Glue filling method and glue filling system for motor

Abstract

The present application discloses a glue pouring method and glue pouring system for a motor, and the present application relates to the field of glue pouring for a motor. The motor comprises a housing and a stator assembly, the stator assembly is defined with a first hole for accommodating a rotating shaft assembly, and the gap of the stator assembly is connected with the first hole. The glue pouring method comprises step S20, sealing the motor at one axial end of the first hole; step S40, injecting glue into the interior of the motor from the other axial end of the first hole; step S60, inserting a mandrel into the first hole to squeeze the glue in the first hole; step S80, heating the stator assembly and the mandrel to solidify the glue and expand the mandrel in the radial direction; step S100, after the glue is completely solidified and the mandrel is contracted in the radial direction, taking out the mandrel. The beneficial effect is to improve the efficiency and quality of glue pouring for a magnetic suspension motor.

Description

Technical Field

[0001] The present application relates to the field of glue potting for motors, and in particular to a glue potting method and a glue potting system for motors. Background Art

[0002] With the increasing development of magnetic levitation motors, the application of magnetic levitation motors is becoming more and more extensive. In different application fields, the operating environment of magnetic levitation motors is also different. During the operation of the magnetic levitation motor, the heat generated inside it may not be dissipated in time, resulting in the temperature inside the magnetic levitation motor becoming higher and higher. Usually, the magnetic levitation motor is filled with glue to improve the thermal conductivity of the magnetic levitation motor and accelerate the heat dissipation. However, in the related technology, a metal core shaft is first inserted into the stator of the magnetic levitation motor, and then the magnetic levitation motor is filled with glue and vacuumed several times, resulting in poor quality and low efficiency of the magnetic levitation motor. Summary of the invention

[0003] The present application provides a glue pouring method and glue pouring system for a motor, which solves the technical problems of poor quality and low efficiency of glue pouring in a magnetic levitation motor, and achieves the technical effect of improving the efficiency and quality of glue pouring in a magnetic levitation motor.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, an embodiment of the present application provides a glue pouring method for a motor, wherein the motor comprises a housing and a stator assembly, wherein the stator assembly defines a first hole for accommodating a shaft assembly, and a gap of the stator assembly is connected to the first hole, and the glue pouring method comprises:

[0006] Step S20, sealing one axial end of the motor at the first hole;

[0007] Step S40, injecting the rubber material into the interior of the motor from the other axial end of the first hole;

[0008] Step S60, inserting the mandrel into the first hole to squeeze the rubber material in the first hole;

[0009] Step S80, heating the stator assembly and the core shaft to solidify the rubber and expand the core shaft in the radial direction;

[0010] Step S100, after the adhesive is completely cured and the mandrel is shrunk in the radial direction, taking out the mandrel.

[0011] By sealing one axial end of the first hole of the motor, the glue can be prevented from leaking out from the axial end of the first hole, so that the glue can flow more fully inside the stator assembly. Injecting the glue into the motor from the other axial end of the first hole can make the glue flow evenly from bottom to top. Since the core shaft has not been inserted at this time, the flow rate of the glue will also be correspondingly accelerated, so the efficiency of glue filling is also correspondingly improved, and the area of ​​the glue in contact with the air is larger, and it is not easy to form a dead angle for glue filling, so that the area inside the stator assembly that needs glue filling can be fully filled with glue, thereby improving the quality of glue filling. By inserting the core shaft into the first hole and squeezing the glue in the first hole, at least part of the glue in the first hole can flow into the stator gap, so that the glue in the area where glue filling is not required in the stator assembly flows into the area that needs glue filling.

[0012] In addition, the core shaft can also generate extrusion force on the glue inside the stator assembly, so that the glue inside the stator assembly flows more fully, improves the glue filling quality, improves the glue filling efficiency, heats the stator assembly and the core shaft to solidify the glue, and causes the core shaft to expand in the radial direction, so that the glue in the area inside the stator assembly that does not require glue filling can be squeezed into the stator gap, so that the glue can flow more fully and evenly inside the stator assembly, and the glue filling quality is improved. After the glue is completely solidified and the core shaft shrinks in the radial direction, the diameter of the core shaft will be smaller than the diameter of the first hole, so that the core shaft can be more conveniently removed. Before the core shaft is inserted into the stator assembly, the diameter of the core shaft is smaller than the diameter of the first hole. When the core shaft is removed from the stator assembly, the diameter of the core shaft is also smaller than the diameter of the first hole, which can reduce the probability of collision between the stator assembly and the core shaft during the insertion or removal of the core shaft, thereby improving the glue filling quality of the motor.

[0013] Optionally, before step S60, the glue pouring method further includes:

[0014] Step S41, after the rubber material is injected into the interior of the motor, the entire motor is vacuumed.

[0015] By vacuuming the motor as a whole, bubbles in the rubber can be effectively reduced or eliminated, the thermal conductivity of the motor can be improved, and the heat dissipation of the motor can be more sufficient. In addition, for rubber with high viscosity, its fluidity is poor, and it is difficult to fully fill the area inside the stator component that needs to be filled with glue. Vacuuming the motor can help the rubber to more effectively and naturally penetrate into the gap of the stator component, so that the rubber can flow more evenly inside the motor and improve the quality of glue filling.

