Magnetic ring positioning and fixing structure and hub motor

Abstract

The utility model relates to the technical field of motors, in particular to a magnetic ring positioning and fixing structure and a hub motor, the hub motor comprises a base, a rotating shaft, a stator assembly, a rotor assembly, an end cover and a tire, the base is provided with a rotating connecting cavity, one end of the rotating shaft is arranged on the rotating connecting cavity, and the other end of the rotating shaft is fixedly connected with a rotating connecting part; the stator assembly is arranged on the base, the rotor assembly is arranged on the shell and opposite to the stator assembly, the outer diameter of the end cover is connected with the shell, and the inner diameter of the end cover is rotationally connected with the base. The magnetic ring positioning and fixing structure comprises a shell and a magnetic ring, a rotary connecting part is arranged at the axis of the shell, a plurality of positioning convex blocks are annularly and uniformly distributed on the shell with the rotary connecting part as the center, a positioning groove is formed between the positioning convex blocks and the rotary connecting part, and the magnetic ring is arranged on the positioning groove. According to the utility model, the installation process of the magnetic ring is simplified, the assembly difficulty is reduced, and the overall performance of the hub motor is also significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a magnetic ring positioning and fixing structure and a hub motor. Background Technology

[0002] Electric motors, as devices that convert electrical energy into mechanical energy (or vice versa), play a vital role in modern industry and daily life. From a professional perspective, electric motors primarily operate based on the principle of electromagnetic induction, and their core components typically include a stator, rotor, and electromagnetic windings. In an electric motor, the stator, as the stationary part, is usually equipped with electromagnetic windings to generate a rotating magnetic field. The rotor, as the rotating part, rotates due to the force exerted by the rotating magnetic field through electromagnetic induction, thereby converting electrical energy into mechanical energy. Furthermore, electric motors come in various types to adapt to different application scenarios.

[0003] Hub motors are power components used in mobility devices such as electric vehicles, electric cars, and wheeled robots. They primarily use an external rotor as the power output to achieve propulsion. However, existing hub motors require the installation of a magnetic ring internally, which demands high precision and is difficult to install. Therefore, a new design is needed to address the limitations of existing magnetic ring mounting structures. Utility Model Content

[0004] To address the aforementioned issues, this invention simplifies the installation process of the magnetic ring, reduces assembly difficulty, and significantly improves the overall performance of the hub motor through a magnetic ring positioning and fixing structure and hub motor.

[0005] The technical solution adopted by this utility model is: a magnetic ring positioning and fixing structure, including a shell and a magnetic ring; the shell is provided with a plurality of positioning protrusions evenly distributed in a ring around the axis of the shell; the magnetic ring is disposed on the shell, and each of the positioning protrusions positions the magnetic ring so that the axis of the magnetic ring is coaxial with the axis of the shell.

[0006] A further improvement to the above scheme is that each of the positioning protrusions forms a positioning surface facing the axis of the housing, and each positioning surface positions the magnetic ring.

[0007] A further improvement to the above scheme is that the positioning surface is an arc-shaped structure that matches the radius of curvature of the magnetic ring.

[0008] A further improvement to the above solution is that the positioning protrusion is formed by stamping the end face of the outer shell inward.

[0009] A further improvement to the above scheme is that the orthographic projection of the positioning protrusion on the surface of the outer shell is fan-shaped.

[0010] A further improvement to the above scheme is that the number of positioning protrusions is three, and the three positioning protrusions are evenly distributed in a ring around the axis of the outer shell.

[0011] A further improvement to the above solution is that a rotating connecting part is provided at the axis of the outer shell, and a positioning groove is formed between each positioning protrusion and the rotating connecting part, and the magnetic ring is disposed on the positioning groove.

[0012] A further improvement to the above solution is that the rotary connecting part is used to connect the rotating shaft of the motor, and the rotary connecting part is fixedly connected to the rotating shaft of the motor.

[0013] A hub motor includes the aforementioned magnetic ring positioning and fixing structure. The hub motor includes a base, a rotating shaft, a stator assembly, a rotor assembly, an end cover, and a tire. The base is provided with a rotating connecting cavity. One end of the rotating shaft is disposed on the rotating connecting cavity, and the other end is fixedly connected to the rotating connecting part. The stator assembly is disposed on the base. The rotor assembly is disposed on the outer shell and opposite to the stator assembly. The outer diameter of the end cover is connected to the outer shell, and the inner diameter is rotatably connected to the base. The tire is disposed outside the outer shell.

