A single-arm cantilevered beam motor

Abstract

The application discloses a single-arm cantilever beam structure of a motor, and the single-arm cantilever beam motor comprises a rotor, a support and a stator, one end of the support is provided with a stator mounting groove, the other end of the support is provided with a mounting hole, a cantilever beam connecting assembly is arranged in the mounting hole, the stator is mounted in the stator mounting groove, the rotor is inserted into the cantilever beam connecting assembly, and the rotor corresponds to the stator. The single-arm cantilever beam structure is adopted, so that the overall structure of the motor is simple, the motor is convenient to install and maintain, the concentricity error of the single-arm cantilever beam motor is low during the working process of the motor, noise is low, the motor is suitable for more environmental occasions, and the motor has the advantages of low noise working which the existing double-arm cantilever beam structure motor does not have.

Description

Technical Field

[0001] This invention relates to a single-arm cantilever beam motor, which is applied in the field of machinery. Background Technology

[0002] A cantilever beam is a simplified model used in mechanics of materials for easier calculation and analysis. One end of the cantilever beam is a fixed support, and the other end is a free end. Under load, the support reactions at the fixed end of the cantilever beam, including horizontal force, vertical force, and bending moment, can be obtained according to the force equilibrium conditions. Based on this, axial force diagrams, shear force diagrams, and bending moment diagrams can be drawn.

[0003] Currently, most existing motors adopt a double-arm cantilever structure. The double-arm cantilever structure refers to the bearings in the cantilever beam that support the rotation of the rotor shaft being located at both ends of the rotor shaft. However, in actual use, the bearings at both ends of the double-arm cantilever motor are far apart, which can cause errors in concentricity, resulting in loud noise and inconvenience in use. Summary of the Invention

[0004] In view of the aforementioned problems with existing motors using a double-arm cantilever beam structure, such as high noise and inconvenience during operation, this invention provides a single-arm cantilever beam motor. By adopting a single-arm cantilever beam structure, the overall structure of the motor is simplified, making installation and maintenance convenient. At the same time, during motor operation, the single-arm cantilever beam motor has low concentricity error, resulting in low noise and a wider range of applicable environments. It has the advantage of low-noise operation that existing double-arm cantilever beam structure motors do not possess.

[0005] The technical solution adopted by the present invention to solve its technical problem is as follows: a single-arm cantilever beam motor includes a rotor, a bracket and a stator. One end of the bracket is provided with a stator mounting groove and the other end of the bracket is provided with a mounting hole. A cantilever beam connecting assembly is provided in the mounting hole. The stator is installed in the stator mounting groove and the rotor is inserted into the cantilever beam connecting assembly. The rotor corresponds to the stator.

[0006] Furthermore, the rotor includes a rotor shaft and a magnet, a positioning ring is provided on one side of the magnet, the positioning ring is located between the magnet and the cantilever beam connection assembly, and a shim is provided on the rotor shaft, the shim is located on the other side of the magnet.

[0007] Furthermore, the cantilever beam connection assembly includes a first bearing, a second bearing, a bearing positioning device, and a shaft sleeve. The first bearing, the second bearing, and the bearing positioning device are mounted on the rotor. The bearing positioning device is located between the first bearing and the second bearing. The shaft sleeve is fixedly mounted on the first bearing and the second bearing, and the outer side of the shaft sleeve is fixedly connected to the bracket.

[0008] Furthermore, the bearing positioning device is provided with a spring, the spring is sleeved on the bearing positioning device, and spring washers are provided at both ends of the spring. The spring washers abut against the first bearing and the second bearing, and the two ends of the spring abut against the spring washers.

[0009] Furthermore, the bracket includes a rotor sleeve and a stator mounting bracket, with one or more support beams provided between the rotor sleeve and the stator mounting bracket. The support beams are distributed circumferentially around the rotor sleeve, the mounting holes are provided on the rotor sleeve, and the stator mounting slots are provided on the stator mounting bracket.

