Stator assembly, axial flux motor and vehicle
By setting notches and slots on the end sides of the stator teeth and rotor assembly and optimizing the stator pressure plate design, the torque pulsation problem of the axial flux motor was solved, improving the motor's running smoothness and overall performance.
Patent Information
- Application Number
- CN202423106456.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing axial flux motors have significant torque ripple, which leads to increased electromagnetic noise and unstable operation, affecting overall performance.
Notches and slots are provided on the opposite ends of the stator teeth and rotor assembly. The magnetic field distribution is optimized and harmonic components are reduced through the design of the stator pressure plate. At the same time, the mechanical fit between the stator and the stator pressure plate is optimized, reducing space occupation and air gap influence.
It reduces torque ripple, improves the smoothness of motor operation, reduces vibration and noise, improves motor efficiency and mechanical stability, and optimizes space utilization and mechanical coordination.
Smart Images
Figure CN223680822U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of electric machines, and in particular to a stator assembly, an axial flux electric machine and a vehicle. BACKGROUND
[0002] Axial flux electric machines are widely used in various fields, including vehicles, aerospace, ship propulsion, wind power generation, robots, agricultural machinery, construction equipment, and elevators, due to their compact structure, high torque density, high power density, and high efficiency.
[0003] However, the main challenge currently faced by such electric machines is the large torque ripple, which leads to increased electromagnetic noise and other problems, reducing the smoothness of the electric machine operation and thus affecting the overall performance. CONTENT OF THE UTILITY MODEL
[0004] The embodiments of the present application provide a stator assembly, an axial flux electric machine and a vehicle, which reduce torque ripple, optimize space occupation and mechanical cooperation, and improve the overall performance of the electric machine, at least partially solving the above technical problems.
[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, a stator assembly is provided, comprising:
[0006] a stator comprising a plurality of stator teeth arranged along the circumference of the stator, each of the stator teeth having two oppositely arranged end sides along the axial direction of the stator, at least one of the end sides being arranged opposite to a rotor assembly and provided with a notch slot; and
[0007] a stator pressing plate having a first part and a second part connected to each other, the first part being arranged in the notch slot, and the second part being arranged opposite to the stator teeth in the radial direction of the stator and / or the circumferential direction of the stator.
[0008] Optionally, along the circumferential direction of the stator, two adjacent stator teeth are arranged with a gap to form a stator slot for accommodating a winding, and the notch slot is in communication with the stator slot.
[0009] Optionally, along the circumferential direction of the stator, at least one of the stator teeth has two opposite sides arranged opposite to each other, and at least one of the opposite sides is provided with the notch slot.
[0010] Optionally, along the radial direction of the stator, the stator teeth further comprise an inner side and an outer side arranged opposite to each other.
[0011] The inner side and / or the outer side is / are provided with the notch slot, and the notch slot arranged on the inner side and / or the outer side is / are in communication with the notch slot arranged on the opposite side.
[0012] Optionally, the stator tooth has two ends oppositely arranged in the radial direction of the stator, at least one of the ends has two corners oppositely arranged in the circumferential direction of the stator, at least one of the corners is provided with the notch slot.
[0013] Optionally, the stator tooth has a first end face for being oppositely arranged with the rotor assembly, the stator plate has a second end face for being oppositely arranged with the rotor assembly, the first end face is flush with the second end face, or the second end face is arranged closer to the rotor assembly than the first end face.
[0014] Optionally, the slot bottoms of the plurality of notch slots are flush in the axial direction of the stator.
[0015] Optionally, the stator further comprises a stator yoke connected between two adjacent stator teeth.
[0016] Optionally, in the axial direction of the stator, the end faces of at least two stator teeth for being oppositely arranged with the rotor assembly have a height difference.
[0017] Optionally, the height difference is less than or equal to 3mm.
[0018] According to a second aspect of the present application, there is provided an axial flux motor comprising:
[0019] a stator assembly as in any one of the preceding items; and,
[0020] a rotor assembly arranged in the axial direction of the stator with the stator assembly.
