Stator core

Abstract

The utility model discloses a stator core, comprising a yoke part which extends along the circumferential direction and is provided with a plurality of first connecting parts which are arranged at the inner side of the yoke part along the circumferential direction at intervals; the tooth part comprises a plurality of single teeth, the single teeth are arranged at intervals in the circumferential direction and correspond to the first connecting parts in a one-to-one mode, and any two adjacent single teeth are not connected; wherein each single tooth is provided with a second connecting part, the second connecting parts are arranged at the ends, close to the yoke part, of the single teeth in the radial direction, the second connecting parts are configured to be capable of being connected with the first connecting parts in the axial direction so that the tooth parts can be detachably connected with the yoke part, and the first connecting parts are configured to be capable of limiting the second connecting parts to move in the radial direction and surround the axial direction in the circumferential direction; the radial direction is perpendicular to the axial direction. The stator core provided by the utility model is convenient to produce, manufacture and carry, and can improve the electromagnetism of a motor and the assembly efficiency of copper wires.

Description

Technical Field

[0001] The utility model relates to the technical field of stator cores, in particular to a stator core. Background Art

[0002] At present, in order to realize the copper wire assembly of continuous wave winding, most manufacturers adopt the solution that the stator core teeth and yoke are separated but the stator teeth are integrated (Scheme 1). For Scheme 1, i.e. the continuous wave winding core solution, the thickness of the connection part of the teeth is small, which makes it difficult to process and manufacture, which is not conducive to the handling of the product, and the electromagnetic performance of the motor is poor due to the connection of the teeth.

[0003] For motor stators with U-shaped hairpin windings (Hair-pin) / I-shaped hairpin windings (I-pin), most manufacturers adopt the assembly method of winding copper wire by shrinking the opening of the motor stator core teeth and inserting the copper wire from one axial end to the other end of the motor stator core (Scheme 2). For Scheme 2, that is, the hair-pin / I-pin winding type core adopts the wire insertion method, the assembly efficiency is low.

[0004] Patent document CN201549939U discloses a motor stator combined punching sheet. The connection between the yoke and the tooth part of this solution is not firm and is easy to loosen; the tooth part is independent and scattered, and there are problems such as complex assembly process of the yoke and the tooth part and low assembly efficiency; and this solution is mainly applied to round wire winding motors and cannot be applied to continuous winding motors.

[0005] Patent document CN2018415933U discloses a stator core punching sheet, a motor stator and a motor. The scheme has interconnected partial teeth and non-interconnected partial teeth, and the molding is complex. Some of the teeth are closed-end connected, and the motor will have magnetic leakage at the connection part, affecting the motor performance; the connection part of the teeth is small in size, and the punching sheet is prone to damage and deformation during production, handling and bending. Patent document CN106160272A discloses a stator structure for reducing cogging torque. The connection part of the teeth connecting the punching sheet in this scheme is small in size, and some of the teeth are closed-end connected. There are also problems that the punching sheet is prone to damage and deformation during production, handling and bending, and magnetic leakage occurs at the connection part of the motor, affecting the motor performance. Summary of the invention

[0006] The utility model aims to solve the problem that the yoke and tooth assembly process of the stator core is complicated and the assembly process efficiency is low, and the tooth connection leads to poor electromagnetic performance of the motor. The utility model provides a stator core that is easy to process and transport, has a simple tooth manufacturing process and high assembly efficiency.

[0007] To solve the above technical problems, an embodiment of the utility model discloses a stator core, comprising: a yoke portion, extending in a circumferential direction, and having a plurality of first connection portions, wherein the plurality of first connection portions are arranged at intervals along the circumferential direction on the inner side of the yoke portion; a tooth portion, comprising a plurality of single teeth, wherein the plurality of single teeth are arranged at intervals along the circumferential direction and correspond one-to-one to the plurality of first connection portions, wherein any two adjacent single teeth are not connected; wherein each of the single teeth has a second connection portion, wherein the second connection portion is arranged at one end of the single tooth close to the yoke portion in a radial direction, wherein the second connection portion is configured to be connected to the first connection portion in an axial direction so that the tooth portion and the yoke portion are detachably connected, and wherein the first connection portion is configured to limit the radial movement of the second connection portion, wherein the circumferential direction surrounds the axial direction, and the radial direction is perpendicular to the axial direction.

