Stator glue filling device

Abstract

A stator glue-filling device includes: a mandrel for inserting into the inner hole of the stator to seal the inner hole; the mandrel includes a first shaft segment and a second shaft segment, the diameter of the second shaft segment being larger than the diameter of the first shaft segment; the first shaft segment and the second shaft segment are connected by a tapered ramp section; the first shaft segment includes a large-diameter segment and a small-diameter segment, the diameter of the large-diameter segment being adapted to the diameter of the inner hole to position the mandrel; the small-diameter segment corresponds to the end wall of the inner hole, the diameter of the small-diameter segment being smaller than the diameter of the large-diameter segment, so as to form a deformation space between the small-diameter segment and the hole wall of the inner hole for the mandrel to expand and contract thermally. During glue filling, the mandrel expands due to heat, and the diameter of the small-diameter segment increases. After the glue material cools and forms, the mandrel can cool and shrink back, and the restored diameter of the small-diameter segment can form a gap on the outer periphery of the small-diameter segment, which facilitates the smooth removal of the mandrel from the stator and improves the product qualification rate.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a stator potting device. Background Technology

[0002] During the manufacturing process of electric motors, it is sometimes necessary to apply adhesive to the motor stator to fix it inside the motor housing. This not only improves the motor's sealing and corrosion resistance but also enhances its electrical insulation performance, thus improving the motor's reliability. During the adhesive application process, a mandrel can be inserted into the inner hole of the motor stator to seal it. However, gaps may exist between the mandrel and the stator core, causing adhesive to be applied to the inner surface of the core. After the adhesive has cured, removing the mandrel from the stator can be difficult, and forced demolding can sometimes damage the product, reducing the product's yield rate. Utility Model Content

[0003] This application provides a stator potting device, which can solve the problem of difficult demolding of mandrels.

[0004] According to one aspect of this application, one embodiment provides a motor stator potting device, comprising:

[0005] A mandrel is used to be inserted into the inner hole of the stator to seal the inner hole. The mandrel includes a first shaft section and a second shaft section. The diameter of the second shaft section is larger than the diameter of the first shaft section. The first shaft section and the second shaft section are connected by a tapered ramp section.

[0006] The first shaft segment includes a large-diameter segment and a small-diameter segment. The diameter of the large-diameter segment is adapted to match the diameter of the inner hole to position the mandrel. The small-diameter segment corresponds to the end wall of the inner hole. The diameter of the small-diameter segment is smaller than the diameter of the large-diameter segment, so as to form a deformation space between the small-diameter segment and the wall of the inner hole for the mandrel to expand and contract with heat.

[0007] In one embodiment, the diameter of the smaller diameter segment is 0.06 mm to 0.12 mm smaller than the diameter of the larger diameter segment.

[0008] In one embodiment, the large-diameter section is located in the middle of the first shaft section, and the small-diameter sections are located at both ends of the first shaft section. The diameter of the small-diameter sections at both ends is smaller than the diameter of the large-diameter section. The small-diameter sections at both ends are used to correspond to the glue injection hole sections at the ends of the inner hole, so as to form a space for receiving glue material between the small-diameter sections and the glue injection hole sections.

[0009] In one embodiment, the outer periphery of the second shaft segment is used to form an annular injection port between itself and the inner wall of the motor housing, and the outer periphery sidewall of the second shaft segment is the sidewall of the inner side of the injection port.

[0010] In one embodiment, the mandrel includes a third shaft segment connected to one end of the first shaft segment, the third shaft segment being used to insert into a bearing hole on the motor end cover to seal the bearing hole.

[0011] In one embodiment, a stepped surface is provided between the third shaft segment and the first shaft segment, the stepped surface being used to abut against the end face of the end cap to form axial positioning of the mandrel.

[0012] In one embodiment, the mandrel is made of polyoxymethylene or polymethyl methacrylate.

[0013] In one embodiment, the potting device further includes a base located at one end of the mandrel, the base being used to connect to the end face of the motor end cap.

[0014] In one embodiment, the base has a through hole extending along the axial direction of the mandrel, and one end of the mandrel has a threaded hole. The base is used to fix the base, the end cap, and the mandrel together by means of a screw passing through the through hole and the hole on the end cap engaging with the threaded hole.

