Axial motor, power assembly and electric equipment

Abstract

The present application provides an axial motor, a power assembly, and an electric device. The axial motor stator of the axial motor is sleeved on the motor shaft through an inner shaft sleeve. The axial motor stator includes a fixing plate and a plurality of magnetic cores. The plurality of magnetic cores are arranged at intervals in sequence around the inner shaft sleeve. The core end of the magnetic core covers a part of the end face of the core winding part of the magnetic core. The end face of the core winding part not covered by the core end of the magnetic core constitutes a stepped surface. The fixing plate is fixed to the end face of the inner shaft sleeve. The fixing plate includes a receiving groove recessed relative to the end face of the inner shaft sleeve. The receiving groove is provided with a plurality of magnetic core receiving holes. The plurality of magnetic core receiving holes respectively receive the core ends of the plurality of magnetic cores. A part of the surface of the fixing plate facing the core winding part is connected to the stepped surface of each magnetic core. In the present application, the magnetic core is fixed by positioning the stepped surface of the fixing plate and the magnetic core, and a receiving groove is provided to thin the fixing plate and improve the heat dissipation effect of the axial motor stator.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an axial motor, a powertrain, and an electric device. Background Art

[0002] Axial motors have received increasing attention due to their advantages such as compact structure, high efficiency, and high power density. They are particularly suitable for applications in scenarios with high torque density and space constraints, such as electric vehicles, renewable energy systems, and industrial equipment. An axial motor includes a stator and a rotor. The stator includes an iron core and windings wound around the iron core. In order to enhance the fixing performance of the stator and the axial motor, the current solution adds pressure plates to both end faces of the stator to fix the stator. However, adding pressure plates affects the heat dissipation effect, and the magnetic core positioning effect inside the pressure plates is poor. Summary of the Invention

[0003] The present application provides an axial motor, a powertrain, and an electric device.

[0004] In a first aspect, the present application provides an axial motor, including an axial motor stator. The axial motor stator is sleeved on a motor shaft through an inner shaft sleeve. The axial motor stator includes a fixing plate and a plurality of magnetic cores. The plurality of magnetic cores are arranged at intervals in sequence around the inner shaft sleeve. Each magnetic core includes a magnetic core winding portion and a magnetic core end portion located at one end of the magnetic core winding portion along the axial direction of the inner shaft sleeve. The magnetic core end portion covers a part of the end face of the magnetic core winding portion. The end face of the magnetic core winding portion not covered by the magnetic core end portion constitutes a stepped surface. The fixing plate is fixed to the end face of the inner shaft sleeve. The fixing plate includes a receiving groove recessed with respect to the end face of the inner shaft sleeve. The receiving groove is provided with a plurality of magnetic core receiving holes, and the plurality of magnetic core receiving holes respectively receive the magnetic core end portions of the plurality of magnetic cores. A part of the surface of the fixing plate facing the magnetic core winding portion is connected to the stepped surface of each magnetic core.

[0005] In the present application, the magnetic cores are fixed by the fixing plate, and a stepped surface is provided on the magnetic cores, which is beneficial to installing the fixing plate on the stepped surface, facilitating installation and positioning, and can position the magnetic cores in the radial and circumferential directions of the fixing plate, so that the plurality of magnetic cores can be arranged at intervals in a ring shape. A receiving groove is provided in the fixing plate to make the fixing plate thinner, increasing the space between the fixing plate and the end cover of the axial motor, which is beneficial to the installation layout of the axial motor rotor of the axial motor. The design space of the axial motor rotor is large, and it is also beneficial to the heat dissipation of the axial motor.

[0006] In a possible implementation, each of the core receiving holes penetrates through the fixing plate, and the core end portions of each of the cores are respectively inserted into one of the multiple core receiving holes. By making the core receiving holes penetrate through the fixing plate, the core end portions of the cores can pass through the core receiving holes and protrude from the fixing plate, so as to be closer to the axial motor rotor, thereby shortening the axial distance of the air gap, improving the magnetic performance, and further improving the axial motor torque.

[0007] In a possible implementation, the stepped surface is arranged around the core end portion. By arranging the stepped surface around the core end portion, the contact area between the fixing plate and each core is increased, and the fixing effect is improved.

[0008] In a possible implementation, the cross-sectional area of the core end portion is smaller than the cross-sectional area of the core winding portion, wherein the cross-sections of the core end portion and the core winding portion are both vertically intersected with the axis of the inner bushing. Setting the cross-sectional area of the core end portion to be smaller than the cross-sectional area of the core winding portion is beneficial for the core end portion to be inserted into the core receiving hole and is beneficial for processing the stepped surface.

[0009] In a possible implementation, the axial motor stator further includes a plurality of pole shoes, the plurality of pole shoes are located in the receiving groove, each of the plurality of pole shoes is respectively located on the circumferential side of the core end portion of one of the plurality of cores, and two adjacent pole shoes are arranged at intervals.

[0010] In this implementation, the receiving groove is used to receive the pole shoes, so that the pole shoes are arranged opposite to the axial motor rotor. The pole shoes are closer to the air gap than the bottom of the receiving groove in the fixing plate, reducing the axial distance between the pole shoes and the axial rotor and improving the magnetic conduction effect. The pole shoes are used to improve the magnetic conduction effect. Since a stepped surface is provided on the core, the cross-sectional area of the core end portion is smaller than the cross-sectional area of the core winding portion, reducing the magnetic conduction effect of the core end portion. There is a part of the core missing on the side of the stepped surface facing the air gap, and the missing part of the core cannot conduct magnetic lines of force. In this implementation, pole shoes are arranged in the receiving groove to make up for the missing part of the core on the side of the stepped surface facing the air gap, improve the magnetic conduction effect, and further improve the output torque of the axial motor. In this implementation, two adjacent pole shoes are arranged at intervals to prevent the magnetic lines of force in the core from being conducted to the adjacent core, avoiding magnetic line loss, and conducting as many magnetic lines of force as possible to the air gap to increase the magnetic flux entering the air gap.

[0011] In a possible implementation, at least a part of the projection of the pole shoe along the axial direction of the inner bushing on the step surface is located within the step surface. Since a step surface is provided on the circumferential side wall of the magnetic core in order to support and position the fixing plate for the magnetic core, a part of the magnetic core on the side of the step surface facing the axial motor rotor is removed, so that the size of the end portion of the magnetic core is smaller than that of the winding portion of the magnetic core, and the amount of magnetic core at the end of the magnetic core is reduced. Accordingly, in this implementation, at least a part of the projection of the pole shoe coincides with the step surface to make up for the lost part of the magnetic core on the side of the step surface facing the axial motor rotor and improve the magnetic conduction effect.

[0012] In a possible implementation, the pole shoe is annular, and each of the plurality of pole shoes is sleeved on the magnetic core end of a magnetic core. By setting the pole shoe to be annular, the pole shoe can be arranged around the magnetic core end, increasing the amount of pole shoes at the magnetic core end and improving the magnetic conduction effect.

[0013] In a possible implementation, the pole shoe is connected to at least a part of the bottom of the receiving groove, and the projection of the pole shoe along the axial direction of the inner bushing on the bottom of the receiving groove is located within the bottom of the receiving groove. In this implementation, the pole shoe is entirely located within the receiving groove to improve the magnetic conduction performance.

[0014] In a possible implementation, the magnetic core end includes a magnetic core connecting portion and a magnetic core sub-end portion arranged axially along the inner bushing. The magnetic core connecting portion is located between the magnetic core sub-end portion and the magnetic core winding portion. The magnetic core sub-end portion covers a part of the end face of the magnetic core connecting portion. The part of the end face of the magnetic core connecting portion not covered by the magnetic core sub-end portion constitutes a secondary step surface. The pole shoe is connected to at least a part of the secondary step surface and at least a part of the bottom of the receiving groove.

[0015] In this implementation manner, a secondary stepped surface is provided on the circumferential side wall of the magnetic core. Compared with the stepped surface, the secondary stepped surface is closer to the axial motor rotor and the air gap. The surface of the pole shoe facing away from the axial motor rotor is adhesively connected to at least part of the secondary stepped surface and at least part of the bottom of the receiving groove. The secondary stepped surface is closer to the axis of the magnetic core than the stepped surface, or the stepped surface surrounds the outer periphery of the secondary stepped surface. Among them, the secondary stepped surface is used to place the pole shoe. By adhesively connecting the surface of the pole shoe facing away from the axial motor rotor to at least part of the secondary stepped surface and at least part of the bottom of the receiving groove, the pole shoe can be axially relatively fixed to the secondary stepped surface and the bottom of the receiving groove on the fixing plate, and the pole shoe can cover the gap between the secondary stepped surface and the bottom of the receiving groove, improving the structural strength. Due to the provision of the secondary stepped surface, the part of the magnetic core of the secondary stepped surface facing the axial motor rotor is missing. In this implementation manner, the part of the pole shoe adhesively connected to the secondary stepped surface can be used to make up for the missing part of the magnetic core of the secondary stepped surface facing the axial motor rotor, and the part of the pole shoe adhesively connected to the bottom of the receiving groove can be used to make up for the missing part of the magnetic core of the stepped surface facing the axial motor rotor.

[0016] In a possible implementation manner, the secondary stepped surface is arranged around the end of the magnetic core sub. Each of the multiple pole shoes is sleeved on an end of the magnetic core sub and is connected to the secondary stepped surface and part of the bottom of the receiving groove. The pole shoe covers the gap between the receiving groove and the secondary stepped surface. Arranging the secondary stepped surface around the end of the magnetic core sub increases the connection contact area and improves the structural strength.

[0017] In a possible implementation manner, the secondary stepped surface is annular. This increases the contact area between the pole shoe and the secondary stepped surface and improves the reliability.

[0018] In a possible implementation manner, potting glue is filled in the receiving groove, and the potting glue is distributed between the pole shoe and the groove wall of the receiving groove, between the pole shoe and the magnetic core, and between the groove wall of the receiving groove and the magnetic core. After assembling the pole shoe, the magnetic core and the fixing plate, potting glue is filled in the receiving groove. The potting glue fills the gaps between the pole shoe and the groove wall of the receiving groove, between the pole shoe and the magnetic core, and between the groove wall of the receiving groove and the magnetic core. Filling potting glue in the receiving groove improves the fixation between the pole shoe, the magnetic core and the fixing plate, and improves the structural reliability of the axial motor stator. The material of the potting glue can be selected according to needs. For example, potting glue with strong adhesiveness and high temperature resistance can be selected.

[0019] In a possible implementation manner, the fixing plate and the stepped surface are fixed by adhesive glue, and the pole shoe and the secondary stepped surface or the bottom of the receiving groove are fixed by adhesive glue. The material of the adhesive glue can be selected according to needs. For example, adhesive glue with strong adhesiveness and high temperature resistance can be selected.

[0020] In a possible implementation, the axial motor stator further includes two of the fixing plates and a housing; the two fixing plates are respectively located at two ends of the inner bushing along the axial direction of the inner bushing, and the inner circumferential portions of the two fixing plates are hermetically fixed to the two ends of the inner bushing along the axial direction of the inner bushing;

[0021] Two ends of the housing along the axial direction of the housing are respectively hermetically fixed to the outer circumferential portions of the two fixing plates;

[0022] Each of the multiple magnetic cores includes two magnetic core end portions located at two ends of the magnetic core winding portion, and each of the magnetic core end portions is hermetically fixed to the wall of the magnetic core receiving hole in the fixing plate on the same side, so that a sealed cavity is formed between the two fixing plates, the inner bushing, the housing and the multiple magnetic cores, and the sealed cavity is used to receive a cooling liquid.

[0023] In this implementation, a sealed cavity is formed by two fixing plates, an inner bushing, a housing and multiple magnetic cores, and a cooling liquid is injected into the sealed cavity. The cooling liquid is used to cool the coil winding and the magnetic cores to cool down the axial motor stator and improve the efficiency of the axial motor. The cooling liquid can be cooling oil. In this implementation, the sealed cavity reuses the two fixing plates for fixing the magnetic cores, and part of the magnetic cores are located in the sealed cavity, without additional cooling pipes, saving costs; and the magnetic cores and the coil winding are located in the sealed cavity, and the cooling liquid can directly contact the magnetic cores and the coil winding, improving the cooling effect.