[0008] By adopting the above technical solution, the embodiment of the present application completely separates the tooth part from the yoke part, and adopts a tooth part with multiple completely independent single teeth, so that the multiple single teeth of the tooth part are completely unconnected, which can not only avoid magnetic leakage, but also improve the material utilization rate of the tooth part. Compared with the small-sized connecting part of the tooth part in the prior art (such as the patent documents CN2018415933U and CN106160272A mentioned above), the completely independent single teeth of the embodiment of the present application are easier to produce, transport and assemble.

[0009] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a stator core, the first connecting part includes a groove, the second connecting part includes a convex part adapted to the groove, the groove extends along the axial direction, the convex part extends along the axial direction, and the convex part is configured to be able to be accommodated in the groove from one axial side of the groove so that the single tooth is connected to the yoke.

[0010] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a stator core, the groove includes a limiting portion, and along the circumferential direction, the limiting portion is protruding from the inner walls on both sides of the groove; the convex portion includes a positioning groove, and along the circumferential direction, the positioning groove is provided on the outer walls on both sides of the convex portion, and the limiting portion is used to be accommodated in the positioning groove along the axial direction to limit the movement of the single tooth along the radial direction relative to the yoke.

[0011] By adopting the above technical solution, when the protrusion (i.e. the second connecting part) is installed in the groove (i.e. the first connecting part), the limiting part is accommodated in the positioning groove to limit the radial movement of the single tooth relative to the yoke, thereby making the fit between the tooth part and the yoke part more secure.

[0012] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a stator core, each of the single teeth also includes a third connecting portion, the third connecting portion is arranged at one end of the single tooth close to the yoke portion, the third connecting portion extends along the axial direction, and is configured to be used for connecting a winding tooling.

[0013] By adopting the above technical solution, the embodiment of the present application meets the assembly requirements of the continuous wave winding copper wire and is easy to process and transport. In addition, during the assembly process of the stator core, the tooth portion is installed on the winding tooling through the third connecting portion, so that the winding copper wire can be inserted from the outside, thereby improving the production efficiency of the copper wire insertion manufacturing process.

[0014] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a stator core, each of the single teeth also includes a first punching part and a second punching part, along the axial direction, the second punching part is arranged on opposite sides of the first punching part, and the third connecting part is arranged on the second punching part; wherein, the first punching part includes a plurality of first single-tooth punchings, each of the first single-tooth punchings is provided with a first connecting piece at one end close to the yoke along the radial direction, and the second punching part includes a plurality of second single-tooth punchings, each of the second single-tooth punchings is provided with a first connecting piece at one end close to the yoke along the radial direction, and the first connecting piece of each second single-tooth punching has a second connecting piece; the plurality of first single-tooth punchings and the plurality of second single-tooth punchings are respectively stacked along the axial direction, so that the plurality of first connecting pieces are stacked along the axial direction to form the second connecting part, and the plurality of second connecting pieces are stacked along the axial direction to form the third connecting part.

[0015] By adopting the above technical solution, the embodiment of the present application obtains a single tooth by stacking a single single-tooth punch (for example, a first single-tooth punch and a second single-tooth punch), which simplifies the manufacturing of the tooth part and is beneficial to improving the utilization rate of materials in the process.

[0016] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a stator core, wherein along the radial direction, the third connecting portion is arranged at one end of the single tooth close to the yoke portion, the second connecting piece includes an opening, and the third connecting portion includes a process groove formed by stacking multiple openings along the axial direction.

[0017] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a stator core, wherein along the axial direction, the length of the process groove is comprised between 4 mm and 8 mm.

[0018] The adoption of the above technical solution facilitates the installation of the tooth portion of the embodiment of the present application on the winding tooling, which is beneficial to improving the assembly efficiency of the stator core.

[0019] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a stator core, which also includes a shell extending along the circumferential direction, and the yoke is sleeved in the shell.

