Axial flux motor and vehicle

Abstract

The invention discloses an axial magnetic flux motor and a vehicle. The axial magnetic flux motor comprises two rotor assemblies, a stator assembly and a rotating shaft. The rotating shaft penetrates through the stator assembly and is rotationally connected with the stator assembly, the two rotor assemblies are arranged on the two sides, in the axial direction of the rotating shaft, of the stator assembly respectively, one rotor assembly is connected with one end of the rotating shaft, and the other rotor assembly is connected with the other end of the rotating shaft. The sizes of the two rotor assemblies in the radial direction of the rotating shaft are not equal. Therefore, the stator assembly can drive the two rotor assemblies with different sizes to rotate so as to form different output torques, thereby adapting to different load requirements.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to an axial flux motor and a vehicle. Background Art

[0002] The axial flux motor, also known as a "disc motor", is a unique electric motor whose main feature is that the magnetic flux is axially arranged instead of radially arranged as in the conventional case. The magnetic flux of an axial flux motor is oriented along the axial direction of the motor, i.e. in the direction of the shaft. The stator and rotor cores are disc-shaped, with the current-carrying conductors placed radially. This construction makes the motor compact in axial dimensions and has small radial dimensions. The working principle of the axial flux motor is based on the magnetic field generated by the current passing through the stator acting on the permanent magnets on the rotor. When the permanent magnets on the rotor are repelled by the magnetic field, a torque is generated between it and the stator. Due to the greater strength of the permanent magnets, the axial flux motor is able to produce high torque while generating less current.

[0003] The output torque high efficiency range of the axial flux motor in the related art is relatively fixed and cannot flexibly adapt to different load requirements. Summary of the invention

[0004] The present application aims to provide an axial flux motor and a vehicle, which can solve the problem of a fixed output torque high-efficiency range of the axial flux motor in the related art.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application proposes an axial flux motor, comprising: two rotor assemblies, a stator assembly and a rotating shaft; the rotating shaft is inserted into the stator assembly and is rotatably connected to the stator assembly, and the two rotor assemblies are arranged on both sides of the stator assembly along the axial direction of the rotating shaft, one of which is connected to one end of the rotating shaft, and the other is connected to the other end of the rotating shaft; the radial dimensions of the two rotor assemblies along the rotating shaft are not equal.

[0007] Optionally, two stator parts are provided in the stator assembly; each of the stator parts cooperates with one of the rotor assemblies so that the corresponding rotor assembly rotates relative to the stator assembly.

[0008] Optionally, the two stator parts include a first stator part and a second stator part; the second stator part is arranged around the outer circumference of the first stator part; the first stator part cooperates with one of the rotor assemblies, and the second stator part cooperates with the other rotor assembly.

[0009] Optionally, the stator assembly includes a stator bracket; the rotating shaft is passed through the stator bracket and is rotatably connected to the stator bracket, and the first stator part and the second stator part are both embedded in the stator bracket.

[0010] Optionally, the stator support includes a plurality of support sheets; the plurality of support sheets are stacked along the axial direction of the rotating shaft to form the stator support.

[0011] Optionally, the stator part includes a plurality of windings; the plurality of windings are arranged at intervals along the circumferential direction of the stator support.

[0012] Optionally, the two rotor assemblies include a first rotor assembly and a second rotor assembly; the first rotor assembly is connected to one end of the rotating shaft, the second rotor assembly is connected to the other end of the rotating shaft, and the outer diameter of the second rotor assembly is larger than the outer diameter of the first rotor assembly; the first stator part cooperates with the first rotor assembly to enable the first rotor assembly to rotate relative to the first stator part; the second stator part cooperates with the second rotor assembly to enable the second rotor assembly to rotate relative to the second stator part.

[0013] Optionally, the rotor assembly includes a turntable and a magnet, wherein the magnet is arranged on a side of the turntable edge close to the stator part; and a diameter of the turntable in the first rotor assembly is smaller than a diameter of the turntable in the second rotor assembly.

[0014] Optionally, the diameter of the turntable in the first rotor assembly is a, and the diameter of the turntable in the second rotor assembly is b, satisfying: 1.5≤b / a≤2.5.

[0015] Optionally, a first gap exists between the first rotor assembly and the stator assembly, and a second gap exists between the second rotor assembly and the stator assembly.

[0016] Optionally, along the axial direction of the rotating shaft, a size of the first gap is smaller than a size of the second gap.

[0017] Optionally, a plurality of weight-reducing holes are provided on the turntable, and the plurality of weight-reducing holes are arranged at intervals along the circumference of the turntable.