[0024] In a possible implementation, an inner ring seal is provided between the inner circumferential portion of each fixing plate and the inner bushing, and the inner ring seal is used to seal the inner circumferential portion of the fixing plate and the inner bushing; an outer ring seal is provided between the outer circumferential portion of each fixing plate and the housing, and the outer ring seal is used to seal the outer circumferential portion of the fixing plate and the housing. The sealing performance of the sealed cavity is improved by the inner ring seal and the outer ring seal.

[0025] In a possible implementation, an adhesive is also coated between the inner circumferential portion of the fixing plate and the inner bushing, and an adhesive is also coated between the outer circumferential portion of the fixing plate and the housing. To improve the sealing effect.

[0026] In a possible implementation, the two fixing plates have the same structure. It is beneficial to processing and forming, and is also beneficial to the two fixing plates being respectively installed at both ends of the magnetic core, facilitating installation.

[0027] In a possible implementation, an inner circumferential stop is provided on the inner circumferential portion of the fixing plate, and a bushing stop is provided at one end of the inner bushing facing the fixing plate, and the inner circumferential stop and the bushing stop are hermetically fixed.

[0028] In a second aspect, the present application provides an axial motor, which includes an axial motor stator sleeved on a motor shaft through an inner shaft sleeve; the axial motor stator includes two fixing plates, a housing, and a plurality of magnetic cores. The plurality of magnetic cores are arranged at intervals around the inner shaft sleeve in sequence. The two fixing plates are sleeved on the inner shaft sleeve. Each fixing plate is provided with a plurality of magnetic core receiving holes penetrating through the fixing plate. Two ends of each magnetic core of the plurality of magnetic cores respectively penetrate through the magnetic core receiving holes of the two fixing plates and are hermetically fixed to the hole walls of the magnetic core receiving holes;

[0029] Both ends of the inner shaft sleeve in the axial direction of the inner shaft sleeve are hermetically fixed to the inner circumferential portions of the two fixing plates respectively, and both ends of the housing in the axial direction of the housing are hermetically fixed to the outer circumferential portions of the two fixing plates respectively, so that a sealed cavity is formed among the two fixing plates, the inner shaft sleeve, the housing, and the plurality of magnetic cores.

[0030] In a third aspect, the present application provides a power assembly, which includes a gearbox and the axial motor as described in any one of the above. The axial motor is in transmission connection with the power input shaft of the gearbox and is used to output power to the power input shaft.

[0031] In a fourth aspect, the present application provides an electric device. The electric device includes a device body and the axial motor as described in any one of the above, and the axial motor is installed on the device body; or the electric device includes a device body and the power assembly as described above, and the power assembly is installed on the device body. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.

[0033] Figure 1 It is a schematic structural diagram of a power assembly provided by an embodiment of the present application;

[0034] Figure 2 It is a schematic structural diagram of an electric device provided by an embodiment of the present application;

[0035] Figure 3 It is an overall schematic diagram of an axial motor provided by an embodiment of the present application;

[0036] Figure 4 It is an exploded view of an axial motor provided by an embodiment of the present application;

[0037] Figure 5 It is a schematic structural diagram of an axial motor stator, a first axial motor rotor, and a second axial motor rotor of an axial motor provided by an embodiment of the present application;

[0038] Figure 6 A schematic structural diagram of an axial motor stator of an axial motor provided in an embodiment of the present application;

[0039] Figure 7 An exploded view of an axial motor stator of an axial motor provided in an embodiment of the present application;

[0040] Figure 8 A schematic diagram of the structure of an axial motor stator after being cut open of an axial motor provided in an embodiment of the present application;

[0041] Figure 9 For this application Figure 8 A partial enlarged view of the middle M part;

[0042] Figure 10 A schematic diagram of the structure of a first fixing plate provided in an embodiment of the present application;

[0043] Figure 11 A schematic diagram of the structure of a magnetic core provided in one embodiment of the present application;

[0044] Figure 12 A schematic diagram of the structure of a magnetic core provided in one embodiment of the present application;

[0045] Figure 13 A schematic diagram of the structure of a magnetic core and a first axial motor rotor provided in an embodiment of the present application;

[0046] Figure 14 A magnetic circuit diagram of a magnetic core, a first pole shoe and a first axial motor rotor provided in an embodiment of the present application;

[0047] Figure 15 A schematic diagram of the structure of a magnetic core, a first pole shoe and a first axial motor rotor provided in an embodiment of the present application;

[0048] Figure 16 A schematic diagram of the structure of a first pole shoe, a magnetic core and a coil winding provided in an embodiment of the present application;

[0049] Figure 17 A schematic diagram of the structure of an axial motor after being cut apart provided in one embodiment of the present application;

[0050] Figure 18 For this application Figure 17 A partial enlarged view of the N part;

[0051] Figure 19 A partial cross-sectional view of an axial motor stator provided in one embodiment of the present application;

[0052] Figure 20 A schematic diagram of the structure of a second fixing plate provided in one embodiment of the present application;

[0053] Figure 21For the present application Figure 18 An enlarged layout view of the P part in this application;

[0054] Figure 22 A schematic structural view of an inner shaft sleeve and a first inner ring seal provided by an embodiment of the present application;

[0055] Figure 23 A schematic structural view of a first stop surface and a first inner shaft boss provided by an embodiment of the present application;

[0056] Figure 24 A schematic structural view of a first stop surface and a first inner shaft boss provided by an embodiment of the present application;

[0057] Figure 25 A schematic structural view of an outer housing and a first outer ring seal provided by an embodiment of the present application;

[0058] Figure 26 A schematic structural view of an axial motor stator provided by an embodiment of the present application. Detailed implementation manners

[0059] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0060] In this article, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0061] In addition, in this article, orientation terms such as "upper" and "lower" are defined relative to the orientation of the structural schematic placement in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they can change accordingly with the change of the orientation where the structure is placed.

[0062] The present application provides an axial motor, which includes an axial motor stator and an inner shaft sleeve. The axial motor stator is sleeved on a motor shaft through the inner shaft sleeve. The axial motor stator includes a fixing plate and a plurality of magnetic cores. The plurality of magnetic cores are arranged at intervals in sequence around the inner shaft sleeve. Each magnetic core includes a magnetic core winding portion and a magnetic core end portion located at one end of the magnetic core winding portion along the axial direction of the inner shaft sleeve. The magnetic core end portion covers a part of the end face of the magnetic core winding portion, and the end face of the magnetic core winding portion not covered by the magnetic core end portion constitutes a stepped surface. The fixing plate is fixed to the end face of the inner shaft sleeve. The fixing plate includes a receiving groove recessed relative to the end face of the inner shaft sleeve. The receiving groove is provided with a plurality of magnetic core receiving holes, and the plurality of magnetic core receiving holes respectively receive the magnetic core end portions of the plurality of magnetic cores. A part of the surface of the fixing plate facing the magnetic core winding portion is connected to the stepped surface of each magnetic core. In the present application, the magnetic cores are fixed by the fixing plate, and a stepped surface is provided on the magnetic cores, which is beneficial to installing the fixing plate on the stepped surface, facilitating installation and positioning, and can position the magnetic cores in the radial and circumferential directions of the fixing plate, so that the plurality of magnetic cores can be arranged at intervals in a ring shape. A receiving groove is provided in the fixing plate to thin the fixing plate, increasing the space between the fixing plate and the end cover of the axial motor, which is beneficial to the installation layout of the axial motor rotor of the axial motor, provides a large design space for the axial motor rotor, and is beneficial to the heat dissipation of the axial motor.

[0063] The axial motor provided by the present application can be applied to a powertrain or an electric device.

[0064] Please refer to Figure 1 , Figure 1 FIG. 10 is a schematic structural diagram of a powertrain 1 provided by an embodiment of the present application. The powertrain 1 includes the axial motor 10 and a transmission 20 as described above. The axial motor 10 is drivingly connected to a power input shaft 21 of the transmission 20 for outputting power to the power input shaft 21. In this embodiment, the transmission 20 and the axial motor 10 in the powertrain 1 can be separate or integrated into one body. Among them, a motor shaft 300 of the axial motor 10 is fixedly connected to the power input shaft 21 of the transmission 20 so that the power of the axial motor 10 is transmitted to the power input shaft 21.

[0065] In a possible implementation manner, a wheel drive shaft (not shown in the figure) is provided in the transmission 20. After receiving the power output by the axial motor 10, the wheel drive shaft provides power to the wheels. In this embodiment, gear components are provided in the transmission 20 to achieve power transmission between the axial motor 10 and the wheel drive shaft.

[0066] In a possible implementation, the powertrain 1 further includes an engine 40 and a generator 30. The engine 40 is drivingly connected to another power input shaft in the transmission 20 for outputting power to the other power input shaft. The generator 30 is drivingly connected to the engine 40 through a gear component in the transmission 20. The power output by the engine 40 is transmitted to the generator 30 through the transmission 20, and the generator 30 generates electricity and is used to store electrical energy in the power battery to charge the power battery. It should be noted that, in Figure 1 the provided powertrain 1 includes an engine 40 and a generator 30. The powertrain 1 is a hybrid system. In some embodiments, the engine 40 and the generator 30 may not be provided, and only the axial motor 10 and the transmission 20 are included. At this time, the powertrain 1 is a pure electric power system.

[0067] In a possible implementation, the powertrain 1 further includes at least one of an MCU, an OBC, a DC-DC, a PDU, and a BCU. Among them, the MCU is a motor controller, and its full English name is Motor Control Unit; the OBC is an on-board charger, and its full English name is On-Board Charger; the DC-DC is a DC converter; the PDU is a power distribution unit, and its full English name is Power Distribution Unit; the BCU is a battery control unit, and its full English name is Battery Control Unit. The powertrain 1 can integrate at least one of the above components as needed.

[0068] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of an electric device 2 provided in an embodiment of the present application. The electric device 2 includes a device body 21 and the axial motor 10 as described above. The axial motor 10 is installed on the device body 21.

[0069] The electric device 2 includes a vehicle, a robot or other forms of driving equipment, wherein the vehicle includes an electric vehicle / electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, etc. In some embodiments, the vehicle includes a passenger car, various special operation vehicles with specific functions, such as an engineering rescue vehicle, a watering truck, a sewage suction truck, a cement mixer truck, a crane truck, a medical vehicle, etc.

[0070] For example, Figure 2 As shown, the electric device 2 is a vehicle, and the electric device 2 also includes a wheel 22, which is mounted on the device body 21, and the axial motor 1 is transmission-connected to the wheel 22 for driving the wheel 22 to drive the vehicle to travel.

[0071] See also Figure 3 and Figure 4 , Figure 3 This is an overall schematic diagram of an axial motor 10 provided in an embodiment of the present application. Figure 4 For this application Figure 1 An exploded diagram of an axial motor 1 is provided. The axial motor 10 includes an axial motor stator 100, an axial motor rotor and a motor shaft 300, wherein the axial motor stator 100 is mounted on the motor shaft 300 and is rotationally connected to the motor shaft 300, and the axial motor rotor is mounted on the motor shaft 300 and is fixedly connected to the motor shaft 300. The axial motor rotor is fixedly connected to the motor shaft 300 so that the motor shaft 300 rotates following the axial motor rotor, and the axial motor stator 100 is rotationally connected to the motor shaft 300 so that the motor shaft 300 can rotate relative to the axial motor stator 100. When the axial motor 1 is working, the axial motor stator 100 is stationary, and the axial motor rotor and the motor shaft 300 rotate synchronously. The output end of the motor shaft 300 is used to drive external components to rotate.

[0072] In this embodiment, the axial motor 10 includes two axial motor rotors. One axial motor rotor is denoted as the first axial motor rotor 200, and the other axial motor rotor is denoted as the second axial motor rotor 400. Both the first axial motor rotor 200 and the second axial motor rotor 400 are mounted on the motor shaft 300 and fixedly connected to the motor shaft 300. The first axial motor rotor 200 and the second axial motor rotor 400 are located on both sides of the axial motor stator 100 along the axial direction of the motor shaft 300. The first axial motor rotor 200 and the second axial motor rotor 400 improve the working efficiency of the axial motor 10.

