Motor rotor assembly and motor

Abstract

The utility model discloses a motor rotor assembly, which comprises a first rotor assembly, a cross coupling and a second rotor assembly, the first rotor assembly and the second rotor assembly are both provided with cross grooves, the cross coupling is arranged between the first rotor assembly and the second rotor assembly, and the cross coupling is connected with the first rotor assembly and the second rotor assembly. The cross coupling is arranged in the cross grooves of the first rotor assembly and the second rotor assembly so as to lock the relative rotation relation of the first rotor assembly and the second rotor assembly; wherein the first rotor assembly and the second rotor assembly are fixedly connected with each other through screws. According to the brand-new motor rotor assembly designed by the utility model, the two rotor assemblies are arranged and matched and linked by using the cross coupling, so that the synchronous movement of the two rotor assemblies of the double-rotor axial magnetic flux motor is realized, and the motor rotor assembly is low in assembly difficulty, good in assembly precision, not easy to wear and simple to disassemble and maintain in the later period; the method has good popularization prospect and application value.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor rotor assembly and a motor. Background Art

[0002] In recent years, with the rapid development of new energy vehicles, technical indicators such as motor efficiency and power density have been continuously improved; among them, the permanent magnet synchronous motor is one of the most widely used motor types in current new energy vehicles, which has the advantages of high efficiency, high power density, high torque and wide speed regulation range.

[0003] The double-rotor axial-flux motor is a special type of permanent magnet synchronous motor. This motor has a unique structure, and its rotor is located on the side of the stator instead of inside the stator, which enables the rotor to have a larger diameter size, so as to obtain a higher torque output under the action of the same force. Compared with the traditional radial-flux motor, the axial-flux motor usually has higher torque density and power density, its structure is more compact, and its weight is lighter, and it has gradually become a new research direction.

[0004] Currently, the structure of the existing double-rotor axial-flux motor is usually relatively complex. Its two rotors are generally connected and positioned to a motor main shaft through flat keys, so that the motor main shaft and the round hole of the rotor are in an interference fit to form a drive component that can rotate integrally. Due to this structural limitation of the motor, operators often need to first install one side rotor on the motor main shaft, then put them together into the stator housing, and then press the other side rotor assembly onto the main shaft and into the stator housing; then press the two side bearings onto the main shaft and assemble the two side end covers to complete the installation.

[0005] It is found through research that the existing double-rotor axial-flux motor has the following disadvantages and deficiencies:

[0006] (1) One main shaft needs to connect two rotors, which requires a longer design size, and the interference fit area between the main shaft and the rotor is large, and the rotor and the main shaft are easily worn during assembly and pressing.

[0007] (2) The flat key grooves of the main shaft and the rotor are long, which is difficult to machine and affects the connection accuracy of the rotor; moreover, once the flat key is long, it will lead to difficult assembly, and once the flat key is short, it will affect the connection strength.

[0008] (3) The operation difficulty of rotor dynamic balance is high, which affects the dynamic balance accuracy.

[0009] (4) The process is complex and the production efficiency is low.

[0010] (5) The rotor is difficult to disassemble, the later maintenance cost is high, the main shaft and the rotor are worn, which affects the secondary assembly accuracy of the motor, or causes the rotor or the main shaft to be scrapped.

[0011] (6) The spindle has a relatively large mass, increasing the moment of inertia and the weight of the motor. Content of the Utility Model

[0012] The technical problem to be solved by the present utility model is to provide a motor rotor assembly and a motor, so as to solve the problems of high assembly difficulty, poor assembly accuracy, easy wear, and difficult disassembly and maintenance in the assembly of the existing motor rotor assembly and the motor spindle.

[0013] To solve the above technical problem, the technical solution adopted by the present utility model is: a motor rotor assembly, which includes: a first rotor assembly, a cross coupling, and a second rotor assembly. Cross grooves are provided on both the first rotor assembly and the second rotor assembly. The cross coupling is arranged between the first rotor assembly and the second rotor assembly, and the cross coupling is arranged in the cross grooves of the first rotor assembly and the second rotor assembly to lock the relative rotation relationship between the first rotor assembly and the second rotor assembly; wherein, the first rotor assembly and the second rotor assembly are fixedly connected to each other by screws.