[0015] In one embodiment, the diameter of the base is adapted to fit the positioning hole of the dispensing device to secure the dispensing device.

[0016] According to the stator potting device of the above embodiment, the mandrel includes a first shaft segment and a second shaft segment. The first shaft segment and the second shaft segment are connected by a tapered ramp segment. The first shaft segment includes a large diameter segment and a small diameter segment. The diameter of the large diameter segment is adapted to match the diameter of the inner hole to position the mandrel. The small diameter segment corresponds to the end wall of the inner hole. The diameter of the small diameter segment is smaller than the diameter of the large diameter segment, so as to form a deformation space for thermal expansion and contraction of the mandrel between the small diameter segment and the wall of the inner hole. During glue application, the mandrel expands due to heat, increasing the diameter of the small-diameter section. After the glue material cools and solidifies, the mandrel shrinks back, and the restored diameter of the small-diameter section creates a gap on its outer circumference, reducing demolding difficulty. Furthermore, the ramp between the first and second shaft sections allows for the formation of a sloping shaft hole on the cooled glue material. This eliminates the need for subsequent processing to create the ramp, reducing processing steps and further reducing demolding difficulty. Reduced demolding difficulty facilitates the smooth removal of the mandrel from the stator, minimizing product damage and improving product yield. Moreover, the large-diameter section of the mandrel matches the diameter of the inner hole, providing good positioning and sealing within the stator's inner hole, thus improving product quality and production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a stator glue-filling device according to one embodiment;

[0018] Figure 2 This is a schematic diagram of a mandrel installed in the inner hole of a stator according to one embodiment.

[0019] Figure 3 This is a schematic cross-sectional view of a mandrel installed in the inner hole of a stator according to one embodiment.

[0020] Figure 4 As one embodiment Figure 3 Enlarged view of A in the image;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Mandrel, 101-Second shaft section, 102-Sloping section, 103-Large diameter section, 104-Stepped surface, 105-Small diameter section, 106-Third shaft section, 107-First shaft section, 108-Threaded hole; 2-Base; 3-Injection port; 4-Housing, 401-End cap, 402-Bearing hole; 5-Circuit board; 6-Stator, 601-Injection hole section; 7-Screw. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0024] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0026] During the manufacturing process of electric motors, it is sometimes necessary to apply adhesive to the motor stator to fix it inside the motor housing. This not only improves the motor's sealing and corrosion resistance but also enhances its electrical insulation performance, thus improving the motor's reliability. During the adhesive application process, a mandrel can be inserted into the inner hole of the motor stator to seal it. However, gaps may exist between the mandrel and the stator core, causing adhesive to be applied to the inner surface of the core. After the adhesive has cured, removing the mandrel from the stator can be difficult, and forced demolding can sometimes damage the product, reducing the product's yield rate.

[0027] This application provides a mandrel comprising a first shaft segment and a second shaft segment. The first shaft segment and the second shaft segment are connected by a tapered ramp segment. The first shaft segment includes a large diameter segment and a small diameter segment. The diameter of the large diameter segment is adapted to match the diameter of the inner hole to position the mandrel. The small diameter segment corresponds to the end wall of the inner hole, and the diameter of the small diameter segment is smaller than the diameter of the large diameter segment. During glue application, the mandrel expands due to heat, increasing the diameter of the small-diameter section. After the glue material cools and solidifies, the mandrel shrinks back, and the restored diameter of the small-diameter section creates a gap on its outer circumference, reducing demolding difficulty. Furthermore, the ramp between the first and second shaft sections allows for the formation of a sloping shaft hole on the cooled glue material, eliminating the need for subsequent chamfering and reducing processing steps. The ramp also helps reduce demolding difficulty. Reduced demolding difficulty facilitates the smooth removal of the mandrel from the stator, minimizing product damage and improving product yield and production efficiency. Moreover, the large-diameter section of the mandrel matches the diameter of the inner hole, providing good positioning and sealing within the stator's inner hole, thus improving product quality.

[0028] The following describes some embodiments of the stator potting apparatus provided in this application with reference to the accompanying drawings.

[0029] Please see Figures 1 to 4 This application provides a stator potting device, including a mandrel 1 and other functional components as needed, which are described in detail below.

