Stator assembly, axial magnetic flux motor, electric driving device, system and electric equipment

Abstract

The invention provides a stator assembly, an axial magnetic flux motor, an electric driving device, a system and electric equipment.The stator assembly comprises two iron cores, the air gap sides of the two iron cores are oppositely arranged or oppositely arranged, and the air gap sides of the iron cores are provided with a plurality of winding grooves arranged around the central axis of the stator assembly; the projection of the iron core in the axial direction of the stator assembly is a first projection, and in the first projection, the length direction of the winding grooves and the radial direction of the iron core are relatively inclined. According to the stator assembly provided by the embodiment of the invention, the inclination amplitudes of the winding grooves of the two iron cores are the same and the inclination directions are opposite, so that the magnetic flux can be alternately transmitted between the two iron cores, the armature reaction of the axial magnetic flux motor is effectively weakened, the eddy current loss of the axial magnetic flux motor is effectively inhibited, and the service life of the axial magnetic flux motor is prolonged. Compared with a mode that two windings adopt different winding structures, the stator assembly has the advantages that the two windings of the stator assembly can adopt the same winding structure, so that the manufacturing and assembling processes of the axial magnetic flux motor are effectively simplified.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and more specifically, to a stator assembly, an axial flux motor, an electric drive device, a system and an electric device. Background Art

[0002] Axial flux motors are motors with axial magnetic flux direction. As the axial dimension of axial flux motors is small, they are becoming more and more popular. The stator assembly of axial flux motors usually includes two stators. In order to reduce the eddy current loss of axial flux motors, the two stators usually adopt different winding structures, which makes the assembly process of axial flux motors very complicated. Therefore, how to simplify the assembly process of axial flux motors is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a stator assembly, an axial flux motor, an electric drive device, a system and an electric device to solve the technical problem of complex assembly process of the axial flux motor in the related art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is: to provide a stator assembly, which is applied to an axial flux motor, and the stator assembly includes two iron cores, and the air gap sides of the two iron cores are arranged opposite to each other or back to back. The air gap sides of the iron cores are provided with a plurality of winding grooves arranged around the central axis of the stator assembly, and the projection of the iron core along the axial direction of the stator assembly is a first projection. In the first projection, the length direction of the winding groove is relatively inclined to the radial direction of the iron core.

[0005] The stator assembly provided by the embodiment of the present application has at least the following beneficial effects: the two iron cores of the stator assembly provided by the embodiment of the present application are arranged opposite to each other or back to back, and a plurality of winding slots are opened on the air gap side of the iron core. In the axial projection of the iron core along the stator assembly, the length direction of the winding slots is relatively inclined to the radial direction of the iron core, so that the winding slots of the two iron cores have the same inclination amplitude and opposite inclination direction. In this way, the magnetic flux can be transmitted alternately between the two iron cores, so that the part of the magnetic circuit of the axial flux motor located between the two iron cores extends in a zigzag structure, effectively increasing the magnetic circuit length of the axial flux motor, thereby effectively weakening the armature reaction of the axial flux motor, and then effectively suppressing the eddy current loss of the axial flux motor. Compared with the method of using different winding structures for the two groups of windings, the two groups of windings of the stator assembly provided by the embodiment of the present application can use the same winding structure, thereby effectively simplifying the manufacturing and assembly process of the axial flux motor.

[0006] In some embodiments of the present application, a projection of the stator assembly along the axial direction of the stator assembly is a second projection, and in the second projection, a plurality of winding slots of one iron core and a plurality of winding slots of another iron core are intersected and arranged in a one-to-one correspondence.

[0007] By adopting the above technical solution, the magnetic path length of the stator assembly is further increased, so that the magnetic field can be more evenly distributed between the two iron cores, effectively reducing the gradient of the magnetic field of the axial flux motor, thereby further weakening the armature reaction of the axial flux motor, and further suppressing the eddy current loss of the axial flux motor.

[0008] In some embodiments of the present application, the number of winding grooves of the iron core is N, one end of the winding groove passes through the inner circumferential wall of the iron core to form a first open end, and the other end of the winding groove passes through the outer circumferential wall of the iron core to form a second open end. In the first projection, the center of the iron core is connected to the midpoint of the first open end to form a first radial line, and the center of the iron core is connected to the midpoint of the second open end to form a second radial line. The angle between the first radial line and the second radial line is θ, where 180° / N≤θ≤360° / N.

[0009] By adopting the above technical solution, the inclination angle of the winding slot can be limited within a reasonable range. In this way, not only the torque loss of the axial flux motor can be reduced, but also the torque pulsation of the axial flux motor can be effectively suppressed, thereby effectively improving the stability of the axial flux motor.

[0010] In some embodiments of the present application, in the first projection, each angle θ is the same, and the angles θ of the two cores are the same.

[0011] By adopting the above technical solution, the working stability of the axial flux motor is effectively improved.

[0012] In some embodiments of the present application, the stator assembly further includes an injection molded part, the core includes a plurality of teeth, the plurality of teeth are spaced apart along the circumference of the stator assembly to form a plurality of winding slots, and the plurality of teeth are connected by the injection molded part.

[0013] By adopting the above technical solution, there is no need to additionally provide a yoke on the iron core, so the magnetic impedance of the stator assembly can be reduced, thereby effectively improving the magnetic saturation phenomenon of the stator assembly.

[0014] In some embodiments of the present application, multiple teeth of two cores are connected into one piece through injection molding.

[0015] By adopting the above technical solution, the above injection molded part can be directly formed by the injection molding process and multiple teeth of the two cores can be connected together, thereby effectively simplifying the assembly process of the stator assembly and further simplifying the assembly process of the axial flux motor.

[0016] In some embodiments of the present application, when the air gap sides of the two cores are arranged opposite to each other, the teeth of the two cores are arranged in close contact along the axial direction of the stator assembly.

[0017] By adopting the above technical solution, the axial size of the stator assembly is effectively reduced, thereby effectively reducing the volume of the axial flux motor.

[0018] In some embodiments of the present application, the iron core includes a yoke and a plurality of teeth arranged on the yoke, the plurality of teeth being arranged at intervals along the circumference of the stator assembly to form a plurality of winding slots, and when the air gap sides of the two iron cores are arranged back to back, the yokes of the two iron cores are an integral component.

[0019] By adopting the above technical solution, the teeth of the two cores can share a yoke, thereby effectively simplifying the assembly process of the stator assembly and further simplifying the assembly process of the axial flux motor.