[0018] Optionally, along the axial direction of the rotating shaft, the magnetic poles of two adjacent magnets in the same rotor assembly close to one end of the stator assembly are different.

[0019] Optionally, among the two rotor assemblies, the magnet of one rotor assembly is arranged opposite to the magnet of the other rotor assembly along the axial direction of the rotating shaft, and the magnetic poles of the magnet of one rotor assembly and the magnet of the other rotor assembly near one end are different.

[0020] Optionally, a bearing is further included; the bearing is arranged between the rotating shaft and the stator assembly, and the stator assembly is rotatably connected to the rotating shaft through the bearing.

[0021] Optionally, the number of the bearings is two; the two bearings are spaced apart along the axial direction of the rotating shaft; and / or the bearings are angular contact ball bearings.

[0022] Optionally, it also includes a connecting disk; the connecting disk is sleeved on the rotating shaft, the connecting disk is connected to the rotating shaft through a spline, and the connecting disk is fixedly connected to one of the rotor assemblies.

[0023] In a second aspect, an embodiment of the present application proposes a vehicle, comprising the axial flux motor described in the above embodiment.

[0024] In the embodiment of the present application, the rotating shaft is inserted into the stator assembly and is rotatably connected to the stator assembly, and two rotor assemblies are arranged on both sides of the stator assembly along the axial direction of the rotating shaft, one of which is connected to one end of the rotating shaft, and the other is connected to the other end of the rotating shaft; the two rotor assemblies have unequal radial sizes along the rotating shaft. In this way, the stator assembly can drive the two rotor assemblies of different sizes to rotate to form different output torques, thereby adapting to different load requirements.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic diagram of an axial flux motor according to an embodiment of the present application;

[0028] Figure 2 is an exploded view of an axial flux motor according to an embodiment of the present application;

[0029] Figure 3 is a cross-sectional view of an axial flux motor according to an embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the principle of an axial flux motor according to an embodiment of the present application.

[0031] Reference numerals:

[0032] 1-rotating shaft; 2-stator assembly; 21-first stator part; 22-second stator part; 23-stator bracket; 231-bracket plate; 24-first winding; 241-first coil; 242-first stator core; 25-second winding; 251-second coil; 252-second stator core; 3-rotor assembly; 31-first rotor assembly; 311-first turntable; 312-first magnet; 32-second rotor assembly; 321-second turntable; 322-second magnet; 4-first gap; 5-second gap; 6-weight reduction hole; 7-bearing; 8-connecting plate; 9-end cover; 10-retaining ring; 11-fastener; 12-sleeve. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0034] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] The axial flux motor and vehicle provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0038] like Figure 1 As shown, according to some embodiments of the present application, the axial flux motor includes: two rotor assemblies 3, a stator assembly 2 and a rotating shaft 1; the rotating shaft 1 is inserted into the stator assembly 2 and is rotatably connected to the stator assembly 2, and the two rotor assemblies 3 are arranged on both sides of the stator assembly 2 along the axial direction of the rotating shaft 1, one of which is connected to one end of the rotating shaft 1, and the other is connected to the other end of the rotating shaft 1; the radial dimensions of the two rotor assemblies 3 along the rotating shaft 1 are not equal.

[0039] In the embodiment of the present application, the rotating shaft 1 is inserted into the stator assembly 2 and is rotatably connected to the stator assembly 2, and two rotor assemblies 3 are disposed on both sides of the stator assembly 2 along the axial direction of the rotating shaft 1, one of which is connected to one end of the rotating shaft 1, and the other is connected to the other end of the rotating shaft 1; the two rotor assemblies 3 have unequal sizes along the radial direction of the rotating shaft 1. In this way, the stator assembly 2 can drive the two rotor assemblies 3 of different sizes to rotate, so as to form different output torques, thereby adapting to different load requirements.

[0040] It should be noted that the unequal sizes of the two rotor assemblies 3 along the radial direction of the rotating shaft 1 means that the outer diameter of one rotor assembly 3 is unequal to the outer diameter of the other rotor assembly 3 .

[0041] Alternatively, if Figure 1 As shown, two stator parts are provided in the stator assembly 2 ; each stator part cooperates with one of the rotor assemblies 3 so that the corresponding rotor assembly 3 rotates relative to the stator assembly 2 .