[0030] In this embodiment, the mandrel 1 is inserted into the inner hole of the stator 6 to seal the inner hole. The mandrel 1 includes a first shaft segment 107 and a second shaft segment 101. The diameter of the second shaft segment 101 is larger than the diameter of the first shaft segment 107. The first shaft segment 107 and the second shaft segment 101 are connected by a tapered ramp segment 102. The first shaft segment 107 includes a large diameter segment 103 and a small diameter segment 105. The diameter of the large diameter segment 103 is adapted to match the diameter of the inner hole to position the mandrel 1. The small diameter segment 105 corresponds to the end wall of the inner hole. The diameter of the small diameter segment 105 is smaller than the diameter of the large diameter segment 103 to form a deformation space between the small diameter segment 105 and the wall of the inner hole for the mandrel 1 to expand and contract thermally.

[0031] It is understandable that the mandrel 1 is inserted into the inner hole of the stator 6 to seal the inner hole, thus forming a seal on the inner hole of the stator 6. Part of the shaft section of the mandrel 1 can be used to seal the inner hole of the stator 6 to prevent the injected adhesive from seeping into the inner hole of the stator 6. Part of the shaft section can also serve as a molding die for adhesive injection, so that after adhesive injection, the molded adhesive has an axial through hole communicating with the inner hole of the stator 6. In some applications, during motor manufacturing, the stator 6 can be inserted into the motor housing 4 through an opening at one end of the motor housing 4. Then, the mandrel 1 is inserted into the inner hole of the stator 6 through an opening at one end of the motor housing 4. Adhesive injection then begins, covering one or both ends of the stator 6. After the adhesive cools and solidifies, the stator 6 is fixed inside the housing 4. Finally, the mandrel 1 is removed, completing the adhesive injection process. In some embodiments, such as... Figure 2 , Figure 3 As shown, a circuit board 5 is provided at the end of the stator 6. The injected adhesive can cover the circuit board 5, thereby further fixing the circuit board 5 to the end of the stator 6 and protecting it. In some embodiments, the injected adhesive can also penetrate into the gap between the stator 6 and the housing 4, as well as other gaps or spaces. In this application, the diameter of each shaft segment on the mandrel 1 is the outer circumferential diameter of the corresponding part on the mandrel 1. In this embodiment, the mandrel 1 can be a solid round shaft or a hollow round shaft with a hole structure.

[0032] In this embodiment, as Figure 1 , Figure 3 As shown, the first shaft segment 107 and the second shaft segment 101 are connected by a tapered ramp segment 102. The end of the ramp segment 102 near the second shaft segment 101 corresponds to the end face of the adhesive material formed after injection. During injection, the adhesive material gradually covers the end of the stator 6, and the liquid level of the adhesive material continues to rise as it is continuously injected. When the liquid level of the adhesive material is flush with the top of the ramp segment 102, or when the liquid level of the adhesive material is close to the top of the ramp segment 102, the injection of the adhesive material is stopped and the material is cooled and solidified. The part of the solidified adhesive material that contacts the ramp segment 102 forms a ramp, thus eliminating the need for an additional chamfering process, which helps to reduce processing steps, improve production efficiency, and solve the problem of low pass rate in manual chamfering. The chamfer formed in this way has better consistency, which helps to improve the aesthetics of the product. At the same time, the ramp also helps to reduce the difficulty of demolding. In some embodiments, a circuit board 5 is provided at the end of the stator 6. To improve structural and operational stability, the circuit board 5 can be encapsulated in adhesive material, meaning that during the potting process, the liquid level of the injected adhesive material covers the circuit board 5. For example... Figure 3As shown, in this embodiment, the bottom end of the ramp section 102 can be higher than the top surface of the circuit board 5. That is, the top end of the first shaft section 107 is flush with or higher than the top surface of the circuit board 5. Because the top end of the ramp section 102 corresponds to the end face of the adhesive material formed after potting, the cured adhesive material can completely cover the circuit board 5 at the lower position, effectively protecting the circuit board 5. At the same time, it can also prevent the circuit board 5 from being squeezed when the core rod 1 expands due to the low chamfer position. The size of the ramp section 102 in this embodiment can be designed according to the chamfer size required in the product.

