Stator assembly, motor and oral care equipment

Abstract

The embodiment of the utility model discloses a stator assembly, a motor and oral care equipment. The stator assembly includes a stator housing and a stator. A mounting cavity and an assembling opening communicated with the mounting cavity are defined by the stator shell, and the stator is mounted in the mounting cavity. One of the stator shell and the stator is provided with a positioning groove, the other one of the stator shell and the stator is provided with a positioning part, the positioning groove is communicated with the mounting cavity and extends in the axial direction of the stator assembly from the assembling opening, and at least part of the positioning part is located in the positioning groove so that the stator and the stator shell can be relatively fixed. According to the technical scheme, the assembling efficiency of the stator assembly can be improved, and meanwhile the overall cost is reduced.

Description

Technical Field

[0001] This application relates to the field of oral care technology, and more specifically, to a stator assembly, a motor, and an oral care device. Background Technology

[0002] Currently, oral care devices, such as toothbrushes, mostly use servo motors as drive components, which allow oral care devices to have a larger cleaning angle.

[0003] The stator of an electric motor includes a stator housing and a stator core installed inside the stator housing. In related technologies, tooling is typically used for positioning during the assembly of the stator core and stator housing to fix their relative positions. However, tooling-based assembly is complex, leading to reduced production efficiency and increased costs. Utility Model Content

[0004] This application provides a stator assembly, a motor, and an oral care device, aiming to improve production efficiency and reduce costs.

[0005] In a first aspect, embodiments of this application provide a stator assembly, including:

[0006] The stator housing defines a mounting cavity and an assembly port communicating with the mounting cavity; and

[0007] The stator is installed within the mounting cavity;

[0008] The stator housing and the stator are provided with a positioning groove and a positioning part, respectively. The positioning groove communicates with the mounting cavity and extends from the assembly port along the axial direction of the stator assembly. At least part of the positioning part is located in the positioning groove so that the stator and the stator housing are fixed relative to each other.

[0009] In this embodiment, one of the stator housing and the stator is provided with a positioning groove, and the other with a positioning part. The positioning groove extends axially from the assembly opening along the stator assembly, and at least a portion of the positioning part is located within the positioning groove, thereby fixing the stator and the stator housing relatively. In this embodiment, the alignment and engagement of the positioning part and the positioning groove can be completed during the assembly process of the stator and the stator housing, thus achieving the positioning operation of the stator relative to the stator housing, eliminating the need for a separate alignment operation of the stator assembly. Compared to the tooling positioning method used in related technologies, the assembly and positioning of the stator and the stator housing in this application are completed in one step, reducing work steps and work difficulty, thereby improving assembly efficiency and reducing labor costs. Furthermore, the positioning of the stator and the stator housing in this application does not require additional positioning tooling, thus reducing the material cost of positioning tooling fixtures. In other words, the stator assembly in this application can improve the assembly efficiency of the stator assembly while reducing the overall cost.

[0010] Optionally, the positioning groove is disposed on the stator housing, the positioning part is disposed on the stator, and the positioning groove is disposed radially through the stator assembly to connect the mounting cavity and the outside.

[0011] Based on the above embodiments, the positioning groove utilizes the wall thickness of the stator housing, thereby reducing the space occupied by the mounting cavity. This allows the positioning part to be positioned on the stator housing, resulting in a more compact and seamless fit between the stator and the stator housing. It is understood that the stator housing directly forms the sidewall of the positioning groove, and the portion of the stator housing forming the positioning groove as a whole restricts the movement of the positioning part, improving the relative stability between the positioning part and the positioning groove.

[0012] Optionally, along the radial direction of the stator assembly, the outer surface of the positioning portion is flush with the outer surface of the stator housing, or the outer surface of the positioning portion is closer to the center of the stator assembly than the outer surface of the stator housing.

[0013] Based on the above embodiments, by limiting the relationship between the outer surface of the positioning part and the outer surface of the stator housing in the radial direction of the stator assembly, it is ensured that the positioning part does not protrude from the outer surface of the stator housing, thereby avoiding interference during stator assembly assembly, reducing assembly difficulty, and improving the overall production efficiency of oral care equipment.

[0014] Optionally, along the axial direction of the stator assembly, the stator housing has a first length L1, and the positioning groove has a second length L2, satisfying the relationship: L2≤L1 / 2.

[0015] Based on the above embodiments, by limiting the length of the positioning groove in the axial direction of the stator assembly, the structural strength of the stator housing is ensured and the overall structural reliability of the stator assembly is improved.

[0016] Optionally, along the axial direction of the stator assembly, the positioning groove has a second length L2, and the positioning part has a third length L3, satisfying the relationship: L3 < L2.