[0014] A further improvement to the above scheme is that a bearing is provided inside the rotary connection cavity, one end of the rotary shaft is connected to the bearing, and the other end is fixedly connected to the rotary connection part; the outer shell is provided with a sealed cavity, and a rotor support is provided inside the sealed cavity; the rotor assembly is composed of multiple rotor magnets, and multiple rotor fixing slots are provided on the rotor support, with the multiple rotor magnets correspondingly arranged on the multiple rotor fixing slots; the stator assembly includes a stator support and a coil winding, the stator support is provided with multiple winding arms, and the coil winding is arranged on the winding arms.

[0015] A further improvement to the above solution is that the base is provided with a mounting groove, a PCB board is provided on the mounting groove, and a sensing element is provided on the PCB board, the sensing element corresponding to the magnetic ring.

[0016] A further improvement to the above solution is that the end face of the outer shell is provided with multiple positioning holes, the tire is provided with a covering cavity, the covering cavity is sleeved on the outside of the outer shell, a positioning pin is provided inside the covering cavity, and the positioning holes are used for positioning pin assembly.

[0017] A further improvement to the above solution is that an anti-slip platform is provided on the outer periphery of the tire, and anti-slip protrusions are evenly distributed on the anti-slip platform.

[0018] A further improvement to the above scheme is that the tire wall has multiple shock-absorbing cavities evenly distributed in a circumferential direction.

[0019] The beneficial effects of this utility model are:

[0020] Compared to existing motor magnetic ring fixing structures, this invention cleverly designs a rotating connection part at the shaft center of the outer casing, achieving not only flexible installation and positioning of the magnetic ring but also ensuring structural stability and durability. The positioning groove formed between the evenly distributed circumferential positioning protrusions on the outer casing and the rotating connection part provides a precise and stable support platform for the magnetic ring, effectively preventing displacement and wobbling under high-speed rotation or complex operating conditions. This design not only simplifies the magnetic ring installation process and reduces assembly difficulty but also significantly improves the overall performance of the hub motor. As a key component in the hub motor, the precise positioning and stable operation of the magnetic ring have a crucial impact on the motor's operating efficiency, noise control, and service life.

[0021] The hub motor utilizes a magnetic ring positioning and fixing structure to ensure the stability and precision of the rotor assembly during high-speed rotation, effectively reducing noise and energy loss caused by vibration or sway, and improving the overall operating efficiency and reliability of the motor. Furthermore, this structure simplifies the assembly process. Secondly, the precise fit between the rotating connection cavity built into the base and the rotating shaft not only ensures smooth power transmission but also significantly enhances the structural durability, enabling the hub motor to withstand greater axial and radial loads, making it suitable for various complex road conditions and working environments. Thirdly, the optimized relative layout of the stator and rotor assemblies achieves higher electromagnetic coupling efficiency, thereby improving the motor's power density and torque output capability. This plays a crucial role in improving the vehicle's acceleration performance, climbing ability, and driving range. Regarding the end cap design, the robust connection between its outer diameter and the outer shell, and the flexible rotational connection between its inner diameter and the base, ensure the hub motor's airtightness, preventing the intrusion of external factors such as water and dust, while also ensuring the flexibility of tire contact with the ground, improving driving stability and handling response speed. Hub motor solutions, with their high efficiency, stability, durability and ease of maintenance, are mainly used in wheeled robots, electric vehicles, electric bicycles, unmanned transport vehicles and various wheeled robots. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the motor of this utility model;

[0023] Figure 2 for Figure 1 A top view of the motor.

[0024] Figure 3 for Figure 2 Sectional view of AA;

[0025] Figure 4 This is a schematic diagram of the magnetic ring positioning and fixing structure of this utility model.

