Double-rotor asymmetric disc type motor
By using a dual-rotor asymmetric disc motor in a high-speed centrifugal fan, the asymmetric magnetic suction force is used to offset the axial pneumatic power, which solves the problem of aggravated bearing wear and achieves a longer service life and more stable operation.
Patent Information
- Application Number
- CN202421519516.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-06-28
AI Technical Summary
When high-speed centrifugal fans rotate at high speed, the axial pneumatic power generated by the turbine on the motor shaft will lead to unstable bearing operation and aggravate wear. The prior art shares the pneumatic axial force by increasing the number of bearings, but still affects the bearing life.
The dual-rotor asymmetric disc motor is adopted to generate a reverse axial magnetic suction force through the asymmetrically arranged stator assembly and rotor assembly, which offsets the axial pneumatic power of the fan when the fan rotates at high speed, and further improves the service life through the axial magnetic suction stabilization mechanism.
It effectively balances the axial load on the bearing when the fan rotates at high speed, slows down bearing wear, increases service life, and improves operation stability.
Smart Images
Figure CN222763663U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of motor technology, and specifically provides a dual-rotor asymmetric disc motor. Background Art
[0002] When the centrifugal fan rotates at high speed, the turbine will generate an axial aerodynamic force on the motor shaft toward the turbine. As the speed increases, the axial aerodynamic force can reach the order of 100 to 200 N. The above axial aerodynamic force acts on the bearing, which will affect the operating stability of the bearing and increase its friction and wear. Therefore, the existing high-speed centrifugal fan adopts the method of setting two bearings in front and one in the back, and sets a DT-assembled ceramic angular contact bearing at the front end to share the aerodynamic axial force and improve the service life.
[0003] Although the high-speed centrifugal fan adopting the above solution can share the aerodynamic axial force by increasing the number of bearings, the continuous bearing of the axial force will still have a significant impact on the life of the bearings. According to statistics on the use of existing 15KW high-speed centrifugal fans, the motor bearings of most fans need to be replaced after the running time reaches 4000 to 8000 hours. Therefore, it is urgent to provide a new type of motor that can solve the wear problem of the bearings caused by the above-mentioned aerodynamic axial force. Utility Model Content
[0004] In order to solve the problems existing in the above-mentioned prior art, the present application provides a dual-rotor asymmetric disc motor, which includes a housing assembly, a bearing assembly, a main shaft and at least one asymmetric single-stator dual-rotor combination; a space for accommodating the main shaft and the asymmetric single-stator dual-rotor combination is formed inside the housing assembly, and the main shaft is rotatably connected to the housing assembly through the bearing assembly, and one end thereof protrudes to the outside of the housing assembly to form a main shaft output end; each group of asymmetric single-stator dual-rotor combinations includes a first rotor assembly, a stator assembly, and a second rotor assembly which are sequentially sleeved on the main shaft along the axial direction, and the first rotor assembly The axial distance between the first rotor assembly and the output end of the main shaft is smaller than the axial distance between the second rotor assembly and the output end of the main shaft; the first rotor assembly includes a plurality of first N-pole magnets and a first S-pole magnet facing the stator assembly, the second rotor assembly includes a plurality of second N-pole magnets and a second S-pole magnet facing the stator assembly, the stator assembly includes an iron core, a plurality of first coil windings wound on the iron core, and a plurality of second coil windings wound on the iron core; in each asymmetric single-stator double-rotor combination, the axial magnetic attraction F1 of the stator assembly on the first rotor assembly is greater than the axial magnetic attraction F2 of the stator assembly on the second rotor assembly.
[0005] Preferably, F1 and F2 satisfy:
[0006]
[0007] Furthermore, the iron core includes a plurality of first teeth facing the first rotor assembly side and a plurality of second teeth facing the second rotor assembly side, each group of first coil windings is wound around each first tooth, and each group of second coil windings is wound around each second tooth.
[0008] Preferably, the radial lengths of the first N-pole magnet and the first S-pole magnet are greater than the radial lengths of the second N-pole magnet and the second S-pole magnet, and / or the radial size of the first tooth pole of the iron core is greater than the radial size of the second tooth pole thereof.