[0017] Based on the above embodiments, it is ensured that the length of the positioning groove is greater than the length of the positioning part in the axial direction of the stator assembly, thereby ensuring that the positioning part is completely located in the positioning groove, so as to ensure the reliability of the fit between the positioning part and the positioning groove.

[0018] Optionally, the groove of the positioning groove is located at the end of the stator housing where the assembly port is located, and the positioning part is spaced apart from the groove of the positioning groove.

[0019] Based on the above embodiments, a certain distance is maintained between the positioning part and the opening of the positioning groove, making it difficult for the positioning part to detach from the positioning groove. Moreover, the spacing between the positioning part and the opening of the positioning groove indicates that the positioning part will still move a certain distance along the positioning groove after it enters the positioning groove, providing guidance for the assembly of the stator to the stator housing, preventing the stator from getting stuck, and improving the smoothness of assembly.

[0020] Optionally, the positioning groove has a guide section that communicates with the groove opening, and the guide section is flared in the direction close to the groove opening.

[0021] Based on the above embodiments, by setting a guide section, the difficulty of aligning the positioning part and the positioning groove during assembly can be reduced, the assembly process of the stator and the stator housing can be accelerated, and production efficiency can be improved.

[0022] Optionally, at least one sidewall of the guide section is inclined relative to the axial direction of the stator assembly to form a guide ramp.

[0023] Based on the above embodiments, this makes it easier to assemble the stator and stator housing, thereby further improving production efficiency.

[0024] Optionally, at least one sidewall of the guide segment is arc-shaped.

[0025] Based on the above embodiments, it is possible to avoid the positioning part getting stuck and also to improve assembly efficiency.

[0026] Optionally, the positioning part abuts against the bottom wall of the positioning groove along the axial direction of the stator assembly away from the assembly port.

[0027] Based on the above embodiments, by having the bottom wall of the positioning groove abut against the positioning part, the movement of the positioning part relative to the bottom wall of the positioning groove along the axial direction of the stator assembly is restricted, thereby achieving axial positioning of the stator relative to the stator housing.

[0028] Optionally, the positioning groove is provided with a positioning step spaced apart from the assembly port, and the positioning part abuts against the positioning step.

[0029] Based on the above embodiments, by abutting the positioning step against the positioning part, the movement of the positioning part relative to the positioning step along the axial direction of the stator assembly is restricted, thereby achieving axial positioning of the stator relative to the stator housing.

[0030] Optionally, the positioning part is interference-fitted with the positioning groove.

[0031] Based on the above embodiments, the cooperation between the positioning part and the positioning groove can not only achieve relative fixation of the positioning part relative to the stator assembly in its circumferential direction, but also achieve relative fixation of the positioning part relative to the stator assembly in its axial direction, thereby further improving the stability of the positioning part in the positioning groove and improving the stability of the stator relative to the stator housing.

[0032] Optionally, the stator defines a rotational space for mounting the rotor, and the positioning part protrudes from the outer peripheral surface of the stator.

[0033] Based on the above embodiments, the coordination between the stator assembly and the rotor in the embodiments of this application is avoided.

[0034] Optionally, the stator includes:

[0035] A bracket is installed within the mounting cavity, and the end of the bracket near the assembly opening has a first protrusion; and

[0036] A stator core is connected to the bracket, and a second protrusion is provided on the outer circumferential surface of the stator core;

[0037] The first protrusion and the second protrusion are stacked, and the positioning part includes the first protrusion and the second protrusion.

[0038] Based on the above embodiments, the positioning part is formed by the bracket and the stator core. When the positioning part is positioned and engaged with the positioning groove, the stator shell can be aligned with the bracket and the stator core, and the assembly accuracy of the stator relative to the stator shell can be achieved.

[0039] Optionally, the positioning groove is disposed in the stator housing, and the stator assembly further includes:

[0040] An end cap is provided to connect the stator housing and to seal the assembly port. The outer peripheral surface of the end cap has a protrusion located in the positioning groove.

[0041] Based on the above embodiments, the cooperation between the protrusion and the positioning groove can fix the position of the end cover relative to the stator housing during assembly, which is beneficial to improving the overall stability of the stator assembly.

[0042] Optionally, in the axial direction of the stator assembly, the protrusion is spaced apart from the positioning portion and defines a heat dissipation hole that connects the mounting cavity to the outside.

[0043] Based on the above embodiments, the heat generated during motor operation can be partially dissipated to the outside through the heat dissipation holes, effectively improving the heat dissipation efficiency of the motor, which is more conducive to ensuring the normal operation of the motor, and also helps to improve the upper limit of motor operation performance, thereby improving the performance and reliability of oral care equipment.

[0044] Secondly, embodiments of this application provide an electric motor, comprising:

[0045] Stator assembly as described in any of the preceding items; and

[0046] The rotor is rotatably configured relative to the stator assembly.