[0016] Optionally, the stator assembly includes a radial floating ring, and in the step S60, the outer diameter of the core shaft is smaller than the inner diameter of the radial floating ring.

[0017] The outer diameter of the core shaft is smaller than the inner diameter of the radial floating ring. On the one hand, since the outer diameter of the core shaft is smaller and the inner diameter of the radial floating ring is larger, the core shaft can be more easily inserted into the stator assembly, thereby improving the glue pouring efficiency, reducing the probability of collision between the core shaft and the stator assembly, and improving the glue pouring quality.

[0018] Optionally, in step 20, one axial end of the motor in the first hole is sealed by a bottom plate.

[0019] The bottom plate is fixed to the first end of the shell, thereby sealing the first end of the first hole to prevent the glue from flowing out, so that the glue flows more fully and evenly inside the stator assembly, thereby improving the glue filling efficiency.

[0020] Optionally, an annular sealing groove is provided on the side of the bottom plate facing the motor, a sealing ring is provided in the sealing groove, and the inner diameter of the sealing groove is greater than the inner diameter of the first hole.

[0021] A sealing ring is arranged on the side of the bottom plate facing the motor, and the inner diameter of the sealing groove is larger than the inner diameter of the first hole, which can prevent the glue poured into the motor from leaking out, allowing the glue to flow fully and evenly inside the motor, thereby improving the quality and efficiency of glue pouring.

[0022] Optionally, in step 80, during the heating of the mandrel, the axial expansion of the mandrel is limited by a clamping mechanism.

[0023] During the heating process of the mandrel, when the axial expansion of the mandrel is restricted, the radial expansion of the mandrel will be relatively large. The clamping mechanism expands the mandrel in the axial direction, which can make the mandrel expand more fully in the radial direction, and then the mandrel and the inner circumference of the stator assembly are in more full contact, and the rubber is squeezed out of the area where the glue is not needed, so that the rubber flows more fully and evenly in the gap of the stator assembly, thereby improving the quality of glue pouring. In addition, the clamping mechanism can also make the mandrel contact with the bottom plate more fully by pressing the mandrel in the axial direction, and then squeeze at least part of the rubber in the first hole into the area where the glue is needed, thereby improving the quality of glue pouring.

[0024] Optionally, the clamping mechanism includes a pressure cover, an elastic member and the base plate, the pressure cover and the base plate are respectively pressed against two ends of the core shaft in the axial direction, and two ends of the elastic member are respectively connected to the pressure cover and the base plate.

[0025] The gland is arranged at the second end of the stator assembly, the bottom plate is arranged at the first end of the stator assembly, and the elastic member is arranged between the gland and the bottom plate along the axial direction of the core shaft. The elastic member connects the gland and the bottom plate, and can press the core shaft in the axial direction, so that the rubber material is squeezed into the area where the glue is required to be poured, thereby making the rubber material flow more fully and evenly, improving the quality and efficiency of glue pouring. In addition, since the elastic member has a certain elasticity, the gland can always press the core shaft against the bottom plate when the core shaft is stretched or expanded, and at the same time, the pressing force will not damage the structure of the core shaft, so that the core shaft can be reused, and the number of times the core shaft is used can be increased.

[0026] Optionally, an observation port is provided on the gland, and the observation port passes through the gland along the thickness direction of the gland.

[0027] An observation port is provided on the gland and penetrates through the gland in the thickness direction, so that the glue being poured can be observed more conveniently, so that the staff can timely control the amount of glue poured, save glue, improve the utilization efficiency of glue, avoid waste, reduce the glue pouring cost, and thus reduce the overall manufacturing cost of the motor.

[0028] Optionally, the mandrel is constructed as a piece of Teflon material.

[0029] During the glue pouring process, the Teflon mandrel is not easy to adhere to glue or other impurities, which is conducive to maintaining the cleanliness of the glue pouring and facilitating the mandrel to separate from the solidified glue. In addition, the Teflon mandrel has a large expansion capacity, and can squeeze out all the glue in the first hole after heating, and the mandrel shrinks after cooling, which facilitates the mandrel to separate from the solidified glue.

[0030] In a second aspect, the present application also provides a glue filling system, including:

[0031] The motor comprises a housing and a stator assembly, wherein the stator assembly defines a first hole for accommodating a rotating shaft assembly, and a gap of the stator assembly is in communication with the first hole;

[0032] The glue pouring device comprises a core shaft and a glue injector, wherein the core shaft is suitable for being accommodated in the first hole, wherein when the glue pouring device pours glue into the motor,

[0033] Sealing one axial end of the motor at the first hole;

[0034] The glue injection machine injects glue into the interior of the motor from the other axial end of the first hole;

[0035] inserting the mandrel into the first hole to squeeze the rubber material in the first hole;

[0036] heating the stator assembly and the mandrel to cure the rubber and expand the mandrel in a radial direction;

[0037] After the rubber compound is completely cured and the mandrel is shrunk in the radial direction, the mandrel is taken out.

