Disc motor, assembly method thereof, powertrain and vehicle

Abstract

The present application provides a disc motor, an assembly method thereof, a powertrain, and a vehicle. The disc motor includes a rotating shaft and a first rotor, a stator, and a second rotor sleeved on the rotating shaft. The first rotor, stator, and second rotor are arranged in sequence and at intervals. The stator is rotatably connected to the rotating shaft. The rotating shaft includes a first shaft body and a second shaft body that are detachably connected. The first shaft body is fixedly connected to the first rotor, and the second shaft body is fixedly connected to the second rotor. Before assembly, the first rotor and the first shaft body are dynamically balanced, and the second rotor and the second shaft body are dynamically balanced. Afterwards, the first shaft body and the second shaft body are connected, and the stator is installed to improve the accuracy of the dynamic balancing adjustment and enhance the convenience of assembly.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a disc motor and an assembly method thereof, a powertrain, and a vehicle. Background Art

[0002] One of the development directions for electric vehicle drive motors is multi-motorization, with the ultimate goal of achieving independent drive for each wheel to achieve optimal power and handling. To this end, miniaturization of motors has become an industry trend. Within a certain power requirement, there are two approaches to miniaturizing motors: high speed and high torque density. Current motor designs are approaching the limits of mechanical systems (primarily the gear shaft) (e.g., 20,000 rpm), but there is still considerable room for high-torque density designs. Axial flux motors, also known as disc motors, form a closed magnetic flux circuit through the motor's axial air gap and offer high torque density. Existing disc motors typically include three structures: single-stator-single-rotor, dual-stator-single-rotor, and dual-rotor-single-stator. The dual-rotor-single-stator design offers the highest torque density of the three, making dual-rotor-single-stator motors a growing research hotspot.

[0003] However, existing electronic devices with dual rotors and a single stator require dynamic balancing of the rotor system (rotor + shaft) before assembly. Currently, one method involves using a dummy shaft to dynamically balance the rotor before assembling the stator, rotor, and shaft. However, due to the deviation between the dummy shaft assembly and the actual shaft assembly, the deviation between the center of mass and the center of rotation of the entire rotor system is limited by the inherent deviation of current process capabilities (approximately 6-9 μm). According to the national standard GB9239.1-2006 for motor dynamic balancing, motors with a maximum speed of 950 rpm or above must meet the G2.5 dynamic balancing requirement. For example, at 10,000 rpm, the center of mass deviation is limited to approximately 2.5 μm. Considering this inherent deviation, the dummy shaft dynamic balancing solution theoretically cannot achieve the G2.5 level of dynamic balancing. Another dynamic balancing method involves first balancing the two rotors, then removing one of the rotors, installing the stator, and then installing the rotor. This method involves numerous assembly steps, which is not conducive to improving production efficiency. Furthermore, repeated disassembly and assembly of interference-fitting components can easily reduce the reliability of the entire machine. Therefore, the existing dynamic balancing adjustment method cannot take into account both accurate dynamic balancing adjustment and convenient production. Summary of the Invention

[0004] The present application provides a disc motor and an assembly method thereof, a powertrain, and a vehicle to improve the accuracy of dynamic balancing adjustment and enhance the convenience of assembly.

[0005] In a first aspect, the present application provides a disc motor, which includes a rotating shaft and a first rotor, a stator, and a second rotor sleeved on the rotating shaft. The first rotor, the stator, and the second rotor are arranged in sequence and at intervals. The stator is rotatably connected to the rotating shaft, wherein the rotating shaft includes a first shaft body and a second shaft body that are detachably connected. The first shaft body is fixedly connected to the first rotor, and the second shaft body is fixedly connected to the second rotor.

[0006] The disc motor of the present application has a rotating shaft that can be divided into a first shaft body and a second shaft body, wherein the first shaft body is connected to the first rotor, and the second shaft body is connected to the second rotor. Before assembly, the first rotor and the first shaft body are dynamically balanced, and the second rotor and the second shaft body are dynamically balanced. Then, the first shaft body and the second shaft body are connected, and the stator is installed. During the dynamic balancing adjustment process, both the first rotor and the second rotor are adjusted using real shafts, thereby avoiding the problem of poor accuracy caused by using false shafts. During the dynamic balancing adjustment process, the dynamic balance index of the single rotor system (such as the rotor system composed of the first rotor and the first shaft body or the rotor system composed of the second rotor and the second shaft body) can be controlled within the dynamic balance index of the entire disc motor (i.e., the single disc dynamic balance requirements are tightened) so that the dynamic balance index of the final disc motor meets the requirements. With a disc motor using this structure, when assembling, there is no need to disassemble and assemble the rotor after dynamic balancing adjustment. The entire motor is assembled at one time, which can ensure the convenience and reliability of assembly.