[0033] In this embodiment, the first shaft segment 107 includes a large-diameter segment 103 and a small-diameter segment 105. The diameter of the large-diameter segment 103 is adapted to the diameter of the inner hole of the stator 6. That is, the diameter of the large-diameter segment 103 needs to be such that it fits tightly in the inner hole of the stator 6 to form a seal, and to allow the mandrel 1 to be smoothly inserted into the inner hole of the stator 6 during assembly. The small-diameter segment 105 corresponds to the end wall of the inner hole. Because the diameter of the small-diameter segment 105 is smaller than the diameter of the large-diameter segment 103, and the diameter of the large-diameter segment 103 is adapted to the size of the inner hole of the stator 6, a deformation space can be formed between the small-diameter segment 105 and the inner hole wall of the stator 6. This deformation space can provide space for the mandrel 1 to expand when heated. In some embodiments, the expanded mandrel 1 fills the deformation space completely, allowing the small-diameter section 105 to fit against the wall of the inner hole. After cooling, the mandrel 1 retracts, leaving a gap between the small-diameter section 105 and the wall of the inner hole, which facilitates smooth demolding. In some embodiments, the end of the inner hole is provided with a glue injection hole section 601. The diameter of the glue injection hole section 601 is larger than the diameter of the hole section that mates with the large-diameter section 103 of the mandrel 1. In this case, the deformation space formed between the small-diameter section 105 and the wall of the inner hole is relatively large. The expanded mandrel 1 fills the deformation space, but only partially, leaving the remaining space for the glue to flow in and form a glue section at the end of the inner hole. This glue section can increase the firmness of the bond between the glue and the stator 6. After cooling, the mandrel 1 retracts, leaving a gap between the small-diameter section 105 and the glue section, which also facilitates smooth demolding. Furthermore, the large-diameter section 103 expands when heated, and this expansion is restricted by the stator 6. This allows the large-diameter section 103 to expand tightly within the inner hole of the stator 6 during glue pouring, which helps improve the sealing effect of the mandrel 1 on the inner hole. After cooling, the large-diameter section 103 can recover its deformation for easy demolding. In this embodiment, the specific values ​​of the diameters of the large-diameter section 103 and the small-diameter section 105 are not limited. They can be adjusted according to different stators 6. In some application scenarios, multiple mandrels 1 of different models can be set for different inner hole sizes corresponding to different stators 6.

[0034] The stator potting device provided in this embodiment includes a mandrel 1 comprising a first shaft segment 107 and a second shaft segment 101. The first shaft segment 107 and the second shaft segment 101 are connected by a tapered ramp segment 102. The first shaft segment 107 includes a large diameter segment 103 and a small diameter segment 105. The diameter of the large diameter segment 103 is adapted to match the diameter of the inner hole to position the mandrel 1. The small diameter segment 105 corresponds to the end wall of the inner hole, and the diameter of the small diameter segment 105 is smaller than the diameter of the large diameter segment 103. During glue pouring, the mandrel 1 expands due to heat, and the diameter of the small-diameter section 105 increases. After the glue material cools and solidifies, the mandrel 1 can shrink back. The restored diameter of the small-diameter section 105 can form a gap on its outer periphery, which reduces the difficulty of demolding. Furthermore, through the ramp section 102 between the first shaft section 107 and the second shaft section 101, a shaft hole with a ramped end can be formed on the glue material after the glue pouring and cooling. This not only eliminates the need for subsequent processing to form the ramp, reducing processing steps, but also helps to reduce the difficulty of demolding. The reduced demolding difficulty makes it easier for the mandrel 1 to be smoothly removed from the stator 6, reducing the risk of product damage and improving product qualification rate and production efficiency. Moreover, the large-diameter section 103 of the mandrel 1 is matched with the diameter of the inner hole. The large-diameter section 103 fits in the inner hole of the stator 6, which not only provides good positioning for the mandrel 1 but also forms a good seal, which helps to improve product quality.

