100 from protruding radially outside the axial magnetic field motor 200 and increasing the overall occupied space.

[0057] (a2) The transmission structure 120 is designed according to the radial upper limit dimension of the reducer housing 110 and the transmission ratio.

[0058] The radial upper limit dimension of the reducer housing 110 can determine the complexity of the transmission structure 120, and since the radial dimension of the axial magnetic field motor 200 can be much larger than the axial dimension of the axial magnetic field motor 200, the reducer 100 with a large transmission ratio can be designed under the premise of ensuring a small overall occupied space.

[0059] Further, the greater the transmission ratio, the greater the output torque of the reducer 100, making the car start and accelerate faster. Similarly, the greater the transmission ratio, the more complex the transmission structure 120, and the larger the volume of the reducer housing 110 that accommodates the transmission structure 120. The reducer housing 110 of the embodiment has a large radial upper limit dimension, which increases the design space utilization rate of the reducer 100 under the premise of ensuring a small occupied space.

[0060] Further, referring to Figure 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 in transmission connection and arranged along the radial direction of the reducer housing 110, and the step (a2) includes:

[0061] According to the transmission ratio, the driving wheel 1211 and the driven wheel 1212 that meet the radial upper limit dimension of the reducer housing 110 are designed.

[0062] The number of driving wheels 1211 and driven wheels 1212 determines the transmission ratio of the transmission structure 120, and the following is Figure 2The primary transmission ratio is shown as an example to introduce the design process of the transmission structure 120. The number of the driving wheel 1211 and the driven wheel 1212 is one, that is, the transmission structure is a primary transmission. The driven wheel 1212 is a gear ring and is fixedly arranged. The driving wheel 1211 of the wheel set 121 is a sun gear, which is rotatably arranged at the center of the gear ring and is connected to the axial magnetic field motor 200. In addition, the planetary carrier 1214 is arranged between the driving wheel 1211 and the driven wheel 1212, and the planetary carrier 1214 is in transmission connection with the wheel 400. The planetary carrier 1214 is in transmission connection with the driving wheel 1211 and the driven wheel 1212, respectively.

[0063] With reference to the foregoing Figure 2 , the driving wheel 1211 and the driven wheel 1212 are arranged along the radial dimension of the reducer housing 110, that is, the radial dimension of the reducer housing 110 is related to the diameter of the driving wheel 1211 and the driven wheel 1212, and can be calculated by the following formula:

[0064] n = 1 + R / r;

[0065] Wherein, n is the transmission ratio, R is the reference circle radius of the driven wheel 1212, and r is the reference circle radius of the driving wheel.

[0066] The transmission ratio can be determined by the output torque of the axial magnetic field motor 200 and the output torque of the reducer 100, wherein the output torque of the reducer 100 is the required output torque of the electric drive system, that is, the transmission ratio is obtained by dividing the output torque of the reducer 100 by the output torque of the axial magnetic field motor 200. Based on this, the transmission ratio is substituted into the above calculation formula, and according to the upper limit of the radial dimension of the reducer housing 110, the driving wheel 1211 and the driven wheel 1212 accommodated in the reducer housing 110 can be obtained.

[0067] It should be noted that the actual radial dimension of the reducer housing 110 does not necessarily coincide with the upper limit of the radial dimension of the reducer housing 110, that is, the actual radial dimension of the reducer housing 110 can be smaller than the upper limit of the radial dimension of the reducer housing 110. The upper limit of the radial dimension of the reducer housing 110 refers to the maximum radial dimension that can be achieved to prevent the size from being too large and increasing the occupied space.

[0068] Of course, the transmission structure 120 can be two or more levels, and the above formula is adjusted to divide the reference circle radius of the driven wheel of the gear pair by the reference circle radius of the driving wheel, and then multiply the obtained results and add 1 to obtain the transmission ratio.

[0069] From the above, the reducer 100 is only adjusted in the radial dimension, and the axial dimension is almost unchanged, that is, the design space of the reducer 100 can be increased while ensuring the advantage of small axial dimension, and the reducer 100 cannot be installed between two wheel tracks of the wheels 400, and the controller 300 and other devices cannot be arranged between the two wheels 400, so that the design space is constrained.

