Axial flux motor stator core

Abstract

The application relates to the technical field of electric machines, in particular to an axial flux motor stator core. The axial flux motor stator core comprises multiple groups of U-shaped single body structures and an assembling base plate, each group of U-shaped single body structures is formed by bending and molding sheet materials stacked together along the thickness direction, the sheet materials comprise a second connecting part, a first connecting part and a third connecting part connected in sequence along the rolling direction, the U-shaped single body structure comprises a first structure part and a second structure part located at both ends of the first structure part along the rolling direction, multiple first connecting parts form the first structure part, multiple second connecting parts and multiple third connecting parts form the second structure part respectively, a plurality of assembling grooves are formed on one end surface of the assembling base plate along the radial direction, the multiple assembling grooves are circularly arranged along the axial direction of the assembling base plate, a clamping protrusion is formed between two adjacent assembling grooves, and each group of U-shaped single body structures is fixed in one assembling groove, and the clamping protrusion is combined with the second structure parts in two adjacent U-shaped single body structures to form a stator single tooth.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly 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. By punching and shearing a sawtooth structure 31 on the silicon steel sheets 3, the sawtooth structure 31 can form the existing teeth 101 for securing the coil windings when the silicon steel sheets 3 are wound into the existing stator core 11. The magnetic circuit within the existing stator core 11 is divided into a first connecting portion located in the existing teeth 101 and perpendicular to the rolling direction of the silicon steel sheets 3, and a second connecting portion 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 lowest iron loss along their rolling direction, and the worst magnetic properties and 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. Summary of the Invention

[0005] The purpose of this invention is to provide a stator core for an axial flux motor, thereby reducing magnetic losses when the magnetic flux passes through the stator core and improving 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 connecting part, a first connecting part and a third connecting part connected in sequence along the rolling direction, the second connecting part and the third connecting part are bent toward the same side relative to the first connecting part;

[0009] Each U-shaped monolithic structure includes a first structural portion and second structural portions located at both ends of the first structural portion along the rolling direction. Multiple first connecting portions collectively form the first structural portion, and multiple second connecting portions and multiple third connecting portions respectively form the second structural portion; and

[0010] The assembly chassis has multiple assembly slots on one radial end face. The multiple assembly slots are arranged in a circle around the axial direction of the assembly chassis. A locking protrusion is formed between two adjacent assembly slots. Each group of U-shaped single-unit structures is fixed in one assembly slot. The locking protrusion is simultaneously engaged with the second structural part in two adjacent U-shaped single-unit structures to form a stator single tooth.

[0011] As an optional solution, there is a bending portion between the first structural portion and the second structural portion, the first structural portion has a first outer surface, the second structural portion has a second outer surface, the bending portion has a third outer surface, and the third outer surface is connected to the first outer surface and the second outer surface respectively.

[0012] With the U-shaped monolithic structure fixed in the assembly groove, the first outer surface, the second outer surface, and the third outer surface simultaneously abut against the groove surface of the assembly groove.

[0013] As an optional solution, the stator core of the axial flux motor further includes:

[0014] Each of the second structural parts has a snap-fit ​​groove. The slot wedge blocks the U-shaped opening of the U-shaped single structure and simultaneously snaps and fixes itself with the snap-fit ​​grooves in the two second structural parts. The slot wedge is configured to limit and fix the coil located in the U-shaped opening along the axial direction.

[0015] As an optional solution, the second connecting part is provided with two first notches at one end away from the first connecting part along the rolling direction. The two first notches extend inward from two outer end faces perpendicular to the rolling direction in a direction perpendicular to the rolling direction. The first notches in the multiple second connecting parts stacked together together form the snap-fit ​​groove.

[0016] The third connecting portion has two second notches at one end away from the first connecting portion along the rolling direction. The two second notches extend inward from two outer end faces perpendicular to the rolling direction. The multiple second notches in the third connecting portions stacked together together form the snap-fit ​​groove.

[0017] As an optional solution, the slot wedge includes:

[0018] A slotted wedge body configured to limit and fix the coil along the axial direction; and

[0019] The first snap-fit ​​portion and the second snap-fit ​​portion are respectively connected to the two ends of the slotted wedge body that are opposite to each other.