[0020] In some embodiments of the present application, the stator assembly further includes two groups of windings, the windings include windings wound in winding slots, and the windings are flat wires.

[0021] By adopting the above technical solution, the filling factor of the winding in the winding slot is effectively improved, thereby effectively improving the working efficiency of the axial flux motor.

[0022] In some embodiments of the present application, the stator assembly further includes two sets of windings, the windings are wound in winding slots, and the windings are distributed windings.

[0023] 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 harmonics and further suppressing the eddy current loss of the axial flux motor.

[0024] In some embodiments of the present application, a plurality of wire inlets are provided on the air gap side of the iron core, the plurality of wire inlets are connected to the plurality of winding grooves in a one-to-one correspondence, and the width of the wire inlets is smaller than the width of the winding grooves.

[0025] By adopting the above technical solution, the winding can be effectively confined in the winding slot, thereby effectively reducing the risk of the winding escaping from the winding slot and improving the reliability of the axial flux motor.

[0026] In some embodiments of the present application, the stator assembly further includes a stator shell for accommodating a cooling medium, and the iron core is accommodated in the stator shell.

[0027] By adopting the above technical solution, the heat generated by the stator assembly during operation 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.

[0028] An embodiment of the present application also provides an axial flux motor, comprising a stator assembly of any of the above embodiments.

[0029] The axial flux motor provided by the embodiment of the present application has at least the following beneficial effects: Since the axial flux motor provided by the embodiment 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.

[0030] In some embodiments of the present application, the axial flux motor further includes a rotor, and 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.

[0031] By adopting the above technical solution, the assembly process of the single-rotor axial flux motor is effectively simplified.

[0032] In some embodiments of the present application, the axial flux motor further comprises two rotors. When the air gap sides of the two cores are arranged back to back, one rotor is arranged opposite to the air gap side of one core, and the other rotor is arranged opposite to the air gap side of the other core.

[0033] By adopting the above technical solution, the assembly process of the dual-rotor axial flux motor is effectively simplified.

[0034] An embodiment of the present application also provides an electric drive device, comprising the axial flux motor of any one of the above embodiments.

[0035] The electric drive device provided by the embodiment of the present application has at least the following beneficial effects: Since the electric drive device provided by the embodiment 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.

[0036] An embodiment of the present application further provides an electric drive system, comprising a battery and the above-mentioned electric drive device, wherein the battery is electrically connected to the electric drive device.

[0037] The electric drive system provided by the embodiment of the present application has at least the following beneficial effects: Since the electric drive system provided by the embodiment of the present application adopts the electric drive device of any of the above embodiments, the assembly process of the electric drive system is effectively simplified.

[0038] An embodiment of the present application also provides an electric device, comprising the above-mentioned electric drive system.

[0039] The electric device provided by the embodiments of the present application has at least the following beneficial effects: Since the electric device provided by the embodiments of the present application adopts the electric drive system of any of the above embodiments, the assembly process of the electric device is effectively simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the explosion structure of a battery provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of an electric drive device provided in an embodiment of the present application;

[0044] Figure 4 A schematic diagram of the structure of an axial flux motor provided by an embodiment of the present application;

[0045] Figure 5 A schematic diagram of the structure of an axial flux motor provided by another embodiment of the present application;

[0046] Figure 6 A schematic diagram of the structure of an axial flux motor provided by another embodiment of the present application;

[0047] Figure 7 A schematic structural diagram of a first projection of an iron core provided in an embodiment of the present application;

[0048] Figure 8 A schematic structural diagram of a second projection of a stator assembly provided in an embodiment of the present application;

[0049] Fig. 9 A schematic diagram of the assembly structure of the core and winding in the stator assembly provided in an embodiment of the present application;

[0050] Fig.10 for Fig. 9 The cross-sectional structural diagram of the winding shown is that the winding wire is placed in the winding slot of the iron core.

[0051] Among them, the reference numerals in the figure are:

[0052] 1000. Vehicles;

[0053] 100. Electric drive system;

[0054] 10. Electric drive device;

[0055] 11. Axial flux motor; 111. stator assembly; 1111. core; 11111. tooth portion; 11112. yoke portion; 11113. winding slot; 11114. first opening end; 11115. second opening end; 11116. first radial line; 11117. second radial line; 11118. wire inlet; 1112. injection molded part; 1113. stator housing; 1114. winding; 11141. winding; 112. rotor; 113. housing; 114. magnetic circuit; 12. controller; 13. speed change mechanism;

[0056] 20. Battery;

[0057] 21, box body; 211, first part; 212, second part;

[0058] 22. Battery cell. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0061] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] The motor is the power device of the electric equipment. The motor is used to convert electrical energy into mechanical energy to drive the electric equipment. Among them, the axial flux motor refers to a motor in which the magnetic flux direction is axial and the current-carrying conductor is placed radially. The stator assembly of the axial flux motor usually includes two cores and two sets of windings. The air gap side of the core is provided with multiple winding slots. One set of windings is wound in the winding slots of one core, and the other set of windings is wound in the winding slots of the other core.

[0064] In the related art, the length direction of the winding slots of the core is parallel to the radial direction of the core, and the winding slots of the two cores are arranged opposite to each other or back to back. If the two sets of windings use the same winding structure, the magnetic circuit of the axial flux motor located between the two cores will extend roughly in a straight line structure, which will shorten the magnetic circuit of the axial flux motor, thereby enhancing the armature reaction of the axial flux motor and increasing the eddy current loss of the axial flux motor. In order to suppress the eddy current loss of the axial flux motor, manufacturers usually use different winding structures for the two sets of windings, but this will complicate the assembly process of the axial flux motor, thereby greatly increasing the difficulty of assembling the axial flux motor and reducing the assembly efficiency of the axial flux motor.

[0065] In order to suppress the eddy current loss of the axial flux motor and simplify the assembly process of the axial flux motor, the two iron cores of the stator assembly provided in the embodiment of the present application are arranged relative to or back to back, and a plurality of winding grooves are opened on the air gap side of the iron core. In the axial projection of the iron core along the stator assembly, the length direction of the winding groove is relatively inclined to the radial direction of the iron core, so that the winding grooves of the two iron cores have the same inclination amplitude and opposite inclination direction. In this way, the magnetic flux can be transmitted alternately between the two iron cores, so that the part of the magnetic circuit of the axial flux motor located between the two iron cores extends in a zigzag structure, effectively increasing the magnetic circuit length of the axial flux motor, thereby effectively weakening the armature reaction of the axial flux motor, and further effectively suppressing the eddy current loss of the axial flux motor. Compared with the method of using different winding structures for the two groups of windings, the two groups of windings of the stator assembly provided in the embodiment of the present application can use the same winding structure, thereby effectively simplifying the assembly process of the axial flux motor.