[0020] By adopting the above technical solution, in the embodiment of the present application, the teeth are installed on the yoke, and the yoke is installed in the housing, so that the stator core is easier to produce, transport and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A front view of a stator core according to an embodiment of the utility model is shown;

[0022] Figure 2 A three-dimensional diagram showing a yoke and a tooth portion of a stator core according to an embodiment of the utility model, wherein the tooth portion is installed in the yoke portion;

[0023] Figure 3 A three-dimensional diagram showing two adjacent single teeth of a tooth portion of a stator core according to an embodiment of the utility model;

[0024] Figure 4 The front view of two adjacent single teeth of the tooth portion of the stator core of the utility model embodiment is shown; wherein, Figure 4 (a) in the figure represents the second single-tooth punch. Figure 4 (b) represents the first single-tooth punch;

[0025] Figure 5 A three-dimensional view showing a yoke portion of a stator core according to an embodiment of the utility model;

[0026] Figure 6 Show Figure 1 A partial enlarged view of the middle A area;

[0027] Figure 7 A three-dimensional diagram showing the teeth of the stator core and the winding tooling of the embodiment of the utility model, wherein the teeth are installed on the winding tooling;

[0028] Figure 8 A three-dimensional diagram showing a winding tool according to an embodiment of the utility model. DETAILED DESCRIPTION

[0029] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0031] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0033] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] refer to Figure 1 An embodiment of the present application provides a stator core 1, comprising a yoke 10, a tooth portion 20 and a housing 30.

[0036] The yoke 10 has a plurality of first connecting portions 11, the tooth portion 20 includes a plurality of single teeth 21, and the housing 30 is circumferentially (eg Figure 1 The yoke 10 is extended in the housing 30 (in the R direction), and the yoke 10 is sleeved in the housing 30. Exemplarily, the housing 30 and the yoke 10 are an integrated structure; but not limited thereto, the embodiment of the present application does not specifically limit the connection relationship between the yoke 10 and the housing 30.

[0037] like Figure 1 As shown, the yoke 10 is circumferentially (eg Figure 1 The plurality of first connecting portions 11 are arranged at intervals along the circumferential direction on the inner side of the yoke 10, and the plurality of single teeth 21 are arranged at intervals along the circumferential direction, and the plurality of single teeth 21 are arranged to correspond to the plurality of first connecting portions 11 one by one. That is, any two adjacent single teeth 21 among the plurality of single teeth 21 are completely unconnected, thereby avoiding magnetic leakage between adjacent single teeth 21, which affects the performance of the motor equipped with the stator core 1 of the embodiment of the present application.

[0038] Specifically, refer to Figure 2 Combined with Figure 1 Each single tooth 21 has a second connecting portion 22. Figure 1 The second connecting portion 22 is provided at one end 2101 of the single tooth 21 close to the yoke 10, and the second connecting portion 22 is configured to be able to move in the axial direction (as shown in the X direction). Figure 2 The tooth portion 20 is connected to the yoke portion 10 in a detachable manner.

[0039] In other words, when the stator core 1 provided in the embodiment of the present application is assembled, each single tooth 21 of the tooth portion 20 can be along the axis (such as Figure 2 The plurality of single teeth 21 are provided on the plurality of first connecting portions 11 on the inner side of the yoke 10 through the second connecting portion 22. Since the plurality of first connecting portions 11 are arranged along the circumferential direction (as shown in the Z direction) Figure 1 The plurality of single teeth 21 correspond to the plurality of first connecting portions 11 one by one, so that the tooth portion 20 of the stator core of the embodiment of the present application has a plurality of completely independent single teeth 21, and the tooth portion 20 is arranged on the inner side of the yoke portion 10. For example, Figure 2 As shown, the circumferential direction R surrounds the axial direction Z, and the radial direction X is perpendicular to the axial direction Z.

[0040] In summary, the tooth portion 20 of the present application is separated from the yoke portion 10, and the tooth portion 20 has a plurality of completely independent single teeth 21, and the multiple single teeth 21 of the tooth portion 20 are completely unconnected, which can avoid magnetic leakage and improve the material utilization rate of the tooth portion 20. Compared with the small-sized connecting part of the tooth portion in the prior art (such as the patent documents CN2018415933U and CN106160272A mentioned above), the completely independent single teeth 21 of the embodiment of the present application are easier to produce, transport and assemble.

[0041] The specific structure of the tooth portion 20 will be described in detail below with reference to the accompanying drawings.

[0042] In some possible implementations, reference Figure 3 and Figure 4 In (a) and (b), each single tooth 21 in the embodiment of the present application further includes a first punching portion 211 and a second punching portion 212 .