[0047] By using the stator assembly provided in the embodiments of this application, the assembly efficiency of the motor can be improved and the cost reduced.

[0048] Thirdly, embodiments of this application provide an oral care device, comprising:

[0049] The handle includes a motor and a shaft as described above, the shaft being connected to the rotor; and

[0050] The nursing component is connected to the rotating shaft.

[0051] By using the motor provided in the embodiments of this application, the assembly efficiency of oral care equipment can be improved and the cost reduced. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of the structure of a motor in one embodiment of this application;

[0054] Figure 2 This is a schematic diagram of the exploded structure of a motor in one embodiment of this application;

[0055] Figure 3 This is a schematic cross-sectional view of the motor in one embodiment of this application;

[0056] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0057] Figure 5 This is a structural schematic diagram of the motor from another perspective in one embodiment of this application.

[0058] Figure 6 This is a schematic diagram of the stator housing in one embodiment of this application;

[0059] Figure 7 This is a schematic diagram of the stator housing from another perspective in one embodiment of this application;

[0060] Figure 8 for Figure 7 Enlarged structural diagram at point C;

[0061] Figure 9 for Figure 5 A magnified structural diagram at point B in the middle.

[0062] Figure label:

[0063] 1000, Motor; 100, Stator assembly; 10, Stator housing; 11, Mounting cavity; 12, Assembly port; 13, Positioning groove; 131, Guide section; 132, Positioning section; 133, Heat dissipation hole; 14, Heat dissipation gap; 30, Stator; 31, Positioning part; 32, Bracket; 321, First protrusion; 33, Stator core; 331, Second protrusion; 50, End cover; 51, Protrusion; 200, Rotor. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0065] One embodiment of this application provides an oral care device, which may be an electric toothbrush, etc., including a handle and a care component. The handle includes a motor and a rotating shaft. The motor includes a stator assembly and a rotor. The stator assembly drives the rotor to rotate relative to the stator assembly. The rotating shaft is connected to the rotor to rotate with the rotor. The care component is connected to the rotating shaft and may be a brush head to clean the oral cavity by rotating with the rotating shaft.

[0066] Currently, most oral care devices use servo motors as drive components, allowing for a wider cleaning angle. In related technologies, the motor includes a stator housing and a stator core installed within it. During the assembly of the stator core and housing, tooling is typically used for positioning, fixing the relative positions of the stator core and housing. However, this tooling-based assembly method is complex, leading to reduced production efficiency and increased costs.

[0067] To address the above problems, another aspect of this application provides a stator assembly 100. In conjunction with... Figures 1 to 3 The stator assembly 100 includes a stator housing 10 and a stator 30.

[0068] The stator housing 10 defines a mounting cavity 11 and an assembly port 12 communicating with the mounting cavity 11. During assembly, the stator 30 is inserted into the mounting cavity 11 through the assembly port 12. In this embodiment, one of the stator housing 10 and the stator 30 is provided with a positioning groove 13, and the other is provided with a positioning part 31. The positioning groove 13 communicates with the mounting cavity 11 and extends axially from the assembly port 12 along the stator assembly 100. At least a portion of the positioning part 31 is located within the positioning groove 13, so that the stator 30 is fixed relative to the stator housing 10.

[0069] like Figure 2In the illustrated embodiment, the stator housing 10 is generally cylindrical to enclose and form a mounting cavity 11 located inside the stator housing 10. The mounting port 12 is located at one end of the stator housing 10, for example, at the tail end. The distinction between the head and tail ends of the stator housing 10 can be based on the fact that one end of the stator housing 10 has a communicating hole for the shaft to extend out; this end is considered the head end, and the mounting port 12 is located at the other end, referred to as the tail end.

[0070] In this embodiment, a positioning groove 13 is provided on the stator housing 10, and the aforementioned positioning portion 31 is formed on the stator 30. The axial direction of the stator assembly 100 is the direction indicated by the rotation axis of the rotor 200. The positioning groove 13 starts at the assembly opening 12 and extends along the axial direction of the stator assembly 100 towards the end away from the assembly opening 12. The positioning groove 13 has an opening at the assembly opening 12 to communicate with the outside, such as... Figure 2 As shown, when viewing the stator housing 10 from the rear end, the opening of the positioning groove 13 can be observed. Optionally, the opening of the positioning groove 13 is formed on the housing portion that encloses the assembly opening 12. Exemplarily, the positioning part 31 is disposed on the outer periphery of the stator 30. During assembly, the stator 30 as a whole enters the mounting cavity 11 from the assembly opening 12. As the stator 30 moves relative to the stator housing 10, the positioning part 31 enters the positioning groove 13 from the opening of the positioning groove 13. Optionally, the positioning part 31 can be a protruding structure protruding outward from the stator 30, such as a protrusion or a ridge.

