Brushless outer rotor motor

Abstract

The utility model discloses a brushless external rotor motor, which belongs to the field of driving devices, solves the problem that a driving shaft is easy to damage in the prior art, and adopts the technical scheme that the brushless external rotor motor mainly comprises a body and a supporting seat, the body comprises a driving shaft, a rotor shell connected to the driving shaft and a stator located between the driving shaft and the rotor shell, a first damping piece is arranged on the rotor shell, a detachably connected second damping piece is arranged on the supporting seat, the first damping piece can synchronously rotate along with the rotor shell, and the second damping piece can synchronously rotate along with the rotor shell. And in the rotating process of the rotor shell, the first damping piece can be rubbed with the second damping piece mounted on the supporting seat to generate damping force. The self-locking device is mainly used for guaranteeing the service life of the driving shaft while guaranteeing the self-locking performance of the motor.

Description

Technical Field

[0001] This utility model relates to the field of drive devices, and in particular to a brushless external rotor motor. Background Technology

[0002] A brushless external rotor motor includes a drive shaft, a rotor housing connected to the drive shaft, and a stator located between the drive shaft and the rotor housing. For applications requiring rapid braking or to prevent slippage, the motor needs to have a braking self-locking function. For example, utility model patent CN212412959U discloses a method that includes a friction element that cooperates with the drive shaft and an elastic element for keeping the friction element in contact with the drive shaft. The friction force between the friction element and the drive shaft is greater than or equal to the torque of the drive shaft after the motor body is de-energized. However, since the drive shaft is always in frictional contact with the friction element, the drive shaft is prone to wear after long-term use, and replacing the drive shaft is also difficult. The concentricity of the rotation of the damaged drive shaft will be disrupted, causing the motor to vibrate during operation. Utility Model Content

[0003] The purpose of this invention is to provide a brushless external rotor motor that solves the problem of easy damage to the drive shaft in the prior art, ensuring the self-locking performance of the motor while ensuring the service life of the drive shaft.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a brushless external rotor motor, comprising a body and a support base, wherein the body is rotatably mounted on the support base, the body comprising a drive shaft, a rotor housing connected to the drive shaft, and a stator located between the drive shaft and the rotor housing, wherein a first damping element is provided on the rotor housing, and a second damping element is provided on the support base. The first damping element can rotate synchronously with the rotor housing, and during the rotation of the rotor housing, the first damping element can rub against the second damping element mounted on the support base to generate a damping force.

[0005] After adopting the above technical solution, the present invention has the following advantages: The motor generates damping force through the friction between the first damping component on the rotor housing and the second damping component on the support base, which avoids direct contact between the drive shaft and the friction component as much as possible, thereby effectively reducing the wear of the drive shaft and ensuring the service life of the drive shaft. Secondly, the second damping component on the support base is detachably connected, and if the second damping component is worn or damaged, it is relatively convenient to replace, reducing the maintenance cost and difficulty of the motor. The second damping component can also be selectively installed or removed, which can provide sufficient braking force to ensure safety or meet specific operating requirements when needed, and reduce unnecessary friction loss when not needed.

[0006] Furthermore, the second damping element is telescopically mounted on the support base to adjust the distance between the second damping element and the first damping element.

[0007] By employing the above technical solution, the frictional force generated between the second and first damping components can be flexibly controlled without replacing any parts, thus achieving precise adjustment of the damping force. This allows the motor to dynamically adjust the braking force according to different operating requirements, improving the system's adaptability and flexibility. When high damping force is not required, increasing the distance between the second and first damping components reduces their contact and wear, helping to extend the service life of related components.

[0008] Furthermore, the support base is provided with a through hole penetrating the support base, and the second damping element moves closer to or further away from the first damping element through the through hole.

[0009] Using the above technical solution, the second damping element moves through a through hole. The through hole can guide the movement of the second damping element, ensuring that it can move accurately in a predetermined direction when it approaches or moves away from the first damping element, thereby ensuring the accuracy of the distance adjustment between the second damping element and the first damping element.