[0073] Please refer to Figure 5 , Figure 5 FIG. is a schematic structural diagram of the axial motor stator 100, the first axial motor rotor 200, and the second axial motor rotor 400 of the axial motor 10 provided in an embodiment of the present application. In this embodiment, there is a first air gap Q1 between the axial motor stator 100 and the first axial motor rotor 200, and a second air gap Q2 between the axial motor stator 100 and the second axial motor rotor 400. The magnetic force lines L generated by the axial motor stator 100 enter the first air gap Q1 and the second air gap Q2. When alternating current is passed through the armature winding of the axial motor stator 100, the interaction between the generated alternating magnetic flux and the permanent magnetic flux generated by the first axial motor rotor 200 and the second axial motor rotor 400 causes the first axial motor rotor 200 and the second axial motor rotor 400 to rotate relative to the axial motor stator 100.

[0074] In a possible implementation, bearings (not shown in the figure) are provided on the motor shaft 300, and the axial motor stator 100 is sleeved on the motor shaft 300 through the bearings, wherein the axial motor stator 100 is rotatably connected to the motor shaft 300 through the bearings. In an embodiment, a first fixing plate (not shown in the figure) and a second fixing plate (not shown in the figure) are provided on the motor shaft 300. The first fixing plate is used to fixedly connect to the first axial motor rotor 200, and the second fixing plate is used to fixedly connect to the second axial motor rotor 400. Exemplarily, the first fixing plate and the first axial motor rotor 200 can be connected by screws, and the second fixing plate and the second axial motor rotor 400 can be connected by screws.

[0075] In a possible implementation, the motor shaft 300 includes a first motor half shaft and a second motor half shaft, wherein the first motor half shaft and the second motor half shaft are fixedly connected. A first fixing plate is provided on the first motor half shaft, and a bearing and a second fixing plate are provided on the second motor half shaft. In some embodiments, the motor shaft 300 can also be an integral body, and a first fixing plate, a bearing, and a second fixing plate are provided on the motor shaft 300.

[0076] In a possible implementation, the axial motor 10 includes a first axial motor rotor 200 and an axial motor stator 100. In this embodiment, there is only one axial motor rotor.

[0077] In a possible implementation, the axial motor 10 includes a first axial motor rotor 200 and two axial motor stators 100. Along the axial direction of the motor shaft 300, the two axial motor stators 100 are distributed on both sides of the first axial motor rotor 200.

[0078] In a possible implementation, the axial motor 10 includes a plurality of axial motor rotors and a plurality of axial motor stators 100. The axial motor rotors and the axial motor stators 100 are alternately arranged in sequence along the axial direction of the motor shaft 300. Exemplarily, the axial motor 10 includes three axial motor rotors and two axial motor stators 100.

[0079] Please refer to Figure 6 、 Figure 7 、 Figure 8 and Figure 9 , Figure 6 which is a schematic structural diagram of the axial motor stator 100 of the axial motor 10 provided in an embodiment of the present application, Figure 7 which is an exploded view of the axial motor stator 100 of the axial motor 10 provided in an embodiment of the present application, Figure 8 which is a schematic structural diagram of the axial motor stator 100 of the axial motor 10 provided in an embodiment of the present application after being cut open, Figure 9 This is for the present application Figure 8 a partial enlarged view of part M.

[0080] In this embodiment, the axial motor stator 100 includes a fixing plate, a plurality of magnetic cores 120 and an inner shaft sleeve 160 (as Figure 7 shown), the plurality of magnetic cores 120 are arranged at intervals in sequence around the inner shaft sleeve 160 (as Figure 6 shown), the magnetic core 120 includes a magnetic core winding part 123 and a magnetic core end part located at one end of the magnetic core winding part 123 along the axial direction O of the inner shaft sleeve 160 (as Figure 9 shown); the magnetic core end part covers a part of the end face of the magnetic core winding part 123, and the end face of the magnetic core winding part 123 not covered by the magnetic core end part constitutes a stepped surface; the fixing plate is fixed to the end face of the inner shaft sleeve 160, the fixing plate includes a receiving groove recessed relative to the end face of the inner shaft sleeve 160, the receiving groove is provided with a plurality of magnetic core receiving holes, the plurality of magnetic core receiving holes respectively receive the magnetic core end parts of the plurality of magnetic cores, and a part of the surface of the fixing plate facing the magnetic core winding part is connected to the stepped surface of each magnetic core.

[0081] Among them, the axial motor stator 100 is rotatably connected to the motor shaft 300 through the inner shaft sleeve 160. Since the first fixing plate 110 is part of the axial motor stator 100, the first fixing plate 110 is rotatably connected to the motor shaft 300. In this embodiment, the first fixing plate 110 is sleeved on the motor shaft 300 through the inner shaft sleeve 160 and is rotatably connected to the motor shaft 300. The axis of the inner shaft sleeve 160, the axis of the motor shaft 300, and the axes of the axial motor stator 100 and the first axial motor rotor 200 are the same.

[0082] In this embodiment, the axial motor stator 100 includes two fixing plates. One of the fixing plates is denoted as the first fixing plate 110 (as Figure 8 and Figure 9 shown). The receiving groove on the first fixing plate 110 is denoted as the first receiving groove 111. The other fixing plate is denoted as the second fixing plate 150, and the receiving groove on the second fixing plate 150 is denoted as the second receiving groove 151. The magnetic core 120 includes two magnetic core ends at both ends of the magnetic core winding part 123. One of the magnetic core ends is denoted as the first magnetic core end 124, and the other magnetic core end is denoted as the second magnetic core end 127 (as Figure 9 shown).

[0083] In this embodiment, the first magnetic core end 124 covers a partial end face of the magnetic core winding part 123. The end face of the magnetic core winding part 123 not covered by the first magnetic core end 124 constitutes the first step face 121 (as Figure 9 and Figure 12 shown); the first fixing plate 110 is fixed to the end face of the inner shaft sleeve 160. The first fixing plate 110 includes a first receiving groove 111 that is recessed relative to the end face of the inner shaft sleeve 160 (as Figure 10 shown). The first receiving groove 111 is provided with a plurality of first magnetic core receiving holes 112. The plurality of first magnetic core receiving holes 112 respectively receive the first magnetic core ends 124 of the plurality of magnetic cores 120. The partial surface of the first fixing plate 110 facing the magnetic core winding part 123 is connected to the first step face 121 of each magnetic core 120.

[0084] Please refer to Figure 11 and Figure 12 , in this embodiment, the first magnetic core end 124 is located at one end of the magnetic core winding part 123 and covers a partial end face of the magnetic core winding part 123. The peripheral part of the end face of the magnetic core winding part 123 is not covered by the first magnetic core end 124. The end face of this part of the magnetic core winding part 123 is the first step face 121. The first step face 121 is located between the circumferential side wall of the first magnetic core end 124 and the circumferential side wall of the magnetic core winding part 123. The first step face 121 intersects with the axis O of the inner shaft sleeve 160. The circumferential side wall of the magnetic core 120 refers to the side wall surrounding the axis Z of the magnetic core 120 (as Figure 11As shown, the axis Z of the magnetic core 120 is parallel to the axis O of the first fixing plate 110, and the circumferential side wall of the magnetic core 120 is located between the two end faces of the magnetic core 120 along the axis O of the motor shaft 300. Among them, the magnetic core winding part 123 is used for winding the coil winding 140 (as Figure 9 shown). A part of the periphery of one end of the magnetic core 120 can be removed to form the first magnetic core end 124 and the first step surface 121, or the magnetic core 120 with the magnetic core winding part 123, the first magnetic core end 124 and the first step surface 121 can be formed by integral pressing.

[0085] In this embodiment, the first fixing plate 110 is arranged adjacent to the first axial motor rotor 200. The first fixing plate 110 is sleeved on the motor shaft 300 through the inner shaft sleeve 160 and is rotatably connected to the motor shaft 300. Among them, the first fixing plate 110 includes two end faces opposite to each other along the inner shaft sleeve 160. The first fixing plate 110 is located at one end of the inner shaft sleeve 160 and is fixed to the end face of the inner shaft sleeve 160. The end face recessed relative to the end face of the inner shaft sleeve 160 refers to the end face of the first fixing plate 110 facing the first axial motor rotor 200, because only the groove located on the end face of the first fixing plate 110 facing the first axial motor rotor is recessed relative to the end face of the inner shaft sleeve 160. That is to say, the first receiving groove 111 of the first fixing plate 110 recessed relative to the end face of the inner shaft sleeve 160 means that the surface of the first fixing plate 110 facing the first axial motor rotor 200 has the first receiving groove 111 recessed towards the inner shaft sleeve 160.

[0086] Among them, a plurality of first magnetic core receiving holes 112 are provided in the first receiving groove 111. Since a plurality of magnetic cores 120 are arranged at intervals around the inner shaft sleeve 160 in sequence, and the plurality of first magnetic core receiving holes 112 respectively receive the first magnetic core ends 124 of the plurality of magnetic cores 120, this shows that the plurality of first magnetic core receiving holes 112 are also arranged at intervals around the inner shaft sleeve 160 in sequence. Specifically, the plurality of magnetic cores 120 and the plurality of first magnetic core receiving holes 112 are both arranged at intervals along the circumferential direction C of the inner shaft sleeve 160 in sequence. Among them, all the first magnetic core receiving holes 112 can penetrate through the first fixing plate 110, or some of the first magnetic core receiving holes 112 penetrate through the first fixing plate 110, and some of the first magnetic core receiving holes 112 do not penetrate through the first fixing plate 110. At this time, this part of the first magnetic core receiving holes 112 is a groove for receiving and positioning the first magnetic core end 124.

[0087] In the present application, the first fixing plate 110 is used to fix the magnetic core 120. A first stepped surface 121 is provided on the magnetic core 120, which is beneficial to installing the first fixing plate 110 on the first stepped surface 121, facilitating installation and positioning, and can position the magnetic core 120 in the radial direction R and circumferential direction C of the first fixing plate 110, so that multiple magnetic cores 120 can be arranged in a ring at intervals in sequence. A first receiving groove 111 is provided in the first fixing plate 110 to thin the first fixing plate 110, increasing the space between the first fixing plate 110 and the end cover of the axial motor 10, which is beneficial to the installation layout of the axial motor rotor of the axial motor 10. The design space of the axial motor rotor is large, and it is also beneficial to the heat dissipation of the axial motor stator 100.

[0088] In a possible implementation manner, each magnetic core receiving hole penetrates the fixing plate, and the magnetic core end portions of each magnetic core respectively pass through one of the magnetic core receiving holes of multiple magnetic core receiving holes. Specifically, please refer to Figure 10 , Figure 10 which is a schematic structural diagram of the first fixing plate 110 provided by an embodiment of the present application. In this embodiment, each first magnetic core receiving hole 112 penetrates the first fixing plate 110, and the first magnetic core end portions 124 of each magnetic core 120 respectively pass through one of the first magnetic core receiving holes 112 of multiple first magnetic core receiving holes 112. In this embodiment, each first magnetic core receiving hole 112 penetrates the bottom 1111 of the first receiving groove 111 and the surface of the first fixing plate 110 facing away from the first receiving groove 111. The first magnetic core receiving holes 112 are arranged in one-to-one correspondence with the magnetic cores 120 for positioning the magnetic cores 120.

[0089] In this embodiment, the first magnetic core receiving holes 112 are arranged at intervals in sequence along the circumferential direction C of the first fixing plate 110 (as shown in Figure 10 ), that is, there is a part of the bottom 1111 of the first receiving groove 111 between two adjacent first magnetic core receiving holes 112. In this implementation manner, the extending direction of the first magnetic core receiving holes 112 is parallel to the axial direction O of the motor shaft 300. In some implementation manners, the extending direction of the first magnetic core receiving holes 112 is set at an angle with the axial direction O of the motor shaft 300.