[0009] Preferably, the axial distance between the first N-pole magnet and the first S-pole magnet and the first tooth pole is set to be smaller than the axial distance between the second N-pole magnet and the second S-pole magnet and the second tooth pole.
[0010] Furthermore, the multiple first N-pole magnets and the first S-pole magnets are alternately arranged along the circumferential direction; the multiple second N-pole magnets and the second S-pole magnets are alternately arranged along the circumferential direction; the multiple groups of first coil windings are arranged on the side of the iron core facing the first rotor assembly and are distributed at intervals along the circumferential direction, and the multiple groups of second coil windings are arranged on the side of the iron core facing the second rotor assembly and are distributed at intervals along the circumferential direction.
[0011] Preferably, the housing assembly comprises a front cover and a shell, and the front cover and the shell are detachably fixedly connected; the front cover is provided with a through hole for the spindle output end to pass through.
[0012] Preferably, the bearing assembly comprises a first bearing and a second bearing, and an axial distance between the first bearing and the output end of the main shaft is smaller than an axial distance between the second bearing and the output end of the main shaft.
[0013] Preferably, a pre-tightening structure is further included, and the pre-tightening structure is elastically abutted between the housing and a side of the second bearing facing away from the main shaft output end.
[0014] Preferably, it also includes an axial magnetic attraction force stabilization mechanism, which includes a compression spring and a spring retaining ring sleeved on the main shaft; the spring retaining ring is located on the side of the first bearing facing away from the main shaft output end; the compression spring is located between the spring retaining ring and a spring blocking structure fixedly arranged on the main shaft or the first rotor assembly.
[0015] The dual-rotor asymmetric disc motor provided by the embodiment of the present application has at least the following beneficial effects:
[0016] 1. The asymmetrically arranged stator assembly and the first rotor assembly and the second rotor assembly generate an additional axial magnetic attraction force on the main shaft in the opposite direction to the axial aerodynamic force, thereby balancing the axial load applied to the bearing under the high-speed rotation condition of the fan, and specifically alleviating the problem of aggravated bearing wear caused by large axial aerodynamic force;
[0017] 2. By setting up the axial magnetic attraction stabilization mechanism, the service life and operation stability of the high-speed fan can be further effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 A perspective view of a dual-rotor asymmetric disc motor provided according to some embodiments of the present application;
[0019] Figure 2 An exploded view of a dual-rotor asymmetric disc motor according to some embodiments of the present application;
[0020] Figure 3 An exploded view of an asymmetric single-stator dual-rotor combination provided according to some embodiments of the present application;
[0021] Figure 4 An exploded view of an asymmetric single-stator dual-rotor combination provided according to some embodiments of the present application;
[0022] Figure 5 A schematic diagram of the structure of an iron core provided according to some embodiments of the present application;
[0023] Figure 6 A front view of a centrifugal fan provided according to some embodiments of the present application;
[0024] Figure 7 for Figure 6 A cross-sectional view of a centrifugal fan is provided;
[0025] Figure 8a-8c This is a schematic diagram of the axial force conditions of a centrifugal fan in different states in an embodiment of the present application;
[0026] Fig. 9 A partially enlarged schematic diagram of an axial magnetic attraction stabilization mechanism provided according to some embodiments of the present application;
[0027] Fig.10 A partially enlarged schematic diagram of an axial magnetic attraction stabilization mechanism provided according to some embodiments of the present application;
[0028] Numbers in the figure
[0029] Volute 1, turbine 2, dual-rotor asymmetric disc motor 3, main shaft 30, collar 301, first rotor assembly 31, first back plate 311, first N-pole magnet 3121, first S-pole magnet 3122, second rotor assembly 32, second back plate 321, second N-pole magnet 3221, second S-pole magnet 3222, stator assembly 33, fixing portion 331, core 332, first tooth pole 3321, second tooth pole 3322, isolating portion 3323, first coil winding 3331, second coil winding 3332, first bearing 341, second bearing 342, housing 35, axial magnetic attraction stabilizing mechanism 36, compression spring 361, spring retaining ring 362, front cover 37. DETAILED DESCRIPTION
[0030] The present application is further described below based on preferred embodiments and with reference to the accompanying drawings. For ease of understanding, various components on the drawings are enlarged or reduced, but this practice is not intended to limit the protection scope of the present application.
