Stator core of axial flux motor

Abstract

The utility model relates to the technical field of motors, in particular to a stator core of an axial flux motor. The stator core of the axial flux motor comprises a plurality of groups of U-shaped monomer structures, each group of U-shaped monomer structures is formed by bending sheets stacked together along the thickness direction, each sheet comprises a second part, a first part and a third part which are sequentially connected along the rolling direction, and the second part and the third part are respectively folded towards the same side relative to the first part; each U-shaped monomer structure comprises a yoke part and half-tooth parts located at the two ends, in the rolling direction, of the yoke part, the multiple first parts jointly form the yoke part, and the multiple second parts and the multiple third parts form the half-tooth parts correspondingly; the plurality of groups of U-shaped monomer structures are circularly arranged around the axial direction in a radial plane in a state that the orientation of a U-shaped opening is the same as the axial direction; and the half tooth parts of two adjacent U-shaped monomer structures are attached to each other to form a stator single tooth.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to the stator core of an axial flux motor. Background Technology

[0002] An axial flux motor includes a stator assembly and a rotor assembly arranged axially. The direction of magnetic flux in an axial flux motor is axial. Figure 1 As shown, taking an axial flux motor with a dual-stator single-rotor structure as an example, its internal magnetic circuit is axially connected to the existing stator assembly 1 and the existing rotor assembly 2.

[0003] In existing technologies, such as Figures 2-5 As shown, the existing stator assembly 1 includes an existing stator core 11 and coil windings fixed to the existing stator core 11. The rotor assembly includes a cage and permanent magnets fixed to the cage. The existing stator core 11 includes existing teeth 101 and existing yoke 102. The existing stator core 11 is formed by winding silicon steel sheets 3 rolled along its length. A sawtooth structure 31 is processed on the silicon steel sheets 3 by punching and shearing. When the silicon steel sheets 3 are wound into the existing stator core 11, the sawtooth structure 31 can form the existing teeth 101 for securing the coil windings. The magnetic circuit within the existing stator core 11 is divided into a first part located in the existing teeth 101 and perpendicular to the rolling direction of the silicon steel sheets 3, and a second part located in the existing yoke 102 and parallel to the rolling direction of the silicon steel sheets 3. It is known that the silicon steel sheets 3 have the best magnetic properties and the lowest iron loss along their rolling direction, and the worst magnetic properties and the highest iron loss perpendicular to their rolling direction. The magnetic properties are worst when the magnetic circuit direction is perpendicular to the rolling direction, and the magnetic properties are best when the magnetic circuit direction is parallel to the rolling direction. Therefore, the magnetic circuit in the existing tooth section 101 greatly affects the performance of the axial flux motor.

[0004] Therefore, there is an urgent need to invent a stator core for an axial flux motor to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a stator core for an axial flux motor to reduce the magnetic loss of the stator core and improve the performance of the axial flux motor.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The stator core of an axial flux motor includes:

[0008] Multiple sets of U-shaped single-unit structures, each set of U-shaped single-unit structures is formed by bending sheets stacked together along the thickness direction, each sheet includes a second part, a first part and a third part connected in sequence along the rolling direction, the second part and the third part are respectively bent towards the same side relative to the first part;

[0009] Each group of the U-shaped single-unit structures includes a yoke and half-tooth portions located at both ends of the yoke along the rolling direction. Multiple first portions together form the yoke, and multiple second portions and multiple third portions respectively form the half-tooth portions.

[0010] Multiple sets of the U-shaped single-unit structures are arranged in a circular pattern around the axial direction in the radial plane with the U-shaped opening facing the same direction as the axial direction. The half-tooth portions of two adjacent U-shaped single-unit structures (100) fit together to form a stator single tooth.

[0011] As an alternative, the semi-tooth portion has an outer sidewall fixedly connected to the other semi-tooth portions and an inner sidewall disposed opposite to the outer sidewall. The outer sidewall extends radially from the outside to the inside along the circle formed by the plurality of U-shaped single-unit structures while tilting toward the direction close to the inner sidewall.

[0012] As an optional solution, the stator core of the axial flux motor further includes:

[0013] The slotted wedge has a snap-fit ​​groove on its half-tooth portion. The slotted wedge blocks the U-shaped opening and snaps into the snap-fit ​​groove for fixation. The slotted wedge is configured to limit and fix the coil along the axial direction.

[0014] As an optional solution, the second part is provided with two first notches at one end away from the first part along the rolling direction. The two first notches extend inward from two outer end faces perpendicular to the rolling direction along a direction perpendicular to the rolling direction. Multiple first notches stacked together along the thickness direction together form the snap-fit ​​groove.