[0020] The second structural part is provided with the snap-fit ​​groove at both ends along the radial direction, and the first snap-fit ​​part and the second snap-fit ​​part are snap-fitted and fixed with the snap-fit ​​groove respectively.

[0021] As an optional solution, the first snap-fit ​​part has a first insertion groove, and the second snap-fit ​​part has a second insertion groove. The two ends of the slot wedge body that are opposite to each other are respectively inserted and fixed into the first insertion groove and the second insertion groove.

[0022] As an optional feature, the slot wedge has a magnetic conductivity function.

[0023] As an optional option, the assembled chassis is produced by compression molding.

[0024] As an optional solution, the U-shaped monolithic structure is bonded or welded to the assembled chassis.

[0025] As an alternative, the sheets stacked together along the thickness direction can be welded or bonded together.

[0026] The beneficial effects of this invention are:

[0027] The axial flux motor stator core provided by this invention features multiple assembly slots arranged in a circular pattern along the axial direction on one end face of the assembly chassis. Each slot contains a U-shaped unit structure. Each U-shaped unit structure is formed by bending multiple sheets stacked together along the thickness direction. Each sheet includes a second connecting portion, a first connecting portion, and a third connecting portion connected sequentially along the rolling direction. The second and third connecting portions are bent towards the same side relative to the first connecting portion. The first connecting portions stacked together from the multiple sheets form the first structural part within the U-shaped unit structure. The second and third connecting parts respectively form the second structural part within the U-shaped single-unit structure, achieving the effect that the magnetic circuits within the second and first structural parts are in the same direction as the rolling direction of the sheet. When the assembly chassis is assembled with the U-shaped single-unit structure, the locking protrusion located between two adjacent assembly slots within the assembly chassis can simultaneously fit and fix with the second structural parts within two adjacent U-shaped single-unit structures to form a stator single tooth, meeting the requirements for clamping and fixing the coil. Moreover, by utilizing the characteristic that the magnetic circuits within the second and first structural parts are in the same direction as the rolling direction of the sheet, the magnetic loss within the stator core of the axial flux motor is reduced, thereby improving the performance of the axial flux motor. Attached Figure Description

[0028] 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;

[0029] Figure 2 This is one of the processing steps for the stator core of an axial flux motor in the existing technology;

[0030] 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;

[0031] Figure 4 This is the third step in the processing of the stator core of an axial flux motor in the existing technology;

[0032] Figure 5 This is a schematic diagram of the magnetic circuit inside the stator core of an axial flux motor in the prior art;

[0033] Figure 6 This is a schematic diagram of the structure of the stator core of the axial flux motor provided in an embodiment of the present invention;

[0034] Figure 7 yes Figure 6 A magnified view of a section at point A in the middle;

[0035] Figure 8 This is an exploded view of the stator core of the axial flux motor provided in an embodiment of the present invention;

[0036] Figure 9 This is a first structural schematic diagram of the U-shaped monolithic structure provided in an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the second structure of the U-shaped monolithic structure provided in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the sheet material in a bent state provided in an embodiment of the present invention;

[0039] Figure 12 This is a schematic diagram of the groove wedge structure provided in an embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the sheet material in its unbent state according to an embodiment of the present invention;

[0041] Figure 14 This is a cross-sectional schematic diagram of the groove wedge provided in an embodiment of the present invention.

[0042] In the picture:

[0043] 1. Existing stator assembly; 11. Existing stator core; 101. Existing gear teeth; 102. Existing yoke; 2. Existing rotor assembly; 3. Silicon steel sheets; 31. Serrated structure;

[0044] 100. U-shaped single-unit structure; 110. First structural part; 111. First outer surface; 120. Second structural part; 121. Snap-fit ​​groove; 122. Second outer surface; 130. Bending part; 131. Third outer surface;

[0045] 200. Assemble the chassis; 210. Assemble the slot; 220. Locking protrusion;

[0046] 300, sheet material; 310, first connecting part; 320, second connecting part; 321, first notch; 330, third connecting part; 331, second notch;

[0047] 400, slotted wedge; 410, slotted wedge body; 420, first snap-fit ​​part; 421, first insertion slot; 430, second snap-fit ​​part; 431, second insertion slot. Detailed Implementation

[0048] 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 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, and not all of the structures.

