Stator assembly and motor

Abstract

This utility model provides a stator assembly and a motor. The stator assembly includes: a stator structure (7) having a stator inner circle; a front bearing housing end cover (9) disposed at the first end of the stator structure (7); a rear bearing housing end cover (10) disposed at the second end of the stator structure (7), the stator structure (7), the front bearing housing end cover (9) and the rear bearing housing end cover (10) being coaxially arranged; and an injection molding structure (12) for injection molding the stator structure (7), the front bearing housing end cover (9) and the rear bearing housing end cover (10) into one piece. According to the stator assembly of this utility model, the coaxiality between the front and rear bearing housings and the stator inner circle can be effectively guaranteed, noise vibration can be reduced, and cogging torque and torque pulsation can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically, to a stator assembly and a 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] In traditional servo motor designs, the stator is typically fixed to a housing composed of aluminum alloy front and rear end covers using a heat-shrink fitting process, while the bearings are housed in the bearing chambers of the end covers. This structural design ensures the motor's basic performance to a certain extent, but with increasingly stringent demands for motor control precision and stability, the original assembly methods and component precision standards are proving inadequate. Specifically, the stop fit between the front and rear end covers and the housing directly determines the coaxiality of the two bearing chambers. However, in actual assembly, due to the accumulation of manufacturing tolerances and assembly errors, it is often difficult to ensure that this coaxiality meets extremely high requirements. Once the coaxiality deviation exceeds the allowable range, it will cause the rotor to become eccentric during rotation, leading to increased vibration and noise during motor operation, a significant increase in cogging torque and torque fluctuations, and severely affecting the overall stability and control performance of the system. Utility Model Content

[0004] The main purpose of this utility model is to provide a stator assembly and motor that can effectively ensure the coaxiality between the front and rear bearing housings and the inner circle of the stator, reduce noise and vibration, and reduce cogging torque and torque pulsation.

[0005] To achieve the above objectives, according to one aspect of the present invention, a stator assembly is provided, comprising:

[0006] The stator structure includes an inner stator circle;

[0007] The front bearing housing end cover is located at the first end of the stator structure;

[0008] The rear bearing housing end cover is located at the second end of the stator structure. The stator structure, the front bearing housing end cover, and the rear bearing housing end cover are coaxially arranged.

[0009] The injection-molded structure integrates the stator structure, the front bearing housing end cover, and the rear bearing housing end cover into a single unit.

[0010] Furthermore, the stator assembly also includes a circuit board and pins. The circuit board is electrically connected to the stator structure, and the pins are electrically connected to the circuit board. The circuit board and pins are injection molded together with the stator structure through an injection molding structure, and the ends of the pins extend out of the injection molding structure.

[0011] Furthermore, the rear bearing chamber end cover includes an annular chamber wall and a shoulder connected to each other, the shoulder being located at the axial outer end of the annular chamber wall and disposed on the radial inner side of the annular chamber wall.

[0012] Furthermore, injection connection holes are provided on the side walls of the front bearing housing end cover and / or the rear bearing housing end cover, and the injection molding structure fills into the injection connection holes.

[0013] Furthermore, the front bearing housing end cover and / or the rear bearing housing end cover are formed by stamping.

[0014] Furthermore, the inner circle of the stator, the inner circle of the rear bearing chamber end cover, and the inner circle of the front bearing chamber end cover are further processed and formed after the stator structure and the rear bearing chamber end cover are injection molded.

[0015] Furthermore, the stator structure includes a stator core, which comprises a separate stator yoke and a stator tooth section.

[0016] According to another aspect of the present invention, an electric motor is provided, including a stator assembly and a rotor assembly, wherein the stator assembly is the stator assembly described above, and the stator assembly is sleeved on the outside of the rotor assembly.

[0017] Furthermore, the motor also includes a front end cover, an encoder assembly, an encoder cover, and a connector. The front end cover is connected to the first end of the stator assembly, the encoder assembly and the encoder cover are located at the second end of the stator assembly, and the connector is located on the encoder cover.