[0090] In this embodiment, the hole wall of the first magnetic core receiving hole 112 along the radial direction R of the first fixing plate 110 is spaced from the groove wall of the first receiving groove 111 along the radial direction R of the first fixing plate 110, so that there is a part of the bottom 1111a of the first receiving groove 111 between the first magnetic core receiving hole 112 and the first receiving groove 111 along the radial direction R of the first fixing plate 110 (as shown in Figure 10As shown, the bottom 1111a of the first receiving groove 111 of this part can be used to support the pole shoe or receive the bonding glue. In this embodiment, there is a part of the bottom 1111b of the first receiving groove 111 between the circumferences C of two adjacent first magnetic core receiving holes 112 along the first fixing plate 110, and this part of the bottom 1111b of the first receiving groove 111 can be used to receive the pole shoe or the bonding glue. In some embodiments, the hole wall of the first magnetic core receiving hole 112 along the radial direction R of the first fixing plate 110 is parallel to the groove wall of the first receiving groove 111 along the radial direction R of the first fixing plate 110, that is, along the radial direction R, there is no bottom part between the first magnetic core receiving hole 112 and the first receiving groove 111.

[0091] Among them, the surface of the first fixing plate 110 facing the magnetic core winding part 123 intersects with the axial direction O of the first fixing plate 110. The surface of the first fixing plate 110 facing the magnetic core winding part 123 is also the surface of the first fixing plate 110 facing away from the first axial motor rotor 200. As Figure 10 shown, the surface of the first fixing plate 110 facing the magnetic core winding part 123 is the first fixing surface 1101. The first step surface 121 is attached and connected to a part of the surface of the first fixing plate 110 facing the magnetic core winding part 123, that is, the first step surface 121 is attached and connected to a part of the first fixing surface 1101, which indicates that the first step surface 121 intersects with the axial direction O of the first fixing plate 110 or the axial direction O of the motor shaft 300. The first step surface 121 intersects with the circumferential side wall of the magnetic core 120 or the axial direction O of the first fixing plate 110.

[0092] In a possible implementation, the cross-sectional area of the first magnetic core end 124 is smaller than the cross-sectional area of the magnetic core winding part 123. Among them, the cross-section of the first magnetic core end 124 and the cross-section of the magnetic core winding part 123 are both perpendicular to the axial direction O of the inner bushing 160. As Figure 12 described, S1 represents the area of the cross-section of the first magnetic core end 124, and S2 represents the area of the cross-section of the magnetic core winding part 123. In this embodiment, S1 is smaller than S2.

[0093] In this embodiment, the first core end portion 124 is inserted into the first core receiving hole 112, so that one end of the core 120 facing the first fixing plate 110 protrudes from the first fixing plate 110, and can be closer to the first axial motor rotor 200, so as to shorten the axial distance of the first air gap Q1, improve the magnetic performance, and further improve the torque of the axial motor 10; moreover, inserting one end of the core 120 facing the first fixing plate 110 into the first core receiving hole 112 can make the core 120 positioned on the circumferential side of the inner shaft sleeve 160 along the radial direction R and circumferential direction C of the first fixing plate 110, avoiding the shaking of the core 120 and improving the structural stability. In this embodiment, the surface of the first fixing plate 110 facing the core winding portion 123 is connected to the first step surface 121, so that the first fixing plate 110 can be positioned and fixed with the core 120 along the axial direction O, and the first step surface 121 is beneficial to the installation and positioning of the first fixing plate 110, saving the installation time and simplifying the process.

[0094] In a possible implementation manner, the axial motor stator 100 further includes a plurality of pole shoes. The plurality of pole shoes are located in the receiving groove, and each of the plurality of pole shoes is respectively located on the circumferential side of the core end portion of one of the plurality of cores 120, and two adjacent pole shoes are arranged at intervals. In this embodiment, the pole shoe located in the first receiving groove 111 is the first pole shoe 130 (as Figure 9 shown). Specifically, a plurality of first pole shoes 130 are located in the first receiving groove 111, and each of the plurality of first pole shoes 130 is respectively located on the circumferential side of the first core end portion 124 of one of the plurality of cores 120, and two adjacent first pole shoes 130 are arranged at intervals.

[0095] In this embodiment, the opening of the first receiving groove 111 faces the first axial motor rotor 200 and the first air gap Q1. The first receiving groove 111 is used to receive the first pole shoe 130, so that the first pole shoe 130 is arranged opposite to the first axial motor rotor 200. The first pole shoe 130 is closer to the first air gap Q1 than the bottom 1111 of the first receiving groove 111 in the first fixing plate 110, reducing the axial distance between the first pole shoe 130 and the first axial motor rotor 200 and improving the magnetic conduction effect. The first pole shoe 130 is used to improve the magnetic conduction effect. Since the first step surface 121 is provided on the core 120, the cross-sectional area of the first core end portion 124 is smaller than the cross-sectional area of the core winding portion 123, reducing the magnetic conduction effect of the first core end portion 124. As Figure 13 shown, a part of the core W is missing on the side of the first step surface 121 facing the first air gap Q1, so that the missing part of the core W cannot conduct magnetic lines of force. In this embodiment, the first pole shoe 130 is arranged in the first receiving groove 111 (as Figure 9As shown, to make up for the missing part of the magnetic core W on the side of the first step surface 121 facing the first air gap Q1, improve the magnetic conduction effect, and thus improve the output torque of the axial motor 10. In this embodiment, two adjacent first pole shoes 130 are arranged at intervals to prevent the magnetic force lines L in the magnetic core 120 from being conducted to the adjacent magnetic core 120, avoid the loss of magnetic force lines L, and conduct as many magnetic force lines L as possible into the first air gap Q1 to increase the magnetic flux entering the first air gap Q1.

[0096] In this application, the first fixing plate 110 is used to fix the magnetic core 120. To make the magnetic core 120 closer to the first air gap Q1 and improve the magnetic conduction effect, a plurality of first magnetic core receiving holes 112 are provided on the first fixing plate 110, so that the magnetic core 120 can protrude from the first magnetic core receiving holes 112, eliminating the fixing plate between the magnetic core 120 and the first air gap Q1 and improving the magnetic conduction effect. To improve the installation efficiency, a first step surface 121 is provided on the circumferential side wall of the magnetic core 120, which is beneficial to installing the first fixing plate 110 on the first step surface 121, facilitating installation and positioning, and can position the magnetic core 120 in the radial direction R and circumferential direction C of the first fixing plate 110, so that a plurality of magnetic cores 120 can be arranged in a ring at intervals in sequence. The first pole shoe 130 is arranged in the first receiving groove 111, so that the first pole shoe 130 is closer to the first air gap Q1, and the first pole shoe 130 can make up for the missing part of the magnetic core due to the setting of the first step surface 121, increase the magnetic flux entering the first air gap Q1, and improve the output torque of the axial motor 10.

[0097] In a possible implementation, at least part of the projection of the pole shoe along the axial direction O of the inner bushing 160 on the step surface is located within the step surface. Specifically, in this embodiment, at least part of the projection of the first pole shoe 130 along the axial direction O of the inner bushing 160 on the first step surface 121 is located within the first step surface 121 (as Figure 9 shown). Since the first step surface 121 is provided on the circumferential side wall of the magnetic core 120 to support and position the magnetic core 120 by the first fixing plate 110, a part of the magnetic core 120 on the side of the first step surface 121 facing the first axial motor rotor 200 is removed, so that the size of the first magnetic core end 124 is smaller than the size of the magnetic core winding part 123, reducing the amount of magnetic core at the end of the magnetic core 120. Therefore, in this implementation, the projection of the first pole shoe 130 and the first step surface 121 at least partially overlap to make up for the missing part of the magnetic core on the side of the first step surface 121 facing the first axial motor rotor 200 and improve the magnetic conduction effect.

[0098] Please refer to Figure 14 , Figure 14Magnetic circuit diagram of the magnetic core 120, the first pole shoe 130, and the first axial motor rotor 200 provided by an embodiment of the present application. In a possible implementation, the projection of the first pole shoe 130 on the first step surface 121 along the axial direction O of the first fixing plate 110 coincides with the first step surface 121. To make up for the magnetic conduction effect lost by setting the first step surface 121 and improve the magnetic conduction effect. In this embodiment, the first pole shoe 130 and the first step surface 121 are stacked along the axial direction O, so that the magnetic force lines L transmitted from the first step surface 121 can pass through the first pole shoe 130 more concentratedly and be transmitted to the first air gap Q1, and then interact with the magnetic force lines generated by the first axial motor rotor 200 through the first air gap Q1. If the dimension of the first pole shoe 130 along the radial direction R of the first fixing plate 110 is set to be larger than the dimension of the magnetic core 120 along the radial direction R, such as Figure 15 as shown, so that the first pole shoe 130 covers the outside of the magnetic core 120. At this time, part of the magnetic force lines L will spread to the outer peripheral side of the magnetic core 120, and then the magnetic flux entering the first air gap Q1 will be reduced, affecting the performance of the axial motor 10. In this embodiment, the projection of the first pole shoe 130 on the first step surface 121 along the axial direction O of the first fixing plate 110 coincides with the first step surface 121, which can not only make up for the missing magnetic core part of the first step surface 121 facing the first air gap Q1 side, but also make the magnetic force lines L enter the first air gap Q1 more concentratedly, improving the performance of the axial motor 10.

[0099] In a possible implementation, the step surface is arranged around the end of the magnetic core. Specifically, in this embodiment, the first step surface 121 is arranged around the first magnetic core end 124 (such as Figure 11 as shown). In this embodiment, the cross-section of each magnetic core 120 is fan-shaped, and a plurality of magnetic cores 120 are arranged around the inner bushing 160. The radian of the magnetic core 120 along the circumferential direction C of the first fixing plate 110 can be set as required. The first step surface 121 is arranged around the first magnetic core end 124, so that the contact area between the first fixing plate 110 and each magnetic core 120 is larger, improving the fixing effect.

[0100] In a possible implementation, the pole shoe is annular, and each pole shoe of a plurality of pole shoes is sleeved on the magnetic core end of a magnetic core 120. In this embodiment, the first pole shoe 130 is annular, and each first pole shoe 130 of a plurality of first pole shoes 130 is sleeved on the first magnetic core end 124 of a magnetic core 120 (such as Figure 8 as shown). The first pole shoe 130 is adapted to the shape of the magnetic core 120.

[0101] In some embodiments, the first step surface 121 is distributed on both sides of the first magnetic core end 124 along the radial direction R. Part of the first fixing plate 110 located on both sides of the first magnetic core receiving hole 112 along the radial direction R of the first fixing plate 110 is fixedly attached to the first step surface 121.

[0102] In some embodiments, the first stepped surface 121 is distributed on both sides of the first core end 124 along the circumferential direction C. Part of the first fixing plate 110 located on both sides of the first core receiving hole 112 along the circumferential direction C of the first fixing plate 110 is fixedly attached to the first stepped surface 121.

[0103] In a possible implementation, the core end includes a core connection part and a core sub-end axially arranged along the inner bushing 160. The core connection part is located between the core sub-end and the core winding part. The core sub-end covers a part of the end face of the core connection part. The part of the end face of the core connection part not covered by the core sub-end constitutes a secondary stepped surface. The pole shoe is connected to at least part of the secondary stepped surface and at least part of the bottom of the receiving groove. Please continue to refer to Figure 9 and Figure 11 , in this embodiment, the core connection part and the core sub-end in the first core end 124 are respectively denoted as the first core connection part 1241 and the first core sub-end 1242 (as Figure 11 and Figure 12 shown), and the secondary stepped surface on the first core end 124 is the first secondary stepped surface 122.

[0104] Specifically, the first core end 124 includes a first core connection part 1241 and a first core sub-end 1242 axially arranged along the inner bushing 160 (as Figure 11 shown). The first core connection part 1241 is located between the first core sub-end 1242 and the core winding part 123. The first core sub-end 1242 covers a part of the end face of the first core connection part 1241. The part of the end face of the first core connection part 1241 not covered by the first core sub-end 1242 constitutes the first secondary stepped surface 122. The first pole shoe 130 is connected to at least part of the first secondary stepped surface 122 and at least part of the bottom 1111 of the first receiving groove 111.

