Stator assemblies, axial flux motors, electric drive systems, and electric motors.

Abstract

This application provides a stator assembly (111), an axial flux motor (11), an electric drive unit (10), a system (100), and an electric motor, wherein the stator assembly (111) includes two cores (1111), the air gap sides of the two cores (1111) are installed facing each other or back to back, and the air gap sides of the cores (1111) are provided with a plurality of winding grooves (11113) installed around the central axis of the stator assembly (111), the projection of the stator assembly (111) along the cores (1111) in the axial direction is a first projection, and in the first projection, the longitudinal direction of the winding grooves (11113) is inclined with respect to the radial direction of the cores (1111).

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application claims the benefit of Chinese Patent Application No. 202310905758.9, filed on July 21, 2023, entitled "Stator Assembly, Axial - Flux Motor, Electric Drive Device, System, and Electric Equipment", the entire content of which is incorporated herein by reference in its entirety.

[0002] This application belongs to the field of motor technology, and more specifically, relates to a stator assembly, an axial - flux motor, an electric drive device, a system, and electric equipment.

Background Art

[0003] An axial - flux motor is a motor in which the magnetic - flux direction is the axial direction. Due to the relatively small axial size of the axial - flux motor, it is becoming increasingly popular among people. The stator assembly of an axial - flux motor generally includes two stators. In order to reduce the eddy - current loss of the axial - flux motor, the two stators generally adopt different winding structures, which makes the assembly process of the axial - flux motor very complicated. As can be seen, how to simplify the assembly process of the axial - flux motor is a technical problem that needs to be solved urgently.

Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a stator assembly, an axial - flux motor, an electric drive device, a system, and electric equipment in order to solve the technical problem that the assembly process of the axial - flux motor in the related technology is complicated.

[0005] To achieve the above objectives, the invention of this model employs the following technical solution: A stator assembly is provided for application in an axial flux motor, the stator assembly comprising two cores, the air gap sides of the two cores being installed opposite each other or back-to-back, and the air gap sides of the cores being provided with a plurality of winding grooves surrounding the central axis of the stator assembly, the projection of the cores along the axial direction of the stator assembly being a first projection, and in the first projection, the longitudinal direction of the winding grooves is inclined with respect to the radial direction of the cores.

[0006] The stator assembly according to the embodiment of this application has at least the following beneficial effects. The two iron cores of the stator assembly according to the embodiment of this application are installed facing each other or back to back, and a plurality of winding grooves are provided on the air gap side of the iron cores, and in the projection of the iron cores along the axial direction of the stator assembly, the longitudinal direction of the winding grooves is inclined with respect to the radial direction of the iron core, and the inclination width of the winding grooves of the two iron cores is the same and the inclination direction is opposite, in this way the magnetic flux can be transmitted alternately between the two iron cores, the portion of the magnetic path of the axial magnetic flux motor located between the two iron cores exhibits a meandering structure and is extended, the length of the magnetic path of the axial magnetic flux motor is effectively increased, thereby effectively weakening the armature reaction of the axial magnetic flux motor, and further effectively suppressing the eddy current loss of the axial magnetic flux motor. Compared to a method in which the two sets of windings employ different winding structures, the two sets of windings of the stator assembly according to the embodiment of this application may employ the same winding structure, thereby effectively simplifying the manufacturing and assembly process of the axial magnetic flux motor.

[0007] In some embodiments of this application, the projection of the stator assembly along the axial direction of the stator assembly is a second projection, in which multiple winding grooves of one core intersect with multiple winding grooves of another core in a one-to-one correspondence.

[0008] By adopting the above technical proposal, the length of the magnetic path in the stator assembly can be further increased, allowing the magnetic field to be distributed more uniformly between the two iron cores. This effectively reduces the magnetic field gradient of the axial flux motor, thereby further weakening the armature reaction of the axial flux motor and further suppressing eddy current losses in the axial flux motor.

[0009] In some embodiments of this application, the number of winding grooves in the core is N, one end of the winding grooves penetrates the inner circumferential wall of the core to form a first open end, the other end of the winding grooves penetrates the outer circumferential wall of the core to form a second open end, in the first projection, the center of the core is connected to the midpoint of the first open end to form a first radial line, the center of the core is connected to the midpoint of the second open end to form a second radial line, and the angle between the first radial line and the second radial line is θ, where 180° / N ≤ θ ≤ 360° / N.

[0010] By adopting the above technical proposal, the inclination angle of the winding groove can be limited to a reasonable range. In this way, not only can the torque loss of the axial flux motor be reduced, but the torque ripple of the axial flux motor can also be effectively suppressed, thereby effectively improving the stability of the axial flux motor.

[0011] In some embodiments of this application, in the first projection, each angle θ is the same, and the angle θ of the two iron cores is the same.

[0012] By adopting the above technical proposal, the operational stability of the axial magnetic flux motor can be effectively improved.

[0013] In some embodiments of this application, the stator assembly further includes an injection-molded member, the core including a plurality of teeth, the plurality of teeth being spaced apart along the circumferential direction of the stator assembly to form a plurality of winding grooves, and the plurality of teeth being connected by the injection-molded member.

[0014] By adopting the above technical proposal, it is not necessary to add a yoke section to the iron core, the magnetic impedance of the stator assembly can be reduced, and thereby the magnetic saturation phenomenon of the stator assembly can be effectively improved.

[0015] In some embodiments of this application, multiple teeth portions of two iron cores are integrally connected by an injection-molded member.

[0016] By adopting the above-described technology, the injection-molded member can be formed directly by the injection molding process, and the multiple teeth portions of the two iron cores can be connected integrally. This effectively simplifies the assembly process of the stator assembly and further simplifies the assembly process of the axial magnetic flux motor.

[0017] In some embodiments of this application, when the air gap sides of the two cores are installed back to back, the teeth of the two cores are installed in close contact along the axial direction of the stator assembly.

[0018] By adopting the above technical proposal, the axial size of the stator assembly can be effectively reduced, thereby effectively reducing the volume of the axial magnetic flux motor.

[0019] In some embodiments of this application, the core includes a yoke and a plurality of teeth installed on the yoke, the plurality of teeth being spaced apart along the circumferential direction of the stator assembly to form a plurality of winding grooves, and the yokes of the two cores are a single unit when the air gap sides of the two cores are installed back to back.

[0020] By adopting the above technical proposal, one yoke section can be shared between the teeth sections of two iron cores, thereby effectively simplifying the stator assembly process and further simplifying the axial flux motor assembly process.

[0021] In some embodiments of the present application, the stator assembly further includes two sets of winding bodies, the winding bodies include windings circumferentially provided in winding grooves, and the windings are flat wires.

[0022] By adopting the above technical solution, the filling rate in the winding grooves of the winding bodies can be effectively improved, thereby effectively improving the operating efficiency of the axial flux motor.

[0023] In some embodiments of the present application, the stator assembly further includes two sets of winding bodies, the winding bodies are circumferentially provided in the winding grooves, and the winding bodies are distributed winding bodies.