[0021] According to a third aspect of the present application, there is provided a vehicle comprising an axial flux motor as described above.
[0022] The stator assembly of the embodiment of the present application effectively adjusts the magnetic field distribution by setting the notch groove on the end side opposite to the rotor assembly of the stator tooth, reduces the harmonic component, thereby reducing the torque ripple, improving the smoothness of the motor operation, and reducing the vibration and noise caused by the torque fluctuation; the first part of the stator pressing plate is arranged in the notch groove, and the second part is arranged opposite to the stator tooth in the radial direction or the circumferential direction of the stator, thereby realizing the at least partial nesting of the stator and the stator pressing plate. This design not only reduces the occupation of the axial space, minimizes the influence on the air gap space between the stator and the rotor, avoids unnecessary expansion of the spacing, is conducive to maintaining the designed air gap parameters, and improves the motor efficiency; also optimizes the mechanical cooperation and stability of the stator and the stator pressing plate, and enhances the overall performance. That is, the stator assembly of the embodiment of the present application sets the notch groove on the end side opposite to the rotor assembly of the stator tooth, and the first part of the stator pressing plate is arranged in the notch groove, and the second part of the stator pressing plate is arranged opposite to the stator tooth in the radial direction or the circumferential direction of the stator, thereby reducing the torque ripple, optimizing the space occupation and mechanical cooperation, and improving the overall performance of the motor.
[0023] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any creative labor on the basis of these drawings.
[0025] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.
[0026] Figure 1 is an explosion schematic diagram of the axial flux motor of the present disclosure;
[0027] Figure 2 is a perspective schematic diagram of the stator assembly of the present disclosure;
[0028] Figure 3 is a first structure perspective schematic diagram of the stator of the present disclosure;
[0029] Figure 4 is Figure 3 the front view schematic diagram of the stator in
[0030] Figure 5 is a structure top view schematic diagram of the stator pressing plate matched with the stator in Figure 3
[0031] Figure 6 is a second structure schematic view of the stator of the present disclosure;
[0032] Figure 7 is Figure 6 is a structure schematic view of a set of stator teeth of the stator in
[0033] Figure 8 is a second structure schematic view of a set of stator teeth of the present disclosure;
[0034] Figure 9 is a third structure schematic view of a set of stator teeth of the present disclosure;
[0035] Figure 10 is a structure schematic view of a set of stator teeth of the present Figure 9
[0036] Legend of reference signs:
[0037] 1000, axial flux motor; 100, stator assembly; 110, stator; 101, stator tooth; 102, end side; 103, notch slot; 1031, slot bottom; 104, opposite side; 105, inner side; 106, outer side; 107, corner; 108, first end face; 109, stator yoke; 120, stator pressing plate; 121, first part; 122, second part; 123, second end face; 124, through hole; 130, winding; 140, stator slot; 200, rotor assembly; 210, rotor disc; 220, permanent magnet. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0039] The present application provides a stator assembly, please refer to Figure 1 , Figure 1 is a structure schematic view of the axial flux motor provided by the embodiments of the present application, Figures 2 to 10 is a structure schematic view of the stator assembly provided by the embodiments of the present application.
[0040] See Figure 1 , Figure 2 and Figure 3 The stator assembly 100 comprises a stator 110 and a stator pressing plate 120. The stator 110 comprises a plurality of stator teeth 101 arranged along the circumferential direction of the stator 110, and each stator tooth 101 has two end sides 102 arranged oppositely along the axial direction of the stator 110, at least one of which is arranged oppositely to the rotor assembly 200 and provided with a notch groove 103. The stator 110 is a fixed part in the motor, and a magnetic field is generated by energizing the winding 130 to interact with the rotor to achieve energy conversion. It can be understood that the axial direction of the stator 110 coincides with the axial direction of the rotor and the rotation axis of the motor.