[0015] The third part has a second notch at one end away from the first part along the rolling direction. The second notch extends inward from the outer end face perpendicular to the rolling direction along a direction perpendicular to the rolling direction. Multiple second notches together form the snap-fit ​​groove.

[0016] As an optional solution, the slot wedge includes:

[0017] A slotted wedge body, the slotted wedge body being used to limit and fix the coil along the axial direction; and

[0018] The first and second snap-fit ​​parts are respectively connected to the two ends of the groove wedge body that are opposite to each other. The half-tooth part is provided with snap-fit ​​grooves at both ends of the radial direction of the circle formed by the multiple U-shaped single structures. The first and second snap-fit ​​parts are snap-fitted and fixed to the snap-fit ​​grooves respectively.

[0019] As an optional solution, the first snap-fit ​​part is provided with a first insertion groove, and the second snap-fit ​​part is provided with a second insertion groove, and the groove wedge body is respectively inserted and fixed with the first insertion groove and the second insertion groove.

[0020] As an optional feature, the slot wedge has a magnetic conductivity function.

[0021] As an optional solution, there is an outward bending surface between the half-tooth portion and the yoke portion, and when two adjacent half-tooth portions constitute the stator single tooth, a clearance space is formed between the two outward bending surfaces.

[0022] As an optional solution, two adjacent U-shaped single structures may be welded or bonded together.

[0023] As an alternative, the sheets stacked together along the thickness direction can be welded or bonded together.

[0024] The beneficial effects of this utility model are:

[0025] The stator core of the axial flux motor provided by this utility model, through the arrangement of multiple sets of U-shaped single-unit structures, each set of U-shaped single-unit structures including a half-tooth portion and a yoke portion, and the multiple sets of U-shaped single-unit structures arranged in a circular manner around the axial direction in the radial plane with the U-shaped openings facing the same direction as the axial direction, ensures that adjacent two U-shaped single-unit structures are fixedly connected by half-tooth portions, and that the half-tooth portions fixedly connected between each pair of adjacent U-shaped single-unit structures can form a stator single tooth. This achieves the effect of multiple stator single teeth formed by multiple sets of U-shaped single-unit structures circularly clamping and fixing the coils in the coil winding, thereby satisfying the requirements of the coil winding. To address the fixed requirements of the winding, the U-shaped single-unit structure is formed by bending multiple sheets stacked together along the thickness direction. Each sheet includes a second part, a first part, and a third part connected sequentially along the rolling direction. The second and third parts are bent to the same side relative to the first part. The stacked first parts of the multiple sheets form a yoke, and the stacked second and third parts form semi-tooth parts. The magnetic circuits within the semi-tooth parts and yoke parts are aligned with the rolling direction of the sheets, thereby reducing the magnetic loss of the stator core of the axial flux motor and improving its performance. Furthermore, during manufacturing, there is no need for punching or shearing the sheets; the semi-tooth parts and yoke parts are constructed simply by bending the sheets, greatly improving the utilization rate of the sheets. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the magnetic circuit inside an axial flux motor with a dual-stator single-rotor structure in the prior art;

[0027] Figure 2 This is one of the processing steps for the stator core of an axial flux motor in the existing technology;

[0028] Figure 3 This is the second step diagram of the machining process of the stator core of an axial flux motor in the existing technology;

[0029] Figure 4 This is the third step in the processing of the stator core of an axial flux motor in the existing technology;

[0030] Figure 5 This is a schematic diagram of the magnetic circuit inside the stator core of an axial flux motor in the prior art;

[0031] Figure 6 This is a schematic diagram of the structure of the stator core and coil winding of the axial flux motor provided in this embodiment of the utility model;

[0032] Figure 7 This is a schematic diagram of the first structure of the stator core of the axial flux motor provided in this embodiment of the utility model;

[0033] Figure 8 This is a schematic diagram of the U-shaped single-unit structure provided in this embodiment of the utility model;

[0034] Figure 9 This is a schematic diagram of the sheet material in a bent state provided in this embodiment of the utility model;

[0035] Figure 10 yes Figure 6 A magnified view of a section at point A in the middle;

[0036] Figure 11 yes Figure 7 A magnified view of a section at point B in the middle;

[0037] Figure 12 This is a schematic diagram of the sheet material provided in the embodiment of the present invention in its unbent state;

[0038] Figure 13 This is a schematic diagram of the groove wedge structure provided in an embodiment of the present invention;

[0039] Figure 14 This is a cross-sectional schematic diagram of the groove wedge provided in this embodiment of the utility model;

[0040] Figure 15 This is a schematic diagram of two U-shaped single-unit structures fixed together according to an embodiment of the present invention;

[0041] Figure 16 This is a schematic diagram of the second structure of the stator core of the axial flux motor provided in this embodiment of the utility model;

[0042] Figure 17 yes Figure 16 A magnified view of a section at point C.