[0071] When the stator 30 is located within the mounting cavity 11, the positioning part 31 is located within the positioning groove 13. Understandably, the positioning groove 13 is positioned at a fixed location on the stator housing 10, and the positioning part 31 is also fixed relative to the overall position of the stator 30. Therefore, when the positioning part 31 is located within the positioning groove 13, the position of the stator 30 within the stator housing 10 is guaranteed to be fixed, thus ensuring that the rotor 200's initial position is at a preset position when the motor 1000 is energized. Furthermore, the groove wall of the positioning groove 13 restricts the displacement of the positioning part 31 along the circumferential direction of the stator assembly 100, thereby fixing the stator 30 relative to the stator housing 10. Therefore, the oral care device of this embodiment is less prone to circumferential displacement of the stator 30 due to assembly errors, which in turn causes circumferential displacement of the rotor 200 when energized, further leading to inaccurate orientation of care components such as the brush head.

[0072] Of course, in some embodiments, the positioning groove 13 can also be provided on the stator 30, and the stator housing 10 can be provided with the positioning part 31. The cooperation between the positioning groove 13 and the positioning part 31 can also achieve the above-mentioned effect, which will not be elaborated here.

[0073] It should be noted that, since the positioning groove 13 in this embodiment extends along the axial direction of the stator assembly 100, the movement direction of the stator 30 relative to the stator housing 10 during assembly is also approximately along the axial direction of the stator assembly 100. Therefore, the alignment and engagement of the positioning part 31 and the positioning groove 13 can be completed during the assembly process of the stator 30 and the stator housing 10, thereby realizing the positioning operation of the stator 30 relative to the stator housing 10, without the need for separate alignment of the stator assembly 100. Compared with the tooling positioning method used in related technologies, the assembly and positioning of the stator 30 and the stator housing 10 in this application are completed in one step, reducing work steps and work difficulty, thereby improving assembly efficiency and reducing labor costs. In addition, the positioning of the stator 30 and the stator housing 10 in this application does not require additional positioning tooling, thus reducing the material cost of positioning tooling fixtures. In other words, the stator assembly 100 in this application can improve the assembly efficiency of the stator assembly 100 while reducing the overall cost.

[0074] The following explanation will continue with the example of positioning groove 13 located on stator housing 10 and positioning part 31 located on stator 30.

[0075] Combination Figures 3 to 5 In some embodiments, the positioning groove 13 is radially through the stator assembly 100 to connect the mounting cavity 11 and the outside. Specifically, in a cylindrical structure of the stator housing 10, the wall thickness direction of the sidewall of the stator housing 10 is the same as the radial direction of the stator assembly 100. The positioning groove 13 penetrates the sidewall of the stator housing 10 radially, allowing the outside to communicate with the mounting cavity 11 through the positioning groove 13. In these embodiments, the positioning groove 13 utilizes the wall thickness of the stator housing 10, thereby reducing the space occupied by the mounting cavity 11, allowing the positioning part 31 to be disposed on the stator housing 10, and enabling a more compact and tight fit between the stator 30 and the stator housing 10. It can be understood that the stator housing 10 is directly constructed as the sidewall of the positioning groove 13, and the part of the stator housing 10 forming the positioning groove 13 as a whole plays a role in restricting the movement of the positioning part 31, thereby improving the relative stability between the positioning part 31 and the positioning groove 13.

[0076] Optionally, along the axial direction of the stator assembly 100, the stator housing 10 has a first length L1, and the positioning groove 13 has a second length L2, satisfying the relationship: L2 ≤ L1 / 2. That is, the length of the positioning groove 13 along the axial direction of the stator assembly 100 does not exceed half the length of the stator housing 10 along the axial direction of the stator assembly 100. The longer the positioning groove 13, the larger the opening in the outer wall of the stator housing 10, and the more likely the structural strength of the stator housing 10 will be affected. This embodiment ensures the structural strength of the stator housing 10 and improves the overall structural reliability of the stator assembly 100 by limiting the length of the positioning groove 13 along the axial direction of the stator assembly 100.

[0077] Combination Figures 6 to 8 In some embodiments, the positioning groove 13 has a guide section 131 communicating with the groove opening and a positioning section 132 communicating with the guide section 131. The guide section 131 is used to guide the positioning part 31 into the positioning section 132, and the guide section 131 is flared in the direction close to the groove opening. Understandably, the end of the guide section 131 near the groove opening has a larger opening, so that the positioning part 31 can be placed in the guide section 131 relatively easily and enter the positioning section 132 under the guidance of the guide section 131, realizing the positioning and engagement of the stator 30 and the stator housing 10. Thus, by setting the guide section 131, the present application embodiment can reduce the difficulty of aligning the positioning part 31 with the positioning groove 13 during assembly, speed up the assembly process of the stator 30 and the stator housing 10, and improve production efficiency.