[0105] In this embodiment, a first secondary step surface 122 is provided on the circumferential side wall of the magnetic core 120. Compared with the first step surface 121, the first secondary step surface 122 is closer to the first axial motor rotor 200 and the first air gap Q1. The surface of the first pole shoe 130 facing away from the first axial motor rotor 200 is in fitting connection with at least part of the first secondary step surface 122 and at least part of the bottom 1111 of the first receiving groove 111. In this embodiment, the first secondary step surface 122 is closer to the axis of the magnetic core 120 than the first step surface 121, or the first step surface 121 surrounds the outer periphery of the first secondary step surface 122. The first secondary step surface 122 is used to place the first pole shoe 130. In this embodiment, the surface of the first pole shoe 130 facing away from the first axial motor rotor 200 is in fitting connection with at least part of the first secondary step surface 122 and at least part of the bottom 1111 of the first receiving groove 111 (as Figure 9 shown), so that the first pole shoe 130 can be axially O-fixed relative to the first secondary step surface 122 and the bottom 1111 of the first receiving groove 111 on the first fixing plate 110, and the first pole shoe 130 can cover the gap between the first secondary step surface 122 and the bottom 1111 of the first receiving groove 111, improving the structural strength. Due to the provision of the first secondary step surface 122, the magnetic core part of the first secondary step surface 122 facing the first axial motor rotor 200 is missing. In this embodiment, the part of the first pole shoe 130 that is in fitting connection with the first secondary step surface 122 can be used to make up for the missing magnetic core part of the first secondary step surface 122 facing the first axial motor rotor 200, and the part of the first pole shoe 130 that is in fitting connection with the bottom 1111 of the first receiving groove 111 can be used to make up for the missing magnetic core part of the first step surface 121 facing the first axial motor rotor 200.

[0106] In a possible implementation manner, the first secondary step surface 122 is disposed around the first magnetic core sub-end 1242. Each of the plurality of first pole shoes 130 is sleeved on a first magnetic core sub-end 1242 and is connected to the first secondary step surface 122 and a part of the bottom 1111 of the first receiving groove 111. In this embodiment, the first secondary step surface 122 is annular, increasing the contact area between the first pole shoe 130 and the first secondary step surface 122 and improving the reliability.

[0107] Please refer to Figure 16 , Figure 16Schematic diagram of the structure of the first pole shoe 130, magnetic core 120, and coil winding 140 provided by an embodiment of the present application. In this embodiment, the first stepped surface 121 and the first secondary stepped surface 122 are both arranged around the circumferential wall of the magnetic core 120. The first pole shoe 130 is annular, and the first pole shoe 130 is sleeved on one end of the magnetic core 120 facing the first fixing plate 110 to improve the magnetic conduction effect and increase the magnetic flux density entering the first air gap Q1. In this embodiment, the number of magnetic cores 120 is the same as that of the first pole shoes 130, and a first pole shoe 130 is sleeved on one end of each magnetic core 120. In this embodiment, the number of magnetic cores 120 is an even number, and the specific quantity can be set according to needs. For the convenience of processing, the shape of each magnetic core 120 is set to be the same, and the shape and size of each first pole shoe 130 are the same.

[0108] In one implementation manner, some of the first pole shoes 130 are annular, and some of the first pole shoes 130 are not annular.

[0109] In a possible implementation manner, on the radial direction R of the first fixing plate 110, the first pole shoe 130 is located between the first fixing plate 110 and the magnetic core 120 (as Figure 9 shown). This enables the first fixing plate 110, the first pole shoe 130, and the magnetic core 120 to be positioned in the radial direction R of the first fixing plate 110.

[0110] In a possible implementation manner, the first pole shoe 130 is flush with the surface of the first fixing plate 110 on the same side as the first axial motor rotor 200 (as Figure 8 shown). This is to improve the flatness of the axial motor stator 100.

[0111] In a possible implementation, the receiving groove is filled with potting glue, and the potting glue is distributed between the pole shoe and the groove wall of the receiving groove, between the pole shoe and the magnetic core, and between the groove wall of the receiving groove and the magnetic core. Specifically, in this embodiment, the first receiving groove 111 is filled with potting glue (not shown in the figure), and the potting glue is distributed between the first pole shoe 130 and the groove wall of the first receiving groove 111, between the first pole shoe 130 and the magnetic core 120, and between the groove wall of the first receiving groove 111 and the magnetic core 120. The first pole shoe 130, the magnetic core 120 and the first fixing plate 110 are bonded and fixed. After the first pole shoe 130, the magnetic core 120 and the first fixing plate 110 are assembled, the first receiving groove 111 is filled with potting glue, and the potting glue is filled in the gap between the first pole shoe 130 and the groove wall of the first receiving groove 111, the gap between the first pole shoe 130 and the magnetic core 120, and the gap between the groove wall of the first receiving groove 111 and the magnetic core 120. The potting glue is filled in the first receiving groove 111 to improve the fixation between the first pole shoe 130, the magnetic core 120 and the first fixing plate 110, and improve the structural reliability of the axial motor stator 100. The material of the potting glue can be selected according to needs, for example, a potting glue with strong adhesion and high temperature resistance can be selected.

[0112] In one embodiment, the first fixing plate 110 is fixed to the first step surface 121 by adhesive, and the first pole shoe 130 is fixed to the first secondary step surface 122 or the bottom 1111 of the first receiving groove 111 by adhesive. The material of the adhesive can be selected according to needs, for example, an adhesive with strong adhesiveness and high temperature resistance can be selected.

[0113] Please combine Figure 7 , Figure 17 and Figure 18 ,in Figure 17 This is a schematic diagram of the structure of the axial motor 10 provided in an embodiment of the present application after being cut away. Figure 18 for Figure 17Partial enlarged view of the middle N part. In a possible implementation, the axial motor stator 100 further includes two fixing plates and a housing 170; the two fixing plates are respectively located at both ends of the inner shaft sleeve 160 along the axial direction O of the inner shaft sleeve 160, and the inner peripheral portions of the two fixing plates are hermetically fixed to both ends of the inner shaft sleeve 160 along the axial direction O of the inner shaft sleeve 160; both ends of the housing 170 along the axial direction of the housing 170 are hermetically fixed to the outer peripheral portions of the two fixing plates respectively; each of the plurality of magnetic cores 120 includes two magnetic core end portions located at both ends of the magnetic core winding portion 123, and each magnetic core end portion is hermetically fixed to the pore wall of the magnetic core receiving hole in the fixing plate on the same side, so that a sealed cavity is formed between the two fixing plates, the inner shaft sleeve, the housing and the plurality of magnetic cores, and the sealed cavity is used to receive the cooling liquid. In this embodiment, the two fixing plates are respectively denoted as the first fixing plate 110 and the second fixing plate 150, the magnetic core receiving hole in the first fixing plate 110 is denoted as the first magnetic core receiving hole 112, the magnetic core receiving hole in the second fixing plate 150 is denoted as the second magnetic core receiving hole 152, the two magnetic core end portions at both ends of the magnetic core winding portion 123 are respectively denoted as the first magnetic core end portion 124 and the second magnetic core end portion 127, and the stepped surface formed by the end surface of the magnetic core winding portion 123 not covered by the second magnetic core end portion 127 is the second stepped surface 125, wherein the first magnetic core end portion 124 is received in the first magnetic core receiving hole 112, and the second magnetic core end portion 127 is received in the second magnetic core receiving hole 152.

[0114] Specifically, in this embodiment, both ends of the inner shaft sleeve 160 along the axial direction O of the inner shaft sleeve 160 are hermetically fixed to the inner peripheral portions of the first fixing plate 110 and the second fixing plate 150 respectively (as Figure 18 shown), both ends of the housing 170 along the axial direction O of the housing 170 are hermetically fixed to the outer peripheral portions of the first fixing plate 110 and the second fixing plate 150 respectively; the first magnetic core end portion 124 and the second magnetic core end portion 127 respectively pass through the first magnetic core receiving hole 112 and the second magnetic core receiving hole 152 and are hermetically fixed to the pore walls of the first magnetic core receiving hole 112 and the second magnetic core receiving hole 152 respectively, so that a sealed cavity 180 is formed between the first fixing plate 110, the second fixing plate 150, the inner shaft sleeve 160, the housing 170 and the plurality of magnetic cores 120, and the sealed cavity 180 is used to receive the cooling liquid.

[0115] In this embodiment, the inner peripheral portion of the first fixing plate 110 refers to the inner ring portion of the first fixing plate 110 close to the inner shaft sleeve 160, and the outer peripheral portion of the first fixing plate 110 refers to the outer ring portion of the first fixing plate 110 away from the inner shaft sleeve 160; the inner peripheral portion of the second fixing plate 150 refers to the inner ring portion of the second fixing plate 150 close to the inner shaft sleeve 160, and the outer peripheral portion of the second fixing plate 150 refers to the outer ring portion of the second fixing plate 150 away from the inner shaft sleeve 160.

[0116] In this embodiment, a sealed cavity 180 is formed among the first fixing plate 110, the second fixing plate 150, the inner shaft sleeve 160, the outer housing 170 and the plurality of magnetic cores 120. A cooling liquid is injected into the sealed cavity 180. The cooling liquid is used to cool the coil winding 140 and the magnetic cores 120 so as to cool down the axial motor stator 100 and improve the efficiency of the axial motor 10. The cooling liquid can be cooling oil. In this embodiment, the sealed cavity 180 reuses the first fixing plate 110 and the second fixing plate 150 for fixing the magnetic cores 120, and part of the magnetic cores 120 is located in the sealed cavity 180, without additional cooling pipes, saving costs; and the magnetic cores 120 and the coil winding 140 are located in the sealed cavity 180, and the cooling liquid can directly contact the magnetic cores 120 and the coil winding 140, improving the cooling effect.

[0117] In one embodiment, a liquid injection hole (not shown in the figure) and a liquid outlet hole (not shown in the figure) can be formed on the outer housing 170. The cooling liquid is injected into the sealed cavity 180 through the liquid injection hole, and the cooling liquid heated by the coil winding 140 and the magnetic cores 120 is discharged through the liquid outlet hole. The cooling liquid discharged from the liquid outlet hole is cooled by a cooling device outside the axial motor stator 100 and then flows back into the sealed cavity 180 through the liquid injection hole again to achieve a cooling cycle. In some embodiments, a junction box is further provided on the outer housing 170. The lead-out ends of the coil windings 140 outside each magnetic core 120 are connected to the junction box via the sealed cavity 180, and the coil windings 140 are connected to an external controller through the junction box to realize current input and current transformation.

[0118] Please refer to Figure 4 , Figure 9 , Figure 19 and Figure 20 , Figure 19 which is a partial sectional view of the axial motor stator 100, Figure 20 and Figure 19 is a schematic structural view of the second fixing plate 150. In a possible implementation manner, receiving grooves are provided on both fixing plates, and magnetic core receiving holes are provided in each receiving groove. Specifically, in this embodiment, the end portion 127 of the second magnetic core covers a part of the end face of the other end of the magnetic core winding portion 123, and the end face of the magnetic core winding portion 123 not covered by the end portion 127 of the second magnetic core constitutes a second stepped surface 125. The second fixing plate 150 is provided with a second receiving groove 151 recessed with respect to the end face of the inner shaft sleeve 160 (as shown in Figure 20 ), the second receiving groove 151 is provided with a plurality of second magnetic core receiving holes 152, and the plurality of second magnetic core receiving holes 152 respectively receive the end portions 127 of the second magnetic cores of the plurality of magnetic cores 120. The part of the surface of the second fixing plate 150 facing the magnetic core winding portion 123 is connected to the second stepped surface 125 of each magnetic core 120.

[0119] In this embodiment, stepped surfaces are provided at both ends of the magnetic core 120 for fixing to the fixing plates at both ends. Specifically, the first fixing plate 110 is fixedly connected to the first stepped surface 121 on the magnetic core 120 (as Figure 9 shown), and the second fixing plate 150 is fixedly connected to the second stepped surface 125 on the magnetic core 120. The magnetic core 120 is fixed from both ends of the magnetic core 120 along the axis O by the first fixing plate 110 and the second fixing plate 150, enhancing the fixing strength of the first fixing plate 110, the second fixing plate 150, and the magnetic core 120 along the axis O and preventing separation and disengagement along the axis O.

[0120] In this embodiment, the second fixing plate 150 is part of the axial motor stator 100, so the second fixing plate 150 is rotatably connected to the motor shaft 300. In this embodiment, the second fixing plate 150 is sleeved on the motor shaft 300 through the inner shaft sleeve 160 and is rotatably connected to the motor shaft 300.

