Rear cover structure of coreless brushless motor

Abstract

The utility model relates to the technical field of brushless motors, in particular to a rear cover structure of a coreless brushless motor. Comprising a main body, one end of the main body is provided with a mounting step, and the other end is concavely provided with a mounting groove for mounting a circuit board and is communicated with the mounting groove through a positioning groove. The main body is of a disc-shaped structure, the mounting step is annular and is provided with an interference strengthening edge and a guide inclined surface, and a bearing mounting seat with a bearing fixing groove and a through hole is further arranged in the center of the mounting step. According to the invention, the assembly precision and stability of the motor are improved, and the installation and maintenance of the circuit board are facilitated.

Description

Technical Field

[0001] This application relates to the field of brushless motor technology, and in particular to a back cover structure for a hollow cup brushless motor. Background Technology

[0002] Coreless brushless motors, as high-performance small electric motors, are widely used in drones, robots, precision instruments, and other fields. These motors are characterized by their small size, light weight, high efficiency, and long lifespan, making them an indispensable core component in many high-tech products. With continuous technological advancements, market demand for coreless brushless motors is constantly increasing, especially regarding their reliability and durability.

[0003] In existing hollow cup brushless motor designs, during long-term operation, the circuit board is prone to displacement or loosening due to factors such as vibration and temperature changes, which can lead to a decrease in motor performance or even failure.

[0004] Therefore, based on the above problems, existing technologies need to be improved. Utility Model Content

[0005] The purpose of this application is to provide a back cover structure for a hollow cup brushless motor.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution: a back cover structure for a hollow cup brushless motor, comprising a main body, one end of the main body being provided with an installation step, the end of the main body away from the installation step being provided with an inwardly recessed installation groove for mounting a circuit board, the main body being provided with a positioning groove, the positioning groove and the installation groove being in communication.

[0007] By adopting the above technical solution, the mounting step at one end of the main body provides a precise fitting structure for the connection between the rear cover and the intermediate sleeve inside the motor housing, ensuring a tight and stable connection, effectively improving the rigidity of the overall motor structure, and reducing the risk of failure caused by loose connections; the recessed mounting groove at the other end of the main body provides a dedicated space for the circuit board, and together with the conductive positioning groove, it can accurately position and firmly clamp the circuit board during installation, greatly reducing the possibility of circuit board displacement or loosening due to factors such as motor vibration and temperature changes, ensuring the stability of the motor's electrical connection, and thus improving the reliability and durability of the hollow cup brushless motor.

[0008] Optionally, the main body has a disc-shaped structure, and the mounting step is annular, with the mounting step arranged along the circumference of one end of the main body.

[0009] By adopting the above technical solution, the disc-shaped main body structure meets the compact design requirements of the motor as a whole, achieving a reasonable layout of various components within a limited space. The annular mounting steps are set along the circumference of one end of the main body, which not only matches the common motor housing sleeve structure and facilitates standardized installation procedures, but also, from a mechanical point of view, this evenly distributed annular structure can evenly bear the axial force, radial force, and impact force generated by vibration during motor operation, distributing external forces evenly to the main body and avoiding local stress concentration that could lead to deformation or damage to the rear cover. This effectively ensures the stability of the rear cover structure and even the entire motor system, laying a solid foundation for the long-term stable operation of the motor.

[0010] Optionally, the mounting step is provided with an interference-strengthened edge.

[0011] By adopting the above technical solution, when fitting the mounting step with the intermediate sleeve of the motor housing, the evenly distributed edges along the circumference moderately increase the outer diameter of the key contact area of ​​the mounting step, forming a stable interference fit. This greatly enhances the friction between the mounting step and the sleeve, ensuring that the back cover will not loosen or shift under various complex operating conditions of the motor, such as high-speed rotation, frequent start-stop, and vibration impact, thus guaranteeing the integrity of the motor structure. Compared to traditional interference fits that rely solely on dimensional tolerances, the reinforced edges provide additional clamping force, further improving the reliability of the connection, reducing the resonance risk caused by minute gap changes in the connection area, making the motor run more smoothly and quietly, and effectively extending the motor's service life.