[0066] The axial flux motor provided in the embodiments of the present application can be applied to electric devices, which may be, but are not limited to, vehicles, portable devices, ships, spacecraft, electric toys, and electric tools, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0067] For the convenience of description, the following embodiments are described by taking the electric device of one embodiment of the present application as a vehicle as an example.

[0068] See also Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in the embodiment of the present 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.

[0069] The vehicle body is the main supporting component of the vehicle 1000, and the vehicle body has a cabin and a driving cabin, wherein the cabin is used to accommodate the power mechanism, electric control mechanism, transmission mechanism, etc. of the vehicle 1000, and the driving cabin is used to provide operating space and riding space for the driver and passengers. When the vehicle 1000 is a front-wheel drive vehicle, the cabin is arranged at the head of the vehicle body, that is, the cabin is the front cabin; when the vehicle 1000 is a rear-wheel drive vehicle, the cabin is arranged at the rear of the vehicle body, that is, the cabin is the rear cabin; when the vehicle 1000 is a four-wheel drive vehicle, the cabin is divided into a front cabin and a rear cabin, the front cabin is arranged at the head of the vehicle body, and the rear cabin is arranged at the rear of the vehicle body. The driving cabin is arranged between the head and the rear of the vehicle body.

[0070] The electric drive system 100 is a power system of the vehicle 1000, and is used to convert electrical energy into mechanical energy and output the mechanical energy to the wheels of the vehicle 1000 to drive the vehicle 1000. The electric drive system 100 is disposed on the vehicle body, and specifically, a part of the electric drive system 100 can be disposed in the cabin, and another part of the electric drive system 100 can be disposed at the bottom of the vehicle body.

[0071] See also Figure 1 The electric drive system 100 provided in the embodiment of the present application includes an electric drive device 10 and a battery 20 .

[0072] The electric drive device 10 is used to convert the electrical energy provided by the battery 20 into mechanical energy and output the mechanical energy to the wheels of the vehicle 1000 to drive the vehicle 1000. When kinetic energy is recovered, the electric drive device 10 acts as a generator to convert mechanical energy into electrical energy and transmit the generated electrical energy to the battery 20 for storage. The electric drive device 10 is installed in the cabin. Specifically, when the vehicle 1000 is a front-wheel drive vehicle, the electric drive device 10 is arranged at the front of the vehicle 1000 and is used to output the above-mentioned mechanical energy to the front wheels of the vehicle 1000 to drive the vehicle 1000 to travel; when the vehicle 1000 is a rear-wheel drive vehicle, the electric drive device 10 is arranged at the rear of the vehicle 1000 and is used to output the above-mentioned mechanical energy to the rear wheels of the vehicle 1000 to drive the vehicle 1000 to travel; when the vehicle 1000 is a four-wheel drive vehicle, there can be two electric drive devices 10, one electric drive device 10 is arranged at the front of the vehicle 1000 and is used to output the above-mentioned mechanical energy to the front wheels of the vehicle 1000, and the other electric drive device 10 is arranged at the rear of the vehicle 1000 and is used to output the above-mentioned mechanical energy to the rear wheels of the vehicle 1000 to drive the vehicle 1000 to travel.

[0073] The battery 20 is used to provide electric energy for the electric drive device 10. The battery 20 can be arranged at the bottom, head or tail of the vehicle 1000. Figure 2 , Figure 2 Schematic diagram of an explosion of a battery 20 provided in an embodiment of the present application. The battery 20 includes a box 21 and a battery cell 22, and the battery cell 22 is contained in the box 21. Among them, the box 21 is used to provide a storage space for the battery cell 22, and the box 21 can adopt a variety of structures. In some embodiments, the box 21 may include a first part 211 and a second part 212, and the first part 211 and the second part 212 cover each other, and the first part 211 and the second part 212 jointly define a storage space for accommodating the battery cell 22. The second part 212 can be a hollow structure with one end open, and the first part 211 can be a plate-like structure. The first part 211 is covered on the open side of the second part 212, so that the first part 211 and the second part 212 jointly define a storage space; the first part 211 and the second part 212 can also be hollow structures with one side open, and the open side of the first part 211 is covered on the open side of the second part 212. Of course, the box body 21 formed by the first part 211 and the second part 212 can be in various shapes, such as a cylinder, a cuboid, etc.

[0074] In some embodiments, the box 21 may be a part of the chassis structure of the vehicle 1000. For example, part of the box 21 may become at least a part of the floor of the vehicle 1000, or part of the box 21 may become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0075] Of course, in some embodiments, the battery 20 may not include the box body 21 , but instead a plurality of battery cells 22 may be electrically connected and formed into a whole through necessary fixing structures and then assembled into the vehicle 1000 .

[0076] 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 a mixed connection. A mixed connection means that the multiple battery cells 22 are both connected in series and in parallel. The multiple battery cells 22 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 22 is accommodated in the box 21. Of course, the battery 20 may also be a battery module formed by connecting multiple battery cells 22 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 21. The battery 20 may also include other functional components, for example, the battery 20 may also include a busbar for realizing electrical connection between the multiple battery cells 22.

[0077] Each battery cell 22 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 22 that can be used continuously by activating the active material by charging after the battery cell 22 is discharged, and a primary battery refers to a battery cell 22 that cannot be used continuously by activating the active material by charging after the power of the battery cell 22 is exhausted; the battery cell 22 may also be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., but is not limited thereto. The battery cell 22 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell 22 of other shapes, wherein the prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell, wherein the multi-prismatic battery cell is, for example, a hexagonal battery cell, etc., and the present application has no particular restrictions.