[0018] Furthermore, a front bearing is installed inside the front bearing housing end cover, and a wave-shaped elastic washer is installed between the front bearing and the front end cover.

[0019] By applying the technical solution of this utility model, the stator assembly integrates the stator structure, the front bearing chamber end cover, and the rear bearing chamber end cover into a single coaxial injection molded structure. This allows for the initial coaxial formation of the stator structure, the front bearing chamber end cover, and the rear bearing chamber end cover using tooling. While ensuring the coaxiality of these components, the stator structure, the front bearing chamber end cover, and the rear bearing chamber end cover are then integrally injection molded. This effectively improves the coaxiality of the stator structure, the front bearing chamber end cover, and the rear bearing chamber end cover, eliminating the rotor eccentricity problem caused by component alignment deviations during traditional assembly. This significantly reduces rotor vibration and noise during high-speed rotation, thereby reducing cogging torque and torque fluctuations, and greatly improving the operating efficiency, response speed, and overall stability of the servo motor. Attached Figure Description

[0020] 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:

[0021] Figure 1 A cross-sectional view of the motor according to an embodiment of the present invention is shown.

[0022] Figure 2 A cross-sectional view of a stator assembly according to an embodiment of the present invention is shown.

[0023] Figure 3 A cross-sectional view of the rotor assembly according to an embodiment of the present invention is shown.

[0024] Figure 4 A schematic diagram of the structure of the rear bearing chamber end cover of the stator assembly according to an embodiment of the present invention is shown.

[0025] Figure 5 A cross-sectional view of the rear bearing chamber end cover of the stator assembly according to an embodiment of the present invention is shown.

[0026] Figure 6 A schematic diagram of the structure of the front bearing chamber end cover of the stator assembly according to an embodiment of the present invention is shown;

[0027] Figure 7 A cross-sectional view of the front bearing chamber end cover of the stator assembly according to an embodiment of the present invention is shown.

[0028] Figure 8 A first-view perspective three-dimensional structural schematic diagram of the stator assembly of an embodiment of the present invention before injection molding is shown;

[0029] Figure 9A second-view perspective three-dimensional structural schematic diagram of the stator assembly of an embodiment of the present invention before injection molding is shown;

[0030] Figure 10 A schematic diagram of the assembly structure of the stator assembly and the spindle according to an embodiment of the present invention is shown.

[0031] Figure 11 A three-dimensional structural schematic diagram of the mandrel according to an embodiment of the present invention is shown;

[0032] Figure 12 A schematic diagram of the semi-assembly structure of the motor according to an embodiment of the present invention is shown.

[0033] The above figures include the following reference numerals:

[0034] 1. Front cover; 2. Stator assembly; 3. Rotor assembly; 4. Encoder assembly; 5. Encoder cover; 6. Connector; 7. Stator structure; 8. Circuit board; 9. Front bearing chamber end cover; 10. Rear bearing chamber end cover; 11. Pin; 12. Injection molded structure; 13. Rotor shaft; 14. Rotor core; 15. Magnet; 16. Front bearing; 17. Rear bearing; 18. Core column; 19. First plane; 20. Second plane; 21. Annular chamber wall; 22. Shoulder; 23. Injection molded connection hole. Detailed Implementation

[0035] 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.

[0036] See also Figures 1 to 12 As shown, according to an embodiment of the present invention, the stator assembly includes: a stator structure 7 having a stator inner circle; a front bearing chamber end cover 9 disposed at the first end of the stator structure 7; a rear bearing chamber end cover 10 disposed at the second end of the stator structure 7, the stator structure 7, the front bearing chamber end cover 9 and the rear bearing chamber end cover 10 being coaxially arranged; and an injection molding structure 12 for injection molding the stator structure 7, the front bearing chamber end cover 9 and the rear bearing chamber end cover 10 into one piece.

[0037] This stator assembly integrates the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 into a single coaxial injection molded structure. This allows for the initial coaxial formation of the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 using tooling. While ensuring the coaxiality of these components, the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 are then integrally injection molded. This effectively improves the coaxiality of the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10, eliminating the rotor eccentricity problem caused by component alignment deviations during traditional assembly. This significantly reduces rotor vibration and noise during high-speed rotation, thereby reducing cogging torque and torque fluctuations, and greatly improving the operating efficiency, response speed, and overall stability of the servo motor.