[0049] In the description of this invention, 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 invention based on the specific circumstances.

[0050] 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.

[0051] 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] 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, such as Figures 2-5As 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.

[0053] To solve the above problems, such as Figures 6 to 11 As shown, this embodiment provides a stator core for an axial flux motor. The axial flux motor stator core includes multiple sets of U-shaped single-unit structures 100 and an assembly chassis 200. Each U-shaped single-unit structure 100 is formed by bending sheets 300 stacked together along the thickness direction. Each sheet 300 includes a second connecting portion 320, a first connecting portion 310, and a third connecting portion 330 connected sequentially along the rolling direction. The second connecting portion 320 and the third connecting portion 330 are bent towards the same side relative to the first connecting portion 310. Each U-shaped single-unit structure 100 includes a first structural portion 110 and second structural portions located at both ends of the first structural portion 110 along the rolling direction. The first structural part 110 is composed of multiple first connecting parts 310, and multiple second connecting parts 320 and multiple third connecting parts 330 respectively form the second structural part 120. The assembly chassis 200 has multiple assembly slots 210 on one end face along the radial direction. The multiple assembly slots 210 are arranged in a circle around the axial direction of the assembly chassis 200. A locking protrusion 220 is formed between two adjacent assembly slots 210. Each U-shaped single structure 100 is fixed in one assembly slot 210. The locking protrusion 220 is simultaneously attached to the second structural part 120 in two adjacent U-shaped single structures 100 to form a stator single tooth.

[0054] The stator core of the axial flux motor is formed by setting multiple assembly slots 210 on one radial end face of the assembly chassis 200, so that the multiple assembly slots 210 are arranged in a circle around the axial direction, ensuring that a U-shaped single structure 100 is fixed in each assembly slot 210. Each U-shaped single structure 100 is formed by bending multiple sheets 300 stacked together along the thickness direction. Each sheet 300 includes a second connecting part 320, a first connecting part 310, and a third connecting part 330 connected in sequence along the rolling direction. The second connecting part 320 and the third connecting part 330 are bent toward the same side relative to the first connecting part 310. The first connecting parts 310 stacked together from the multiple sheets 300 form the first structural part 110 within the U-shaped single structure 100. The second connecting part 320 and the third connecting part 330 respectively form the second structural part 120 within the U-shaped single structure 100, achieving the effect that the magnetic circuits within the second structural part 120 and the first structural part 110 are in the same direction as the rolling direction of the sheet 300. When the assembly chassis 200 is assembled with the U-shaped single structure 100, the locking protrusion 220 located between two adjacent assembly slots 210 within the assembly chassis 200 can simultaneously fit and fix with the second structural parts 120 within the two adjacent U-shaped single structures 100 to form a stator single tooth, meeting the clamping and fixing requirements of the coil. Moreover, by utilizing the characteristic that the magnetic circuits within the second structural part 120 and the first structural part 110 are in the same direction as the rolling direction of the sheet 300, the magnetic loss within the stator core of the axial flux motor is reduced, thereby improving the performance of the axial flux motor.

[0055] As an optional option, the assembly chassis 200 is manufactured from soft magnetic composite material using a compression molding process. Soft magnetic composite (SMC) is a composite material composed of magnetic powder and polymer resin. The magnetic powder is typically powder of metals such as iron, nickel, and cobalt, possessing good magnetic permeability and magnetic saturation; the polymer resin, such as epoxy resin or polyester resin, is used to cure and enhance the mechanical properties of the material. In addition to its excellent soft magnetic properties, the soft magnetic composite material also exhibits superior mechanical properties such as high strength, rigidity, and heat resistance. The soft magnetic properties include high permeability, low hysteresis loss, and low magnetic permeability. Furthermore, the compression molding process not only enables rapid production of the assembly chassis 200, improving production efficiency, but also ensures the processing accuracy of the assembly chassis 200, maintaining consistency in specifications between each assembly chassis 200.

[0056] Furthermore, in this embodiment, sheet 300 is formed by rolling silicon steel. Silicon steel possesses excellent magnetic properties, including high permeability and low iron loss. Silicon steel is primarily used to manufacture the cores of various electric motors, generators, and transformers, and is an indispensable functional metal material in the power, electronics, and military industries. It is also a key material for improving the efficiency and reducing energy consumption of power equipment.

