Stator assembly and servo motor

Abstract

The utility model provides a kind of stator assembly and servo motor.The stator assembly includes: motor stator (10), including stator core and stator winding;Circuit board (11) is electrically connected with motor stator (10);Power cord (12) is electrically connected with circuit board (11);BMC injection molding material (13) is injection molded in the outer end of motor stator (10), circuit board (11) and power cord (12) and circuit board (11) connection, and motor stator (10), circuit board (11) and power cord (12) are injection molded into one body.According to the stator assembly of the utility model, the heat dissipation effect of motor can be ensured while the axial length of motor is shortened.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a stator assembly and a servo motor. Background Technology

[0002] As a key component in modern industrial automation and precision control, servo motors have become an indispensable choice in various high-precision applications due to their superior performance—high precision, fast response, and excellent operational stability. From precise positioning and motion control on factory production lines to the precision operation of aerospace equipment, to assisting in delicate surgical procedures in medical equipment and intelligent driving in smart homes, servo motors are ubiquitous, playing a crucial role as core executors. With the rapid development of technology and the continuous upgrading of market demands, servo motors are not only required to be more efficient and reliable in traditional fields, but also need to expand into emerging fields such as wearable devices and microrobots. This places higher demands on the miniaturization, lightweighting, and precision of the motors.

[0003] As robotics technology advances towards higher performance and smaller size, servo motor design faces unprecedented challenges. This is especially true for robot joints, where extremely tight space constraints require servo motors to not only provide powerful output but also possess high integration and lightweight characteristics to ensure the robot's flexibility and load-bearing capacity.

[0004] When the axial length of a motor is shortened, the heat dissipation channel area between the stator and rotor decreases, directly leading to increased thermal resistance—that is, greater resistance to heat transfer from the heat source to the cooling medium. Heat dissipation capacity, as one of the three core performance indicators for servo motors (power density, efficiency, and heat dissipation capacity), is of paramount importance. During motor operation, current flowing through the windings generates heat, i.e., copper losses; furthermore, magnets are prone to demagnetization at high temperatures, reducing the motor's magnetic field strength and driving force. These factors all contribute to decreased motor efficiency, especially in industrial robots that require frequent starts and stops and undergo high acceleration and deceleration. Insufficient heat dissipation causing temperature rise will severely affect the motor's response speed and positioning accuracy, thereby threatening the stable operation and operational accuracy of the entire robot. Utility Model Content

[0005] The main objective of this invention is to provide a stator assembly and a servo motor that can shorten the axial length of the motor while ensuring its heat dissipation.

[0006] To achieve the above objectives, according to one aspect of the present invention, a stator assembly is provided, comprising:

[0007] The motor stator includes the stator core and the stator windings;

[0008] The circuit board is electrically connected to the motor stator.

[0009] The power cord is electrically connected to the circuit board.

[0010] BMC injection molding involves injection molding the motor stator, circuit board, and power cord onto the outside of the connection point between the stator and circuit board, thus integrating the motor stator, circuit board, and power cord into a single unit.

[0011] Furthermore, the circuit board includes a connecting plate protruding from the outer periphery of the motor stator, the power cord is connected to the connecting plate, and the portion of the connecting plate near the outer periphery of the motor stator has a wire-passing groove on at least one side in the circumferential direction, and the branch cables of the power cord are disposed in the wire-passing groove.

[0012] Furthermore, BMC injection molding forms a first stop at the front end of the motor stator and a second stop at the rear end of the motor stator.

[0013] Furthermore, on the soldering side of the circuit board, the height of the BMC injection molding compound on the soldering side of the circuit board is greater than or equal to 2mm.

[0014] According to another aspect of the present invention, a servo motor is provided, including a stator assembly, which is the stator assembly described above.

[0015] Furthermore, the servo motor also includes a front cover, a middle cover, a rear cover, and a brake assembly. The front cover is located at the front end of the stator assembly, the middle cover is located at the rear end of the stator assembly, the rear cover is located on the middle cover and forms an installation space between the rear cover and the middle cover, and the brake assembly is assembled within the installation space.