[0043] In the picture:

[0044] 1. Existing stator assembly; 11. Existing stator core; 101. Existing tooth section; 102. Existing yoke section; 2. Existing rotor assembly; 3. Silicon steel sheet; 31. Serrated structure;

[0045] 100. U-shaped single-unit structure; 110. Yoke; 120. Semi-toothed part; 121. Snap-fit ​​groove; 122. Outer side wall; 123. Inner side wall; 130. Outer bending surface;

[0046] 200. Sheet; 210. Part 1; 220. Part 2; 221. First notch; 230. Part 3; 231. Second notch;

[0047] 300, slotted wedge; 310, slotted wedge body; 320, first snap-fit ​​part; 321, first insertion slot; 330, second snap-fit ​​part; 331, second insertion slot;

[0048] 2000, coil winding. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0050] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0053] like Figure 1 As shown, taking an axial flux motor with a dual-stator, single-rotor structure as an example, its internal magnetic circuit connects the existing stator assembly 1 and the existing rotor assembly 2 axially. In the prior art, as... Figures 2-5 As shown, the existing stator assembly 1 includes an existing stator core 11 and coil windings fixed to the existing stator core 11. The rotor assembly includes a cage and permanent magnets fixed to the cage. The existing stator core 11 includes existing teeth 101 and existing yoke 102. The existing stator core 11 is formed by winding silicon steel sheets 3 rolled along its length. A sawtooth structure 31 is processed on the silicon steel sheets 3 by punching and shearing. When the silicon steel sheets 3 are wound into the existing stator core 11, the sawtooth structure 31 can form the existing teeth 101 for securing the coil windings. The magnetic circuit within the existing stator core 11 is divided into a first part located in the existing teeth 101 and perpendicular to the rolling direction of the silicon steel sheets 3, and a second part located in the existing yoke 102 and parallel to the rolling direction of the silicon steel sheets 3. It is known that the silicon steel sheets 3 have the best magnetic properties and the lowest iron loss along their rolling direction, and the worst magnetic properties and the highest iron loss perpendicular to their rolling direction. The magnetic properties are worst when the magnetic circuit direction is perpendicular to the rolling direction, and the magnetic properties are best when the magnetic circuit direction is parallel to the rolling direction. Therefore, the magnetic circuit in the existing tooth section 101 greatly affects the performance of the axial flux motor.

[0054] To solve the above problems, such as Figures 6-9 As shown, this embodiment provides a stator core for an axial flux motor. The stator core of the axial flux motor includes multiple sets of U-shaped single-unit structures 100. Each set of U-shaped single-unit structures 100 is formed by bending sheets 200 stacked together along the thickness direction. Each sheet 200 includes a second part 220, a first part 210, and a third part 230 connected sequentially along the rolling direction. The second part 220 and the third part 230 are bent towards the same side relative to the first part 210. Each set of U-shaped single-unit structures 100 includes a yoke 110 and half-tooth parts 120 located at both ends of the yoke 110 along the rolling direction. Multiple first parts 210 together form the yoke 110, and multiple second parts 220 and multiple third parts 230 respectively form half-tooth parts 120. The multiple sets of U-shaped single-unit structures 100 are arranged in a circular pattern around the axial direction in the radial plane with the U-shaped opening facing the same direction as the axial direction. The half-tooth parts 120 of two adjacent U-shaped single-unit structures 100 fit together to form a stator single tooth.