[0031] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the products of the embodiments of the present application are usually placed when in use, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present application, in order to distinguish different units, the words first, second, etc. are used in this specification, but these are not limited by the order of manufacture, nor can they be understood as indicating or implying relative importance, and their names may be different in the detailed description and claims of the present application.
[0032] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "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, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.
[0033] The present application provides a dual-rotor asymmetric disc motor, Figure 1 is a three-dimensional view of the motor provided according to some embodiments of the present application, Figure 2-Figure 4 They are respectively exploded schematic diagrams of motors in some embodiments, Figure 5 The schematic diagram of the core structure is shown. Figure 1-Figure 5As shown, in some embodiments, the dual-rotor asymmetric disc motor of the present application includes a main shaft 30 and at least one single-stator dual-rotor combination consisting of a first rotor assembly 31, a stator assembly 33, and a second rotor assembly 32, wherein the first rotor assembly 31, the stator assembly 33, and the second rotor assembly 32 are sequentially sleeved on the main shaft 30 from one end to the other end of the main shaft 30, and both rotor assemblies are fixedly connected to the main shaft 30. When in use, the end of the main shaft 30 close to the first rotor assembly 31 is the main shaft output end, which can be fixedly connected to other actuators such as the turbine of a fan, thereby driving the actuator to rotate.
[0034] Furthermore, the motor also includes a housing assembly consisting of a front cover 37 and a housing 35, wherein the front cover 37 and the housing 35 can be detachably connected by mutually matching bolts-screw holes or other alternative methods, and a space for accommodating the main shaft 30 and the asymmetric single-stator dual-rotor combination is formed therein. The front cover 37 is provided with a through hole for the output end of the main shaft 30 to pass through, and is sleeved on the main shaft 30 close to the first rotor assembly 31. When the motor is used as a driving component of a centrifugal fan, the front cover 37 can be used as a connecting flange for connecting to structures such as a volute of the centrifugal fan.
[0035] The stator assembly 33 is fixedly connected to the housing 35, and the bearing assembly includes a first bearing 341 and a second bearing 342. The inner ring of the first bearing 341 is sleeved on the main shaft 30 close to the first rotor assembly 31 side, and the inner ring of the second bearing 342 is sleeved on the main shaft 30 close to the second rotor assembly 32 side, and is axially limited by a stepped shoulder structure formed on the main shaft 30. At the same time, the outer rings of the two bearings are fixedly connected to the front cover 37 and the housing 35 respectively, so that the main shaft 30 can rotate relative to the front cover 37 and the housing 35.
[0036] In some preferred embodiments, the motor further includes a pre-tightening structure, by which a pre-tightening force is applied to the main shaft 30 to ensure good axial limitation of the main shaft 30. Specifically, the pre-tightening structure can adopt a wave spring, or a similar elastic retaining ring that can provide elastic force, etc., which is sleeved on the main shaft 30 and elastically abuts against the side of the second bearing 342 facing away from the output end of the main shaft 30 and the housing 35 respectively. During the motor assembly process, the pre-tightening structure is gradually compressed and a pre-tightening force is applied to the main shaft 30 through the second bearing 342.
[0037] In some preferred embodiments, the first bearing 341 and the second bearing 342 may be ceramic angular contact bearings to improve the bearing capacity of the bearings to the axial load and extend the bearing life.
[0038] In some preferred embodiments, an anti-creep O-ring is sleeved between the retaining frame and the outer ring of the second bearing 342 to prevent radial creep from occurring during the rotation of the main shaft 30 .
[0039] The specific structure of the asymmetric single-stator and double-stator combination in the motor is described in detail below with reference to the accompanying drawings.