[0043] Specifically, continue to refer to Figure 3 , along the axial direction (such as Figure 3 The second punching portion 212 is disposed on opposite sides of the first punching portion 211 , and the third connecting portion 23 is disposed on the second punching portion 212 .

[0044] For example, Figure 3 As shown, the two axial ends of the single tooth 21 include a second punching portion 212, and the middle portion includes a first punching portion 211, but is not limited to this. The second punching portion 212 can also be arranged at any one of the two axial ends of the single tooth 21, for example, the second punching portion 212 is arranged at the upper end of the single tooth 21 in the axial direction, or the second punching portion 212 is arranged at the lower end of the single tooth 21 in the axial direction.

[0045] Continue to refer Figure 4 Combine (a) and (b) Figure 3 , among which, Figure 4 As shown in (b), the first punching sheet portion 211 includes a plurality of first single-tooth punching sheets 2111, each of which is radially (eg Figure 4 A first connecting member 2201 is provided at one end of the yoke (not shown in the figure) near the yoke. Figure 4 As shown in (a), the second punching sheet portion 212 includes a plurality of second single-tooth punching sheets 2121, and each second single-tooth punching sheet 2121 is provided with a first connecting member 2201 at one end thereof radially close to the yoke portion (not shown in the figure). In addition, the first connecting member 2201 of each second single-tooth punching sheet 2121 has a second connecting member 2202. The plurality of first single-tooth punching sheets 2111 and the plurality of second single-tooth punching sheets 2121 are respectively axially (as shown in Figure 3The plurality of first connecting members 2201 are stacked along the axial direction to form a second connecting portion 22, and the plurality of second connecting members 2202 are stacked along the axial direction to form a third connecting portion 23.

[0046] In other words, the single tooth 21 of the embodiment of the present application includes a first single-tooth punch 2111 and a second single-tooth punch 2121 stacked in sequence, and the second punch portion 212 formed by stacking the second single-tooth punch 2121 is arranged in the axial direction (such as Figure 3 On both sides (shown in the Z direction).

[0047] The embodiment of the present application obtains the single tooth 21 by stacking single single-tooth punching sheets (such as the first single-tooth punching sheet 2111 and the second single-tooth punching sheet 2121), which simplifies the manufacturing of the tooth portion 20 and helps to improve the utilization rate of materials in the process.

[0048] In some possible implementations, reference Figure 5 Combined with Figure 1 and Figure 3 The first connection portion 11 includes a groove 111 , and the second connection portion 22 includes a protrusion 221 matched with the groove 111 .

[0049] Specifically, the groove 111 is axially (eg Figure 5 The convex portion 221 extends in the axial direction (as shown in the Z direction) and the ... Figure 3 The protrusion 221 is configured to be accommodated in the groove 111 from one axial side of the groove 111, so that the single tooth 21 is connected to the yoke 10. That is, the plurality of single teeth 21 of the embodiment of the present application are arranged on the plurality of grooves 111 on the inner side of the yoke 10 through the protrusion 221, so that the tooth 20 is installed on the inner side of the yoke 10 in a detachable manner.

[0050] In some possible implementations, reference Figure 6 Combined with Figure 4 The groove 111 of the embodiment of the present application includes a limiting portion 1111, along the circumferential direction (such as Figure 6 The limiting portion 1111 is protruding from the inner walls on both sides of the groove 111, that is, the cross-sectional shape of the groove 111 is an I-shape. Similarly, the convex portion 221 includes a positioning groove 2211. Along the circumferential direction, the positioning groove 2211 is provided on the outer walls on both sides of the convex portion 221, that is, the cross-sectional shape of the convex portion 221 is an I-shape that matches the cross-sectional shape of the groove 1111.

[0051] When the protrusion 221 is installed in the groove 111, the limiting portion 1111 is accommodated in the positioning groove 2211 to limit the single tooth 21 from moving in the radial direction (such as Figure 6The tooth portion 20 (shown in the X direction) moves relative to the yoke 10, thereby making the fit between the tooth portion 20 and the yoke 10 more secure.

[0052] In some possible implementations, continue to refer to Figure 3 Combined with Figure 7 Each single tooth 21 of the embodiment of the present application further includes a third connecting portion 23. The third connecting portion 23 is axially (eg Figure 3 The third connecting portion 23 extends in the Z direction, and the third connecting portion 23 is configured to be used for connecting the winding tool 40 (described later in detail).