[0038] In one embodiment, the stator assembly further includes a circuit board 8 and a pin 11. The circuit board 8 is electrically connected to the stator structure 7, and the pin 11 is electrically connected to the circuit board 8. The circuit board 8 and the pin 11 are integrally injection molded with the stator structure 7 through an injection molding structure 12, and the end of the pin 11 extends out of the injection molding structure 12.

[0039] The circuit board 8 and pins 11 are integrated with the stator structure 7 via injection molding 12, ensuring not only the stability and reliability of the electrical connection but also providing a convenient external electrical interface through the protruding end design of the pins 11. This reduces signal interference and poor contact problems that may occur with traditional connection methods. This structure effectively maintains circuit stability and signal transmission accuracy during high-speed operation of the servo motor, reducing the risk of motor performance degradation due to loose electrical connections. It also enhances the motor's waterproof and dustproof performance, extending its service life.

[0040] In one embodiment, the rear bearing chamber end cover 10 includes an annular chamber wall 21 and a shoulder 22 connected to each other. The shoulder 22 is located at the axial outer end of the annular chamber wall 21 and is disposed on the radial inner side of the annular chamber wall 21.

[0041] The structural design of the annular chamber wall 21 and the shoulder 22 of the rear bearing chamber end cover 10 effectively ensures the precise positioning and stable support of the bearing. The shoulder 22 is constructed on the radial inner side of the annular chamber wall 21, which can limit the rotor assembly during rotor assembly, facilitate the precise positioning of the rotor assembly, and at the same time, can withstand the axial thrust of the rotor during motor operation, prevent the rotor axial displacement, significantly improve the axial stability of the motor, and reduce noise and torque fluctuations caused by axial vibration.

[0042] A chamfer is provided at the connection position between the shoulder 22 and the annular chamber wall 21. The chamfer size is R1.2mm, which can be adjusted according to the actual situation to facilitate the assembly of the rotor assembly. The axial distance is produced with a negative tolerance of -0.1mm.

[0043] In this embodiment, since the injection-molded structure 12 can function as the housing of a conventional motor and the rear bearing chamber end cover 10 can function as a conventional rear end cover, the end cover and housing of a conventional motor can be eliminated, reducing the cost of aluminum profile end covers and lowering the overall cost of the machine.

[0044] In one embodiment, injection connection holes 23 are provided on the side walls of the front bearing chamber end cover 9 and / or the rear bearing chamber end cover 10, and the injection structure 12 fills into the injection connection holes 23.

[0045] Injection molding connection holes 23 are provided on the side walls of the front bearing housing end cover 9 and / or the rear bearing housing end cover 10, and the injection molding structure 12 is filled into these injection molding connection holes 23. This strengthens the physical connection between the components of the stator assembly, significantly improves the rigidity and consistency of the overall structure, effectively avoids component loosening caused by long-term operation or temperature changes, ensures the reliable performance of the motor under dynamic load, enhances vibration resistance, further reduces operating noise, optimizes cogging torque and torque fluctuation, and improves the operating stability and service life of the servo motor.

[0046] In one embodiment, the injection molding connection hole 23 can be provided on the axially extending sidewall of the front bearing housing end cover 9 and the rear bearing housing end cover 10, or it can be provided on the radially extending sidewall of the front bearing housing end cover 9 and the rear bearing housing end cover 10. This can improve the strength of the connection structure between the injection molding structure 12 and the front bearing housing end cover 9 and the rear bearing housing end cover 10, so that the end cover is reliably fixed in the injection molding structure 12. The number of injection molding connection holes 23 can be at least one. When the number of injection molding connection holes 23 is multiple, the multiple injection molding connection holes 23 can be evenly arranged along the circumference of the end cover.

[0047] The injection connection hole 23 can be circular, polygonal, or other shapes, such as a combination of arcs and straight lines.

[0048] In one embodiment, the front bearing chamber end cover 9 and / or the rear bearing chamber end cover 10 are stamped.