[0010] Furthermore, the outer side of the support beam is provided with a reinforcing rib, which is annular and located between the stator mounting bracket and the rotor sleeve. The reinforcing rib is fixedly connected to the support beam.

[0011] Furthermore, the bracket has one or more fixing posts on its inner side, and the stator has fixing holes on its outer side corresponding to the fixing posts. The fixing posts are inserted into the fixing holes, and the stator is fixedly connected to the bracket; or the bracket has one or more fixing holes on its inner side, and the stator has fixing posts on its outer side corresponding to the fixing holes. The fixing posts are inserted into the fixing holes, and the stator is fixedly connected to the bracket.

[0012] Furthermore, the single-arm cantilever beam motor also includes a first air guide duct and a second air guide duct. The first air guide duct has an opening corresponding to the support beam, and the opening is fitted onto the support beam. The first air guide duct is connected to the support beam and is located inside the reinforcing rib. The second air guide duct is located above the first air guide duct and is fixedly connected to the support beam by bolts.

[0013] Furthermore, the support beam is provided with a first chamfer and a second chamfer, the first chamfer corresponding to the first air guide duct and the second chamfer corresponding to the second air guide duct.

[0014] Furthermore, the bracket is provided with air vents around its perimeter, which are located between the reinforcing rib and the stator mounting bracket.

[0015] The beneficial effects of the present invention are as follows: The present invention provides a single-arm cantilever beam motor, which simplifies the overall structure of the motor by adopting a single-arm cantilever beam structure, making it easy to install and maintain. At the same time, during the operation of the motor, the single-arm cantilever beam motor has low concentricity error, resulting in low noise and a wider range of applicable environments. It has the advantage of low noise operation that existing double-arm cantilever beam structure motors do not have. Attached Figure Description

[0016] Figure 1 is an exploded structural diagram of the single-arm cantilever beam motor provided by the present invention;

[0017] Figure 2 is an exploded structural diagram of the cantilever beam connection assembly provided by the present invention;

[0018] Figure 3 is a three-dimensional structural schematic diagram of the single-arm cantilever beam motor provided by the present invention;

[0019] Figure 4 is a cross-sectional structural schematic diagram of the single-arm cantilever beam motor provided by the present invention;

[0020] Figure 5 is a three-dimensional structural schematic diagram of the single-arm cantilever beam motor provided by the present invention;

[0021] Figure 6 is an exploded structural diagram of the single-arm cantilever beam motor provided by the present invention.

[0022] Figure 7 is a structural schematic diagram of the stator and support of the single-arm cantilever beam motor provided by the present invention.

[0023] Figure label:

[0024] 1-Rotor; 11-Rotor shaft; 12-Magnet; 13-Positioning ring; 14-Shim;

[0025] 2-Cantilever beam connection assembly; 21-First bearing; 22-Second bearing; 23-Bearing positioning device; 231-Spring; 232-Spring washer; 24-Shaft sleeve:

[0026] 3-Bracket; 31-Mounting slot; 32-Mounting hole; 33-Rotor sleeve; 34-Stator mounting bracket; 35-Support beam; 351-First support plate; 352-Second support plate; 353-Third support plate; 354-Fourth support plate; 355-First chamfer; 356-Second chamfer; 357-Fifth support plate; 36-Reinforcing rib; 37-Fixing column; 38-Air outlet;

[0027] 4-Stator; 41-Fixing hole;

[0028] 5-First air duct; 51-Opening;

[0029] 6-Second air duct;