[0024] By adopting the above technical solution, the asymmetry of the magnetic field waveform of the axial flux motor can be effectively reduced, thereby effectively reducing the winding body harmonics and further suppressing the eddy current loss of the axial flux motor.

[0025] In some embodiments of the present application, a plurality of inlets are provided on the air gap side of the iron core, the plurality of inlets communicate with the plurality of winding grooves in a one-to-one correspondence, and the width of the inlet is smaller than the width of the winding groove.

[0026] By adopting the above technical solution, the winding bodies can be effectively restricted in the winding grooves, thereby effectively reducing the risk that the winding bodies break away from the winding grooves and improving the reliability of the axial flux motor.

[0027] In some embodiments of the present application, the stator assembly further includes a stator housing for accommodating a cooling medium, and the iron core is accommodated in the stator housing.

[0028] By adopting the above technical solution, the heat generated when the stator assembly operates can be directly transferred to the cooling medium, thereby effectively improving the cooling efficiency of the stator assembly and effectively improving the reliability of the axial flux motor.

[0029] Embodiments of the present application further provide an axial flux motor including the stator assembly of any of the above embodiments.

[0030] The axial flux motor according to the embodiments of the present application has at least the following beneficial effects. Since the axial flux motor according to the embodiments of the present application adopts the stator assembly of any of the above embodiments, the assembly process of the axial flux motor is effectively simplified.

[0031] In some embodiments of the present application, the axial flux motor further includes a rotor. When the air gap sides of the two iron cores are arranged opposite to each other, the rotor is arranged between the two iron cores and coaxially with the two iron cores.

[0032] By adopting the above technical solution, the assembly process of the single-rotor axial flux motor is effectively simplified.

[0033] In some embodiments of the present application, the axial flux motor further includes two rotors. When the air gap sides of the two iron cores are arranged back to back, one rotor is arranged opposite to the air gap side of one iron core, and the other rotor is arranged opposite to the air gap side of the other iron core.

[0034] By adopting the above technical solution, the assembly process of the dual-rotor axial flux motor is effectively simplified.

[0035] Embodiments of the present application further provide an electric drive device including the axial flux motor of any of the above embodiments.

[0036] The electric drive device according to the embodiments of the present application has at least the following beneficial effects. Since the electric drive device according to the embodiments of the present application adopts the axial flux motor of any of the above embodiments, the assembly process of the electric drive device is effectively simplified.

[0037] Embodiments of this application further provide an electric drive system comprising a battery and the electric drive device, wherein the battery is electrically connected to the electric drive device.

[0038] The electric drive system according to the embodiment of this application has at least the following beneficial effects. The electric drive system according to the embodiment of this application effectively simplifies the assembly process of the electric drive system by employing the electric drive device of any of the above embodiments.

[0039] Embodiments of this application further provide electric equipment including the above-described electric drive system.

[0040] The electric equipment according to the embodiments of this application has at least the following beneficial effects. The electric equipment according to the embodiments of this application effectively simplifies the assembly process of the electric equipment because it employs the electric drive system of any of the embodiments described above. [Brief explanation of the drawing]

[0041] To more clearly illustrate the technical concepts in the embodiments of this application, the following briefly introduces the drawings that may be used in the embodiments or related technical descriptions. It is obvious that the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without expending any creative effort. [Figure 1] This is a schematic diagram of the structure of a vehicle according to an embodiment of this application. [Figure 2] This is a schematic diagram of the disassembled structure of a battery according to an embodiment of this application. [Figure 3] This is a schematic diagram of the structure of an electric drive device according to an embodiment of this application. [Figure 4] This is a schematic diagram of the structure of an axial magnetic flux motor according to one embodiment of this application. [Figure 5] This is a schematic diagram of the structure of an axial magnetic flux motor according to another embodiment of this application. [Figure 6] This is a schematic diagram of the structure of an axial magnetic flux motor according to another embodiment of this application. [Figure 7]This is a schematic diagram of the structure of the first projection of the iron core according to the embodiment of this application. [Figure 8] This is a schematic diagram of the second projection structure of the stator assembly according to the embodiment of this application. [Figure 9] This is a schematic diagram of the assembly structure of the core and windings in a stator assembly according to an embodiment of this application. [Figure 10] Figure 9 is a schematic cross-sectional view showing the windings of the winding body placed within the winding grooves of the iron core. [Modes for carrying out the invention]

[0042] To clarify the technical problem, technical solution, and beneficial effects that this application aims to solve, the application will be described in more detail, linking it with the following drawings and embodiments. It should be understood that the specific embodiments described herein are for interpretation purposes only and do not limit this application.

[0043] It should be explained that when an element is referred to as "fixed to" or "installed on" another element, it may be directly or indirectly positioned on the other element. When one element is referred to as "connected" to another element, it may be directly or indirectly connected to the other element.

[0044] It should be understood that the directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are directions or positional relationships shown based on the drawings and are merely for the convenience and simplification of the description in this application. They do not indicate or imply that the mentioned device or element has a specific direction or must be configured and operated in a specific direction, and therefore should not be understood as limitations on this application.

[0045] Furthermore, the terms "first" and "second" are used solely for descriptive purposes and should not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features being referred to. Thus, features to which "first" and "second" are limited may explicitly or implicitly include one or more such features. In the description of this application, unless otherwise clearly and specifically limited, "multiple" means two or more.

[0046] A motor is a power device for electric equipment, and is used to drive the operation of electric equipment by converting electrical energy into mechanical energy. Here, an axial flux motor refers to a motor in which the magnetic flux direction is axial and the current-carrying conductors are arranged radially. The stator assembly of an axial flux motor generally includes two iron cores and two sets of windings, with multiple winding grooves provided on the air gap side of the iron cores, one set of windings circumferentially arranged in the winding grooves of one iron core, and the other set of windings circumferentially arranged in the winding grooves of the other iron core.

[0047] In related technologies, the longitudinal direction of the winding groove of the core is parallel to the radial direction of the core, and the winding grooves of the two cores are installed facing each other one-to-one or back-to-back one-to-back, and when the two sets of winding bodies adopt the same winding structure, the portion of the magnetic path of the axial flux motor located between the two cores extends in a nearly linear structure, thus causing a shortening of the magnetic path of the axial flux motor, which in turn enhances the armature response of the axial flux motor and increases the eddy current loss of the axial flux motor. To suppress the eddy current loss of the axial flux motor, manufacturers generally adopt different winding structures for the two sets of winding bodies, but this complicates the assembly process of the axial flux motor, thereby significantly increasing the difficulty of assembly and decreasing the assembly efficiency of the axial flux motor.