[0040] As shown in the figure, the outer side of the stator assembly 33 is a fixing portion 331, which is used to be fixedly connected to the housing 35 and accommodate the iron core 332 and each group of coil windings therein.
[0041] The iron core 332 can be made of a material with high magnetic permeability and low hysteresis loss characteristics such as silicon steel, and a plurality of first tooth poles 3321 distributed circumferentially and extending radially are formed on the side facing the first rotor assembly 31, and a plurality of first coil windings 3331 are wound thereon; similarly, a plurality of second tooth poles 3322 distributed circumferentially and extending radially are formed on the side facing the second rotor assembly 32, and a plurality of second coil windings 3332 are wound thereon. Furthermore, an isolation portion 3323 with a certain axial thickness is formed between the first tooth poles 3321 and the second tooth poles 3322.
[0042] The first rotor assembly 31 includes a circular ring-shaped back plate 311, and a plurality of first N-pole magnets 3121 and first S-pole magnets 3122, wherein the back plate 311 is sleeved on the main shaft 30 and fixedly connected to the main shaft 30, and the first N-pole magnets 3121 and the first S-pole magnets 3122 are fixedly arranged on the side of the back plate 311 facing the stator assembly 33, and are alternately arranged along the circumferential direction; correspondingly, the second rotor assembly 32 includes a circular ring-shaped back plate 321, and a plurality of second N-pole magnets 3221 and second S-pole magnets 3222, wherein the back plate 321 is sleeved on the main shaft 30 and fixedly connected to the main shaft 30, and the second N-pole magnets 3221 and the second S-pole magnets 3222 are fixedly arranged on the side of the back plate 321 facing the stator assembly 33, and are alternately arranged along the circumferential direction.
[0043] Each group of first coil windings 3331 and second coil windings 3332 can be driven by alternating current or direct current, and the current directions in the first coil windings 3331 and second coil windings 3332 are alternately changed through various known motor control methods, thereby achieving alternating changes in the polarity of the electromagnetic field, thereby driving the rotor assembly to drive the main shaft 30 to rotate relative to the housing 35. The working principle of the above motor is already known to those skilled in the art and will not be described in detail here.
[0044] During the operation of the fan with a turbine-volute structure, when the airflow passes through the impeller of the centrifugal fan, the curvature and angle design of the blades cause the airflow to generate a pressure gradient on the impeller, thereby generating aerodynamic force, wherein the aerodynamic force axially directed from the motor to the impeller is called axial aerodynamic force. Since the bearings mounted on the main shaft 30 are positioned by structures such as the shaft shoulder of the main shaft 30, the above-mentioned axial aerodynamic force will also be transmitted to the bearings. During the high-speed rotation of the fan, the above-mentioned axial aerodynamic force will greatly increase the friction of the bearings, accelerate their wear rate and affect their operating stability.
[0045] To this end, in an embodiment of the present application, the stator assembly 33 and the two rotor assemblies on both sides of the dual-rotor asymmetric disc motor 3 are arranged asymmetrically to actively generate additional axial magnetic attraction force for offsetting the axial aerodynamic force.
[0046] Specifically, in the embodiment of the present application, for each single-stator dual-rotor combination, the axial distance between the second rotor assembly 32 and the output end of the main shaft 30 is greater than the axial distance between the first rotor assembly 31 and the output end of the main shaft 30, that is, the second rotor assembly 32 is farther away from the output end of the main shaft 30 than the first rotor assembly 31, and at the same time, the axial magnetic attraction F1 generated by the iron core 332 in the stator assembly 33 on the first N-pole magnet 3121 and the first S-pole magnet 3122 in the first rotor assembly 31 in the direction away from the output end of the main shaft 30 is greater than the axial magnetic attraction F1 generated by the iron core 332 in the stator assembly 33 on the first N-pole magnet 3121 and the first S-pole magnet 3122 in the first rotor assembly 31 in the direction away from the output end of the main shaft 30. The second N-pole magnet 3221 and the second S-pole magnet 3222 in 2 generate an axial magnetic attraction force F2 toward the output end of the main shaft 30. Therefore, the stator assembly 33 will generate an axial magnetic attraction force F1-F2 on the two rotor assemblies in the opposite direction to the axial aerodynamic force. The axial magnetic attraction force is further transmitted to the main shaft 30 through the two rotor assemblies, thereby effectively offsetting the axial load on the bearing imposed by the axial aerodynamic force generated during the high-speed operation of the fan, greatly delaying the wear rate of the bearing, and effectively increasing its operation stability and service life.