[0070] It can be seen that the reducer 100 can also be disc-shaped like the axial field motor 200, thereby releasing space between the two wheels 300 and increasing the utilization rate of the design space. The axial field motor 200 also has the characteristics that when the axial field motor 200 is designed, only the radial dimension of the axial field motor 200 is adjusted, and the axial dimension of the axial field motor 200 is almost unchanged, thereby effectively utilizing the design space, and not only two axial field motors 200 and two reducers 100 can be arranged between the two wheels 400, but even the controller 300 and other devices can be arranged.

[0071] For example, referring to Figure 1 , Figure 6 and Figure 8 , the number of axial field motors 200 and reducers 100 is two respectively, and the step (b) comprises:

[0072] The two axial field motors 200 are connected between the two reducers 100, so that the wheels 400 connected by each reducer 100 are arranged outward, and each reducer 100 is drivingly connected with the axial field motor 200 and the wheel 400 adjacent to the two sides thereof.

[0073] It can be seen that the two axial field motors 200 can independently output power, and can be distributedly driven by cooperating with electronic differential to help the whole vehicle realize intelligent control, and have smaller turning radius and more stable control, and effectively solve the problems of uphill and single-side skidding.

[0074] Further, referring to Figure 1 , Figure 2 , Figure 5 and Figure 6The axial magnetic field motor 200 comprises a motor housing 210, at least one stator, at least one rotor and an output shaft 220, the stator and the rotor air gap are kept inside the motor housing 210, that is, the stator and the rotor form an air gap surface, the air gap surface is parallel to the output end surface 2001 and the non-output end surface 2002 respectively, the output shaft 220 penetrates the stator and is fixedly connected with the rotor, and the output shaft 220 also penetrates out of the motor housing 210 and is inserted into the reducer housing 110, and is in driving connection with the driving wheel 1211 of the transmission structure 120 to transmit force.

[0075] Further, the axial two sides of the motor housing 210 form an output end surface 2001 and a non-output end surface 2002 respectively, and the output end surface 2001 and the non-output end surface 2002 define the axial dimension of the axial magnetic field motor 200. When assembled and connected, the output end surface 2001 of the axial magnetic field motor 200 is integrally connected with the side of the reducer 100 away from the wheel 400, and the non-output end surfaces 2002 of the two axial magnetic field motors 200 are integrally connected, so that the overall axial dimension can be arranged between the two wheels 400 with a certain wheel track.

[0076] The axial magnetic field motor 200 can be divided into single-stator double-rotor axial magnetic field motor, single-stator single-rotor axial magnetic field motor and the like according to the number of stators and rotors. Taking the single-stator double-rotor axial magnetic field motor as an example, the two rotor air gaps are kept on both sides of the stator, and are arranged in close contact with the reducer 100 and the other axial magnetic field motor 200 on both sides, which means that the two are almost in close contact to shorten the distance between them, thereby making the structure more compact.

[0077] As shown in Figure 1 and Figure 6 The axial magnetic field motor 200 has a motor circumference 2003 defining its radial dimension, the motor circumference 2003 extends and connects between the output end surface 2001 and the non-output end surface 2002, the reducer 100 has a reducer circumference 1003 defining its radial dimension, and then the step (b) comprises:

[0078] When the output end surface 2001 of the axial magnetic field motor 200 is connected to the side of the reducer 100 away from the wheel, the motor circumference 2003 of the axial magnetic field motor 200 is approximately flush with the reducer circumference 1003 of the reducer 100.

[0079] It is to be noted that when the actual radial dimension of the reducer housing 110 is consistent with the radial dimension of the axial magnetic field motor 200, the motor periphery 2003 and the reducer periphery 1003 are flush. However, the actual radial dimension of the reducer housing 110 is smaller than the radial dimension of the axial magnetic field motor 200, and thus the reducer periphery 1003 and the motor periphery 2003 are not flush.