[0041] See Figure 5 The stator pressing plate 120 has a first part 121 and a second part 122 connected to each other (distinguished by a dashed line in the figure, the part near the through hole 124 is the first part 121, and the remaining part is the second part 122), the first part 121 is arranged in the notch groove 103 (see Figure 5 and Figure 3 ), and the second part 122 is arranged oppositely to the stator tooth 101 in the radial direction of the stator 110 and / or the circumferential direction of the stator 110 (specifically, Figure 5 The second part 122 comprises a small annular part and a large annular part arranged oppositely to the stator tooth 101 in the radial direction of the stator tooth 101, and a plurality of rectangular parts arranged oppositely to the stator tooth 101 in the circumferential direction of the stator tooth 101). One of the main functions of the stator pressing plate 120 is to prevent the winding 130 from moving in the axial direction (see Figure 2 ), thereby improving the installation stability of the winding 130. The stator pressing plate 120 can also seal the winding 130 to prevent internal coolant leakage. By closely fitting with the stator 110, the stator pressing plate 120 also enhances the mechanical strength of the entire stator assembly 100.
[0042] In the technical solution of the present application, by arranging the notch groove 103 on the end side 102 of the stator tooth 101 opposite to the rotor assembly 200, the magnetic field distribution is effectively adjusted, the harmonic component is reduced, the torque ripple is reduced, the stability of the motor operation is improved, and the vibration and noise caused by torque fluctuation are reduced; the first part 121 of the stator pressing plate 120 is arranged in the notch groove 103, and the second part 122 is arranged oppositely to the stator tooth 101 in the radial direction or the circumferential direction of the stator 110, thereby achieving at least partial nesting of the stator 110 and the stator pressing plate 120. This design not only reduces the occupation of the axial space, minimizes the impact on the air gap space between the stator 110 and the rotor, avoids unnecessary expansion of the spacing, is conducive to maintaining the designed air gap parameters, and improves the efficiency of the motor; and optimizes the mechanical cooperation and stability of the stator 110 and the stator pressing plate 120, and enhances the overall performance.
[0043] That is, in the technical solution of the present application, the notch groove 103 is arranged on the end side 102 opposite to the rotor assembly 200 of the stator tooth 101, and the first part 121 of the stator pressing plate 120 is arranged in the notch groove 103, and the second part 122 of the stator pressing plate 120 is arranged opposite to the stator tooth 101 in the radial or circumferential direction of the stator 110. While reducing torque ripple, the space occupation and mechanical cooperation are optimized, and the overall performance of the motor is improved.
[0044] It can be understood that the stator tooth 101 has a circumferential side connected between the two end sides 102, and the second part 122 of the stator pressing plate 120 is arranged opposite to the stator tooth 101 in the radial or circumferential direction of the stator 110, which means that the second part 122 is arranged on the circumferential side of the stator tooth 101. Since the second part 122 can be connected with the first part 121 embedded in the notch groove 103, it indicates that the notch groove 103 penetrates through the circumferential side of the stator tooth 101. Specifically, referring to Figure 6 , taking the circumferential side of the stator tooth 101 as an example, which includes two opposite sides 104 (opposite to the adjacent stator tooth 101) arranged opposite in the circumferential direction of the stator 110, and an inner side 105 (corresponding to the motor shaft) and an outer side 106 (corresponding to the motor shell) arranged opposite in the radial direction of the stator 110, the notch groove 103 penetrates through the inner side 105 and the outer side 106 of the stator tooth 101, but does not communicate with the two opposite sides 104, that is, does not communicate with the stator slot 140. In this design, the stator tooth 101 includes two convex parts located on both sides of the notch groove 103, so the corresponding stator pressing plate 120 needs to be provided with two hollow areas to adapt to this structure, so that the shape of the stator pressing plate 120 is slightly complex.