[0055] The stator core of this axial flux motor is configured with multiple sets of U-shaped single-unit structures 100, each including a half-tooth portion 120 and a yoke portion 110. These U-shaped single-unit structures 100 are arranged in a circular pattern around the axial direction in a radial plane, with the U-shaped openings aligned with the axial direction. This ensures that adjacent U-shaped single-unit structures 100 are fixedly connected by the half-tooth portions 120, and each pair of adjacent U-shaped single-unit structures 100 forming a single stator tooth. This achieves the effect of multiple stator teeth formed by the multiple sets of U-shaped single-unit structures 100 circularly clamping and fixing the coil within the coil winding 2000, thus meeting the fixing requirements of the coil winding 2000. Each unit structure 100 is formed by bending multiple sheets 200 stacked together along the thickness direction. Each sheet 200 includes a second part 220, a first part 210, and a third part 230 connected sequentially along the rolling direction. The second part 220 and the third part 230 are bent to the same side relative to the first part 210. The first part 210 stacked together from the multiple sheets 200 forms a yoke 110. The multiple second parts 220 and third parts 230 stacked together from the multiple sheets 200 form a semi-tooth part 120. The magnetic circuits in the semi-tooth part 120 and the yoke 110 are in the same direction as the rolling direction of the sheet 200, thereby reducing the magnetic loss of the stator core of the axial flux motor and improving the performance of the axial flux motor. Furthermore, during the manufacturing process, there is no need to punch or shear the sheet 200; the semi-toothed part 120 and the yoke part 110 can be constructed simply by bending the sheet 200, which greatly improves the utilization rate of the sheet 200.

[0056] It should be noted that, in this embodiment, the stator core of the axial flux motor includes 27 U-shaped individual structures 100. In other embodiments, the specific number of U-shaped individual structures 100 can be adjusted according to actual needs; this embodiment does not impose a specific limitation.

[0057] Furthermore, the thicknesses of the yoke 110 and the semi-tooth portion 120 should be adjusted according to actual needs. Specifically, the thicknesses of the yoke 110 and the semi-tooth portion 120 must meet the parameter requirements of the stator core of the axial flux motor in the prior art. For example, taking the thickness of the existing tooth 101 in the existing stator core 11 as D0, the thickness of the existing yoke 102 as L0, and the thickness of the semi-tooth portion 120 in the U-shaped single-unit structure 100 provided in this embodiment as D1, and the thickness of the yoke 110 as L1, as a limitation, it is necessary to ensure that 2*D1≥D0 and L1=L0 to meet the design requirements while ensuring the normal operation of the axial flux motor.

[0058] Alternatively, adjacent U-shaped single-unit structures 100 can be fixed by welding or bonding. Specifically, in this embodiment, the U-shaped single-unit structures 100 are fixedly connected by welding. In other embodiments, the U-shaped single-unit structures 100 can also be fixedly connected by bonding.

[0059] Furthermore, the sheets 200 stacked together along the thickness direction are welded or bonded together. In this embodiment, the sheets 200 stacked together along the thickness direction are bonded together. Specifically, an adhesive is provided between every two adjacent sheets 200, and the U-shaped monolithic structure 100 is bonded together by melting the adhesive at high temperature.

[0060] In this embodiment, as Figure 10 and Figure 11 As shown, the stator core of the axial flux motor also includes a slot wedge 300. The half-tooth portion 120 has a snap-fit ​​groove 121. The slot wedge 300 blocks the U-shaped opening and snaps into the snap-fit ​​groove 121 for fixation. The slot wedge 300 is configured to axially limit and fix the coil. By providing the snap-fit ​​groove 121 on the half-tooth portion 120, the slot wedge 300 can snap into the snap-fit ​​groove 121 when blocking the U-shaped opening. This allows the slot wedge 300 to be fixed to the half-tooth portion 120 while blocking the U-shaped opening. When the half-tooth portion 120 is snapped into the inner hole of the coil, the coil can be assembled and axially disengaged from the half-tooth portion 120, thus achieving axial limiting and fixing of the coil relative to the half-tooth portion 120.

[0061] like Figure 12As shown, in sheet 200, the second part 220 has two first notches 221 at one end away from the first part 210 along the rolling direction. The two first notches 221 extend inward from two outer end faces perpendicular to the rolling direction along a direction perpendicular to the rolling direction. Multiple first notches 221 stacked together along the thickness direction form a snap-fit ​​groove 121. The third part 230 has a second notch 231 at one end away from the first part 210 along the rolling direction. The second notch 231 extends inward from an outer end face perpendicular to the rolling direction along a direction perpendicular to the rolling direction. Multiple second notches 231 form a snap-fit ​​groove 121. By setting two first notches 221 on the second part 220 and two second notches 231 on the third part 230, when multiple second parts 220 and third parts 230 along the thickness direction in the multiple sheets 200 respectively form two half-tooth parts 120, the first notches 221 and the second notches 231 can jointly form two sets of snap-fit ​​grooves 121. The two sets of snap-fit ​​grooves 121 are respectively set on the two ends of the U-shaped single structure 100 along the radial direction. Each set of snap-fit ​​grooves 121 includes two snap-fit ​​grooves 121. The two snap-fit ​​grooves 121 in the same set of snap-fit ​​grooves 121 are respectively set on the two half-tooth parts 120 in the U-shaped single structure 100, so that the slot wedge 300 is simultaneously snapped and fixed with the two sets of snap-fit ​​grooves 121, thereby improving the snap-fit ​​effect between the slot wedge 300 and the half-tooth parts 120.