[0047] A variety of implementations can be used to generate the above-mentioned axial magnetic attraction force. For example, in some preferred embodiments, the radial length H1 of the first N-pole magnet 3121 and the first S-pole magnet 3122 can be set to be greater than the radial length H2 of the second N-pole magnet 3221 and the second S-pole magnet 3222. In other preferred embodiments, the radial dimension h1 of the first tooth pole 3321 on the side of the iron core 332 facing the first rotor assembly 31 can also be set to be greater than the radial dimension h2 of the second tooth pole 3322 on the side facing the second rotor assembly 32. Through the asymmetric arrangement of the magnets and / or the iron core, the stator assembly 33 can always apply an axial magnetic attraction force of magnitude F1-F2 to the two rotor assemblies in the opposite direction to the axial aerodynamic force.
[0048] For example, in some other preferred embodiments, the axial distance between the first N-pole magnet 3121 and the first S-pole magnet 3122 and the first tooth pole 3321 can be set to be smaller than the axial distance between the second N-pole magnet 3221 and the second S-pole magnet 3222 and the second tooth pole 3322, and an axial magnetic attraction force in the opposite direction to the axial aerodynamic force is generated by adjusting the spacing between the stator assembly 33 and the two rotor assemblies.
[0049] Figure 6 , Figure 7 The front view and the cross-sectional view of a centrifugal fan driven by the dual-rotor asymmetric disc motor are shown in some embodiments. Figure 6 , Figure 7 As shown, the centrifugal fan includes a volute 1, a turbine 2 and the dual-rotor asymmetric disc motor, wherein the front cover 37 serves as a connecting flange and is fixedly connected to the volute 1, and the turbine 2 is located in the volute 1 and is fixedly connected to the output end of the main shaft 30.
[0050] Figure 8a-8c The axial forces on the main shaft 30 when the centrifugal fan is in different states are shown respectively. Figure 8a , Figure 8b It can be seen that when the fan is in a stationary state, the axial aerodynamic force is zero, and there is only a rightward axial magnetic attraction force, which is transmitted from the main shaft 30 to the second bearing 342 (it should be noted that when a pre-tightening structure exists, the second bearing 342 is always subject to the pre-tightening force applied by the pre-tightening structure). However, since the main shaft 30 does not rotate at this time, it will not cause wear on the bearing. During the acceleration process of the fan, as the axial aerodynamic force gradually increases from zero, the difference between the axial aerodynamic force and the axial magnetic attraction force gradually reaches a balance, and the axial force acting on the second bearing 342 gradually decreases, thereby reducing the bearing wear problem caused by the larger axial force when the main shaft 30 rotates. Furthermore, as Figure 8c As shown, the axial magnetic attraction resultant force can be set to be slightly smaller than the axial aerodynamic force of the fan when it is in the design working condition, that is, as the acceleration process continues, the resultant force of the axial magnetic attraction resultant force and the axial aerodynamic force on the second bearing 342 gradually decreases until they cancel each other out. When the speed continues to increase, the axial aerodynamic force will exceed the axial magnetic attraction resultant force, so that the resultant force of the two is to the left and transmitted to one side of the first bearing 341. Setting the value of the axial magnetic attraction resultant force to be slightly smaller than the axial aerodynamic force corresponding to the design working condition can ensure that the first bearing 341 is within a reasonable axial force range when the fan is working stably for a long time, thereby alleviating its friction loss and ensuring the stable operation of the fan.