[0045] The present application does not limit whether the notch groove 103 communicates with the stator slot 140. In some embodiments, referring to Figure 3 and Figure 6 , along the circumferential direction of the stator 110, two adjacent stator teeth 101 are arranged at intervals to form a stator slot 140 for accommodating the winding 130, and the notch groove 103 communicates with the stator slot 140. In these embodiments, the notch groove 103 communicates with the stator slot 140, which simplifies the structure of the stator pressing plate 120, facilitates manufacturing and assembly, and improves production efficiency and reliability. Specifically, referring to Figure 1 , Figure 2 and Figure 5 , the stator pressing plate 120 is arranged in a ring shape, and the stator pressing plate 120 is provided with a through hole 124 corresponding to the stator tooth 101 to realize nesting with the stator 110.
[0046] In some embodiments, referring to Figure 3 , Figure 6 and Figure 7In some embodiments, as shown in FIG. 1 1, along the circumferential direction of the stator 1 10, at least one stator tooth 101 has two opposite sides 104 (opposite to the adjacent stator tooth 101 ) provided with the notched slot 103. In these embodiments, at least one opposite side 104 provided with the notched slot 103 can provide good support to the stator pressing plate 120 along the radial direction of the stator 1 10, optimize the mechanical fit, and improve the mechanical stability. In some examples, one opposite side 104 is provided with the notched slot 103, which can simplify the shape of the stator tooth 101 and reduce the manufacturing difficulty while achieving the function. In some examples, as shown in Figure 3 , Figure 6 and Figure 7 , both opposite sides 104 are provided with the notched slot 103, which can be symmetrically or asymmetrically arranged. The provision of two notched slots 103 can provide more balanced support to the stator pressing plate 120, further optimize the mechanical fit, and improve the mechanical stability.
[0047] In some embodiments, as shown in Figure 8 , along the radial direction of the stator 1 10, the stator tooth 101 further comprises an inner side 105 and an outer side 106 provided opposite to each other; the inner side 105 and / or the outer side 106 is provided with the notched slot 103, and the notched slot 103 provided on the inner side 105 and / or the outer side 106 is in communication with the notched slot 103 provided on the opposite side 104. In these embodiments, the notched slot 103 provided on the inner side 105 and / or the outer side 106 provides additional support points for the stator pressing plate 120, and enhances the overall mechanical stability. In some examples, as shown in Figure 8 , both opposite sides 104 are provided with the notched slot 103, and the inner side 105 and the outer side 106 are provided with the notched slot 103, i.e., the notched slot 103 is provided around the circumferential side of the stator tooth 101, which can provide all-around support to the stator pressing plate 120, further optimize the mechanical fit, and improve the mechanical stability.
[0048] In some embodiments, as shown in Figure 9 and Figure 10, the stator tooth 101 has two end portions oppositely arranged in the radial direction of the stator 110, at least one end portion has two corner portions 107 oppositely arranged in the circumferential direction of the stator 110, and at least one corner portion 107 is provided with a notch groove 103. In these embodiments, by arranging the notch groove 103 at the corner portion 107 of the stator tooth 101, the torque ripple can be effectively reduced, while the core material of the stator tooth 101 is cut less, thus the impact on the magnetic circuit is minimized, and the torque loss is relatively less. This design can maximize the integrity of the magnetic flux path while reducing the torque ripple, reduce the torque loss, and improve the overall performance of the motor. In some examples, the end portion of the stator tooth 101 away from the central axis thereof has two corner portions 107, one of which is provided with a notch groove 103, which can realize the function while the shape of the stator tooth 101 is relatively simple, reducing the manufacturing difficulty. In some examples, as shown in Figure 9 and Figure 10 , the end portion of the stator tooth 101 away from the central axis thereof has two corner portions 107, both of which are provided with a notch groove 103. The two notch grooves 103 can be symmetrically arranged or asymmetrically arranged. The arrangement of two notch grooves 103 can ensure the close fit between the stator pressing plate 120 and the stator tooth 101, and improve the mechanical stability.