[0042] In the embodiment of the present application, each stator part cooperates with one of the rotor assemblies 3 to make the corresponding rotor assembly 3 rotate relative to the stator assembly 2. In this way, different rotor assemblies 3 can be controlled to rotate by different stator parts, so that different stator parts can control the rotor assembly 3 individually or together, which is more flexible and convenient.

[0043] Alternatively, if Figure 1As shown, the two stator parts include a first stator part 21 and a second stator part 22 ; the second stator part 22 is arranged around the outer circumference of the first stator part 21 ; the first stator part 21 cooperates with one of the rotor assemblies 3 , and the second stator part 22 cooperates with the other rotor assembly 3 .

[0044] In the embodiment of the present application, the second stator part 22 is arranged around the outer circumference of the first stator part 21; the first stator part 21 cooperates with one of the rotor assemblies 3, and the second stator part 22 cooperates with the other rotor assembly 3. In this way, the second stator part 22 cooperates with the larger rotor assembly 3, and the first stator part 21 cooperates with the smaller rotor assembly 3, thereby achieving stable and efficient driving.

[0045] Alternatively, if Figure 1 As shown, the stator assembly 2 includes a stator bracket 23 ; the rotating shaft 1 is passed through the stator bracket 23 and is rotatably connected to the stator bracket 23 ; the first stator part 21 and the second stator part 22 are both embedded in the stator bracket 23 .

[0046] In the embodiment of the present application, the shaft is inserted into the stator bracket 23 and is rotatably connected to the stator bracket 23, so that the first stator part 21 and the second stator part 22 are both embedded in the stator bracket 23. In this way, the first stator part 21 and the second stator part 22 are fixed by the stator bracket 23, so that the first stator part 21 drives the first rotor assembly 31 to rotate relative to the stator bracket 23, and the second stator part 22 drives the second rotor assembly 32 to rotate relative to the stator bracket 23.

[0047] Alternatively, if Figure 3 As shown, the stator support 23 includes a plurality of support sheets 231 ; the plurality of support sheets 231 are stacked along the axial direction of the rotating shaft 1 to form the stator support 23 .

[0048] In the embodiment of the present application, a plurality of bracket sheets 231 are stacked and arranged along the axial direction of the rotating shaft 1 to form the stator bracket 23. In this way, the heat generated by the stator part can be dissipated, thereby improving the heat dissipation efficiency.

[0049] In some embodiments, the stator bracket 23 can be formed by laminating aluminum alloy sheets, and the bolt holes provided on the circumferential portion of the bracket sheet 231 can fix it to the housing of the axial flux motor. When the axial flux motor is working, the gaps between the bracket sheets 231 can dissipate the heat generated by the windings being energized, thereby improving the heat dissipation efficiency. Therefore, the laminated stator bracket 23 is more conducive to the circulation of the winding heat than the one-piece molding.

[0050] Alternatively, if Figure 2 and Figure 3 As shown, the stator portion includes a plurality of windings; the plurality of windings are arranged at intervals along the circumference of the stator support 23 .

[0051] In the embodiment of the present application, a plurality of windings are arranged at intervals along the circumferential direction of the stator support 23. In this way, each winding can drive the corresponding rotor assembly 3 to rotate, thereby improving the output torque of the rotor assembly 3.

[0052] In some embodiments, Figure 2 As shown, the first stator part 21 includes a plurality of first windings 24 which are arranged at intervals in the axial direction around the stator support 23 ; the second stator part 22 includes a plurality of second windings 25 which are arranged at intervals around the outer circumference of the first windings 24 .

[0053] In some embodiments, Figure 2 As shown, the first winding 24 includes a first coil 241 and a first stator core 242, and the first coil 241 is circumferentially arranged around the first stator core 242; the present application can control the magnetic field generated by the first winding 24 by controlling the magnitude of the current in the first coil 241, thereby controlling the output torque of the first rotor assembly 31.

[0054] In some embodiments, Figure 2 As shown, the second winding 25 includes a second coil 251 and a second stator core 252, and the second coil 251 is circumferentially arranged around the second stator core 252; the present application can control the magnetic field generated by the second winding 25 by controlling the magnitude of the current in the second coil 251, thereby controlling the output torque of the second rotor assembly 32.

[0055] In some embodiments, the first coil 241 is arranged circumferentially around the first stator core 242 and the second coil 251 is arranged circumferentially around the second stator core 252 to facilitate the winding of the first coil 241 and the second coil 251; in addition, this winding method can reduce the length of the winding end, save materials, and reduce cost and weight.