[0035] In one embodiment, the diameter of the smaller diameter segment 105 is 0.06mm-0.12mm smaller than the diameter of the larger diameter segment 103. Within this range, the diameter of the expanded smaller diameter segment 105 can be the same as or almost the same as the diameter of the larger diameter segment 103, which is beneficial to improving the smoothness of the inner hole wall of the stator 6. In some embodiments, the mandrel 1 made of different materials can be set with different differences between the diameter of the smaller diameter segment 105 and the diameter of the larger diameter segment 103. For example, when the expansion amount of the mandrel 1 after heating is large, the difference between the diameter of the smaller diameter segment 105 and the diameter of the larger diameter segment 103 can be set to be relatively large, while when the expansion amount of the mandrel 1 after heating is small, the difference between the diameter of the smaller diameter segment 105 and the diameter of the larger diameter segment 103 can be set to be relatively small. In some application scenarios, depending on the material properties of the mandrel 1, the difference between the diameter of the small diameter section 105 and the diameter of the large diameter section 103 can be set to be less than 0.06mm, for example, 0.05mm, or the difference between the diameter of the small diameter section 105 and the diameter of the large diameter section 103 can be set to be greater than 0.12mm, for example, 0.13mm.

[0036] In one embodiment, such as Figure 1 , Figure 3 , Figure 4As shown, the large-diameter section 103 is located in the middle of the first shaft section 107, and the small-diameter sections 105 are located at both ends of the first shaft section 107. The diameter of the small-diameter sections 105 at both ends is smaller than the diameter of the large-diameter section 103. The small-diameter sections 105 at both ends are used to correspond to the glue injection hole sections 601 at the end of the inner hole, so as to form a space for receiving the glue material between the small-diameter sections 105 and the glue injection hole sections 601. This space is the relatively large deformation space formed between the small-diameter sections 105 and the inner hole wall when the glue injection hole sections 601 are present. In some embodiments, it is necessary to inject glue at both ends of the stator 6. In this case, small-diameter sections 105 can be provided at both ends of the large-diameter section 103, so that after the glue is injected at both ends and cooled, gaps can be formed at the corresponding small-diameter sections 105 for demolding. When the inner hole has the glue injection hole sections 601, the bonding strength between the glue material and the stator 6 can be increased, thereby the stator 6 can be stably fixed in the motor housing 4. In some applications, glue can be injected at both ends of the stator 6, or glue can be injected at one end of the stator 6, with the injected glue flowing to the other end of the stator 6 through a flow channel or gap. For example, glue can be injected at one end of the stator 6, filling the injection space and the injection hole segment 601 at that end. Simultaneously, the glue flows through the gap between the stator 6 and the housing 4 to the other end of the stator 6, covering the other end of the stator 6 and filling the injection hole segment 601 at that end. After cooling, there are gaps between the small-diameter segments 105 at both ends and the glue segments in the injection hole segment 601 to facilitate demolding. The gap between the stator 6 and the housing 4 also contains glue, thereby increasing the stability of the stator 6 fixed within the housing 4. In some embodiments, when only one end of the stator 6 needs to be glued, a small-diameter segment 105 can be provided only at that end, and the other end can be directly fitted with the inner hole by the large-diameter segment 103.

[0037] In one embodiment, such as Figure 2 , Figure 3 As shown, the outer periphery of the second shaft segment 101 forms an annular injection port 3 between itself and the inner wall of the motor housing 4. The outer periphery of the second shaft segment 101 is the inner side wall of the injection port 3. The injection port 3 is formed by the assembly gap between the mandrel 1 and the motor housing 4. No additional injection port 3 or injection cover plate is required, which simplifies the device structure and reduces processing difficulty, lowers costs, simplifies loading and unloading, and improves production efficiency. During injection, the automatic injection machine can be programmed to make the injection head draw circles or make dots along the annular injection port 3. In some applications, injection can also be performed manually along the annular injection port 3. In some embodiments, the injection port 3 can be placed in other parts of the device as needed, for example, on the mandrel 1, where injection is performed through the flow channel on the mandrel 1.