[0049] In some embodiments, as shown in Figure 2 , the stator tooth 101 has a first end face 108 for being oppositely arranged with the rotor assembly 200, and the stator pressing plate 120 has a second end face 123 for being oppositely arranged with the rotor assembly 200. The first end face 108 is flush with the second end face 123, or the second end face 123 is arranged closer to the rotor assembly 200 than the first end face 108. In these embodiments, when the second end face 123 is arranged closer to the rotor assembly 200 than the first end face 108, the stator tooth 101 is inwardly recessed, and the stator pressing plate 120 can better protect the stator tooth 101. When the first end face 108 is flush with the second end face 123, the stator pressing plate 120 can protect the circumferential side of the stator tooth 101, and ensure that the stator pressing plate 120 does not occupy the air gap space, thereby optimizing the space utilization.
[0050] In some embodiments, as shown in Figure 4 , the bottoms 1031 of the plurality of notch grooves 103 are flush in the axial direction of the stator 110. In these embodiments, the flush arrangement of the plurality of bottoms 1031 ensures that the stator pressing plate 120 can be smoothly embedded in the notch groove 103, enhances the mechanical stability, prevents stress concentration and deformation caused by unevenness, simplifies the assembly process, ensures the close fit between the stator pressing plate 120 and the stator tooth 101, and improves the assembly efficiency and reliability.
[0051] The application does not make specific limitation on whether the stator 110 is a yokeless stator 110 or a yoked stator 110. When the stator 110 is a yokeless stator 110 (see Figure 6 ), the material usage of the stator 110 is less, and the separately arranged stator teeth 101 make the winding of the winding 130 more convenient, improve the winding speed of the winding 130, and improve the manufacturing efficiency. After the winding of the plurality of stator teeth 101 is completed, the stator assembly 100 is integrated and fixed by the stator pressing plate 120. Specifically, the plurality of stator teeth 101 are bonded with the stator pressing plate 120.
[0052] In some embodiments, see Figure 3 and Figure 4 , the stator 110 further comprises a stator yoke 109 connected between two adjacent stator teeth 101. In these embodiments, the stator yoke 109 connects the plurality of stator teeth 101 into a whole, enhances the mechanical strength and stability of the stator assembly 100, prevents the displacement or loosening of the stator teeth 101 during the operation of the motor, optimizes the magnetic flux path by the presence of the stator yoke 109, reduces the magnetic resistance, improves the utilization rate of the magnetic flux, and thus improves the overall performance of the motor.
[0053] In some embodiments, see Figure 4 , at least two stator teeth 101 have a height difference with the end surface (i.e., the first end surface 108) opposite to the rotor assembly 200 in the axial direction of the stator 110. In these embodiments, it can be understood that the end surface opposite to the rotor assembly 200 forms an air gap with the rotor assembly 200, and the height difference of the end surface opposite to the rotor assembly 200 will form an uneven air gap between the at least two stator teeth 101 and the rotor assembly 200, reduce the magnetic field harmonics, and help to reduce the cogging torque and torque ripple.
[0054] In some embodiments, the height difference is less than or equal to 3 mm. In these embodiments, controlling the height difference within 3 mm can effectively avoid that the air gap between certain stator teeth 101 and the rotor assembly 200 is too large, so as to keep the air gap parameter within a reasonable range, ensure the stability of the torque size, and the moderate height difference helps to optimize the magnetic field distribution, reduce the harmonic components, reduce the torque ripple, while not affecting the overall performance and reliability of the motor.
[0055] According to a second aspect of the application, see Figure 1The axial flux motor 1000 comprises a stator assembly 100 and a rotor assembly 200, the rotor assembly 200 is arranged in the axial direction of the stator 110, the structure of the stator assembly 100 is as described above, and since the axial flux motor 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Specifically, the rotor assembly 200 comprises a rotor disc 210 and a permanent magnet 220, the rotor disc 210 is provided with a mounting groove, and the permanent magnet 220 is arranged in the mounting groove.