[0056] In some embodiments, the above-mentioned stator core is composed of laminated silicon steel sheets insulated from each other. In this way, eddy current losses can be reduced and the processing and manufacturing efficiency of the stator core can be improved. An insulating layer or insulating paper is provided on the surface of the stator core, so that the coil and the stator core are prevented from directly contacting and causing a short circuit. Compared with the traditional single structure, the spliced ​​winding has a shorter stator core and a relatively shorter magnetic path length. Therefore, the magnetic resistance of the stator core is significantly reduced, and the energy consumption and induced electromotive force harmonics are correspondingly reduced.

[0057] Alternatively, if Figures 1 to 4As shown, the two rotor assemblies 3 include a first rotor assembly 31 and a second rotor assembly 32; the first rotor assembly 31 is connected to one end of the rotating shaft 1, and the second rotor assembly 32 is connected to the other end of the rotating shaft 1, and the outer diameter of the second rotor assembly 32 is greater than the outer diameter of the first rotor assembly 31; the first stator part 21 cooperates with the first rotor assembly 31 to enable the first rotor assembly 31 to rotate relative to the first stator part 21; the second stator part 22 cooperates with the second rotor assembly 32 to enable the second rotor assembly 32 to rotate relative to the second stator part 22.

[0058] In the embodiment of the present application, the first rotor assembly 31 is connected to one end of the rotating shaft 1, and the second rotor assembly 32 is connected to the other end of the rotating shaft 1, and the outer diameter of the second rotor assembly 32 is larger than the outer diameter of the first rotor assembly 31; the first stator part 21 cooperates with the first rotor assembly 31 to make the first rotor assembly 31 rotate relative to the first stator part 21; the second stator part 22 cooperates with the second rotor assembly 32 to make the second rotor assembly 32 rotate relative to the second stator part 22. In this way, by setting the outer diameter of the second rotor assembly 32 to be larger than the outer diameter of the first rotor assembly 31, the output torque of the second rotor assembly 32 is larger than the output torque of the first rotor assembly 31, so that the rotor assembly 3 has different output torques, thereby adapting to different load requirements.

[0059] It should be noted that the outer diameter of the second rotor assembly 32 is greater than the outer diameter of the first rotor assembly 31, which means that the diameter of the projection of the second rotor assembly 32 in the axial plane perpendicular to the shaft 1 is greater than the diameter of the projection of the first rotor assembly 31 in the axial plane perpendicular to the shaft 1.

[0060] In some embodiments, a controller is also included; the first stator part 21 and the second stator part 22 are electrically connected to the controller respectively, and the controller can control the current in the first stator part 21 and the second stator part 22, thereby controlling the output torque of the first rotor assembly 31 and the second rotor assembly 32.

[0061] In addition, the output torque of the axial flux motor is proportional to the cube of the radius of the rotor assembly 3, so under the same conditions, the larger the outer diameter of the rotor assembly 3, the greater the output torque. When the first stator part 21 is energized, the first rotor assembly 31 is driven to rotate and output a small torque; when the second stator part 22 is energized, the second rotor assembly 32 is driven to rotate and output a medium torque; when the first stator part 21 and the second stator part 22 are energized at the same time, the first rotor assembly 31 and the second rotor assembly 32 are driven to rotate at the same time and output a large torque. Therefore, the first rotor assembly 31 outputs a small torque to match the light load condition; the second rotor assembly 32 outputs a medium torque to match the medium load condition; the first rotor assembly 31 and the second rotor assembly 32 jointly output a large torque to match the heavy load condition.

[0062] Alternatively, if Figure 3 As shown, the rotor assembly 3 includes a turntable and a magnet, wherein the magnet is arranged on one side of the turntable edge close to the stator portion; the diameter of the turntable in the first rotor assembly 31 is smaller than the diameter of the turntable in the second rotor assembly 32 .

[0063] In the embodiment of the present application, the magnet is arranged on the side of the edge of the turntable close to the stator part; the diameter of the turntable in the first rotor assembly 31 is smaller than the diameter of the turntable in the second rotor assembly 32. In this way, the winding in the stator assembly 2 can interact with the magnet, thereby driving the turntable to rotate relative to the stator bracket 23.

[0064] In some embodiments, Figures 1 to 3 As shown, the first rotor assembly 31 includes a first rotating disk 311 and a plurality of first magnets 312, the plurality of first magnets 312 are arranged on a side of the first rotating disk 311 close to the stator bracket 23, and the plurality of first magnets 312 are arranged at intervals along the circumference of the first rotating disk 311. The second rotor assembly 32 includes a second rotating disk 321 and a plurality of second magnets 322, the plurality of second magnets 322 are arranged on a side of the second rotating disk 321 close to the stator bracket 23, and the plurality of second magnets 322 are arranged at intervals along the circumference of the second rotating disk 321.

