A brushless motor vibration damping mechanism and motor

Abstract

This invention provides a vibration damping mechanism for a brushless motor, disposed inside the motor, including an adapter. The adapter includes a connecting part and an adapter portion. The connecting part is used to connect to an external device. A connecting boss is protruding from the outer surface of the adapter portion, and the connecting boss is used to connect to the motor. The connecting boss has a spacing section. This invention solves the technical problem of direct vibration propagation caused by rigid contact between the motor and the adapter in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor vibration reduction technology, and more specifically to a brushless motor vibration reduction mechanism and motor. Background Technology

[0002] Currently, the UAV industry widely uses external rotor brushless motors as the power core. The rotor directly drives the rotor rotation, while the stator assembly is fixed to the arm structure via rigid connectors. In traditional designs, the adapter connecting to the shaft has a continuous surface contact between its outer surface and external components. This results in a large effective area for vibration transmission and high rigid coupling strength, allowing the mechanical vibration energy generated by the motor stator or rotor to be efficiently transmitted directly to the external device through the adapter. This continuous contact structure cannot effectively impede high-frequency vibration waves. The continuous transmission of high-frequency vibration waves on the continuous contact surface amplifies periodic vibration excitation due to energy accumulation, reducing the structural vibration resistance of the external device and causing significant noise interference, affecting the operational reliability of the equipment under dynamic conditions. Furthermore, altering the connection structure of the adapter to reduce vibration can easily compromise the reliability of the connection and assembly stability, sacrificing the overall mechanical integrity of the mechanism, making it difficult to achieve a balance between vibration reduction and structural stability. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide a brushless motor vibration damping mechanism and motor, which aims to solve the problem of direct vibration diffusion caused by rigid contact between the motor and the adapter in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A brushless motor vibration damping mechanism is disposed inside the motor and includes an adapter. The adapter includes a connecting part and an adapter part. The connecting part is used to connect to an external device. A connecting boss is provided on the outer surface of the adapter part. The connecting boss is used to connect to the motor. The connecting boss is provided with a gap section.

[0006] In one embodiment, the connecting boss includes a plurality of protrusions, and the interval segment is disposed between two adjacent protrusions.

[0007] In one embodiment, a plurality of the protrusions are arranged in a circumferential array along the transition portion.

[0008] In one embodiment, the protrusion extends along the height direction of the transition portion.

[0009] In one embodiment, a plurality of the protrusions are spaced apart along the height direction of the transition portion.

[0010] In one embodiment, the protrusion is arranged around the outer surface of the transition portion.

[0011] In one embodiment, the relative height between the upper surface of the connecting boss and the outer surface of the adapter is 0.2-0.5 mm.

[0012] In one embodiment, the outer surface of the connecting boss is coated with a damping coating.

[0013] An electric motor includes the aforementioned vibration damping mechanism, and further includes a rotor body, a stator assembly, and a rotating shaft. The stator assembly is nested outside the connecting boss, the rotor body is nested outside the stator assembly, and the rotating shaft is fixedly connected to the bottom of the rotor body and passes through the adapter.

[0014] In one embodiment, the adapter has a rolling bearing inside, the outer ring of the rolling bearing is connected to the adapter, and the inner ring of the rolling bearing is connected to the rotating shaft.

[0015] The advantages of this invention compared to existing technologies are as follows: The connecting boss on the outer surface of the adapter has a spacer section, which divides the contact area between the connecting boss and the motor into multiple discrete local contact points, thereby significantly reducing the effective area for vibration transmission and the rigid coupling strength. This reduces the direct propagation efficiency of mechanical vibration energy through the adapter to the external device fixed to the connecting part, causing high-frequency vibration waves to be reflected and scattered at the spacer section. This achieves physical isolation and selective attenuation of periodic vibration excitation, avoiding the cumulative amplification of vibration energy on continuous contact surfaces. Simultaneously, this structural design maintains connection reliability and assembly stability, without sacrificing the overall mechanical integrity of the mechanism due to vibration reduction requirements. Ultimately, it improves the structural vibration resistance of the external device, reduces noise interference, and enhances the operational reliability of the equipment under dynamic operating conditions.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the adapter for a brushless motor vibration damping mechanism provided by this utility model;

[0018] Figure 2 A schematic diagram of the planar structure of the adapter of a brushless motor vibration damping mechanism provided by this utility model;

[0019] Figure 3 A schematic diagram of the overall structure of an electric motor provided by this utility model;

[0020] Figure 4 This is a schematic diagram of the planar structure of an electric motor provided by this utility model.