[0010] Furthermore, the second damping element includes a damping block and a support column for supporting the damping block, the support column being movably disposed on the damping block via a threaded connection structure; or, the second damping element includes a damping block and a support column for supporting the damping block, the support column having at least two members, the two support columns being threadedly connected to adjust the height of the damping block; or, the second damping element includes a positioning pin, a damping block, and a support column for supporting the damping block, the support column having at least two members, the at least two support columns being sleeved on each other, the support column having multiple positioning holes, the positioning pin being inserted into the positioning holes on the two support columns to fix the two support columns.

[0011] By employing the above technical solution and using a threaded connection structure, precise movement of the support column on the damping block can be achieved, thereby more accurately adjusting the distance between the damping block and the first damping element, and achieving more precise control of the damping force. The threaded connection has good self-locking performance, which can prevent the support column from moving unexpectedly due to vibration or other reasons during motor operation, ensuring the stability of the damping block position, and thus ensuring the stability of the damping force. Alternatively, by using threaded connections of multiple support columns, a wider range of height adjustment of the damping block can be achieved, better adapting to different braking needs and installation space requirements. The threaded connection has good self-locking performance, which can prevent the support column from moving unexpectedly due to vibration or other reasons during motor operation, ensuring the stability of the damping block position, and thus ensuring the stability of the damping force. Alternatively, by inserting locating pins into locating holes at different positions, the sleeve length of the support column can be quickly adjusted, thereby rapidly changing the height of the damping block.

[0012] Furthermore, the support base also includes support feet located on both sides of the support base, and the support feet form an operating space for operating the support column.

[0013] By adopting the above technical solution, a dedicated operating space is formed between the support legs, allowing operators to more easily approach and adjust the position of the support column.

[0014] Furthermore, the second damping element is movably mounted on the support base via a threaded engagement structure.

[0015] Using the above technical solution, the position of the second damping element can be easily adjusted by rotation, without the need for complicated tools or skills, making the operation simple and quick. The threaded fit structure provides relatively stable support, ensuring that the second damping element remains in the desired position after adjustment and will not shift due to vibration or other external forces.

[0016] Furthermore, the rotor housing includes a rigid frame, and the outer side of the rigid frame is wrapped with an outwardly protruding plastic part or a flexible coating, the plastic part or the flexible coating forming the first damping element.

[0017] By adopting the above technical solution, the rigid frame provides the necessary structural strength and stability, ensuring the overall robustness and durability of the rotor housing as much as possible. The rigid frame can withstand various forces during motor operation without deformation. Using plastic parts or flexible rubber coating as the first damping element can provide better friction performance. The plastic parts or flexible rubber coating have a certain elasticity and shock absorption capacity, which can absorb some vibration and noise during operation, helping to improve the smoothness and quietness of motor operation.

[0018] Furthermore, the first damping element is disposed at the middle position of the rigid frame, and the second damping element is disposed at the middle position of the first damping element.

[0019] By adopting the above technical solution, the arrangement in the middle position helps to maintain the overall center of gravity balance of the motor, which can ensure that the force and friction generated during operation can be more evenly distributed on the rotor shell and support structure. Especially when rotating at high speed, this design can reduce vibration and noise caused by imbalance and improve the smoothness and reliability of motor operation.

[0020] Furthermore, the first damping element includes a damping ring disposed on the outside of the rotor housing, and the second damping element is provided with a circular or arc-shaped damping surface adapted to the damping ring.

[0021] By adopting the above technical solution, the circular or arc-shaped damping surface can better fit the damping ring, increasing the actual contact area and thus improving the damping effect.

[0022] Furthermore, at least two second damping elements are provided, the damping surfaces of the at least two second damping elements have different roughnesses, and one of the at least two second damping elements is selectively installed on the support.

[0023] Using the above technical solution, damping surfaces with different roughness will generate different frictional forces with the damping ring of the first damping component, thereby providing different magnitudes of damping force. Since the second damping component is detachable from the support base, by selecting and installing different second damping components, the magnitude of the damping force can be flexibly adjusted according to the specific operating requirements and conditions of the motor, so as to achieve better braking effect and operating stability. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the brushless external rotor motor in this utility model;

[0026] Figure 2 This is a cross-sectional view of the brushless external rotor motor of this utility model;

[0027] Figure 3 This is a structural schematic diagram of the brushless external rotor motor in this utility model from another perspective.