[0014] In the above technical solution of the present utility model, aiming at the problems of high assembly difficulty, poor assembly accuracy, easy wear, and difficult disassembly and maintenance in the assembly of the two rotors of the existing dual-rotor axial-flux motor and the motor spindle, the present utility model designs a new motor rotor assembly. This motor rotor assembly designs and adopts a cross coupling to drive and connect the first rotor assembly and the second rotor assembly. At this time, the transmission between the two rotor assemblies does not need to be connected by the same spindle. Users can consider the design scheme of a split spindle, set the spindle on the above first rotor assembly and the second rotor assembly respectively, and use the above cross coupling for drive connection, thereby reducing the assembly difficulty, simplifying the assembly process, realizing lossless installation, and facilitating subsequent disassembly and maintenance.

[0015] In addition, based on the above design, since a cross coupling is used to replace the traditional flat key, in actual application, the cross coupling can be correspondingly matched with the cross grooves of the above first rotor assembly and the second rotor assembly. Its machining accuracy is reliable, the fit is precise, and it can achieve good promotion prospects and application value.

[0016] Further, in the motor rotor assembly of the present utility model, the first rotor assembly includes a first spindle and a first rotor, and the second rotor assembly includes a second spindle and a second rotor; wherein, the first rotor is sleeved on one end of the first spindle close to the second rotor assembly, the second rotor is sleeved on one end of the second spindle close to the first rotor assembly, and a preset distance is provided between the first rotor and the second rotor.

[0017] In the above technical solution of the present utility model, the main shaft and the rotor in each rotor assembly do not require press fitting, and wear between the main shaft and the rotor can be avoided. At the same time, due to the design concept of the split main shaft, in each rotor assembly, the integration design of the above-mentioned main shaft and the rotor can ensure relatively high overall manufacturing precision, simple process, good stability in modular production, and high consistency of components.

[0018] Further, in the motor rotor assembly of the present utility model, the first main shaft and the second main shaft both extend in the first direction, and the first rotor and the second rotor are arranged opposite to each other.

[0019] Further, in the motor rotor assembly of the present utility model, through holes are provided in the first main shaft and the second main shaft, and the through holes extend in the first direction and penetrate the first main shaft or the second main shaft.

[0020] In the above technical solution of the present utility model, the reason for providing through holes in the above-mentioned first main shaft and the second main shaft is that: on the premise of ensuring strength, the main shaft can preferably be designed as a hollow shaft to reduce the weight of the main shaft, thereby reducing the moment of inertia of the main shaft and improving strength.

[0021] Further, in the motor rotor assembly of the present utility model, the first rotor and the second rotor both include: a mounting plate, a magnetic conductive ring, a magnet positioning plate, and a plurality of magnet assemblies; a central circular hole is provided in the mounting plate, and the central circular hole extends in the first direction and penetrates the mounting plate; an annular boss is provided on one side surface of the mounting plate, and the annular boss surrounds the central circular hole.

[0022] Wherein, an annular groove is further provided on the side surface, the magnetic conductive ring is arranged in the annular groove, and a plurality of the magnet assemblies are uniformly arranged in the annular groove and are arranged on the magnetic conductive ring; the magnet positioning plate is arranged in the annular groove, and the magnet positioning plate is fixedly connected to the mounting plate to be used for positioning the positions of the plurality of magnet assemblies in the annular groove.

[0023] Further, in the motor rotor assembly of the present utility model, in the first rotor assembly, part of the cross grooves are provided on the end surface of the first main shaft close to the second rotor assembly, and the other part of the cross grooves are provided on the annular boss of the first rotor.

[0024] In the second rotor assembly, part of the cross grooves are provided on the end surface of the second main shaft close to the first rotor assembly, and the other part of the cross grooves are provided on the annular boss of the second rotor.