[0007] In an optional implementation, the connection method between the first shaft and the second shaft includes but is not limited to an interference fit connection, a keyed connection, a coupling connection, a pin connection, a flange connection, etc. The specific connection method between the first shaft and the second shaft is not limited in this application, as long as the connection between the two can be achieved.

[0008] In an optional implementation, a weighted assembly is provided on at least one of a surface of the first rotor perpendicular to the rotation axis and away from the stator, and a surface of the second rotor perpendicular to the rotation axis and away from the stator. In an optional implementation, a weighted assembly can be provided on at least one of the circumferential surfaces of the first rotor and the second rotor.

[0009] In an optional implementation, the weight adjustment assembly includes a fixing element provided on the first rotor and the second rotor and a weight adjustment block connected to the fixing element. As an example, the fixing element includes an opening or a protruding column.

[0010] In one optional implementation, a fixed element is provided on a side surface of the first rotor perpendicular to the rotation axis and away from the stator. Multiple fixed elements are provided, forming concentric rings along the radial direction of the first rotor. For example, within any ring formed by the fixed elements, the multiple fixed elements are evenly arranged along the circumference of the first rotor. A fixed element is provided on a side surface of the second rotor perpendicular to the rotation axis and away from the stator. Multiple fixed elements are provided, forming concentric rings along the radial direction of the second rotor. For example, within any ring formed by the fixed elements, the multiple fixed elements are evenly arranged along the circumference of the second rotor.

[0011] In a second aspect, the present application provides an assembly method of the above-mentioned disc motor, the assembly method comprising the following steps:

[0012] Performing dynamic balancing adjustment on the first shaft body and the first rotor that are fixedly connected, and performing dynamic balancing adjustment on the second shaft body and the second rotor that are fixedly connected;

[0013] The stator is sleeved on at least one of the first shaft and the second shaft, and the first shaft and the second shaft are fixedly connected.

[0014] In an optional implementation, dynamic balancing is performed on the fixedly connected first shaft and first rotor, including: adjusting the weight adjustment component so that, at a preset speed, the deviation between the center of mass and the center of rotation of the rotating unit composed of the first shaft and the first rotor meets a preset dynamic balancing grade standard.

[0015] In an optional implementation, dynamic balancing is performed on the fixedly connected second shaft and second rotor, including: adjusting the weight adjustment component so that, at a preset speed, the deviation between the center of mass and the center of rotation of the rotating unit composed of the second shaft and the second rotor meets a preset dynamic balancing grade standard.

[0016] In a third aspect, the present application further provides a powertrain, which may include a transmission mechanism and the disc motor of the first aspect of the present application, wherein the transmission mechanism is connected to the disc motor and the disc motor can drive the transmission mechanism to move.

[0017] In a fourth aspect, the present application also provides a vehicle, which includes the disc motor of the present application.

[0018] The technical effects that can be achieved in the second to fourth aspects mentioned above can be described with reference to the corresponding effects in the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a disc motor according to an embodiment;

[0020] Figure 2A schematic structural diagram of the bonded connection between the first shaft and the second shaft;

[0021] Figure 3 This is a schematic diagram of another connection method between the first shaft and the second shaft;

[0022] Figure 4 A schematic diagram of another connection method between the first shaft and the second shaft;

[0023] Figure 5 is a schematic structural diagram of the surface of the first rotor away from the stator;

[0024] Figures 6 and 7 This is a schematic diagram of the assembly process of the disc motor of this application.

[0025] Reference numerals:

[0026] 10-disc motor; 11-first rotor; 12-stator; 13-second rotor; 14-rotating shaft; 141-first shaft;

[0027] 142 - second shaft; 143 - positioning protrusion; 144 - positioning step; 145 - first keyway; 146 - second keyway;

[0028] 147-connecting key; 148-coupling; 149-first flange; 150-second flange;

[0029] 15-bearing; 16-magnet; 20-weight adjustment assembly; 21-fixing element; 22-weight adjustment block. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0031] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the", and "this" are intended to also include expressions such as "one or more", unless the context clearly indicates otherwise.