[0048] In order to suppress eddy current losses in an axial flux motor and simplify the assembly process of the axial flux motor, the two cores of the stator assembly according to the embodiment of this application are installed facing each other or back to back, and a plurality of winding grooves are provided on the air gap side of the cores. In the projection of the cores along the axial direction of the stator assembly, the longitudinal direction of the winding grooves is inclined with respect to the radial direction of the cores, and the inclination width of the winding grooves of the two cores is the same, but the inclination direction is opposite. In this way, the magnetic flux is transmitted alternately between the two cores, and the portion of the magnetic path of the axial flux motor located between the two cores is extended in a meandering structure, effectively increasing the length of the magnetic path of the axial flux motor, thereby effectively weakening the armature reaction of the axial flux motor, and further effectively suppressing eddy current losses of the axial flux motor. Compared to a method in which two sets of windings employ different winding structures, the two sets of windings of the stator assembly according to the embodiment of this application may employ the same winding structure, thereby effectively simplifying the assembly process of the axial flux motor.

[0049] The axial flux motor according to the embodiment of this application can be applied to electric devices, which may include, but are not limited to, vehicles, portable devices, ships, aerospace vehicles, electric toys, and power tools. Vehicles may be fuel-oil vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may include pure electric vehicles, hybrid vehicles, or range-extender vehicles. Aerospace vehicles include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric steamship toys, and electric airplane toys. Power tools include metal cutting power tools, polishing power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, hammer drills, concrete vibrators, and electric planers.

[0050] In the following embodiments, for the sake of clarity, the electric device of one embodiment of this application will be described as a vehicle.

[0051] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of a vehicle 1000 according to an embodiment of this application. The vehicle 1000 may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle. The vehicle 1000 includes a vehicle body and an electric drive system 100.

[0052] The vehicle body is the main support member of the vehicle 1000, and the vehicle body has an engine room and a crew room. The engine room is used to house the vehicle 1000's power mechanism, electrical control mechanism, transmission mechanism, etc., and the crew room is used to provide the crew with an operating space and a riding space. If the vehicle 1000 is a front-wheel drive vehicle, the engine room is located at the front of the vehicle body, i.e., the engine room is the front engine room. If the vehicle 1000 is a rear-wheel drive vehicle, the engine room is located at the rear of the vehicle body, i.e., the engine room is the rear engine room. If the vehicle 1000 is a four-wheel drive vehicle, the engine room is divided into a front engine room and a rear engine room, with the front engine room located at the front of the vehicle body and the rear engine room located at the rear of the vehicle body. The crew room is located between the front and rear of the vehicle body.

[0053] The electric drive system 100 is the power system of the vehicle 1000, and is used to drive the vehicle 1000 by converting electrical energy into mechanical energy and outputting this mechanical energy to the wheels of the vehicle 1000. The electric drive system 100 is installed in the vehicle body, and specifically, part of the electric drive system 100 may be installed in the engine room, and other parts of the electric drive system 100 may be installed in the bottom of the vehicle body.

[0054] Referring to Figure 1, the electric drive system 100 according to the embodiment of this application includes an electric drive device 10 and a battery 20.

[0055] The electric drive unit 10 converts the electrical energy provided by the battery 20 into mechanical energy and outputs this mechanical energy to the wheels of the vehicle 1000 to drive the vehicle 1000, and when recovering kinetic energy, the electric drive unit 10 is used as a generator to convert mechanical energy into electrical energy and transport the generated electrical energy to the battery 20 for storage. The electric drive unit 10 is installed in the engine room. Specifically, if the vehicle 1000 is a front-wheel drive vehicle, the electric drive unit 10 is located at the front of the vehicle 1000 and is used to drive the vehicle 1000 by outputting the mechanical energy to the front wheels of the vehicle 1000. If the vehicle 1000 is a rear-wheel drive vehicle, the electric drive unit 10 is located at the rear of the vehicle 1000 and is used to drive the vehicle 1000 by outputting the mechanical energy to the rear wheels of the vehicle 1000. If the vehicle 1000 is a four-wheel drive vehicle, there may be two electric drive units 10, one of which is located at the front of the vehicle 1000 and is used to output the mechanical energy to the front wheels of the vehicle 1000, and the other electric drive unit 10 is located at the rear of the vehicle 1000 and is used to drive the vehicle 1000 by outputting the mechanical energy to the rear wheels of the vehicle 1000.

[0056] The battery 20 is used to supply electrical energy to the electric drive unit 10 and may be installed at the bottom, head, or tail of the vehicle 1000. Referring to Figure 2, which is an exploded schematic view of the battery 20 according to an embodiment of the present application, the battery 20 comprises a housing 21 and battery cells 22, the battery cells 22 being housed within the housing 21. Here, the housing 21 is used to provide a housing space for the battery cells 22, and the housing 21 may employ various structures. In some embodiments, the housing 21 may include a first portion 211 and a second portion 212, the first portion 211 and the second portion 212 overlapping each other, and the first portion 211 and the second portion 212 jointly define a housing space for housing the battery cells 22. The second part 212 may be a hollow structure with one end open, and the first part 211 may be a plate-like structure. The first part 211 is placed over the open side of the second part 212 so that the first part 211 and the second part 212 jointly define a housing space. Both the first part 211 and the second part 212 may be hollow structures with one end open, and the open side of the first part 211 is placed over the open side of the second part 212. Of course, the housing 21 formed by the first part 211 and the second part 212 may be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0057] In some embodiments, the housing 21 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 21 may be at least part of the floor of the vehicle 1000, or a portion of the housing 21 may be at least part of the cross members and side members of the vehicle 1000.

[0058] Of course, in some embodiments, the battery 20 may not include a housing 21, and multiple battery cells 22 may be electrically connected and assembled into the vehicle 1000 after being formed as a whole by the necessary fixing structure.

[0059] In the battery 20, there may be multiple battery cells 22, and the multiple battery cells 22 may be connected in series, in parallel, or in series-parallel. Series-parallel connection means that among the multiple battery cells 22, there are both series and parallel connections. Multiple battery cells 22 may be directly connected in series, in parallel, or in series-parallel, and the entire assembly of multiple battery cells 22 may be housed in the housing 21. Of course, the battery 20 may first be formed by connecting multiple battery cells 22 in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules may be further connected in series, in parallel, or in series-parallel to form a single whole, which may then be housed in the housing 21. The battery 20 may further include other functional members; for example, this battery 20 may further include busbar members for realizing electrical connections between multiple battery cells 22.

[0060] Here, each battery cell 22 may be a secondary battery or a primary battery, where a secondary battery is a battery cell 22 that can be used continuously by activating the active material through a charging method after the battery cell 22 has been discharged, and a primary battery is a battery cell 22 that cannot be used continuously by activating the active material through a charging method after the electrical energy of the battery cell 22 has been consumed, and the battery cell 22 may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., but is not limited to these. The battery cell 22 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 22 of other shape, and a prismatic battery cell includes a prismatic housing battery cell, a blade-type battery cell, and a polygonal prismatic battery cell, and a polygonal prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc., and is not particularly limited to the present application.