[0025] Furthermore, in the motor rotor assembly described in the present invention, the magnetic steel positioning plate includes an annular portion and a plurality of locking portions, and a positioning hole is provided on the annular portion for fixed connection with the mounting plate by screws; wherein, one end of the plurality of locking portions is connected to the annular portion, and the other end of the plurality of locking portions extends in a direction away from the annular portion so that the locking portions conflict with the magnetic steel assembly.

[0026] Furthermore, in the motor rotor assembly described in the present invention, a positioning boss is provided on the inner wall of the central circular hole of the first rotor and the second rotor, and a positioning groove for matching the positioning boss is provided at one end of the first main shaft and the second main shaft extending into the central circular hole.

[0027] Correspondingly, another object of the present invention is to design a motor, which includes a main housing, a motor stator assembly and the above-mentioned motor rotor assembly of the present invention, wherein the motor stator assembly and the motor rotor assembly are both arranged in the main housing, and the motor stator assembly is arranged between the first rotor assembly and the second rotor assembly of the motor rotor assembly.

[0028] Furthermore, in the motor rotor assembly described in the present invention, bearings are sleeved on the first main shaft of the first rotor assembly and the second main shaft of the second rotor assembly, and the bearings are accommodated in the main housing.

[0029] The beneficial effect of the present utility model is that a motor rotor assembly is designed, and the motor rotor assembly can use a cross coupling to transmit and connect the first rotor assembly and the second rotor assembly through a reasonable design of its own structure. At this time, the transmission between the two rotor assemblies does not need to be connected by the same main shaft. The user can consider the design of a split main shaft, respectively set the main shaft on the above-mentioned first rotor assembly and the second rotor assembly, and use the above-mentioned cross coupling for transmission connection, thereby reducing the difficulty of assembly, simplifying the difficulty of assembly, and achieving non-destructive installation, so as to facilitate subsequent disassembly and maintenance.

[0030] It can be seen that the utility model realizes the synchronous movement of the two rotor assemblies of the dual-rotor axial flux motor by setting two rotor assemblies and cooperating with a cross coupling for transmission connection. It uses a cross coupling to replace the traditional flat key, thereby ensuring the subsequent processing accuracy and reliability, good matching precision, low processing difficulty, good assembly accuracy and not easy to wear. It has good promotion prospects and application value.

[0031] Correspondingly, the motor of the present invention also adopts the above-mentioned motor rotor assembly of the present invention. The motor is a dual-rotor axial flux motor, which also has the above-mentioned advantages and beneficial effects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic structural diagram of a motor rotor assembly according to one embodiment of the present invention;

[0033] Figure 2 This is a schematic exploded view of the structure of the motor rotor assembly according to one embodiment of the present invention from one viewing angle;

[0034] Figure 3 This is a structural exploded view of the motor rotor assembly according to one embodiment of the present invention from another perspective;

[0035] Figure 4 for Figure 3 A partial enlarged view of the motor rotor assembly shown;

[0036] Figure 5 This is a schematic structural diagram of a first rotor assembly of a motor rotor assembly according to one embodiment of the present invention;

[0037] Figure 6 This is a schematic exploded view of the structure of the first rotor of the motor rotor assembly according to one embodiment of the present invention;

[0038] Figure 7 A schematic structural diagram of a second rotor assembly of the motor rotor assembly according to one embodiment of the present invention;

[0039] Figure 8 This is a schematic exploded view of the structure of the second rotor of the motor rotor assembly according to one embodiment of the present invention;

[0040] Figure 9 This is a front view of the structure of the motor rotor assembly described in one embodiment of the present invention, in which the magnetic steel positioning plate cooperates with multiple magnetic steel assemblies.

[0041] Description of labels:

[0042] 1. First rotor assembly; 101. First main shaft; 102. First rotor;

[0043] 2. Second rotor assembly; 201. Second main shaft; 202. Second rotor;

[0044] 3. Cross coupling;

[0045] 4. Cross groove;

[0046] 5. First screw;

[0047] 6. Second screw;

[0048] 7. Through hole;

[0049] 8. Mounting plate; 801. Central round hole; 802. Annular boss; 803. Annular groove; 804. Positioning boss

[0050] 9. Magnetic conductive ring

[0051] 10. Magnetic steel positioning plate; 1001. Annular part; 1002. Positioning hole; 1003. Locking part