[0030] 7- Turbine fan blades. Detailed Implementation

[0031] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] Please refer to Figures 1-7. The single-arm cantilever beam motor provided by the present invention includes a rotor 1, a bracket 3, and a stator 4. One end of the bracket 3 is provided with a stator mounting groove 31, and the stator 4 is installed in the stator mounting groove 31 and connected to the bracket 3. The other end of the bracket 3 is provided with a mounting hole 32, and a cantilever beam connecting assembly 2 is provided in the mounting hole 32. The rotor 1 is inserted into the cantilever beam connecting assembly 2 and connected to the bracket 3. After the rotor 1 is inserted into the cantilever beam connecting assembly 2, one end is placed into the stator 4. The main function of the stator is to generate a rotating magnetic field, while the main function of the rotor is to be cut by magnetic lines of force in the rotating magnetic field and thus generate current. The rotor is a rotating body supported by the cantilever beam connecting assembly 2. The stator 4 is the stationary part, and the rotor 1 is the rotating part. The stator 4 and rotor 1 are important components of the motor. Previously, the cantilever beam connecting assembly 2 of rotor 1 was installed at both ends of the rotor shaft 11. However, because the distance between the two ends of the cantilever beam connecting assembly 2 was too great, it caused concentricity errors, resulting in gaps between the rotor shaft and the cantilever beam connecting assembly 2. This caused vibration of the rotor during high-speed operation, leading to motor imbalance and noise. Therefore, the cantilever beam connecting assembly 2 is now placed at one end of the rotor shaft. This reduces the concentricity error of the components in the cantilever beam connecting assembly 2, reducing motor imbalance and noise generation. The cantilever beam connecting assembly 2 is located at the other end of the bracket and is fixedly connected to the bracket. The stator 4 is installed at the other end of the bracket 3 and fixedly connected to the bracket. In this way, when the rotor is inserted into the cantilever beam connecting assembly 2, the rotor is also placed into the stator, eliminating the need for the cantilever beam connecting assembly 2 at the other end.

[0033] In this embodiment, the rotor 1 includes a rotor shaft 11 and a magnet 12. The rotor shaft 11 houses the cantilever beam connecting assembly 2 and the magnet 12. The cantilever beam connecting assembly 2 is generally made of ferrous metals. Therefore, since the cantilever beam connecting assembly 2 and the magnet 12 are placed on the same shaft, they may attract each other during motor operation. While a normal motor operation may not cause significant damage to the magnet 12 and the cantilever beam connecting assembly 2, persistent friction will eventually lead to damage. If a high-speed motor is running, the magnet and the cantilever beam connecting assembly 2 attracting together will cause substantial damage. High-speed motors typically operate at speeds exceeding 250,000 r / min. The different speeds of the magnet 12 and the cantilever beam connecting assembly 2 increase friction and may also damage other motor components. Therefore, a positioning ring 13 should be provided between the magnet 12 and the cantilever beam connecting assembly 2 to prevent them from attracting together and to prevent the magnet 12 or the cantilever beam connecting assembly 2 from attracting together. To limit the movement and prevent damage to the motor, a gasket 14 is provided on the other side of the magnet 12 to prevent it from falling off the rotor shaft 11. This ensures the relative position of the magnet 12 and the stator and guarantees the normal operation of the motor. It should be noted that the gasket 14 can be selectively installed or not installed according to the actual application situation, and it is not mandatory.

[0034] In this embodiment, the cantilever beam connecting assembly 2 includes a first bearing 21, a second bearing 22, and a bearing positioning device 23. The first bearing 21, the second bearing 22, and the bearing positioning device 23 are mounted on the rotor 1. The bearing positioning device 23 is located between the first bearing 21 and the second bearing 22. The outer sides of the first bearing 21 and the second bearing 22 are fixedly connected to the bracket 3. The first bearing 21, the second bearing 22, and the bearing positioning device 23 are combined to form the cantilever beam connecting assembly 2. Using two bearings makes the entire cantilever beam connecting assembly 2 structurally more stable, which will make the motor more stable during operation. However, the bearings need to be separated. If they are close together, the motor will have poor balance during operation. Therefore, a bearing positioning device 23 needs to be installed between the bearings. The bearing positioning device 23 is used to separate the two bearings. The specific distance between the bearings needs to be determined according to the length of the rotor shaft 1. The distance between the bearings cannot be too far, otherwise the concentricity between the bearings will be difficult to control, which will also lead to the motor's unbalanced operation.

