Glue pouring tool for miniature brushless motor stator and glue pouring process thereof

Abstract

The invention relates to a glue pouring tool of a miniature brushless motor stator and a glue pouring process thereof, and the glue pouring tool of the miniature brushless motor stator comprises a housing which comprises a cylindrical cavity and is configured to accommodate a stator housing and a stator coil; the cover plate is arranged on the shell and is configured to seal the cavity; the clamping devices are arranged at the two ends of the shell and the two ends of the cover plate and are configured to press the cover plate on the shell; the positioning rod is arranged in the cavity, extends out of the cover plate and is configured to fix the position of the stator coil; wherein the positioning rod comprises a liquid channel, and the liquid channel is communicated with a central hole of the stator coil and is used for accommodating glue to enter the stator shell to wrap the stator coil. The glue filling tool is simple in structure, sealing in the glue filling process can be guaranteed, the concentricity of the stator can also be guaranteed, the distance between the rotor and the coil is uniform after the rotor is installed, the torque of the motor can be improved, the service life of the motor can be prolonged, and the motor can adapt to scenes.

Description

Technical Field

[0001] The present application relates to the field of motor manufacturing, and in particular to a glue filling tool and a glue filling process for a stator of a micro brushless motor. Background Art

[0002] As a new type of motor, the brushless DC motor (BLDC) is an upgraded version of the traditional brushed motor. The structure of the brushless motor is relatively special. Generally speaking, it includes a stator and a rotor. Multiple winding coils are installed on the stator, and the rotor is usually composed of a permanent magnet. When the current passes through the coils on the stator, each coil will generate a magnetic field. These magnetic fields interact with the permanent magnets of the rotor to generate torque, causing the rotor to start rotating. When the direction of rotation of the rotor needs to be changed, the electronic steering gear (electronic speed controller, ESC) is used to change the direction of the current in the coil, so that the direction of the magnetic field of the stator coil can be changed, and the direction of rotation of the rotor can be changed. This commutation can be carried out continuously, which can ensure the continuous rotation of the rotor and avoid the sparks and brush wear common in brushed motors. It can also make the brushless motor have the advantages of higher efficiency, longer service life, lower noise, fast response, high reliability, etc., so it has been widely used in precision instruments, micro robots, medical equipment, aerospace and other fields.

[0003] However, the current micro brushless motors install multiple coils on the stator by winding the coils with a skeleton and then setting them in the stator, which results in a larger distance between the coils and the rotor permanent magnets, increases the excitation current, and reduces the torque of the motor, making it unable to adapt to some special working conditions. Therefore, a new stator assembly method and corresponding installation tooling are urgently needed in the field. Summary of the invention

[0004] In response to the technical problems existing in the prior art, the present application proposes a glue filling tool for the stator of a micro brushless motor, which can be applied to a new stator assembly method. Glue is poured into the stator after the coil is placed, which can ensure the concentricity of the coil and between the coil and the stator, and can ensure that after the rotor is installed in the stator, the spacing between the rotor and the coil is uniform.

[0005] The glue potting tooling for the stator of the micro brushless motor includes: a shell, which includes a cylindrical cavity and is configured to accommodate a stator shell and a stator coil; a cover plate, which is arranged on the shell and is configured to close the cavity; a clamping device, which is arranged at both ends of the shell and the cover plate and is configured to press the cover plate onto the shell; and a positioning rod, which is arranged in the cavity and extends from the cover plate and is configured to fix the position of the stator coil; wherein the positioning rod includes a liquid channel, which is connected to the center hole of the stator coil and is used to accommodate glue to enter the stator shell to wrap the stator coil.

[0006] In the glue-filling tooling for the stator of the micro brushless motor as described above, the housing comprises: a fixing sleeve and a bottom plate, wherein the bottom plate can be arranged below the fixing sleeve, and the cover plate is arranged above the fixing sleeve.

[0007] In the glue-filling tooling for the stator of the micro brushless motor as described above, the fixing sleeve comprises a first through hole configured to accommodate the stator housing, the diameter of the through hole is ≥ the diameter of the stator housing, and the height of the fixing sleeve is ≤ the height of the stator housing.

[0008] In the glue-filling tooling for the stator of the micro brushless motor as described above, the bottom plate and / or the cover plate comprises a second through hole, which is arranged concentrically with the cavity and is configured to be transitionally connected with the positioning rod.

