Hollow steel tube shaft outer rotor brushless motor

Abstract

The utility model discloses a hollow steel pipe axle outer rotor brushless motor, its characterized in that: including hollow steel pipe axle, the hollow steel pipe axle both ends are through bearing and are provided with rotor casing, is provided with stator bobbin on the hollow steel pipe axle between two bearings, is provided with coil on stator bobbin, is provided with lead hole on the hollow steel pipe axle between one bearing and stator bobbin, is provided with mounting sleeve in rotor casing, is provided with permanent magnet magnetic pole in the corresponding position of mounting sleeve and stator bobbin, is provided with connecting screw thread respectively in the both ends of hollow steel pipe axle. The utility model discloses a purpose to overcome the deficiency in the prior art, provide a kind of hollow steel pipe axle outer rotor brushless motor with simple structure, easy to install, can effectively prevent the wobble of rotating process.

Description

Technical Field

[0001] This utility model relates to the field of ceiling fan technology, specifically to a hollow steel tube shaft external rotor brushless motor. Background Technology

[0002] With the continuous development of technology and the market, fans on the market are trending towards miniaturization, with compact motor placement being a key development focus. Most current fan motors use brushless motors and incorporate hollow tube shafts to save space. However, most of these hollow tube shafts currently lack sufficient strength, and after a period of use, they are prone to loosening between the shaft and the bearings, causing the fan to wobble during rotation. Furthermore, current hollow tube shafts generally require screws at the end for connection to other components, which not only demands high precision in machining and fitting but also results in higher costs.

[0003] Therefore, the existing external rotor brushless motors need further improvement. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a hollow steel tube shaft external rotor brushless motor with a simple structure, convenient installation, and effective prevention of shaking during rotation.

[0005] To achieve the above objectives, this utility model adopts the following solution: a hollow steel tube shaft external rotor brushless motor, characterized in that: it includes a hollow steel tube shaft, rotor housings are respectively provided at both ends of the hollow steel tube shaft via bearings, a stator winding frame is provided on the hollow steel tube shaft between the two bearings, a coil is wound on the stator winding frame, a lead wire hole is provided on the hollow steel tube shaft between one of the bearings and the stator winding frame, an mounting sleeve is provided inside the rotor housing, permanent magnet poles are provided at corresponding positions of the mounting sleeve and the stator winding frame, and connecting threads are respectively provided at both ends of the hollow steel tube shaft.

[0006] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, a first positioning retaining ring and a second positioning retaining ring are spaced apart on the outer wall of the hollow steel tube shaft, the lead wire hole is located between the first positioning retaining ring and the second positioning retaining ring, the outer side of one of the bearings abuts against the first positioning retaining ring, the inner side of the stator winding frame abuts against the second positioning retaining ring, a positioning ring platform is provided on the outer wall of the hollow steel tube shaft outside the stator winding frame, and the inner side of the other bearing abuts against the positioning ring platform.

[0007] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, a keyway is provided on the hollow steel tube shaft at the connecting thread.

[0008] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, reinforcing long ribs that can increase strength are provided at intervals along the length direction on the inner wall of the hollow steel tube shaft.

[0009] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, the rotor housing includes a front housing and a rear housing that cover each other.

[0010] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, a fan blade connecting part is provided on the outer wall of the front housing, and a screw thread is provided on the outer wall of the fan blade connecting part.

[0011] As another improvement of the hollow steel tube shaft external rotor brushless motor of this utility model, the front housing includes a front housing body, a first receiving groove is provided on the rear side of the front housing body, the mounting sleeve is provided in the first receiving groove, a second receiving groove is provided on the front side of the front housing body, and the bearing is provided in the second receiving groove.

[0012] As another improvement of the hollow steel tube shaft external rotor brushless motor of this utility model, the rear housing includes a rear housing body, an assembly round seat is provided at the center of the rear side of the rear housing body, a plurality of connecting arms are evenly distributed along the circumferential direction between the assembly round seat and the rear housing body, an assembly groove is provided in the assembly round seat, and one of the bearings is provided in the assembly groove.

[0013] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, multiple L-shaped reinforcing ribs are provided at intervals on the inner wall of the connecting arm.

[0014] As another improvement to the hollow steel tube shaft external rotor brushless motor of this utility model, a positioning step is provided on the rear end of the front shell body, the front end of the rear shell body abuts against the positioning step, a plurality of first connecting posts are evenly spaced on the outer wall of the rear end of the front shell body, a second connecting post is provided on the outer wall of the front end of the rear shell body at a position corresponding to the first connecting post, connecting screws are provided in the first and second connecting posts, and a shock-absorbing groove is provided on the outer wall of the front shell body at a position corresponding to the first connecting post.