[0035] Preferably, the cantilever beam connecting assembly 2 further includes a shaft sleeve 24, which is fixedly sleeved on the first bearing 21 and the second bearing 22. The outer side of the shaft sleeve 24 is connected to the bracket 3. The shaft sleeve 24 is fixedly sleeved on the bearings to better fix the bearing position and prevent the bearings from moving left and right on the rotor shaft 11 during motor operation, which would cause unstable motor operation and compromise safety. The fixed outer side of the shaft sleeve 24 is fixed to the motor bracket 3, which reduces the concentricity error between the bearings, improves the motor's operational balance, and reduces motor noise. Bearings are important components in the cantilever beam structure, mainly supporting the rotation of the rotor shaft 11, reducing the friction coefficient during its movement, and ensuring its rotational accuracy. However, in previous cantilever beam structures, the bearings were located at both ends of the rotor shaft 11, and the distance between the two bearings was too large, making it difficult to control the concentricity of the two bearings during cantilever beam assembly, resulting in unbalanced motor operation.

[0036] In this embodiment, the cantilever beam connecting assembly 2 can be a wide bearing used to connect the bracket and the rotor. Of course, the cantilever beam connecting assembly 2 can also use more than one or two bearings, or multiple bearings. Multiple bearings can be installed side by side in sequence, or the bearing positioning device 11 can be used to separate the bearings. The use of multiple bearings can also make the motor run more stably, but the manufacturing cost of the entire motor will also increase. The aforementioned bearings can be rolling bearings, self-aligning roller bearings, or self-aligning ball bearings, etc.

[0037] In this embodiment, a spring 231 may be provided on the bearing positioning device 23. The spring 231 is sleeved on the bearing positioning device 23, and its two ends abut against the first bearing 21 and the second bearing 22. However, when the two ends of the spring abut against the bearings, they cannot abut against the inner ring and oil seal of the bearings; they can only abut against the outer ring of the bearings. If the spring abuts against the inner ring, the inner ring will not be able to rotate with the rotor shaft. If it abuts against the oil seal, the purpose of preload will not be achieved. The spring 231 is provided to achieve the purpose of preload. When ball bearings are used in motors, etc., a load is applied in the axial direction to make the radial clearance zero. Preload is applied because when there is radial clearance, the rotational vibration of the balls is large, and the rigidity of the bearing is weakened, resulting in large rotational vibration. The load applied in the axial direction is called preload. The preload is not arbitrarily determined and should be selected according to the size of the bearing. If the preload is too large, the service life will be shortened, and the frictional torque will also increase. If the preload is too low, it will increase vibration, reduce rigidity, and cause fretting wear on the raceway surface. Therefore, setting the preload correctly is crucial when using ball bearings. The so-called surface pressure refers to the value obtained by dividing the vertical component of the force (rolling element load) generated on the contact area between the ball and the raceway groove by the elliptical area when the preload is applied to the ball bearing, causing deformation of the contact area. Spring 231 can have spring washers 232 at both ends. The spring washers 232 abut against the first bearing 21 and the second bearing 22. The purpose of the spring washers 232 is to improve the contact area between the spring and the bearing, increasing the tightening contact area. If the spring and bearing are in direct contact, the contact area may not be large enough during high-speed motor operation, causing the spring to detach from the bearing, thus failing to achieve the desired preload effect.

[0038] In this embodiment, the bracket 3 includes a rotor sleeve 33 and a stator mounting bracket 34. Mounting holes 32 are provided on the rotor sleeve 33, and stator mounting slots 31 are provided on the stator mounting bracket 34. One or more support beams 35 are provided between the rotor sleeve 33 and the stator mounting bracket 34. The support beams 35 connect the rotor sleeve 33 and the stator mounting bracket 34. The support beams 35, rotor sleeve 33, and stator mounting bracket 34 form a bracket 3. The support beams 35 are circumferentially distributed around the rotor sleeve 33, resulting in greater stability. While one support beam can be provided, its stability is insufficient and unsuitable for high-speed motor operation. It is recommended to provide three or more support beams, preferably 2-4, as shown in Figure 1, where there are three support beams 35.