[0038] The glue pouring system provided in the embodiment of the present application can prevent the glue from leaking out from the axial end of the first hole of the motor by sealing the axial end of the first hole, so that the glue can flow more fully inside the stator assembly, and injecting the glue into the interior of the motor from the other axial end of the first hole can make the glue flow evenly from bottom to top. Since the core shaft has not been inserted at this time, the flow rate of the glue will also be correspondingly accelerated, so the efficiency of glue pouring is also correspondingly improved, and the area of ​​the glue in contact with the air is larger, and it is not easy to form a dead angle for glue pouring, so that the area inside the stator assembly that needs glue pouring can be fully filled with glue, thereby improving the quality of glue pouring, and by inserting the core shaft into the first hole and squeezing the glue in the first hole, at least part of the glue in the first hole can flow into the stator gap, so that the glue in the area where glue pouring is not required in the stator assembly flows into the area that needs to be poured with glue.

[0039] In addition, the core shaft can also generate extrusion force on the glue inside the stator assembly, so that the glue inside the stator assembly flows more fully, improves the glue filling quality, improves the glue filling efficiency, heats the stator assembly and the core shaft to solidify the glue, and causes the core shaft to expand in the radial direction, so that the glue in the area inside the stator assembly that does not require glue filling can be squeezed into the stator gap, so that the glue can flow more fully and evenly inside the stator assembly, and the glue filling quality is improved. After the glue is completely solidified and the core shaft shrinks in the radial direction, the diameter of the core shaft will be smaller than the diameter of the first hole, so that the core shaft can be more conveniently removed. Before the core shaft is inserted into the stator assembly, the diameter of the core shaft is smaller than the diameter of the first hole. When the core shaft is removed from the stator assembly, the diameter of the core shaft is also smaller than the diameter of the first hole, which can reduce the probability of collision between the stator assembly and the core shaft during the insertion or removal of the core shaft, thereby improving the glue filling quality of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic diagram of the process of the glue filling method provided in the embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of the motor and the clamping assembly provided in the embodiment of the present application;

[0043] Figure 3 for Figure 2 Bottom view of

[0044] Figure 4 for Figure 2 A top view of

[0045] Figure 5 for Figure 4 Cross-sectional view in DD direction;

[0046] Figure 6 for Figure 4 Cross-section view without mandrel in DD direction.

[0047] Motor 100; housing 110; stator assembly 120; first hole 130; radial floating ring 140; spindle 150; clamping mechanism 160; gland 161; observation port 161a; elastic member 162; bottom plate 163; bolt 164; sealing ring 165; first end 170; second end 180. DETAILED DESCRIPTION

[0048] 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 those skilled in the art without creative work are within the scope of protection of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0050] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0053] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0054] With the growing development of magnetic levitation motors, magnetic levitation high-speed motors have the advantages of high power density, non-contact, low noise and small size, and are being used more and more widely. At the same time, the operating environment of the motors is becoming more and more harsh, and the operating temperature of the motors is getting higher and higher, which poses great challenges to the demagnetization of the motor permanent magnets and the aging of the electronic components. It is imperative to fill the motors with glue to protect the electronic components and improve the heat dissipation efficiency.

[0055] Epoxy resin glue has excellent electrical insulation properties, heat dissipation, vibration and impact resistance, and waterproof and anti-corrosion properties. Its linear expansion coefficient and curing shrinkage rate are relatively small. It can meet various specific requirements through formula design and is widely used as a potting glue in the motor industry.

[0056] There are two main processes for epoxy resin potting: vacuum potting and normal potting. Amine epoxy resin glue used for low-voltage electrical appliance potting mostly adopts normal potting, while high-voltage electronic components requiring good thermal conductivity mostly adopt vacuum potting. Whether it is normal potting or vacuum potting, it can be done manually or by mechanical equipment according to the product batch and potting requirements.

[0057] Mechanical glue pouring requires special equipment, and the purchase, installation and maintenance costs are high, but it has obvious advantages in terms of rapid production, consistency, and reliability. Manual glue pouring has low costs, is easy to change when errors occur, and has high flexibility. Regardless of the glue pouring method, it must be carried out strictly in accordance with the required process, and the corresponding glue pouring method can be selected based on the actual situation.

[0058] Most epoxy resin glues are two-component glues, A and B. After being heated and stirred separately, they are mixed in the specified proportion and poured in a liquid state. Vacuuming can be performed during or after the pouring process. Finally, the glue is solidified to play a protective role or improve thermal conductivity.