[0078] See also Figure 3The electric drive device 10 includes an axial flux motor 11, which is the main power output component of the electric drive device 10 and is used to convert the electrical energy provided by the battery 20 into mechanical energy. The number of the axial flux motors 11 can be one or more. In some embodiments, the number of the axial flux motors 11 is two, and the two axial flux motors 11 are coaxially arranged, that is, the central axes of the two axial flux motors 11 coincide with each other. The electric drive device 10 may further include a speed change mechanism 13, which is a power transmission mechanism of the electric drive device 10. The speed change mechanism 13 has a power input end and a power output end. The power input end of the speed change mechanism 13 is connected to the rotating shaft of the axial flux motor 11, and the power output end of the speed change mechanism 13 is connected to the wheels of the vehicle 1000. The speed change mechanism 13 transfers the above-mentioned mechanical energy to the wheels of the vehicle 1000 by changing the speed and torque input by the axial flux motor 11. For example, the speed change mechanism 13 transfers the above-mentioned mechanical energy to the wheels of the vehicle 1000 by reducing the output speed and increasing the torque relative to the input of the axial flux motor 11. For another example, the speed change mechanism 13 transfers the above-mentioned mechanical energy to the wheels of the vehicle 1000 by increasing the output speed and reducing the torque relative to the input of the axial flux motor 11. Of course, in other embodiments, the speed change mechanism 13 can also be used to change the direction of the output shaft of the electric drive device 10 relative to the output shaft of the axial flux motor 11, for example, a bevel gear or a worm gear structure is used to connect the output shaft of the axial flux motor 11 and further change the direction of the torque output. Optionally, the speed change mechanism 13 can be but not limited to a gear shaft speed change mechanism, a worm gear speed change mechanism, a planetary gear speed change mechanism, a stepless speed change mechanism, etc., which are not specifically limited here. The electric drive device 10 can also include a controller 12, which is used to convert the direct current output by the battery 20 into alternating current and transmit the alternating current to the axial flux motor 11, and is also used to control the operation of the axial flux motor 11, for example, to control the start and stop, speed, torque, etc. of the axial flux motor 11. Of course, in other embodiments, the controller 12 can also be used to rectify the alternating current generated by the rotation of the axial flux motor 11 into direct current, and transmit it to the battery 20 to realize the kinetic energy recovery function of the vehicle 1000.

[0079] Please also refer to 4 to Figure 6The axial flux motor 11 includes a stator assembly 111 and a rotor 112. The rotor 112 is the rotating part of the axial flux motor 11, and the stator assembly 111 is the fixed part of the axial flux motor 11. The axial flux motor 11 may also include a housing 113, and the housing 113 is used to provide an installation environment for the stator assembly 111 and the rotor 112, and is also used as a supporting component of the axial flux motor 11. Optionally, the housing 113 may be an integrally formed component, or an assembled component assembled from multiple parts. The material of the housing 113 may be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and is not specifically limited here.

[0080] The stator assembly 111 provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0081] First, please also refer to Figures 4 to 7 An embodiment of the present application provides a stator assembly 111, including two iron cores 1111, the air gap sides of the two iron cores 1111 are arranged opposite to each other or back to back, the air gap sides of the iron cores 1111 are provided with a plurality of winding grooves 11113 arranged around the central axis of the stator assembly 111, and the projection of the iron cores 1111 along the axial direction of the stator assembly 111 is a first projection. In the first projection, the length direction of the winding grooves 11113 is relatively inclined to the radial direction of the iron core 1111.

[0082] The iron core 1111 is an important component of the magnetic circuit 114 of the axial flux motor 11. The iron core 1111, the rotor 112, and the air gap between the iron core 1111 and the rotor 112 together constitute the magnetic circuit 114 of the axial flux motor 11. In some embodiments, the iron core 1111 can be an assembled component assembled from multiple parts, for example, the iron core 1111 is formed by stacking multiple punching sheets. In other implementations, the iron core 1111 can also be an integrally formed component, for example, the iron core 1111 is integrally formed by a casting process.

[0083] The air gap side of the iron core 1111 refers to the side of the iron core 1111 facing the rotor 112 and spaced apart from the rotor 112. The air gap side of the iron core 1111 is spaced apart from the rotor 112 to form an air gap. The air gap sides of the two iron cores 1111 can be arranged opposite to each other or opposite to each other. Figure 4 and Figure 5 , the air gap sides of the two iron cores 1111 are arranged opposite to each other. In this embodiment, the number of rotors 112 of the axial flux motor 11 is two, the air gap side of one iron core 1111 is arranged opposite to one rotor 112, and the air gap side of the other iron core 1111 is arranged opposite to the other rotor 112. In other words, the stator assembly 111 is arranged between the two rotors 112. In another embodiment, please refer to Figure 6The air gap sides of the two iron cores 1111 are arranged relative to each other. In the present embodiment, the number of the rotor 112 of the axial flux motor 11 is one. The air gap side of one iron core 1111 is arranged relative to one axial side of the rotor 112, and the air gap side of the other iron core 1111 is arranged relative to the other axial side of the rotor 112. In other words, the rotor 112 is arranged between the two iron cores 1111.

[0084] The winding slots 11113 are used to provide a space for accommodating the windings 1114. In some embodiments, the core 1111 includes a plurality of teeth 11111, which are arranged at intervals around the central axis of the stator assembly 111 to form a plurality of winding slots 11113. It can be understood that one end of the winding slot 11113 penetrates the inner circumferential wall of the core 1111 to form a first open end 11114, and the other end of the winding slot 11113 penetrates the outer circumferential wall of the core 1111 to form a second open end 11115. The number of winding slots 11113 can be determined according to actual application needs. For example, the number of winding slots 11113 can be 18, 24, 36, etc., which are not specifically limited here.

[0085] The stator assembly 111 also includes two groups of windings 1114, one group of windings 1114 is wound in the winding slots 11113 of one iron core 1111, and the other group of windings 1114 is wound in the winding slots 11113 of the other iron core 1111. When the windings 1114 are energized, the stator assembly 111 generates an electromagnetic field, which is magnetically coupled with the rotor 112 to drive the rotor 112 to rotate. The winding 1114 can be, but is not limited to, an integer slot winding, a fractional slot winding, a centralized winding and a distributed winding, wherein an integer slot winding refers to a winding 1114 in which the number of winding slots 11113 occupied by each pole and each phase is an integer; a fractional slot winding refers to a winding 1114 in which the number of winding slots 11113 occupied by each pole and each phase is a fraction; a centralized winding refers to a winding 1114 in which all coils are concentrated on the same tooth portion 11111 of the iron core 1111, and both ends of the coils are connected to the same position through a wire to form a common connection point, and such a winding 1114 is called a centralized winding; a distributed winding refers to a winding in which each coil is distributed in a plurality of winding slots 11113, and adjacent coils are connected according to a certain phase difference, and such a winding 1114 is called a distributed winding.