[0057] As an optional solution, such as Figure 10 As shown, a bending portion 130 exists between the first structural part 110 and the second structural part 120. The first structural part 110 has a first outer surface 111, the second structural part 120 has a second outer surface 122, and the bending portion 130 has a third outer surface 131. The third outer surface 131 is connected to the first outer surface 111 and the second outer surface 122, respectively. When the U-shaped single structure 100 is fixed in the assembly groove 210, the first outer surface 111, the second outer surface 122, and the third outer surface 131 simultaneously abut against the groove surface of the assembly groove 210. By ensuring that the first outer surface 111, the second outer surface 122, and the third outer surface 131 simultaneously abut against the groove surface of the assembly groove 210 while the U-shaped single structure 100 is fixed in the assembly groove 210, the fixing effect between the U-shaped single structure 100 and the assembly chassis 200 can be guaranteed, avoiding gaps between the U-shaped single structure 100 and the assembly chassis 200, and further reducing the magnetic loss of the axial flux motor.

[0058] Optionally, the U-shaped monolithic structure 100 is bonded or welded to the assembly chassis 200. It should be noted that in this embodiment, the U-shaped monolithic structure 100 is welded to the assembly chassis 200, specifically by welding the first outer surface 111, the second outer surface 122, and the third outer surface 131 to the groove surface of the assembly groove 210. In other embodiments, the U-shaped monolithic structure 100 and the assembly chassis 200 can also be fixed by bonding. Specifically, adhesive is applied between the first outer surface 111 and the corresponding groove surface of the assembly groove 210, the second outer surface 122 and the corresponding groove surface of the assembly groove 210, and the third outer surface 131 and the corresponding groove surface of the assembly groove 210, respectively. The adhesive is melted at high temperature to bond the U-shaped monolithic structure 100 to the assembly chassis 200.

[0059] In an alternative embodiment, such as Figure 9 and Figure 12As shown, the stator core of the axial flux motor also includes slot wedges 400. Each second structural part 120 has a snap-fit ​​groove 121. The slot wedges 400 block the U-shaped opening of the U-shaped single structure 100 and simultaneously snap-fit ​​with the snap-fit ​​grooves 121 in the two second structural parts 120. The slot wedges 400 are configured to axially limit and fix the coil located in the U-shaped opening. By providing snap-fit ​​grooves 121 on each second structural part 120, the slot wedges 400 can simultaneously block the U-shaped opening of the U-shaped single structure 100 and snap-fit ​​with the snap-fit ​​grooves 121 in the two second structural parts 120, thus axially limiting and fixing the coil located in the U-shaped opening, achieving clamping and fixing of the coil to the stator core of the axial flux motor.

[0060] Specifically, Figure 11 and Figure 13 As shown, the second connecting portion 320 has two first notches 321 at one end away from the first connecting portion 310 along the rolling direction. The two first notches 321 extend inward from two outer end faces perpendicular to the rolling direction. The first notches 321 in the stacked second connecting portions 320 together form a snap-fit ​​groove 121. The third connecting portion 330 has two second notches 331 at one end away from the first connecting portion 310 along the rolling direction. The two second notches 331 extend inward from two outer end faces perpendicular to the rolling direction. The second notches 331 in the stacked third connecting portions 330 together form a snap-fit ​​groove 121. By providing two first notches 321 at one end of the second connecting portion 320 away from the first connecting portion 310 along the rolling direction, the two first notches 321 extend inward from the two outer end faces perpendicular to the rolling direction in a direction perpendicular to the rolling direction, and by providing two second notches 331 at one end of the third connecting portion 330 away from the first connecting portion 310 along the rolling direction, the two second notches 331 extend inward from the two outer end faces perpendicular to the rolling direction in a direction perpendicular to the rolling direction, when multiple sheets 300 are stacked together along the thickness direction, the stacked multiple first notches 321 and multiple second notches 331 respectively assemble the snap-fit ​​groove 121.