[0059] However, in the related art, a metal core shaft is first inserted into the stator of the magnetic levitation motor, and then glue is poured into the magnetic levitation motor from the top (opening). This easily forms a dead angle in a small area inside the magnetic levitation motor, and the vacuum area is small, and bubbles are not easy to discharge. After the stator is inserted into the metal core shaft, the glue pouring area is small, and the fluidity of the glue is relatively poor. Usually, glue pouring is required for multiple times, and after each glue pouring, in order to ensure the quality of the glue pouring, the stator of the magnetic levitation motor needs to be vacuumed, which will result in a long glue pouring time, low efficiency and poor glue pouring quality. Moreover, the metal core shaft usually needs to have a zero clearance fit with the inner surface of the motor stator to prevent the glue from flowing into the area where glue pouring is not required. This places high requirements on the processing dimensional accuracy of the core shaft and the internal components of the magnetic levitation motor. Since the metal core shaft will bond with the glue, a release agent needs to be applied to the surface of the metal core shaft before inserting the metal core shaft to reduce the chance of the metal core shaft being bonded by the glue.

[0060] In view of this, the present application proposes a glue pouring method and glue pouring system for a motor, wherein the motor comprises a housing and a stator assembly, wherein the stator assembly is defined with a first hole for accommodating a shaft assembly, and glue can be poured into the stator from the first hole, wherein the pores of the stator assembly are connected to the first hole, so that the glue can be retained in the pore portion of the stator assembly, and the glue pouring method comprises:

[0061] Step S20, sealing one axial end of the motor at the first hole;

[0062] Step S40, injecting the rubber material into the interior of the motor from the other axial end of the first hole;

[0063] Step S60, inserting the mandrel into the first hole to squeeze the rubber material in the first hole;

[0064] Step S80, heating the stator assembly and the core shaft to solidify the rubber and expand the core shaft in the radial direction;

[0065] Step S100, after the adhesive is completely cured and the mandrel is shrunk in the radial direction, taking out the mandrel.

[0066] The rubber is injected before the core shaft is inserted. The space to be filled inside the stator assembly is larger, which can make the rubber flow better inside the stator assembly and reduce the probability of dead corners inside the stator assembly causing the rubber to be unable to be filled. Then the core shaft is inserted into the first hole to squeeze the rubber in the first hole. The rubber in the area where no glue filling is required inside the stator assembly can be squeezed out of the area. Not only can the rubber be saved, but the rubber can also be used to fully conduct heat, thereby accelerating the heat exchange between the magnetic levitation motor and the outside world and reducing the temperature of the magnetic levitation motor under high-speed operation.

[0067] The motor described in the embodiments of the present application may include a magnetic levitation motor, and may also include a motor used in a molecular pump.

[0068] The stator assembly described in the embodiments of the present application includes a magnetic bearing stator and a motor stator.

[0069] For the convenience of description, the following embodiments are described by taking a glue filling method for a motor 100 according to an embodiment of the present application as an example.

[0070] Please refer to Figures 1 to 6 , a flow chart of the glue filling method provided in the embodiment of the present application; Figure 2 A schematic diagram of the structure of the motor 100 and the clamping assembly provided in an embodiment of the present application; Figure 3 for Figure 2 Bottom view of Figure 4 for Figure 2 A top view of Figure 5 for Figure 4 Cross-sectional view in DD direction; Figure 6 for Figure 4 A cross-sectional view in the DD direction without the mandrel 150 .

[0071] In this embodiment, the glue potting method is applied to a motor 100 , which includes a housing 110 and a stator assembly 120 . The stator assembly 120 defines a first hole 130 for accommodating a shaft assembly, and a gap in the stator assembly 120 is connected to the first hole 130 .

[0072] Specifically, the stator assembly 120 is arranged inside the shell 110, and the shell 110 envelops the stator assembly 120. The stator assembly 120 is provided with a first hole 130 for accommodating the rotating shaft. It should be noted that during the process of glue pouring into the motor 100, the rotating shaft is not inserted into the stator assembly 120, that is, the glue can be poured into the stator assembly 120 through the first hole 130. In addition to the first hole 130, the inside of the stator assembly 120 also has a certain gap. The gap of the stator assembly 120 is connected to the first hole 130. The glue can flow into the gap of the stator assembly 120 from the first hole 130, and can also flow into the first hole 130 from the gap of the stator assembly 120.

[0073] Please refer to Figures 1 to 6 In this embodiment, the glue filling method for the motor 100 includes:

[0074] Step S20, sealing the motor 100 at one axial end of the first hole 130;

[0075] The motor 100 includes a magnetic levitation motor 100, which is a new type of motor 100 based on magnetic levitation technology, and has the characteristics of no contact, no wear, low noise, high speed, high efficiency, etc. The magnetic levitation motor 100 controls the rotor (rotating shaft) to suspend and operate in the air through the principle of electromagnetic induction and magnetic levitation technology, thereby realizing the transmission of the motor 100. The first hole 130 refers to the stator assembly 120 of the magnetic levitation motor 100, which is originally inserted into the accommodating cavity of the rotating shaft.

[0076] Specifically, the stator assembly 120 has a first hole 130, and along the axial direction of the rotating shaft, the first hole 130 passes through both ends of the stator assembly 120. Before the motor 100 is glued, the first end 170 of the stator assembly 120 can be sealed first. The purpose of the seal is to prevent the glue from entering the inside of the stator assembly 120 from the second end 180 of the stator assembly 120 and then flowing out. After the first end 170 of the stator assembly 120 is sealed, the glue can be retained inside the stator assembly 120. Exemplarily, adhesive sealing can be used. When glue is required, a sealing plate is bonded to the first end 170 of the stator assembly 120 by bonding, so as to achieve a quick sealing effect. When the glue is poured, the sealing plate is removed.

[0077] Step S40, injecting the rubber material into the interior of the motor 100 from the other axial end of the first hole 130;

[0078] Among them, the glue can be epoxy resin glue. Epoxy resin glue is a potting glue that is made by adding curing agent, accelerator, coupling agent, diluent and other ingredients to epoxy resin as the matrix. It has the characteristics of excellent electrical properties, high hardness of the cured product, smooth surface and good gloss. The cured epoxy resin glue has good insulation properties, can effectively prevent current leakage and electromagnetic interference, and protect the safe operation of the internal circuit of the motor 100. The epoxy resin glue has high mechanical strength and stability after curing, and can withstand the vibration and impact generated during the operation of the motor 100, ensuring the long-term stable operation of the motor 100. Moreover, the epoxy resin glue also has good thermal conductivity, which can improve the heat dissipation performance inside the motor 100. Heating the glue within a certain temperature range can accelerate the curing of the glue.

[0079] Specifically, the amount of glue required can be calculated according to the model and size of the motor 100, and the glue can be poured from the sealed end (first end 170) of the stator assembly 120 to perform glue pouring. For example, a pipe can be used to extend from the second end 180 of the stator assembly 120 into the first end 170, and then glue can be added to the first end 170 of the stator assembly 120 until the glue inside the stator assembly 120 reaches a preset value. It should be noted that the amount of glue inside the stator assembly 120 needs to fill all gaps except the first hole 130. The number of glue pouring of the stator assembly 120 can be once, that is, the glue is poured into the stator assembly 120 at one time until the preset glue pouring amount is reached.

[0080] It is understandable that the amount of rubber injected into the motor 100 can be greater than the sum of the gap space in the stator assembly 120 and the gap space between the stator assembly 120 and the core shaft 150. That is, after all the rubber is injected, a portion of the rubber can be allowed to overflow from the second end 180 of the motor 100, thereby ensuring that all gaps in the stator assembly 120 are filled with rubber.

[0081] The rubber is injected into the motor 100 from the first hole 130. Since the space of the accommodating cavity formed by the first hole 130 is larger than the space of the gap inside the stator assembly 120 except the accommodating cavity, and since the rubber is in liquid state before injection and has a certain fluidity, injecting the rubber into the motor 100 from the first hole 130 can make the rubber flow more fully and evenly inside the stator assembly 120, and make the rubber more evenly distributed inside the stator assembly 120, thereby reducing the probability of dead corners of glue injection inside the stator assembly 120 (insufficient flow of rubber causes some areas inside the stator assembly 120 to be not filled with rubber).

[0082] Different from the solution in the prior art of specially providing a through hole on the motor housing to accommodate the glue needle, the solution of the present application is simpler and can directly inject glue from one axial end of the first hole 130, which not only makes the structure of the housing of the motor 100 simple and the processing difficulty low, but also makes it more convenient for the glue to enter the interior of the motor 100.

[0083] Step S60, inserting the mandrel 150 into the first hole 130 to squeeze the rubber material in the first hole 130;

[0084] The core shaft 150 may be an expansion core shaft 150 , which expands when heated and contracts when cooled. The diameter of the core shaft 150 is smaller than the diameter of the first hole 130 .

[0085] Specifically, after the glue is poured, the mandrel 150 is inserted from the axial second end 180 of the first hole 130 of the stator assembly 120, and the first end 170 (sealed end) of the stator assembly 120 is squeezed along the axial direction of the mandrel 150 until the mandrel 150 reaches the first end 170 of the stator assembly 120, so that at least part of the glue in the first hole 130 can be squeezed into the gap of the stator assembly 120. The mandrel 150 can also play a role in transmitting pressure. When the mandrel 150 is pressed into the interior of the stator assembly 120, the glue can be squeezed by the mandrel 150 to evenly and fully fill all corners of the stator assembly 120, further reducing the probability of glue pouring dead corners and improving the glue pouring quality.

[0086] It is understandable that during the glue pouring process, the first end 170 of the motor 100 is located at the bottom and the second end 180 is located at the top. When the mandrel 150 does not enter the first hole 130, the lower section of the first hole 130 is filled with glue, and the upper section of the first hole 130 is not filled with glue.

[0087] The speed of the mandrel 150 passing through the region of the first hole 130 not filled with glue is greater than the speed of the mandrel 150 passing through the region of the first hole 130 filled with glue. This ensures that the motor 100 has a sufficient glue injection speed and also ensures the glue injection quality of the motor 100.

[0088] In the present application, the generation of bubbles can be reduced by controlling the moving speed of the core shaft 150 in the area of ​​the first hole 130 filled with the glue, thereby further improving the glue potting quality of the motor 100.