[0061] Referring to Figure 3, the electric drive unit 10 includes an axial flux motor 11, which is the main power output component of the electric drive unit 10 and is used to convert the electrical energy provided by the battery 20 into mechanical energy. The number of axial flux motors 11 may be one or more, and in some embodiments, there are two axial flux motors 11, which are installed coaxially, that is, the central axes of the two axial flux motors 11 overlap. The electric drive unit 10 may further include a transmission mechanism 13, which is a power transmission mechanism of the electric drive unit 10, and the transmission mechanism 13 has a power input terminal and a power output terminal, the power input terminal of the transmission mechanism 13 is connected to the rotating shaft of the axial flux motor 11, and the power output terminal of the transmission mechanism 13 is connected to the wheels of the vehicle 1000, and the transmission mechanism 13 transmits the mechanical energy to the wheels of the vehicle 1000 in a manner that changes the rotational speed and torque input by the axial flux motor 11, for example, the transmission mechanism 13 transmits the mechanical energy to the wheels of the vehicle 1000 in a manner that reduces the output rotational speed and increases the torque in response to the input to the axial flux motor 11, or for example, the transmission mechanism 13 transmits the mechanical energy to the wheels of the vehicle 1000 in a manner that increases the output rotational speed and decreases the torque in response to the input to the axial flux motor 11. Of course, in other embodiments, the gear shift mechanism 13 may also be used to change the direction of the output shaft of the electric drive unit 10 relative to the output shaft of the axial flux motor 11, for example by employing a bevel gear or worm gear structure to connect to the output shaft of the axial flux motor 11 and further change the direction of torque output. Selectively, the gear shift mechanism 13 may be a gear shaft gear shift mechanism, a worm gear gear shift mechanism, a planetary gear gear shift mechanism, a continuously variable gear mechanism, etc., but is not limited to these, and is not specifically limited here. The electric drive unit 10 may further include a controller 12, which is used to convert the DC current output from the battery 20 into AC current and to transport the AC current to the axial flux motor 11, as well as to control the operation of the axial flux motor 11, for example, to control the starting and stopping, rotational speed, torque, etc. of the axial flux motor 11.Of course, in other embodiments, the controller 12 may also be used to rectify the alternating current generated by the rotation of the axial magnetic flux motor 11 into a direct current and transport it to the battery 20 to realize a kinetic energy recovery function for the vehicle 1000.

[0062] Referring together to Figures 4 to 6, the axial flux motor 11 includes a stator assembly 111 and a rotor 112, where the rotor 112 is the rotating part of the axial flux motor 11 and the stator assembly 111 is the stationary part of the axial flux motor 11. The axial flux motor 11 may further include a housing 113, which is used to provide a mounting environment for the stator assembly 111 and the rotor 112, and at the same time serves as a support member for the axial flux motor 11. Selectively, the housing 113 may be a single molded member or an assembled member made of multiple parts. The material of the housing 113 may be copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., but is not limited thereto and is not specifically limited thereto.

[0063] The stator assembly 111 according to the embodiment of this application will be described below, with reference to the drawings.

[0064] In the first embodiment, referring together to Figures 4 to 7, the embodiment of the present application provides a stator assembly 111 comprising two cores 1111, the air gap sides of the two cores 1111 being installed facing each other or back to back, and the air gap sides of the cores 1111 are provided with a plurality of winding grooves 11113 installed surrounding the central axis of the stator assembly 111, the projection of the cores 1111 along the axial direction of the stator assembly 111 is the first projection, and in the first projection, the longitudinal direction of the winding grooves 11113 is inclined with respect to the radial direction of the cores 1111.

[0065] The iron core 1111 is an important component of the magnetic path 114 of the axial flux motor 11, and the iron core 1111, rotor 112, and the air gap between the iron core 1111 and rotor 112 together constitute the magnetic path 114 of the axial flux motor 11. In some embodiments, the iron core 1111 may be an assembled member made up of multiple members, for example, the iron core 1111 may be made by laminating multiple perforated sheets. In some other embodiments, the iron core 1111 may be a integrally molded member, for example, the iron core 1111 may be integrally molded by a casting process.

[0066] The air gap side of the core 1111 is the side of the core 1111 that faces the rotor 112 and is spaced apart from the rotor 112, and the air gap side of the core 1111 forms an air gap with the rotor 112. The air gap sides of the two cores 1111 may be installed facing each other or back to back. In some embodiments, referring together to Figures 4 and 5, the air gap sides of the two cores 1111 are installed back to back, and in this embodiment, there are two rotors 112 of the axial flux motor 11, and the air gap side of one core 1111 is installed facing one rotor 112, and the air gap side of the other core 1111 is installed facing the other rotor 112, in other words the stator assembly 111 is installed between the two rotors 112. In another embodiment, referring to Figure 6, the air gap sides of the two iron cores 1111 are positioned opposite each other with a gap between them. In this embodiment, the axial flux motor 11 has one rotor 112, with the air gap side of one iron core 1111 positioned opposite one axial side of this rotor 112, and the air gap side of the other iron core 1111 positioned opposite the other axial side of this rotor 112. In other words, this rotor 112 is positioned between the two iron cores 1111.

[0067] The winding groove 11113 is a portion that provides a space for housing the winding body 1114. In some embodiments, the core 1111 includes a plurality of teeth 11111, which are spaced apart and surrounding the central axis of the stator assembly 111 to form a plurality of winding grooves 11113. As can be understood, one end of the winding groove 11113 penetrates the inner circumferential wall of the core 1111 to form a first open end 11114, and the other end of the winding groove 11113 penetrates the outer circumferential wall of the core 1111 to form a second open end 11115. The number of winding grooves 11113 may be determined according to the needs of the actual application, for example, the number of winding grooves 11113 may be 18, 24, 36, etc., and is not specifically limited here.

[0068] The stator assembly 111 further includes two sets of windings 1114, one set of windings 1114 circumferentially located within a winding groove 11113 of one core 1111, and the other set of windings 1114 circumferentially located within a winding groove 11113 of the other core 1111. When power is supplied to the windings 1114, the stator assembly 111 generates an electromagnetic field, which is magnetically coupled to the rotor 112 to drive the rotation of the rotor 112. The winding 1114 may be an integer groove winding, a fractional groove winding, a concentrated winding, or a distributed winding, but is not limited to these. Here, an integer groove winding refers to a winding 1114 in which the number of winding grooves 11113 occupied by each pole and each phase is an integer; a fractional groove winding refers to a winding 1114 in which the number of winding grooves 11113 occupied by each pole and each phase is a fraction; and a concentrated winding refers to a winding in which all coils of a single winding 1114 are connected to the iron core 111 In a winding body 1114, the coils are concentrated in the same tooth portion 11111, and both ends of the coil are connected to the same position via a conductor, forming a single common connection point. Such a winding body 1114 is called a concentrated winding body. In a dispersed winding body, each coil is distributed across multiple winding grooves 11113, and adjacent coils are connected with a constant phase difference. Such a winding body 1114 is also called a dispersed winding body.