[0009] The glue-filling tooling for the stator of the micro brushless motor as described above comprises a sealing gasket between the cover plate and the fixing sleeve and / or between the bottom plate and the fixing sleeve, and when the clamping device is clamped, the sealing gasket is pressed against both ends of the stator housing.

[0010] As described above, the glue filling tool for the stator of the micro brushless motor, the clamping device includes: an upper clamping plate, a lower clamping plate and a fastener, wherein the upper clamping plate and the lower clamping plate are respectively arranged at the two ends of the cover plate and the shell, and the fastener connects the upper clamping plate and the lower clamping plate, and is configured to adjust the distance between the upper clamping plate and the lower clamping plate.

[0011] In the glue-filling tooling for the stator of the micro brushless motor as described above, the fasteners are bolts.

[0012] In the glue-potting tool for the stator of the micro brushless motor as described above, the upper clamping plate and / or the lower clamping plate include an opening, which is configured to accommodate the extension of the positioning rod.

[0013] As described above, in the glue filling tool for the stator of the micro brushless motor, the clamping device also includes a fixing ring, which is arranged between the upper clamping plate and the lower clamping plate, and is configured to fix the position of the shell and / or the cover plate during the clamping process of the cover plate and the shell.

[0014] As described above, in the glue filling tooling for the stator of the micro brushless motor, the fixing ring comprises an upper fixing ring, a middle fixing ring and a lower fixing ring from top to bottom, wherein the upper fixing ring fixes the cover plate, the lower fixing ring and the middle fixing ring fix the housing, and the fasteners are respectively used for connecting the upper fixing ring, the lower fixing ring and the middle fixing ring.

[0015] As described above, in the glue filling tooling for the stator of the micro brushless motor, the liquid channel includes: a first channel and a second channel connected to each other, the first channel is axially arranged along the positioning rod and connected to the outside of the positioning rod, and the second channel is radially arranged along the positioning rod and opposite to the center hole of the stator coil.

[0016] According to another aspect of the present application, a glue pouring process based on the micro brushless motor stator glue pouring tool as described above is proposed, including placing the stator housing and the positioning rod in the cavity of the housing; sleeved on the positioning rod and placed in the stator housing; passing the cover plate through the positioning rod and placed on the housing to close the cavity; clamping the cover plate and the housing with the clamping device; pouring glue into the liquid channel of the positioning rod, allowing the glue to enter the stator housing to wrap the stator coil.

[0017] The glue potting process as described above further comprises: spraying a release agent on the surface of the positioning rod.

[0018] The glue pouring process as described above further comprises: pouring the glue into the liquid channel of the positioning rod under a vacuum environment of 20-60°C.

[0019] The glue potting process as described above further includes: after the glue wraps the stator coil, baking and curing at a temperature of 70-160° C., and when the glue is cured, the stator coil is packaged and nested and bonded to the stator shell.

[0020] The glue potting tooling structure of the micro brushless motor stator of the present application is simple, which can effectively ensure the sealing during the stator glue potting process, ensure the concentricity between the stator housing and the stator coil, and ensure the uniform spacing between the rotor and the coil after installation, which can effectively improve the torque of the motor, increase the service life of the motor and adapt to the scene. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Below, the preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings, wherein:

[0022] Figure 1 A schematic diagram of a glue filling tooling structure for a stator of a micro brushless motor according to an embodiment of the present application;

[0023] Figure 2 A cross-sectional view of a glue-filling tool for a stator of a micro brushless motor according to an embodiment of the present application; and

[0024] Figure 3 The present invention is a flow chart of the glue filling process of the stator glue filling tool of a micro brushless motor according to one embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or electrical changes may be made to the embodiments of the present application.

[0027] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] The present application proposes a new stator assembly method, in which a coil is placed in a stator, and glue is poured into the stator after the coil is placed, so that the coil can be packaged and glued to the stator to complete the assembly of the stator. The skeleton structure in the stator can be removed, and the distance between the coil and the rotor permanent magnet can be effectively reduced, the excitation current can be reduced, and the torque of a micro brushless motor (hereinafter referred to as "brushless motor" or "motor") can be increased.

[0029] Correspondingly, the present application also proposes a new tooling structure, which can be applied to a new stator assembly method, can inject glue into the stator after the coil is placed, and can ensure the concentricity of the coil and between the coil and the stator, can ensure that after the rotor is installed in the stator, the spacing between the rotor and the coil is uniform, and can also completely wrap the coil.