[0012] Optionally, the interference-strengthened edges are provided in a plurality of form, and the plurality of interference-strengthened edges are evenly distributed along the circumferential direction.

[0013] By adopting the above technical solution, setting several interference-strengthened edges evenly distributed along the circumference allows for a more uniform and stable interference fit between the mounting step and the corresponding sleeve component. During installation, each edge evenly increases the outer diameter of the contact area, ensuring a consistent distribution of clamping force across the entire circumference. This avoids installation difficulties or excessive gaps caused by uneven local forces, thus ensuring a tight fit between the back cover and the motor housing and other related components. During motor operation, the stable clamping force formed by the evenly distributed edges can comprehensively resist the forces generated by motor vibration, centrifugal force, and external impacts, effectively preventing axial and radial displacement or loosening of the back cover. This ensures the accuracy of the relative positions between the internal components of the motor, maximizing the stability of motor operation, and ultimately improving the overall performance and reliability of the motor, enabling it to function stably and efficiently in various application scenarios.

[0014] Optionally, the end of the mounting step away from the main body is provided with a guide ramp.

[0015] By adopting the above technical solution, the guide ramp plays a precise guiding role when assembling the rear cover and the intermediate sleeve of the motor housing. The inclined surface allows the installation step to easily find the correct insertion angle when initially contacting the sleeve, reducing installation difficulty and minimizing the risk of damage to components due to forced assembly, thus greatly improving assembly efficiency. When the rear cover needs to be removed for subsequent maintenance or repair of the motor, the guide ramp also facilitates quick separation, ensuring ease of operation. The precise guiding function ensures the accuracy of the installation process, making the connection between the rear cover and the sleeve tighter and more reliable, avoiding problems such as unstable motor operation and increased vibration caused by installation deviations.

[0016] Optionally, a bearing mounting seat is provided at the center of the main body.

[0017] By adopting the above technical solutions, considering the balance of the mechanical structure, the central position ensures extremely high concentricity between the motor's rotating shaft and the bearing. This results in uniform force distribution on the rotor during operation, significantly reducing additional vibration and noise caused by eccentricity and providing a solid guarantee for smooth motor operation. Simultaneously, it optimizes the internal space of the motor, facilitating a compact and rational arrangement of components around the shaft. This ensures that electrical wiring and mechanical transmission components do not interfere with each other, simplifying wiring and maintenance. Furthermore, the bearing mounting base at the central position can more efficiently transmit and bear radial and axial loads from the rotor, evenly distributing the force to the rear cover body, avoiding localized stress overload, and effectively extending the service life of the rear cover and even the entire motor.

[0018] Optionally, the bearing mounting base is recessed with a bearing fixing groove, and the bottom of the bearing fixing groove is hollow and has a through hole, so that the bearing fixing groove and the mounting groove are connected.

[0019] By adopting the above technical solution, the bearing mounting groove provides a stable and suitable mounting position for the bearing, ensuring that the bearing can still be firmly maintained in the ideal position when rotating at high speed and bearing large radial and axial forces, thus ensuring the smooth operation of the motor shaft and reducing the risk of shaking and displacement.

[0020] Optionally, a guide slope is provided at the opening of the bearing fixing groove.

[0021] By adopting the above technical solution, the bearing installation process can be effectively assisted in smoothly and accurately entering the bearing mounting slot. Its inclined slope allows the bearing to slide slowly into the slot upon initial contact, greatly reducing installation difficulty and preventing damage to the bearing or mounting slot caused by forced insertion. This ensures efficient and damage-free bearing installation. Simultaneously, the precise guiding function guarantees the coaxiality of the bearing installation, allowing the bearing and mounting slot to achieve an ideal fit. This ensures that the rotating shaft remains stably centered during motor operation, reducing eccentric vibrations and increased friction caused by bearing installation deviations. Ultimately, this improves the smoothness and reliability of motor operation and extends the motor's service life.