[0039] In this embodiment, a reinforcing rib 36 is provided on the outer side of the support beam 35. The reinforcing rib 36 is annular and is located between the stator mounting bracket 34 and the rotor sleeve 33. The reinforcing rib 36 is fixedly connected to the support beam 35 and is used to further stabilize the support structure.

[0040] In this embodiment, the inner side of the bracket 3 is provided with one or more fixing posts 37, and the outer side of the stator 4 is provided with fixing holes 41 corresponding to the fixing posts 37. The fixing posts 37 are inserted into the fixing holes 41, and the stator 4 is fixedly connected to the bracket 3; or the inner side of the bracket 3 is provided with one or more fixing holes 41, and the outer side of the stator 4 is provided with fixing posts 37 corresponding to the fixing holes 41. The fixing posts 37 are inserted into the fixing holes 41, and the stator 4 is fixedly connected to the bracket 3. Other connection structures can also be used to fix the stator 4 to the bracket 3, such as fixing it with bolts, or the bracket 3 and the stator are integrally formed.

[0041] In this embodiment, the single-arm cantilever beam motor also includes a first air guide duct 5 and a second air guide duct 6. The first air guide duct 5 has an opening 51 corresponding to the support beam 35, and the opening 51 is fitted onto the support beam 35. The first air guide duct 5 is connected to the support beam 35 and is located inside the reinforcing rib 36. The second air guide duct 6 is located above the first air guide duct 5 and is fixedly connected to the support beam 35 by bolts. The function of the air guide ducts is to guide air to the motor for heat dissipation. The first air guide duct 5 has fewer blades than the second air guide duct 6, resulting in better noise reduction.

[0042] In this embodiment, the support beams form a bent structure to facilitate the installation of the rotor, stator, and air duct. Specifically, the support beams include a first support plate 351, a second support plate 352, a third support plate 353, a fourth support plate 354, and a fifth support plate 357. One end of the first support plate 351 is fixedly connected to the rotor sleeve, and the other end of the first support plate 351 is fixedly connected to one end of the second support plate 352. The second support plate 352 is positioned obliquely outward, and the other end of the second support plate 352 is fixedly connected to one end of the third support plate 353. The third support plate 353 is parallel to the rotor sleeve, and the other end of the third support plate 353 is fixedly connected to one end of the fourth support plate 354. The fourth support plate 354 is parallel to the first air duct, and the other end of the fourth support plate 354 is fixedly connected to a reinforcing rib and to one end of the fifth support plate 357. The fifth support plate 357 is parallel to the stator 4. The outer side is fixedly connected. A first chamfer 355 is provided between the third support plate 353 and the fourth support plate 354, and a second chamfer 356 is provided between the first support plate 351 and the second support plate 352. The first chamfer 355 corresponds to the first air guide duct 5, and the second chamfer 356 corresponds to the second air guide duct 6. The first support plate 351, the second support plate 352, the third support plate 353, the fourth support plate 354, the fifth support plate 357, the first chamfer 355, and the second chamfer 356 are used to facilitate the placement of the first air guide duct 5 and the second air guide duct 6, so that the first air guide duct 5 and the second air guide duct 6 can be better connected to the support frame.

[0043] In this embodiment, the bracket 3 is provided with air vents 38 around its perimeter. The air vents 38 are located between the reinforcing rib 36 and the stator mounting bracket 34. When the motor is running, air enters through the air duct, or it can enter or exit through the air vents 38. This allows for faster heat dissipation of the motor. Specifically, whether the air enters or exits through the air vents 38 can be adjusted according to the actual application environment.

[0044] In this embodiment, a single-arm cantilever beam motor with turbine blades 7 is also provided. A turbine blade 7 can be set at one end of the corresponding air duct on the rotor. The single-arm cantilever beam motor with turbine blades 7 is convenient to be applied to intelligent cleaning robots to achieve low-noise operation of intelligent cleaning robots, such as intelligent window cleaning robots, intelligent sweeping robots, intelligent mopping robots, etc.