[0030] The technical solution of the present application is further described below through specific implementation methods. Those skilled in the art should understand that the following description is only for the convenience of understanding the technical solution of the present application and should not be used to limit the protection scope of the present application.

[0031] Figure 1 The figure is a schematic diagram of the glue potting tooling structure of the stator of a micro brushless motor according to an embodiment of the present application. Figure 2 The present invention is a cross-sectional view of a glue potting tool for a stator of a micro brushless motor according to an embodiment of the present application.

[0032] like Figure 1 Combined with Figure 2 As shown, a glue potting tool (hereinafter referred to as “glue potting tool”) 100 for a micro brushless motor stator includes: a housing 110 , a cover plate 120 , a clamping device 130 and a positioning rod 140 . The shell 110 includes a cylindrical cavity 111, and the stator housing 101 and the stator coil 102 can be placed in the cavity 111; the cover plate 120 is arranged on the shell 111, and can close the cavity 111, so that the stator housing and the stator coil can be closed in the cavity 111; the clamping device 130 is arranged outside the shell 110 and the cover plate 120 (such as being arranged at both ends of the shell 110 and the cover plate 120), and can move toward the shell 110 or the cover plate 120, and can press the cover plate on the shell to prevent the cover plate from falling off from the shell or the glue from overflowing during glue pouring, which affects the glue pouring and packaging of the stator housing and the stator coil; the positioning rod 140 is arranged in the cavity 111, and can be extended from the cover plate 120, and can be used to fix the position of the stator coil.

[0033] In some embodiments, the diameter of the cavity 111 is the same as or slightly larger than the diameter of the stator housing. The stator housing is disposed in the cavity, and the stator coil is sleeved on the positioning rod, which drives the coil to be placed in the stator housing. Alternatively, the stator housing is disposed in the cavity, the stator coil is disposed in the stator housing, the positioning rod is disposed in the stator coil, and the position of the stator coil is fixed, so as to ensure the concentricity of the stator coil, ensure that the rotor is installed in the stator coil, and the spacing between the two is uniform.

[0034] The various structures of the glue filling tooling of the present application will be described in detail below.

[0035] In some embodiments, the housing 110 may include a fixing sleeve 112 and a bottom plate 113, wherein the bottom plate 113 is disposed below the fixing sleeve 112, and can block the bottom of the stator housing. The split housing 110 is convenient for assembling the stator housing and the stator coil, and is convenient for adjusting the positions of the two, which is beneficial for ensuring the concentricity between the stator housing and the stator coil. It is also beneficial for unpacking the tooling when abnormal conditions (such as glue leakage) occur during glue filling of the stator, and for replacing or cleaning different components. In some embodiments, the height of the fixing sleeve is the same as or slightly smaller than the height of the stator housing, so that the bottom plate 113 and / or the cover plate 120 are pressed against the stator housing under the action of the clamping device, and the glue poured into the stator housing is prevented from being retained outside the stator housing, causing glue leakage.

[0036] In some embodiments, the fixing sleeve 112 may include a first through hole 114, which runs through the entire fixing sleeve and can be used to accommodate the stator housing. The through hole on the fixing sleeve can facilitate the installation of the stator housing and the assembly of the stator. In some embodiments, the shape of the first through hole is the same as the shape of the stator housing, which is convenient for accommodating and placing the stator housing. In some embodiments, the diameter of the first through hole 114 is the same as or slightly larger than the diameter of the stator housing, which is convenient for placing the stator housing in the first through hole 114 and can also limit the position of the stator housing.

[0037] In some embodiments, the cover plate 120 is disposed above the fixing sleeve 112, and can block the top of the stator housing. In some embodiments, the cover plate 120 may include a cover plate through hole 121, which can be used to accommodate the positioning rod 140 to pass through and extend outward from the cavity. In some embodiments, the bottom plate 113 may also include a bottom plate through hole 115, which can be used to accommodate the positioning rod to pass through and extend outward from the cavity 111. The bottom plate through hole 115 and the cover plate through hole 121 cooperate with each other to fix the position of the positioning rod, and prevent the coil from moving during the glue pouring process. In some embodiments, the bottom plate through hole 115 and the cover plate through hole 121 can be concentrically arranged with the first through hole 114 or the cavity 111, which is conducive to ensuring the concentricity between the stator coil and the stator housing. In some embodiments, the bottom plate through hole 115 and the cover plate through hole 121 are transitionally matched with the positioning rod, which facilitates the assembly between the various components of the glue pouring tooling and ensures that the position of the positioning rod is fixed during the glue pouring process.