[0015] In summary, the advantages of this utility model compared to the prior art are as follows: 1. This utility model has a simple structure. Connecting threads are provided at both ends of the hollow steel tube shaft, facilitating direct connection with external mechanisms, reducing additional adapter parts, lowering assembly complexity, and effectively reducing costs. 2. The hollow steel tube shaft has high strength, is not easily worn, and has a tight connection with the bearing, preventing shaking during use. 3. A fan blade connecting part is provided on the outer wall of the front housing, and screw threads are provided on the outer wall of the fan blade connecting part. The fan blades can be quickly installed or removed. Attached Figure Description

[0016] Figure 1 This is one of the perspective schematic diagrams of an embodiment of the present utility model.

[0017] Figure 2 This is a second perspective view of an embodiment of the present utility model.

[0018] Figure 3 for Figure 1 A cross-sectional schematic diagram.

[0019] Figure 4 This is one of the three-dimensional schematic diagrams of the hollow steel tube shaft of this utility model.

[0020] Figure 5 This is a three-dimensional schematic diagram of the front housing of this utility model.

[0021] Figure 6 This is a three-dimensional schematic diagram of the rear shell of this utility model.

[0022] Figure 7 This is the second three-dimensional schematic diagram of the hollow steel tube shaft of this utility model.

[0023] In the diagram: 1. Hollow steel tube shaft; 11. First positioning retaining ring; 12. Second positioning retaining ring; 13. Positioning ring platform; 14. Keyway; 15. Strong long rib; 2. Bearing; 3. Rotor housing; 31. Front housing; 300. Screw thread; 310. Fan blade connection part; 311. Front housing body; 312. First receiving groove; 313. Second receiving groove; 314. Positioning step; 315. First connecting post; 316. Vibration damping groove; 32. Rear housing; 321. Rear housing body; 322. Assembly round seat; 323. Connecting arm; 324. Assembly groove; 325. L-shaped reinforcing rib; 326. Second connecting post; 4. Stator winding frame; 5. Coil; 6. Lead hole; 7. Mounting sleeve; 8. Permanent magnet pole; 9. Connecting thread; 10. Connecting screw. Detailed Implementation

[0024] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0025] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0026] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0027] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0028] like Figure 1-7 As shown, a hollow steel tube shaft external rotor brushless motor includes a hollow steel tube shaft 1. Rotor housings 3 are respectively mounted on both ends of the hollow steel tube shaft 1 via bearings 2. A stator winding frame 4 is mounted on the hollow steel tube shaft 1 between the two bearings 2, and coils 5 are wound on the stator winding frame 4. A lead wire hole 6 is provided on the hollow steel tube shaft 1 between one of the bearings 2 and the stator winding frame 4. An mounting sleeve 7 is provided inside the rotor housing 3. Permanent magnet poles 8 are provided on the mounting sleeve 7 at corresponding positions to the stator winding frame 4. Connecting threads 9 are respectively provided at both ends of the hollow steel tube shaft 1. In this invention, the hollow steel tube shaft 1 can be made of high-strength alloy steel, such as 42CrMo, 304 stainless steel, or titanium alloy. The hardness and fatigue resistance are improved through quenching and tempering heat treatment, ensuring that it is not easily deformed under high-speed rotation or load impact.

[0029] In this utility model, the stator winding frame 4 is tightly connected to the hollow steel tube shaft 1. Since the internal cavity of the hollow steel tube shaft 1 can serve as an airflow channel, natural convection heat dissipation is formed during high-speed rotation, effectively improving heat dissipation efficiency.

[0030] In this invention, a spiral guide groove or heat dissipation fin can be added to the inner wall of the hollow steel pipe shaft to further improve heat dissipation efficiency.

[0031] In this utility model, the bearing 2 and the outer wall of the hollow steel tube shaft 1 are interference-fitted.

[0032] The hollow steel tube shaft of this invention has high strength, is not easily worn, and has a tight connection with the bearing, so it will not shake during use.

[0033] The hollow steel tube shaft 1 of this utility model is provided with connecting threads 9 at both ends, which facilitates direct connection with external mechanisms, reduces additional adapter parts, reduces assembly complexity, and effectively reduces costs.

[0034] In this invention, a keyway 14 is provided at the connecting thread 9 on the hollow steel pipe shaft 1. After the hollow steel pipe shaft 1 is connected to an external component via the thread, a flat key can be installed in the keyway 14, which can effectively prevent axial displacement in a vibrating environment and improve reliability. In this invention, the length of the keyway 14 exceeds the threaded section by 5-10mm to ensure sufficient contact area between the key and the groove. The end of the keyway adopts a rounded transition to effectively reduce stress peaks.