[0026] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Rotary connecting part; 12. Positioning protrusion; 13. Rotor bracket; 14. Positioning hole; 2. Magnetic ring; 3. Rotary shaft; 4. Base; 41. Rotary connecting cavity; 42. Mounting groove; 43. PCB board; 44. Induction components; 5. Stator assembly; 51. Stator bracket; 51. Winding arm; 511. Coil winding; 52. Rotor assembly; 6. Rotor magnet; 61. End cover; 7. Tire; 8. Covering cavity; 81. Anti-slip platform; 82. Anti-slip protrusion; 83. Shock-absorbing cavity; 84. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] like Figures 1-4 As shown, in one embodiment of this utility model, a magnetic ring positioning and fixing structure is provided, including a housing 1 and a magnetic ring 2. A rotating connecting part 11 is provided at the axis of the housing 1. Multiple positioning protrusions 12 are evenly distributed circumferentially around the rotating connecting part 11 on the housing 1. Positioning grooves are formed between the multiple positioning protrusions 12 and the rotating connecting part 11, and the magnetic ring 2 is disposed on the positioning grooves. This embodiment, by cleverly designing the rotating connecting part 11 at the axis of the housing 1, not only achieves flexible installation and positioning of the magnetic ring 2, but also ensures the stability and durability of the structure. The positioning grooves formed between the evenly distributed circumferential positioning protrusions 12 on the housing 1 and the rotating connecting part 11 provide a precise and stable support platform for the magnetic ring 2, effectively preventing the magnetic ring 2 from shifting or shaking under high-speed rotation or complex working conditions. This design not only simplifies the installation process of the magnetic ring 2 and reduces assembly difficulty, but also significantly improves the overall performance of the hub motor. As a key component in the hub motor, the precise positioning and stable operation of the magnetic ring 2 have a crucial impact on the motor's operating efficiency, noise control, and service life.

[0031] Each of the positioning protrusions 12 forms a positioning surface 121 facing the axis of the outer casing 1, and each positioning surface 121 positions the magnetic ring 2. In this embodiment, by forming positioning surfaces 121 on the side of each positioning protrusion 12 facing the axis of the outer casing 1, these positioning surfaces 121 can more accurately and stably contact and fix the magnetic ring 2. Compared with a design without positioning surfaces 121, this structure can greatly reduce the shaking or displacement of the magnetic ring 2 during installation and use, thereby improving the overall stability and reliability. The design of the positioning surfaces 121 also makes it easier to achieve coaxiality between the axis of the magnetic ring 2 and the axis of the outer casing 1. The setting of the positioning protrusions 12 and the positioning surfaces 121 allows the magnetic ring 2 to be quickly and accurately positioned on the outer casing 1, greatly saving assembly time and cost. Specifically, the positioning surface 121 is an arc-shaped structure with the same radius of curvature as the magnetic ring 2. The arc-shaped positioning surface 121 can better conform to the curved surface characteristics of the magnetic ring 2, avoiding stress concentration problems caused by shape mismatch and extending the service life of the product. It also helps optimize the transmission efficiency of the magnetic circuit. Due to the perfect fit between the positioning surface 121 and the magnetic ring 2, the possibility of magnetic leakage is reduced, allowing magnetic energy to be transmitted more concentratedly and efficiently. The rotating connection part 11 is used to connect the rotating shaft 3 of the motor, and the rotating connection part 11 is fixedly connected to the rotating shaft 3 of the motor. In this embodiment, the rotating connection part 11 ensures the stability and accuracy of power transmission by fixing the rotating shaft 3 of the motor. In the positioning and fixing structure of the magnetic ring 2, this connection method not only enhances the overall rigidity of the structure but also effectively reduces vibration and noise caused by rotational movement. Specifically, the precise design of the rotating connection part 11 makes the relative movement between the rotating shaft 3 of the motor and the positioning structure of the magnetic ring 2 smoother, reducing wear and malfunctions that may be caused by poor movement. At the same time, this structure helps optimize the distribution of the magnetic field, improves electromagnetic conversion efficiency, and thus enhances the performance of the entire system.

[0032] The positioning protrusion 12 is formed by stamping an inward protrusion from the end face of the outer shell 1. The orthographic projection of the positioning protrusion 12 is fan-shaped. In this embodiment, when the positioning protrusion 12 is formed by stamping an inward protrusion from the end face of the outer shell 1, it not only ensures the precise positioning of the magnetic ring 2 during assembly, but also effectively improves the overall fixing stability. The fit between the positioning protrusion 12 and the magnetic ring 2 is tight and firm, effectively preventing displacement or loosening of the magnetic ring 2 during use. At the same time, the stamped positioning protrusion 12 has high precision and consistency, which helps to ensure the overall performance and quality stability of the positioning and fixing structure of the magnetic ring 2. The positioning protrusion can also be cylindrical, triangular, or other shapes.