[0021] Figure Labels

[0022] 1. Rotor body; 2. Stator assembly; 21. Stator core; 211. Tooth; 212. Slot; 3. Adapter; 31. Connecting part; 32. Adapter; 33. Connecting boss; 331. Protrusion; 332. Spacing section. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0028] See Figures 1 to 2As shown in the figure, this utility model embodiment discloses a brushless motor vibration damping mechanism, which is disposed inside the motor and includes an adapter 3. The adapter 3 includes a connecting part 31 and an adapter part 32. The connecting part 31 is used to connect to an external device. The outer surface of the adapter part 32 is provided with a connecting boss 33. The connecting boss 33 is used to connect to the motor. The connecting boss 33 is provided with a spacing section 332.

[0029] Specifically, in this embodiment, a brushless motor vibration damping mechanism is disposed inside the motor and includes an adapter 3. The adapter 3 includes a connecting portion 31 for connecting to an external device and an adapter portion 32 with a connecting boss 33 protruding from its outer surface. The connecting boss 33 is used to connect to the motor, and a spacer segment 332 is provided on the connecting boss 33. The spacer segment 332 on the connecting boss 33 divides the contact area between the connecting boss 33 and the motor into multiple discrete local contact points, reducing the effective area and rigid coupling strength of vibration transmission. This reduces the propagation efficiency of the mechanical vibration energy generated by the motor from the connecting boss 33 to the adapter 3 and then to the external device, causing high-frequency vibration waves to be reflected and scattered at the spacer segment 332. This achieves physical isolation and selective attenuation of periodic vibration excitation, while maintaining connection reliability and assembly stability. When the motor vibrates, the vibration is transmitted to the adapter 3 through the connecting boss 33. Due to the presence of the spacer segment 332 on the connecting boss 33, the effective area of ​​vibration transmission is reduced, and high-frequency vibration waves are reflected and scattered, reducing the vibration transmission to the external device.

[0030] In one embodiment, the connecting boss 33 includes a plurality of protrusions 331, and the spacing segment 332 is disposed between two adjacent protrusions 331.

[0031] Specifically, in this embodiment, the connecting boss 33 includes a plurality of protrusions 331, and a spacer 332 is disposed between two adjacent protrusions 331. The protrusions 331 form clearly defined discrete contact points, and the spacer 332 between adjacent protrusions 331 enhances the discreteness of the contact area, further reducing the vibration transmission area, enhancing the reflection and scattering effect of vibration waves, and improving vibration damping performance. When the vibration of the motor is transmitted to the connecting boss 33, it is transmitted to the transfer part 32 through the protrusions 331. The spacer 332 between adjacent protrusions 331 blocks the continuous transmission of vibration, causing the vibration energy to be dispersed and attenuated. It is understood that the protrusions 331 can be cylindrical or other irregular shapes, as long as they can form adjacent spacers 332; no specific limitation is made in this embodiment.

[0032] In one embodiment, a plurality of the protrusions 331 are arranged in a circumferential array along the transition portion 32.

[0033] Specifically, a plurality of protrusions 331 are evenly arrayed along the circumference of the transition portion 32, with the center of the array coinciding with the axis of rotation. The circumferentially arrayed protrusions 331 ensure even distribution of contact points in the circumferential direction, guaranteeing balanced force transmission and preventing localized vibration concentration. Simultaneously, the evenly distributed intervals 332 allow vibration waves to be effectively reflected and scattered in all directions, improving vibration damping stability. When the vibration of the motor is transmitted to the periphery of the connecting boss 33, the circumferential array of the protrusions 331 affects the transmission of vibration in all directions due to the intervals 332, causing the vibration energy to be evenly dispersed and attenuated in the circumferential direction. It is understood that in other embodiments, the protrusions 331, while meeting the stability requirements of the motor's static support, can also be arranged at non-equidistant angles according to actual needs.

[0034] Furthermore, the protrusion 331 extends along the height direction of the transition portion 32.

[0035] Specifically, in this embodiment, the protrusion 331 is a short columnar structure, and the connecting boss 33 is composed of several short columnar protrusions 331 arranged in a circumferential array. The short columnar protrusions 331 can reduce the contact area of ​​a single protrusion 331 while ensuring the stability of contact with the motor. Combined with the circumferential array arrangement, the vibration transmission points are evenly distributed in the circumferential direction, avoiding local vibration concentration. At the same time, the short columnar structure extending along the height direction can cover a certain height range, allowing vibrations at different heights to be reflected and scattered by the intervals 332 between adjacent protrusions 331, further improving the vibration reduction effect.

[0036] In one embodiment, a plurality of the protrusions 331 are spaced apart along the height direction of the transition portion 32.

[0037] Specifically, in this embodiment, several protrusions 331 are arranged in layers at intervals along the height direction of the transition portion 32, with each layer of protrusions 331 forming an independent annular array, and the layers are isolated by longitudinal intervals 332. This segmented support in the height direction disperses the axial vibration transmission path and increases the vibration wave reflection interface. During operation, the low-frequency vibrations generated by the axial movement of the rotor are reflected multiple times by the intervals 332, resulting in multiple attenuations of the vibration energy. It is understood that in other embodiments, a helical array arrangement can also be used, but the load-bearing balance of each layer of protrusions 331 must be maintained.