[0035] See Figure 4 In this utility model, a first positioning retaining ring 11 and a second positioning retaining ring 12 are spaced apart on the outer wall of the hollow steel tube shaft 1. The lead wire hole 6 is located between the first positioning retaining ring 11 and the second positioning retaining ring 12. The outer side of one of the bearings 2 abuts against the first positioning retaining ring 11, and the inner side of the stator winding frame 4 abuts against the second positioning retaining ring 12. A positioning ring platform 13 is provided on the outer wall of the hollow steel tube shaft 1 outside the stator winding frame 4, and the inner side of the other bearing 2 abuts against the positioning ring platform 13.

[0036] In this invention, the axial positioning of the bearing and stator winding frame is achieved by the first positioning retaining ring 11, the second positioning retaining ring 12 and the positioning ring platform 13, while the lead hole 6 is restricted between the two retaining rings to ensure the safety of the wire routing.

[0037] In this invention, when the motor starts, stops, or reverses, the bearing impact force is shared by the retaining ring 11 and the ring platform 13.

[0038] See Figure 1-3 According to points 5-6, the rotor housing 3 of this utility model includes a front housing 31 and a rear housing 32 that overlap each other. The split design not only facilitates the separate processing of the front and rear housings during manufacturing, reducing the difficulty and cost of overall manufacturing, but also allows for easy separation of the front and rear housings during subsequent assembly, maintenance, and repair, improving operational convenience. When it is necessary to inspect, replace, or repair internal components, simply opening the connection between the front and rear housings allows direct access to the internal parts, greatly saving time and effort.

[0039] See Figure 5In this invention, a fan blade connecting part 310 is provided on the outer wall of the front housing 31, and a screw thread 300 is provided on the outer wall of the fan blade connecting part. The design of the fan blade connecting part 310 provides a dedicated interface for the installation of the fan blade, enabling the fan blade to be accurately and stably connected to the front housing 31. The screw thread 300 further enhances the reliability and stability of the connection. Through the threaded connection, the fan blade can be firmly fixed to the fan blade connecting part 310, effectively preventing the fan blade from loosening or falling off due to vibration or other external forces during equipment operation, thereby ensuring the normal operation of the fan blade and improving the safety and reliability of the equipment. In addition, the threaded connection also has the characteristics of easy installation and disassembly. When it is necessary to replace the fan blade, it can be easily removed from the fan blade connecting part 310 or a new fan blade can be installed simply by rotating the fan blade, without complicated tools and operations.

[0040] See Figure 5 The front housing 31 of this utility model includes a front housing body 311. A first receiving groove 312 is provided on the rear side of the front housing body 311, and the mounting sleeve 7 is disposed in the first receiving groove 312. The first receiving groove 312 provides a precise installation position for the mounting sleeve 7, ensuring accurate installation and positioning of the mounting sleeve 7. At the same time, the first receiving groove 312 can also provide a certain degree of protection for the mounting sleeve 7, preventing it from being impacted or damaged by external forces during equipment operation. A second receiving groove 313 is provided on the front side of the front housing body 311, and the bearing 2 is disposed in the second receiving groove 313. The second receiving groove 313 also provides a stable installation environment for the bearing 2, ensuring the normal operation of the bearing 2. The size and shape of the second receiving groove 313 can be precisely designed according to the specifications of the bearing 2, making the fit between the bearing 2 and the receiving groove tighter, reducing the shaking and vibration of the bearing 2 during operation, and improving the operating accuracy and stability of the equipment.

[0041] See Figure 6The rear housing 32 of this invention includes a rear housing body 321. A mounting base 322 is provided at the center of the rear side of the rear housing body 321. Multiple connecting arms 323 are evenly distributed circumferentially between the mounting base 322 and the rear housing body 321. The arrangement of the multiple connecting arms 323 effectively enhances the connection strength and stability between the mounting base 322 and the rear housing body 321. The evenly distributed circumferential spacing of the connecting arms 323 makes the structure of the rear housing 32 more uniform and stable, effectively dispersing the stress generated during equipment operation and preventing damage to the rear housing 32 due to excessive local stress. Furthermore, the spacing between the connecting arms 323 also serves to dissipate heat and provide ventilation, helping to reduce the internal temperature of the equipment and improve its service life. A mounting groove 324 is provided within the mounting base 322, and one bearing 2 is mounted within the mounting groove 324. The mounting groove 324 provides a dedicated installation space for the bearing 2, ensuring accurate installation and positioning of the bearing 2. Similar to the second receiving groove 313 in the front housing 31, the size and shape of the mounting groove 324 can be precisely designed according to the specifications of the bearing 2, making the fit between the bearing 2 and the mounting groove 324 tighter, effectively reducing the shaking and vibration of the bearing 2 during operation, and improving the operating accuracy and stability of the equipment. At the same time, the mounting groove 324 can also play a certain protective role for the bearing 2, extending the service life of the bearing 2. In this utility model, after the front housing 31 and the rear housing 32 are closed, the bearing 2 on the front side is restricted between the second receiving groove 313 and the positioning ring platform 13, and the bearing 2 on the rear side is restricted between the mounting groove 324 and the first positioning retaining ring 11.