[0061] In this embodiment, the second structural part 120 has a first inner surface disposed opposite to the second outer surface 122. Taking the direction in which the first inner surface and the second outer surface 122 are disposed opposite each other as the first direction, a snap-fit ​​groove 121 extends from the first inner surface along the first direction toward one end near the second outer surface 122. The groove depth of the snap-fit ​​groove 121 along the first direction does not exceed half the thickness of the second structural part 120 along the first direction, to ensure the structural strength of the second structural part 120. It should be noted that in this embodiment, the groove depth of the snap-fit ​​groove 121 along the first direction is half the thickness of the second structural part 120 along the first direction. In other embodiments, the groove depth of the snap-fit ​​groove 121 along the first direction can also be arbitrarily adjusted within the range not exceeding half the thickness of the second structural part 120 along the first direction; this embodiment does not impose a specific limitation.

[0062] Combination Figure 12 The specific structure of the slotted wedge 400 is described below. The slotted wedge 400 includes a slotted wedge body 410, a first snap-fit ​​part 420, and a second snap-fit ​​part 430. The slotted wedge body 410 is configured to limit and fix the coil along the axial direction. The first snap-fit ​​part 420 and the second snap-fit ​​part 430 are respectively connected to the two ends of the slotted wedge body 410 that are opposite to each other. The second structural part 120 is provided with snap-fit ​​grooves 121 at both ends along the radial direction. The first snap-fit ​​part 420 and the second snap-fit ​​part 430 are snap-fitted and fixed with the snap-fit ​​grooves 121 respectively. Since the two first notches 321 are located at the two ends of the second connecting portion 320 perpendicular to the rolling direction, and the two second notches 331 are located at the two ends of the second connecting portion 320 perpendicular to the rolling direction, when multiple sheets 300 are stacked together to form a U-shaped single structure 100, the two ends of the second structural portion 120 composed of multiple second connecting portions 320 along the radial direction will respectively form snap-fit ​​grooves 121, and the two ends of the second structural portion 120 composed of multiple third connecting portions 330 along the radial direction will respectively form snap-fit ​​grooves 121. By splitting the slot wedge 400 into a slot wedge body 410 and a first snap-fit ​​portion 420 and a second snap-fit ​​portion 430 respectively fixed at the two opposite ends of the slot wedge body 410, the first snap-fit ​​portion 420 and the second snap-fit ​​portion 430 are respectively snap-fitted and fixed with the two snap-fit ​​grooves 121 of the two second structural portions 120 along the radial direction, a stable snap-fit ​​fixation between the slot wedge 400 and the U-shaped single structure 100 can be achieved.

[0063] It should be noted that in a set of U-shaped single-unit structures 100, a total of four snap-fit ​​grooves 121 are provided on the two second structural parts 120. The two snap-fit ​​grooves 121 located on the inner side along the radial direction are the first group, and the two snap-fit ​​grooves 121 located on the outer side along the radial direction are the second group. The first snap-fit ​​part 420 is snap-fitted and fixed with the first group of snap-fit ​​grooves 121, and the second snap-fit ​​part 430 is snap-fitted and fixed with the second group of snap-fit ​​grooves 121.

[0064] Specifically, such as Figure 14As shown, a first insertion groove 421 is provided in the first snap-fit ​​part 420, and a second insertion groove 431 is provided in the second snap-fit ​​part 430. The two ends of the slot wedge body 410, which are arranged opposite to each other, are respectively inserted and fixed with the first insertion groove 421 and the second insertion groove 431. When it is necessary to insert and fix the slot wedge 400 to the U-shaped single structure 100, firstly, the first snap-fit ​​part 420 is snapped and fixed with the first set of snap-fit ​​grooves 121, and the first insertion groove 421 in the first snap-fit ​​part 420 is radially outward. Then, one end of the slot wedge body 410 is radially inserted into the first insertion groove 421 from the outside, realizing the assembly of the slot wedge body 410 and the first snap-fit ​​part 420. Finally, while the second snap-fit ​​part 430 is snapped and fixed with the second set of snap-fit ​​grooves 121 from the outside, the second insertion groove 431 in the second snap-fit ​​part 430 is inserted and fixed with the slot wedge body 410. When it is necessary to separate the assembled slot wedge 400 from the U-shaped single structure 100, the first locking part 420 is pulled out radially inward and the second locking part 430 is pulled out radially outward, and finally the slot wedge body 410 is removed radially.