[0038] In one embodiment, the protrusion 331 is arranged around the outer surface of the adapter 32.

[0039] Specifically, in this embodiment, the protrusion 331 is an annular transverse rib structure, and the connecting boss 33 is composed of several such annular transverse ribs. The annular transverse ribs, as the protrusion 331, can form a continuous annular contact area in the circumferential direction. The connecting boss 33, composed of several annular transverse ribs, can form a stable connection with the motor through multiple annular contact surfaces, ensuring sufficient connection strength. When the vibration generated by the motor is transmitted to the adapter 32, it is transmitted through the connecting boss 33 composed of several annular transverse ribs. While the annular transverse ribs bear the connection force to ensure the connection strength with the motor, the intervals 332 between adjacent annular transverse ribs reflect and scatter the vibration in the height direction, causing the vibration energy to gradually attenuate and reducing the transmission of vibration to external devices.

[0040] In one embodiment, the relative height between the upper surface of the connecting boss 33 and the outer surface of the adapter 32 is 0.2-0.5 mm.

[0041] Specifically, in this embodiment, the relative height between the top surface of the connecting boss 33 and the outer surface of the adapter 32 is limited to 0.2 to 0.5 mm. This size range ensures that the motor and the outer surface of the connecting boss 33 form a stable interference fit, and ensures that there is sufficient contact area between the connecting boss 33 and the motor to maintain connection reliability and stability.

[0042] In one embodiment, the outer surface of the connecting boss 33 is coated with a damping coating.

[0043] Specifically, the outer surface of the connecting boss 33 is coated with a damping coating. This coating absorbs vibration energy through its viscosity and elasticity, converting mechanical energy into heat energy for dissipation. Working in conjunction with the spacer segment 332, it enhances the vibration attenuation effect, especially for high-frequency vibrations. When vibration is transmitted to the connecting boss 33, the damping coating deforms due to the vibration, consuming the vibration energy. Simultaneously, the spacer segment 332 reflects and scatters the vibration wave, further reducing the vibration energy transmitted to external devices. It is understood that in this embodiment, the damping coating is preferably a rubber film or damping sheet.

[0044] See Figures 3 to 4 As shown, an electric motor is disclosed. The electric motor includes the vibration damping mechanism as described above, as well as a rotor body 1, a stator assembly 2 and a rotating shaft. The stator assembly 2 is nested outside the connecting boss 33, the rotor body 1 is nested outside the stator assembly 2, and the rotating shaft is fixedly connected to the bottom of the rotor body 1 and passes through the adapter 3.

[0045] Specifically, in this embodiment, a motor has a core structure comprising an adapter 3, a rotor body 1, a stator assembly 2, and a shaft. The stator assembly 2 is nested outside a connecting boss 33. The shaft is fixedly connected to the bottom of the rotor body 1 and passes through the adapter 3. The rotor body 1 is nested outside the stator assembly 2, forming a concentric layered layout. The connecting boss 33 enables partial contact and fixation between the adapter 32 and the inner ring of the stator assembly 2. In other words, by replacing the traditional full-surface contact of the adapter 32 with the connecting boss 33, the vibration energy of the stator assembly 2 is transmitted to the adapter 3 only through the connecting boss 33, significantly reducing the rigid coupling area. During operation, when the shaft drives the rotor body 1 to rotate, the radial electromagnetic vibration generated by the stator assembly 2 is physically isolated by the connecting boss 33. The vibration transmission path is simplified from surface contact to point contact, thereby reducing the structural noise transmitted to external devices.

[0046] Furthermore, the stator assembly 2 includes a stator core 21 and a coil winding. The stator core 21 is provided with a plurality of teeth 211 distributed circumferentially, and a wire groove 212 is formed between each of the teeth 211. The coil winding is embedded in the wire groove 212.

[0047] Specifically, the stator assembly 2 consists of a stator core 21 and coil windings. The stator core 21 is stamped to form radially distributed teeth 211 along the circumference. The gaps between the teeth 211 form slots 212. The coil windings are embedded in the slots 212 and their ends are interconnected to form an energized circuit. Relying on the concentrated magnetic induction intensity of the teeth 211, the coil windings generate an alternating magnetic field after being energized, which drives the rotor permanent magnet to rotate through the gaps between the teeth 211. During operation, the teeth 211 convert electromagnetic force into radial mechanical vibration, while the structure of the slots 212 constrains the vibration modes, preventing the windings from loosening and aggravating high-frequency noise. It is understood that in this embodiment, the slots 212 adopt an open design, but in other embodiments, a closed slot design can also be used, but the heat dissipation performance of the windings must be ensured.