[0078] For example, in one structural form, at least one side wall of the guide section 131 is inclined relative to the axial direction of the stator assembly 100 to form a guide ramp. For instance, both opposite side walls of the guide section 131 are inclined relative to the axial direction of the stator assembly 100, forming two opposing guide ramps, making the guide section 131 approximately trumpet-shaped, a simple and effective construction. The trumpet-shaped guide section 131 is compatible with the assembly method where the positioning groove 13 enters the guide section 131 from both sides of the stator housing 10 circumferentially, facilitating the assembly of the stator 30 and the stator housing 10 and further improving production efficiency. Alternatively, one side wall of the guide section 131 can be inclined relative to the axial direction of the stator assembly 100, increasing the opening of the positioning groove 13 near the groove opening for easier positioning.

[0079] Alternatively, in another structural form, at least one side wall of the guide section 131 is arc-shaped, which can guide the positioning part 31 to transition more smoothly from the guide section 131 to the positioning section 132, avoid the positioning part 31 getting stuck, and also improve assembly efficiency.

[0080] For the positioning unit 31, please refer to Figure 3 and Figure 4 In some embodiments, the stator 30 defines a rotational space for mounting the rotor 200, and the positioning part 31 protrudes from the outer peripheral surface of the stator 30 to avoid affecting the fit between the stator 30 and the rotor 200.

[0081] Specifically, the stator 30 includes a bracket 32 ​​and a stator core 33. The bracket 32 ​​is installed in the mounting cavity 11, and the stator core 33 is connected to the bracket 32. A first protrusion 321 is provided at one end of the bracket 32 ​​near the assembly port 12, and a second protrusion 331 is provided on the outer circumferential surface of the stator core 33. The first protrusion 321 and the second protrusion 331 are stacked. In this embodiment, the positioning part 31 includes a first protrusion 321 and a second protrusion 331. The first protrusion 321 and the second protrusion 331 can be tightly attached to form the positioning part 31 by connecting the stator core 33 and the bracket 32, or the first protrusion 321 and the second protrusion 331 can be further reinforced by adhesive or other methods. The positioning part 31 is formed by the bracket 32 ​​and the stator core 33. When the positioning part 31 is positioned and engaged with the positioning groove 13, the stator housing 10 can be aligned with the bracket 32 ​​and the stator core 33, thus achieving greater accuracy in the assembly of the stator 30 relative to the stator housing 10.

[0082] In addition, the first protrusion 321 and the second protrusion 331 are both close to the assembly port 12. On the one hand, the first protrusion 321 can avoid affecting the assembly of the bracket 32 ​​and the stator core 33, and the bracket 32 ​​and the stator housing 10. On the other hand, it is also convenient to adjust the position of the stator 30 relative to the stator housing 10 during the assembly process, so that the positioning part 31 can cooperate with the positioning groove 13, which is convenient for observation and also convenient for disassembly, reducing the deformation of the stator 30 and the stator housing 10.

[0083] Combination Figure 9 In one embodiment, along the axial direction of the stator assembly 100, the positioning groove 13 has a second length L2, and the positioning part 31 has a third length L3, satisfying the relationship: L3 < L2. That is, this embodiment ensures that the length of the positioning groove 13 is greater than the length of the positioning part 31 along the axial direction of the stator assembly 100, thereby ensuring that the positioning part 31 is completely located within the positioning groove 13, so as to ensure the reliability of the fit between the positioning part 31 and the positioning groove 13.

[0084] Optionally, the opening of the positioning groove 13 is located at the end of the stator housing 10 where the assembly opening 12 is provided. After assembly, the positioning part 31 and the opening of the positioning groove 13 are spaced apart to ensure a certain distance between them, making it difficult for the positioning part 31 to come out of the positioning groove 13. Furthermore, the spaced arrangement between the positioning part 31 and the opening of the positioning groove 13 indicates that the positioning part 31 will continue to move a certain distance along the positioning groove 13 after entering it, providing guidance for the assembly of the stator 30 to the stator housing 10, preventing the stator 30 from getting stuck, and improving assembly smoothness. In addition, the spaced arrangement of the positioning part 31 and the opening of the positioning groove 13 also provides installation space for other structures, facilitating subsequent assembly.