[0038] In one embodiment, such as Figure 1 , Figure 3As shown, the mandrel 1 includes a third shaft segment 106, which is connected to one end of the first shaft segment 107. The third shaft segment 106 is used to insert into the bearing hole 402 on the motor end cover 401 to seal the bearing hole 402. During assembly, the mandrel 1 is directly inserted, so that the first shaft segment 107 of the mandrel 1 fits in the inner hole of the stator 6, and the third shaft segment 106 fits in the bearing hole 402 on the motor end cover 401. The second shaft segment 101 protrudes from the end of the stator 6 and forms a glue injection port 3 between it and the motor housing 4. The third shaft segment 106, inserted into the bearing hole 402 on the motor end cover 401, can seal the bearing hole 402. The diameter of the third shaft segment 106 can be adapted to the diameter of the bearing hole 402.

[0039] In one embodiment, a stepped surface 104 is provided between the third shaft segment 106 and the first shaft segment 107. The stepped surface 104 is used to abut against the end face of the end cover 401 to form an axial positioning of the mandrel 1. The diameter of the third shaft segment 106 is smaller than the diameter of the first shaft segment 107, thereby forming the stepped surface 104 between the third shaft segment 106 and the first shaft segment 107. The stepped surface 104 may be, but is not limited to, a surface perpendicular to the side wall of the third shaft segment 106. When the mandrel 1 is inserted, the stepped surface 104 abuts against the end face of the end cover 401, i.e., the mandrel 1 is inserted into place. The stepped surface 104 abutting against the end face of the end cover 401 forms an axial positioning of the mandrel 1. In some embodiments, the mandrel 1 may not have a third shaft segment 106, and the bearing hole 402 on the motor end cover 401 may be sealed by other structures or components. The mandrel 1 may also be axially positioned by other means.

[0040] In one embodiment, the mandrel 1 is made of polyoxymethylene (POM) or polymethyl methacrylate (PMMA). POM and PMMA are low-cost and have a long service life, and their coefficients of thermal expansion are well-matched with the product performance, meaning they can generate appropriate volumetric deformation during expansion, which is beneficial for good deformation filling when the mandrel 1 expands due to heat. The above two materials are merely examples; the mandrel 1 is not limited to these two materials and can also be made of other plastics, as long as they allow for good deformation filling when the mandrel 1 expands due to heat.

[0041] In one embodiment, such as Figure 2 , Figure 3 As shown, the glue-dispensing device also includes a base 2, which is located at one end of the mandrel 1 and is used to connect to the end face of the motor end cover 401. The base 2, connected to the end face of the motor end cover 401, protects the end cover 401 from direct contact during operation, thus improving the appearance protection effect. In some embodiments, the base 2 may be omitted if necessary, and only the mandrel 1 may be used for glue dispensing assistance.

[0042] In one embodiment, such as Figure 3As shown, when the dispensing device includes a base 2, the base 2 has a through hole extending along the axial direction of the mandrel 1. One end of the mandrel 1 has a threaded hole 108. The base 2 is used to fix the base 2, end cap 401, and mandrel 1 together by means of a screw 7 passing through the through hole and the hole on the end cap 401 engaging with the threaded hole 108. Fixing the base 2, end cap 401, and mandrel 1 together with screws 7 simplifies assembly and improves production efficiency. Moreover, this connection method does not damage the mating surface of the outer peripheral sidewall of the mandrel 1, nor does it damage the product structure of the end cap 401. At the same time, this connection method prevents the mandrel 1 from coming out after it is fixed, which helps to improve the stability of dispensing.

[0043] In some embodiments, the diameter of the base 2 can be adapted to the positioning hole of the dispensing equipment to fix the dispensing device. During assembly, the mandrel 1 is inserted into the inner hole of the stator 6, and the base 2 is placed on the outer surface of the end cover 401. The base 2, end cover 401, and mandrel 1 are fixed together by screws 7. Then, the integrated structure can be assembled onto the dispensing equipment, which can be the aforementioned automatic dispensing machine. When assembled onto the dispensing equipment, the circular base 2 can fit into the positioning hole provided on the carrier plate of the dispensing equipment. The diameter of the base 2 is adapted to the positioning hole of the dispensing equipment, thereby forming the positioning of the dispensing device. In some application scenarios, the base 2 can also be other shapes, such as rectangular or elliptical, and the corresponding positioning hole on the carrier plate can also be set as rectangular or elliptical.

