A car model motor

Abstract

The utility model relates to a kind of car model motor, including front support, stator assembly, rotor assembly, rear mounting ring, end cover and hall component, front support and rear mounting ring are respectively fixed at the both ends of stator assembly, end cover or hall component is fixed, and clamped in the both sides of rear mounting ring, rotor assembly is set in stator assembly, and both ends are respectively rotatably connected with front support and hall component, stator assembly includes stator core and winding coil fixed in stator core, the one end of stator core is also fixed with support ring, PCB board is also fixed in support ring, PCB board is connected with winding coil, and wiring copper bar is also fixed on PCB board, wiring copper bar extends out of support ring, and the end of wiring copper bar is equipped with C-shaped bayonet joint. The C-shaped bayonet joint of the utility model can clamp external power cord, facilitate subsequent welding operation, and C-shaped bayonet joint can play the role of auxiliary fixing wiring, reduce the risk of wiring loosening and separation, and connection is more reliable and stable.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor for a car model. Background Technology

[0002] As a type of miniature DC motor specifically designed to power remote-controlled model cars, the performance of the motor directly determines the acceleration, top speed, and handling response of the model car. With the continuous improvement of the competitive level of model car racing and enthusiasts' pursuit of ultimate performance, increasingly higher requirements are being placed on the power density, reliability, heat dissipation efficiency, and ease of assembly and maintenance of model car motors.

[0003] In existing model car motors, the connection between the winding coil leads and the external power supply line is usually achieved through direct soldering or simple terminal connections. This method has several obvious drawbacks: First, the three-phase leads of the motor lack positioning insertion holes, making soldering difficult, and the solder joints are prone to fatigue fracture under high-frequency vibration, leading to poor contact or open circuits, resulting in poor reliability; second, the leads are messily arranged inside the motor, not only taking up space and affecting structural compactness, but also potentially causing insulation damage due to friction with rotating parts or the housing, leading to short circuit risks; third, when the motor needs to be replaced or repaired, the disassembly and reconnection of the wiring is cumbersome, requiring a certain level of soldering skill from the operator, and is inconvenient for quick maintenance.

[0004] Furthermore, the installation method of Hall effect sensors in existing model car motors is relatively simple. Hall effect sensors are usually fixed on a circuit board, with only one sensing interface and a fixed orientation. This limits the flexibility of motor layout in different frame structures. For example, when the frame space is limited or the wiring path is specific, the fixed-oriented Hall effect interface may lead to excessive cable bending or make installation impossible.

[0005] In terms of structural fixation, existing car model motors typically connect their components using multiple scattered fasteners, resulting in complex assembly processes and difficulty in ensuring centering. This can affect the uniformity of the air gap between the rotor and stator, thereby impacting motor efficiency and generating additional noise. Simultaneously, the motor generates significant heat during high-speed operation. Existing heat dissipation structures are often inefficient, leading to heat accumulation internally. This can cause magnet demagnetization and winding insulation aging, ultimately shortening motor lifespan and limiting sustained peak power output.

[0006] In addition, the way the PCB (printed circuit board) used to connect circuits (such as windings and Hall elements) inside the existing model car motor is fixed is also crucial. If it is not fixed securely, the PCB may shift or loosen under strong vibration, causing damage to the components soldered on it or breakage of the connecting lines.

[0007] In summary, existing model car motors still require improvement in areas such as the reliability of electrical connections, the flexibility of structural layout, the ease of assembly and maintenance, and heat dissipation performance. Therefore, there is an urgent need for a novel model car motor design to address one or more of the aforementioned technical issues. Utility Model Content

[0008] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a compact, convenient and robust car model motor.

[0009] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0010] A model car motor includes a front bracket, a stator assembly, a rotor assembly, a rear mounting ring, an end cover, and a Hall effect sensor. The front bracket and the rear mounting ring are respectively fixed to both ends of the stator assembly. The end cover or Hall effect sensor is fixed and clamped on both sides of the rear mounting ring. The rotor assembly is disposed inside the stator assembly, and its two ends are rotatably connected to the front bracket and the Hall effect sensor, respectively. The stator assembly includes a stator core and a winding coil fixed in the stator core. A support ring is also fixed to one end of the stator core. A PCB board is also fixed inside the support ring. The PCB board is connected to the winding coil, and a copper busbar is also fixed on the PCB board. The copper busbar extends out of the support ring, and the end of the copper busbar is provided with a C-shaped bayonet.