[0053] As mentioned above, combined with Figure 4 (a) and (b) and Figure 3 The second single-tooth punch 2121 is different from the first single-tooth punch 2111 in that the first connecting member 2201 provided on the second single-tooth punch 2121 has a second connecting member 2202, and when the second single-tooth punch 2121 is stacked to form the second punch portion 212, the second connecting member 2202 provided on the first connecting member 2201 of the second single-tooth punch 2121 is stacked to form the third connecting portion 23. That is, the third connecting portion 23 includes the second connecting members 2202 stacked in sequence.

[0054] For example, reference Figure 3 and Figure 4 In (a), along the radial direction (such as Figure 1 The third connecting portion 23 is provided at one end 2101 of the single tooth 21 close to the yoke (not shown in the figure), and the second connecting member 2202 includes an opening in a semicircular shape. The third connecting portion 23 includes a process groove with a semicircular cross section formed by stacking semicircular openings. The process groove is axially (as shown in the figure). Figure 3 The third connecting portion 23 is provided at one end 2102 of the single tooth 21 away from the yoke 10, and the second connecting member 2202 is provided at one end 2102 of the single tooth 21 away from the yoke 10, and the second connecting member 2202 is provided at an opening in a square shape, and the third connecting portion 23 is provided at a process groove in a square cross section.

[0055] For example, continue to refer to Figure 3 Combined with Figure 7 , along the axial direction (such as Figure 3 The length H of the process groove is 4 mm to 8 mm. The present application does not impose any specific restrictions on this, and it can be adjusted according to actual conditions. For example, the length H of the process groove can also be 5 mm, 6.5 mm, 7 mm, etc. Therefore, it is convenient for the tooth portion 20 of the embodiment of the present application to be installed on the winding tool 40, which is beneficial to improve the assembly efficiency of the stator core 1.

[0056] The specific structure of the winding tool 40 and the assembly process of the stator core 1 of the embodiment of the present application are described in detail below with reference to the accompanying drawings.

[0057] In some possible implementations, reference Figures 7 and 8 The winding tool 40 includes a plurality of fourth connecting parts 41 and a base 42 .

[0058] Specifically, Figure 8 As shown in FIG. , a plurality of fourth connecting portions 41 are arranged along the circumferential direction (eg Figure 8 The outer edge of the base 42 is spaced apart from each other (as shown in the R direction). Figure 7 As shown in FIG. 1 , the third connecting portion 23 is configured to be able to move in the axial direction (eg Figure 7 The tooth portion 20 is connected to the winding tool 40 in a detachable manner.

[0059] In other words, the fourth connection portion 41 is adapted to the shape of the third connection portion 23, and the plurality of fourth connection portions 41 clamp the third connection portion 23 of the single tooth 21 in the radial direction, so that the tooth portion 20 can be detachably mounted on the winding tool 40 through the third connection portion 23. Figure 8 The fourth connecting portion 41 includes a Figure 8 The process column is accommodated in the process groove (ie, the third connecting portion 23) so that the tooth portion 20 and the winding tool 40 can be detachably connected.

[0060] For example, Figure 8 As shown, the base 42 is a circular base having a radial direction (such as Figure 8 A connecting column extending in the X direction (as shown in the middle), one end of the connecting column is connected to the base 42, and the other end is connected to the process column (i.e., the fourth connecting portion 41), and multiple process columns are arranged at intervals along the circumference of the base 42 and correspond one by one to the third connecting portions 23 of the multiple tooth portions 20 to form the winding tooling 40 of the embodiment of the present application.

[0061] It should be noted that the embodiment of the present application does not impose any specific restrictions on the structure of the winding tool 40, as long as the winding tool 40 can be used to be detachably connected to the tooth portion 20 of the stator core 1 of the embodiment of the present application.