[0069] In the following, for the sake of explanation, any plane perpendicular to the central axis of the stator assembly 111 will be used as the reference plane, and the winding groove 11113 may be installed at an angle to this reference plane or parallel to this reference plane. The projection of the core 1111 onto this reference plane is the first projection, in which the longitudinal direction of the winding groove 11113 is inclined with respect to the radial direction of the core 1111, where the longitudinal direction of the winding groove 11113 refers to the longitudinal direction of the figure formed in the first projection of the winding groove 11113, specifically the direction from the first open end 11114 to the second open end 11115 or from the second open end 11115 to the first open end 11114. In this first projection, the angle of the angle between the longitudinal direction of the winding groove 11113 and the radial direction of the core 1111 may be determined according to the needs of the actual application and is not specifically limited here.

[0070] Referring to Figure 8, the projection of the stator assembly 111 on the above reference plane is the second projection, in which the two cores 1111 are installed facing each other or back to back, and in the first projection, the longitudinal direction of the winding groove 11113 is inclined with respect to the radial direction of the core 1111, so the inclination width of the winding grooves 11113 of the two cores 1111 is made the same and the inclination direction is reversed, so in the second projection, one winding groove 11113 of one core 1111 and one winding groove 11113 of the other core 1111 that is adjacent to or facing the aforementioned winding groove 11113 are made as a pair, and in this pair of winding grooves 11113, at least the extension lines of the two winding grooves 11113 intersect.

[0071] In the embodiment of the present application, the two cores 1111 of the stator assembly 111 are installed facing each other or back to back, and a plurality of winding grooves 11113 are provided on the air gap side of the cores 1111. In the projection of the cores 1111 along the axial direction of the stator assembly 111, the longitudinal direction of the winding grooves 11113 is inclined with respect to the radial direction of the cores 1111, and the inclination width of the winding grooves 11113 of the two cores 1111 is the same, but the inclination direction is opposite, so that magnetic flux can be transmitted alternately between the two cores 1111, as shown in Figures 4 to 7, axial magnetic flux mode The portion of the magnetic path 114 of the stator 11 located between the two iron cores 1111 is extended to exhibit a meandering structure, effectively increasing the length of the magnetic path 114 of the axial flux motor 11, thereby effectively weakening the armature reaction of the axial flux motor 11, and further effectively suppressing the eddy current loss of the axial flux motor 11. Compared to a system in which two sets of windings 1114 employ different winding structures, the two sets of windings 1114 of the stator assembly 111 according to the embodiment of this application may employ the same winding structure, thereby effectively simplifying the manufacturing and assembly process of the axial flux motor 11.

[0072] In some embodiments of this application, referring to Figure 8, in the second projection, the multiple winding grooves 11113 of one core 1111 are arranged to intersect with the multiple winding grooves 11113 of another core 1111 in a one-to-one correspondence.

[0073] In other words, in the second projection, the multiple winding grooves 11113 of one core 1111 correspond one-to-one with the multiple winding grooves 11113 of another core 1111, with one winding groove 11113 of one core 1111 and one winding groove 11113 of the other core 1111 forming a pair, and in this pair of winding grooves 11113, the two winding grooves 11113 are positioned so that the figures formed in the second projection intersect.

[0074] In some embodiments, the figure formed in the second projection by the first open end 11114 of the winding groove 11113 of one core 1111 intersects with the figure formed in the second projection by the first open end 11114 of the winding groove 11113 of another core 1111, that is, in the second projection, the intersection of the winding grooves 11113 of the two cores 1111 may be located at the first open end 11114 of the winding groove 11113.

[0075] In some other embodiments, the figure formed in the second projection by the second open end 11115 of the winding groove 11113 of one core 1111 intersects with the figure formed in the second projection by the second open end 11115 of the winding groove 11113 of another core 1111, that is, in the second projection, the intersection of the winding grooves 11113 of the two cores 1111 is located at the second open end 11115 of the winding groove 11113.

[0076] In several other embodiments, the figure formed in the second projection by the central part of the winding groove 11113 of one iron core 1111 intersects with the figure formed in the second projection by the central part of the winding groove 11113 of another iron core 1111, that is, in the second projection, the intersection of the winding grooves 11113 of the two iron cores 1111 is located in the central part of the winding groove 11113.

[0077] By adopting the above technical proposal, the length of the magnetic path 114 of the stator assembly 111 can be further increased, allowing the magnetic field to be distributed more uniformly between the two iron cores 1111, effectively reducing the gradient of the magnetic field of the axial flux motor 11, thereby further weakening the armature reaction of the axial flux motor 11 and further suppressing eddy current losses of the axial flux motor 11.

[0078] In some embodiments of this application, referring to Figure 7, the number of winding grooves 11113 in the core 1111 is N, and in the first projection, the center of the core 1111 is connected to the midpoint of the first open end 11114 of one winding groove 11113 to form a first radial line 11116, and the center of the core 1111 is connected to the midpoint of the second open end 11115 of this winding groove 11113 to form a second radial line 11117, and the angle between the first radial line 11116 and the second radial line 11117 is θ, where 180° / N ≤ θ ≤ 360° / N.

[0079] The midpoint of the first open end 11114 points to the intersection of the median of the figure formed by the first projection of the winding groove 11113 and the figure formed by the first projection of the first open end 11114, and the first radial line 11116 passes through the center of the core 1111 and the midpoint of the first open end 11114. Similarly, the midpoint of the second open end 11115 points to the intersection of the median of the figure formed by the first projection of the winding groove 11113 and the figure formed by the first projection of the second open end 11115, and the second radial line 11117 passes through the center of the core 1111 and the midpoint of the second open end 11115.

[0080] The angle between the first radial line 11116 and the second radial line 11117 is θ, where 180° / N ≤ θ ≤ 360° / N. For example, if the number of winding grooves 11113 in the iron core 1111 is 18, then N = 18, and 10° ≤ θ ≤ 20°, for example θ = 10°, θ = 15°, θ = 20°, etc. Also, for example, if the number of winding grooves 11113 in the iron core 1111 is 24, then N = 24, 7.5° ≤ θ ≤ 15°, for example θ = 7.5°, θ = 10°, θ = 15°, etc. Also, for example, if the number of winding grooves 11113 in the iron core 1111 is 36, then N = 36, 5° ≤ θ ≤ 10°, for example θ = 5°, θ = 7.5°, θ = 10°, etc.

[0081] In the second projection, the angle of the angle between the two first radial lines 11116 corresponding to the two intersecting winding grooves 11113 is α, where α = 0 when the intersection of the winding grooves 11113 of the two cores 1111 is located at the first open end 11114 of the winding groove 11113, α = 2θ when the intersection of the winding grooves 11113 of the two cores 1111 is located at the second open end 11115 of the winding groove 11113, and 0 ≤ α ≤ 2θ when the intersection of the winding grooves 11113 of the two cores 1111 is located in the center of the winding groove 11113.