[0011] As a preferred embodiment: the Hall assembly includes a Hall support frame and an upper Hall plate and a lower Hall plate respectively fixed to the upper and lower end faces of the Hall support frame. The upper Hall plate and the lower Hall plate are connected by a line passing through the Hall support frame. The upper Hall plate is provided with two Hall interfaces, and the two Hall interfaces face the side and the end face respectively.

[0012] As a preferred embodiment: the Hall support frame is further provided with a raised edge, the inner wall of the rear mounting ring is further provided with a pressure ring, the end cap and the Hall support frame are respectively located on both sides of the rear mounting ring, and after being fixed by bolts, the pressure ring abuts against the raised edge.

[0013] As a preferred embodiment: the inner wall of the support ring is provided with an inner convex ring, and the PCB board is provided with multiple protrusions around its perimeter, the protrusions resting on the inner convex ring.

[0014] As a preferred embodiment: the PCB board is further provided with an arc-shaped insulating end block, and the rear mounting ring is provided with a notch that matches the insulating end block, and the insulating end block is embedded in the notch.

[0015] As a preferred embodiment, the rotor assembly includes a magnetic ring and a rotating shaft inserted inside the magnetic ring, wherein a balance block is fixed to one end of the magnetic ring on the rotating shaft.

[0016] As a preferred embodiment: one end of the rotating shaft is rotatably connected to the front bracket via a bearing, the Hall support frame has a through hole in the middle, and the other end of the rotating shaft is rotatably connected to the through hole of the Hall support frame via a bearing.

[0017] As a preferred embodiment, the rear mounting ring is fastened to the front bracket by a long bolt that passes through the support ring and the stator core.

[0018] As a preferred embodiment, the front bracket, support ring, end cap, and rear mounting ring are all provided with multiple heat dissipation holes.

[0019] As a preferred embodiment, the copper busbar is fixed to the PCB board by rivets.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention features a C-shaped clamp on the copper busbar, allowing external power cables to be firmly positioned by inserting and clamping them, facilitating subsequent soldering operations. The C-shaped clamp also helps secure the wiring, reducing the risk of loosening and detachment, resulting in a more reliable and stable connection. Furthermore, by integrating the electrical connection points of the winding coils from scattered wire ends onto a single PCB board, the circuit is standardized and organized. This eliminates the unreliable factors such as cold solder joints and broken wires inherent in traditional manual soldering, significantly improving the stability and consistency of electrical connections. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 3 and Figure 4 These are two different exploded structural diagrams of this utility model.

[0026] The markings in the diagram are as follows: 11. Front bracket; 12. Support ring; 121. Inner convex ring; 21. Stator core; 22. Winding coil; 23. Terminal block; 31. PCB board; 32. Connecting copper busbar; 33. C-shaped bayonet; 34. Insulating end block; 41. Shaft; 42. Magnetic ring; 43. Balance block; 44. Bearing; 13. Rear mounting ring; 131. Pressure ring; 51. Hall support frame; 52. Upper Hall plate; 53. Protruding edge; 54. Hall interface; 55. Lower Hall plate; 14. End cap; 6. Long bolt. Detailed Implementation

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, 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 application pertains.

[0028] 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 this application. 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.

[0029] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0034] like Figures 1 to 4 As shown, a car model motor includes a front bracket 11, a stator assembly, a rotor assembly, a rear mounting ring 13, an end cover 14, and a Hall effect sensor. The front bracket 11 and the rear mounting ring 13 are respectively fixed to both ends of the stator assembly. The end cover 14 or the Hall effect sensor is fixed and clamped on both sides of the rear mounting ring 13. The rotor assembly is disposed inside the stator assembly, and its two ends are rotatably connected to the front bracket 11 and the Hall effect sensor, respectively. The stator assembly includes a stator core 21 and a winding coil 22 fixed in the stator core 21. A support ring 12 is also fixed to one end of the stator core 21. A PCB board 31 is also fixed inside the support ring 12. The PCB board 31 is connected to the winding coil 22, and a copper busbar 32 is also fixed on the PCB board 31. The copper busbar 32 is fixed to the PCB board 31 by rivets. The copper busbar 32 extends out of the support ring 12, and the end of the copper busbar 32 is provided with a C-shaped bayonet 33.