[0016] Furthermore, the portion of the connecting plate near the outer periphery of the motor stator has a wire groove on at least one side in the circumferential direction. When the branch cable of the power line is placed in the wire groove, a wire hole is provided on the middle end cover. The branch cable is electrically connected to the brake assembly through the wire groove and the wire hole.

[0017] Furthermore, when BMC injection molding forms a first stop at the front end of the motor stator and a second stop at the rear end of the motor stator, the front end cover includes an end plate and a housing. The housing is provided with a stop step. The housing is fitted outside the stator assembly. The stop step and the first stop form a stop engagement. The middle end cover and the second stop form a stop engagement.

[0018] Furthermore, the servo motor also includes screws, which pass through the rear end cover, the middle end cover, and the BMC injection molding compound in sequence before being fixedly connected to the front end cover.

[0019] Furthermore, the servo motor also includes an encoder assembly and an encoder cover, with the encoder cover mounted on the rear cover and the encoder assembly disposed inside the encoder cover.

[0020] By applying the technical solution of this utility model, the motor structure has been optimized. The high degree of freedom in the shape of BMC injection molded parts is used to replace epoxy resin to wrap the stator, coil windings and circuit board. At the same time, part of the housing structure is injection molded to replace part of the front cover housing and power cord outlet box. The compact design shortens the overall length and reduces the overall cost. In addition, the good heat dissipation of BMC solves the problem of poor heat dissipation caused by the compact design of the motor. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of the servo motor according to an embodiment of the present invention is shown;

[0023] Figure 2 A cross-sectional view of a stator assembly according to an embodiment of the present invention is shown.

[0024] Figure 3 A three-dimensional structural diagram of the stator assembly before injection molding according to an embodiment of the present invention is shown;

[0025] Figure 4 A three-dimensional structural diagram of the stator assembly after injection molding according to an embodiment of the present invention is shown;

[0026] Figure 5 A three-dimensional structural schematic diagram of the middle end cap according to an embodiment of the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 1. Front end cover; 2. Stator assembly; 3. Rotor assembly; 4. Middle end cover; 5. Brake assembly; 6. Brake cable outlet cover; 7. Rear end cover; 8. Encoder assembly; 9. Encoder cover; 10. Motor stator; 11. Circuit board; 12. Power cord; 13. BMC injection molding compound; 14. Annular protrusion; 15. First stop; 16. Second stop; 17. Branch cable; 18. Wire groove; 19. Wire hole; 20. Connecting plate; 21. End plate; 22. Housing; 23. Stop step. Detailed Implementation

[0029] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] See also Figures 1 to 5As shown, according to an embodiment of the present invention, the stator assembly includes: a motor stator 10, including a stator core and a stator winding; a circuit board 11, electrically connected to the motor stator 10; a power cord 12, electrically connected to the circuit board 11; and a BMC injection molding compound 13, which is injection molded onto the motor stator 10, the circuit board 11, and the power cord 12 at the end connected to the circuit board 11, thereby molding the motor stator 10, the circuit board 11, and the power cord 12 into one piece.

[0031] Bulk Molding Compound (BMC) is a thermosetting composite material commonly used in injection molding. BMC materials consist of resin, glass fiber, fillers such as spherical alumina, release agents, curing agents, and pigments, the proportions of which can be adjusted to meet different performance requirements.

[0032] The stator assembly integrates the motor stator 10, circuit board 11, and power line 12, and encapsulates them in one piece using BMC injection molding 13, achieving multiple benefits such as compact structure, enhanced heat dissipation, and reduced cost. These benefits stem from the intricate interaction between the components and the unique physical properties of the BMC material.

[0033] By integrating the motor stator 10, circuit board 11, and power cord 12 into a single package, air gaps or other discontinuous interfaces between components in traditional designs are eliminated. Furthermore, the use of BMC injection molding to encapsulate the circuit board and power cord eliminates the need for a power cord junction box, significantly reducing thermal resistance, improving heat conduction efficiency, and lowering costs. BMC injection molding, with its excellent flowability and filling capacity, can seamlessly fill the tiny gaps between components, forming a continuous heat conduction path. This allows the heat generated by the motor stator to be rapidly transferred to the circuit board and even the power cord, ultimately dissipating into the motor housing or ambient air, preventing localized heat accumulation and enhancing heat dissipation.