[0080] Further, the reducer housing 110 has an inner connecting surface 1002 and an outer connecting surface 1001, and the axial dimension of the reducer 100 is defined between the inner connecting surface 1002 and the outer connecting surface 1001. The reducer periphery 1003 extends between the inner connecting surface 1002 and the outer connecting surface 1001. The inner connecting surface 1002 is connected to the output surface 2001 of the axial magnetic field motor 200, and the outer connecting surface 1001 is arranged towards the wheel 400.

[0081] The reducer periphery 1003 of the reducer 100 gradually decreases from the inner connecting surface 1002 to the outer connecting surface 1001, so that the reducer 100 is in the shape of a circular truncated cone. The inner connecting surface 1002 is flush with the motor periphery 2003 of the axial magnetic field motor 200, and the outer connecting surface 1001 is located in the area surrounded by the motor periphery 2003.

[0082] Preferably, the air gap surface of the axial magnetic field motor 200 is parallel to the inner connecting surface 1002, so that the axial magnetic field motor 200 is effectively supported on the inner connecting surface 1002 of the reducer 100, and the reducer housing 110 is prevented from being broken.

[0083] In an example, as shown in Figures 3 to 6 The electric drive system further comprises a controller 300, and the step (b) is followed by:

[0084] (c) connecting 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.

[0085] In another example, as shown in Figures 7 to 9 The electric drive system further comprises two controllers 300, and the step (b) is followed by:

[0086] (c) each of the controllers 300 is connected to a motor periphery 2003 of the axial magnetic field motor 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, of course, they can also be arranged staggered.

[0087] 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 integrally arranged, thus omitting the high-voltage wiring harness and low-voltage wiring harness and the like between the axial magnetic field motor 200 and the controller 300, making the structure more compact and simple, while reducing manufacturing costs.

[0088] Of course, the motor periphery 2003 of the axial magnetic field motor 200 is provided with an interface, when the controller 300 is integrally connected to the motor periphery 2003, it is electrically connected to the axial magnetic field motor 200 through the interface thereon, which can also avoid the increase of occupied space due to the exposure of the wiring harness, and avoid the connection process of the wiring harness.

[0089] Reference Figure 6 The controller 300 is in a flat structure, whether it is a single controller 300 or two controllers 300, the overall length is less than the sum of the axial dimensions of the two axial magnetic field motors 200.

[0090] As Figure 1 The two axial magnetic field motors 200 on both sides are correspondingly arranged, which ensures the system stiffness and is beneficial to improve the noise, vibration and harshness (NVH) performance of the whole vehicle.

[0091] As described above, the axial magnetic field motor 200 has the characteristics of small axial dimension, higher power density, lighter mass and larger torque output, etc. It can be seen that after arranging the axial magnetic field motor 200 and the reducer 100 along the wheel pitch direction and integrally connecting them, more space can be released between the two wheels 400 with a certain wheel pitch to increase the design space of the reducer 100, and two axial magnetic field motors 200 and two reducers 100 can be arranged between the two wheels 400. In addition, the reducer 100 is designed with the radial dimension of the axial magnetic field motor 200 as the upper limit and the transmission ratio, and since the radial dimension of the axial magnetic field motor 200 can be much larger than the axial dimension of the axial magnetic field motor 200, the design space utilization rate of the reducer 100 is further increased under the premise of ensuring small overall occupied space, and the reducer 100 with larger transmission ratio can be equipped to make the automobile start faster.

[0092] Second embodiment

[0093] As Figures 1 to 9 shown in the figure, the electric drive system comprises:

[0094] two reducers 100, the reducer 100 being a planetary gear reducer, the reducer 100 being drivingly connected with a wheel 400;

[0095] two axial magnetic field motors 200, one side of the axial magnetic field motor 200 being provided with an output end face 2001, the output end face 2001 of the axial magnetic field motor 200 being connected to the side of the reducer 100 away from the wheel 400;

[0096] wherein the two axial magnetic field motors 200 are connected between the two reducers 100, so that the wheel 400 connected with each reducer 100 is arranged outwardly, and each reducer 100 is drivingly connected with the axial magnetic field motor 200 and the wheel 400 on its two adjacent sides;

[0097] the motor circumference 2003 of the axial magnetic field motor 200 is substantially flush with the reducer circumference 1003 of the reducer 100.