[0086] For the convenience of description below, any plane perpendicular to the central axis of the stator assembly 111 is taken as a reference plane, and the winding slot 11113 can be arranged obliquely relative to the reference plane, or can be arranged parallel to the reference plane. The projection of the iron core 1111 on the reference plane is the first projection, in which the length direction of the winding slot 11113 is relatively inclined with respect to the radial direction of the iron core 1111, wherein the length direction of the winding slot 11113 refers to the length direction of the figure formed by the winding slot 11113 in the first projection, specifically, the direction from the first opening end 11114 to the second opening end 11115 or the direction from the second opening end 11115 to the first opening end 11114. In the first projection, the angle formed by the length direction of the winding slot 11113 and the radial direction of the iron core 1111 can be determined according to the actual application needs, and is not specifically limited here.

[0087] See also Figure 8 , the projection of the stator assembly 111 on the above-mentioned reference plane is the second projection. Since the two iron cores 1111 are arranged opposite to each other or back to back, and in the first projection, the length direction of the winding slots 11113 is relatively inclined with the radial direction of the iron core 1111, so that the winding slots 11113 of the two iron cores 1111 have the same inclination amplitude and opposite inclination direction, then in the second projection, a winding slot 11113 of one iron core 1111 and a winding slot 11113 of the other iron core 1111 adjacent to or relative to the aforementioned winding slot 11113 are grouped together, and in this group of winding slots 11113, at least the extended lines of the two winding slots 11113 intersect.

[0088] The two cores 1111 of the stator assembly 111 provided in the embodiment of the present application are arranged opposite to each other or opposite to each other, and a plurality of winding slots 11113 are provided on the air gap side of the core 1111. In the axial projection of the core 1111 along the stator assembly 111, the length direction of the winding slots 11113 is relatively inclined with respect to the radial direction of the core 1111, so that the winding slots 11113 of the two cores 1111 have the same inclination amplitude and opposite inclination direction, so that the magnetic flux can be alternately transmitted between the two cores 1111, such as Figures 4 to 7 As shown, the portion of the magnetic circuit 114 of the axial flux motor 11 located between the two iron cores 1111 extends in a zigzag structure, which effectively increases the length of the magnetic circuit 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 with the method in which the two groups of windings 1114 adopt different winding 11141 structures, the two groups of windings 1114 of the stator assembly 111 provided in the embodiment of the present application can adopt the same winding 11141 structure, thereby effectively simplifying the manufacturing and assembly process of the axial flux motor 11.

[0089] In some embodiments of this application, please refer to Figure 8 In the second projection, the multiple winding grooves 11113 of one iron core 1111 intersect and correspond to the multiple winding grooves 11113 of another iron core 1111 .

[0090] In other words, in the second projection, multiple winding grooves 11113 of one iron core 1111 are arranged in one-to-one correspondence with multiple winding grooves 11113 of another iron core 1111, and one winding groove 11113 of one iron core 1111 and one winding groove 11113 of the other iron core 1111 relative to the aforementioned winding groove 11113 are grouped together, and in this group of winding grooves 11113, the figures formed by two winding grooves 11113 in the second projection are arranged to intersect.

[0091] In some embodiments, a figure formed by the first open end 11114 of the winding slot 11113 of one iron core 1111 in the second projection intersects with a figure formed by the first open end 11114 of the winding slot 11113 of another iron core 1111 in the second projection, that is, in the second projection, the intersection of the winding slots 11113 of the two iron cores 1111 can be located on the first open end 11114 of the winding slot 11113.

[0092] In other embodiments, a figure formed by the second open end 11115 of the winding groove 11113 of one iron core 1111 in the second projection intersects with a figure formed by the second open end 11115 of the winding groove 11113 of another iron core 1111 in the second projection, that is, in the second projection, the intersection of the winding grooves 11113 of the two iron cores 1111 is located on the second open end 11115 of the winding groove 11113.

[0093] In some further embodiments, a figure formed by the middle part of the winding groove 11113 of one iron core 1111 in the second projection intersects with a figure formed by the middle part of the winding groove 11113 of another iron core 1111 in the second projection, that is, in the second projection, the intersection point of the winding grooves 11113 of the two iron cores 1111 is located in the middle part of the winding groove 11113.

[0094] By adopting the above technical solution, the length of the magnetic circuit 114 of the stator assembly 111 is further increased, so that the magnetic field can be more evenly distributed 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 the eddy current loss of the axial flux motor 11.

[0095] In some embodiments of this application, please refer to Figure 7, the number of winding grooves 11113 of the iron core 1111 is N. In the first projection, the center of the iron core 1111 is connected to the midpoint of the first open end 11114 of a winding groove 11113 to form a first radial line 11116, and the center of the iron core 1111 is connected to the midpoint of the second open end 11115 of the winding groove 11113 to form a second radial line 11117. The angle between the first radial line 11116 and the second radial line 11117 is θ, wherein 180° / N≤θ≤360° / N.

[0096] The midpoint of the first open end 11114 refers to the intersection of the midline of the figure formed by the winding groove 11113 in the first projection and the figure formed by the first open end 11114 in the first projection, and the first radial line 11116 passes through the center of the iron core 1111 and the midpoint of the first open end 11114. Similarly, the midpoint of the second open end 11115 refers to the intersection of the midline of the figure formed by the winding groove 11113 in the first projection and the figure formed by the second open end 11115 in the first projection, and the second radial line 11117 passes through the center of the iron core 1111 and the midpoint of the second open end 11115.

[0097] The angle formed by the first radial line 11116 and the second radial line 11117 is θ, wherein 180° / N≤θ≤360° / N. For example, the number of winding grooves 11113 of the iron core 1111 is 18, then N=18, 10°≤θ≤20°, such as θ=10°, θ=15°, θ=20°, etc.; for another example, the number of winding grooves 11113 of the iron core 1111 is 24, then N=24, 7.5°≤θ≤15°, such as θ=7.5°, θ=10°, θ=15°, etc.; for another example, the number of winding grooves 11113 of the iron core 1111 is 36, then N=36, 5°≤θ≤10°, such as θ=5°, θ=7.5°, θ=10°, etc.

[0098] In the second projection, the angle formed by the two first radial lines 11116 corresponding to the two intersecting winding grooves 11113 is α, when the intersection of the winding grooves 11113 of the two iron cores 1111 is located on the first open end 11114 of the winding grooves 11113, α=0, when the intersection of the winding grooves 11113 of the two iron cores 1111 is located on the second open end 11115 of the winding grooves 11113, α=2θ, when the intersection of the winding grooves 11113 of the two iron cores 1111 is located in the middle of the winding grooves 11113, 0≤α≤2θ.