[0062] In addition, reference Figures 1 to 7 The assembly process of the stator core 1 of the embodiment of the present application includes:

[0063] First, if Figure 7 As shown in , the plurality of single teeth 21 of the tooth portion 20 are mounted one by one on the plurality of fourth connecting portions 41 of the winding tool 40 to fix the tooth portion 20 to the winding tool 40 to form an initial assembly state;

[0064] Next, a continuous wave winding process is adopted to insert a winding copper wire (not shown in the figure) from the outside of the stator core 1 (i.e. the tooth portion 20 in the initial assembly state) and perform continuous wave winding;

[0065] Finally, if Figure 1 As shown in FIG. 1 , the tooth portion 20 after the continuous wave winding is taken off from the winding tool 40, and then connected in the axial direction (such as Figure 1 The tooth portion 20 having the winding copper wire is installed on the yoke portion 10 (as shown in the Z direction).

[0066] It should be noted that the stator core 1 of the embodiment of the present application meets the assembly requirements of the continuous wave winding copper wire, but is not limited to this. The stator core of the present application can also be adapted to other winding copper wire assembly processes, such as Hair-pin / I-pin winding. In addition, the tooth portion 20 and the yoke portion 10 are easy to manufacture, easy to process and carry. In addition, during the assembly process of the stator core 1, the winding copper wire is inserted from the outside of the stator core 1, which improves the generation efficiency of the copper wire insertion manufacturing process.

[0067] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A stator core, characterized in that: include: A yoke portion extending in a circumferential direction and having a plurality of first connection portions, wherein the plurality of first connection portions are arranged at intervals on an inner side of the yoke portion along the circumferential direction; The tooth portion comprises a plurality of single teeth, wherein the plurality of single teeth are arranged at intervals along the circumferential direction and correspond one-to-one to the plurality of first connecting portions, wherein any two adjacent single teeth are not connected; wherein, Each of the single teeth has a second connecting portion, and along the radial direction, the second connecting portion is arranged at one end of the single tooth close to the yoke portion, and the second connecting portion is configured to be able to be connected to the first connecting portion along the axial direction so that the tooth portion and the yoke portion can be detachably connected, and the first connecting portion is configured to be able to limit the radial movement of the second connecting portion, the circumference surrounds the axial direction, and the radial direction is perpendicular to the axial direction.

2. The stator core according to claim 1, characterized in that: The first connecting part includes a groove, and the second connecting part includes a convex part adapted to the groove, the groove extends along the axial direction, the convex part extends along the axial direction, and the convex part is configured to be able to be accommodated in the groove from one axial side of the groove so that the single tooth is connected to the yoke.

3. The stator core according to claim 2, characterized in that: The groove includes a limiting portion, and along the circumferential direction, the limiting portion is protrudingly provided on the inner walls of both sides of the groove; The convex portion includes a positioning groove, and the positioning groove is arranged on the outer walls of both sides of the convex portion along the circumferential direction. The limiting portion is used to be accommodated in the positioning groove along the axial direction to limit the movement of the single tooth relative to the yoke along the radial direction.

4. The stator core according to claim 1, characterized in that: Each of the single teeth further includes a third connecting portion, which is disposed at one end of the single tooth close to the yoke portion, extends along the axial direction, and is configured to be connected to a winding tool.

5. The stator core according to claim 4, characterized in that: Each of the single teeth further includes a first punching portion and a second punching portion, wherein the second punching portion is disposed on opposite sides of the first punching portion along the axial direction, and the third connecting portion is disposed on the second punching portion; wherein, The first punching sheet portion includes a plurality of first single-tooth punching sheets, each of which is provided with a first connecting piece at one end close to the yoke along the radial direction, and the second punching sheet portion includes a plurality of second single-tooth punching sheets, each of which is provided with a first connecting piece at one end close to the yoke along the radial direction, and each of which has a second connecting piece; The plurality of first single-tooth punching sheets and the plurality of second single-tooth punching sheets are respectively stacked along the axial direction, so that the plurality of first connecting members are stacked along the axial direction to form the second connecting portion, and the plurality of second connecting members are stacked along the axial direction to form the third connecting portion.

6. The stator core according to claim 5, characterized in that: Along the radial direction, the third connecting portion is arranged at one end of the single tooth close to the yoke, the second connecting member includes an opening, and the third connecting portion includes a process groove formed by stacking a plurality of openings along the axial direction.

7. The stator core according to claim 6, characterized in that: Along the axial direction, the length of the process groove is comprised between 4 mm and 8 mm.

8. The stator core according to claim 1, characterized in that: It also includes a shell extending along the circumferential direction, and the yoke is sleeved in the shell.

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