[0032] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0033] For ease of understanding, the dynamic balance mentioned in this application is first explained. Dynamic balancing is a research topic in rotor dynamics, which refers to the operation of determining the position and size of the imbalance (centrifugal force and centrifugal couple) generated when the rotor rotates and eliminating it. The imbalance will cause lateral vibration of the rotor and subject the rotor to unnecessary dynamic loads, which is not conducive to the normal operation of the rotor. Therefore, the rotor needs to be dynamically balanced before assembly of the motor so that its center of mass and center of rotation are as close as possible during rotation.

[0034] Currently, there is no mature dynamic balancing adjustment solution for multi-rotor disc motors (such as a dual-rotor, single-stator disc motor). Most rotors are individually balanced using dummy shafts before being assembled as a whole. This adjustment solution does not consider the impact of the dummy shaft on dynamic balancing, which can reduce the reliability of the disc motor's bearings and may introduce excessive vibration (i.e., the motor's vibration amplitude exceeds the preset value).

[0035] In response to the above problems, the present application provides a disc motor. Figure 1 FIG. 1 is a schematic structural diagram of a disc motor 10 according to an embodiment of the present invention. Figure 1 As shown, in one embodiment, the disc motor 10 includes a rotating shaft 14 and a first rotor 11, a stator 12, and a second rotor 13 disposed on the rotating shaft 14. The first rotor 11 and the second rotor 13 are respectively disposed on either side of the stator 12, with gaps being left between the first rotor 11 and the second rotor 13 and the stator 12. The first rotor 11, the stator 12, and the second rotor 13 can all be disc-shaped structures, and the radial dimensions of the three can be the same.

[0036] like Figure 1As shown, the rotating shaft 14 may include a first shaft body 141 and a second shaft body 142. The first shaft body 141 and the second shaft body 142 are detachably connected. By way of example, the connection between the first shaft body 141 and the second shaft body 142 may be an interference fit, a keyed connection, a coupling, a pin connection, or a flange connection. Keyed connections include, but are not limited to, flat key connections, spline connections, or wedge key connections. The various connection methods for the first shaft body 141 and the second shaft body 142 will be described in detail below with reference to the accompanying drawings.

[0037] by Figure 1 For example, the first shaft body 141 and the second shaft body 142 can be connected by an interference fit. Specifically, the first shaft body 141 and the second shaft body 142 can both be hollow shaft bodies, i.e., the interior of the first shaft body 141 can be provided with an axially extending through hole, and the interior of the second shaft body 142 can also be provided with an axially extending through hole, and the outer circumferential surface of the first shaft body 141 can be partially inserted into the through hole of the second shaft body 142. After the first shaft body 141 is partially inserted into the second shaft body 142, the circumferential surface of the first shaft body 141 abuts against the inner circumferential surface of the second shaft body 142, generating a certain friction force between the two, thereby forming an interference fit connection.

[0038] Continue to refer to Figure 1 In an optional embodiment, a positioning protrusion 143 may be provided on the outer circumference of the first shaft body 141. The positioning protrusion 143 may be an annular protrusion provided along the outer circumference of the first shaft body 141. Similarly, a positioning step 144 may be provided on the inner circumference of the second shaft body 142. The positioning step 144 may be an annular step surface provided inside the second shaft body 142. The through hole in the second shaft body 142 may be formed by connecting two sub-holes with different inner diameters, thereby forming a positioning step between the two connected sub-holes. By providing the positioning protrusion 143 and the positioning step 144, the purpose of positioning connection between the first shaft body 141 and the second shaft body 142 can be achieved, so that the size requirements of the assembly can be met.

[0039] Combine Figure 2 Another connection method of the first shaft 141 and the second shaft 142 is explained. Figure 2The figure is a schematic structural diagram of the keyed connection between the first shaft body 141 and the second shaft body 142. In addition to being connected by an interference fit, the first shaft body 141 and the second shaft body 142 can also be connected by a key. For example, the outer circumference of the first shaft body 141 can be provided with a first keyway 145, and the outer circumference of the second shaft body 142 can also be provided with a second keyway 146 that matches the first keyway 145. The first keyway 145 can be a recessed groove, and the second keyway 146 can be a through groove. When fixing the first shaft body 141 and the second shaft body 142, the first keyway 145 and the second keyway 146 can be aligned, and then a connecting key 147 can be inserted into the first keyway 145 and the second keyway 146 at the same time. The connecting key 147 is used to fix the first shaft body 141 and the second shaft body 142 to achieve a keyed connection. The connecting key 147 includes but is not limited to a flat key, a spline, or a wedge key.