[0099] In the related art, the torque of the axial flux motor 11 is inversely proportional to the inclination angle of the winding slot 11113 of the iron core 1111 relative to the radial direction of the iron core 1111, and the torque pulsation of the axial flux motor 11 is also inversely proportional to the inclination angle of the winding slot 11113 of the iron core 1111 relative to the radial direction of the iron core 1111, that is, the larger the inclination angle of the winding slot 11113 of the iron core 1111 relative to the radial direction of the iron core 1111, the smaller the torque of the axial flux motor 11, and the smaller the torque pulsation of the axial flux motor 11; conversely, the smaller the inclination angle of the winding slot 11113 of the iron core 1111 relative to the radial direction of the iron core 1111, the greater the torque of the axial flux motor 11, and the greater the torque pulsation of the axial flux motor 11.

[0100] By adopting the above technical solution, the inclination angle of the winding slot 11113 can be limited within a reasonable range. In this way, not only the torque loss of the axial flux motor 11 can be reduced, but also the torque pulsation of the axial flux motor 11 can be effectively suppressed, thereby effectively improving the stability of the axial flux motor 11.

[0101] In some embodiments of this application, please refer to Figure 7 In the first projection, each angle θ is the same, and the angle θ of the two cores 1111 is the same.

[0102] In other words, for one iron core 1111, the inclination angles of each winding groove 11113 relative to the corresponding first radial line 11116 are equal; for two iron cores 1111, the inclination angles of each winding groove 11113 of one iron core 1111 relative to the corresponding first radial line 11116 are equal to the inclination angles of each winding groove 11113 of the other iron core 1111 relative to the corresponding first radial line 11116, that is, the winding grooves 11113 of the two iron cores 1111 are the same.

[0103] By adopting the above technical solution, the working stability of the axial flux motor 11 is effectively improved.

[0104] In some embodiments of this application, please refer to Figure 4 The stator assembly 111 also includes an injection molded part 1112 , the iron core 1111 includes a plurality of teeth 11111 , the plurality of teeth 11111 are spaced apart along the circumference of the stator assembly 111 to form a plurality of winding slots 11113 , and the plurality of teeth 11111 are connected by the injection molded part 1112 .

[0105] The tooth portion 11111 is a protruding portion of the iron core 1111 . In the circumferential direction of the iron core 1111 , two adjacent tooth portions 11111 are spaced apart to form a winding groove 11113 .

[0106] The injection molded part 1112 is a component made by an injection molding process. In some embodiments, during the production process of the stator assembly 111, multiple teeth 11111 can be arranged in a circumferential direction and fixed with a fixing tool, and then the injection molded part 1112 is formed on the multiple teeth 11111 by an injection molding process to connect the multiple teeth 11111 into a whole. In other embodiments, during the production process of the stator assembly 111, multiple teeth 11111 can be arranged in a circumferential direction and fixed with a fixing tool, the winding 1114 is wound in each winding slot 11113, and then the injection molded part 1112 is formed on the whole assembled by the iron core 1111 and the winding 1114 by an injection molding process to connect the iron core 1111 and the winding 1114 into a whole.

[0107] By adopting the above technical solution, there is no need to additionally provide a yoke on the iron core 1111 , so the magnetic impedance of the stator assembly 111 can be reduced, thereby effectively improving the magnetic saturation phenomenon of the stator assembly 111 .

[0108] In some embodiments of this application, please refer to Figure 4 The multiple teeth 11111 of the two iron cores 1111 are connected into one by the injection molding part 1112.

[0109] In some embodiments, during the production process of the stator assembly 111, the multiple teeth 11111 of the two cores 1111 can be arranged in a circumferential direction and fixed with a fixing tool, and then the above-mentioned injection molded parts 1112 are formed on the multiple teeth 11111 of the two cores 1111 through an injection molding process to connect the multiple teeth 11111 of the two cores 1111 into a whole. In other embodiments, during the production process, the multiple teeth 11111 of the two iron cores 1111 can be arranged in a circumferential direction and fixed with a fixing tool, and the two groups of windings 1114 can be respectively wound in the respective winding slots 11113 of the corresponding iron cores 1111. Then, the above-mentioned injection molded part 1112 is formed on the whole assembled by the two iron cores 1111 and the two groups of windings 1114 through an injection molding process to connect the two iron cores 1111 and the two groups of windings 1114 into a whole.

[0110] By adopting the above technical solution, the above injection molded part 1112 can be directly formed by an injection molding process and multiple teeth 11111 of the two iron cores 1111 can be connected together, thereby effectively simplifying the assembly process of the stator assembly 111 and further simplifying the assembly process of the axial flux motor 11.

[0111] In some embodiments of this application, please refer to Figure 4When the air gap sides of the two iron cores 1111 are arranged back to back, the teeth 11111 of the two iron cores 1111 are arranged in close contact along the axial direction of the stator assembly 111 .

[0112] It can be understood that the present embodiment is applicable to a dual-rotor axial flux motor. In the present embodiment, the axial side of the tooth portion 11111 of one iron core 1111 fits with the axial side of the tooth portion 11111 of the other iron core 1111, that is, there is no gap between the teeth portions 11111 of the two iron cores 1111. Of course, taking into account the assembly tolerance, there may be a small gap between the teeth portions 11111 of the two iron cores 1111.

[0113] By adopting the above technical solution, the axial size of the stator assembly 111 is effectively reduced, thereby effectively reducing the volume of the axial flux motor 11.

[0114] In some embodiments of this application, please refer to Figure 5 The iron core 1111 also includes a yoke 11112, and a plurality of teeth 11111 are arranged on the yoke 11112. When the air gap sides of the two iron cores 1111 are arranged back to back, the yokes 11112 of the two iron cores 1111 are an integral component.

[0115] The yoke 11112 is a connecting part of the iron core 1111, and is used to connect the plurality of teeth 11111. The yoke 11112 is generally a disc-shaped structure, and the plurality of teeth 11111 are arranged on the yoke 11112 along the circumference of the iron core 1111. Figure 5 As shown, the yoke 11112 of the two cores 1111 is an integral component, which means that the yoke 11112 of the two cores 1111 forms a whole. In some embodiments, the yoke 11112 of the two cores 1111 can be formed by stacking a plurality of sheets to form a whole, and the plurality of teeth 11111 of one core 1111 are arranged on one axial side of the whole, and the plurality of teeth 11111 of the other core 1111 are arranged on the other axial side of the whole. In other embodiments, the yoke 11112 of the two cores 1111 can be made into a whole by a casting process, and the plurality of teeth 11111 of one core 1111 are arranged on one axial side of the whole, and the plurality of teeth 11111 of the other core 1111 are arranged on the other axial side of the whole, wherein the casting process can be but is not limited to a die casting process, a casting process, etc.