[0056] The disclosure exemplarily describes the structure of a double-rotor single-stator axial flux motor 1000, taking three stator teeth 101 in each group as an example, the two end sides 102 of the three stator teeth 101 form uneven air gaps with the two rotor assemblies 200, thereby reducing the cogging torque and torque ripple. Specifically, the groove bottoms 1031 of the three notch grooves 103 are flush, and the groove depths of the three notch grooves 103 are different, that is, see Figure 7 、 Figure 8 and Figure 9 The main body segment sizes h of the three stator teeth 101 in each group of stator teeth 101 for winding the windings 130 are equal, the groove depths of the three notch grooves 103 are a, b and c respectively, wherein a < b < c, that is, the overall sizes of the three stator teeth 101 in the axial direction are 2a + h, 2b + h and 2c + h respectively, the thickness of the stator pressing plate 120 is equivalent to the deepest groove depth c, and after the stator pressing plate 120 is assembled with the stator 110, the two stator teeth 101 with the overall sizes of 2a + h and 2b + h in the axial direction are retracted in the stator pressing plate 120, and the stator tooth 101 with the overall size of 2c + h in the axial direction is just flush with the stator pressing plate 120.
[0057] According to a third aspect of the present application, a vehicle is provided, comprising an axial flux motor 1000, the structure of the axial flux motor 1000 is as described above, and since the vehicle adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.
[0058] The vehicle can be a fuel automobile, a plug-in hybrid electric vehicle or a new energy vehicle, and the disclosure does not make specific limitations thereon.
[0059] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0060] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.
[0061] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.
[0062] The above are only the preferred embodiments of the present application, and do not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application and in accordance with the technical essence of the present application still belongs to the scope of the technical solution of the present application.
Claims
1. A stator assembly characterized by, The stator comprises a plurality of stator teeth arranged along a circumferential direction of the stator, each of the stator teeth having two end sides arranged oppositely along an axial direction of the stator, at least one of the end sides being arranged oppositely to the rotor assembly and provided with a notch slot; and The stator plate has a first portion and a second portion connected to each other, the first portion being arranged in the notch slot along a radial direction of the stator and / or a circumferential direction of the stator, and the second portion being arranged oppositely to the stator teeth. Along the circumferential direction of the stator, two adjacent stator teeth are arranged at intervals to form a stator slot for accommodating a winding, and the notch slot is in communication with the stator slot.
2. The stator assembly of claim 1, wherein, Along the circumferential direction of the stator, at least one of the stator teeth has two opposite sides arranged oppositely, and at least one of the opposite sides is provided with the notch slot.
3. The stator assembly of claim 2, wherein, Along the radial direction of the stator, the stator teeth further comprise an inner side and an outer side arranged oppositely; 4. The stator assembly of claim 3, wherein, The inner side and / or the outer side is provided with the notch slot, and the notch slot arranged on the inner side and / or the outer side is in communication with the notch slot arranged on the opposite side. The stator teeth have two end portions arranged oppositely along the radial direction of the stator, at least one of the end portions has two corner portions arranged oppositely along the circumferential direction of the stator, and at least one of the corner portions is provided with the notch slot.
5. The stator assembly of claim 2, wherein, The stator teeth have a first end surface arranged oppositely to the rotor assembly, the stator plate has a second end surface arranged oppositely to the rotor assembly, and the first end surface is flush with the second end surface, or the second end surface is arranged closer to the rotor assembly than the first end surface.
6. The stator assembly of claim 1, wherein, The slot bottoms of the plurality of notch slots are flush along the axial direction of the stator.
7. The stator assembly of claim 1, wherein, The stator further comprises a stator yoke connected between two adjacent stator teeth.
8. The stator assembly of claim 1, wherein, Along the axial direction of the stator, the end surfaces of at least two stator teeth arranged oppositely to the rotor assembly have a height difference.
9. A stator assembly according to any one of claims 1 to 8, wherein, The height difference is less than or equal to 3 mm.
10. The stator assembly of claim 9, wherein, The stator assembly comprises:
11. An axial flux electric machine characterised in that, The stator assembly according to any one of claims 1 to 10; and The rotor assembly is arranged along the axial direction of the stator with respect to the stator assembly. The axial flux motor comprises the stator assembly according to claim 11. 12. A vehicle characterized by comprising: