Casing assembly, motor and assembling method

Abstract

The invention provides a casing assembly, a motor and an assembling method. The casing assembly comprises a casing and a stator winding. A first ring body is arranged on the inner wall of the shell, the first ring body is convexly arranged along the radial direction of the shell, the stator winding is arranged in the shell in the axial direction of the shell, and the stator winding is connected with the first ring body, so that an axial glue injection runner is formed between the shell and the stator winding; a glue injection hole is formed in the shell, the glue injection hole is communicated with the axial glue injection runner, and glue flows into the glue injection hole, so that the glue is poured into the axial glue injection runner to form a glue layer. The first ring body protrudes in the radial direction of the shell, so that an axial glue injection runner is formed between the outer edge of the stator winding and the inner wall of the shell, it is ensured that each part of the winding can be fully filled with glue, and the filling uniformity is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a casing component, a motor and an assembly method. Background Art

[0002] The galvanometer motor is a motor that uses electromagnetic principles to achieve high-speed and precise swinging. Its working principle is based on Faraday's law of electromagnetic induction, that is, a conductor with current will be acted upon by a force in a magnetic field. In the galvanometer motor, this principle is used to produce high-speed swinging motion. When current passes through the coil of the galvanometer motor, according to Ampere's force law, the coil will be subjected to a force that is proportional to the product of the current and the magnetic field. Since the magnetic field is fixed, changes in the current will cause changes in the direction and magnitude of the force, causing the motor to move. This motion is transmitted to the reflector, which will swing at extremely high speed and precision.

[0003] The traditional galvanometer motor injection process is as follows Figure 1 and Figure 2 As shown, specifically: in process one, the split housing 1 is placed vertically into the assembly tool 10, and the outer cylindrical surface of the boss of the assembly tool 10 is overfitted with the inner cylindrical surface of the housing 1 to ensure that the epoxy resin does not leak due to gravity. Subsequently, the molten epoxy resin is introduced into the interior of the housing 1. After the injection is completed, process two is entered, that is, the stator winding 2 with copper wire is placed vertically into the epoxy resin along the top of the assembly tool 10. This process requires that the epoxy resin completely covers the copper wire. Finally, after completing the first two steps, the workpiece is left to solidify and the desired stator structure can be obtained. Since this method is to place the stator winding 2 into the epoxy resin from top to bottom, the air will accumulate at the bottom of the assembly tool 10 and cannot be discharged. Bubbles are mixed in the epoxy resin after molding, and the coil is composed of loose copper wire windings with a distance between the wires. Through this pressing method, air is also inevitably mixed between the casing and the coil, and the residual bubble rate is high, which reduces the tightness of the epoxy resin wrapping of the winding and the uniformity of the thermal conductivity of the stator. Summary of the invention

[0004] The present invention provides a casing component, a motor and an assembly method, which can solve the technical problem that the existing casing component injection method is to put the copper wire winding into the epoxy resin from top to bottom, and the formed epoxy resin is mixed with bubbles, which reduces the tightness of the epoxy resin wrapping the winding.

[0005] The present invention provides a housing assembly, which includes a housing and a stator winding;

[0006] A first ring body is provided on the inner wall of the shell, and the first ring body is protrudingly provided along the radial direction of the shell. In the axial direction of the shell, the stator winding is installed in the shell, and the stator winding is connected to the first ring body, so that an axial glue injection flow channel is formed between the shell and the stator winding;

[0007] The shell is provided with a glue injection hole, the glue injection hole is communicated with the axial glue injection flow channel, and the glue injection hole is used for the glue to flow into the glue so that the glue is poured into the axial glue injection flow channel to form a glue layer.

[0008] In some embodiments, a second ring body is further disposed on the inner wall of the shell, the second ring body is protrudingly disposed along the radial direction of the shell, and the stator winding is connected to the second ring body.

[0009] In some embodiments, a plurality of glue guide holes are respectively arranged along the circumference of the first ring body and / or the second ring body, and the glue guide holes penetrate the corresponding ring body along the axial direction of the shell, and the glue guide holes are connected to the axial glue injection channel.

[0010] In some embodiments, one end of the stator winding abuts against the first ring body, and the other end of the stator winding abuts against the second ring body.

[0011] In some embodiments, a rotating shaft is further included, wherein the rotating shaft is provided with a magnetic steel, wherein the magnetic steel is inserted into the stator winding, and the first ring body is located radially outside the end of the magnetic steel.

[0012] In some embodiments, the radius of the inner circumferential wall of the shell is R, the radial thickness of the axial glue injection channel is H, and the ratio of the radius R to the thickness H satisfies: 0.2≤H / R≤0.5.

[0013] In some embodiments, a rear end cover is further included, wherein the rear end cover is integrally formed with the shell, the glue injection hole is arranged close to the rear end cover, and the glue injection hole is located axially outside the magnetic steel.

[0014] A motor comprises a casing assembly, wherein the casing assembly is the above-mentioned casing assembly.

[0015] A method for assembling a casing assembly is used to assemble the above-mentioned casing assembly, wherein the casing and the rear end cover are integrally formed, and the assembly method comprises the following steps:

[0016] Assembling the housing assembly with an assembly tool;

[0017] Glue is poured into the glue injection hole, and the colloid flows into the axial glue injection channel. After the colloid is solidified, the assembly of the housing and the stator winding is completed.

[0018] In some embodiments, the assembly of the housing assembly and the assembly tool includes:

[0019] First, place the stator winding vertically into the assembly tool, with the end of the shell connected to the rear end cover placed upward, and the other end of the shell being an open structure. Then, push the assembly tool and the stator winding into the shell together, and the stator winding abuts against the first ring body.

[0020] The present invention provides a housing assembly, a motor and an assembly method, which have the following beneficial effects:

[0021] In the present invention, in terms of structure, the first ring body protrudes along the radial direction of the shell, so that an axial glue injection flow channel is formed between the outer edge of the stator winding and the inner wall of the shell. This flow channel allows the colloid to flow and distribute evenly around the stator winding. Due to the presence of the first ring body, the stator winding will not directly contact the inner wall of the shell, which helps to discharge air during the glue injection process and reduce the formation of bubbles and gaps, thereby improving the filling quality of the colloid and the reliability of the product. Moreover, the first ring body is connected to the stator winding, which helps to enhance the structural stability of the entire motor stator and improve its ability to withstand mechanical stress.

[0022] In the present invention, in terms of assembly method, compared with the traditional method of injecting glue into the shell and then placing the stator winding, the present invention first pushes the stator winding into the shell and then injects glue. In this way, the colloid can be fully filled into the copper wire gap of the stator winding. By first pushing the stator winding and then injecting glue, the colloid can be more fully filled into the copper wire gap of the stator winding, thereby improving the filling efficiency of the colloid. In addition, due to the existence of the axial glue injection flow channel, the epoxy resin is allowed to flow evenly along the length direction of the stator winding, ensuring that each part of the winding can be fully filled with the colloid, thereby improving the uniformity of the filling. Through the axial glue injection flow channel, the colloid can more effectively replace the air around the winding, thereby reducing the formation of bubbles and gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 is a schematic diagram of a conventional motor;

[0025] Figure 2 Schematic diagram of traditional motor housing and stator winding assembly;

[0026] Figure 3 is a schematic diagram of a motor according to an embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of an assembly process of a housing assembly according to an embodiment of the present invention;

[0028] Figure 5 is a schematic diagram of a housing assembly according to an embodiment of the present invention;

[0029] Figure 6 A schematic diagram of a first ring body and a second ring body according to an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the radius R and thickness H of an embodiment of the present invention;

[0031] Figure 8 This is the magnetic force line trend diagram of the traditional motor without glue guide hole;

[0032] Fig. 9 Friction torque curve of traditional motor without glue guide hole;

[0033] Fig.10 The magnetic field line trend diagram of the motor in this embodiment;

[0034] Fig.11 Friction torque curve of the motor in this embodiment;

[0035] Fig.12 The relationship between the motor H / R value and the motor efficiency of this embodiment;

[0036] Fig.13 Comparison of no-load torque between a conventional motor and the motor of this embodiment.

[0037] Figures: 1-shell; 101-glue injection hole; 2-stator winding; 3-first ring body; 4-axial glue injection channel; 5-glue layer; 6-second ring body; 7-glue guide hole; 8-magnetic steel; 9-rear end cover; 10-assembly tooling; 11-rotating shaft. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "on", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature with other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will be positioned as "below" or "below other devices or structures" afterwards.

[0041] See also Figures 3 to 5 As shown, according to an embodiment of the present invention, a housing assembly is provided, which includes a housing 1 and a stator winding 2; a first ring body 3 is arranged on the inner wall of the housing 1, and the first ring body 3 is protrudingly arranged along the radial direction of the housing 1, and in the axial direction of the housing 1, the stator winding 2 is installed in the housing 1, and the stator winding 2 is connected to the first ring body 3, so that an axial glue injection channel 4 is formed between the housing 1 and the stator winding 2; a glue injection hole 101 is provided on the housing 1, and the glue injection hole 101 is connected to the axial glue injection channel 4, and the glue injection hole 101 is used for the glue to flow in, so that the glue is poured into the axial glue injection channel 4 to form a glue layer 5.

[0042] Specifically, the inner wall of the shell 1 is provided with a first ring body 3, and the first ring body 3 is protrudingly arranged along the radial direction of the shell 1. The length direction of the stator winding 2 extends in the axial direction of the shell 1. After the stator winding 2 is pushed into the shell 1, due to the setting of the first ring body 3, the outer edge of the stator winding 2 will not fit with the inner wall of the shell 1, but will abut against the first ring body 3. In this way, in the axial direction of the shell 1, an axial glue injection channel 4 is formed between the inner wall of the shell 1 and the outer wall of the stator winding 2, and the axial glue injection channel 4 exists in the circumferential direction of the stator winding 2. The assembly of the stator winding 2 and the shell 1 needs to be completed in the assembly tool 10. The assembly tool 10 and the stator winding 2 are pushed into the shell 1 together, and the colloid is poured into the glue injection hole 101. The colloid flows into the axial glue injection channel 4 until the axial glue injection channel 4 is filled with the colloid and then left to stand for a period of time. The colloid solidifies to form a glue layer 5. The stator winding 2 is fixed in the shell 1, and the assembly of the stator winding 2 and the shell 1 is completed. The formed casing assembly is removed from the assembly tool 10.

[0043] In this embodiment, in terms of structure, the first ring body 3 protrudes in the radial direction of the shell 1, so that an axial glue injection channel 4 is formed between the outer edge of the stator winding 2 and the inner wall of the shell 1. This channel allows the colloid to flow and distribute evenly around the stator winding 2. Due to the presence of the first ring body 3, the stator winding 2 will not directly contact the inner wall of the shell 1, which helps to expel air during the glue injection process and reduce the formation of bubbles and gaps, thereby improving the filling quality of the colloid and the reliability of the product. Moreover, the first ring body 3 is connected to the stator winding 2, which helps to enhance the structural stability of the entire motor stator and improve its ability to withstand mechanical stress. In addition, during the assembly process, the first ring body 3 can be used as a positioning feature to help the stator winding 2 be correctly placed in the shell 1, which helps to improve the efficiency and accuracy of assembly.

[0044] In this embodiment, in terms of assembly method, compared with the traditional method of injecting glue into the housing 1 and then placing the stator winding 2, this embodiment first pushes the stator winding 2 into the housing 1 and then injects glue. In this way, the colloid can be fully filled into the copper wire gap of the stator winding 2. By first pushing the stator winding 2 and then injecting glue, the colloid can be more fully filled into the copper wire gap of the stator winding 2, thereby improving the filling efficiency of the colloid. In addition, due to the presence of the axial glue injection flow channel 4, the epoxy resin is allowed to flow evenly along the length direction of the stator winding 2, ensuring that each part of the winding can be fully filled with the colloid, thereby improving the uniformity of the filling. Through the axial glue injection flow channel 4, the colloid can more effectively replace the air around the winding, thereby reducing the formation of bubbles and gaps. The axial glue injection channel 4 helps the colloid to form a uniform glue layer 5 around the stator winding 2, which is equivalent to filling an additional glue layer 5 on the radial outer side of the stator winding 2, so that the colloid can be more evenly distributed around the stator winding 2, thereby improving the thermal conductivity uniformity of the stator, which is conducive to the stable operation and life extension of the motor. After the colloid in the axial glue injection channel 4 is cured, the mechanical connection between the stator winding 2 and the housing 1 can be enhanced, and the stability and durability of the entire motor stator can be improved. The axial glue injection channel 4 provides a flow path for the colloid. By accurately controlling the injection path and amount, the axial glue injection channel 4 helps to reduce the waste of the colloid and improve the utilization rate of the material.

[0045] See also Figures 3 to 6 As shown, a second ring body 6 is further provided on the inner wall of the housing 1 . The second ring body 6 is provided protrudingly along the radial direction of the housing 1 , and the stator winding 2 is connected to the second ring body 6 .

[0046] Specifically, a first ring body 3 and a second ring body 6 are provided on the inner wall of the shell 1, and both ring bodies protrude from the shell 1, so that after the stator winding 2 is pushed into the shell 1, the stator winding 2 is limited by the two ring bodies in the circumferential direction, and an axial glue injection channel 4 can still be formed between the inner wall of the shell 1 and the outer wall of the stator winding 2.

[0047] In this embodiment, the first ring body 3 and the second ring body 6 protrude in the radial direction of the housing 1, and they jointly limit the position of the stator winding 2, ensuring that the stator winding 2 is accurately positioned in both the axial and radial directions, thereby improving the accuracy and consistency of assembly. The existence of the first ring body 3 and the second ring body 6 provides additional support for the stator winding 2, enhancing the stability and mechanical strength of the entire motor structure. In addition, the two ring bodies are connected to the stator winding 2, which helps to form a continuous axial injection flow channel 4 during the injection process, so that the colloid can be evenly filled into the gap of the stator winding 2, reducing the formation of bubbles and gaps, and improving the injection quality.

[0048] As a specific implementation, the radial thickness of the first ring body 3 and the second ring body 6 is the same, that is, the degree to which the first ring body 3 and the second ring body 6 protrude from the inner wall of the shell 1 is the same. In this way, the two ring bodies protrude with the same radial thickness, which can evenly limit the position of the stator winding 2, ensuring that the stator winding 2 is evenly distributed in the circumferential direction inside the shell 1, thereby improving the consistency and accuracy of assembly. During the injection process, the two ring bodies form an axial injection channel 4 with the same protrusion degree, which helps the colloid to flow and distribute evenly around the stator winding 2, reduce the formation of bubbles and gaps, and improve the quality of injection. The two ring bodies of the same thickness provide uniform support, enhance the structural stability between the stator winding 2 and the shell 1, and improve the overall rigidity and durability of the motor.

[0049] See also Figures 3 to 6 As shown, a plurality of glue guide holes 7 are respectively arranged along the circumference of the first ring body 3 and / or the second ring body 6 , and the glue guide holes 7 penetrate the corresponding ring body along the axial direction of the housing 1 , and the glue guide holes 7 are connected to the axial glue injection channel 4 .

[0050] Specifically, after the stator winding 2 is pushed into the housing 1, due to the arrangement of the first ring body 3 and the second ring body 6, the stator winding 2 abuts against the first ring body 3 and the second ring body 6, and the colloid is poured into the glue injection hole 101, and the colloid flows into the axial glue injection channel 4. When the colloid flows to the first ring body 3 and the second ring body 6, it flows into the axial glue injection channel 4 from the glue guide hole 7, forming a glue layer 5 with a longer axial length.

[0051] In this embodiment, the presence of the glue guide hole 7 allows the colloid to flow directly from the glue injection hole into the axial glue injection channel 4, and when the colloid flows to the first ring body 3 and the second ring body 6, it can flow into the axial glue injection channel 4 through the glue guide hole 7, which can improve the efficiency and speed of glue injection. Through the glue guide hole 7, the colloid can be more evenly distributed in the circumferential direction of the stator winding 2, ensuring that the entire stator winding 2 is fully wrapped by the colloid, improving the insulation and sealing performance, and the setting of the glue guide hole 7 helps to discharge air during the glue injection process, reduce the formation of bubbles and gaps, and thus improve the density of the colloid filling and the product quality.

[0052] It is worth noting that the main function of setting the first ring body 3 and the second ring body 6 in this embodiment is to form an axial glue injection flow channel 4 between the stator winding 2 and the housing 1. If only one glue injection hole 101 is provided, the distance between the first ring body 3 and the second ring body 6 determines the length of the axial glue injection flow channel 4. The first ring body 3 and the second ring body 6 are respectively provided at both ends of the housing 1. Even if the glue guide hole 7 is not provided on the first ring body 3 and the second ring body 6, it does not affect the flow of the colloid in the axial glue injection flow channel 4. In order to better make the colloid flow, the first ring body 3 and the second ring body 6 and the position are flexibly adjusted. The setting of the glue guide hole 7 on the first ring body 3 and the second ring body 6 can make the colloid flow smoothly from the ring body without being affected by the setting position of the ring body.

[0053] As a specific implementation, the glue guide hole 7 can be set only on the first ring body 3 or the second ring body 6, or on both the first ring body 3 and the second ring body 6. Specifically, the glue guide hole 7 is set only on the first ring body 3. When the shell 1 is placed vertically for glue injection, the glue injection hole 101 is set on the top side wall of the shell 1, and the first ring body 3 is located above the second ring body 6. The glue guide hole 7 is only set on the first ring body 3. When injecting glue, the shell 1 is placed vertically instead of horizontally. When the glue is injected into the shell 1, the internal gas will be squeezed upward by the glue and discharged. Therefore, it is only necessary to open the glue guide hole 7 on the first ring body 3.

[0054] See also Figures 3 to 6 As shown, one end of the stator winding 2 abuts against the first ring body 3 , and the other end of the stator winding 2 abuts against the second ring body 6 .

[0055] In this embodiment, the position of the stator winding 2 inside the shell 1 can be accurately located by abutting at both ends, ensuring the matching relationship between the winding and the shell 1. The abutting at both ends helps to enhance the structural stability between the stator winding 2 and the shell 1, and improve the overall rigidity and durability of the motor. During the glue injection process, the abutting at both ends can ensure that the colloid flows and is evenly distributed around the stator winding 2.

[0056] As a specific implementation, in the axial direction of the shell 1, the glue injection hole 101, the first ring body 3 and the second ring body 6 are arranged in sequence, that is, after the glue flows into the axial glue injection channel 4 from the glue injection hole 101, it flows through the glue guide hole 7 of the first ring body 3, and then flows into the axial glue injection channel 4, flows through the glue guide hole 7 of the second ring body 6, and then flows into the axial glue injection channel 4.

[0057] See also Figures 3 to 6 As shown, it also includes a rotating shaft, which is passed through the housing 1 . The rotating shaft is provided with a magnetic steel 8 . The magnetic steel 8 is passed through the stator winding 2 . The first ring body 3 is located radially outside the end of the magnetic steel 8 .

[0058] Specifically, the first ring body 3 and the second ring body 6 are abutted against the two ends of the shell 1, so that the first ring body 3 and the second ring body 6 are respectively located radially outside the two ends of the magnetic steel 8. If the first ring body 3 and the second ring body 6 are provided with glue guide holes 7, it will affect the direction of the magnetic lines of force. Conventional housing components do not have ring bodies. Therefore, in this embodiment, the setting positions of the first ring body 3 and the second ring body 6 play an important role in the overall structure. Figure 8 and Fig. 9 The figure is a conventional galvanometer motor magnetic force line distribution diagram and idling friction torque diagram without glue injection hole 101. It can be observed from the figure that after the magnetic force line comes out from the S pole of the magnet 8, it passes through the stator winding 2 and the glue layer 5, and then encounters the inner wall of the shell 1. Since the shell 1 material is a magnetic conductive material, the magnetic resistance is very small and the magnetic permeability is large, so most of the magnetic force lines tend to enter the shell 1 first along the direction from the N pole to the S pole inside the magnet 8. Then, according to the principle that the magnetic flux is always closed along the path with the minimum magnetic resistance, the magnetic force lines form two closed magnetic circuits on the left and right along the inside of the shell 1. Correspondingly, since the circular ring structure of the shell 1 material corresponding to the axial position of the magnet 8 is continuous and uniform along the circumferential direction, the motor magnetic resistance along the circumferential direction is consistent, and the no-load friction torque of the motor along the circumferential direction does not fluctuate and is a fixed value T0.

[0059] In this embodiment, the first ring body 3 and the second ring body 6 are located radially outside the magnetic steel 8, and the first ring body 3 and the second ring body 6 are far away from the main magnetic field area of ​​the magnetic steel 8, thereby greatly reducing the impact on the magnetic lines of force and motor performance. It is worth noting that the radial thickness of the first ring body 3 and the second ring body 6 is relatively small compared to the thickness of the shell 1, and the corresponding size of the glue guide holes 7 on the first ring body 3 and the second ring body 6 is very small. Although the glue guide holes 7 have an impact on the direction of the magnetic lines of force, the glue guide holes 7 have limited impact on the magnetic lines of force and friction torque, and the first ring body 3 and the second ring body 6 are arranged radially outside the magnetic steel 8, which further reduces the impact of the glue guide holes 7 on the magnetic lines of force and friction torque.

[0060] As a specific implementation, the rotating shaft 11 is a segmented structure, specifically a three-segment structure. The rotating shaft 11 includes a front section, a middle section and a rear section connected in sequence. The three sections are a spliced ​​structure. The middle section is formed of a magnetic steel material to form a magnetic steel 8, which is magnetic, and the materials of the front section and the rear section are aluminum alloy materials. When the rotating shaft 11 is inserted into the housing 1, the middle section, that is, the magnetic steel 8, is also inserted into the stator winding 2. The diagram of this embodiment only shows the rotating shaft 11 with a three-segment structure. In other embodiments, the magnetic steel 8 can also be annular and sleeved on the rotating shaft 11; or the magnetic steel 8 is a block embedded in the rotating shaft 11; or the magnetic steel 8 is attached to the rotating shaft 11. It is worth noting that the above implementations must ensure that the magnetic steel 8 is inserted into the stator winding 2.

[0061] See also Figures 3 to 6As shown, it also includes a rear end cover 9 , which is integrally formed with the shell 1 , and a glue injection hole 101 is arranged close to the rear end cover 9 , and the glue injection hole 101 is located on the axial outside of the magnetic steel 8 .

[0062] In this embodiment, the conventional housing 1 is assembled with the stator winding 2. Since the housing 1 is separately connected to the front cover and the rear cover 9, both ends of the housing 1 are open structures. After the housing 1 is installed on the tooling, one end of the housing 1 is closed by the assembly tooling 10. After the other end of the housing 1 is injected with glue, the stator winding 2 is pushed into the housing 1. Air is easily retained in the glue layer 5. Moreover, since the housing 1 is separately connected to the two end covers, the rear cover 9 and the housing 1 are clearance-fitted. This structure deteriorates the coaxiality between the front and rear bearings, aggravates the friction between the bearing balls and the inner and outer raceways, and ultimately causes the motor friction torque to increase and the motor running accuracy to deteriorate. Based on this point, in order to reduce the influence of the coaxiality error of the end cover bearing position on the system accuracy, the housing 1 and the rear cover 9 are an integrated structure and are processed into an integrated part, so the problem of the coaxiality difference of the front and rear bearing positions caused by the gap between the housing 1 and the end cover split structure is eliminated. Precisely because the shell 1 and the rear end cover 9 are integrally formed, conventional glue injection methods cannot be applied in this embodiment. Therefore, glue injection holes 101 are set on the side walls of the top wall of the shell 1, and glue is injected from the side of the shell 1. The axial glue injection channel 4 formed between the shell 1 and the stator winding 2 can well mold the colloid in the shell 1. In this embodiment, more than two glue injection holes 101 can be set on the side wall of the shell 1 to improve the glue injection efficiency.

[0063] Specifically, Figure 8 and Fig. 9 It can be concluded from the magnetic force line distribution diagram and idling friction torque diagram of the conventional galvanometer motor without glue injection hole 101 that most of the magnetic force lines tend to enter the shell 1 first along the direction from the N pole to the S pole inside the magnetic steel 8, and then, according to the principle that the magnetic flux is always closed along the path with the minimum magnetic resistance, the magnetic force lines form two closed magnetic circuits on the left and right inside the shell 1. This embodiment cannot only set multiple glue guide holes 7 on the first ring body 3 and the second ring body 6. There are actually multiple glue injection holes 11 between the radial positions of the shell 1 and the stator winding 2. That is to say, the glue guide holes 7 and the glue injection holes 101 of this embodiment have an impact on the direction of the magnetic force lines. The glue guide holes 7 have an impact on the direction of the magnetic force lines, but the glue guide holes 7 have a limited impact on the magnetic force lines and the friction torque. The thickness of the shell 1 has a great impact on the magnetic force lines, and the corresponding glue injection holes 101 set on the shell 1 also have a great impact. If the glue injection holes 101 are located in the middle position of the corresponding magnetic steel 8 in the axial direction, the distribution of the magnetic force lines will change significantly.

[0064] In this embodiment, Fig.10It can be clearly observed that after the magnetic lines of force pass through the stator winding 2 and the cured glue layer 5, they do not directly enter the inner shell along the direction from the N pole to the S pole inside the magnetic steel 8, but preferentially choose the path avoiding the injection hole 101, that is, entering the inner shell from the inner shell material around the injection hole 101. This phenomenon is mainly caused by the "non-uniformity of the magnetic circuit material". Specifically, due to the thick wall thickness of the shell 1, after the inner wall of the shell 1 of the magnetic conductive material is dug, there is an air gap at the injection hole 101. The magnetic resistance of the air gap area is close to the vacuum magnetic resistance. Therefore, the magnetic lines of force will preferentially avoid the area with large magnetic resistance and enter the inner shell. Subsequently, the magnetic circuit will bend greatly at the injection hole 101. The magnetic lines of force will go from both sides of the injection hole. The path of the magnetic lines of force is not uniform, the turning is not smooth and incoherent. The magnetic lines of force correspond to the magnetic force. The shaft 11 is also suddenly subjected to a magnetic force fluctuation under the action of the magnetic field, which ultimately reflects the unstable and fluctuating friction torque. According to the principle of electromechanics, this phenomenon causes the motor's no-load friction torque to fluctuate, such as Fig.11 As shown, the fluctuation of the motor friction torque will cause the positioning accuracy of the galvanometer system to deteriorate. Therefore, the glue injection hole 101 in this embodiment should also avoid the axial middle position of the magnetic steel 8, so as to avoid the main magnetic field area. In this embodiment, the glue injection hole 101 is set on the axial outside of the magnetic steel 8, that is, the glue injection hole 101 does not overlap with the magnetic steel 8 in the radial direction. In this way, the main magnetic field area of ​​the magnetic steel 8 can be avoided, and the influence on the direction of the magnetic lines of force can be reduced. Through this structural optimization, the influence of the glue injection hole 101 on the magnetic circuit can be greatly reduced. In addition, it should be noted that the number of glue injection holes 101 is not limited and can be adjusted according to actual needs.

[0065] See also Figure 7 As shown, the radius of the inner wall of the housing 1 is R, the radial thickness of the axial glue injection channel 4 is H, and the ratio of the radius R to the thickness H satisfies: 0.2≤H / R≤0.5.

[0066] Specifically, the inner wall radius R of the shell 1 here refers to the inner wall of the shell 1 where the ring body is not set, specifically the distance from the inner wall to the central axis of the shell 1. The thickness H of the axial glue injection channel 4 is not the larger the better. According to the principles of electrical engineering, the sum of the thickness H of the axial glue injection channel 4 and the inner diameter of the shell 1 where the ring body is set jointly determine the magnitude of the motor magnetic resistance. The larger the sum of the two, the greater the motor magnetic resistance. The increase in the motor magnetic resistance will lead to a decrease in the motor efficiency. In order to take into account both the glue injection efficiency and the motor efficiency, the thickness H of the axial glue injection channel 4 needs to be set within a reasonable numerical range. It has been verified that the relationship between the H / R ratio and the motor efficiency is as follows: Fig.12 As shown in the figure, when 0.2≤H / R≤0.5, the motor operation efficiency and injection efficiency are both high.

[0067] It is worth mentioning that the colloid is epoxy resin. The first ring body 3 and the second ring body 6 of this embodiment are both annular. In other embodiments, a plurality of spaced-apart protrusions are arranged on the circumference of the inner wall of the shell 1. The protrusions can abut against the stator winding 2. The protrusions also form an axial glue injection channel 4 between the stator winding 2 and the shell 1.

[0068] See also Figure 7 As shown, a motor includes a casing assembly, and the casing assembly is the casing assembly mentioned above.

[0069] Specifically, the motor is a galvanometer motor, and the rear end cover 9 and the housing 1 are integrally formed. Fig.13 As shown, the no-load friction torque ratio Tb of the galvanometer motor in this embodiment is about 35% lower than the no-load friction torque Ta of the traditional galvanometer motor. Therefore, the galvanometer motor in this embodiment greatly reduces the influence of the coaxiality error on the accuracy of the galvanometer system, improves the service life of the front and rear bearings, and at the same time makes the galvanometer motor more precise in controlling the light beam.

[0070] See also Figure 4 and Figure 5 As shown, a method for assembling a housing assembly is used to assemble the above-mentioned housing assembly, wherein the housing 1 and the rear end cover 9 are integrally formed, and the assembly method comprises the following steps:

[0071] S1: Assembling the housing assembly with the assembly tool 10;

[0072] Specifically, the stator winding 2 is first placed vertically into the assembly tool 10, with the end of the shell 1 connected to the rear end cover 9 placed upward, the glue injection hole 101 is set at the top of the shell 1, and the other end of the shell 1 is an open structure. Then the assembly tool 10 and the stator winding 2 are pushed into the shell 1 from the open part, and the stator winding 2 is abutted against the first ring body 3.

[0073] S2: Colloid is poured into the glue injection hole 101 , and the colloid flows into the axial glue injection channel 4 . After the colloid is solidified, the assembly of the housing 1 and the stator winding 2 is completed.