[0085] After assembly, the positioning groove 13, located on opposite side walls of the stator housing 10 in the circumferential direction, restricts the displacement of the positioning part 31 in the circumferential direction of the stator assembly 100, thereby fixing the relative position of the positioning part 31 to the stator housing 10 in the circumferential direction. To further improve the stability of the positioning part 31 and the positioning groove 13, in one embodiment, the positioning part 31 and the positioning groove 13 are interference-fitted. The positioning groove 13 clamps the positioning part 31 on opposite side walls of the stator housing 10 in the circumferential direction, thereby restricting the movement of the positioning part 31 along the positioning groove 13 in the axial direction of the stator assembly 100 through the frictional force between the side walls of the positioning groove 13 and the positioning part 31. Thus, the cooperation between the positioning part 31 and the positioning groove 13 not only achieves relative fixation of the positioning part 31 relative to the stator assembly 100 in the circumferential direction, but also achieves relative fixation of the positioning part 31 relative to the stator assembly 100 in the axial direction, thereby further improving the stability of the positioning part 31 within the positioning groove 13 and improving the stability of the stator 30 relative to the stator housing 10.

[0086] Furthermore, in one embodiment, after assembly, the positioning part 31 abuts against the bottom wall of the positioning groove 13 along the axial direction of the stator assembly 100 away from the assembly opening 12. By the bottom wall of the positioning groove 13 abutting against the side of the positioning part 31 protruding from other parts of the stator 30, the movement of the positioning part 31 relative to the bottom wall of the positioning groove 13 along the axial direction of the stator assembly 100 is restricted, thereby achieving axial positioning of the stator 30 relative to the stator housing 10.

[0087] Alternatively, in another embodiment, the positioning groove 13 is provided with a positioning step spaced apart from the assembly opening 12, and the positioning part 31 abuts against the positioning step. For example, a partition is provided on the inner wall of the stator housing 10 or the positioning groove 13, and the portion of the partition located in the positioning groove 13 forms the positioning step. Similarly, by the positioning step abutting against the positioning part 31, the movement of the positioning part 31 relative to the positioning step along the axial direction of the stator assembly 100 is restricted, thereby achieving axial positioning of the stator 30 relative to the stator housing 10.

[0088] In a specific example, by clamping the positioning part 31 with the positioning groove 13 and making the positioning part 31 abut against the bottom wall or positioning step of the positioning groove 13, the positioning part 31 can be positioned relative to the stator housing 10 in the circumferential and axial directions of the stator assembly 100, thereby realizing the circumferential and axial positioning of the stator 30 relative to the stator housing 10, improving the positional stability of the stator 30 within the stator housing 10, and further improving the positioning accuracy.

[0089] It should be noted that, along the radial direction of the stator assembly 100, the outer surface of the positioning portion 31 is flush with the outer surface of the stator housing 10, or the outer surface of the positioning portion 31 is closer to the center of the stator assembly 100 than the outer surface of the stator housing 10. In other words, the positioning portion 31 does not protrude from the outer surface of the stator housing 10. Understandably, any portion of the positioning portion 31 protruding from the stator housing 10 could easily affect the assembly of the stator assembly 100 within the handle. Therefore, by defining the relationship between the outer surface of the positioning portion 31 and the outer surface of the stator housing 10 in the radial direction of the stator assembly 100, the positioning portion 31 is ensured not to protrude from the outer surface of the stator housing 10, thus avoiding interference during the assembly of the stator assembly 100, reducing assembly difficulty, and improving the overall production efficiency of the oral care equipment.

[0090] Please refer to the reference. Figure 2 , Figure 5 and Figure 9 In some embodiments, the stator assembly 100 further includes an end cap 50, which connects to the stator housing 10 and seals the assembly opening 12 to improve the overall strength of the stator assembly 100 and protect its internal components. Optionally, the outer peripheral surface of the end cap 50 has a protrusion 51 located within a positioning groove 13. Thus, the engagement of the protrusion 51 with the positioning groove 13 fixes the position of the end cap 50 relative to the stator housing 10 during assembly. For some end cap 50 configurations, this facilitates alignment of the end cap 50 with the wire harness, simplifying the wire threading process. Furthermore, the protrusion 51 can also be interference-fitted with the positioning groove 13 to position the end cap 50 relative to the stator housing 10 in both the circumferential and axial directions of the stator assembly 100, thereby improving the overall stability of the stator assembly 100.

[0091] like Figure 4 As shown, optionally, in the axial direction of the stator assembly 100, the protrusion 51 and the positioning part 31 are spaced apart and define a heat dissipation hole 133 that connects the mounting cavity 11 to the outside. It can be seen that there is still a certain gap between the end cover 50 and the support 32 of the stator 30, forming a heat dissipation gap 14. The heat dissipation hole 133 can connect the heat dissipation gap 14 to the outside, so that the heat generated during the operation of the motor 1000 can be partially dissipated to the outside through the heat dissipation gap 14 and the heat dissipation hole 133, effectively improving the heat dissipation efficiency of the motor 1000, which is more conducive to ensuring the normal operation of the motor 1000, and also helps to improve the upper limit of the performance of the motor 1000, thereby improving the usability and reliability of the oral care equipment.