[0022] In summary, this application has at least the following beneficial effect:

[0023] 1. The mounting step and its auxiliary structures at one end of the rear cover body, such as the interference-strengthened edge and guide bevel, ensure the stability and convenience of the connection with the middle sleeve of the motor housing, effectively resist the vibration and impact during motor operation, prevent the rear cover from loosening and shifting, improve the overall structural rigidity of the motor, and reduce the risk of failure.

[0024] 2. The mounting slot at the other end of the main body, together with the positioning slot, provides precise positioning and reliable fixation for the circuit board, reducing the possibility of circuit board displacement or loosening due to changes in motor operating conditions, ensuring stable electrical connection of the motor, and guaranteeing the reliability and durability of the hollow cup brushless motor in various applications. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the back cover structure of a hollow cup brushless motor;

[0026] Figure 2 This is an assembly diagram of the circuit board;

[0027] Figure 3 This is a schematic diagram of the structure for installing the steps;

[0028] Figure 4 This is a schematic diagram of the back cover structure of a hollow cup brushless motor.

[0029] Figure Labels

[0030] 1. Main body; 2. Mounting step; 3. Mounting groove; 4. Circuit board; 5. Positioning groove; 6. Interference-fit reinforced edge; 7. Bearing mounting seat; 8. Bearing fixing groove; 9. Through hole. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] In this embodiment, refer to Figures 1-4 A rear cover structure for a coreless brushless motor is designed to enhance the stability of the circuit board 4 through a unique design, preventing displacement or loosening due to vibration and temperature changes, thereby improving the reliability and durability of the motor. Specifically, the rear cover structure for a coreless brushless motor includes a main body 1, a mounting step 2, a mounting groove 3, and a positioning groove 5.

[0034] Specifically, the mounting step 2 is located at one end of the main body 1, and has a ring-shaped structure, arranged along the circumference of one end of the main body 1. This makes the rear cover structure more stable when installed on the motor housing, reducing the risk of displacement caused by vibration. The mounting groove 3 is located inside the end of the main body 1 away from the mounting step 2, and is used to install the circuit board 4. The design of the mounting groove 3 not only provides sufficient space to accommodate the circuit board 4, but also enhances the compactness of the structure through its concave shape. The positioning groove 5 is located on the main body 1 and communicates with the mounting groove 3. The function of the positioning groove 5 is to ensure that the circuit board 4 can be accurately aligned during installation, avoid misalignment, improve the convenience of installing the circuit board 4, and further improve the stability of the circuit board 4 installation.

[0035] To further enhance the strength of the mounting step 2, an interference-strengthened edge 6 is provided on the mounting step 2. The interference-strengthened edge 6 can effectively increase the contact area and reduce local stress concentration, thereby improving the vibration resistance of the entire structure. In addition, there are several interference-strengthened edges 6, evenly distributed along the circumference, which can more evenly distribute the pressure and further improve the reliability of the structure.

[0036] In addition, a guide ramp is provided at the end of the mounting step 2 away from the main body 1. The design of the guide ramp simplifies the assembly process, making it easier to insert the rear cover structure into place during installation, while also reducing friction during insertion and removal, thus extending its service life.

[0037] A bearing mounting seat 7 is located at the center of the main body 1. The bearing mounting seat 7 is an important support point, which can not only fix the rotor shaft, but also withstand radial and axial loads to ensure smooth motor operation. The bearing mounting seat 7 has a recessed bearing fixing groove 8 and a hollow bottom forming a through hole 9 to facilitate the insertion of the rotor shaft.

[0038] A guide ramp is provided at the opening of bearing mounting groove 8. The design of the guide ramp facilitates the rapid installation of the bearing, reduces assembly difficulty, and improves production efficiency.

[0039] The implementation principle of this embodiment is as follows: Through various design optimizations, the overall structure significantly improves the stability of the circuit board 4 and the reliability of the motor. In particular, the application of the interference-strengthened edge 6 and the guide bevel not only increases the rigidity of the structure but also facilitates production and maintenance. In addition, the design of the bearing mounting seat 7 greatly improves the operating stability of the motor and extends its service life.