[0033] A hub motor includes the aforementioned magnetic ring 2 positioning and fixing structure. The hub motor includes a base 4, a rotating shaft 3, a stator assembly 5, a rotor assembly 6, an end cover 7, and a tire 8. The base 4 is provided with a rotating connecting cavity 41. One end of the rotating shaft 3 is disposed on the rotating connecting cavity 41, and the other end is fixedly connected to a rotating connecting part 11. The stator assembly 5 is disposed on the base 4, and the rotor assembly 6 is disposed on the outer shell 1 and opposite to the stator assembly 5. The outer diameter of the end cover 7 is connected to the outer shell 1, and its inner diameter is rotatably connected to the base 4. The tire 8 is disposed outside the outer shell 1. In this embodiment, the hub motor, through the magnetic ring 2 positioning and fixing structure, ensures the stability and accuracy of the rotor assembly 6 during high-speed rotation, effectively reducing noise and energy loss caused by vibration or sway, and improving the overall operating efficiency and reliability of the motor. In addition, this structure simplifies the assembly process. Secondly, the precise fit between the rotating connecting cavity 41 built into the base 4 and the rotating shaft 3 not only ensures smooth and unobstructed power transmission but also greatly enhances the structural durability, enabling the hub motor to withstand greater axial and radial loads and making it suitable for various complex road conditions and working environments. Furthermore, the optimized relative layout of the stator assembly 5 and the rotor assembly 6 achieves higher electromagnetic coupling efficiency, thereby improving the motor's power density and torque output capability. This plays a crucial role in improving the vehicle's acceleration performance, climbing ability, and driving range. Regarding the end cover 7 design, its robust connection between its outer diameter and the outer shell 1, and its flexible rotational connection between its inner diameter and the base 4, ensure the hub motor's sealing, preventing the intrusion of external factors such as water and dust, while also ensuring the flexibility of the tire 8's contact with the ground, improving driving stability and handling response speed. With its high efficiency, stability, durability, and ease of maintenance, the hub motor solution is mainly used in wheeled robots, electric vehicles, electric bicycles, unmanned transport vehicles, and various wheeled robots.

[0034] A bearing is installed inside the rotary connecting cavity 41. One end of the rotating shaft 3 is connected to the bearing, and the other end is fixedly connected to the rotary connecting part 11. The outer shell 1 has a sealed cavity, and a rotor support 13 is installed inside the sealed cavity. The rotor assembly 6 is composed of multiple rotor magnets 61. The rotor support 13 has multiple rotor fixing slots, and the multiple rotor magnets 61 are correspondingly installed on the multiple rotor fixing slots. The stator assembly 5 includes a stator support 51 and a coil winding 52. The stator support 51 has multiple winding arms 511, and the coil winding 52 is installed on the winding arms 511. In this embodiment, the bearing installed inside the rotary connecting cavity 41 can effectively support the rotating shaft 3, ensuring its smooth and low-friction rotation, which greatly improves the operating efficiency and durability of the motor. The precise connection between one end of the rotating shaft 3 and the bearing, and the stable fixation between the other end and the rotary connecting part 11, ensure the accuracy and reliability of power transmission and reduce energy loss. The sealed cavity within the outer casing 1 provides excellent protection for the internal components, preventing interference from external impurities and ensuring the stability and safety of the motor's operation. Multiple rotor mounting slots on the rotor bracket 13 allow for the precise installation of multiple rotor magnets 61. This layout not only optimizes the magnetic circuit structure but also enhances the motor's torque output capability. Regarding the stator assembly 5, multiple winding arms 511 on the stator bracket 51 provide robust support for the coil windings 52, ensuring stable current transmission. The coil windings 52 are carefully arranged on the winding arms 511, efficiently converting electrical energy into magnetic energy, thereby driving the rotor to rotate and achieving efficient power conversion.

[0035] The base 4 is provided with a mounting groove 42, on which a PCB board 43 is mounted. Sensing components 44 are mounted on the PCB board 43, corresponding to the magnetic ring 2. In this embodiment, the mounting groove 42 on the base 4 provides a stable and precise positioning environment for the PCB board 43, ensuring reliable installation and long-term operational stability of the PCB board 43 inside the hub motor. The design of the mounting groove 42 not only simplifies the assembly process of the PCB board 43 but also effectively avoids component loosening or damage due to vibration or external impact through precise dimensional control. The carefully arranged sensing components 44 on the PCB board 43 precisely correspond to the magnetic ring 2, significantly improving the sensing accuracy and response speed of the hub motor. The sensing components 44 can accurately capture changes in the magnetic field generated by the magnetic ring 2 in real time, thereby achieving precise monitoring and control of key parameters such as motor speed and position. This not only optimizes the motor's operating efficiency but also significantly enhances the motor's dynamic response capability and stability.