[0049] Manufacturing the front bearing housing end cover 9 and / or the rear bearing housing end cover 10 using a stamping process not only achieves high-precision geometric and dimensional control, ensuring accurate matching with the stator structure 7 and other components, but also reduces costs through mass production. The end covers formed by this process provide stable bearing support and excellent mechanical properties during motor operation, helping to reduce rotor eccentricity caused by end cover deformation or improper assembly, thereby reducing vibration and noise during operation and improving cogging torque and torque ripple.

[0050] In one embodiment, the front bearing housing end cover 9 and the rear bearing housing end cover 10 are made of hot-dip galvanized sheet DX51D, with a thickness of 1.2 mm and a coating thickness of 10 μm to 12 μm, and a uniform and smooth color. The front bearing housing end cover 9 and the rear bearing housing end cover 10 can also be made of other metal materials through stretching and forming.

[0051] In one embodiment, the inner circle of the stator, the inner circle of the rear bearing chamber end cover 10, and the inner circle of the front bearing chamber end cover 9 are formed by secondary processing after the stator structure 7 and the rear bearing chamber end cover 10 are injection molded.

[0052] By performing secondary precision machining after injection molding of the stator structure 7 and the rear bearing housing end cover 10, it is possible to ensure that the inner circle of the stator, the inner circle of the rear bearing housing end cover 10, and the inner circle of the front bearing housing end cover 9 achieve extremely high coaxiality and geometric accuracy. This significantly improves the overall assembly accuracy of the motor, reduces friction and vibration during mechanical operation, thereby effectively reducing cogging torque and torque fluctuation, and enhancing the dynamic response capability and control stability of the servo motor.

[0053] In one embodiment, the stator structure 7 includes a stator core, which includes a separate stator yoke and a stator tooth.

[0054] The stator structure 7 adopts a split design, manufacturing the stator yoke and stator teeth separately before assembly. This facilitates precise control of the geometric dimensions and magnetic properties of each part, optimizes the motor's magnetic field distribution, reduces magnetic circuit losses, and improves motor efficiency. During motor operation, the split stator core better adapts to thermal expansion and contraction, reducing mechanical stress caused by temperature changes. This lowers vibration and noise, improves cogging torque and torque ripple, resulting in superior performance of the servo motor in high-precision control applications.

[0055] The stator yoke and stator teeth adopt a separate structure, which can make the inner circle of the stator more round and smooth, effectively avoiding the injection of plastic material onto the inner surface of the stator during the injection molding process.

[0056] According to an embodiment of the present invention, the above-mentioned method for forming the stator assembly includes:

[0057] 7. Molded stator structure;

[0058] Bearing chamber end cover 9 before molding;

[0059] After molding, the bearing housing end cover 10;

[0060] The stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 are injection molded into one piece.

[0061] The stator structure 7, the front bearing housing end cover 9, and the rear bearing housing end cover 10, which are independently formed, are first adjusted for coaxiality using tooling, and then integrated into one piece through injection molding. This not only greatly improves the assembly accuracy and mechanical stability between the components and reduces the cumulative errors in traditional assembly, but also enhances the sealing performance and environmental resistance of the overall structure. This allows the motor to maintain low vibration, low noise, and high precision characteristics even under high-speed operation and extreme working conditions, effectively reducing cogging torque and torque fluctuation, and significantly improving the overall performance and reliability of the servo motor.

[0062] In one embodiment, the step of injection molding the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 into one piece includes:

[0063] Press the front bearing chamber end cover 9 into the core post 18 of the injection mold, and make the end face of the front bearing chamber end cover 9 contact the first plane 19 of the core post 18.

[0064] The stator structure 7 is pressed into the core column 18 of the injection mold, so that the inner wall of the stator is in contact with the cylindrical surface of the core column 18.

[0065] The rear bearing chamber end cover 10 is pressed into the core post 18 of the injection mold and limited by the second plane 20 of the core post 18;

[0066] Injection molding is performed into the injection mold.

[0067] In this embodiment, the smooth surface of the core post 18 can be tightly fitted with the smooth surface of the inner circle of the stator through the above method, which effectively prevents the injection plastic from flowing in during injection molding, ensures the smoothness of the inner circle of the stator, and improves the molding quality of the stator assembly.

[0068] In one embodiment, the inner circles of the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 are all provided with machining allowances. After the step of injection molding the stator structure 7, the front bearing chamber end cover 9, and the rear bearing chamber end cover 10 into one piece, the following is also included:

[0069] The inner circle of the stator structure 7, the inner circle of the front bearing chamber end cover 9, and the inner circle of the rear bearing chamber end cover 10 are machined to the preset dimensions.

[0070] In this embodiment, to further improve the coaxiality of the inner circles of the front bearing housing end cover 9 and the rear bearing housing end cover 10 with the stator inner circle, a certain machining allowance can be reserved during the machining of the inner circles of the front bearing housing end cover 9 and the rear bearing housing end cover 10 with the stator inner circle. After the stator assembly 2 is injection molded, the inner circles of the front bearing housing end cover 9 and the rear bearing housing end cover 10 with the stator inner circle are machined to achieve higher precision requirements. The machining allowance can be set as needed; in one embodiment, the machining allowance is 0.2 mm.

[0071] The manufacturing process of stator assembly 2 is as follows:

[0072] After the stator structure 7 is welded to the circuit board 8, pins 11 are welded onto the circuit board 8. The front bearing housing end cover 9 is then pressed into the core column 18 of the injection mold using a pressing device and corresponding tooling. Subsequently, the stator structure 7 and the rear bearing housing end cover 10 are pressed in sequence. The front and rear bearing housing end covers 9 and 10 are tightly fitted to the bearing mating surfaces of the core column 18, and the inner wall of the stator structure 7 is tightly fitted to the core column 18 to prevent the injection molding material from flowing in during injection. The front bearing housing end cover 9 is assembled into the core column 18, contacting the first plane 19 of the core column 18. Then, the stator structure 7 is pressed in, with the bottom surface of the stator core of the stator structure 7 limited by tooling. Finally, the rear bearing housing end cover 10 is pressed in, limited by the second plane 20. Place the core column 18 in the lower mold mating position, adjust the injection molding machine parameters, close the mold to complete the injection molding, and the front bearing chamber end cover 9, the rear bearing chamber end cover 10 and the stator structure 7 are integrally injection molded. The appearance of the stator assembly 2 is required to be smooth and flat. No injection plastic flows into the bearing chamber and the inner circle of the stator. The machine housing is injection molded using injection plastic instead of the traditional aluminum machine housing. The front and rear stops are fitted with the front cover 1 and the encoder cover 5 with clearance.

[0073] See also Figures 1 to 12 As shown, according to an embodiment of the present invention, the motor includes a stator assembly 2 and a rotor assembly 3, wherein the stator assembly 2 is the stator assembly 2 described above, and the stator assembly 2 is sleeved on the outside of the rotor assembly 3.

[0074] In one embodiment, the motor further includes a front cover 1, an encoder assembly 4, an encoder cover 5, and a connector 6. The front cover 1 is connected to the first end of the stator assembly 2, the encoder assembly 4 and the encoder cover 5 are disposed at the second end of the stator assembly 2, and the connector 6 is disposed on the encoder cover 5.

[0075] By combining the front cover 1, encoder assembly 4, encoder cover 5 and connector 6 with the stator assembly 2, the front cover 1 and the first end of the stator assembly 2, as well as the encoder assembly 4 and encoder cover 5, can be accurately installed at the second end of the stator assembly 2. This ensures the structural integrity and alignment of the motor in the axial direction, effectively avoids axial movement and radial offset of the rotor shaft 13 during high-speed rotation, thereby significantly reducing mechanical vibration and noise, and significantly improving the rotational smoothness and control accuracy of the motor.

[0076] The rotor assembly 3 includes a rotor shaft 13, a rotor core 14, a magnet 15, a front bearing 16, and a rear bearing 17.