[0051] Furthermore, in some preferred embodiments, the dual-rotor asymmetric disc motor also includes an axial magnetic attraction stabilizing mechanism 36, which is used to maintain the difference in axial magnetic attraction of the stator assembly 33 on the first rotor assembly 31 and the second rotor assembly 32 (i.e., F1-F2) within the design range. In order to ensure that the overall power of the fan reaches the design index, each N-pole magnet and S-pole magnet has a strong magnetic property. Therefore, the axial magnetic attraction F1 and F2 generated by the iron core of the stator assembly on the magnets on the rotor assemblies on both sides are much greater than the axial magnetic attraction F1-F2 ultimately formed by the stator assembly on the two rotor assemblies. For example, in some specific embodiments, the ratio of F1 and F2 to F1-F2 is 8 to 10 times. Therefore, the axial magnetic attraction force on the two rotor assemblies is quite sensitive to the change in the axial position of the main shaft 30, that is, a slight deviation of the main shaft 30 from the design position in the axial direction may cause the axial magnetic attraction of the two rotor assemblies to change. The resultant force F1-F2 changes greatly; however, there are assembly tolerances in the shaft system structure during the assembly process. At the same time, during the acceleration of the fan, as the axial aerodynamic force continues to increase and exceeds F1-F2, the main shaft 30 will inevitably have a slight displacement toward the output end of the main shaft 30, which will cause the F1 received by the first rotor assembly 31 to decrease rapidly and the F2 received by the second rotor assembly 32 to increase rapidly, resulting in a sharp drop in F1-F2, and further making the axial magnetic attraction force's offsetting effect on the axial aerodynamic force ineffective. Therefore, an axial magnetic attraction force stabilization mechanism 36 is required to prevent the tendency of the main shaft 30 to move so that it can generate a stable axial magnetic attraction force.
[0052] Specifically, Fig. 9 , Fig.10 The figures show the arrangement of the magnetic attraction stabilizing mechanism 36 in some preferred embodiments of the present application. As shown in the figure, the axial magnetic attraction stabilizing mechanism 36 includes a compression spring 361 and a spring retaining ring 362 which are sleeved on the main shaft 30, wherein the spring retaining ring 362 is located on the side of the first bearing 341 facing away from the output end of the main shaft 30, and the compression spring 361 is located between the spring retaining ring 362 and a spring blocking structure fixedly arranged on the main shaft 30 or the first rotor assembly 31.
[0053] Furthermore, the spring blocking structure can be implemented in a variety of ways, for example, Fig. 9 As shown, the side of the first rotor assembly 31 facing the first bearing 341 is used as a spring blocking structure. Fig.10 As shown in the embodiment of FIG. 3 , a protruding collar 301 is added to the main shaft 30 to serve as a spring blocking structure.
[0054] In some preferred embodiments, the motor further includes a sealing component. When the motor is used in an aeration system for aquaculture or in other relatively humid environments, the further setting of the sealing component can avoid the problem of humid water vapor entering the motor due to negative pressure generated by the cavity where the motor is located relative to the external environment after shutdown. Specifically, the sealing component includes a skeleton oil seal, which is sleeved on the main shaft 30 to seal the gap between the front cover 37 and the main shaft 30; further, the sealing component also includes a sealing ring, which is arranged between the front cover 37 and the housing 35. Specifically, the sealing ring is an elastic circle, which is pre-buried in the annular groove on the front cover 37. When the front cover 37 is assembled with the housing 35, the sealing ring is squeezed to achieve the sealing of the gap between the front cover 37 and the housing 35.
[0055] In some preferred embodiments, under the premise of meeting the total power requirements, more than or equal to two groups of asymmetric single-stator dual-rotor combinations can be set. By increasing the number of combinations, the power of each group of asymmetric single-stator dual-rotor combinations can be reduced accordingly, thereby achieving more precise adjustment of the axial magnetic attraction force.
[0056] The above is a detailed introduction to the specific implementation methods of the present application. For those skilled in the art, several improvements and modifications may be made to the present application without departing from the principles of the present application. These improvements and modifications also fall within the scope of protection of the claims of the present application.