[0040] Figure 3 FIG. 1 is a schematic diagram of another connection method between the first shaft 141 and the second shaft 142. Figure 3 As shown, the first shaft body 141 and the second shaft body 142 can be fixedly connected via a coupling 148 .

[0041] Figure 4 Schematic diagram of another connection method between the first shaft 141 and the second shaft 142, as shown in Figure 4 As shown, a first flange 149 can be provided at the end of the first shaft body 141 close to the second shaft body 142, and a second flange 150 can be provided at the end of the second shaft body 142 close to the first shaft body 141. The first shaft body 141 and the second shaft body 142 can be fixedly connected through the first flange 149 and the second flange 150.

[0042] The above connection method of the first shaft 141 and the second shaft 142 is only an example description. The present application does not limit the specific connection method of the first shaft 141 and the second shaft 142, as long as a fixed connection between the two can be achieved.

[0043] Continue to refer to Figure 1 , the connection method between the shaft, the stator, the first rotor and the second rotor will be explained below.

[0044] Among them, reference Figure 1The first shaft 141 can be fixedly connected to the first rotor 11, and the connection between the first shaft 141 and the first rotor 11 can be an interference fit connection or a keyed connection. The second shaft 142 can be fixedly connected to the second rotor 13, and the connection between the second shaft 142 and the second rotor 13 can be an interference fit connection or a keyed connection. Therefore, after the first shaft 141 and the second shaft 142 are fixedly connected to form the rotating shaft 14, there is no relative movement between the first rotor 11 and the rotating shaft 14 in the circumferential and axial directions of the rotating shaft 14, and there is no relative movement between the second rotor 13 and the rotating shaft 14 in the circumferential and axial directions of the rotating shaft 14. During the operation of the disc motor 10, when the first rotor 11 and the second rotor 13 rotate, they can drive the rotating shaft 14 to rotate together, thereby achieving synchronous rotation of the rotating shaft 14, the first rotor 11 and the second rotor 13.

[0045] Continue to refer to Figure 1 The stator 12 is rotationally connected to the rotating shaft 14. A bearing 15 may be provided between the stator 12 and the rotating shaft 14 to achieve rotational connection between the stator 12 and the rotating shaft 14. It should be noted that the disc motor 10 may include, in addition to the aforementioned rotating shaft 14, the first rotor 11, the second rotor 13, and the stator 12, a housing (not shown) for enclosing the aforementioned components. The stator 12 may be fixedly connected to the housing to increase the stability of the connection of the stator 12.

[0046] Continue to refer to Figure 1 In the embodiment of the present application, magnets 16 may be disposed on both the surface of the first rotor 11 facing the stator 12 and the surface of the second rotor 13 facing the stator 12. A groove for accommodating magnets 16 may be disposed on both the surface of the first rotor 11 facing the stator 12 and the surface of the second rotor 13 facing the stator 12 to accommodate magnets 16. The shape of magnets 16 may be annular or other shapes, and the specific shape and size may be determined based on the specific performance parameters of the disc motor 10.

[0047] Figure 5 FIG. 1 is a schematic diagram of the surface structure of the first rotor 11 on the side away from the stator 12 according to an embodiment of the present invention. Figure 1 and Figure 5 As shown, a weight balancing assembly 20 can be provided on the side of the first rotor 11 perpendicular to the rotating shaft 14 and facing away from the stator 12, that is, the side facing away from the magnet 16. A weight balancing assembly can also be provided on the side of the second rotor 13 perpendicular to the rotating shaft 14 and facing away from the stator 12. The weight balancing assembly 20 can be provided solely on the first rotor 11, solely on the second rotor 13, or on both the first rotor 11 and the second rotor 13. For ease of adjustment, weight balancing assemblies 20 can be provided on both the first rotor 11 and the second rotor 13.

[0048] The weight balancing assembly 20 can be installed not only on the side of the first rotor 11 perpendicular to the shaft 14, but also on the circumferential side of the first rotor 11, thereby also achieving the corresponding adjustment function. Similarly, the weight balancing assembly 20 can also be installed on the circumferential side of the second rotor 13. The weight balancing assembly 20 can be installed on the circumferential side of the first rotor 11, the circumferential side of the second rotor 13, or both the circumferential sides of the first rotor 11 and the second rotor 13.