[0077] After the magnets 15 are installed on the rotor core 14, it is heat-shrink into the rotor shaft 13 through a specific tooling and is interference-fitted with the rotor shaft 13. The front bearing 16 and the rear bearing 17 are pressed into the rotor shaft 13 through a specific tooling to form the rotor assembly 3.

[0078] After the stator assembly 2 is formed, the motor assembly process is as follows:

[0079] Apply bearing adhesive to the front bearing housing end cover 9 and the rear bearing housing end cover 10 of stator assembly 2. Insert rotor assembly 3 from the front end of stator assembly 2 using a centering fixture. Press the bearings into the corresponding bearing housings of stator assembly 2 until the side of the rear bearing 17 contacts the shoulder 22 of the rear bearing housing end cover 10. Place a wave-shaped elastic washer at the front bearing 16 to provide preload. Position and assemble the rotor shaft 13 with the rear bearing 17. Assemble the front cover 1, completing the motor semi-assembly assembly. Then assemble encoder assembly 4. Lead out the three motor power lines (U, V, W) through pins 11 in stator assembly 2. The power lines and signal lines of encoder assembly 4 exit through connector 6. Connector 6 is sealed to encoder cover 5 with a gasket. Connector 6 provides a mixed power and signal output; alternatively, two separate connectors can be used, depending on actual requirements. Place a sealing ring in encoder cover 5. After assembling encoder cover 5, complete the overall assembly.

[0080] 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.

[0081] 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.

[0082] 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 by, include: The stator structure (7) has an inner circle; The front bearing housing end cover (9) is disposed at the first end of the stator structure (7); The rear bearing chamber end cover (10) is disposed at the second end of the stator structure (7), and the stator structure (7), the front bearing chamber end cover (9) and the rear bearing chamber end cover (10) are coaxially disposed. The injection molding structure (12) integrates the stator structure (7), the front bearing chamber end cover (9), and the rear bearing chamber end cover (10) into one piece.

2. The stator assembly of claim 1, wherein, The stator assembly also includes a circuit board (8) and a pin (11). The circuit board (8) is electrically connected to the stator structure (7), and the pin (11) is electrically connected to the circuit board (8). The circuit board (8) and the pin (11) are integrally injection molded with the stator structure (7) through the injection molding structure (12). The end of the pin (11) extends out of the injection molding structure (12).

3. The stator assembly of claim 1, wherein, The rear bearing chamber end cover (10) includes an annular chamber wall (21) and a shoulder (22) connected to each other. The shoulder (22) is located at the axial outer end of the annular chamber wall (21) and is disposed on the radial inner side of the annular chamber wall (21).

4. The stator assembly of claim 1, wherein, The front bearing chamber end cap (9) and / or the rear bearing chamber end cap (10) are provided with injection connection holes (23), and the injection structure (12) fills into the injection connection holes (23).

5. The stator assembly of claim 1, wherein, The front bearing chamber end cover (9) and / or the rear bearing chamber end cover (10) are formed by stamping.

6. The stator assembly of claim 1, wherein, The inner circle of the stator, the inner circle of the rear bearing chamber end cover (10), and the inner circle of the front bearing chamber end cover (9) are formed by secondary processing after the stator structure (7) and the rear bearing chamber end cover (10) are injection molded.

7. The stator assembly of any one of claims 1 to 6, wherein, The stator structure (7) includes a stator core, which includes a separate stator yoke and a stator tooth.

8. An electric machine comprising a stator assembly (2) and a rotor assembly (3), characterized in that The stator assembly (2) is the stator assembly (2) according to any one of claims 1 to 7, and the stator assembly (2) is sleeved on the rotor assembly (3).

9. The electric machine of claim 8, wherein, The motor also includes a front cover (1), an encoder assembly (4), an encoder cover (5), and a connector (6). The front cover (1) is connected to the first end of the stator assembly (2), the encoder assembly (4) and the encoder cover (5) are disposed at the second end of the stator assembly (2), and the connector (6) is disposed on the encoder cover (5).

10. The electric machine of claim 9, wherein, A front bearing (16) is provided inside the front bearing chamber end cover (9), and a wave-shaped elastic washer is provided between the front bearing (16) and the front end cover (1).

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