[0028] Figure 4 This is a cross-sectional view of the brushless external rotor motor of this utility model from another perspective;

[0029] In the figure, 10 is the main body; 11 is the drive shaft; 12 is the rotor housing; 121 is the rigid frame; 13 is the stator; 20 is the support base; 21 is the through hole; 22 is the support foot; 23 is the operating space; 30 is the first damping element; 301 is the damping ring; 31 is the second damping element; 311 is the damping block; 312 is the support column; and 313 is the damping surface. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0031] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein.

[0032] It should be understood that in the various embodiments of this utility model, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this utility model.

[0033] It should be understood that in this invention, "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0034] It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0035] The technical solution of this utility model will be described in detail below with specific embodiments. The following specific embodiments can be selected to be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0036] like Figures 1 to 4 As shown, this utility model provides a brushless external rotor motor for driving the movement of loads, mainly used in industrial robotic arms. The brushless external rotor motor includes a body 10 and a support base 20. The body 10 is rotatably mounted on the support base 20. The body 10 includes a drive shaft 11, a rotor housing 12 connected to the drive shaft 11, and a stator 13 located between the drive shaft 11 and the rotor housing 12. The rotor housing 12 is provided with a first damping element 30, and the support base 20 is provided with a detachably connected second damping element 31. The first damping element 30 can rotate synchronously with the rotor housing 12, and during the rotation of the rotor housing 12, the first damping element 30 can rub against the second damping element 31 mounted on the support base 20 to generate a damping force.

[0037] The motor generates damping force through friction between the first damping element 30 on the rotor housing 12 and the second damping element 31 on the support base 20, which avoids direct contact between the drive shaft 11 and the friction element as much as possible, thereby effectively reducing the wear of the drive shaft 11 and ensuring its service life. Secondly, the second damping element 31 on the support base 20 is detachably connected, so if the second damping element 31 is worn or damaged, it is relatively easy to replace, reducing the maintenance cost and difficulty of the motor. The second damping element 31 can also be selectively installed or removed to provide sufficient braking force to ensure safety or meet specific operating requirements when needed, and to reduce unnecessary friction loss when not needed.

[0038] It should be noted that a brushless motor also includes permanent magnets, armature windings, position sensors, and an electronic controller. The permanent magnets are mounted on the inner surface of the rotor housing 12, providing a magnetic field. The armature windings (coils) are conductive coils fixed to the stator 13; when current flows through these coils, they generate an electromagnetic field that interacts with the permanent magnets on the rotor to produce rotational motion. The position sensor detects the rotor's position, providing signals to the electronic controller to precisely control the energizing sequence and timing of the stator 13 windings, achieving efficient motor operation. Common position sensors include Hall effect sensors. The electronic controller (inverter) is a crucial component of the brushless motor; it converts DC power to AC power and adjusts the current direction and magnitude based on information from the position sensor to ensure the brushless motor operates as needed.

[0039] Since different working scenarios may require different braking forces, in this application, the second damping element 31 is telescopically mounted on the support base 20 to adjust the distance between the second damping element 31 and the first damping element 30. By adjusting the distance between the second damping element 31 and the first damping element 30, the magnitude of the friction force generated between them can be flexibly controlled without replacing parts, thereby achieving precise adjustment of the damping force. This allows the motor to dynamically adjust the braking force according to different working requirements, improving the adaptability and flexibility of the system. When high damping force is not required, increasing the distance between the second damping element 31 and the first damping element 30 can reduce their contact and wear, and also help extend the service life of related components.

[0040] Furthermore, at least two second damping elements 31 are provided, and the damping surfaces 313 of the at least two second damping elements 31 have different roughnesses. One of the at least two second damping elements 31 is selectively mounted on the support 20. The damping surfaces 313 with different roughnesses will generate different frictional forces with the damping ring 301 of the first damping element 30, thereby providing different magnitudes of damping force. Since the second damping elements 31 are detachable from the support 20, by selecting and installing different second damping elements 31, the magnitude of the damping force can be flexibly adjusted according to the specific operating requirements and conditions of the motor to achieve better braking effect and operational stability. For example, in cases requiring rapid braking, a second damping element 31 with a larger damping surface 313 roughness can be selected to increase the damping force and shorten the braking time; while in cases requiring high operational smoothness and not requiring a large damping force, a second damping element 31 with a smaller roughness can be selected.