[0052] 11. Magnetic steel assembly

[0053] 12. Positioning groove Specific embodiments

[0054] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the drawings

[0055] The present utility model designs a new motor, which is a dual-rotor axial flux motor. The dual-rotor axial flux motor is composed of a main housing, bearings, a motor stator assembly and a motor rotor assembly. Among them, the above-mentioned motor stator assembly and motor rotor assembly are both arranged in the main housing so that the main shaft of the motor rotor assembly can extend out from the end covers at both ends of the main housing. Bearings are also provided at the end covers on both sides of the main housing. The bearings are arranged in the motor housing and sleeved on the main shaft so that the main shaft can rotate around the axis of the bearings

[0056] Please refer to Figures 1 to 9 As shown, in the present utility model, the above-mentioned motor rotor assembly of the dual-rotor axial flux motor includes: a first rotor assembly 1, a cross coupling 3 and a second rotor assembly 2. Cross grooves 4 are provided on both the first rotor assembly 1 and the second rotor assembly 2. The cross coupling 3 is arranged between the first rotor assembly 1 and the second rotor assembly 2, and the cross coupling 3 is arranged in the cross grooves 4 of the first rotor assembly 1 and the second rotor assembly 2 to lock the relative rotational relationship between the first rotor assembly 1 and the second rotor assembly 2. Among them, the first rotor assembly 1 and the second rotor assembly 2 are fixedly connected to each other by screws. For example, Figure 3 as shown by the first screw 5, which can be used to connect the first rotor assembly 1 and the second rotor assembly 2

[0057] It should be noted that in this embodiment, the above-mentioned motor stator assembly is specifically arranged between the first rotor assembly 1 and the second rotor assembly of the motor rotor assembly. The reason why the above-mentioned motor rotor assembly is designed and uses a cross coupling 3 to drive and connect the first rotor assembly 1 and the second rotor assembly 2 is to ensure that the transmission between the two rotor assemblies does not require the use of the same main shaft for connection, thereby avoiding the use of a main shaft with a longer dimension to reduce the processing difficulty and subsequent installation difficulty

[0058] At this time, the user can consider the design scheme of the split main shaft for application in the motor stator assembly. For example, in this embodiment, as Figure 2 shown, a main shaft and a rotor are respectively arranged on the first rotor assembly 1 and the second rotor assembly 2 of the motor stator assembly, and the cross coupling 3 is used for transmission connection, thereby reducing the assembly difficulty, simplifying the assembly process, achieving lossless installation, and facilitating subsequent disassembly and maintenance.

[0059] In addition, in this embodiment, since the cross coupling 3 is used to replace the traditional flat key, in actual application, the cross coupling 3 can be correspondingly matched with the cross grooves 4 of the first rotor assembly 1 and the second rotor assembly 2. Its machining accuracy is reliable, the fit is precise, and it has good promotion prospects and application value.

[0060] As Figure 2 shown, in this embodiment, the first rotor assembly 1 of the motor rotor assembly designed by the present utility model includes: a first main shaft 101 and a first rotor 102, and the second rotor assembly 2 includes a second main shaft 201 and a second rotor 202. Among them, the first rotor 102 is sleeved on one end of the first main shaft 101 close to the second rotor assembly 2, the second rotor 202 is sleeved on one end of the second main shaft 201 close to the first rotor assembly 1, and a preset distance is provided between the first rotor 102 and the second rotor 202. The reason for setting a preset distance between the first rotor 102 and the second rotor 202 is to ensure that when the motor rotor assembly is subsequently installed in the double-rotor axial-flux motor, the motor stator assembly can be arranged between the preset distances of the first rotor 102 and the second rotor 202.

[0061] Correspondingly, as Figure 1 shown, in this embodiment, the first main shaft 101 and the second main shaft 201 of the motor rotor assembly both extend in the first direction, and the first direction is specifically the direction perpendicular to the horizontal plane where the first rotor 102 and the second rotor 202 are located, that is, the first main shaft 101 is perpendicular to the first rotor 102, the second main shaft 201 is perpendicular to the second rotor 202, and the first rotor 102 and the second rotor 202 are arranged opposite to each other. At this time, in the double-rotor axial-flux motor of this embodiment, when the motor rotor assembly is actually arranged in the main housing, bearings are specifically sleeved on the first main shaft 101 of the first rotor assembly 1 and the second main shaft 201 of the second rotor assembly 2.