Claims
1. A dual-rotor asymmetric disc motor, characterized in that: It includes a housing assembly, a bearing assembly, a main shaft and at least one asymmetric single-stator double-rotor combination; A space for accommodating the main shaft and the asymmetric single-stator dual-rotor combination is formed inside the housing component. The main shaft is rotatably connected to the housing component through the bearing component, and one end of the main shaft protrudes to the outside of the housing component to form a main shaft output end. Each asymmetric single-stator dual-rotor combination comprises a first rotor assembly, a stator assembly, and a second rotor assembly which are sequentially sleeved on the main shaft along the axial direction, and the axial distance between the first rotor assembly and the output end of the main shaft is smaller than the axial distance between the second rotor assembly and the output end of the main shaft; The first rotor assembly includes a plurality of first N-pole magnets and a first S-pole magnet facing the stator assembly, the second rotor assembly includes a plurality of second N-pole magnets and a second S-pole magnet facing the stator assembly, and the stator assembly includes an iron core, a plurality of first coil windings wound on the iron core, and a plurality of second coil windings wound on the iron core; In each asymmetric single-stator dual-rotor combination, the axial magnetic attraction F1 of the stator assembly on the first rotor assembly is greater than the axial magnetic attraction F2 of the stator assembly on the second rotor assembly.
2. The dual-rotor asymmetric disc motor according to claim 1, characterized in that: The F1 and F2 satisfy:
3. The dual-rotor asymmetric disc motor according to claim 1, characterized in that: The iron core includes a plurality of first teeth facing the first rotor assembly side and a plurality of second teeth facing the second rotor assembly side. Each group of first coil windings is wound around each first tooth, and each group of second coil windings is wound around each second tooth.
4. The dual-rotor asymmetric disc motor according to claim 3, characterized in that: The radial lengths of the first N-pole magnet and the first S-pole magnet are greater than the radial lengths of the second N-pole magnet and the second S-pole magnet, and / or the radial size of the first tooth pole of the iron core is greater than the radial size of the second tooth pole thereof.
5. The dual-rotor asymmetric disc motor according to claim 3, characterized in that: The axial distances between the first N-pole magnet and the first S-pole magnet and the first tooth pole are set to be smaller than the axial distances between the second N-pole magnet and the second S-pole magnet and the second tooth pole.
6. The dual-rotor asymmetric disc motor according to claim 1, characterized in that: The plurality of first N-pole magnets and first S-pole magnets are alternately arranged along the circumferential direction; The plurality of second N-pole magnets and second S-pole magnets are alternately arranged along the circumferential direction; The multiple groups of first coil windings are arranged on the side of the iron core facing the first rotor assembly and are spaced apart along the circumferential direction, and the multiple groups of second coil windings are arranged on the side of the iron core facing the second rotor assembly and are spaced apart along the circumferential direction.
7. The dual-rotor asymmetric disc motor according to claim 1, characterized in that: The housing assembly comprises a front cover and a shell, and the front cover and the shell are detachably fixedly connected; The front cover is provided with a through hole for the main shaft output end to pass through.
8. The dual-rotor asymmetric disc motor according to claim 7, characterized in that: The bearing assembly includes a first bearing and a second bearing, and an axial distance between the first bearing and the output end of the main shaft is smaller than an axial distance between the second bearing and the output end of the main shaft.
9. The dual-rotor asymmetric disc motor according to claim 8, characterized in that: It also includes a pre-tightening structure, which is elastically abutted between the side of the second bearing facing away from the main shaft output end and the housing.
10. The dual-rotor asymmetric disc motor according to claim 9, characterized in that: It also includes an axial magnetic attraction force stabilization mechanism, which includes a compression spring and a spring retaining ring sleeved on the main shaft; the spring retaining ring is located on the side of the first bearing facing away from the main shaft output end; the compression spring is located between the spring retaining ring and a spring blocking structure fixedly arranged on the main shaft or the first rotor assembly.