[0074] In this embodiment, compared with the conventional method of inserting the stator winding 2 after injecting glue into the housing 1, since the housing 1 and the rear end cover 9 are integrally formed in this embodiment, the conventional injection method cannot be applied. In this embodiment, the stator winding 2 is first pushed into the housing 1 and then injected with glue. In this way, the colloid can be fully filled into the copper wire gap of the stator winding 2. By first pushing the stator winding 2 and then injecting glue, the colloid can be more fully filled into the copper wire gap of the stator winding 2, thereby improving the filling efficiency of the colloid. In addition, due to the presence of the axial injection flow channel 4, the epoxy resin is allowed to flow evenly along the length direction of the stator winding 2, ensuring that each part of the winding can be fully filled with the colloid, thereby improving the uniformity of the filling. Through the axial injection flow channel 4, the colloid can more effectively replace the air around the winding, thereby reducing the formation of bubbles and gaps. The axial glue injection channel 4 helps the colloid to form a uniform glue layer 5 around the stator winding 2, which is equivalent to filling an additional glue layer 5 on the radial outer side of the stator winding 2, so that the colloid can be more evenly distributed around the stator winding 2, thereby improving the thermal conductivity uniformity of the stator, which is conducive to the stable operation and life extension of the motor. After the colloid in the axial glue injection channel 4 is cured, the mechanical connection between the stator winding 2 and the housing 1 can be enhanced, and the stability and durability of the entire motor stator can be improved. The axial glue injection channel provides a flow path for the colloid. By accurately controlling the injection path and amount, the axial glue injection channel 4 helps to reduce the waste of the colloid and improve the utilization rate of the material.

[0075] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A housing assembly, characterized in that: include: A housing (1) and a stator winding (2); A first ring body (3) is arranged on the inner wall of the shell (1), and the first ring body (3) is arranged protrudingly along the radial direction of the shell (1). In the axial direction of the shell (1), the stator winding (2) is installed in the shell (1), and the stator winding (2) is connected to the first ring body (3), so that an axial glue injection flow channel (4) is formed between the shell (1) and the stator winding (2); The shell (1) is provided with a glue injection hole (101), the glue injection hole (101) being in communication with the axial glue injection channel (4), and the glue injection hole (101) being used for flowing glue so that the glue is injected into the axial glue injection channel (4) to form a glue layer (5).

2. The housing assembly according to claim 1, characterized in that: A second ring body (6) is also provided on the inner wall of the shell (1), the second ring body (6) being provided protrudingly in the radial direction of the shell (1), and the stator winding (2) is connected to the second ring body (6).

3. The housing assembly according to claim 2, characterized in that: A plurality of glue guide holes (7) are respectively arranged along the circumference of the first ring body (3) and / or the second ring body (6), the glue guide holes (7) penetrating the corresponding ring body along the axial direction of the shell (1), and the glue guide holes (7) are connected to the axial glue injection channel (4).

4. The housing assembly according to claim 2, characterized in that: One end of the stator winding (2) abuts against the first ring body (3), and the other end of the stator winding (2) abuts against the second ring body (6).

5. The housing assembly according to claim 1, wherein: It also comprises a rotating shaft (11), the rotating shaft (11) being inserted into the housing (1), the rotating shaft (11) being provided with a magnetic steel (8), the magnetic steel (8) being inserted into the stator winding (2), and the first ring body (3) being located radially outside the end of the magnetic steel (8).

6. The housing assembly according to claim 5, characterized in that: It also comprises a rear end cover (9), the rear end cover (9) and the shell (1) are integrally formed, the glue injection hole (101) is arranged close to the rear end cover (9), and the glue injection hole (101) is located axially outside the magnetic steel (8).

7. The housing assembly according to any one of claims 1 to 6, characterized in that: The radius of the inner circumferential wall of the shell (1) is R, the radial thickness of the axial glue injection channel (4) is H, and the ratio of the radius R to the thickness H satisfies: 0.2≤H / R≤0.

5.

8. A motor, comprising a housing assembly, characterized in that: The housing assembly is the housing assembly according to any one of claims 1 to 7.

9. A method for assembling a housing assembly, characterized in that: Used for assembling a housing assembly according to any one of claims 1 to 7, the housing (1) and the rear end cover (9) are integrally formed, and the assembly method comprises the following steps: Assembling the housing assembly with an assembly tool (10); Glue is poured into the glue injection hole (101), and the colloid flows into the axial glue injection channel (4). After the colloid is solidified, the assembly of the housing (1) and the stator winding (2) is completed.

10. The method for assembling a housing assembly according to claim 9, characterized in that: The assembly of the housing assembly and the assembly tool (10) comprises: First, the stator winding (2) is vertically mounted on the assembly tool (10), with the end of the housing (1) connected to the rear end cover (9) placed upward, and the other end of the housing (1) being an open structure. Then, the assembly tool (10) and the stator winding (2) are pushed together from the open structure into the housing (1), and the stator winding (2) abuts against the first ring body (3).

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