[0035] The aforementioned structure integrates the PCB board and wiring terminals inside the support ring, making full use of the motor's axial space. This results in a more compact motor structure, avoids messy external wiring, and facilitates the motor's layout within the frame, achieving both structural compactness and space optimization. Simultaneously, the support ring provides a robust protective enclosure for the fragile PCB board and electrical connection points, effectively preventing damage caused by accidental collisions or tool contact during assembly, transportation, or use.

[0036] The Hall assembly includes a Hall support frame 51 and an upper Hall plate 52 and a lower Hall plate 55 respectively fixed to the upper and lower end faces of the Hall support frame 51. The upper Hall plate 52 and the lower Hall plate 55 are connected by a line passing through the Hall support frame 51. The upper Hall plate 52 is provided with two Hall interfaces 54, and the two Hall interfaces 54 face the side and the end face respectively.

[0037] The aforementioned structure divides the Hall effect circuit board into upper and lower sections, allowing for more flexible design and wiring, and making it easier to adapt to different internal spaces. Simultaneously, this structure provides two Hall effect sensor interfaces (sockets) in different directions, allowing users to choose the most convenient and space-saving interface direction for connection based on the actual space and wiring requirements within the vehicle frame. This solves the problems that traditional single-direction interfaces may cause, such as excessive cable bending, interference with other components, or installation difficulties.

[0038] The Hall support frame 51 is also provided with a raised edge 53, and the inner wall of the rear mounting ring 13 is also provided with a pressure ring 131. The end cap 14 and the Hall support frame 51 are located on both sides of the rear mounting ring 13, and are fixed by bolts so that the pressure ring 131 abuts against the raised edge 53. Through the cooperation of the raised edge and the pressure ring, the Hall component is accurately axially positioned and firmly clamped on the rear mounting ring. This surface contact clamping method is more stable than point contact or small area contact, and can effectively prevent the Hall component from loosening or displacing during vibration. Since the air gap between the Hall element and the rotor magnetic ring is crucial to the signal detection accuracy, the above-mentioned stable fixing method ensures that the air gap remains constant during motor operation, thereby ensuring the quality of the Hall signal and the stability of motor control.

[0039] The inner wall of the support ring 12 is provided with an inner convex ring 121, and the PCB board 13 is provided with multiple protrusions around its perimeter, which rest on the inner convex ring 121. This provides a clear and easy-to-operate mounting reference for the PCB board. Assembly workers can easily align the protrusions of the PCB board and place it on the inner convex ring to complete the initial positioning without the need for additional tooling fixtures.

[0040] The PCB board 13 also has an arc-shaped insulating end block 34, and the rear mounting ring 13 has a notch that matches the insulating end block 34, with the insulating end block 34 embedded in the notch. This structure solves the problem of circumferential rotation of the PCB board, preventing it from twisting due to vibration or electromagnetic force and ensuring that the copper busbars on it always maintain the correct orientation. Furthermore, during assembly, the fit between the insulating end block and the notch acts as a guide and confirmation structure, helping the operator quickly align the entire stator assembly with the rear mounting ring, improving assembly efficiency and accuracy.

[0041] The rotor assembly includes a magnetic ring 42 and a shaft 41 inserted within the magnetic ring 42. A balance block 43 is also fixed to one end of the magnetic ring 42 on the shaft 41. When the motor rotates at high speed, even slight mass unevenness can lead to huge centrifugal forces, causing severe vibration and noise. Adding a balance block means that the rotor has undergone precise dynamic balancing correction during manufacturing. This can significantly reduce vibration and noise during motor operation, improve running smoothness, extend bearing life, and help increase the maximum safe speed of the motor. One end of the shaft 41 is rotatably connected to the front bracket 11 via a bearing 44. The Hall support frame 51 has a through hole in the middle, and the other end of the shaft 41 is rotatably connected to the through hole of the Hall support frame 51 via a bearing 44. The "simply supported beam" structure with bearings at both ends greatly improves the rigidity and stability of the rotor compared to a cantilever beam structure. This ensures that the rotor maintains a uniform air gap with the stator when rotating at high speed, avoiding the risk of rotor rubbing (rotor-stator friction). Furthermore, the bearing positions on the precision-machined front bracket and Hall support frame ensure the concentricity of the two bearings, thereby further ensuring smooth rotor operation and reducing friction loss and vibration.

[0042] The rear mounting ring 13 is fastened to the front bracket 11 by long bolts 6 that pass through the support ring 12 and the stator core 21. Using a single or a few long bolts to fasten the main structural components forms a robust overall frame, greatly improving the overall structural rigidity and deformation resistance of the motor. This continuous fastening method automatically aligns the front bracket, stator core, support ring, and rear mounting ring, ensuring concentricity between components, simplifying the assembly process, and improving product consistency and quality.