[0044] In the stator potting device provided in the above embodiment, the mandrel 1 includes a first shaft segment 107 and a second shaft segment 101. The first shaft segment 107 and the second shaft segment 101 are connected by a tapered ramp segment 102. The first shaft segment 107 includes a large diameter segment 103 and a small diameter segment 105. The diameter of the large diameter segment 103 is adapted to match the diameter of the inner hole to position the mandrel 1. The small diameter segment 105 corresponds to the end wall of the inner hole. The diameter of the small diameter segment 105 is smaller than the diameter of the large diameter segment 103. During glue application, the mandrel 1 expands due to heat, increasing the diameter of the small-diameter section 105. After the glue material cools and solidifies, the mandrel 1 can shrink back, and the restored diameter of the small-diameter section 105 creates a gap on its outer circumference, reducing demolding difficulty. Furthermore, the ramp section 102 between the first shaft section 107 and the second shaft section 101 forms a sloping shaft hole on the cooled glue material, eliminating the need for subsequent processing to create the ramp and reducing processing steps. The ramp also helps reduce demolding difficulty. Reduced demolding difficulty facilitates the smooth removal of the mandrel 1 from the stator 6, minimizing damage to the product and improving product yield and production efficiency. Moreover, the large-diameter section 103 of the mandrel 1 matches the diameter of the inner hole. The large-diameter section 103 fits within the inner hole of the stator 6, providing good positioning and sealing for the mandrel 1, thus improving product quality.

[0045] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A stator glue-filling device, characterized in that, include: A mandrel is used to be inserted into the inner hole of the stator to seal the inner hole. The mandrel includes a first shaft section and a second shaft section. The diameter of the second shaft section is larger than the diameter of the first shaft section. The first shaft section and the second shaft section are connected by a tapered ramp section. The first shaft segment includes a large-diameter segment and a small-diameter segment. The diameter of the large-diameter segment is adapted to match the diameter of the inner hole to position the mandrel. The small-diameter segment corresponds to the end wall of the inner hole. The diameter of the small-diameter segment is smaller than the diameter of the large-diameter segment, so as to form a deformation space between the small-diameter segment and the wall of the inner hole for the mandrel to expand and contract with heat.

2. The stator glue-filling device as described in claim 1, characterized in that, The diameter of the smaller diameter segment is 0.06mm-0.12mm smaller than the diameter of the larger diameter segment.

3. The stator glue-filling device as described in claim 1, characterized in that, The large-diameter section is located in the middle of the first shaft section, and the small-diameter sections are located at both ends of the first shaft section. The diameter of the small-diameter sections at both ends is smaller than the diameter of the large-diameter section. The small-diameter sections at both ends are used to correspond to the glue injection hole sections at the ends of the inner hole, so as to form a space for receiving glue material between the small-diameter sections and the glue injection hole sections.

4. The stator glue-filling device according to any one of claims 1-3, characterized in that, The outer periphery of the second shaft segment is used to form an annular injection port between itself and the inner wall of the motor housing, and the outer periphery sidewall of the second shaft segment is the sidewall of the inner side of the injection port.

5. The stator glue-filling device according to any one of claims 1-3, characterized in that, The mandrel includes a third shaft segment connected to one end of the first shaft segment. The third shaft segment is used to be inserted into the bearing hole on the motor end cover to seal the bearing hole.

6. The stator glue-filling device as described in claim 5, characterized in that, The third shaft segment has a stepped surface between it and the first shaft segment. The stepped surface is used to abut against the end face of the end cap to form the axial positioning of the mandrel.

7. The stator glue-filling device according to any one of claims 1-3, characterized in that, The mandrel is made of polyoxymethylene or polymethyl methacrylate.

8. The stator glue-filling device according to any one of claims 1-3, characterized in that, The glue-dispensing device also includes a base located at one end of the mandrel, which is used to connect to the end face of the motor end cover.

9. The stator glue-filling device as described in claim 8, characterized in that, The base has a through hole extending along the axial direction of the mandrel, and one end of the mandrel has a threaded hole. The base is used to fix the base, the end cap, and the mandrel together by passing a screw through the through hole and engaging with the threaded hole on the end cap.

10. The stator glue-filling device as described in claim 8, characterized in that, The diameter of the base is adapted to fit the positioning hole of the dispensing device to fix the dispensing device.

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