[0116] By adopting the above technical solution, the teeth 11111 of the two cores 1111 can share a yoke 11112, thereby effectively simplifying the assembly process of the stator assembly 111 and further simplifying the assembly process of the axial flux motor 11.

[0117] In some embodiments of this application, please refer to Fig. 9 and Fig.10 The winding 1114 includes a winding 11141 wound in a winding groove 11113, and the winding 11141 is a flat wire.

[0118] In this embodiment, the winding 11141 includes a plurality of line segments, each of which is prefabricated into a flat structure, and each line segment is placed in the winding slot 11113 and stacked in sequence along the depth direction of the winding slot 11113 until the winding slot 11113 is fully filled. It should be noted that the depth direction of the winding slot 11113 is a direction parallel to the axial direction of the stator assembly 111.

[0119] By adopting the above technical solution, the filling factor of the winding 1114 in the winding slot 11113 is effectively improved, thereby effectively improving the working efficiency of the axial flux motor 11.

[0120] Of course, in other embodiments, the winding 11141 may also be a round wire.

[0121] In some embodiments of the present application, the winding 1114 is a distributed winding.

[0122] By adopting the above technical solution, the asymmetry of the magnetic field waveform of the axial flux motor 11 can be effectively reduced, thereby effectively reducing the winding harmonics and further suppressing the eddy current loss of the axial flux motor 11.

[0123] In some embodiments of this application, please refer to Fig.10 A plurality of wire inlets 11118 are provided on the air gap side of the iron core 1111 , and the plurality of wire inlets 11118 are connected to the plurality of winding grooves 11113 in a one-to-one correspondence, and the width of the wire inlets 11118 is smaller than the width of the winding grooves 11113 .

[0124] The wire inlet 11118 is used to provide space for the winding wire 11141 of the winding 1114 to enter the winding slot 11113. The wire inlet 11118 penetrates the air gap side surface of the core 1111 to connect to the winding slot 11113. It can be understood that each wire inlet 11118 is connected to a winding slot 11113.

[0125] The width of the wire inlet 11118 refers to the size of the wire inlet 11118 along the circumference of the iron core 1111. Similarly, the width of the winding slot 11113 refers to the size of the winding slot 11113 along the circumference of the iron core 1111. During the production process of the stator assembly 111, the winding 11141 of the winding 1114 is placed into the winding slot 11113 through the wire inlet 11118. After the winding 11141 of the winding 1114 is wound multiple times, a coil is formed. After the coil fully fills the winding slot 11113, since the width of the wire inlet 11118 is smaller than the width of the winding slot 11113, it is difficult for the coil to escape from the winding slot 11113 through the wire inlet 11118.

[0126] By adopting the above technical solution, the winding 1114 can be effectively confined in the winding slot 11113, thereby effectively reducing the risk of the winding 1114 escaping from the winding slot 11113 and improving the reliability of the axial flux motor 11.

[0127] In some embodiments of this application, please refer to Figures 4 to 6 The stator assembly 111 also includes a stator shell 1113 for accommodating a cooling medium, and the iron core 1111 is accommodated in the stator shell 1113 .

[0128] The stator case 1113 is used to provide an internal environment for the stator assembly 111. Optionally, the stator case 1113 may be an integrally formed component or an assembled component assembled from a plurality of parts. The material of the stator case 1113 may be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specifically limited herein. In some embodiments, when the stator case 1113 includes a plurality of parts, some parts of the stator case 1113 may be made of metal materials such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and other parts of the stator case 1113 may be made of plastic, which is not specifically limited herein.

[0129] The cooling medium is a medium used to absorb the heat generated by the stator assembly 111. It can be understood that the iron core 1111 and the winding 1114 are accommodated in the stator shell 1113 and in contact with the cooling medium, so that the heat generated by the iron core 1111 and the heat generated by the winding 1114 are directly transferred to the cooling medium, thereby achieving the purpose of cooling the iron core 1111 and the winding 1114. In some embodiments, the cooling medium can be statically accommodated in the stator shell 1113. In other embodiments, the stator shell 1113 is provided with a liquid inlet and a liquid outlet, and the cooling medium can enter the stator shell 1113 through the liquid inlet and leave the stator shell 1113 through the liquid outlet, so that the cooling medium can cool the stator assembly 111 in a circulating flow. Optionally, the cooling medium can be but not limited to cooling oil, cooling water, etc., which is not specifically limited here.

[0130] In some embodiments, when the air gap sides of the two iron cores 1111 are arranged back to back, the number of the stator shell 1113 can be one, and the two iron cores 1111 are accommodated in the same stator shell 1113 .

[0131] In other embodiments, when the air gap sides of the two iron cores 1111 are arranged opposite to each other, the number of the stator shells 1113 can be two, one iron core 1111 is accommodated in one stator shell 1113, and the other iron core 1111 is accommodated in the other stator shell 1113.

[0132] By adopting the above technical solution, the heat generated by the stator assembly 111 during operation 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 flux motor 11.

[0133] In some embodiments of this application, please refer to Figure 4 as well as Figures 7 to 10The stator assembly 111 includes an injection molded part 1112, two iron cores 1111 and two sets of windings 1114. The air gap sides of the two iron cores 1111 are arranged opposite to each other or opposite to each other. The iron core 1111 includes a plurality of teeth 11111, and the plurality of teeth 11111 are arranged at intervals around the central axis of the stator assembly 111 to form a plurality of winding slots 11113. One end of the winding slot 11113 penetrates the inner peripheral wall of the iron core 1111 to form a first open end 11114, and the other end of the winding slot 11113 penetrates the outer peripheral wall of the iron core 1111 to form a second open end 11115. The projection of the iron 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 length direction of the winding groove 11113 is relatively inclined with respect to the radial direction of the iron core 1111, the center of the iron core 1111 is connected with the midpoint of the first open end 11114 to form a first radial line 11116, the center of the iron core 1111 is connected with the midpoint of the second open end 11115 to form a second radial line 11117, the angle between the first radial line 11116 and the second radial line 11117 is θ, the number of the winding grooves 11113 of the iron core 1111 is N, wherein 180° / N≤θ≤360° / N. In the second projection, the multiple winding grooves 11113 of one iron core 1111 are intersected with the multiple winding grooves 11113 of another iron core 1111 in a one-to-one correspondence; the intersection includes the intersection of the projections of the two winding grooves 11113, or the intersection of the extended lines of the two winding grooves 11113. One winding 1114 is wound in a plurality of winding slots 11113 of one iron core 1111, and another winding 1114 is wound in a plurality of winding slots 11113 of another iron core 1111. The winding 1114 is a distributed winding, and the winding 1114 includes a winding 11141 wound in the winding slots 11113, and the winding 11141 is a flat wire. The plurality of teeth 11111 of the two iron cores 1111 are connected into one body through an injection molded part 1112. When the air gap sides of the two iron cores 1111 are arranged opposite to each other, the teeth 11111 of the two iron cores 1111 are arranged in close contact along the axial direction of the stator assembly 111.