[0065] In some embodiments, the diameter of the second rotating disk 321 is the same as the circumferential distribution radius of the second winding 25, and the diameter of the first rotating disk 311 is the same as the circumferential distribution radius of the first winding 24. In this way, on the side of the stator bracket 23 close to the first rotating disk 311, the first rotating disk 311 cannot cover the surface of the second winding 25, so that the second winding 25 is exposed to the air on this side of the first rotating disk 311, thereby reducing the heat accumulation between the first rotating disk 311 and the stator bracket 23, and improving the heat dissipation efficiency to a certain extent.

[0066] Alternatively, if Figure 2 As shown, the diameter of the rotating disk in the first rotor assembly 31 is a, and the diameter of the rotating disk in the second rotor assembly 32 is b, satisfying: 1.5≤b / a≤2.5.

[0067] In the embodiment of the present application, the diameter of the rotating disk in the first rotor assembly 31 is set to a, and the diameter of the rotating disk in the second rotor assembly 32 is set to b, so as to satisfy: 1.5≤b / a≤2.5. In this way, the ratio of the diameter of the second rotating disk 321 to the diameter of the first rotating disk 311 is within a certain range, so as to avoid the problem of poor medium torque coverage caused by too large a ratio; in addition, the problem of too small a ratio causing a small torque difference between the first rotating disk 311 and the second rotating disk 321, which leads to a small torque coverage range, can also be avoided.

[0068] Exemplarily, the ratio of the diameter of the second rotating disk 321 to the diameter of the first rotating disk 311 can be any value such as 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, or a range between any two values.

[0069] Alternatively, if Figure 3 As shown, there is a first gap 4 between the first rotor assembly 31 and the stator assembly 2 , and there is a second gap 5 between the second rotor assembly 32 and the stator assembly 2 .

[0070] In the embodiment of the present application, a first gap 4 is provided between the first rotor assembly 31 and the stator assembly 2, and a second gap 5 is provided between the second rotor assembly 32 and the stator assembly 2. In this way, a rotation space is provided between the first rotor assembly 31 and the first stator portion 21 in the stator assembly 2, and a rotation space is provided between the second rotor assembly 32 and the second stator portion 22 in the stator assembly 2.

[0071] Alternatively, if Figure 3 As shown, along the axial direction of the rotating shaft 1 , the size of the first gap 4 is smaller than the size of the second gap 5 .

[0072] In the embodiment of the present application, the size of the first gap 4 is smaller than the size of the second gap 5 along the axial direction of the rotating shaft 1, so as to provide a larger deformation space for the second rotor assembly 32 when rotating.

[0073] Specifically, when the first rotor assembly 31 and the second rotor assembly 32 are working, both the first rotor assembly 31 and the second rotor assembly 32 are affected by the axial magnetic force; when the first winding 24 is energized and the second winding 25 is not energized, both the first rotor assembly 31 and the second rotor assembly 32 are affected by the circumferential magnetic force, but the axial magnetic force exerted on the first rotor assembly 31 is greater than the axial magnetic force exerted on the second rotor assembly 32. Since the axial magnetic force exerted on the first rotor assembly 31 is not large and the outer diameter of the first rotor assembly 31 is small, its axial deflection deformation is small, so a smaller first gap 4 can be set.

[0074] Furthermore, when the first winding 24 and the second winding 25 are energized at the same time, since the outer diameter of the second rotor assembly 32 is larger than the outer diameter of the first rotor assembly 31, the axial deflection deformation of the second rotor assembly 32 is larger due to the larger axial magnetic force on the second rotor assembly 32, and thus a larger second gap 5 is required.

[0075] Alternatively, if Figure 2 As shown, a plurality of weight-reducing holes 6 are provided on the turntable, and the plurality of weight-reducing holes 6 are arranged at intervals along the circumference of the turntable.

[0076] In the embodiment of the present application, a plurality of weight-reducing holes 6 are provided on the turntable, and the plurality of weight-reducing holes 6 are provided at intervals along the circumference of the turntable. In this way, the weight of the turntable can be reduced through the weight-reducing holes 6. In addition, the heat generated by the rotor assembly 3 can flow out through the weight-reducing holes 6, so as to improve the heat dissipation efficiency.