[0089] Step S80, heating the stator assembly 120 and the core shaft 150 to solidify the rubber material and expand the core shaft 150 in the radial direction;

[0090] Specifically, the stator assembly 120 (including the glue) and the mandrel 150 can be heated together to solidify the liquid flowing glue into a solid glue. At room temperature, the glue solidifies very slowly, usually taking more than 24 hours. If you want to achieve a complete curing effect, you may need to wait for 3-5 days. Moreover, the volume of the mandrel 150 is generally unchanged at room temperature. Heating the mandrel 150 and the stator assembly 120 together can accelerate the curing of the glue and stably fix the glue inside the stator assembly 120. On the other hand, it can also expand the mandrel 150 so that the mandrel 150 completely fills the inside of the first hole 130, and squeezes the glue in the first hole 130 accommodating cavity out of the first hole 130 (the area without glue filling) and enters the gap of the stator assembly 120. Exemplarily, the stator assembly 120 and the mandrel 150 can be placed in an oven together, and the whole is heated, and the oven temperature is controlled at about 80 degrees Celsius to accelerate the curing of the glue.

[0091] Step S100 , after the adhesive is completely cured and the mandrel 150 is shrunk in the radial direction, the mandrel 150 is taken out.

[0092] Specifically, when the rubber is completely cured, it is in a solid state, is bonded together, and has low fluidity. At this time, the stator assembly 120 and the core shaft 150 can be placed in an environment at room temperature or below room temperature to allow the core shaft 150 to solidify and cool, shrinking radially to an initial diameter or below the initial diameter. In this way, the diameter of the core shaft 150 is smaller than the diameter of the first hole 130, making it easier to remove the core shaft 150 from the inside of the stator assembly 120.

[0093] By sealing one axial end of the first hole 130 of the motor 100, the glue can be prevented from leaking out from the axial end of the first hole 130, so that the glue can flow more fully inside the stator assembly 120, and the glue is injected into the interior of the motor 100 from the other axial end of the first hole 130, so that the glue can flow evenly from bottom to top. Since the core shaft 150 has not been inserted at this time, the flow rate of the glue will also be correspondingly accelerated, so the efficiency of glue filling is also correspondingly improved, and the area of ​​the glue in contact with the air is larger, and it is not easy to form a dead angle for glue filling, so that the area inside the stator assembly 120 that needs glue filling can be fully filled with glue, thereby improving the quality of glue filling, and by inserting the core shaft 150 into the first hole 130 and squeezing the glue in the first hole 130, at least part of the glue in the first hole 130 can flow into the stator gap, so that the glue in the area where glue filling is not required in the stator assembly 120 flows into the area that needs glue filling.

[0094] In addition, the core shaft 150 can also generate an extrusion force on the glue inside the stator component 120, so that the glue inside the stator component 120 flows more fully, improves the glue filling quality, and improves the glue filling efficiency. The stator component 120 and the core shaft 150 are heated to solidify the glue, and the core shaft 150 is expanded in the radial direction, which can squeeze the glue in the area where glue filling is not required inside the stator component 120 into the stator gap, so that the glue flows more fully and evenly inside the stator component 120, improves the glue filling quality, and after the glue is completely solidified and the core shaft 150 is expanded in the radial direction, the glue in the area where glue filling is not required inside the stator component 120 can be squeezed into the stator gap. After shrinking upward, the diameter of the core shaft 150 will be smaller than the diameter of the first hole 130, so that the core shaft 150 can be removed more conveniently. Before the core shaft 150 is inserted into the stator assembly 120, the diameter of the core shaft 150 is smaller than the diameter of the first hole 130. When the core shaft 150 is removed from the stator assembly 120, the diameter of the core shaft 150 is also smaller than the diameter of the first hole 130, which can reduce the probability of collision between the stator assembly 120 and the core shaft 150 during the insertion or removal of the core shaft 150, thereby improving the glue filling quality of the motor 100.

[0095] Please refer to Figures 1 to 6In this embodiment, before step S60, the glue pouring method further includes:

[0096] Step S41 , after the adhesive is injected into the interior of the motor 100 , the entire motor 100 is vacuumed.

[0097] Specifically, before inserting the core shaft 150, the motor 100 can be vacuumed as a whole. During the process of injecting the glue into the motor 100, the glue will come into contact with the air and generate physical bubbles. The presence of these bubbles may have an adverse effect on the product performance of the motor 100, such as reducing the thermal conductivity of the motor 100. By vacuuming the motor 100 as a whole, the bubbles in the glue can be effectively reduced or eliminated, the thermal conductivity of the motor 100 can be improved, and the heat dissipation of the motor 100 can be more sufficient. In addition, for glue with high viscosity, its fluidity is poor, and it is difficult to fill the stator assembly 120 with glue in all directions. Vacuuming the motor 100 can help the glue to penetrate into the gap of the stator assembly 120 more effectively and naturally, so that the glue can flow more evenly inside the motor 100, improving the glue filling quality.

[0098] Please refer to Figures 1 to 6 In this embodiment, the stator assembly 120 includes a radial floating ring 140 . In step S60 , the outer diameter of the core shaft 150 is smaller than the inner diameter of the radial floating ring 140 .