[0082] In related technologies, the torque of the axial magnetic flux motor 11 is inversely proportional to the inclination angle of the winding groove 11113 of the core 1111 with respect to the radial direction of the core 1111, and the torque ripple of the axial magnetic flux motor 11 is inversely proportional to the inclination angle of the winding groove 11113 of the core 1111 with respect to the radial direction of the core 1111. That is, the larger the inclination angle of the winding groove 11113 of the core 1111 with respect to the radial direction of the core 1111, the smaller the torque of the axial magnetic flux motor 11 and the smaller the torque ripple of the axial magnetic flux motor 11. Conversely, the smaller the inclination angle of the winding groove 11113 of the core 1111 with respect to the radial direction of the core 1111, the larger the torque of the axial magnetic flux motor 11 and the larger the torque ripple of the axial magnetic flux motor 11.

[0083] By adopting the above technical proposal, the inclination angle of the winding groove 11113 can be limited to a reasonable range. In this way, not only can the torque loss of the axial flux motor 11 be reduced, but the torque ripple of the axial flux motor 11 can also be effectively suppressed, thereby effectively improving the stability of the axial flux motor 11.

[0084] In some embodiments of this application, referring to Figure 7, in the first projection, each angle θ is the same, and the angle θ of the two iron cores 1111 is the same.

[0085] In other words, in the case of one core 1111, the inclination angle of each winding groove 11113 with respect to the corresponding first radial line 11116 is equal, and in the case of two cores 1111, the inclination angle of each winding groove 11113 of one core 1111 with respect to the corresponding first radial line 11116 is equal to the inclination angle of each winding groove 11113 of the other core 1111 with respect to the corresponding first radial line 11116, that is, the winding grooves 11113 of the two cores 1111 are the same.

[0086] By adopting the above technical proposal, the operational stability of the axial magnetic flux motor 11 can be effectively improved.

[0087] In some embodiments of this application, referring to Figure 4, the stator assembly 111 further includes an injection-molded member 1112, the core 1111 includes a plurality of teeth 11111, the plurality of teeth 11111 are spaced apart along the circumferential direction of the stator assembly 111 to form a plurality of winding grooves 11113, and the plurality of teeth 11111 are connected by the injection-molded member 1112.

[0088] The teeth portion 11111 is a protruding part of the iron core 1111, and in the circumferential direction of the iron core 1111, two adjacent teeth portions 11111 form a winding groove 11113 with a gap between them.

[0089] The injection-molded member 1112 is a member manufactured by an injection molding process. In some embodiments, during the manufacturing process of the stator assembly 111, a plurality of teeth 11111 may be arranged circumferentially and fixed using a fixing jig, and then the injection-molded member 1112 may be formed on the plurality of teeth 11111 by an injection molding process to integrally connect the plurality of teeth 11111. In some other embodiments, during the manufacturing process of the stator assembly 111, a plurality of teeth 11111 may be arranged circumferentially and fixed using a fixing jig, the windings 1114 may be placed circumferentially within each winding groove 11113, and then the injection-molded member 1112 may be formed on the entire structure formed by assembling the core 1111 and the windings 1114 by an injection molding process, thereby integrally connecting the core 1111 and the windings 1114.

[0090] By adopting the above technical proposal, it is not necessary to add a yoke section to the iron core 1111, the magnetic impedance of the stator assembly 111 can be reduced, and thereby the magnetic saturation phenomenon of the stator assembly 111 can be effectively improved.

[0091] In some embodiments of this application, referring to Figure 4, the multiple teeth portions 11111 of the two iron cores 1111 are integrally connected by an injection-molded member 1112.

[0092] In some embodiments, during the manufacturing process of the stator assembly 111, the multiple teeth portions 11111 of the two iron cores 1111 are arranged circumferentially and fixed using a fixing jig, and then the injection-molded member 1112 is formed on the multiple teeth portions 11111 of the two iron cores 1111 by an injection molding process to integrally connect the multiple teeth portions 11111 of the two iron cores 1111. In some other embodiments, during the manufacturing process, the multiple teeth portions 11111 of the two iron cores 1111 are arranged circumferentially and fixed using a fixing jig, two sets of winding bodies 1114 are placed circumferentially within the respective winding grooves 11113 of the iron cores 1111, and then the injection-molded member 1112 is formed on the entire assembled structure of the two iron cores 1111 and the two sets of winding bodies 1114 by an injection molding process, thereby integrally connecting the two iron cores 1111 and the two sets of winding bodies 1114.

[0093] By adopting the above-described technology, the injection-molded member 1112 can be formed directly by the injection molding process, and the multiple teeth portions 11111 of the two iron cores 1111 can be connected integrally, thereby effectively simplifying the assembly process of the stator assembly 111 and further simplifying the assembly process of the axial magnetic flux motor 11.

[0094] In some embodiments of this application, referring to Figure 4, when the air gap sides of the two iron cores 1111 are installed back to back, the teeth portions 11111 of the two iron cores 1111 are installed in close contact along the axial direction of the stator assembly 111.

[0095] To make it clear, this embodiment is applied to a dual rotor axial flux motor, in which the axial side of the teeth 11111 of one core 1111 is in close contact with the axial side of the teeth 11111 of the other core 1111, that is, there is no gap between the teeth 11111 of the two cores 1111, although, of course, a small gap may exist between the teeth 11111 of the two cores 1111 when considering assembly tolerances.

[0096] By adopting the above technical proposal, the axial size of the stator assembly 111 is effectively reduced, thereby effectively reducing the volume of the axial magnetic flux motor 11.

[0097] In some embodiments of this application, referring to Figure 5, the core 1111 further includes a yoke portion 11112, and a plurality of teeth portions 11111 are installed on the yoke portion 11112, and when the air gap sides of two cores 1111 are installed back to back, the yoke portions 11112 of the two cores 1111 are a single unit.

[0098] The yoke portion 11112 is a connection point for the iron core 1111 and is used to connect multiple teeth portions 11111. The yoke portion 11112 has a substantially disc-shaped structure, and the multiple teeth portions 11111 are installed on the yoke portion 11112 along the circumferential direction of the iron core 1111. As shown in Figure 5, when the yoke portions 11112 of two iron cores 1111 are an integrated member, it means that the yoke portions 11112 of the two iron cores 1111 are formed as a single unit. In some embodiments, the yoke portions 11112 of two iron cores 1111 are formed as a single unit by stacking multiple sheet bodies, and the multiple teeth portions 11111 of one iron core 1111 are installed on one axial side of this whole, and the multiple teeth portions 11111 of the other iron core 1111 are installed on the other axial side of this whole. In some other embodiments, the yoke portions 11112 of the two iron cores 1111 may be manufactured integrally by a casting process, with multiple teeth portions 11111 of one iron core 1111 mounted on one axial side of the whole, and multiple teeth portions 11111 of the other iron core 1111 mounted on the other axial side of the whole, where the casting process may be, but is not limited to, a die-casting process or a casting process.

[0099] By adopting the above technical proposal, one yoke section 11112 can be shared between the teeth sections 11111 of the two iron cores 1111, thereby effectively simplifying the assembly process of the stator assembly 111 and further simplifying the assembly process of the axial magnetic flux motor 11.

[0100] In some embodiments of this application, referring together to Figures 9 and 10, the winding body 1114 includes a winding 11141 arranged around a winding groove 11113, and the winding 11141 is a flat rectangular wire.