[0048] It is understood that the number of protrusions 331 is equal to the number of grooves 212.

[0049] Specifically, in this embodiment, the number of protrusions 331 is equal to the number of slots 212 in the stator assembly 2, and the axial projection position of each protrusion 331 corresponds to the center of a slot 212, thereby aligning the vibration transmission point with the electromagnetic force excitation source space and preventing bending resonance from occurring inside the stator core 21. During operation, the pulsating force generated by the teeth 211 when the coil winding is energized is directly transmitted through the corresponding protrusion 331, shortening the transmission chain and suppressing vibration amplification caused by phase interference.

[0050] Understandably, the rotor body 1 and the shaft are rigidly connected by an interference fit, thereby ensuring that the rotor and shaft maintain zero relative displacement under high-speed rotation and avoiding secondary vibration caused by dynamic imbalance. During operation, the interference fit interface transmits the electromagnetic driving force to the shaft without loss, while suppressing the micro-slippage of the mating surface caused by centrifugal force.

[0051] In one embodiment, the adapter 3 is provided with a rolling bearing inside, the outer ring of the rolling bearing is connected to the adapter 3, and the inner ring of the rolling bearing is connected to the rotating shaft.

[0052] Specifically, the connector contains a rolling bearing. The outer ring of the rolling bearing is connected to the adapter 3, and the inner ring is connected to the shaft. The rolling bearing reduces the frictional resistance between the shaft and the adapter 3, making the shaft rotate more smoothly. Simultaneously, its structure absorbs and buffers vibrations transmitted from the motor to the shaft and then to the adapter 3. Working in conjunction with the spacer section 332 on the connecting boss 33, it suppresses vibration at its source, improving overall vibration damping performance. When the shaft rotates, the inner ring of the rolling bearing drives the outer ring to rotate, reducing friction. When vibrations from the motor are transmitted to the shaft, the rolling bearing buffers the vibrations, weakening those transmitted to the adapter 3 before further attenuation via the spacer section 332 on the connecting boss 33.

[0053] In summary, the brushless motor vibration damping mechanism and motor of this embodiment, through the partial connection between the connecting boss 33 protruding from the outer surface of the adapter 32 and the stator assembly 2, significantly reduces the contact area and rigid coupling strength between the stator assembly 2 and the adapter 3, thereby effectively isolating the direct transmission path of electromagnetic or mechanical vibrations generated during motor operation to external devices. This design utilizes the circumferentially distributed protrusions 331 to disperse vibration energy, and applies a damping coating to the surface of the boss to further absorb high-frequency vibrations. At the same time, the bearing cooperation between the adapter 3 and the shaft ensures rotational stability, ultimately achieving significant attenuation of the overall structural vibration of the UAV, avoiding resonance risks, and improving the measurement accuracy of flight control systems such as IMU sensors and the overall reliability of the aircraft.

[0054] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A brushless motor vibration damping mechanism, disposed inside the motor, characterized in that, The adapter includes a connecting part and a transfer part. The connecting part is used to connect to an external device. A connecting boss is provided on the outer surface of the transfer part. The connecting boss is used to connect to the motor. A gap section is provided on the connecting boss.

2. A brushless motor damping mechanism according to claim 1, wherein The connecting boss includes a plurality of protrusions, and the interval is provided between two adjacent protrusions.

3. A brushless motor damping mechanism according to claim 2, wherein Several of the protrusions are arranged in a circumferential array along the transition portion.

4. A brushless motor damping mechanism according to claim 3, wherein The protrusion extends along the height direction of the transition portion.

5. A brushless motor damping mechanism according to claim 2, wherein Several of the protrusions are spaced apart along the height direction of the transition portion.

6. A brushless motor damping mechanism according to claim 5, wherein The protrusion is arranged around the outer surface of the transition portion.

7. A brushless motor damping mechanism according to claim 1, wherein The relative height between the upper surface of the connecting boss and the outer surface of the adapter is 0.2-0.5 mm.

8. A brushless motor damping mechanism according to claim 1, wherein The outer surface of the connecting boss is coated with a damping coating.

9. An electric machine characterized by The motor includes a vibration damping mechanism as described in any one of claims 1-8, and further includes a rotor body, a stator assembly, and a rotating shaft. The stator assembly is nested outside the connecting boss, the rotor body is nested outside the stator assembly, and the rotating shaft is fixedly connected to the bottom of the rotor body and passes through the adapter.

10. An electric machine according to claim 9, characterized in that The adapter is equipped with a rolling bearing inside, the outer ring of the rolling bearing is connected to the adapter, and the inner ring of the rolling bearing is connected to the rotating shaft.

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