[0092] In some embodiments, the positioning groove 13 proposed in this application may not penetrate the stator housing 10, but may be disposed within the stator housing 10, which will not be elaborated here. It is understood that for some metal stator housings 10, the through-hole positioning groove 13 can be formed on the stator housing 10 by milling or cutting, which is simpler and more convenient to process and can improve production efficiency.

[0093] Furthermore, in some optional structural forms, the inner wall of the stator housing 10 can be provided with a protrusion or a raised strip, and the stator core 33 and the bracket 32 ​​can form a positioning groove 13. Thus, during the assembly of the stator assembly 100, the positioning operation of the stator 30 relative to the stator housing 10 can be realized through the positioning cooperation between the positioning part 31 and the positioning groove 13.

[0094] The above is an explanation of the specific structure of the stator assembly 100 proposed in the embodiments of this application. It can be understood that the motor 1000 and oral care device proposed in the embodiments of this application have all the effects mentioned above because they adopt the stator assembly 100 proposed in the embodiments of this application. Further details are omitted here.

[0095] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stator assembly characterized by, The stator assembly comprises: a stator housing defining a mounting cavity and an assembly opening in communication with the mounting cavity; and a stator mounted in the mounting cavity; wherein one of the stator housing and the stator is provided with a positioning groove, and the other is provided with a positioning portion, the positioning groove is in communication with the mounting cavity and extends along an axial direction of the stator assembly from the assembly opening, and at least a portion of the positioning portion is located in the positioning groove to relatively fix the stator and the stator housing. The positioning groove is provided in the stator housing, and the positioning portion is provided in the stator, and the positioning groove is arranged through along a radial direction of the stator assembly to communicate the mounting cavity with the outside.

2. The stator assembly of claim 1, wherein, Along the radial direction of the stator assembly, an outer surface of the positioning portion is flush with an outer surface of the stator housing, or the outer surface of the positioning portion is closer to a center of the stator assembly than the outer surface of the stator housing.

3. The stator assembly of claim 2, wherein, Along the axial direction of the stator assembly, the stator housing has a first length L1, the positioning groove has a second length L2, and the following relationship is satisfied: L2≤L1 / 2.

4. The stator assembly of claim 1, wherein, Along the axial direction of the stator assembly, the positioning groove has a second length L2, and the positioning portion has a third length L3, and the following relationship is satisfied: L3<L2.

5. The stator assembly of claim 1, wherein, The slot opening of the positioning groove is arranged at one end of the stator housing provided with the assembly opening, and the positioning portion is arranged in a spaced manner with the slot opening of the positioning groove.

6. The stator assembly of claim 1, wherein, The positioning groove has a guide segment in communication with the slot opening, and the guide segment is arranged in a flared manner along a direction close to the slot opening.

7. The stator assembly of claim 1, wherein At least one side wall of the guide segment is arranged in an inclined manner relative to the axial direction of the stator assembly to form a guide slope; or 8. The stator assembly of claim 7, wherein, At least one side wall of the guide segment is arranged in an arc shape. The positioning portion abuts against a groove bottom wall of the positioning groove away from the assembly opening along the axial direction of the stator assembly; or 9. The stator assembly of claim 1, wherein, The positioning groove is provided with a positioning step arranged in a spaced manner with the assembly opening, and the positioning portion abuts against the positioning step. The positioning portion is in interference fit with the positioning groove.

10. The stator assembly of any one of claims 1 to 9, wherein, The stator defines a rotating space for arranging a rotor therein, and the positioning portion is protruded from an outer circumferential surface of the stator.

11. The stator assembly of any one of claims 1 to 9, wherein, The stator assembly comprises:

12. The stator assembly of claim 11, wherein, a stator housing defining a mounting cavity and an assembly opening in communication with the mounting cavity; and a stator mounted in the mounting cavity; wherein one of the stator housing and the stator is provided with a positioning groove, and the other is provided with a positioning portion, the positioning groove is in communication with the mounting cavity and extends along an axial direction of the stator assembly from the assembly opening, and at least a portion of the positioning portion is located in the positioning groove to relatively fix the stator and the stator housing. The positioning groove is provided in the stator housing, and the positioning portion is provided in the stator, and the positioning groove is arranged through along a radial direction of the stator assembly to communicate the mounting cavity with the outside.

13. The stator assembly of any one of claims 1 to 9, wherein, Along the radial direction of the stator assembly, an outer surface of the positioning portion is flush with an outer surface of the stator housing, or the outer surface of the positioning portion is closer to a center of the stator assembly than the outer surface of the stator housing. Along the axial direction of the stator assembly, the stator housing has a first length L1, the positioning groove has a second length L2, and the following relationship is satisfied: L2≤L1 / 2.