[0041] It should be noted that the second damping element 31 can be set to three, four, five, or other quantities.

[0042] To facilitate adjustment, the support base 20 is provided with a through hole 21 that passes through the support base 20. The second damping member 31 moves closer to or further away from the first damping member 30 through the through hole 21. The through hole 21 can guide the movement of the second damping member 31 to ensure that it can move accurately in a predetermined direction when it moves closer to or further away from the first damping member 30, thereby ensuring the accuracy of the distance adjustment between the second damping member 31 and the first damping member 30.

[0043] It should be noted that the support base 20 forms a channel for supporting the body 10. Of course, in other embodiments, the support base 20 can also be U-shaped. The open design of the U-shaped support base 20 allows air to circulate freely, which helps to improve heat dissipation efficiency and makes it easier to install and disassemble.

[0044] It should be noted that the support base 20 can have one through hole 21 to install one second damping element 31, or two through holes 21 to install two second damping elements 31, thereby increasing the damping force and the self-locking force of the motor.

[0045] Specifically, the second damping element 31 includes a damping block 311 and a support column 312 for supporting the damping block 311. The support column 312 is movably mounted on the damping block 311 through a threaded engagement structure. The threaded engagement structure enables precise movement of the support column 312 on the damping block 311, thereby more accurately adjusting the distance between the damping block 311 and the first damping element 30, achieving more precise control of the damping force. The threaded connection has good self-locking performance, which can prevent the support column 312 from moving unexpectedly due to vibration or other reasons during motor operation, ensuring the stability of the position of the damping block 311, and thus ensuring the stability of the damping force.

[0046] It should be noted that the support column 312 is provided with a threaded section, and the damping block 311 is provided with a threaded hole, which can be adjusted by rotating the support column 312.

[0047] It should be noted that the support column 312 needs to be supported on the ground or other support structure. The support base 20 also includes support feet 22 located on both sides of the support column 312. The support feet 22 form an operating space 23 for operating the support column 312, so that the operator can more easily approach and adjust the position of the support column 312.

[0048] The rotor housing 12 includes a rigid frame 121, which provides the necessary structural strength and stability, ensuring the overall robustness and durability of the rotor housing 12. The rigid frame 121 can withstand various forces during motor operation without deformation. The rigid frame 121 is wrapped with an outwardly protruding plastic component, which forms a first damping component 30, providing better friction performance. The plastic component has a certain degree of elasticity and shock absorption capacity, absorbing some vibration and noise during operation, thus helping to improve the smoothness and quietness of motor operation.

[0049] Furthermore, the first damping element 30 is positioned at the middle of the rigid frame 121, and the second damping element 31 is positioned at the middle of the first damping element 30. This middle-position arrangement helps maintain the overall center of gravity balance of the motor, ensuring that the forces and friction generated during operation are more evenly distributed on the rotor housing 12 and the support structure. Especially at high speeds, this design reduces vibration and noise caused by imbalance, improving the smoothness and reliability of motor operation.

[0050] The first damping element 30 includes a damping ring 301 disposed on the outer side of the rotor housing 12, and the second damping element 31 has a circular damping surface 313 adapted to the damping ring 301. During the rotation of the rotor housing 12, the damping surface 313 is always in contact with the damping ring 301. The circular damping surface 313 can better fit the damping ring 301, increasing the actual contact area and thus improving the damping effect. Of course, the damping surface 313 can also be arc-shaped, depending on the structural shape of the damping ring 301.

[0051] Understandably, in other embodiments, the second damping element includes a damping block and support columns for supporting the damping block. There are at least two support columns, which are threaded together to adjust the height of the damping block. The threaded connection of multiple support columns allows for a wider range of height adjustment of the damping block, better adapting to different braking needs and installation space requirements. The threaded connection has good self-locking performance, preventing accidental movement of the support columns due to vibration or other reasons during motor operation, ensuring the stability of the damping block's position, and thus ensuring the stability of the damping force. There can be two or three support columns.