[0134] Second, please also refer to Figures 4 to 6 An embodiment of the present application provides an axial flux motor 11, comprising a stator assembly 111 of any one of the above embodiments.

[0135] Since the axial flux motor 11 provided in the embodiment of the present application adopts the stator assembly 111 of any of the above-mentioned embodiments, the assembly process of the axial flux motor 11 is effectively simplified.

[0136] In some embodiments of this application, please refer to Figure 6The axial flux motor 11 further includes a rotor 112 . When the air gap sides of the two iron cores 1111 are arranged opposite to each other, the rotor 112 is arranged between the two iron cores 1111 and coaxially with the two iron cores 1111 .

[0137] In other words, in this embodiment, the axial flux motor 11 is a single-rotor axial flux motor.

[0138] By adopting the above technical solution, the assembly process of the single-rotor axial flux motor is effectively simplified.

[0139] In some embodiments of this application, please refer to Figure 4 and Figure 5 The axial flux motor 11 also includes two rotors 112. When the air gap sides of the two iron cores 1111 are arranged opposite to each other, one rotor 112 is arranged opposite to the air gap side of one iron core 1111, and the other rotor 112 is arranged opposite to the air gap side of the other iron core 1111.

[0140] In other words, in this embodiment, the axial flux motor 11 is a dual-rotor axial flux motor.

[0141] By adopting the above technical solution, the assembly process of the dual-rotor axial flux motor is effectively simplified.

[0142] Third, see Figure 3 An embodiment of the present application provides an electric drive device 10, comprising an axial flux motor 11 of any one of the above embodiments.

[0143] Since the electric drive device 10 provided in the embodiment of the present application adopts the axial flux motor 11 of any one of the above-mentioned embodiments, the assembly process of the electric drive device 10 is effectively simplified.

[0144] Fourth, please refer to Figure 1 , an embodiment of the present application provides an electric drive system 100 , including a battery 20 and the above-mentioned electric drive device 10 , and the battery 20 is electrically connected to the electric drive device 10 .

[0145] Since the electric drive system 100 provided in the embodiment of the present application adopts the electric drive device 10 of any of the above-mentioned embodiments, the assembly process of the electric drive system 100 is effectively simplified.

[0146] Fifth, please refer to Figure 1 , an embodiment of the present application provides an electric device, including the above-mentioned electric drive system 100.

[0147] Since the electric device provided in the embodiment of the present application adopts the electric drive system 100 of any of the above embodiments, the assembly process of the electric device is effectively simplified.

[0148] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A stator assembly, applied to an axial flux motor, characterized in that: The stator assembly includes two iron cores, the air gap sides of the two iron cores are arranged opposite to each other or back to back, the air gap sides of the iron cores are provided with a plurality of winding slots arranged around the central axis of the stator assembly, the projection of the iron core along the axial direction of the stator assembly is a first projection, and in the first projection, the length direction of the winding slots is relatively inclined to the radial direction of the iron core.

2. The stator assembly according to claim 1, characterized in that: The projection of the stator assembly along the axial direction of the stator assembly is a second projection. In the second projection, the plurality of winding slots of one iron core and the plurality of winding slots of another iron core are intersected and arranged in a one-to-one correspondence.

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

4. The stator assembly according to claim 1, characterized in that: In the first projection, the angles θ are the same, and the angles θ of the two cores are the same.

5. The stator assembly according to any one of claims 1 to 4, characterized in that: The stator assembly further includes an injection molded part, the iron core includes a plurality of teeth, the plurality of teeth are spaced apart along the circumference of the stator assembly to form a plurality of winding slots, and the plurality of teeth are connected through the injection molded part.

6. The stator assembly according to claim 5, characterized in that: The multiple teeth of the two cores are connected into one piece through the injection molded part.

7. The stator assembly according to claim 6, characterized in that: When the air gap sides of the two cores are arranged opposite to each other, the teeth of the two cores are arranged in close contact with each other along the axial direction of the stator assembly.

8. The stator assembly according to any one of claims 1 to 4, characterized in that: The iron core includes a yoke and a plurality of teeth arranged on the yoke, wherein the plurality of teeth are arranged at intervals along the circumference of the stator assembly to form a plurality of winding slots, and when the air gap sides of the two iron cores are arranged back to back, the yokes of the two iron cores are an integral component.

9. The stator assembly according to any one of claims 1 to 4, characterized in that: The stator assembly further includes two groups of windings, wherein the windings include windings wound in the winding slots, and the windings are flat wires.

10. The stator assembly according to any one of claims 1 to 4, characterized in that: The stator assembly also includes two groups of windings, which are wound in the winding slots and are distributed windings.

11. The stator assembly according to any one of claims 1 to 4, characterized in that: A plurality of wire inlets are provided on the air gap side of the iron core, and the plurality of wire inlets are connected to the plurality of winding grooves in a one-to-one correspondence, and the width of the wire inlets is smaller than the width of the winding grooves.

12. The stator assembly according to any one of claims 1 to 4, characterized in that: The stator assembly further includes a stator shell for accommodating a cooling medium, and the iron core is accommodated in the stator shell.

13. An axial flux motor, characterized in that: The axial flux electric machine comprises a stator assembly as claimed in any one of claims 1-12.

14. The axial flux motor according to claim 13, characterized in that: The axial flux motor further comprises a rotor, which is disposed between the two cores and coaxially with the two cores when the air gap sides of the two cores are disposed opposite to each other.

15. The axial flux motor according to claim 13, characterized in that: The axial flux motor further comprises two rotors. When the air gap sides of the two cores are arranged opposite to each other, one rotor is arranged opposite to the air gap side of one core, and the other rotor is arranged opposite to the air gap side of the other core.

16. An electric drive device, characterized in that: The electric drive device comprises an axial flux motor as claimed in any one of claims 13-15.

17. An electric drive system, characterized in that: The electric drive system comprises a battery and the electric drive device as claimed in claim 16, wherein the battery is electrically connected to the electric drive device.

18. An electric device, characterized in that: The electric device comprises the electric drive system according to claim 17.

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