[0038] In some embodiments, the glue pouring tool 100 may further include a sealing gasket 150, which may be disposed between the cover plate and the fixing sleeve and / or between the bottom plate and the fixing sleeve. When the clamping device 130 is clamped, the sealing gasket may be pressed against both ends of the stator housing, which may effectively prevent the glue from leaking to the outside of the stator housing during the glue pouring process. In some embodiments, the sealing gasket 150 may include an opening 151, which may be used to accommodate the positioning rod passing through, thereby entering the bottom plate through hole 115 and / or the cover plate through hole 121. In some embodiments, the sealing gasket may be a silicone gasket, which facilitates the demolding of the glue in the stator housing after the glue pouring is completed.

[0039] In some embodiments, the clamping device 130 may include an upper clamping plate 131, a lower clamping plate 132 and a fastener 133. The upper clamping plate 131 and the lower clamping plate 132 are respectively arranged above the cover plate 120 and below the bottom plate 113 of the shell, and the fastener 133 connects the upper clamping plate 131 and the lower clamping plate 132, and can adjust the distance between the upper clamping plate 131 and the lower clamping plate, so that the upper clamping plate and the lower clamping plate can be moved toward the cover plate and / or the bottom plate, so that the cover plate and / or the bottom plate can be pressed against the fixing sleeve to prevent the glue from leaking out of the stator housing. In some embodiments, the fastener can be a bolt, and the upper clamping plate and the lower clamping plate are connected by bolts, which can facilitate the adjustment of the distance between the two and facilitate the assembly of the glue filling tool. In some embodiments, the upper clamping plate and / or the lower clamping plate may include an opening, which can be used to accommodate the extension of the positioning rod, so as to facilitate the subsequent glue filling of the stator.

[0040] In some embodiments, the clamping device 130 may further include a fixing ring 134, which is disposed between the upper clamping plate 131 and the lower clamping plate 132, and may be used to fix the position of the housing and / or the cover plate during the clamping process of the clamping device. In some embodiments, the fixing ring 134 includes an opening, the diameter of which is the same as the outer diameter of the housing and / or the cover plate, and may be used to accommodate the housing and / or the cover plate, thereby ensuring the position between the housing and the cover plate, and preventing the positions of the two from moving during the glue pouring process, thereby affecting the glue pouring packaging of the stator housing and the stator coil.

[0041] According to an embodiment of the present application, the fixing ring 134 may include multiple parts, such as an upper fixing ring 135, a middle fixing ring 136 and a lower fixing ring 137 from top to bottom. Among them, the upper fixing ring 135 can fix the cover plate 120, the middle fixing ring 136 can fix the fixing sleeve 112, and the lower fixing ring 137 can fix the bottom plate 113. The fastener 133 can connect the upper fixing ring 135, the middle fixing ring 136 and the lower fixing ring 137. In some embodiments, the upper fixing ring 135, the middle fixing ring 136 and the lower fixing ring 137 may include a channel, and the bolts can pass through the channel to connect the upper fixing ring 135, the middle fixing ring 136 and the lower fixing ring 137 into a whole. The split fixing ring is conducive to adjusting the position of each part of the glue filling tooling, ensuring the concentricity between the stator housing and the stator coil, and also convenient for handling abnormal situations occurring during the glue filling process.

[0042] In some embodiments, the positioning rod 140 includes a liquid channel 141, which is connected to the center hole of the stator coil and can be used to accommodate glue entering the stator housing, so that the glue can wrap the stator coil. In some embodiments, the diameter of the positioning rod 140 is the same as or slightly smaller than the diameter around the stator coil, which is convenient for determining the position of the stator coil. In some embodiments, the liquid channel 141 includes: a first channel 142 and a second channel 143 that are connected to each other. Among them, the first channel 142 is arranged along the axial direction of the positioning rod, connected to the outside of the positioning rod, and can be used to accommodate glue entering the liquid channel; the second channel 143 is arranged along the radial direction of the positioning rod, opposite to the center hole of the stator coil, and can be used to accommodate glue entering the center hole of the coil, and can make the glue diffuse from the center hole of the coil to the surrounding of the coil to wrap the coil. According to one embodiment of the present application, the second channel 143 includes two branches, which are relatively arranged on both sides of the positioning rod, and can be respectively opposite to the center holes of the two stator coils arranged in the stator housing. In some embodiments, the number of branches of the second channel can also be multiple.