[0062] Specifically, such as Figure 10 , Figure 11 as well as Figure 13 As shown, the slotted wedge 300 includes a slotted wedge body 310, a first engaging portion 320, and a second engaging portion 330. The slotted wedge body 310 is used to limit and fix the coil along the axial direction. The first engaging portion 320 and the second engaging portion 330 are respectively connected to the two opposite ends of the slotted wedge body 310. The first engaging portion 320 and the second engaging portion 330 are respectively engaged and fixed with a set of engaging slots 121 in the U-shaped single-unit structure 100. By splitting the slotted wedge 300 into the slotted wedge body 310 and the first engaging portion 320 and the second engaging portion 330 respectively fixed at opposite ends of the slotted wedge body 310, the first engaging portion 320 and the second engaging portion 330 are respectively engaged and fixed with a set of engaging slots 121 in the U-shaped single-unit structure 100. This ensures the engaging effect between the slotted wedge 300 and the engaging slots 121 while avoiding direct contact between the slotted wedge body 310 and the engaging slots 121, thus improving the protection of the slotted wedge body 310.

[0063] In this embodiment, as Figure 14As shown, the first snap-fit ​​portion 320 has a first insertion groove 321, and the second snap-fit ​​portion 330 has a second insertion groove 331. The slot wedge body 310 is inserted and fixed into the first insertion groove 321 and the second insertion groove 331 respectively. By having the first insertion groove 321 on the first snap-fit ​​portion 320 and the second insertion groove 331 on the second snap-fit ​​portion 330, the opposite ends of the slot wedge body 310 are inserted and fixed into the first insertion groove 321 and the second insertion groove 331 respectively, which can improve the efficiency of assembling and disassembling the slot wedge 300 and the U-shaped single structure 100. When it is necessary to separate the slot wedge 300 and the U-shaped single structure 100 that are snapped together, the first snap-fit ​​portion 320 and the second snap-fit ​​portion 330 are pulled away from the slot wedge body 310 respectively, so that the first snap-fit ​​portion 320 and the second snap-fit ​​portion 330 disengage from the slot wedge body 310 and the snap-fit ​​groove 121 at the same time, and then the slot wedge body 310 is removed.

[0064] To further improve the performance of the axial flux motor using this axial flux motor stator core, in this embodiment, the slot wedge 300 is magnetically conductive. The magnetically conductive slot wedge 300 can connect the magnetic circuit of the U-shaped opening, effectively improving the electromagnetic characteristics at the U-shaped opening.

[0065] Understandably, in the structural design of axial flux motors, the existing teeth 102 of the existing stator core 11 are all fan-shaped. To ensure that the axial flux motor stator core provided in this embodiment can replace the existing stator core 11, when multiple sets of U-shaped single-unit structures 100 are assembled together, it is necessary to ensure that the structure formed by two adjacent half-teeth 120 is fan-shaped. Therefore, as... Figure 15 As shown, the semi-tooth portion 120 has an outer sidewall 122 fixedly connected to other semi-tooth portions 120 and an inner sidewall 123 disposed opposite to the outer sidewall 122. The outer sidewall 122 extends radially from the outside to the inside along the circle formed by the plurality of U-shaped single-unit structures 100 while tilting towards the inner sidewall 123. It should be noted that, regarding the tilt of the outer sidewall 122 relative to the inner sidewall 123, after the second part 220 and the third part 230 within the plurality of sheets 200 are bent and formed into the semi-tooth portion 120, the semi-tooth portion 120 is cut using a wire cutting process to obtain the tilted outer sidewall 122.

[0066] As an optional solution, such as Figure 16 and Figure 17As shown, there is an outwardly bent surface 130 between the half-tooth portion 120 and the yoke portion 110. When two adjacent half-tooth portions 120 constitute a stator single tooth, a clearance space is formed between the two outwardly bent surfaces 130. In the existing stator core 11, the connection area between the existing tooth portion 101 and the existing yoke portion 102 is a low magnetic flux density region. In this embodiment, the U-shaped single-unit structure 100 has an outwardly bent surface 130 due to the limitations of the processing technology. However, when two half-tooth portions 120 in two adjacent U-shaped single-unit structures 100 together constitute a stator single tooth, the clearance space formed by the two outwardly bent surfaces 130 is exactly where the low magnetic flux density region is located. Therefore, the clearance space formed by the two adjacent U-shaped single-unit structures 100 fixed together will not affect the performance of the axial flux motor stator core.