[0121] In a possible implementation, each second magnetic core receiving hole 152 penetrates the second fixing plate 150, and the second magnetic core end 127 of each magnetic core 120 is respectively inserted into one of the second magnetic core receiving holes 152 among a plurality of second magnetic core receiving holes 152. Among them, the second magnetic core receiving holes 152 are arranged at intervals in sequence along the circumferential direction C of the second fixing plate 150 (as Figure 20 shown), that is, there is a bottom 1511 of a part of the second receiving groove 151 between two adjacent second magnetic core receiving holes 152. In this embodiment, the extending direction of the second magnetic core receiving hole 152 is parallel to the axis O of the inner shaft sleeve 160. In some embodiments, the extending direction of the second magnetic core receiving hole 152 is arranged at an angle with the axis O of the inner shaft sleeve 160. In this embodiment, the first magnetic core receiving hole 112 is arranged opposite to the second magnetic core receiving hole 152, so that both ends of the magnetic core 120 can be smoothly inserted into the first magnetic core receiving hole 112 and the second magnetic core receiving hole 152.

[0122] In this embodiment, the hole wall of the second magnetic core receiving hole 152 along the radial direction R of the second fixing plate 150 is spaced from the groove walls at both ends of the second receiving groove 151 along the radial direction R of the second fixing plate 150, so that the second magnetic core receiving hole 152 and the second receiving groove 151 have a bottom 1511a of a part of the second receiving groove 151 along the radial direction R of the second fixing plate 150 (as Figure 20As shown in the figure, the bottom 1511a of the second receiving groove 151 of this part can be used to support the second pole shoe 190 or receive the bonding glue. In this embodiment, there is a part of the bottom 1511b of the second receiving groove 151 between the circumferences C of two adjacent second magnetic core receiving holes 152 along the second fixing plate 150, and this part of the bottom 1511b of the second receiving groove 151 can be used to receive the second pole shoe 190 or the bonding glue. In some embodiments, the hole wall of the second magnetic core receiving hole 152 along the radial direction R of the second fixing plate 150 is parallel to the side wall of the second receiving groove 151 along the radial direction R of the second fixing plate 150, and there is no bottom 1511 between the second magnetic core receiving hole 152 and the second receiving groove 151 along the radial direction R.

[0123] In this embodiment, along the axis Z direction of the magnetic core 120, the cross-sectional area of the end 127 of the second magnetic core is smaller than the cross-sectional area of the magnetic core winding part 123 (as Figure 12 shown), where the cross-sections of the end 127 of the second magnetic core and the magnetic core winding part 123 are perpendicular to the axis Z of the magnetic core 120.

[0124] In this embodiment, on the axial direction O of the inner bushing 160, the coil winding 140 is located between the first step surface 121 and the second step surface 125 (as Figure 9 shown). After the coil winding 140 is energized with alternating current, the alternating magnetic flux generated passes through the second air gap Q2 between the axial motor stator 100 and the second axial motor rotor 400 and interacts with the magnetic flux generated by the second axial motor rotor 400 to drive the second axial motor rotor 400 to rotate.

[0125] In this embodiment, the end 127 of the second magnetic core is inserted through the second magnetic core receiving hole 152, so that one end of the magnetic core 120 facing the second fixing plate 150 passes through the second fixing plate 150, and can be closer to the second axial motor rotor 400, so as to shorten the axial distance of the second air gap Q2, improve the magnetic performance, and further improve the torque of the axial motor 10; and, inserting the end 127 of the second magnetic core through the second magnetic core receiving hole 152 can make the magnetic core 120 positioned on the circumferential side of the motor shaft 300 along the radial direction R and the circumferential direction C of the second fixing plate 150, avoiding the shaking of the magnetic core 120 and improving the structural stability. In this embodiment, the surface of the second fixing plate 150 facing the magnetic core winding part 123 is attached to the second step surface 125, so that the second fixing plate 150 can be positioned and fixed with the magnetic core 120 along the axial direction O, and the second step surface 125 is beneficial to the installation and positioning of the second fixing plate 150, saving installation time and simplifying the process.

[0126] In this embodiment, the pole shoe located in the second receiving groove 151 is the second pole shoe 190. Each of the plurality of second pole shoes 190 is located on the circumferential side of one of the plurality of magnetic cores 120, and adjacent second pole shoes 190 are arranged at intervals.

[0127] Among them, the opening of the second receiving groove 151 faces the second axial motor rotor 400. The second receiving groove 151 is used to receive the second pole shoe 190, so that the second pole shoe 190 is disposed opposite to the second axial motor rotor 400. The second pole shoe 190 is closer to the second air gap Q2 than the bottom 1511 of the second receiving groove 151 in the second fixing plate 150, reducing the axial distance between the second pole shoe 190 and the first axial motor rotor 200 and improving the magnetic conduction effect. The second pole shoe 190 is used to improve the magnetic conduction effect. Since the second stepped surface 125 is provided on the magnetic core 120, the cross-sectional dimension of the second magnetic core end 127 is smaller than that of the magnetic core winding portion 123, thereby reducing the magnetic conduction effect of the second magnetic core end 127. In this embodiment, the second pole shoe 190 is disposed in the second receiving groove 151 to make up for the part of the magnetic core 120 passing through the second magnetic core receiving hole 152, improve the magnetic conduction effect, and further improve the output torque of the axial motor 10. In this embodiment, the adjacent second pole shoes 190 are arranged at intervals, which can prevent the magnetic force line L in the magnetic core 120 from being conducted to the adjacent magnetic core 120, avoid the loss of the magnetic force line L, and conduct as much magnetic force line L as possible to the second air gap Q2 to increase the magnetic flux entering the second air gap Q2.

[0128] In this embodiment, the second fixing plate 150 is used to fix the magnetic core 120. In order to make the magnetic core 120 closer to the second air gap Q2 and improve the magnetic conduction effect, a plurality of second magnetic core receiving holes 152 are provided in the second fixing plate 150, so that the magnetic core 120 can protrude from the second magnetic core receiving holes 152, eliminating the fixing plate between the magnetic core 120 and the second air gap Q2 and improving the magnetic conduction effect; in order to improve the installation efficiency, a second stepped surface 125 is provided on the circumferential side wall of the magnetic core 120, which is beneficial to installing the second fixing plate 150 on the second stepped surface 125, facilitating installation positioning, and being able to position the magnetic core 120 in the radial direction R and circumferential direction C of the second fixing plate 150, so that the plurality of magnetic cores 120 can be arranged in a ring at intervals in sequence. The second pole shoe 190 is disposed in the second receiving groove 151, so that the second pole shoe 190 is disposed closer to the second air gap Q2, and makes up for the missing part of the magnetic core due to the setting of the second stepped surface 125, increasing the magnetic flux entering the second air gap Q2 and improving the output torque of the axial motor 10.

[0129] In a possible implementation, the second fixing plate 150 has the same structure and dimensions as the first fixing plate 110. Specifically, the first receiving groove 111 and the second receiving groove 151 have the same structural dimensions, and the first magnetic core receiving hole 112 and the second magnetic core receiving hole 152 have the same structural dimensions. In some embodiments, there may be a slight difference in the structure and dimensions between the second fixing plate 150 and the first fixing plate 110.

[0130] In a possible implementation, at least a part of the projection of the second pole shoe 190 along the axial direction O of the inner bushing 160 on the second step surface 125 is located within the second step surface 125. Since in order to be able to fix and position the magnetic core 120 with the second fixing plate 150, the second step surface 125 is provided on the circumferential side wall of the magnetic core 120, a part of the magnetic core 120 on the side of the second step surface 125 facing the second axial motor rotor 400 is removed, so that the end dimension of the magnetic core 120 facing the second axial motor rotor 400 is smaller than the dimension of the middle part of the magnetic core 120 where the coil winding 140 is wound, resulting in a reduction in the magnetic core amount at the end of the magnetic core 120. Accordingly, in this implementation, at least a part of the projection of the first pole shoe on the second step surface 125 coincides to make up for the part of the magnetic core lost on the side of the second step surface 125 facing the second axial motor rotor 400 and improve the magnetic conduction effect.

[0131] In a possible implementation, the projection of the second pole shoe 190 along the axial direction O of the inner bushing 160 on the second step surface 125 coincides with the second step surface 125. To make up for the magnetic conduction effect lost due to the setting of the second step surface 125, improve the magnetic conduction effect, avoid magnetic loss, increase the air-gap magnetic density, and thus improve the performance of the axial motor 10.

[0132] In a possible implementation, the second step surface 125 is arranged around the second magnetic core end 127. In this embodiment, the cross-section of each magnetic core 120 is fan-shaped, and a plurality of magnetic cores 120 are arranged around the motor shaft 300 to form a circular magnetic core structure, where the radian of the magnetic core 120 along the circumferential direction C of the second fixing plate 150 can be set as required. The second step surface 125 is arranged around the circumferential side wall of the magnetic core 120, so that the contact area between the second fixing plate 150 and each magnetic core 120 is larger, improving the fixing effect.

[0133] In some embodiments, the second step surface 125 is distributed on both sides of the magnetic core 120 along the radial direction R. The part of the second fixing plate 150 located on both sides of the second magnetic core receiving hole 152 along the radial direction R of the second fixing plate 150 is fixedly attached to the second step surface 125.

[0134] In some embodiments, the second step surface 125 is distributed on both sides of the magnetic core 120 along the circumferential direction C. The part of the second fixing plate 150 located on both sides of the second magnetic core receiving hole 152 along the circumferential direction C of the second fixing plate 150 is fixedly attached to the second step surface 125.

[0135] In a possible implementation, the second core end 127 includes a second core connection part 1271 and a second core sub-end 1272 arranged axially along the inner bushing 160 (as Figure 12 shown). The second core connection part 1271 is located between the second core sub-end 1272 and the core winding part 123. The second core sub-end 1272 covers a partial end face of the second core connection part 1271. The partial end face of the second core connection part 1271 not covered by the second core sub-end 1272 forms a second secondary step face 126. The second pole shoe 190 is connected to at least part of the second secondary step face 126 and at least part of the bottom 1511 of the second receiving groove 151.

[0136] Among them, compared with the second step face 125, the second secondary step face 126 is closer to the second axial motor rotor 400 (as Figure 19 shown). The surface of the second pole shoe 190 facing away from the second axial motor rotor 400 is in fitting connection with at least part of the second secondary step face 126 and at least part of the bottom 1511 of the second receiving groove 151. In this embodiment, the second secondary step face 126 is closer to the axis of the core 120 than the second step face 125, or the second step face 125 surrounds the outer periphery of the second secondary step face 126. Among them, the second secondary step face 126 is used to place the second pole shoe 190. In this embodiment, the surface of the second pole shoe 190 facing away from the second axial motor rotor 400 is in fit with at least part of the second secondary step face 126 and at least part of the bottom 1511 of the second receiving groove 151, so that the second pole shoe 190 can be relatively fixed axially O of the second fixing plate 150 with the second secondary step face 126 and the bottom 1511 of the second receiving groove 151, and the second pole shoe 190 can cover the gap between the second secondary step face 126 and the bottom 1511 of the second receiving groove 151, improving the structural strength. Due to the provision of the second secondary step face 126, the core part of the second secondary step face 126 facing the second axial motor rotor 400 is missing. In this embodiment, the part of the second pole shoe 190 in contact with the second secondary step face 126 can be used to make up for the missing core part of the second secondary step face 126 facing the second axial motor rotor 400, and the part of the second pole shoe 190 in contact with the bottom 1511 of the second receiving groove 151 can be used to make up for the missing core part of the second step face 125 facing the second axial motor rotor 400.

[0137] In a possible implementation, the second secondary step surface 126 is disposed around the second core end portion 127. Each of the plurality of second pole shoes 190 is sleeved on one end of the core 120 facing the second fixing plate 150 and is in contact with the second secondary step surface 126 and a part of the bottom surface 1511 of the second receiving groove 151. In this embodiment, the second secondary step surface 126 is annular, which increases the contact area between the second pole shoe 190 and the second secondary step surface 126 and improves the reliability.

[0138] In one embodiment, the second pole shoe 190 is annular. Each of the plurality of second pole shoes 190 is sleeved on the second core end portion 127 of one core 120 to improve the magnetic conduction effect and increase the magnetic flux density entering the air gap Q. In one embodiment, some of the second pole shoes 190 are annular and some are not.