[0062] Furthermore, in this embodiment, a through hole 7 is defined in the first spindle 101 and the second spindle 201. The through hole 7 extends along the first direction and penetrates the first spindle 101 or the second spindle 201. In this technical solution of the present invention, the spindle and rotor in each rotor assembly do not require press assembly, ensuring wear-free assembly. Furthermore, the integrated design of the spindle and rotor ensures high overall manufacturing precision, a simple process, stable modular production, and high component consistency.

[0063] In addition, if Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, in this embodiment, the first rotor 102 and the second rotor 202 in the motor rotor assembly designed by the present invention both include: a mounting plate 8, a magnetic ring 9, a magnetic steel positioning plate 10 and a plurality of magnetic steel assemblies 11.

[0064] like Figure 6 and Figure 8 As shown, in this embodiment, a central circular hole 801 is provided on the mounting plate 8 of the first rotor 102 and the second rotor 202, and the central circular hole 801 extends along a first direction and passes through the mounting plate 8, where the first direction is perpendicular to the plate surface of the mounting plate 8; and an annular boss 802 is provided on one side surface of the mounting plate 8, which is arranged around the central circular hole 801 on the mounting plate 8; wherein an annular groove 803 is also provided on the side surface, and the magnetic ring 9 is arranged in the annular groove 803, and a plurality of magnetic steel components 11 are evenly distributed in the annular groove 803 and are arranged on the magnetic ring 9; at the same time, the magnetic steel positioning plate 10 is arranged in the annular groove 803, and the magnetic steel positioning plate 10 is fixedly connected to the mounting plate 8 for positioning the positions of the plurality of magnetic steel components 11 in the annular groove 803.

[0065] It should be noted that, in this embodiment, in order to ensure that the first main shaft 101 can be transmission-connected with the second main shaft 201, the first rotor 102 can be transmission-connected with the second rotor 202; in the motor rotor assembly designed by the present invention, part of the cross groove 4 in the first rotor assembly 1 is opened on the end surface of the first main shaft 101 close to the second rotor assembly 2, and the other part of the cross groove 4 is opened on the annular boss 802 of the first rotor 102 (see Figure 5 Furthermore, in the second rotor assembly 2 of the motor rotor assembly, part of the cross groove 4 is formed on the end surface of the second main shaft 201 close to the first rotor assembly 1, and the other part of the cross groove 4 is formed on the annular boss 802 of the second rotor 202 (see Figure 7 described above).

[0066] Referring to Figure 9 It can be easily seen that in this embodiment, the magnetic steel positioning plate 10 provided on the mounting plate 8 of the above-mentioned first rotor 102 and second rotor 202 specifically includes: an annular portion 1001 and a plurality of locking portions 1003. A positioning hole 1002 is formed in the annular portion 1001 for fixedly connecting with the mounting plate 8 through a second screw 6. One end of each of the plurality of locking portions 1003 is connected to the annular portion 1001, and the other end of each of the plurality of locking portions 1003 extends in a direction away from the annular portion 1001, so that the locking portion 1003 abuts against the magnetic steel assembly 11.

[0067] It should be noted that in this embodiment, the above-mentioned magnetic conductive ring 9 is formed by winding silicon steel strips and then assembled in the annular groove 803 of the mounting plate 8. The magnetic steel assembly 11 has the characteristics of a permanent magnet and is adsorbed on the plane of the magnetic conductive ring 9 by magnetic attraction. As Figure 9 shown, the magnetic steel positioning plate 10 is designed with a stepped shape consistent with the outer shape of the magnetic steel assembly 11, and the magnetic steel assemblies 11 are arranged and installed in sequence. The magnetic steel positioning plate 10 is locked by a second screw to connect the magnetic steel positioning plate 10 with the mounting plate 8 and press the magnetic conductive ring 9 in the annular groove 803 of the mounting plate 8.