[0067] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stator core for an axial flux motor, characterized in that, include: Multiple sets of U-shaped single-unit structures (100), each set of U-shaped single-unit structures (100) is formed by bending sheets (200) stacked together along the thickness direction. Each sheet (200) includes a second part (220), a first part (210) and a third part (230) connected in sequence along the rolling direction. The second part (220) and the third part (230) are bent towards the same side relative to the first part (210). Each of the U-shaped single-unit structures (100) includes a yoke (110) and semi-toothed portions (120) located at both ends of the yoke (110) along the rolling direction. A plurality of first portions (210) together form the yoke (110), and a plurality of second portions (220) and a plurality of third portions (230) respectively form the semi-toothed portions (120). Multiple sets of the U-shaped single-unit structures (100) are arranged in a circular pattern around the axial direction in the radial plane with the U-shaped opening facing the same direction as the axial direction. The half-tooth portions (120) of two adjacent U-shaped single-unit structures (100) fit together to form a stator single tooth.

2. The stator core of the axial flux motor according to claim 1, characterized in that, The semi-tooth portion (120) has an outer sidewall (122) fixedly connected to the other semi-tooth portions (120) and an inner sidewall (123) disposed opposite to the outer sidewall (122). The outer sidewall (122) extends radially from the outside to the inside along the circle formed by the plurality of U-shaped single-unit structures (100) while tilting toward the direction close to the inner sidewall (123).

3. The stator core of the axial flux motor according to claim 1, characterized in that, The stator core of the axial flux motor also includes: The slotted wedge (300) has a snap-fit ​​groove (121) on the half tooth (120). The slotted wedge (300) blocks the U-shaped opening and snaps into the snap-fit ​​groove (121). The slotted wedge (300) is configured to limit and fix the coil along the axial direction.

4. The stator core of the axial flux motor according to claim 3, characterized in that, The second part (220) has two first notches (221) at one end away from the first part (210) along the rolling direction. The two first notches (221) extend inward from two outer end faces perpendicular to the rolling direction. The multiple first notches (221) stacked together along the thickness direction together form the snap-fit ​​groove (121). The third part (230) has a second notch (231) at one end away from the first part (210) along the rolling direction. The second notch (231) extends inward from the outer end face perpendicular to the rolling direction along a direction perpendicular to the rolling direction. Multiple second notches (231) together form the snap-fit ​​groove (121).

5. The stator core of the axial flux motor according to claim 3, characterized in that, The groove wedge (300) includes: A slotted wedge body (310) for limiting and fixing the coil along the axial direction; and The first snap-fit ​​portion (320) and the second snap-fit ​​portion (330) are respectively connected to the two ends of the groove wedge body (310) that are opposite to each other. The half tooth portion (120) is provided with snap-fit ​​grooves (121) at both ends of the radial direction of the circle formed by the plurality of U-shaped single structures (100). The first snap-fit ​​portion (320) and the second snap-fit ​​portion (330) are respectively snap-fitted and fixed with the snap-fit ​​grooves (121).

6. The stator core of the axial flux motor according to claim 5, characterized in that, The first snap-fit ​​part (320) is provided with a first insertion groove (321), and the second snap-fit ​​part (330) is provided with a second insertion groove (331). The groove wedge body (310) is inserted and fixed to the first insertion groove (321) and the second insertion groove (331) respectively.

7. The stator core of the axial flux motor according to claim 3, characterized in that, The slotted wedge (300) has a magnetic conduction function.

8. The stator core of the axial flux motor according to any one of claims 1 to 7, characterized in that, There is an outward bending surface (130) between the half tooth (120) and the yoke (110). When two adjacent half teeth (120) constitute the stator single tooth, a clearance space is formed between the two outward bending surfaces (130).

9. The stator core of the axial flux motor according to any one of claims 1 to 7, characterized in that, The two adjacent U-shaped single-unit structures (100) are welded or bonded together.

10. The stator core of an axial flux motor according to any one of claims 1 to 7, characterized in that, Sheets (200) stacked together along the thickness direction are welded or bonded together.

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