[0077] In some embodiments, a plurality of weight-reducing holes 6 are provided on the first turntable 311 and the second turntable 321 . The number and spacing of the weight-reducing holes 6 can be set according to actual needs, and the embodiments of the present application are not limited thereto.

[0078] Optionally, along the axial direction of the rotating shaft 1 , the magnetic poles of two adjacent magnets in the same rotor assembly 3 close to one end of the stator assembly 2 are different.

[0079] In the embodiment of the present application, the magnetic poles of two adjacent magnets in the same rotor assembly 3 close to one end of the stator assembly 2 are different, so as to match the corresponding stator assembly 2 to the greatest extent, thereby improving the output torque of the rotor assembly 3.

[0080] Exemplarily, the N pole of one of the first magnets 312 in the first rotor assembly 31 faces the first winding 24, and the S poles of the other two first magnets 312 adjacent to the first magnet 312 face the first winding 24. The magnetic poles of the second magnet 322 in the second rotor assembly 32 are similar to those of the magnets in the first rotor assembly 31, and are not described in detail in this embodiment.

[0081] Optionally, among the two rotor assemblies 3, the magnets of one rotor assembly 3 are arranged opposite to the magnets of the other rotor assembly 3 along the axial direction of the rotating shaft 1, and the magnetic poles of the magnets of one rotor assembly 3 and the magnets of the other rotor assembly 3 near one end are different.

[0082] In the embodiment of the present application, in the two rotor assemblies 3, the magnets of one rotor assembly 3 and the magnets of the other rotor assembly 3 are arranged opposite to each other along the axial direction of the rotating shaft 1, and the magnetic poles of the magnets of one rotor assembly 3 and the magnets of the other rotor assembly 3 are different from each other at one end. In this way, when the first winding 24 is energized, it can not only drive the first rotor assembly 31 to rotate, but also drive the second rotor assembly 32 to rotate, thereby increasing the output torque to a certain extent and improving the energy utilization efficiency; in addition, when the second winding 25 is energized, it can not only drive the second rotor assembly 32 to rotate, but also drive the first rotor assembly 31 to rotate, thereby increasing the output torque to a certain extent and improving the energy utilization efficiency.

[0083] Exemplarily, the N pole of the first magnet 312 in the first rotor assembly 31 faces the first winding 24, and the S pole of the second magnet 322 arranged opposite to the first magnet 312 faces the second winding 25; or, the S pole of the first magnet 312 in the first rotor assembly 31 faces the first winding 24, and the N pole of the second magnet 322 arranged opposite to the first magnet 312 faces the second winding 25.

[0084] Alternatively, if Figures 2 to 4 As shown, it also includes a bearing 7; the bearing 7 is arranged between the rotating shaft 1 and the stator assembly 2, and the stator assembly 2 is rotatably connected to the rotating shaft 1 through the bearing 7.

[0085] In the embodiment of the present application, the bearing 7 is disposed between the rotating shaft 1 and the stator assembly 2, and the stator assembly 2 is rotatably connected to the rotating shaft 1 through the bearing 7. In this way, the friction between the rotating shaft 1 and the stator assembly 2 is reduced, thereby reducing the energy loss of the rotating shaft 1.

[0086] Alternatively, if Figures 2 to 4 As shown, there are two bearings 7 ; the two bearings 7 are spaced apart along the axial direction of the rotating shaft 1 .

[0087] In the embodiment of the present application, two bearings 7 are provided; the two bearings 7 are spaced apart along the axial direction of the rotating shaft 1. In this way, the connection stability between the rotating shaft 1 and the stator assembly 2 is increased. In addition, the bearing 7 is integrated into the stator assembly 2, which is conducive to reducing the volume of the axial flux motor and making the structure more compact.

[0088] In some embodiments, a sleeve 12 is further included; the sleeve 12 is sleeved in the stator bracket 23 and fixedly connected to the stator bracket 23; the rotating shaft 1 is passed through the sleeve 12, and two bearings 7 are arranged between the sleeve 12 and the rotating shaft 1.

[0089] Optionally, the bearing 7 is a high-precision angular contact ball bearing 7 .

[0090] In the embodiment of the present application, the bearing 7 is set as a high-precision angular contact ball bearing 7. In this way, it is possible to bear radial load and axial load at the same time, thereby better supporting the motor shaft with a high rotation speed.

[0091] In some embodiments, Figure 3 and Figure 4 As shown, two angular contact ball bearings 7 are arranged back to back, that is, the wide end faces of the two bearings 7 are arranged opposite to each other. In this way, the contact angle line of the bearing 7 is spread along the direction of the rotary axis 1, which can increase the radial and axial support angle rigidity and anti-deformation ability.