[0036] The end face of the outer casing 1 is provided with multiple positioning holes 14. The tire 8 is provided with a covering cavity 81, which is fitted onto the outside of the outer casing 1. A positioning pin is provided inside the covering cavity 81, and the positioning holes 14 are used for positioning the positioning pin. In this embodiment, precise positioning and stable connection between the tire 8 and the outer casing 1 are ensured. The assembly mechanism of the positioning holes 14 and the positioning pin effectively prevents the tire 8 from shifting or shaking during rotation, thereby improving the operational stability and safety of the hub motor. Secondly, the precise cooperation between the positioning holes 14 and the positioning pin achieves high-precision docking between the tire 8 and the outer casing 1. This not only helps to reduce assembly errors but also reduces noise and vibration to a certain extent, improving the overall performance of the hub motor. In addition, this structure facilitates the disassembly and maintenance of the tire 8. When it is necessary to replace or repair the tire 8, the tire 8 can be easily separated and reassembled from the outer casing 1 by operating the positioning pin, greatly improving work efficiency.

[0037] The tire 8 has an anti-slip platform 82 on its outer periphery, and anti-slip protrusions 83 are evenly distributed on the anti-slip platform 82. Specifically, multiple shock-absorbing chambers 84 are evenly distributed circumferentially on the wall surface of the tire 8. In this embodiment, the anti-slip platform 82 and the evenly distributed anti-slip protrusions 83 on the outer periphery of the tire 8 can effectively increase the friction between the tire 8 and the ground. Especially in wet or complex road conditions, this design can significantly improve the vehicle's grip, reduce slippage, and ensure driving stability. In addition, the multiple shock-absorbing chambers 84 evenly distributed circumferentially on the wall surface of the tire 8 have excellent shock absorption and noise reduction effects. These shock-absorbing chambers 84 can absorb and disperse the vibration energy generated during driving, reducing the noise when the tire 8 impacts the ground.

[0038] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A magnetic ring positioning and fixing structure, characterized in that: It includes a housing and a magnetic ring; the housing is provided with a plurality of positioning protrusions evenly distributed in a ring around the axis of the housing; the magnetic ring is disposed on the housing, and each of the positioning protrusions positions the magnetic ring so that the axis of the magnetic ring is coaxial with the axis of the housing.

2. The magnetic ring positioning and fixing structure according to claim 1, characterized in that: Each of the positioning protrusions forms a positioning surface facing the axis of the housing, and each positioning surface positions the magnetic ring.

3. The magnetic ring positioning and fixing structure according to claim 2, characterized in that: The positioning surface is an arc-shaped structure that matches the radius of curvature of the magnetic ring.

4. The magnetic ring positioning and fixing structure according to claim 1, characterized in that: The positioning bump is formed by stamping the end face of the outer shell inward.

5. The magnetic ring positioning and fixing structure according to claim 1, characterized in that: The orthographic projection of the positioning protrusion on the surface of the outer shell is fan-shaped.

6. The magnetic ring positioning and fixing structure according to claim 1, characterized in that: The number of positioning bumps is three, and the three positioning bumps are evenly distributed in a ring around the axis of the outer shell.

7. The magnetic ring positioning and fixing structure according to claim 1, characterized in that: A rotating connection part is provided at the axis of the outer shell, and a positioning groove is formed between each positioning protrusion and the rotating connection part. The magnetic ring is disposed on the positioning groove.

8. The magnetic ring positioning and fixing structure according to claim 7, characterized in that: The rotary connector is used to connect the rotating shaft of the motor, and the rotary connector is fixedly connected to the rotating shaft of the motor.

9. A hub motor, characterized in that: The hub motor includes the magnetic ring positioning and fixing structure according to any one of claims 1 to 8, comprising a base, a rotating shaft, a stator assembly, a rotor assembly, an end cover, and a tire. The base is provided with a rotating connecting cavity. One end of the rotating shaft is disposed on the rotating connecting cavity, and the other end is fixedly connected to the rotating connecting part. The stator assembly is disposed on the base. The rotor assembly is disposed on the outer shell and is opposite to the stator assembly. The outer diameter of the end cover is connected to the outer shell, and the inner diameter is rotatably connected to the base. The tire is disposed outside the outer shell.

10. The hub motor according to claim 9, characterized in that: A bearing is provided inside the rotary connection cavity, and one end of the rotary shaft is connected to the bearing, while the other end is fixedly connected to the rotary connection part.

Images