[0099] The radial floating ring 140 can ensure that the rotating shaft maintains a stable floating state in the motor 100 .

[0100] Specifically, the outer diameter of the core shaft 150 is smaller than the inner diameter of the radial floating ring 140. Therefore, on the one hand, since the outer diameter of the core shaft 150 is smaller and the inner diameter of the radial floating ring 140 is larger, the core shaft 150 can be more easily inserted into the stator assembly 120, thereby improving the glue pouring efficiency, reducing the probability of collision between the core shaft 150 and the stator assembly 120, and improving the glue pouring quality.

[0101] Please refer to Figures 1 to 6 In this embodiment, in step 20 , the motor 100 is sealed at one axial end of the first hole 130 through the bottom plate 163 .

[0102] Specifically, a threaded hole is provided at the first end 170 of the housing 110, and a bolt 164 is provided on the bottom plate 163. The bottom plate 163 is fixed to the first end 170 of the housing 110 through the cooperation of the bolt 164 and the threaded hole, thereby sealing the first end 170 of the first hole 130 to prevent the glue from flowing out, so that the glue flows more fully and evenly inside the stator assembly 120. Moreover, the bolt 164 structure is detachable. When the bottom plate 163 needs to be removed after the glue is poured, the bottom plate 163 can be easily removed by rotating the bolt 164, thereby improving the glue pouring efficiency.

[0103] Please refer to Figures 1 to 6 In this embodiment, a ring-shaped sealing groove is provided on the side of the bottom plate 163 facing the motor 100 , a sealing ring 165 is provided in the sealing groove, and the inner diameter of the sealing groove is larger than the inner diameter of the first hole 130 .

[0104] A sealing ring 165 is provided on the side of the bottom plate 163 facing the motor 100, and the inner diameter of the sealing groove is larger than the inner diameter of the first hole 130, which can prevent the glue poured into the motor 100 from leaking out, allowing the glue to flow fully and evenly inside the motor 100, thereby improving the quality and efficiency of glue pouring.

[0105] It is understandable that after the sealing ring 165 is placed in the sealing groove, a portion of the sealing ring 165 extends out of the sealing groove, so that after the bottom plate 163 is matched with the motor 100, the sealing ring 165 is squeezed to play a sealing role.

[0106] Please refer to Figures 1 to 6 In this embodiment, in step 80 , during the heating of the core shaft 150 , the expansion amount of the core shaft 150 in the axial direction is limited by the clamping mechanism 160 .

[0107] Specifically, during the heating of the mandrel 150, according to the principle of thermal expansion and contraction, the mandrel 150 will expand, and the clamping mechanism 160 can limit the axial expansion of the mandrel 150. During the heating of the mandrel 150, when the axial expansion of the mandrel 150 is limited, the radial expansion of the mandrel 150 will be relatively large. The clamping mechanism 160 expands the mandrel 150 in the axial direction, which can make the mandrel 150 expand more fully in the radial direction, and then the mandrel 150 is in more full contact with the inner circumference of the stator assembly 120, and the rubber is squeezed out of the area where the rubber does not need to be poured, so that the rubber flows more fully and evenly in the gap of the stator assembly 120, thereby improving the quality of the glue pouring. Moreover, the clamping mechanism 160 can also make the mandrel 150 more fully contact with the bottom plate 163 by pressing the mandrel 150 in the axial direction, and then squeeze at least part of the rubber in the first hole into the area where the rubber needs to be poured, thereby improving the quality of the glue pouring.

[0108] Please refer to Figures 1 to 6 In this embodiment, the clamping mechanism 160 includes a pressure cover 161, an elastic member 162 and a bottom plate 163. The pressure cover 161 and the bottom plate 163 are respectively pressed against the two ends of the core shaft 150 in the axial direction, and the two ends of the elastic member 162 are respectively connected to the pressure cover 161 and the bottom plate 163.

[0109] The gland 161 is arranged at the second end 180 of the stator assembly 120, the bottom plate 163 is arranged at the first end 170 of the stator assembly 120, and the elastic member 162 is arranged between the gland 161 and the bottom plate 163 along the axial direction of the core shaft 150. The elastic member 162 connects the gland 161 and the bottom plate 163, and can press the core shaft 150 in the axial direction, so that the glue is squeezed into the area where glue is required, thereby making the glue flow more fully and evenly, improving the glue filling quality and efficiency. In addition, since the elastic member 162 has a certain elasticity, the gland 161 can always press the core shaft 150 against the bottom plate 163 when the core shaft 150 is stretched or expanded, and at the same time, the pressing force will not damage the structure of the core shaft 150, so that the core shaft 150 can be reused, and the number of times the core shaft 150 is used can be increased.

[0110] Exemplarily, the elastic member 162 may be configured as a spring.

[0111] Please refer to Figures 1 to 6 In this embodiment, an observation port 161 a is provided on the pressure cover 161 , and the observation port 161 a penetrates the pressure cover 161 along the thickness direction of the pressure cover 161 .