[0068] Meanwhile, as Figure 6 、 Figure 8 shown, in this embodiment, a positioning boss 804 is provided on the inner wall of the central circular hole 801 of the first rotor 102 and the second rotor 202. A positioning groove 12 for matching with the positioning boss 804 is provided at one end of the first main shaft 101 and the second main shaft 201 extending into the central circular hole 801.

[0069] It should be pointed out that in this embodiment, the positioning boss 804 provided on the inner wall of the central circular hole 801 of the above-mentioned first rotor 102 and second rotor 202 is a symmetric cylindrical flat positioning structure designed to cooperate with the positioning groove 12 of the main shaft, so as to ensure the positioning connection strength between the rotor and the main shaft and form a rotor assembly.

[0070] Moreover, in actual application, threads convenient for installation and disassembly can also be designed at the other end of the first main shaft 101 away from the first rotor 102 and the other end of the second main shaft 201 away from the second rotor 202. The threads are specifically provided in the through holes 7 of the first main shaft 101 and the second main shaft 201. Meanwhile, in order to facilitate the subsequent sleeving of bearings on the first main shaft 101 and the second main shaft 201, a stepped mating position for connecting with the bearing can also be designed on the first main shaft 101 and the second main shaft 201 (refer to Figure 3 ).

[0071] In this embodiment, the second rotor assembly 2 (equivalent to the rear-end rotor assembly) and the first rotor assembly 1 (equivalent to the output-end rotor assembly) have a symmetrical structure. Except for the second main shaft 201 being different from the first main shaft 101, all other structural components are the same; due to the installation requirements of external equipment, the length of the second main shaft 201 is different from that of the first main shaft 101, and a snap ring installation groove is designed.

[0072] In summary, in this utility model, the working principle of the designed motor rotor assembly applied to a dual-rotor axial-flux motor is as follows: The first rotor assembly 1 and the second rotor assembly 2 are positioned and connected through a cross coupling 3, and are firmly locked with screws to form an integral motor drive rotating component, and dynamic balance correction is carried out. The motor is assembled, and the disassembly and installation operations can be repeated, maintaining stable accuracy, firmness and reliability.

[0073] The specific operation process is as follows: Assemble the first rotor assembly 1 and the second rotor assembly 2 respectively, and place the cross coupling 3 into the cross groove 4 of the corresponding first rotor assembly 1; Align the screw holes of the second rotor assembly 2 that are locked with each other, align and assemble with the cross coupling 3, and lock and fasten the first screw 5; Carry out dynamic balance correction on the entire rotating component; After the correction is completed, disassemble it into 4 parts: the first rotor assembly 1, the second rotor assembly 2, the cross coupling 3, and the first screw 5; Install the first rotor assembly 1 into the main housing; Reverse the direction, place the cross coupling 3 into the cross groove 4 of the corresponding second rotor assembly 2; Align the second rotor assembly 2 with the cross coupling 3 and the screw hole positions, and install it into the main housing; Lock the first screw 5 in accordance with the corresponding positions; Press the bearing into the second main shaft 201; Then install the rear end cover, reverse the direction, press the bearing into the first main shaft 101, and then install the front end cover to complete the motor assembly.

[0074] It can be seen from the above that the designed motor rotor assembly and motor in this utility model have optimized the design of their own transmission components. Specifically, by setting two rotor assemblies to be connected in transmission through a cross coupling 3, the synchronous movement of the two rotor assemblies of the dual-rotor axial-flux motor is realized. It uses a cross coupling 3 to replace the traditional flat key, thereby ensuring reliable subsequent processing accuracy, good matching precision, low processing difficulty, good assembly precision and not easy to wear, and it has good promotion prospects and application value.