[0040] Example 2

[0041] The difference between this embodiment and the previous one is that the material of the main body 1 is changed to high-strength aluminum alloy. High-strength aluminum alloy has excellent mechanical properties and corrosion resistance, and can be used for a long time in high temperature and high humidity environments without deformation. This material choice not only improves the strength of the structure but also reduces the weight, making it suitable for applications in portable devices and small drones. Secondly, an elastic washer is added to the mounting step 2. The elastic washer is made of rubber or other flexible materials, which can absorb vibration energy during motor operation and reduce the impact transmitted to the circuit board 4. This not only improves the safety of the circuit board 4 but also helps to reduce noise levels and improve the user experience. A dust cover is added to the bearing mounting seat 7. The dust cover is made of wear-resistant plastic, which can effectively block dust and other impurities from entering the bearing area, preventing wear and jamming. This design is particularly suitable for outdoor operating environments, such as agricultural machinery and industrial robots.

[0042] The implementation principle of this embodiment is as follows: By optimizing materials and additional components, this embodiment further improves the overall performance of the rear cover structure. The combined use of high-strength aluminum alloy and elastic washers not only enhances the structural robustness and shock absorption effect but also meets the requirements of lightweight design. The dust cover design effectively protects the bearings from external contamination and extends the service life of the motor.

[0043] Example 3

[0044] The difference between this embodiment and the previous embodiment is that multiple partition plates are added to the mounting slot 3. These partition plates divide the mounting slot 3 into multiple independent spaces, each capable of housing a single circuit board 4. This not only facilitates heat dissipation but also allows for flexible adjustment of the number and layout of the circuit boards 4 to meet diverse needs. A magnet is embedded in the positioning slot 5. The magnet provides additional attraction during circuit board 4 installation, ensuring a secure fit within the mounting slot 3. Especially in high-frequency vibration environments, the magnet effectively prevents the circuit board 4 from falling off, improving system safety. A heat sink is added to the bottom of the bearing mounting base 7. Made of highly efficient thermally conductive material, the heat sink rapidly conducts heat to the outside air, thereby reducing the internal temperature rise of the motor.

[0045] The implementation principle of this embodiment is as follows: the addition of the partition plate provides more installation options. The ingenious application of magnets and heat sinks not only improves the safety and stability of the system, but also optimizes heat dissipation performance.

[0046] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rear cover structure for a hollow cup brushless motor, characterized in that, The device includes a main body (1), one end of which is provided with an installation step (2), and the other end of the main body (1) away from the installation step (2) is provided with an inwardly recessed installation groove (3) for mounting a circuit board (4). The main body (1) is provided with a positioning groove (5), and the positioning groove (5) and the installation groove (3) are connected.

2. The rear cover structure of a hollow cup brushless motor according to claim 1, characterized in that, The main body (1) has a disc-shaped structure, and the mounting step (2) is annular, with the mounting step (2) arranged along the circumferential direction of one end of the main body (1).

3. The rear cover structure of a hollow cup brushless motor according to claim 2, characterized in that, The mounting step (2) is provided with an interference-strengthened edge (6).

4. The rear cover structure of a hollow cup brushless motor according to claim 3, characterized in that, The interference-strengthened edge (6) is provided in a plurality of such edges, and the plurality of interference-strengthened edge (6) are evenly distributed along the circumferential direction.

5. The rear cover structure of a hollow cup brushless motor according to claim 1, characterized in that, The installation step (2) has a guide slope at the end away from the main body (1).

6. The rear cover structure of a hollow cup brushless motor according to claim 1, characterized in that, A bearing mounting seat (7) is provided at the center of the main body (1).

7. The rear cover structure of a hollow cup brushless motor according to claim 6, characterized in that, The bearing mounting base (7) is recessed and has a bearing fixing groove (8). The bottom of the bearing fixing groove (8) is hollow and has a through hole (9). The bearing fixing groove (8) and the mounting groove (3) are connected.

8. The rear cover structure of a hollow cup brushless motor according to claim 7, characterized in that, The bearing fixing groove (8) is provided with a guide slope at the groove opening.

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