[0043] The glue pouring tooling of the micro brushless motor stator of the present application utilizes a sealing gasket to seal the stator housing, and locks the sealing gasket on the fixing sleeve through a cover plate and a bottom plate. The stator housing is also poured with glue using a positioning rod, so that the stator housing is filled with glue and the stator coil is wrapped to prevent the glue from overflowing from the stator housing during the glue pouring. In addition, the glue pouring tooling of the present application adopts a multiple concentricity positioning method to meet the concentricity positioning of the stator coil and the stator housing.

[0044] Figure 3 FIG. 1 is a flow chart of the glue filling process of the stator glue filling tool of the micro brushless motor according to an embodiment of the present application. Figure 3 As shown, the present application also proposes a glue pouring process for a stator of a micro brushless motor using the above glue pouring tooling. The details are as follows:

[0045] In step 310, the stator housing and the positioning rod are placed in the cavity of the housing. In some embodiments, the stator housing can be placed in the cavity of the housing first, and then the positioning rod is inserted into the bottom plate through hole of the bottom plate of the housing. In some embodiments, a release agent can also be sprayed on the surface of the positioning rod to facilitate the removal of the positioning rod after the glue filling is completed. In some embodiments, before placing the stator housing, a sealing gasket can also be arranged in the cavity, and the lower end face of the stator housing is in contact with the sealing gasket to facilitate the sealing of the lower end face of the stator housing. In some embodiments, the sealing gasket can also be arranged between the fixing sleeve and the bottom plate of the housing. In some embodiments, the positioning rod can pass through the sealing gasket and extend into the bottom plate through hole.

[0046] In step 320, the stator coil is sleeved on the positioning rod and placed in the stator housing. In some embodiments, when the stator coil is sleeved on the positioning rod, the position of the coil needs to be adjusted, and the center hole of the coil is aligned with the glue outlet of the liquid channel on the positioning rod so that the glue can enter the coil and completely wrap the coil.

[0047] In step 330, the cover plate is passed through the positioning rod and placed on the shell to close the cavity; in some embodiments, the positioning rod can pass through the cover plate through hole of the cover plate, and the cover plate can be set above the shell to close the cavity. In some embodiments, before placing the cover plate, a sealing gasket can also be set in the cavity, and the upper end surface of the stator housing is in contact with the sealing gasket to facilitate the sealing of the upper end surface of the stator housing. In some embodiments, the sealing gasket can be set between the fixing sleeve and the cover plate. In some embodiments, the positioning rod can pass through the sealing gasket and extend into the cover plate through hole.

[0048] In step 340, the cover plate and the housing are clamped by a clamping device; the upper clamp and the lower clamp are respectively arranged above the cover plate and below the bottom plate, and the upper clamp and the lower clamp are connected by fasteners, and the distance between them is adjusted so that they are close to each other to clamp the cover plate and the housing. According to one embodiment of the present application, the fixing ring and the lower clamp can be first connected together by fasteners, and then the housing with the cover plate placed is placed in the fixing ring, and then the fasteners are connected to the upper clamp and clamped.

[0049] In step 350, glue is poured into the liquid channel of the positioning rod so that the glue enters the stator housing to wrap the stator coil. In some embodiments, the clamped glue potting tool needs to be placed in a vacuum box for glue potting. In some embodiments, the temperature in the vacuum box needs to be maintained between 20-60°C to ensure the stable flow of glue. In some embodiments, after the glue completely wraps the coil, the glue needs to be cured. In some embodiments, the glue potting tool in the vacuum box needs to be taken out and placed in a baking oven for glue curing. In some embodiments, the temperature in the baking oven is 70-160°C to facilitate the curing of the glue. In some embodiments, after the glue is cured, the glue potting tool is taken out of the baking oven, and the tool is removed after cooling to complete the packaging of the stator coil and nested and bonded with the stator housing.

[0050] The glue potting process of the present application can completely wrap and seal the stator coil, and can also be nested and bonded with the stator housing to achieve the installation of the stator assembly, which can effectively simplify the structure of the stator, and can reduce and even the distance between the stator coil and the rotor after the motor is assembled, thereby improving the torque of the motor and increasing the service life and applicable scenarios of the motor.