[0043] The front bracket 11, support ring 12, end cover 14, and rear mounting ring 13 are all equipped with multiple heat dissipation holes. These holes on several key components of the motor create effective air convection channels. Internal heat (mainly from winding copper losses and core iron losses) can be dissipated to the external environment more quickly. Better heat dissipation means the motor can operate at higher power for extended periods without overheating, improving its continuous output capability and reliability, and preventing magnet demagnetization or insulation damage due to high temperatures.

[0044] In summary, the pre-reserved positioning insertion holes for the terminals of the three-phase motor lead welding of this utility model make welding convenient and quick, solving the difficulties in welding three-phase motor leads, improving production efficiency, and reducing production costs. In addition, the motor of this invention has two Hall effect lead insertion interfaces, which meet the needs of customers so that the Hall effect leads can be led out from two different directions after the motor is installed, making it convenient for customers to organize the overall wiring harness.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A car model motor, comprising a front bracket (11), a stator assembly, a rotor assembly, a rear mounting ring (13), an end cap (14), and a Hall effect sensor, wherein the front bracket (11) and the rear mounting ring (13) are respectively fixed to both ends of the stator assembly, and the end cap (14) or the Hall effect sensor is fixed and clamped on both sides of the rear mounting ring (13), the rotor assembly is disposed within the stator assembly, and both ends are rotatably connected to the front bracket (11) and the Hall effect sensor, respectively, and the stator assembly comprises a stator core (21) and a winding coil (22) fixed in the stator core (21), characterized in that: One end of the stator core (21) is also fixed with a support ring (12), and a PCB board (31) is also fixed inside the support ring (12). The PCB board (31) is connected to the winding coil (22), and a wiring copper busbar (32) is also fixed on the PCB board (31). The wiring copper busbar (32) extends out of the support ring (12), and the end of the wiring copper busbar (32) is provided with a C-shaped bayonet (33).

2. The car model motor according to claim 1, characterized in that: The Hall assembly includes a Hall support frame (51) and an upper Hall plate (52) and a lower Hall plate (55) fixed to the upper and lower end faces of the Hall support frame (51) respectively. The upper Hall plate (52) and the lower Hall plate (55) are connected by a line passing through the Hall support frame (51). The upper Hall plate (52) is provided with two Hall interfaces (54), and the two Hall interfaces (54) face the side and the end face respectively.

3. A car model motor according to claim 2, characterized in that: The Hall support frame (51) is also provided with a raised edge (53), and the inner wall of the rear mounting ring (13) is also provided with a pressure ring (131). The end cap (14) and the Hall support frame (51) are located on both sides of the rear mounting ring (13), and after being fixed by bolts, the pressure ring (131) abuts against the raised edge (53).

4. A car model motor according to claim 1, characterized in that: The inner wall of the support ring (12) is provided with an inner protruding ring (121), and the PCB board (13) is provided with multiple protrusions around its perimeter, the protrusions resting on the inner protruding ring (121).

5. A car model motor according to claim 1, characterized in that: The PCB board (13) is also provided with an arc-shaped insulating end block (34), and the rear mounting ring (13) is provided with a notch that matches the insulating end block (34), and the insulating end block (34) is embedded in the notch.

6. A car model motor according to claim 2, characterized in that: The rotor assembly includes a magnetic ring (42) and a rotating shaft (41) inserted inside the magnetic ring (42). A balance block (43) is also fixed to one end of the magnetic ring (42) on the rotating shaft (41).

7. A car model motor according to claim 6, characterized in that: One end of the rotating shaft (41) is rotatably connected to the front bracket (11) through a bearing (44), and the Hall support frame (51) has a through hole in the middle. The other end of the rotating shaft (41) is rotatably connected to the through hole of the Hall support frame (51) through a bearing (44).

8. A car model motor according to claim 1, characterized in that: The rear mounting ring (13) is fastened to the front bracket (11) by a long bolt (6) that passes through the support ring (12) and the stator core (21).

9. A car model motor according to claim 1, characterized in that: The front bracket (11), support ring (12), end cap (14) and rear mounting ring (13) are all provided with multiple heat dissipation holes.

10. A car model motor according to claim 1, characterized in that: The copper busbar (32) is fixed to the PCB board (31) by rivets.

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