[0075] In actual application, the main shaft and the rotor in the motor rotor assembly do not require press fitting, and there is no wear between the main shaft and the rotor. At the same time, the cross coupling 3 is used to replace the flat key, and the symmetrical design of the cross coupling 3 and the cross grooves 4 provided on the main shaft and the rotor is utilized to obtain more reliable machining accuracy and ensure precise fit. At the same time, in this motor rotor assembly, the main shafts and the rotors in the first rotor assembly 1 and the second rotor assembly 2 are integrated, with high overall manufacturing accuracy, simple process, stable modular production, and high component consistency. That is to say, the components in this motor rotor assembly are convenient to disassemble and assemble, have high replaceability, and low later maintenance cost. Its installation is simple and fast, and repeated operation is simple, and lossless installation can be achieved.

[0076] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A motor rotor assembly, characterized in that, Comprising: A first rotor assembly, a cross coupling, and a second rotor assembly. Cross grooves are provided on both the first rotor assembly and the second rotor assembly. The cross coupling is disposed between the first rotor assembly and the second rotor assembly, and the cross coupling is disposed in the cross grooves of the first rotor assembly and the second rotor assembly to lock the relative rotational relationship between the first rotor assembly and the second rotor assembly. Among them, the first rotor assembly and the second rotor assembly are fixedly connected to each other by screws.

2. The motor rotor assembly according to claim 1, wherein The first rotor assembly includes a first main shaft and a first rotor, and the second rotor assembly includes a second main shaft and a second rotor. Among them, the first rotor is sleeved on one end of the first main shaft close to the second rotor assembly, the second rotor is sleeved on one end of the second main shaft close to the first rotor assembly, and a preset distance is provided between the first rotor and the second rotor.

3. The motor rotor assembly according to claim 2, wherein, Both the first main shaft and the second main shaft extend in a first direction, and the first rotor and the second rotor are arranged opposite to each other.

4. The motor rotor assembly according to claim 3, characterized in that, Through holes are provided in the first main shaft and the second main shaft, and the through holes extend in the first direction and penetrate through the first main shaft or the second main shaft.

5. The motor rotor assembly according to claim 3, characterized in that, Both the first rotor and the second rotor include: a mounting plate, a magnetic conductive ring, a magnet positioning plate, and a plurality of magnet assemblies. A central circular hole is provided on the mounting plate, and the central circular hole extends in the first direction and penetrates through the mounting plate. An annular boss is provided on one side surface of the mounting plate, and the annular boss surrounds the central circular hole. Among them, an annular groove is further provided on the side surface, the magnetic conductive ring is disposed in the annular groove, and a plurality of the magnet assemblies are evenly distributed in the annular groove and are disposed on the magnetic conductive ring. The magnet positioning plate is disposed in the annular groove, and the magnet positioning plate is fixedly connected to the mounting plate to be used for positioning the positions of the plurality of magnet assemblies in the annular groove.

6. The motor rotor assembly according to claim 5, wherein, In the first rotor assembly, part of the cross grooves are provided on the end surface of the first main shaft close to the second rotor assembly, and another part of the cross grooves are provided on the annular boss of the first rotor. In the second rotor assembly, part of the cross grooves are provided on the end surface of the second main shaft close to the first rotor assembly, and another part of the cross grooves are provided on the annular boss of the second rotor.

7. The motor rotor assembly according to claim 5, wherein The magnet positioning plate includes an annular portion and a plurality of locking portions. A positioning hole is provided on the annular portion to be fixedly connected to the mounting plate by screws. Among them, one ends of the plurality of locking portions are connected to the annular portion, and the other ends of the plurality of locking portions extend in a direction away from the annular portion so that the locking portions abut against the magnet assemblies.

8. The motor rotor assembly according to claim 3, characterized in that, Positioning bosses are provided on the inner walls of the central circular holes of the first rotor and the second rotor, and positioning grooves for matching with the positioning bosses are provided at one ends of the first main shaft and the second main shaft extending into the central circular holes.

9. A motor, characterized in that, It includes a main housing, a motor stator assembly, and a motor rotor assembly as described in any one of claims 1-8. The motor stator assembly and the motor rotor assembly are both disposed in the main housing, and the motor stator assembly is disposed between a first rotor assembly and a second rotor assembly of the motor rotor assembly.

10. The motor according to claim 9, characterized in that, Bearings are sleeved on a first main shaft of the first rotor assembly and a second main shaft of the second rotor assembly, and the bearings are accommodated in the main housing.

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