[0092] In some embodiments, the angular contact ball bearing 7 is installed back to back between the rotating shaft 1 and the sleeve 12, and the bearing 7 bears the axial interaction force of the rotor assembly 3 and the stator assembly 2; when the first winding 24 is energized, since the magnitude of the magnetic force is negatively correlated with the distance, the axial magnetic force F1 of the first rotor assembly 31 is greater than the axial magnetic force F2 of the second rotor assembly 32, and the bearing 7 bears the axial force F=F1-F2; when the second winding 25 is energized, the axial magnetic force F1' of the first rotor assembly 31 is less than the axial magnetic force F2' of the second rotor assembly 32, and the bearing 7 bears the axial force F=F2'-F1'; when the first winding 24 and the second winding 25 are energized at the same time, the axial magnetic force F1" of the first rotor assembly 31 is less than the axial magnetic force F2" of the second rotor assembly 32, and the bearing 7 bears the axial force F=F2"-F1".

[0093] The single disc axial flux motor in the related art includes a stator and a rotor, and the axial magnetic force on the internal bearing of the motor is the interaction force F3 between the stator and the rotor, and F3 is a unidirectional unoffset force. Therefore, compared with the axial flux motor with one rotor, the rotor components 3 on both sides of the axial flux motor of the present application generate axial magnetic forces of different magnitudes and opposite directions due to the magnetic field of the stator component 2, so the axial magnetic force can be partially offset, reducing the load on the bearing 7 and helping to improve the life of the motor.

[0094] Optionally, a connecting disk 8 is further included; the connecting disk 8 is sleeved on the rotating shaft 1 , the connecting disk 8 is connected to the rotating shaft 1 via a spline, and the connecting disk 8 is fixedly connected to one of the rotor assemblies 3 .

[0095] In the embodiment of the present application, the connection disk 8 is sleeved on the rotating shaft 1, the connection disk 8 is connected to the rotating shaft 1 through a spline, and the connection disk 8 is fixedly connected to one of the rotor assemblies 3. In this way, the rotor assembly 3 is connected to the rotating shaft 1 through the connection disk 8, so that the rotation of the rotor assembly 3 relative to the stator bracket 23 is realized.

[0096] In some embodiments, Figure 3 As shown, it also includes a retaining ring 10; the retaining ring 10 is sleeved on the rotating shaft 1, and the connecting plate 8 is arranged between the retaining ring 10 and the bearing 7; the retaining ring 10 and the bearing 7 are respectively in contact with the connecting plate 8, thereby limiting the axial displacement of the connecting plate 8 on the rotating shaft 1.

[0097] In some embodiments, Figure 3 As shown, it also includes an end cover 9 and multiple fasteners 11. The end cover 9 is sleeved on one end of the rotating shaft 1. The fastener 11 passes through the end cover 9 and is fixedly connected to the rotating shaft 1. The fastener 11 passes through the end cover 9 and is connected to the second rotating disk 321, thereby realizing the connection between the rotating shaft 1 and the second rotating disk 321.

[0098] In a second aspect, an embodiment of the present application proposes a vehicle, comprising the axial flux motor in the above embodiment.

[0099] In the embodiment of the present application, the rotating shaft 1 is inserted into the stator assembly 2 and is rotatably connected to the stator assembly 2, and two rotor assemblies 3 are disposed on both sides of the stator assembly 2 along the axial direction of the rotating shaft 1, one of which is connected to one end of the rotating shaft 1, and the other is connected to the other end of the rotating shaft 1; the two rotor assemblies 3 have unequal sizes along the radial direction of the rotating shaft 1. In this way, the stator assembly 2 can drive the two rotor assemblies 3 of different sizes to rotate, so as to form different output torques, thereby adapting to different load requirements.

[0100] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0101] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An axial flux motor, characterized in that: include: Two rotor assemblies (3), a stator assembly (2) and a rotating shaft (1); The rotating shaft (1) is inserted into the stator assembly (2) and is rotatably connected to the stator assembly (2); the two rotor assemblies (3) are arranged on both sides of the stator assembly (2) along the axial direction of the rotating shaft (1), one of which is connected to one end of the rotating shaft (1) and the other is connected to the other end of the rotating shaft (1); the radial dimensions of the two rotor assemblies (3) along the rotating shaft (1) are unequal.