[0049] Taking the first rotor 11 as an example, Figure 5 As shown, in one embodiment, the weight adjustment assembly 20 includes a fixing element 21 provided on the first rotor 11 and a weight adjustment block 22 connected to the fixing element 21. The fixing element 21 can be an opening or a protruding column for fixing the weight adjustment block 22. The weight adjustment block 22 can be a standard nut, for example. During the dynamic balancing adjustment process, the weight of the first rotor 11 can be increased or decreased by adding or removing the weight adjustment block 22. Figure 1 and Figure 5 During dynamic balancing, the residual unbalance of the rotating unit consisting of the first shaft 141 and the first rotor 11 can be adjusted by adding or removing weight. The residual unbalance can be measured using dynamic balancing equipment in units of mg*mm until the residual unbalance reaches a preset dynamic balancing standard, such as the G2.5 or G1.0 grade standards specified in GB / T 9239.1. The maximum residual unbalance of the rotating object at the highest speed can be calculated based on the relevant testing standards in GB / T 9239.1 and the corresponding preset dynamic balancing grade standards. Accordingly, the residual unbalance of the rotating unit consisting of the second shaft 142 and the second rotor 13 can be adjusted in the same manner as described above, and will not be repeated here.

[0050] When dynamic balancing is adjusted by adding weight, adjustment can be performed by adding adjustment blocks to the fixed element 21. When dynamic balancing is adjusted by reducing weight, in addition to adjusting the number of adjustment weights 22, adjustment can also be performed by opening holes in the first rotor 11 and the second rotor 13. The specific weight adjustment method is not specifically limited in this embodiment of the application.

[0051] Continue to refer to Figure 5 In the first rotor 11, there are multiple fixing elements 21, and along the radial direction of the first rotor 11, the multiple fixing elements 21 form concentric rings; and in any ring formed by the fixing elements 21, the multiple fixing elements 21 are evenly arranged along the circumference of the first rotor 11.

[0052] The structure of the weight-adjusting assembly of the second rotor 13 may refer to the weight-adjusting assembly of the first rotor 11 , and will not be described again herein.

[0053] Figures 6 and 7 This is a schematic diagram of the assembly process of the disc motor 10 of this application. Figure 6 and Figure 7 The assembly process of the disk motor 10 according to the embodiment of the present application is explained. For example, the assembly process of the disk motor 10 according to the embodiment of the present application includes the following steps:

[0054] Step S11, reference Figure 6 , the first rotor 11 is sleeved and fixed on the first shaft 141, and the first shaft 141 and the first rotor 11 are dynamically balanced;

[0055] Step S12, refer to Figure 6 , the second rotor 13 is sleeved and fixed on the second shaft 142, and the second shaft 142 and the second rotor 13 are dynamically balanced;

[0056] Step S13, refer to Figure 7 , the stator 12 is sleeved and fixed on the first shaft body 141 or the second shaft body 142 , and then the first shaft body 141 and the second shaft body 142 are fixedly connected.

[0057] The order of steps S11 to S13 is merely an example, and the order can be adjusted according to actual needs, and is not specifically limited here.

[0058] Among them, the dynamic balance adjustment of the rotating unit composed of the first shaft body 141 and the first rotor 11 includes the following steps: adjusting the weight adjustment component so that the deviation between the center of mass and the rotation center of the rotating unit composed of the first shaft body 141 and the first rotor 11 meets the preset dynamic balance grade standard at a preset speed, such as the grade standards specified in GB / T 9239.1, such as G2.5 and G1.0.

[0059] Similarly, the dynamic balance adjustment of the rotating unit composed of the second shaft 142 and the second rotor 13 includes the following steps: adjusting the weight adjustment component so that, at a preset speed, the deviation between the center of mass and the center of rotation of the rotating unit composed of the second shaft 142 and the second rotor 13 meets the preset dynamic balance grade standard, such as the grade standards specified in GB / T 9239.1, such as G2.5 and G1.0.

[0060] The disc motor 10 of the embodiment of the present application divides the rotating shaft 14 into a first shaft body 141 and a second shaft body 142 that are detachably connected. Before assembly, dynamic balancing is first performed on each rotor system, and the disc motor 10 is assembled after the dynamic balancing adjustment of each rotor system is completed. When dynamic balancing is performed on a single rotor system, the dynamic balancing index of the single rotor system can be strictly controlled so that the overall dynamic balance of the final disc motor 10 meets the use requirements. During the assembly process, the dynamic balancing of the entire machine only introduces an assembly error once. The influence of this error can be eliminated by the residual unbalance of each of the two rotor systems and the assembly dimensional error (such as interference, coaxiality and other parameters), thereby achieving effective control of the residual unbalance of the entire machine. In addition, in the assembly method of the disc motor 10 of the embodiment of the present application, while ensuring the convenience of assembly, the quality of the dynamic balancing of the entire machine can also be significantly improved.