[0034] The combination of high thermal conductivity and insulation properties of BMC (biologically modified silica) provides an ideal thermal management solution for motors. On one hand, BMC containing spherical alumina filler significantly improves the material's thermal conductivity, reaching 1.6~1.9 W / m·K, which is far higher than that of ordinary epoxy resins, helping to accelerate heat transfer. On the other hand, the insulating properties of BMC mean that even under high thermal conductivity, it can effectively isolate the electrical contact between the power lines and the motor stator, ensuring the motor's electrical safety. This material selection addresses the dual needs of motor heat dissipation and electrical safety, making it key to achieving high performance and high reliability in motors.

[0035] The adoption of BMC injection molding instead of traditional epoxy resin casting is not only due to the performance advantages of BMC, but also because of its significant cost savings in manufacturing. As a thermosetting composite material, BMC raw material costs are reduced by 20% to 30% compared to epoxy resin. Combined with the high efficiency and low energy consumption of the injection molding process itself, energy consumption is reduced by 30% to 70%. This significantly lowers the overall manufacturing cost of servo motors, facilitating the market promotion and large-scale application of the product.

[0036] By integrating the stator components and applying BMC injection molding technology, the heat dissipation problem caused by the miniaturization of servo motors has been overcome. Furthermore, by optimizing materials and processes, a significant cost reduction has been achieved, providing strong support for improving the response speed, positioning accuracy, overall electrical safety, and economic benefits of robot joints.

[0037] This embodiment optimizes the motor structure by utilizing the high degree of freedom in the shape of BMC injection molded parts to replace epoxy resin, wrapping the stator, coil windings, and circuit board. At the same time, part of the housing structure is injection molded to replace part of the front cover housing and power cord outlet box. The compact design shortens the overall length and reduces the overall cost. Furthermore, the excellent heat dissipation of BMC solves the problem of poor heat dissipation caused by the compact design of the motor.

[0038] In one embodiment, the circuit board 11 includes a connecting plate 20 protruding from the outer periphery of the motor stator 10, a power line 12 connected to the connecting plate 20, and a wire groove 18 formed on at least one side of the connecting plate 20 near the outer periphery of the motor stator 10 in the circumferential direction, and a branch cable 17 of the power line 12 is disposed in the wire groove 18.

[0039] The connecting plate 20 designed on the circuit board 11 is connected to the outer periphery of the motor stator 10. It not only achieves efficient connection of the power line 12 in terms of structure, but also provides an optimized solution for the layout of the branch cable 17 through the design of its cable groove 18. This has a significant effect on improving heat dissipation efficiency, reducing electrical risks and simplifying the assembly process.

[0040] Because the power cord 12 is directly connected to the protruding connecting plate 20, the winding of the power cord 12 inside the motor is reduced, and direct contact between the power cord 12 and the heat-generating components of the motor is avoided, thereby reducing the additional thermal resistance caused by the power cord 12. The connecting plate 20 is located on the outer periphery of the motor stator 10, allowing the heat at the connection point between the power cord 12 and the connecting plate 20 to be directly dissipated through the externally wrapped BMC injection molding compound, without passing through the motor stator. This helps to quickly dissipate the heat generated at the connection point of the power cord 12 to the outside, reducing the heat dissipation path and improving overall heat dissipation efficiency.

[0041] The design of the cable tray 18 solves the problem of reasonable wiring of the branch cable 17 inside the motor, achieving effective isolation and protection of the cable. The cable tray 18 is located on the connecting plate 20 near the outer periphery of the stator, guiding the branch cable 17 along the tray into the inner side of the motor stator 10, facilitating subsequent connection of the branch cable 17 to other components. Simultaneously, the branch cable 17 is fixed within the cable tray 18, eliminating the need to bypass the connecting plate 20, which further reduces the length of the branch cable 17, resulting in a more compact overall structure.

[0042] By pre-designing the connecting plate 20 and the cable tray 18 on the circuit board 11, the need for separate installation of cable clamps or cable protection devices is reduced, making the assembly process more efficient. Cables can be directly arranged in the cable tray 18 without additional positioning or fixing steps, saving assembly time and improving assembly efficiency.

[0043] In this embodiment, a rectangular area protrudes from the circuit board 11, forming a rectangular connecting plate 20. The connecting plate 20 narrows inward on both sides at its bottom to allow the branch cable 17 of the power line 12, which connects to the integrated brake assembly 5, to pass through. The U, V, and W soldering holes are located on the connecting plate 20 of the circuit board 11. The circuit board 11 is soldered to the pins at the rear end of the motor stator 10, forming solder joints at the pins, which are then encased in BMC injection molding compound 13. The three cables of the power line 12, namely the U, V, and W lines, are soldered to the U, V, and W holes of the connecting plate 20 on the protruding part of the circuit board 11, respectively. The branch cable 17 of the power line 12, which connects to the integrated brake assembly 5, extends into the interior of the motor stator 10 through the wire passage groove 18 formed by the narrower areas on both sides of the connecting plate 20 on the protruding part of the circuit board 11.

[0044] In one embodiment, the BMC injection molding compound 13 forms a first stop 15 at the front end of the motor stator 10 and a second stop 16 at the rear end of the motor stator 10.

[0045] The formation of the stop structure significantly improves the assembly accuracy and firmness between motor components. The transition fit between the first stop 15 and the front end cover 1, and the second stop 16 and the middle end cover 4, ensures the precise alignment of each motor component in the axial and radial directions through the precise docking of the front and rear stops, reducing the accumulation of errors during the assembly process. This not only improves the overall stability and lifespan of the motor, but also simplifies the assembly process and reduces the requirements for assembly equipment and operational precision.

[0046] The tight fit of the sealing structure, combined with appropriate sealing materials such as adhesives, effectively isolates the motor's internal components from environmental factors such as dust and humidity. This is especially crucial under the harsh working conditions of industrial robots, which involve frequent starts and stops and high acceleration and deceleration. Good sealing protects the motor from damage and extends its service life. Furthermore, improved sealing also enhances the motor's waterproof and dustproof rating, making it suitable for a wider range of applications.

[0047] The use of the stop structure also optimizes the heat dissipation path of the motor. BMC injection molding compound not only has superior thermal conductivity compared to epoxy resin, but the stop structure it forms also acts as a continuous heat-conducting surface, accelerating the transfer of heat from the motor stator to the housing and avoiding the increased thermal resistance caused by gaps in traditional assembly methods. In particular, the first stop 15 and the second stop 16 formed at the front and rear ends of the motor stator 10, through their tight fit with the corresponding end caps, ensure that heat can be efficiently dissipated along the stop direction, enhancing the overall heat dissipation capacity of the motor and reducing the risk of motor performance degradation due to heat accumulation.

[0048] The stop formed by BMC injection molding replaces additional mechanical or sealing components, reducing material consumption and subsequent processing steps. At the same time, the high efficiency and low energy consumption of injection molding directly reduce manufacturing costs, enabling the entire motor assembly to maintain high performance while achieving effective cost control.

[0049] In one embodiment, on the soldering side of the circuit board 11, the height of the BMC injection molding compound 13 on the soldering side of the circuit board 11 is greater than or equal to 2 mm.

[0050] The specific height design of the BMC injection molding compound 13 on the welding side ensures sufficient insulation distance to prevent accidental contact between the solder joint and the external environment, greatly reducing the risk of short circuits and thus improving the overall safety performance of the motor. This design is particularly important for servo motors, as they are often used in high-voltage, high-frequency industrial environments where any electrical fault can lead to serious consequences. Furthermore, the BMC injection molding compound 13 also provides necessary mechanical protection to prevent damage to the solder joint under motor operation or external pressure, enhancing the stability and durability of the solder joint.

[0051] The BMC injection molding compound covers the soldering side. Due to its excellent thermal conductivity, it can effectively conduct the heat generated on the solder joints and circuit board 11 to the motor housing or cooling medium. By controlling the height of the injection molding compound, a layered structure is formed that both protects the solder joints and promotes heat dissipation. The height of 2mm or more provides sufficient safety distance to effectively prevent exposed solder joints and poor pressure resistance. At the same time, the close contact with the circuit board ensures rapid heat transfer, achieving efficient thermal management.

[0052] BMC injection molding uses a one-step injection molding process, eliminating the need for additional processing of the circuit board or the addition of heat insulation materials in traditional methods, thus simplifying the production process. The set minimum height requirement ensures that electrical safety and heat dissipation requirements are met while avoiding unnecessary material waste, achieving cost control.

[0053] According to an embodiment of the present invention, the servo motor includes a stator assembly 2, which is the stator assembly described above.

[0054] By adopting the stator assembly 2 described above, the servo motor can effectively promote rapid heat dissipation during motor operation by utilizing the characteristics of BMC injection molding plastic, enhance the protection of electrical components, simplify the assembly process, and significantly improve the motor's response speed, positioning accuracy, and overall reliability, achieving a perfect balance between high performance and low cost.

[0055] In one embodiment, the servo motor further includes a front cover 1, a middle cover 4, a rear cover 7, and a brake assembly 5. The front cover 1 is disposed at the front end of the stator assembly 2, the middle cover 4 is disposed at the rear end of the stator assembly 2, the rear cover 7 is disposed on the middle cover 4 and forms an installation space between the rear cover 7 and the middle cover 4, and the brake assembly 5 is assembled in the installation space.

[0056] The tight fit between the front cover 1 and the stator assembly 2, and the placement of the middle cover 4 at the rear end of the stator assembly 2, form a stable frame structure, ensuring the mechanical stability of the motor at high speeds, reducing vibration during motor start-up and stop, improving the response speed and stability of the servo motor, and thus enhancing positioning accuracy.

[0057] The brake assembly 5 is positioned within the space formed by the middle end cover 4 and the rear end cover 7, and is mounted on the rear end cover 7, saving additional space and making the overall structure of the motor more compact and maximizing space utilization. The integrated design of the brake assembly 5 also reduces the axial length of the motor and optimizes the motor's heat dissipation path. The tight fit between the front end cover 1 and the stator assembly 2, as well as the reasonable spacing between the middle end cover 4 and the rear end cover, supports the heat dissipation of the BMC injection molding compound 13, ensuring that the motor maintains good thermal performance under high load conditions.

[0058] In this embodiment, a brake cable outlet box 6 is provided on the outer periphery of the brake assembly 5. The cable of the brake assembly 5 is welded to the branch cable 17 of the power cable 12, wrapped in heat shrink tubing, and placed in the brake cable outlet box 6. By providing the brake cable outlet box 6 on the outer periphery of the brake assembly 5, the axial space of the motor can be saved, and space can be provided for the cable arrangement. Excess cable can be tightened by heat shrink tubing and placed in the brake cable outlet box 6 as a whole. The wiring is more reasonable and can effectively prevent long cables from entering the operating space of the brake assembly 5 and interfering with the braking of the brake assembly 5, thereby improving the stability and reliability of the brake assembly 5 during operation.

[0059] In one embodiment, the portion of the connecting plate 20 near the outer periphery of the motor stator 10 has a wire groove 18 on at least one side in the circumferential direction. When the branch cable 17 of the power line 12 is placed in the wire groove 18, a through hole 19 is provided on the middle end cover 4. The branch cable 17 is electrically connected to the brake assembly 5 through the wire groove 18 and the through hole 19.

[0060] The design of the cable tray 18 and the through hole 19 significantly improves the safety and reliability of electrical connections, making the cable arrangement more rational. The branch cable 17 runs along the cable tray 18 of the circuit board 11, and then connects to the brake assembly 5 through the through hole 19 on the end cover 4, avoiding arbitrary drifting and friction of the cable inside the motor and reducing the risk of electrical interference and insulation damage. The guidance of the cable tray 18 and the through hole 19 ensures an orderly layout of the cable in a limited space, enhances cable protection, and maintains stable electrical performance even in extreme environments with frequent start-stop and high acceleration / deceleration of the servo motor.

[0061] The cable pass-through hole 19 on the middle end cover 4 enables seamless connection between the electrical components and the brake assembly 5, improving the functional integration and assembly precision of the servo motor. The cable pass-through hole 19 ensures the smooth passage of cables, enabling a reliable connection between the branch cable 17 and the brake assembly 5. At the same time, the cooperation between the cable pass-through hole 19 and the cable tray 18 forms an electrical channel that protects the cables and facilitates assembly, reducing assembly problems caused by improper cable layout, such as cable compression and short circuits, thereby enhancing the overall stability and service life of the motor.

[0062] In one embodiment, the thread hole 19 is a fan-shaped hole that passes through the middle end cap 4 axially.

[0063] The wire hole 19 can also be other shapes, depending on the need to facilitate the routing of branch cables 17.

[0064] In one embodiment, when the BMC injection molding 13 forms a first stop 15 at the front end of the motor stator 10 and a second stop 16 at the rear end of the motor stator 10, the front end cover 1 includes an end plate 21 and a housing 22. The housing 22 is provided with a stop step 23. The housing 22 is sleeved on the stator assembly 2. The stop step 23 and the first stop 15 form a stop engagement. The middle end cover 4 and the second stop 16 form a stop engagement.

[0065] By forming a first stop 15 and a second stop 16 at the front and rear ends of the motor stator 10 using BMC injection molding 13, and combining the stop step 23 on the housing 22 of the front end cover and the stop of the annular protrusion 14 on the middle end cover 4, a stable mechanical frame is constructed. This not only ensures precise axial positioning and sealing between the various components of the motor, but also optimizes the heat conduction path, achieving stability and efficient heat dissipation of the motor during high-speed operation, thereby improving the overall performance and reliability of the servo motor.

[0066] In one embodiment, the servo motor further includes screws that pass sequentially through the rear end cover 7, the middle end cover 4, and the BMC injection molding compound 13 before being fixedly connected to the front end cover 1.

[0067] The servo motor is fixedly connected to the front cover 1 by screws that penetrate the rear cover 7, the middle cover 4, and the BMC injection molding 13 in sequence. This ensures a firm connection and precise alignment between the motor components, effectively enhancing the mechanical strength and stability of the motor. At the same time, the process of screws penetrating the BMC injection molding 13 optimizes the heat conduction path, promotes efficient heat dissipation during motor operation, and improves the response speed and positioning accuracy of the servo motor in dynamic motion.

[0068] The injection-molded stator assembly, such as Figure 4 As shown, the surface is smooth and flat, with no plastic flowing into the inner circle of the stator. BMC injection molding compound 13 is used to replace the power cord outlet box and part of the aluminum housing. After injection molding, the precision of the BMC injection molding stop is adjusted through post-processing. It transitions with the front end cover 1 and the middle end cover 4 through the front and rear stops, and glue is applied to ensure a seal. Evenly distributed transverse through-holes are made on the BMC injection molding compound 13 housing for inserting mounting screws. The screws are inserted through the rear end cover 7, the middle end cover 4, and the BMC injection molding compound 13, and then screwed into the front end cover 1, thus connecting and fixing the stator assembly.

[0069] In one embodiment, the servo motor further includes an encoder assembly 8 and an encoder cover 9, the encoder cover 9 being mounted on the rear cover 7, and the encoder assembly 8 being disposed inside the encoder cover 9.

[0070] The encoder assembly 8 integrated into the servo motor is placed inside the encoder cover 9 and installed on the rear cover 7, which ensures accurate data acquisition and transmission of the encoder during the high-speed rotation of the motor, strengthens the position feedback mechanism of the motor, and greatly improves the positioning accuracy and dynamic response speed of the servo motor.

[0071] The servo motor also includes a rotor assembly 3, which is housed within the stator assembly 2.

[0072] The assembly process of the servo motor in this embodiment is as follows:

[0073] The front cover 1, using specialized heat-fitting fixtures, is tightly connected to the stator assembly 2 via an interference fit, ensuring a gapless and secure bond between the two. This lays the foundation for the axial and radial positioning of the motor stator 10. A wave-shaped elastic washer is placed in the bearing housing of the front cover 1, and an appropriate preload is applied. Bearing adhesive is then applied, enhancing the stability of the axial assembly and creating conditions for the precise alignment and pressing in of the rotor assembly 3. The rotor assembly 3 is securely pressed into place from the rear end of the stator assembly 2 using alignment fixtures, ensuring alignment of the motor's rotation center and improving operational smoothness and efficiency.