[0052] Understandably, in other embodiments, the second damping element includes a locating pin, a damping block, and support columns for supporting the damping block. There are at least two support columns, which are interlocked. Each support column has multiple locating holes. The locating pin inserts into the locating holes on the two support columns to fix them in place, allowing for quick adjustment of the interlocking length of the support columns, thereby rapidly changing the height of the damping block. There may also be three or four support columns, etc. The locating holes are spaced apart along the length of the support columns.

[0053] Understandably, in other embodiments, the second damping element is movably mounted on the support via a threaded engagement structure. The position of the second damping element can be easily adjusted by rotation, requiring no complex tools or skills, making operation simple and quick. The threaded engagement structure provides robust support, ensuring that the second damping element remains in the desired position after adjustment and does not shift due to vibration or other external forces.

[0054] Understandably, the rigid frame is wrapped with an outwardly protruding flexible coating, which forms the first damping element. As a damping material, the flexible coating can effectively absorb and dissipate vibration energy, reducing vibrations generated during operation. This helps protect internal components from wear and damage caused by vibration, while also reducing noise. The flexible coating is generally made of high-molecular polymer materials such as rubber, polyurethane (PU), and silicone. These materials possess good elasticity and flexibility, effectively absorbing vibration and impact energy.

[0055] Understandably, in other embodiments, the first damping element can also be located at the front or rear end of the rotor housing, and the position of the second damping element can be adjusted accordingly to better utilize the space at the front or rear end of the rotor housing, making the brushless external rotor motor structure more compact.

[0056] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A brushless external rotor motor, characterized in that, The device includes a body and a support base. The body is rotatably mounted on the support base. The body includes a drive shaft, a rotor housing connected to the drive shaft, and a stator located between the drive shaft and the rotor housing. The rotor housing is provided with a first damping element, and the support base is provided with a detachably connected second damping element. The first damping element can rotate synchronously with the rotor housing, and during the rotation of the rotor housing, the first damping element can rub against the second damping element mounted on the support base to generate a damping force.

2. The brushless external rotor motor according to claim 1, characterized in that, The second damping element is telescopically mounted on the support base to adjust the distance between the second damping element and the first damping element.

3. A brushless external rotor motor according to claim 2, characterized in that, The support base is provided with a through hole, through which the second damping element approaches or moves away from the first damping element.

4. A brushless external rotor motor according to claim 3, characterized in that, The second damping element includes a damping block and a support column for supporting the damping block. The support column is movably disposed on the damping block through a threaded engagement structure. Alternatively, the second damping element includes a damping block and a support column for supporting the damping block. There are at least two support columns, and the two support columns are threadedly connected to each other to adjust the height of the damping block. Alternatively, the second damping element includes a positioning pin, a damping block, and a support column for supporting the damping block. There are at least two support columns, and the at least two support columns are sleeved together. The support column has multiple positioning holes, and the positioning pin is inserted into the positioning holes on the two support columns to fix the two support columns.

5. A brushless external rotor motor according to claim 4, characterized in that, The support base also includes support feet located on both sides of the support column, and the support feet form an operating space for operating the support column.

6. A brushless external rotor motor according to claim 1, characterized in that, The second damping element is movably mounted on the support base via a threaded connection structure.

7. A brushless external rotor motor according to claim 1, characterized in that, The rotor housing includes a rigid frame, and the outer side of the rigid frame is wrapped with an outwardly protruding plastic part or a flexible coating, which forms the first damping element.

8. A brushless external rotor motor according to claim 7, characterized in that, The first damping element is located at the middle position of the rigid frame, and the second damping element is located at the middle position of the first damping element.

9. A brushless external rotor motor according to claim 1, characterized in that, The first damping element includes a damping ring disposed on the outside of the rotor housing, and the second damping element is provided with a circular or arc-shaped damping surface adapted to the damping ring.

10. A brushless external rotor motor according to claim 9, characterized in that, The second damping element is provided in at least two parts, the damping surfaces of the at least two second damping elements have different roughnesses, and one of the at least two second damping elements is installed on the support.

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