14. The stator assembly of claim 13, wherein, Along the axial direction of the stator assembly, the positioning groove has a second length L2, and the positioning portion has a third length L3, and the following relationship is satisfied: L3<L2.

15. An electric machine characterized by The slot opening of the positioning groove is arranged at one end of the stator housing provided with the assembly opening, and the positioning portion is arranged in a spaced manner with the slot opening of the positioning groove. The positioning groove has a guide segment in communication with the slot opening, and the guide segment is arranged in a flared manner along a direction close to the slot opening. At least one side wall of the guide segment is arranged in an inclined manner relative to the axial direction of the stator assembly to form a guide slope; or At least one side wall of the guide segment is arranged in an arc shape.

16. An oral treatment device, characterized by The positioning portion abuts against a groove bottom wall of the positioning groove away from the assembly opening along the axial direction of the stator assembly; or The positioning groove is provided with a positioning step arranged in a spaced manner with the assembly opening, and the positioning portion abuts against the positioning step. The positioning portion is in interference fit with the positioning groove. The stator defines a rotating space for arranging a rotor therein, and the positioning portion is protruded from an outer circumferential surface of the stator. The stator assembly comprises: a stator housing defining a mounting cavity and an assembly opening in communication with the mounting cavity; and a stator mounted in the mounting cavity; wherein one of the stator housing and the stator is provided with a positioning groove, and the other is provided with a positioning portion, the positioning groove is in communication with the mounting cavity and extends along an axial direction of the stator assembly from the assembly opening, and at least a portion of the positioning portion is located in the positioning groove to relatively fix the stator and the stator housing. The positioning groove is provided in the stator housing, and the positioning portion is provided in the stator, and the positioning groove is arranged through along a radial direction of the stator assembly to communicate the mounting cavity with the outside. Along the radial direction of the stator assembly, an outer surface of the positioning portion is flush with an outer surface of the stator housing, or the outer surface of the positioning portion is closer to a center of the stator assembly than the outer surface of the stator housing. Along the axial direction of the stator assembly, the stator housing has a first length L1, the positioning groove has a second length L2, and the following relationship is satisfied: L2≤L1 / 2. Along the axial direction of the stator assembly, the positioning groove has a second length L2, and the positioning portion has a third length L3, and the following relationship is satisfied: L3<L2. The slot opening of the positioning groove is arranged at one end of the stator housing provided with the assembly opening, and the positioning portion is arranged in a spaced manner with the slot opening of the positioning groove. The positioning groove has a guide segment in communication with the slot opening, and the guide segment is arranged in a flared manner along a direction close to the slot opening. At least one side wall of the guide segment is arranged in an inclined manner relative to the axial direction of the stator assembly to form a guide slope; or At least one side wall of the guide segment is arranged in an arc shape. The positioning portion abuts against a groove bottom wall of the positioning groove away from the assembly opening along the axial direction of the stator assembly; or The positioning groove is provided with a positioning step arranged in a spaced manner with the assembly opening, and the positioning portion abuts against the positioning step. The positioning portion is in interference fit with the positioning groove. The stator defines a rotating space for arranging a rotor therein, and the positioning portion is protruded from an outer circumferential surface of the stator. The stator assembly comprises: a stator housing defining a mounting cavity and an assembly opening in communication with the mounting cavity; and a stator mounted in the mounting cavity; wherein one of the stator housing and the stator is provided with a positioning groove, and the other is provided with a positioning portion, the positioning groove is in communication with the mounting cavity and extends along an axial direction of the stator assembly from the assembly opening, and at least a portion of the positioning portion is located in the positioning groove to relatively fix the stator and the stator housing. The positioning groove is provided in the stator housing, and the positioning portion is provided in the stator, and the positioning groove is arranged through along a radial direction of the stator assembly to communicate the mounting cavity with the outside. Along the radial direction of the stator assembly, an outer surface of the positioning portion is flush with an outer surface of the stator housing, or the outer surface of the positioning portion is closer to a center of the stator assembly than the outer surface of the stator housing. Along the axial direction of the stator assembly, the stator housing has a first length L1, the positioning groove has a second length L2, and the following relationship is satisfied: L2≤L1 / 2. Along the axial direction of the stator assembly, the positioning groove has a second length L2, and the positioning portion has a third length L3, and the following relationship is satisfied: L3<L2. The slot opening of the positioning groove is arranged at one end of the stator housing provided with the assembly opening, and the positioning portion is arranged in a spaced manner with the slot opening of the positioning groove. The positioning groove has a guide segment in communication with the slot opening, and the guide segment is arranged in a flared manner along a direction close to the slot opening. At least one side wall of the guide segment is arranged in an inclined manner relative to the axial direction of the stator assembly to form a guide slope; or At least one side wall

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