[0139] In a possible implementation, in the radial direction R of the second fixing plate 150, the second pole shoe 190 is located between the second fixing plate 150 and the core 120 (as Figure 19 shown). This positions the second fixing plate 150, the second pole shoe 190, and the core 120 in the radial direction R of the second fixing plate 150.

[0140] In a possible implementation, the second pole shoe 190 is flush with the surface of the second fixing plate 150 on the same side as the second axial motor rotor 400. This improves the flatness of the axial motor stator 100.

[0141] In a possible implementation, the second receiving groove 151 is filled with potting glue (not shown in the figure). The potting glue is distributed between the second pole shoe 190 and the groove wall of the second receiving groove 151, between the second pole shoe 190 and the core 120, and between the groove wall of the second receiving groove 151 and the core 120. This bonds and fixes the second pole shoe 190, the core 120, and the second fixing plate 150. After assembling the second pole shoe 190, the core 120, and the second fixing plate 150, potting glue is filled into the second receiving groove 151. The potting glue fills the gaps between the second pole shoe 190 and the groove wall of the second receiving groove 151 and between the second pole shoe 190 and the core 120. Filling the second receiving groove 151 with potting glue improves the fixation between the second pole shoe 190, the core 120, and the second fixing plate 150 and enhances the structural reliability of the axial motor stator 100. The material of the potting glue can be selected according to needs. For example, potting glue with strong adhesiveness and high temperature resistance can be selected.

[0142] In one embodiment, the first fixing plate 110, the core 120, the first pole shoe 130, the second pole shoe 190, and the second fixing plate 150 are bonded and fixed as a whole by adhesive to improve the structural strength of the axial motor stator 100.

[0143] In one embodiment, the second fixing plate 150 and the second step surface 125 are fixed by an adhesive, and the second pole shoe 190 and the second secondary step surface 126 or the bottom 1511 of the second receiving groove 151 are fixed by an adhesive. The material of the adhesive can be selected according to needs. For example, an adhesive with strong adhesiveness and high temperature resistance can be selected.

[0144] In this embodiment, the second secondary step surface 126 is disposed at the end 127 of the second magnetic core. A part of the periphery of the other end of the magnetic core 120 can be removed to form the second magnetic core end 127, the second step surface 125, and the second secondary step surface 126. Alternatively, the magnetic core 120 having the magnetic core winding portion 123, the first magnetic core end 124, the first step surface 121, the first secondary step surface 122, the second magnetic core end 127, the second step surface 125, and the second secondary step surface 126 can be integrally formed by pressing. In some embodiments, the magnetic core winding portion 123, the first magnetic core end 124, and the second magnetic core end 127 are of an integrated structure and can be formed by integral pressing.

[0145] In a possible implementation, the materials of the magnetic core 120, the first pole shoe 130, and the second pole shoe 190 are SMC or iron cores. The full name of SMC is soft magnetic composite, and the Chinese name is soft magnetic composite material. A soft magnetic composite material is a soft magnetic material formed by uniformly dispersing magnetic particles in a non-magnetic substance. SMC has good magnetic conductivity and can provide a path for magnetic lines of force. In some embodiments, the material of the magnetic core 120 is ferrite or nanocrystalline.

[0146] In one embodiment, the numbers of the first pole shoe 130, the second pole shoe 190, and the magnetic core 120 are the same, and the first pole shoe 130 and the second pole shoe 190 are respectively sleeved at both ends of each magnetic core 120. In some embodiments, when the axial motor 10 has only the first axial motor rotor 200, only the first pole shoe 130 can be provided and the second pole shoe 190 is not provided. In some embodiments, when the axial motor 10 has only the first axial motor rotor 200, the first receiving groove 111 and the first magnetic core receiving hole 112 can be provided on the first fixing plate 110, and the second magnetic core receiving hole 152 is not provided in the second fixing plate 150.

[0147] In one embodiment, the materials of the first fixing plate 110 and the second fixing plate 150 are formed by carbon fiber, thermoplastic, or thermosetting plastic. In this embodiment, the first fixing plate 110 and the second fixing plate 150 are formed by carbon fiber machining, and the first receiving groove 111 and the second receiving groove 151 with a "U" - shaped cross - section are formed on the first fixing plate 110 and the second fixing plate 150.

[0148] Please continue to refer toFigure 18 In a possible implementation, an inner ring seal is provided between the inner peripheral portion of each fixing plate and the inner shaft sleeve 160. The inner ring seal is used to seal the inner peripheral portion of the fixing plate and the inner shaft sleeve. An outer ring seal is provided between the outer peripheral portion of each fixing plate and the outer housing 170. The outer ring seal is used to seal the outer peripheral portion of the fixing plate and the outer housing.

[0149] Specifically, in this embodiment, the inner ring seal between the inner peripheral portion of the first fixing plate 110 and the inner shaft sleeve 160 is denoted as the first inner ring seal 101. The first inner ring seal 101 is used to seal the inner peripheral portion of the first fixing plate 110 and the inner shaft sleeve 160. The inner ring seal between the inner peripheral portion of the second fixing plate 150 and the inner shaft sleeve 160 is denoted as the second inner ring seal 102. The second inner ring seal 102 is used to seal the inner peripheral portion of the second fixing plate 150 and the inner shaft sleeve 160. The outer ring seal between the outer peripheral portion of the first fixing plate 110 and the outer housing 170 is denoted as the first outer ring seal 103. The first outer ring seal 103 is used to seal the outer peripheral portion of the first fixing plate 110 and the outer housing 170. The outer ring seal between the outer peripheral portion of the second fixing plate 150 and the outer housing 170 is denoted as the second outer ring seal 104. The second outer ring seal 104 is used to seal the outer peripheral portion of the second fixing plate 150 and the outer housing 170.

[0150] The first inner ring seal 101, the second inner ring seal 102, the first outer ring seal 103, and the second outer ring seal 104 are O-ring seals, sealants, or gaskets, and the material can be rubber. In this embodiment, the first inner ring seal 101 and the second inner ring seal 102, the first outer ring seal 103 and the second outer ring seal 104 are O-ring seals.

[0151] In some embodiments, an adhesive is also coated between the inner peripheral portion of the first fixing plate 110 and the inner shaft sleeve 160, an adhesive is also coated between the inner peripheral portion of the second fixing plate 150 and the inner shaft sleeve 160, an adhesive is also coated between the outer peripheral portion of the first fixing plate 110 and the outer housing 170, and an adhesive is also coated between the outer peripheral portion of the second fixing plate 150 and the outer housing 170 to improve the sealing effect.

[0152] Please continue to refer to Figure 18 In a possible implementation, an inner peripheral stop is provided on the inner peripheral portion of the fixing plate, and a shaft sleeve stop is provided at one end of the inner shaft sleeve facing the fixing plate. The inner peripheral stop and the shaft sleeve stop are sealingly fitted. Specifically, in this embodiment, the inner peripheral stop on the inner peripheral portion of the first fixing plate 110 is denoted as the first inner peripheral stop 113, and the shaft sleeve stop at one end of the inner shaft sleeve 160 facing the first fixing plate 110 is denoted as the first shaft sleeve stop 161. The first inner peripheral stop 113 and the first shaft sleeve stop 161 are sealingly fitted.

[0153] In this embodiment, the first inner peripheral stop 113 is an inner stop, and the first bushing stop 161 is an outer stop. The outer stop is farther from the axis of the motor shaft 300 than the inner stop. The inner stop and the outer stop are cooperatively pressed, and the first inner ring seal 101 is located between the first inner peripheral stop 113 and the first bushing stop 161 to seal the gap between the first inner peripheral stop 113 and the first bushing stop 161.

[0154] Please refer to Figure 21 and Figure 22 , Figure 21 is Figure 18 an enlarged layout view of part P in Figure 22 and is a schematic structural view of the inner bushing 160 and the first inner ring seal 101. Among them, a first fixing boss 1131 protruding towards the inner bushing 160 is provided in a region where the inner peripheral portion of the first fixing plate 110 approaches the motor shaft 300 along the radial direction R of the first fixing plate 110. The inner peripheral portion of the first fixing plate 110 has a first stop surface 1132 away from the first axial motor rotor 200 along the axial direction O. The first fixing boss 1131 is arranged closer to the motor shaft 300 than the first stop surface 1132. The first stop surface 1132 and the first fixing boss 1131 constitute the first inner peripheral stop 113.

[0155] The end of the inner bushing 160 close to the first axial motor rotor 200 has a first stop end surface 1611. One end of the inner bushing 160 close to the first axial motor rotor 200 is provided with a first inner shaft boss 1612 protruding from the first stop end surface 1611 towards the first fixing plate 110. On the radial direction R of the inner bushing 160, the first inner shaft boss 1612 is located at the outer peripheral edge of the inner bushing 160. The first inner shaft boss 1612 and the first stop end surface 1611 constitute the first bushing stop 161. When the first inner peripheral stop 113 and the first bushing stop 161 are cooperatively pressed, the first fixing boss 1131 is in contact with the first stop end surface 1611, and the first stop surface 1132 is in contact with the first inner shaft boss 1612.

[0156] In this embodiment, the first inner ring seal 101 is located between the first fixing boss 1131 and the first stop end surface 1611 to seal between the first fixing boss 1131 and the first stop end surface 1611 and prevent the cooling liquid in the sealing cavity 180 from leaking. In this embodiment, a sealing groove 1613 (as shown in Figure 22 ) is provided on the first stop end surface 1611, and the first inner ring seal 101 is located in the sealing groove 1613. In some embodiments, the first inner ring seal 101 can also be located between the first stop surface 1132 and the first inner shaft boss 1612 (as shown in Figure 23 ), or located between the opposite surfaces of the first fixing boss 1131 and the first inner shaft boss 1612 along the radial direction R (as shown in Figure 24 ).

[0157] In some embodiments, the first inner peripheral stop 113 is an external stop, and the first bushing stop 161 is an internal stop. The external stop is farther from the axis of the motor shaft 300 than the internal stop. The first inner peripheral stop 113 and the first bushing stop 161 cooperate to achieve fixation and sealing.

[0158] In some embodiments, the inner peripheral portion of the first fixing plate 110 and one end of the inner bushing 160 facing the first fixing plate 110 are fixed by screws 201 (as Figure 7 shown), and the first fixing plate 110 and the inner bushing 160 are fixed and locked by the screws 201. In some embodiments, the first fixing plate 110 and the inner bushing 160 can be axially fixed on the inner bushing 160 through a snap ring groove.

[0159] Please continue to refer to Figure 18 , in a possible implementation, the inner peripheral stop of the inner peripheral portion of the second fixing plate 150 is denoted as the second inner peripheral stop 153, and the bushing stop at one end of the inner bushing 160 facing the second fixing plate 150 is denoted as the second bushing stop 162. The second inner peripheral stop 153 and the second bushing stop 162 are in sealing fit. In this embodiment, the second inner peripheral stop 153 is an internal stop, and the second bushing stop 162 is an external stop. The external stop is farther from the motor shaft 300 than the internal stop. In some embodiments, the structures of the second inner peripheral stop 153 and the second bushing stop 162 are the same as those of the first inner peripheral stop 113 and the first bushing stop 161, and reference can be made to the foregoing for understanding.

[0160] In some embodiments, the second inner peripheral stop 153 is an external stop, and the second bushing stop 162 is an internal stop.

[0161] In this embodiment, the second inner ring seal 102 is located between the second inner peripheral stop 153 and the second bushing stop 162 to achieve sealing. Among them, the position where the second inner ring seal 102 is located between the second inner peripheral stop 153 and the second bushing stop 162 can be the same as the position where the first inner ring seal 101 is located between the first inner peripheral stop 113 and the first bushing stop 161.

[0162] In some embodiments, the inner peripheral portion of the second fixing plate 150 and one end of the inner bushing 160 facing the second fixing plate 150 are fixed by screws, and the second fixing plate 150 and the inner bushing 160 are fixed and locked by the screws. In some embodiments, the second fixing plate 150 and the inner bushing 160 can be axially fixed on the motor shaft 300 through a snap ring groove.