[0051] The above embodiments are only used to illustrate the present application, and are not intended to limit the present application. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions should also fall within the scope disclosed in the present application.

Claims

1. A glue filling tool for a micro brushless motor stator, comprising: a housing including a cylindrical cavity therein and configured to accommodate a stator housing and a stator coil; a cover plate disposed on the housing and configured to close the cavity; A clamping device, which is disposed at both ends of the housing and the cover plate and is configured to press the cover plate onto the housing; as well as a positioning rod disposed in the cavity and extending from the cover plate, and configured to fix the position of the stator coil; The positioning rod includes a liquid channel which is connected to the central hole of the stator coil and is used to allow glue to enter the stator housing to wrap the stator coil.

2. The glue-filling tool for the stator of a micro brushless motor according to claim 1, wherein the housing comprises: A fixing sleeve and a bottom plate, wherein the bottom plate can be arranged below the fixing sleeve, and the cover plate is arranged above the fixing sleeve.

3. According to the glue potting tool for the stator of the micro brushless motor as described in claim 2, the fixing sleeve includes a first through hole, which is configured to accommodate the stator housing, the diameter of the through hole is ≥ the diameter of the stator housing, and the height of the fixing sleeve is ≤ the height of the stator housing.

4. According to the glue filling tooling for the stator of the micro brushless motor as described in claim 2, the bottom plate and / or the cover plate include a second through hole, the second through hole is arranged concentrically with the cavity, and is configured to be transitionally connected with the positioning rod.

5. The glue-filling tool for the stator of the micro brushless motor according to claim 2, comprising: A sealing gasket is pressed against both ends of the stator housing when the clamping device is clamped.

6. The glue-filling tool for the stator of a micro brushless motor according to claim 1, wherein the clamping device comprises: An upper clamping plate, a lower clamping plate and a fastener, wherein the upper clamping plate and the lower clamping plate are respectively arranged at two ends of the cover plate and the shell, and the fastener connects the upper clamping plate and the lower clamping plate and is configured to adjust the distance between the upper clamping plate and the lower clamping plate.

7. The glue-filling tool for the stator of a micro brushless motor according to claim 6, wherein the fastener is a bolt.

8. The glue potting tool for the stator of a micro brushless motor according to claim 6, wherein the upper clamping plate and / or the lower clamping plate comprises an opening configured to accommodate the extension of the positioning rod.

9. According to the glue filling tool for the stator of the micro brushless motor as described in claim 6, the clamping device also includes a fixing ring, which is arranged between the upper clamping plate and the lower clamping plate, and is configured to fix the position of the shell and / or the cover plate during the clamping process of the cover plate and the shell.

10. The glue-filling tool for the stator of a micro brushless motor according to claim 9, wherein the fixing ring comprises an upper fixing ring, a middle fixing ring and a lower fixing ring from top to bottom, wherein: The upper fixing ring fixes the cover plate, the lower fixing ring and the middle fixing ring fix the shell, and the fasteners are respectively used for connecting the upper fixing ring, the lower fixing ring and the middle fixing ring.

11. The glue-filling tool for the stator of a micro brushless motor according to claim 1, wherein the liquid channel comprises: A first channel and a second channel are connected to each other, wherein the first channel is axially arranged along the positioning rod and connected to the outside of the positioning rod, and the second channel is radially arranged along the positioning rod and opposite to the center hole of the stator coil.

12. A glue pouring process based on the glue pouring tooling for the stator of a micro brushless motor according to any one of claims 1 to 11, comprising: placing the stator housing and the positioning rod in the cavity of the housing; The stator coil is sleeved on the positioning rod and placed in the stator housing; Passing the cover plate through the positioning rod and placing it on the shell to close the cavity; Clamping the cover plate and the shell by using the clamping device; Glue is poured into the liquid channel of the positioning rod, so that the glue enters into the stator housing to wrap the stator coil.

13. The glue pouring process according to claim 12, further comprising: A release agent is sprayed on the surface of the positioning rod.

14. The glue pouring process according to claim 12, further comprising: In a vacuum environment of 20-60° C., the glue is poured into the liquid channel of the positioning rod.

15. The glue pouring process according to claim 12, further comprising: After the glue wraps the stator coil, it is baked and cured at a temperature of 70-160° C. After the glue is cured, the stator coil is packaged and nested with the stator shell and fixed.

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