[0074] The intermediate end cover 4 is installed from the rear end of the rotor assembly 3. The bearing chamber of the intermediate end cover 4 is pre-applied with bearing adhesive to enhance the adhesion and sealing between the components. The intermediate end cover 4 and the stator assembly 2 are fitted with a stop joint, which not only ensures the compactness of the motor's axial length but also allows the branch cable 17 of the power line 12 to be pulled out from the fan-shaped cable hole 19, ensuring smooth and unobstructed electrical connection. The brake assembly 5 is fixed to the rear end cover 7 with screws. The rear end cover 7 is fitted with the intermediate end cover 4 with a stop joint, achieving precision and strength in the connection between the motor components. The cable of the brake assembly 5 is welded to the branch cable 17 of the power line 12 and wrapped in heat shrink tubing before being placed in the brake outlet box 6, improving electrical safety and ease of maintenance.

[0075] The encoder assembly 8 is fixed to the rear end cover 7 and the rotor assembly 3 with screws, and establishes an electrical connection with the socket on the encoder cover 9, realizing the key function of precise motor position feedback. An O-ring is embedded in the groove of the rear end cover 7 to enhance the sealing effect between the rear end cover 7 and the encoder cover 9. Then the encoder cover 9 is assembled to complete the assembly of the whole machine.

[0076] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0077] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0078] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stator assembly, characterized in that, include: The motor stator (10) includes a stator core and stator windings; Circuit board (11) is electrically connected to the motor stator (10); The power cord (12) is electrically connected to the circuit board (11); BMC injection molding (13) injection molding the motor stator (10), the circuit board (11) and the power line (12) at the end connected to the circuit board (11) to form a single unit.

2. The stator assembly according to claim 1, characterized in that, The circuit board (11) includes a connecting plate (20) protruding from the outer periphery of the motor stator (10), the power line (12) is connected to the connecting plate (20), and the portion of the connecting plate (20) near the outer periphery of the motor stator (10) has a wire groove (18) on at least one side in the circumferential direction, and the branch cable (17) of the power line (12) is disposed in the wire groove (18).

3. The stator assembly according to claim 1, characterized in that, The BMC injection molding compound (13) forms a first stop (15) at the front end of the motor stator (10) and a second stop (16) at the rear end of the motor stator (10).

4. The stator assembly according to claim 1, characterized in that, On the soldering side of the circuit board (11), the height of the BMC injection molding compound (13) on the soldering side of the circuit board (11) is greater than or equal to 2 mm.

5. A servo motor, comprising a stator assembly (2), characterized in that, The stator assembly (2) is the stator assembly according to any one of claims 1 to 4.

6. The servo motor according to claim 5, characterized in that, The servo motor also includes a front cover (1), a middle cover (4), a rear cover (7), and a brake assembly (5). The front cover (1) is disposed at the front end of the stator assembly (2), the middle cover (4) is disposed at the rear end of the stator assembly (2), the rear cover (7) is disposed on the middle cover (4) and forms an installation space with the middle cover (4), and the brake assembly (5) is assembled in the installation space.

7. The servo motor according to claim 6, characterized in that, The circuit board (11) includes a connecting plate (20) protruding from the outer periphery of the motor stator (10). The portion of the connecting plate (20) near the outer periphery of the motor stator (10) has a wire groove (18) on at least one side in the circumferential direction. When the branch cable (17) of the power line (12) is placed in the wire groove (18), a through hole (19) is provided on the middle end cover (4). The branch cable (17) is electrically connected to the brake assembly (5) through the wire groove (18) and the through hole (19).

8. The servo motor according to claim 6, characterized in that, When the BMC injection molding material (13) forms a first stop (15) at the front end of the motor stator (10) and a second stop (16) at the rear end of the motor stator (10), the front end cover (1) includes an end plate (21) and a housing (22). A stop step (23) is provided on the housing (22). The housing (22) is sleeved on the stator assembly (2). The stop step (23) and the first stop (15) form a stop fit. The middle end cover (4) and the second stop (16) form a stop fit.

9. The servo motor according to claim 6, characterized in that, The servo motor also includes screws, which pass through the rear end cover (7), the middle end cover (4), and the BMC injection molding (13) in sequence and are then fixedly connected to the front end cover (1).

10. The servo motor according to claim 6, characterized in that, The servo motor also includes an encoder assembly (8) and an encoder cover (9), the encoder cover (9) being mounted on the rear cover (7), and the encoder assembly (8) being disposed inside the encoder cover (9).

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