[0163] Please refer to Figure 18 and Figure 25 , Figure 25Schematic diagram of the structure of the outer housing 170 and the first outer ring seal 103. In a possible implementation, the outer housing 170 is provided with a first housing shoulder 171 and a second housing shoulder 172 at both ends along the axis O of the outer housing 170 (as Figure 25 shown), the axial motor 10 further includes a first end cover 600 and a second end cover 700 (as Figure 17 shown), the first end cover 600 and the second end cover 700 are respectively located at both ends of the axial motor stator 100 along the axis O of the motor shaft 300, and the first end cover 600 presses the first fixing plate 110 against the first housing shoulder 171 (as Figure 18 shown), and the second end cover 700 presses the second fixing plate 150 against the second housing shoulder 172. The first end cover 600 and the second end cover 700 press the first fixing plate 110 and the second fixing plate 150 against both sides of the outer housing 170 respectively from both sides of the axial motor stator 100, and the first end cover 600, the second end cover 700 and the outer housing 170 are fixedly locked by screws, so that the first fixing plate 110 and the second fixing plate 150 are hermetically fixed to the outer housing 170, improving the structural reliability of the axial motor stator 100.

[0164] In this embodiment, the first axial motor rotor 200 is located between the axial motor stator 100 and the first end cover 600, and the second axial motor rotor 400 is located between the axial motor stator 100 and the second end cover 700.

[0165] In this embodiment, the first outer ring seal 103 is located between the first fixing plate 110 and the first housing shoulder 171 (as Figure 18 shown) to seal the gap between the first fixing plate 110 and the first housing shoulder 171, and the second outer ring seal 104 is located between the second fixing plate 150 and the second housing shoulder 172 to seal the gap between the second fixing plate 150 and the second housing shoulder 172, improving the sealing performance of the sealing cavity 180.

[0166] In this embodiment, the first outer ring seal 103 seals the gap between the outer peripheral portion of the first fixing plate 110 and the outer housing 170, the first inner ring seal 101 seals the gap between the inner peripheral portion of the first fixing plate 110 and the inner shaft sleeve 160, and the gap between the magnetic core 120 and the pore wall of the first magnetic core receiving hole 112 of the first fixing plate 110 is sealed by an adhesive; the second outer ring seal 104 seals the gap between the outer peripheral portion of the second fixing plate 150 and the outer housing 170, the second inner ring seal 102 seals the gap between the inner peripheral portion of the second fixing plate 150 and the inner shaft sleeve 160, and the gap between the magnetic core 120 and the pore wall of the second magnetic core receiving hole 152 of the second fixing plate 150 is sealed by an adhesive, so that the first fixing plate 110, the second fixing plate 150, the inner shaft sleeve 160, the outer housing 170 and the magnetic core 120 form a closed sealed cavity 180.

[0167] Please refer to Figure 26 , Figure 26 FIG. is a schematic structural diagram of an axial motor stator 100 provided by an embodiment of the present application. Different from the first embodiment, in a possible implementation, at least part of the bottom of the pole shoe is connected to the bottom of the receiving groove, and the projection of the pole shoe along the axial direction of the inner shaft sleeve on the bottom of the receiving groove is located within the bottom of the receiving groove. Specifically, in this embodiment, the surface of the first pole shoe 130 facing away from the first axial motor rotor 200 is connected to at least part of the bottom 1111 of the first receiving groove 111, and the projection of the first pole shoe 130 along the axial direction O of the inner shaft sleeve 160 on the bottom 1111 of the first receiving groove 111 is located within the bottom 1111 of the first receiving groove 111. In this embodiment, the first secondary step surface 122 is not provided, and the first pole shoe 130 is entirely located within the first receiving groove 111 to improve the magnetic conductivity.

[0168] In a possible implementation, the projection of the first pole shoe 130 along the axial direction O of the first fixing plate 110 on the first step surface 121 is located within the first step surface 121 to compensate for part of the magnetic core on the side of the first step surface 121 facing the first axial motor rotor 200 and improve the magnetic conductivity.

[0169] In a possible implementation, the surface of the second pole shoe 190 facing away from the second axial motor rotor 400 is attached to at least part of the bottom 1511 of the second receiving groove 151, and the projection of the second pole shoe 190 along the axial direction O of the second fixing plate 150 on the bottom 1511 of the second receiving groove 151 is located within the bottom 1511 of the second receiving groove 151.

[0170] In a possible implementation, the projection of the second pole shoe 190 along the axis O of the second fixing plate 150 on the second step surface 125 is located within the second step surface 125 to compensate for a part of the magnetic core on the side of the second step surface 125 facing the second axial motor rotor 400, thereby improving the magnetic permeability. In this embodiment, the second secondary step surface 126 is not provided, and the second pole shoe 190 is entirely located within the second receiving groove 151 for improving the magnetic permeability.

[0171] Please continue to refer to Figure 18 , an embodiment of the present application provides an axial motor 10. The axial motor 10 includes an axial motor stator 100. The axial motor stator 100 is sleeved on the motor shaft 300 through an inner shaft sleeve 160. The axial motor stator 100 includes two fixing plates 110, 150, an inner shaft sleeve 160, a housing 170, and a plurality of magnetic cores 120. The plurality of magnetic cores 120 are arranged at intervals around the inner shaft sleeve 160 in sequence. The two fixing plates 110, 150 are sleeved on the inner shaft sleeve 160. Each of the fixing plates 110, 150 is provided with a plurality of magnetic core receiving holes 112, 152 penetrating through the fixing plates 110, 150. Both ends of each of the plurality of magnetic cores 120 are respectively inserted into the magnetic core receiving holes 112, 152 of the two fixing plates 110, 150 and are hermetically fixed to the hole walls of the magnetic core receiving holes 112, 152. Both ends of the inner shaft sleeve 160 along the axis O of the inner shaft sleeve 160 are hermetically fixed to the inner circumferential portions of the two fixing plates 110, 150 respectively. Both ends of the housing 170 along the axis O of the housing 170 are hermetically fixed to the outer circumferential portions of the two fixing plates 110, 150 respectively, so that a sealed cavity 180 is formed among the two fixing plates 110, 150, the inner shaft sleeve 160, the housing 170, and the plurality of magnetic cores 120.

[0172] In this embodiment, the two fixing plates are respectively the first fixing plate 110 and the second fixing plate 150. A sealed cavity 180 is formed among the first fixing plate 110, the second fixing plate 150, the inner shaft sleeve 160, the housing 170, and the plurality of magnetic cores 120. A cooling liquid is injected into the sealed cavity 180. The cooling liquid is used to cool the coil winding 140 and the magnetic cores 120 to cool down the axial motor stator 100 and improve the efficiency of the axial motor 10. The cooling liquid can be cooling oil. The sealed cavity 180 in this embodiment is reused for the first fixing plate 110 and the second fixing plate 150 that fix the magnetic cores 120, and a part of the magnetic cores 120 is located within the sealed cavity 180, without additional cooling pipes, saving costs. Moreover, the magnetic cores 120 and the coil winding 140 are located within the sealed cavity 180, and the cooling liquid can directly contact the magnetic cores 120 and the coil winding 140, improving the cooling effect.

[0173] It should be noted that the various implementable ways of the axial motor 10 in the foregoing embodiments are also applicable to the axial motor 10 in this embodiment, and will not be elaborated herein.

[0174] The axial motor, power assembly and electric device provided by the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in specific embodiments and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An axial motor, characterized in that, including an axial motor stator, the axial motor stator being sleeved on a motor shaft through an inner shaft sleeve, the axial motor stator comprising: a plurality of magnetic cores, the plurality of magnetic cores being arranged at intervals around the inner shaft sleeve in sequence, each magnetic core including a magnetic core winding portion and a magnetic core end portion located at one end of the magnetic core winding portion along the axial direction of the inner shaft sleeve, the magnetic core end portion covering a partial end face of the magnetic core winding portion, an end face of the magnetic core winding portion not covered by the magnetic core end portion constituting a stepped surface, and a cross-sectional area of the magnetic core end portion being smaller than a cross-sectional area of the magnetic core winding portion; a fixing plate fixed to an end face of the inner shaft sleeve, the fixing plate including a receiving groove recessed toward the end face of the inner shaft sleeve, an opening of the receiving groove facing away from the end face of the inner shaft sleeve along the axial direction of the inner shaft sleeve, the receiving groove being provided with a plurality of magnetic core receiving holes respectively corresponding to receiving the magnetic core end portions of the plurality of magnetic cores, and a partial surface of the fixing plate facing the magnetic core winding portion being connected to the stepped surface of each magnetic core.

2. The axial motor according to claim 1, wherein Each of the magnetic core receiving holes penetrates through the fixing plate, and the magnetic core end portions of each magnetic core are respectively inserted into one of the plurality of magnetic core receiving holes.

3. The axial motor according to claim 1, characterized in that, The stepped surface is arranged around the magnetic core end portion.

4. The axial motor according to claim 1, wherein The axial motor stator further includes a plurality of pole shoes located in the receiving groove, each of the plurality of pole shoes being respectively located on a peripheral side of a magnetic core end portion of one of the plurality of magnetic cores, and two adjacent pole shoes being arranged at intervals.

5. The axial motor according to claim 4, wherein An axial projection of the pole shoe on the stepped surface is at least partially located within the stepped surface along the axial direction of the inner shaft sleeve.

6. The axial motor according to claim 4, characterized in that The pole shoe is annular, and each of the plurality of pole shoes is sleeved on a magnetic core end portion of one magnetic core.

7. The axial motor according to claim 4, wherein The pole shoe is connected to at least a partial bottom of the receiving groove, and an axial projection of the pole shoe on the bottom of the receiving groove is located within the bottom of the receiving groove along the axial direction of the inner shaft sleeve.

8. The axial motor according to any one of claims 4-7, characterized in that, The magnetic core end portion includes a magnetic core connecting portion and a magnetic core sub-end portion arranged along the axial direction of the inner shaft sleeve, the magnetic core connecting portion being located between the magnetic core sub-end portion and the magnetic core winding portion, the magnetic core sub-end portion covering a partial end face of the magnetic core connecting portion, an end face of the magnetic core connecting portion not covered by the magnetic core sub-end portion constituting a secondary stepped surface, and the pole shoe being connected to at least a partial secondary stepped surface and at least a partial bottom of the receiving groove.

9. The axial motor according to any one of claims 4-7, characterized in that, The receiving groove is filled with potting glue, and the potting glue is distributed between the pole shoe and a groove wall of the receiving groove, between the pole shoe and the magnetic core, and between the groove wall of the receiving groove and the magnetic core.

10. The axial motor according to any one of claims 1-7, characterized in that, The axial motor stator further includes two fixing plates and a housing; the two fixing plates are respectively located at two ends of the inner shaft sleeve along the axial direction of the inner shaft sleeve, and inner circumferential portions of the two fixing plates are hermetically fixed to two ends of the inner shaft sleeve along the axial direction of the inner shaft sleeve; Two ends of the housing along the axial direction of the housing are respectively hermetically fixed to outer circumferential portions of the two fixing plates; Each of the multiple magnetic cores includes two magnetic core end portions located at both ends of the magnetic core winding portion, and each of the magnetic core end portions is hermetically fixed to the hole wall of the magnetic core receiving hole in the fixing plate on the same side, so that a sealed cavity is formed between the two fixing plates, the inner shaft sleeve, the outer housing and the multiple magnetic cores, and the sealed cavity is used to receive a cooling liquid.

11. The axial motor according to claim 10, wherein, An inner ring seal is provided between the inner peripheral portion of each fixing plate and the inner shaft sleeve, and the inner ring seal is used to seal the inner peripheral portion of the fixing plate and the inner shaft sleeve; An outer ring seal is provided between the outer peripheral portion of each fixing plate and the outer housing, and the outer ring seal is used to seal the outer peripheral portion of the fixing plate and the outer housing.

12. The axial motor according to any one of claims 1-7, characterized in that, The inner peripheral portion of the fixing plate is provided with an inner peripheral stop, and one end of the inner shaft sleeve facing the fixing plate is provided with a shaft sleeve stop, and the inner peripheral stop and the shaft sleeve stop are hermetically fixed.

13. A powertrain, characterized in that, It includes a gearbox and an axial motor according to any one of claims 1-12, and the axial motor is in transmission connection with the power input shaft of the gearbox for outputting power to the power input shaft.

14. An electric device, characterized in that, The electric device includes a device body and an axial motor according to any one of claims 1-12, and the axial motor is installed on the device body; or The electric device includes a device body and a power assembly according to claim 13, and the power assembly is installed on the device body.

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