[0045] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A single-arm cantilever beam motor, characterized in that, The single-arm cantilever beam motor includes a rotor (1), a bracket (3) and a stator (4). One end of the bracket (3) is provided with a stator mounting groove (31), and the other end of the bracket (3) is provided with a mounting hole (32). A cantilever beam connecting assembly (2) is provided in the mounting hole (32). The stator (4) is installed in the stator mounting groove (31), and the rotor (1) is inserted into the cantilever beam connecting assembly (2). The rotor (1) corresponds to the stator (4). The bracket (3) includes a rotor sleeve (33) and a stator mounting bracket (34). One or more support beams (35) are provided between the rotor sleeve (33) and the stator mounting bracket (34). The support beams (35) are distributed circumferentially around the rotor sleeve (33). The mounting hole (32) is provided on the rotor sleeve (33), and the stator mounting groove (31) is provided on the stator mounting bracket (34). The single-arm cantilever beam motor also includes a first air guide duct (5) and a second air guide duct (6). The first air guide duct (5) has an opening (51) corresponding to the support beam (35). The opening (51) is fitted onto the support beam (35). The first air guide duct (5) is connected to the support beam (35). The first air guide duct (5) is placed inside the reinforcing rib (36). The second air guide duct (6) is located above the first air guide duct (5). The second air guide duct (6) is fixedly connected to the support beam (35) by bolts.

2. The single-arm cantilever beam motor according to claim 1, characterized in that, The rotor (1) includes a rotor shaft (11) and a magnet (12). A positioning ring (13) is provided on one side of the magnet (12). The positioning ring (13) is located between the magnet (12) and the cantilever beam connection assembly (2). A shim (14) is provided on the rotor shaft (11). The shim (14) is located on the other side of the magnet (12).

3. The single-arm cantilever beam motor according to claim 1, characterized in that, The cantilever beam connection assembly (2) includes a first bearing (21), a second bearing (22), a bearing positioning device (23), and a shaft sleeve (24). The first bearing (21), the second bearing (22), and the bearing positioning device (23) are mounted on the rotor (1). The bearing positioning device (23) is located between the first bearing (21) and the second bearing (22). The shaft sleeve (24) is fixedly mounted on the first bearing (21) and the second bearing (22). The outer side of the shaft sleeve (24) is fixedly connected to the bracket (3).

4. The single-arm cantilever beam motor according to claim 3, characterized in that, The bearing positioning device (23) is provided with a spring (231), the spring (231) is sleeved on the bearing positioning device (23), and spring washers (232) are provided at both ends of the spring (231). The spring washers (232) abut against the first bearing (21) and the second bearing (22), and the two ends of the spring (231) abut against the spring washers (232).

5. The single-arm cantilever beam motor according to claim 4, characterized in that, The support beam (35) is provided with a reinforcing rib (36) on the outside. The reinforcing rib (36) is annular and is located between the stator mounting bracket (34) and the rotor sleeve (33). The reinforcing rib (36) is fixedly connected to the support beam (35).

6. The single-arm cantilever beam motor according to claim 1, characterized in that, The bracket (3) has one or more fixing posts (37) on its inner side, and the stator (4) has fixing holes (41) on its outer side corresponding to the fixing posts (37). The fixing posts (37) are inserted into the fixing holes (41), and the stator (4) is fixedly connected to the bracket (3); or the bracket (3) has one or more fixing holes (41) on its inner side, and the stator (4) has fixing posts (37) on its outer side corresponding to the fixing holes (41). The fixing posts (37) are inserted into the fixing holes (41), and the stator (4) is fixedly connected to the bracket (3).

7. The single-arm cantilever beam motor according to claim 5, characterized in that, The support beam (35) is provided with a first chamfer (355) and a second chamfer (356). The first chamfer (355) corresponds to the first air guide (5), and the second chamfer (356) corresponds to the second air guide (6).

8. The single-arm cantilever beam motor according to claim 5, characterized in that, The bracket (3) is provided with air vents (38) around its perimeter, and the air vents (38) are located between the reinforcing rib (36) and the stator mounting bracket (34).

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