[0101] In this embodiment, the winding 11141 includes multiple wire segments, each of which is pre-manufactured in a flattened structure, and each wire segment is placed in the winding groove 11113 and stacked sequentially along the depth direction of the winding groove 11113 until the winding groove 11113 is sufficiently filled. It should be noted that the depth direction of the winding groove 11113 is parallel to the axial direction of the stator assembly 111.

[0102] By adopting the above technical proposal, the filling rate of the winding body 1114 within the winding groove 11113 can be effectively improved, thereby effectively improving the operating efficiency of the axial magnetic flux motor 11.

[0103] Of course, in other embodiments, the winding 11141 may be a round wire.

[0104] In some embodiments of this application, the winding 1114 is a dispersed winding.

[0105] By adopting the above-described technology, the asymmetry of the magnetic field waveform of the axial flux motor 11 can be effectively reduced, thereby effectively decreasing winding harmonics and further suppressing eddy current losses in the axial flux motor 11.

[0106] In some embodiments of this application, referring to Figure 10, a plurality of inlets 11118 are provided on the air gap side of the iron core 1111, and the plurality of inlets 11118 communicate with a plurality of winding grooves 11113 in a one-to-one correspondence, and the width of the inlets 11118 is smaller than the width of the winding grooves 11113.

[0107] The entry points 11118 are used to provide space for the windings 11141 of the winding body 1114 to enter the winding grooves 11113. The entry points 11118 penetrate the side of the air gap of the core 1111 and communicate with the winding grooves 11113, and as can be understood, each entry point 11118 communicates with one winding groove 11113.

[0108] The width of the entry opening 11118 is the size of the entry opening 11118 along the circumferential direction of the iron core 1111, and similarly, the width of the winding groove 11113 is the size of the winding groove 11113 along the circumferential direction of the iron core 1111. In the manufacturing process of the stator assembly 111, the windings 11141 of the winding body 1114 are placed into the winding groove 11113 through the entry opening 11118, and after multiple circumferential operations are performed on the windings 11141 of the winding body 1114, the coil is formed, and after the coil has sufficiently filled the winding groove 11113, the coil is less likely to detach from the winding groove 11113 through the entry opening 11118 because the width of the entry opening 11118 is smaller than the width of the winding groove 11113.

[0109] By adopting the above technical proposal, the winding body 1114 can be effectively confined within the winding groove 11113, thereby effectively reducing the risk of the winding body 1114 detaching from the winding groove 11113 and improving the reliability of the axial magnetic flux motor 11.

[0110] In some embodiments of this application, with reference to Figures 4 to 6, the stator assembly 111 further includes a stator housing 1113 for housing a cooling medium, and the iron core 1111 is housed within the stator housing 1113.

[0111] The stator housing 1113 is used to provide the internal environment of the stator assembly 111. Selectively, the stator housing 1113 may be a single molded member or an assembled member made of multiple parts. The material of the stator housing 1113 may be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, if the stator housing 1113 includes multiple parts, some parts of the stator housing 1113 may be made of a metallic material such as copper, iron, aluminum, stainless steel, or aluminum alloy, and other parts of the stator housing 1113 may be made of plastic, but is not limited to that here.

[0112] The cooling medium is a medium for absorbing the heat generated by the stator assembly 111. As can be understood, the iron core 1111 and windings 1114 are housed within the stator housing 1113 and in contact with the cooling medium, thereby directly transferring the heat generated by the iron core 1111 and the windings 1114 to the cooling medium, thereby achieving the objective of cooling the iron core 1111 and windings 1114. In some embodiments, the cooling medium may be housed stationarily within the stator housing 1113. In some other embodiments, the stator housing 1113 is provided with a supply port and a drain port, allowing the cooling medium to enter the stator housing 1113 through the supply port and exit the stator housing 1113 through the drain port, thereby allowing the cooling medium to cool the stator assembly 111 in a cyclic flow manner. Selectively, the cooling medium may be, but is not limited to, cooling oil, cooling water, etc., and is not specifically limited thereto.

[0113] In some embodiments, when the air gap sides of the two iron cores 1111 are installed back to back, the number of stator housings 1113 may be one, and the two iron cores 1111 are housed within the same stator housing 1113.

[0114] In some other embodiments, when the air gap sides of the two iron cores 1111 are installed facing each other, the number of stator housings 1113 may be two, with one iron core 1111 housed in one stator housing 1113 and the other iron core 1111 housed in the other stator housing 1113.

[0115] By adopting the above-described technology, the heat generated when the stator assembly 111 is operating can be directly transferred to the cooling medium, thereby effectively improving the cooling efficiency of the stator assembly 111 and effectively improving the reliability of the axial magnetic flux motor 11.

[0116] In some embodiments of this application, with reference to Figures 4 and 7 through 10, the stator assembly 111 includes an injection-molded member 1112, two iron cores 1111, and two sets of windings 1114. The air gap sides of the two iron cores 1111 are installed facing each other or back-to-back, and the iron core 1111 includes a plurality of teeth 11111, which are spaced apart and surround the central axis of the stator assembly 111, thereby forming a plurality of winding grooves 11113, one end of which penetrates the inner circumferential wall of the iron core 1111 to form a first open end 11114, and the other end of which penetrates the outer circumferential wall of the iron core 1111 to form a second open end 11115. The projection of the core 1111 along the axial direction of the stator assembly 111 is the first projection, and the projection of the stator assembly 111 along the axial direction of the stator assembly 111 is the second projection. In the first projection, the longitudinal direction of the winding groove 11113 is inclined with respect to the radial direction of the core 1111, the concentricity of the core 1111 is connected to the midpoint of the first open end 11114 to form the first radial line 11116, the concentricity of the core 1111 is connected to the midpoint of the second open end 11115 to form the second radial line 11117, the angle between the first radial line 11116 and the second radial line 11117 is θ, and the number of winding grooves 11113 of the core 1111 is N, where 180° / N ≤ θ ≤ 360° / N. In the second projection, the multiple winding grooves 11113 of one core 1111 are arranged to intersect with the multiple winding grooves 11113 of another core 1111 in a one-to-one correspondence, and this intersection includes the intersection of the projections of the two winding grooves 11113 or the intersection of the extensions of the two winding grooves 11113. One winding body 1114 is arranged around the multiple winding grooves 11113 of one core 1111, and another winding body 1114 is arranged around the multiple winding grooves 11113 of the other core 1111, and the winding body 1114 is a distributed winding body, and the winding body 1114 includes a winding 11141 arranged around the winding grooves 11113, and the winding 11141 is a flat rectangular wire.The multiple teeth portions 11111 of the two iron cores 1111 are integrally connected by an injection-molded member 1112, and when the air gap sides of the two iron cores 1111 are installed back to back, the teeth portions 11111 of the two iron cores 1111 are installed in close contact along the axial direction of the stator assembly 111.

[0117] In a second embodiment, referring together with Figures 4 to 6, the embodiment of the present application provides an axial flux motor 11 including a stator assembly 111 of any of the above embodiments.