[0098] The electric drive system can be designed by the above-mentioned design method, so as to take advantage of the fact that the axial dimension of the axial magnetic field motor 200 is obviously smaller than the radial dimension, and integrally connect the reducer 100 on the output end face 2001 of the axial side of the axial magnetic field motor 200, so as to release more space between the two wheels 400 with a certain wheel track, and further increase the design space utilization rate of the reducer 100.

[0099] As Figures 3 to 9 shown in the figure, the electric drive system further comprises:

[0100] at least one controller 300, the controller 300 being connected to the motor circumference 2003 of the axial magnetic field motor 200, and the controller 300 and the axial magnetic field motor 200 being electrically connected.

[0101] The number of the controller 300 can be one or two, when the number of the controller 300 is one, the controller 300 is electrically connected with the two axial magnetic field motors 200 respectively. When the number of the controller 300 is two, each controller 300 is electrically connected with one axial magnetic field motor 200 respectively. In addition, the controller 300 can be integrally arranged with the axial magnetic field motor, or the two are integrally connected through fasteners.

[0102] As Figures 3 to 9 shown in the figure, the motor 200 comprises a motor housing 210, the controller 300 comprises a controller housing 310, and the reducer 100 comprises a reducer housing 110;

[0103] 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.

[0104] For example, the motor housing 210 and the reducer housing 110 are integrally connected, and they can be fixed by a plurality of bolts 500, wherein the bolts 500 are arranged 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.

[0105] In addition, the motor housing 210 can be a split structure to adapt to the installation of a double-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 each side housing 212 is installed with a rotor, when the two side housings 212 are fixed by bolts on both sides of the middle housing 211, the two rotors are kept in the air gap on both sides of the stator.

[0106] Continuing to refer to Figures 3 to 9 The periphery of the motor housing 210, the reducer housing 110 and the controller housing 310 can be provided with reinforcing ribs to ensure the structural strength.

[0107] As shown in Figure 5 and Figure 8 The output end face 2001 is recessed to form a containing cavity 20011 inside the axial magnetic field motor 200, and the reducer 100 is partially embedded in the containing cavity 20011 to shorten the overall axial size.

[0108] In addition, the non-output end face 2002 is also recessed to form a second containing cavity 20021 inside the axial magnetic field motor 200, which can accommodate cooling structures and rotary variable structures, etc. The cooling structure can be a cooling pipe for cooling medium (including cooling liquid or cooling gas) to cool the axial magnetic field motor 200. Of course, the containing cavity 20011 of the output end face 2001 can also be arranged with cooling structures, that is, while ensuring that the overall axial size can be accommodated between the two wheels 400, the cooling function can also be increased accordingly.

[0109] Referring to Figure 1 and Figure 6The reducer 100 is fixed, and the axial magnetic field motor 200 is mounted to the side of the reducer 100 away from the wheel 400, i.e. the axial magnetic field motor 200 is supported on the reducer housing 110. Preferably, the axial magnetic field motor 200 further comprises at least a stator and at least a rotor, and an air gap surface is formed between the stator and the rotor, which is parallel to the inner connecting surface 1002, so that the axial magnetic field motor 200 is effectively supported on the inner connecting surface 1002 of the reducer 100. Thus the distance between the gravity center 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 phenomenon that the reducer housing 110 cannot bear the weight of the motor and is broken is avoided. Moreover, in the design process of increasing the air gap surface to increase the torque of the motor, the force arm always remains in a small range, the load on the reducer housing 110 is smaller, and the design space is expanded.

[0110] The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the present application and implement it, and cannot be used to limit the patent application range of the present application, i.e. any equivalent changes or modifications made according to the disclosed spirit of the present application still fall within the patent application range of the present application.