2. The axial flux motor according to claim 1, characterized in that: The stator assembly (2) is provided with two stator parts; each of the stator parts cooperates with one of the rotor assemblies (3) so that the corresponding rotor assembly (3) rotates relative to the stator assembly (2).

3. The axial flux motor according to claim 2, characterized in that: The two stator parts include a first stator part (21) and a second stator part (22); the second stator part (22) is arranged around the outer circumference of the first stator part (21); the first stator part (21) cooperates with one of the rotor assemblies (3), and the second stator part (22) cooperates with the other rotor assembly (3).

4. The axial flux motor according to claim 3, characterized in that: The stator assembly (2) comprises a stator bracket (23); The rotating shaft (1) is inserted into the stator bracket (23) and is rotatably connected to the stator bracket (23); the first stator part (21) and the second stator part (22) are both embedded in the stator bracket (23).

5. The axial flux motor according to claim 4, characterized in that: The stator support (23) comprises a plurality of support sheets (231); the plurality of support sheets (231) are stacked and arranged along the axial direction of the rotating shaft (1) to form the stator support (23).

6. The axial flux motor according to claim 4, characterized in that: The stator part comprises a plurality of windings; the plurality of windings are arranged at intervals along the circumferential direction of the stator support (23).

7. The axial flux motor according to claim 3, characterized in that: The two rotor assemblies (3) include a first rotor assembly (31) and a second rotor assembly (32); The first rotor assembly (31) is connected to one end of the rotating shaft (1), the second rotor assembly (32) is connected to the other end of the rotating shaft (1), and the outer diameter of the second rotor assembly (32) is greater than the outer diameter of the first rotor assembly (31); The first stator part (21) cooperates with the first rotor assembly (31) so that the first rotor assembly (31) rotates relative to the first stator part (21); and the second stator part (22) cooperates with the second rotor assembly (32) so that the second rotor assembly (32) rotates relative to the second stator part (22).

8. The axial flux motor according to claim 7, characterized in that: The rotor assembly (3) comprises a turntable and a magnet, wherein the magnet is arranged on a side of the edge of the turntable close to the stator part; the diameter of the turntable in the first rotor assembly (31) is smaller than the diameter of the turntable in the second rotor assembly (32).

9. The axial flux motor according to claim 8, characterized in that: The diameter of the rotating disk in the first rotor assembly (31) is a, and the diameter of the rotating disk in the second rotor assembly (32) is b, satisfying: 1.5≤b / a≤2.

5.

10. The axial flux motor according to claim 7, characterized in that: A first gap (4) exists between the first rotor assembly (31) and the stator assembly (2), and a second gap (5) exists between the second rotor assembly (32) and the stator assembly (2).

11. The axial flux motor according to claim 10, characterized in that: Along the axial direction of the rotating shaft (1), the size of the first gap (4) is smaller than the size of the second gap (5).

12. The axial flux motor according to claim 8, characterized in that: The turntable is provided with a plurality of weight-reducing holes (6), and the plurality of weight-reducing holes (6) are arranged at intervals along the circumference of the turntable.

13. The axial flux motor according to claim 8, characterized in that: Along the axial direction of the rotating shaft (1), the magnetic poles of two adjacent magnets in the same rotor assembly (3) close to one end of the stator assembly (2) are different.

14. The axial flux motor according to claim 13, characterized in that: In the two rotor assemblies (3), the magnet of one of the rotor assemblies (3) is arranged opposite to the magnet of the other rotor assembly (3) along the axial direction of the rotating shaft (1), and the magnetic poles of the magnet of one of the rotor assemblies (3) and the magnet of the other rotor assembly (3) are different at one end thereof.

15. The axial flux motor according to claim 1, characterized in that: Also includes a bearing (7); The bearing (7) is arranged between the rotating shaft (1) and the stator assembly (2), and the stator assembly (2) is rotatably connected to the rotating shaft (1) via the bearing (7).

16. The axial flux motor according to claim 15, characterized in that: The number of the bearings (7) is two; the two bearings (7) are spaced apart along the axial direction of the rotating shaft (1); and / or the bearings (7) are angular contact ball bearings (7).

17. The axial flux motor according to any one of claims 1 to 16, characterized in that: Also includes a connecting plate (8); The connecting disk (8) is sleeved on the rotating shaft (1), the connecting disk (8) is connected to the rotating shaft (1) via a spline, and the connecting disk (8) is fixedly connected to one of the rotor assemblies (3).

18. A vehicle, characterized in that: include: An axial flux motor as claimed in any one of claims 1 to 17.

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