[0118] The axial flux motor 11 according to the embodiment of this application employs the stator assembly 111 of any of the above embodiments, thereby effectively simplifying the assembly process of the axial flux motor 11.

[0119] In some embodiments of this application, referring to Figure 6, the axial flux motor 11 further includes a rotor 112, which is installed between the two cores 1111 and coaxially with the two cores 1111 when the air gap sides of the two cores 1111 are installed facing each other.

[0120] In other words, in this embodiment, the axial flux motor 11 is a single-rotor axial flux motor.

[0121] By adopting the above technical proposal, the assembly process for single-rotor axial-flux motors is effectively simplified.

[0122] In some embodiments of this application, with reference to Figures 4 and 5 together, the axial flux motor 11 further includes two rotors 112, where the air gap sides of two iron cores 1111 are installed back-to-back, one rotor 112 is installed facing the air gap side of one iron core 1111, and the other rotor 112 is installed facing the air gap side of the other iron core 1111.

[0123] In other words, in this embodiment, the axial flux motor 11 is a dual-rotor axial flux motor.

[0124] By adopting the above technical proposal, the assembly process of the dual-rotor axial flux motor is effectively simplified.

[0125] According to a third aspect, referring to Figure 3, an embodiment of the present application provides an electric drive device 10 including an axial magnetic flux motor 11 of any of the above embodiments.

[0126] The electric drive device 10 according to the embodiment of this application employs the axial magnetic flux motor 11 of any of the above embodiments, thereby effectively simplifying the assembly process of the electric drive device 10.

[0127] According to a fourth aspect, referring to Figure 1, an embodiment of the present application provides an electric drive system 100 comprising a battery 20 and the above-mentioned electric drive device 10, wherein the battery 20 is electrically connected to the electric drive device 10.

[0128] The electric drive system 100 according to the embodiment of this application uses the electric drive device 10 of any of the above embodiments, thereby effectively simplifying the assembly process of the electric drive system 100.

[0129] According to a fifth aspect, with reference to Figure 1, an embodiment of the present application provides an electric device including the electric drive system 100.

[0130] The electric equipment according to the embodiment of this application employs the electric drive system 100 of any of the above embodiments, thereby effectively simplifying the assembly process of the electric equipment.

[0131] The foregoing is merely a preferred embodiment of the present application and is not intended to limit it. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should all be included within the scope of protection of the present application. [Explanation of Symbols]

[0132] 1000: Vehicles, 100: Electric drive system, 10: Electric drive unit, 11: Axial flux motor, 111: Stator assembly, 1111: Iron core, 11111: Teeth section, 11112: Yoke section, 11113: Winding groove, 11114: First open end, 11115: Second open end, 11116: First radial line, 11117: Second radial line, 11118: Inlet, 1112: Injection molded part, 1113: Stator housing, 1114: Winding body, 11141: Winding, 112: Rotor, 113: Housing, 114: Magnetic path, 12: Controller, 13: Speed ​​change mechanism, 20:Battery, 21: Enclosure, 211: First part, 212: Second part, 22: Battery cell.

Claims

1. A stator assembly for application in an axial flux motor, wherein the stator assembly includes two cores, the air gap sides of the two cores are installed facing each other or back-to-back, a plurality of winding grooves are provided on the air gap sides of the cores surrounding the central axis of the stator assembly, the projection of the cores along the axial direction of the stator assembly is a first projection, and in the first projection, the longitudinal direction of the winding grooves is inclined with respect to the radial direction of the cores.

2. The stator assembly according to claim 1, wherein the projection of the stator assembly along the axial direction of the stator assembly is a second projection, and in the second projection, the plurality of winding grooves of one core intersects with the plurality of winding grooves of another core in a one-to-one correspondence.

3. The stator assembly according to claim 1 or 2, characterized in that the number of winding grooves in the core is N, one end of each winding groove penetrates the inner circumferential wall of the core to form a first open end, the other end of each winding groove penetrates the outer circumferential wall of the core to form a second open end, in the first projection, the center of the core is connected to the midpoint of the first open end to form a first radial line, the center of the core is connected to the midpoint of the second open end to form a second radial line, and the angle between the first radial line and the second radial line is θ, where 180° / N ≤ θ ≤ 360° / N.

4. The stator assembly according to claim 3, characterized in that, in the first projection, each of the angles θ is the same, and the angles θ of the two iron cores are the same.

5. The stator assembly according to any one of claims 1 to 4, further comprising an injection-molded member, wherein the core comprises a plurality of teeth, the plurality of teeth are spaced apart along the circumferential direction of the stator assembly to form a plurality of winding grooves, and the plurality of teeth are connected by the injection-molded member.

6. The stator assembly according to claim 5, characterized in that the plurality of teeth portions of the two iron cores are integrally connected by the injection-molded member.

7. The stator assembly according to claim 6, characterized in that when the air gap sides of the two iron cores are installed back to back, the teeth portions of the two iron cores are installed in close contact along the axial direction of the stator assembly.

8. The stator assembly according to any one of claims 1 to 4, wherein the iron core includes a yoke portion and a plurality of teeth portions installed on the yoke portion, the plurality of teeth portions are installed at intervals along the circumferential direction of the stator assembly to form a plurality of winding grooves, and when the air gap sides of the two iron cores are installed back to back, the yoke portions of the two iron cores are a single integrated member.

9. The stator assembly according to any one of claims 1 to 8, further comprising two sets of winding bodies, the winding bodies comprising windings arranged circumferentially within the winding grooves, and the windings being flat rectangular wires.

10. The stator assembly according to any one of claims 1 to 8, further comprising two sets of windings, wherein the windings are arranged circumferentially within the winding grooves, and the windings are dispersed windings.

11. The stator assembly according to any one of claims 1 to 10, characterized in that a plurality of inlets are provided on the air gap side of the iron core, the plurality of inlets communicate with a plurality of winding grooves in a one-to-one correspondence, and the width of the inlets is smaller than the width of the winding grooves.

12. The stator assembly according to any one of claims 1 to 11, further comprising a stator housing for housing a cooling medium, wherein the iron core is housed within the stator housing.

13. An axial magnetic flux motor characterized by comprising a stator assembly according to any one of claims 1 to 12.

14. The axial magnetic flux motor according to claim 13, further comprising a rotor, wherein when the air gap sides of the two iron cores are installed facing each other, the rotor is installed between the two iron cores and coaxially with the two iron cores.

15. The axial magnetic flux motor according to claim 13, further comprising two rotors, wherein when the air gap sides of the two iron cores are installed back-to-back, one rotor is installed facing the air gap side of one iron core, and the other rotor is installed facing the air gap side of the other iron core.

16. An electric drive device characterized by including an axial magnetic flux motor according to any one of claims 13 to 15.

17. An electric drive system, wherein the electric drive system includes a battery and an electric drive device according to claim 16, and the battery is electrically connected to the electric drive device.

18. An electric device characterized by including the electric drive system described in claim 17.

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