[0112] Specifically, an observation port 161a is provided on the pressure cover 161 and the observation port 161a penetrates in the thickness direction of the pressure cover 161, which can more conveniently observe the glue being poured, so that the staff can timely control the amount of glue poured, save glue, improve the utilization efficiency of glue, avoid waste, reduce the glue pouring cost, and thus reduce the manufacturing cost of the overall motor 100.

[0113] In some embodiments, an infrared laser scanner may also be provided above the observation port 161a. When the motor 100 is being glued, infrared light may be emitted to the inside of the motor 100 to accurately detect the height of the glue inside the motor 100, thereby improving the quality and efficiency of glue pouring.

[0114] Please refer to Figures 1 to 6 In this embodiment, the core shaft 150 is constructed as a Teflon material piece.

[0115] Among them, Teflon material parts refer to polytetrafluoroethylene (PTFE), which has excellent high temperature resistance and thermal expansion and contraction characteristics. Its continuous use temperature range can reach -200℃ to 260℃, and it can even withstand higher temperatures (such as 300℃) for a short time.

[0116] When the motor 100 is filled with glue, it is usually necessary to heat the motor 100 as a whole to accelerate the solidification of the glue inside the motor 100. The Teflon material can be used for a long time in different temperature ranges without significant changes in physical and chemical properties, which can make the mandrel 150 reusable and reduce the cost of filling the motor 100. In addition, Teflon has excellent non-stickiness, and almost all substances are difficult to adhere to its surface. During the glue filling process, the Teflon mandrel 150 is not easy to adhere to glue or other impurities, which is conducive to maintaining the cleanliness of the glue filling and facilitating the mandrel to separate from the solidified glue; in addition, the mandrel of the Teflon material has a large expansion amount, and can squeeze out all the glue in the first hole after heating, and the mandrel shrinks after cooling, which facilitates the mandrel to separate from the solidified glue.

[0117] Please refer to Figures 1 to 6 In the embodiment of the present application, a glue filling system is also provided, including:

[0118] The motor 100 includes a housing 110 and a stator assembly 120. The stator assembly 120 defines a first hole 130 for accommodating a rotating shaft assembly. A gap in the stator assembly 120 is connected to the first hole 130.

[0119] The glue pouring device includes a core shaft 150 and a glue injector. The core shaft 150 is suitable for being accommodated in the first hole 130. When the glue pouring device pours glue into the motor 100,

[0120] Sealing the motor 100 at one axial end of the first hole 130;

[0121] The glue injection machine injects the glue into the motor 100 from the other axial end of the first hole 130 ;

[0122] Inserting the mandrel 150 into the first hole 130 to squeeze the rubber material in the first hole 130;

[0123] heating the stator assembly 120 and the mandrel 150 to cure the rubber and expand the mandrel 150 in a radial direction;

[0124] After the glue is completely cured and the mandrel 150 is shrunk in the radial direction, the mandrel 150 is taken out.

[0125] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0126] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0127] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0128] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for glue filling of a motor, characterized in that: The motor comprises a housing and a stator assembly, wherein the stator assembly defines a first hole for accommodating a rotating shaft assembly, a gap of the stator assembly is connected to the first hole, and the glue pouring method comprises: Step S20, sealing one axial end of the motor at the first hole; Step S40, injecting the rubber material into the interior of the motor from the other axial end of the first hole; Step S41, after the rubber material is injected into the interior of the motor, the entire motor is vacuumed; Step S60, inserting a mandrel into the first hole to squeeze the rubber material in the first hole; Step S80, heating the stator assembly and the core shaft, and limiting the axial expansion of the core shaft by a clamping mechanism, so that the rubber material solidifies and the core shaft expands in the radial direction; Step S100, after the rubber material is completely cured and the mandrel is shrunk in the radial direction, taking out the mandrel; Wherein, the glue pouring method is applied to a magnetic levitation motor, and the heating of the stator assembly and the core shaft comprises: heating the glue of the stator assembly and the core shaft together.

2. The glue pouring method for a motor according to claim 1, characterized in that: The stator assembly includes a radial floating ring. In the step S60, the outer diameter of the core shaft is smaller than the inner diameter of the radial floating ring.

3. The glue pouring method for a motor according to claim 1, characterized in that: In the step S20, one axial end of the motor in the first hole is sealed by a bottom plate.

4. The glue pouring method for a motor according to claim 3, characterized in that: An annular sealing groove is arranged on the side of the bottom plate facing the motor, a sealing ring is arranged in the sealing groove, and the inner diameter of the sealing groove is larger than the inner diameter of the first hole.

5. The glue pouring method for a motor according to claim 3, characterized in that: The clamping mechanism comprises a pressure cover, an elastic member and the bottom plate. The pressure cover and the bottom plate are respectively pressed against two ends of the core shaft in the axial direction. Two ends of the elastic member are respectively connected to the pressure cover and the bottom plate.

6. The glue pouring method for a motor according to claim 5, characterized in that: The gland is provided with an observation port, and the observation port passes through the gland along the thickness direction of the gland.

7. The glue pouring method for a motor according to claim 1, characterized in that: The core shaft is constructed of a Teflon material.

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