[0065] Furthermore, to further improve the performance of the axial flux motor using this axial flux motor stator core, in this embodiment, the slot wedge 400 is magnetically conductive. The magnetically conductive slot wedge 400 can connect the magnetic circuit of the U-shaped opening within the U-shaped monolithic structure 100, effectively improving the electromagnetic characteristics at the U-shaped opening.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. 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 the present invention should be included within the scope of protection of the claims of the present invention.

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 (300) stacked together along the thickness direction. Each sheet (300) includes a second connecting part (320), a first connecting part (310) and a third connecting part (330) connected in sequence along the rolling direction. The second connecting part (320) and the third connecting part (330) are bent toward the same side relative to the first connecting part (310). Each U-shaped single-unit structure (100) includes a first structural part (110) and second structural parts (120) located at both ends of the first structural part (110) along the rolling direction. A plurality of first connecting parts (310) together constitute the first structural part (110), and a plurality of second connecting parts (320) and a plurality of third connecting parts (330) respectively constitute the second structural part (120). An assembly chassis (200) is provided with a plurality of assembly slots (210) on one radial end face. The plurality of assembly slots (210) are arranged in a circle around the axial direction of the assembly chassis (200). A locking protrusion (220) is formed between two adjacent assembly slots (210). Each group of U-shaped single-unit structures (100) is fixed in one assembly slot (210). The locking protrusion (220) is simultaneously engaged with the second structural part (120) in two adjacent U-shaped single-unit structures (100) to form a stator single tooth.

2. The stator core of the axial flux motor according to claim 1, characterized in that, A bending portion (130) exists between the first structural part (110) and the second structural part (120). The first structural part (110) has a first outer surface (111), the second structural part (120) has a second outer surface (122), and the bending portion (130) has a third outer surface (131). The third outer surface (131) is connected to the first outer surface (111) and the second outer surface (122) respectively. With the U-shaped monolithic structure (100) fixed in the assembly groove (210), the first outer surface (111), the second outer surface (122), and the third outer surface (131) simultaneously abut against the groove surface of the assembly groove (210).

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 slot wedge (400) has a snap-fit ​​groove (121) in each of the second structural parts (120). The slot wedge (400) blocks the U-shaped opening of the U-shaped single structure (100) and simultaneously snaps and fixes itself with the snap-fit ​​groove (121) in the two second structural parts (120). The slot wedge (400) is configured to limit and fix the coil located in the U-shaped opening along the axial direction.

4. The stator core of the axial flux motor according to claim 3, characterized in that, The second connecting portion (320) has two first notches (321) at one end away from the first connecting portion (310) along the rolling direction. The two first notches (321) extend inward from two outer end faces perpendicular to the rolling direction. The first notches (321) in the multiple second connecting portions (320) stacked together together form the snap-fit ​​groove (121). The third connecting portion (330) has two second notches (331) at one end away from the first connecting portion (310) along the rolling direction. The two second notches (331) extend inward from two outer end faces perpendicular to the rolling direction. The second notches (331) in the multiple third connecting portions (330) stacked together 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 (400) includes: A slotted wedge body (410) configured to limit and fix the coil along the axial direction; and The first snap-fit ​​portion (420) and the second snap-fit ​​portion (430) are respectively connected to the two ends of the slot wedge body (410) that are opposite to each other; The second structural part (120) is provided with the snap-fit ​​groove (121) at both ends along the radial direction, and the first snap-fit ​​part (420) and the second snap-fit ​​part (430) are snap-fitted and fixed with the snap-fit ​​groove (121) respectively.

6. The stator core of the axial flux motor according to claim 5, characterized in that, The first snap-fit ​​part (420) has a first insertion groove (421) and the second snap-fit ​​part (430) has a second insertion groove (431). The two ends of the slot wedge body (410) are respectively inserted and fixed into the first insertion groove (421) and the second insertion groove (431).

7. The stator core of the axial flux motor according to claim 3, characterized in that, The slotted wedge (400) has a magnetic conduction function.

8. The stator core of the axial flux motor according to claim 1, characterized in that, The assembled chassis (200) is produced by compression molding.

9. The stator core of the axial flux motor according to claim 1, characterized in that, The U-shaped monolithic structure (100) is bonded or welded to the assembled chassis (200).

10. The stator core of the axial flux motor according to claim 1, characterized in that, Sheets (300) stacked together along the thickness direction are welded or bonded together.

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