Claims

1. A method of designing an electric drive system, characterized by, The electric drive system comprises at least one axial magnetic field motor (200) and at least one reducer (100), the axial magnetic field motor (200) is provided with an output end face (2001) on one side in the axial direction, and the design method comprises the following steps: (a) according to the radial dimension of the axial magnetic field motor (200) and the required transmission ratio of the electric drive system, the reducer (100) is designed to maximize the transmission ratio under the constraint of the radial dimension of the axial magnetic field motor (200); (b) connecting 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 reducer (100) comprises a reducer housing (110) and a transmission structure (120), and the step (a) comprises: (a1) according to the radial dimension of the axial magnetic field motor (200), the upper limit of the radial dimension of the reducer housing (110) is configured to be not greater than the radial dimension of the axial magnetic field motor (200); (a2) according to the upper limit of the radial dimension of the reducer housing (110) and the transmission ratio, the transmission structure (120) is designed to meet the transmission ratio requirement and have the maximum radial dimension.

2. The design method of an electric drive system according to claim 1, wherein, The transmission structure (120) comprises at least one driving wheel (1211) and at least one driven wheel (1212), the driving wheel (1211) and the driven wheel (1212) are drivingly connected and arranged in the radial direction of the reducer housing (110), and the step (a2) comprises: According to the transmission ratio, the driving wheel (1211) and the driven wheel (1212) meeting the upper limit of the radial dimension of the reducer housing (110) are designed.

3. The design method of an electric drive system according to claim 1, wherein The number of the axial magnetic field motor (200) and the reducer (100) is two respectively, and the step (b) comprises: Connecting two axial magnetic field motors (200) between two reducers (100) so that the wheels (400) connected by each reducer (100) are arranged outwardly, and each reducer (100) is drivingly connected with the axial magnetic field motor (200) and the wheel (400) on its two adjacent sides.

4. The design method of an electric drive system according to claim 1, wherein, The axial magnetic field motor (200) has a motor circumference (2003) defining the radial dimension thereof, the reducer (100) is a planetary gear reducer, the reducer (100) has a reducer circumference (1003) defining the radial dimension thereof, and the step (b) comprises: After 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 circumference (2003) of the axial magnetic field motor (200) is substantially flush with the reducer circumference (1003) of the reducer (100).

5. An electric drive system, characterized by It comprises: Two reducers (100), the reducer (100) is a planetary gear reducer, and the reducer (100) is drivingly connected with a wheel (400); Two axial magnetic field motors (200) are provided with output end faces (2001) on one side in the axial direction, and the output end faces (2001) of the axial magnetic field motors (200) are connected to the sides of the speed reducers (100) away from the wheels (400); The two axial magnetic field motors (200) are connected between the two speed reducers (100) to make the wheels (400) connected by the speed reducers (100) arranged outward, and the speed reducers (100) are drivingly connected with the axial magnetic field motors (200) and the wheels (400) on their two adjacent sides; The radial maximum dimension of the speed reducer (100) is configured to be not more than the radial dimension of the axial magnetic field motor (200), the transmission structure of the speed reducer (100) is designed based on the radial dimension constraint of the axial magnetic field motor (200) and the required transmission ratio of the system, so that the maximum transmission ratio design is realized under the radial dimension constraint of the axial magnetic field motor (200).

6. The electric drive system of claim 5, wherein, Further comprising: At least one controller (300) connected to the motor periphery (2003) of the axial magnetic field motor (200), and the controller (300) and the axial magnetic field motor (200) are electrically connected.

7. The electric drive system of claim 6, wherein, The motor (200) includes a motor housing (210), the controller (300) includes a controller housing (310), and the speed reducer (100) includes a speed reducer housing (110); The motor housing (210) and the controller housing (310) are integrally connected, and / or the motor housing (210) and the speed reducer housing (110) are integrally connected.

8. The electric drive system of claim 5, wherein, The output end face (2001) is recessed inwardly of the axial magnetic field motor (200) to form a receiving cavity (20011), and the speed reducer (100) is partially embedded in the receiving cavity (20011).

9. The electric drive system of claim 5, wherein, The motor (200) further comprises at least one stator and at least one rotor, and an air gap surface is formed between the stator and the rotor, and the air gap surface is parallel to the output end face (2001).

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