[0061] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A disc motor, characterized in that: The invention comprises a rotating shaft and a first rotor, a stator, and a second rotor sleeved on the rotating shaft, wherein the first rotor, the stator, and the second rotor are arranged in sequence and at intervals, and the stator is rotatably connected to the rotating shaft, wherein the rotating shaft comprises a first shaft body and a second shaft body that are detachably connected, the first shaft body is fixedly connected to the first rotor, and the second shaft body is fixedly connected to the second rotor; The deviation between the center of mass and the center of rotation of the rotating unit composed of the first shaft and the first rotor fixedly connected meets the preset dynamic balance grade standard, and the deviation between the center of mass and the center of rotation of the rotating unit composed of the second shaft and the second rotor fixedly connected meets the preset dynamic balance grade standard.

2. The disc motor according to claim 1, characterized in that: The connection between the first shaft body and the second shaft body includes an interference fit connection, a keyed connection, a coupling connection, a pin connection or a flange connection.

3. The disc motor according to claim 1, characterized in that: A weight adjustment component is provided on at least one of a surface of the first rotor that is perpendicular to the rotating shaft and away from the stator and a surface of the second rotor that is perpendicular to the rotating shaft and away from the stator.

4. The disc motor according to claim 1, characterized in that A weight adjustment component is provided on at least one of the circumferential surface of the first rotor and the circumferential surface of the second rotor.

5. The disc motor according to claim 3 or 4, characterized in that: The weight adjustment assembly includes a fixing element provided on the first rotor and / or the second rotor and a weight adjustment block cooperatively connected with the fixing element.

6. The disc motor according to claim 5, characterized in that: The fixing element is provided on a side surface of the first rotor perpendicular to the rotating shaft and away from the stator. There are multiple fixing elements, and along the radial direction of the first rotor, the multiple fixing elements form concentric rings.

7. The disc motor according to claim 6, characterized in that: In any circular ring formed by the fixing elements, a plurality of the fixing elements are evenly arranged along the circumference of the first rotor.

8. The disk motor according to claim 5, characterized in that: The fixing element is provided on a side surface of the second rotor perpendicular to the rotating shaft and away from the stator. There are multiple fixing elements, and along the radial direction of the second rotor, the multiple fixing elements form concentric rings.

9. The disc motor according to claim 8, characterized in that: In any circular ring formed by the fixing elements, a plurality of the fixing elements are evenly arranged along the circumference of the second rotor.

10. The disk motor according to claim 5, characterized in that The fixing element includes an opening or a protruding column.

11. An assembly method of a disc motor according to any one of claims 1 to 10, characterized in that: include: Performing dynamic balancing adjustment on the first shaft body and the first rotor that are fixedly connected, and performing dynamic balancing adjustment on the second shaft body and the second rotor that are fixedly connected; The stator is sleeved on at least one of the first shaft and the second shaft, and the first shaft and the second shaft are fixedly connected.

12. The assembly method according to claim 11, characterized in that: The step of dynamically balancing the first shaft and the first rotor, which are fixedly connected to each other, includes: The weight-adjusting assembly is adjusted so that, at a preset rotation speed, the deviation between the center of mass and the center of rotation of the rotating unit composed of the first shaft and the first rotor meets the preset dynamic balance grade standard.

13. The assembly method according to claim 11, characterized in that: The dynamic balancing adjustment of the fixedly connected second shaft and the second rotor includes: The weight-adjusting assembly is adjusted so that, at a preset rotation speed, the deviation between the center of mass and the center of rotation of the rotating unit composed of the second shaft and the second rotor meets the preset dynamic balance grade standard.

14. A powertrain, characterized in that: The disc motor comprises a transmission mechanism and the disc motor according to any one of claims 1 to 10 connected to the transmission mechanism.

15. A vehicle, characterized in that: It comprises a vehicle frame and a driving system mounted on the vehicle frame, wherein the driving system comprises wheels and a disc motor as claimed in any one of claims 1 to 10, and the disc motor is used to drive the wheels to rotate.

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