[0042] See Figure 7 In this invention, reinforcing long ribs 15 are spaced along the length of the inner wall of the hollow steel pipe shaft 1 to increase its strength. These reinforcing long ribs 15 effectively enhance the overall strength of the hollow steel pipe shaft 1. When the hollow steel pipe shaft 1 is subjected to external pressure, torque, or bending force, the reinforcing long ribs 15 can effectively disperse and transfer these loads. Under pressure, they can evenly distribute the pressure throughout the inner wall of the hollow steel pipe shaft 1, avoiding local stress concentration and preventing deformation or even rupture of the pipe due to excessive local pressure. Under torque, the reinforcing long ribs 15 are tightly integrated with the inner wall of the hollow steel pipe shaft 1, forming a strong anti-torsional structure, enhancing the torsional stiffness of the shaft, enabling the hollow steel pipe shaft 1 to withstand greater torque without torsional deformation, thereby improving its reliability and stability in applications such as rotating machinery.

[0043] In this invention, multiple L-shaped reinforcing ribs 325 are spaced apart on the inner wall of the connecting arm 323. The L-shaped reinforcing ribs 325 not only enhance the strength of the connecting arm 323, but also allow airflow to enter the stator winding frame 4 during rotation, thereby improving heat dissipation.

[0044] In this invention, a positioning step 314 is provided on the rear end of the front shell body 311, and the front end of the rear shell body 321 abuts against the positioning step 314. The positioning step 314 allows for quick and accurate docking of the rear shell body 321 and the front shell body 311, greatly improving assembly efficiency and reducing assembly errors caused by installation position deviations. The positioning step 314 also plays an important supporting and limiting role. It ensures that the rear shell body 321 and the front shell body 311 maintain a good relative positional relationship during connection, effectively preventing lateral or longitudinal displacement of the front and rear shells during use. Multiple first connecting posts 315 are evenly spaced on the outer wall of the rear end of the front shell 311, and second connecting posts 326 are positioned on the outer wall of the front end of the rear shell 321 at positions corresponding to the first connecting posts 315. Connecting screws 10 are installed within the first and second connecting posts 315 and 326. The combination of the multiple evenly spaced first and second connecting posts 326 and the connecting screws securely connects the front shell 311 and the rear shell 321 together, forming a single integrated structure. The evenly distributed connecting posts ensure that the connection force is evenly distributed on the contact surface of the front and rear shells, avoiding localized stress concentration. When the equipment is subjected to significant external or internal pressure, the connecting posts share the load, ensuring that the connection between the front and rear shells does not easily loosen or become damaged. Furthermore, the use of connecting screws 10 makes the connection detachable, facilitating equipment maintenance and repair. When internal repairs or component replacement are required, simply unscrewing the connecting screws 10 allows for easy separation of the front and rear shells, making the operation simple and convenient. A damping groove 316 is provided on the outer wall of the front shell body 311 at a position corresponding to the first connecting post 315. The evenly distributed damping grooves 316 can adjust the mass distribution of the rotor, reduce the imbalance of centrifugal force during rotation, and thus reduce vibration. The damping grooves 316 can guide the airflow to generate vortices, dissipating vibration energy.

[0045] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A brushless motor with a hollow steel tube shaft and external rotor, characterized in that: The device includes a hollow steel tube shaft (1), with rotor housings (3) provided at both ends of the hollow steel tube shaft (1) via bearings (2), a stator winding frame (4) provided on the hollow steel tube shaft (1) between the two bearings (2), and coils (5) wound on the stator winding frame (4). A lead wire hole (6) is provided on the hollow steel tube shaft (1) between one of the bearings (2) and the stator winding frame (4). An mounting sleeve (7) is provided inside the rotor housing (3), and permanent magnet poles (8) are provided at the corresponding positions of the mounting sleeve (7) and the stator winding frame (4). Connecting threads (9) are provided at both ends of the hollow steel tube shaft (1).

2. A hollow steel tube shaft external rotor brushless motor according to claim 1, characterized in that... A first positioning retaining ring (11) and a second positioning retaining ring (12) are spaced apart on the outer wall of the hollow steel tube shaft (1). The lead wire hole (6) is located between the first positioning retaining ring (11) and the second positioning retaining ring (12). The outer side of one of the bearings (2) abuts against the first positioning retaining ring (11), and the inner side of the stator winding frame (4) abuts against the second positioning retaining ring (12). A positioning ring platform (13) is provided on the outer wall of the hollow steel tube shaft (1) outside the stator winding frame (4), and the inner side of the other bearing (2) abuts against the positioning ring platform (13).

3. A hollow steel tube shaft external rotor brushless motor according to claim 1 or 2, characterized in that... A keyway (14) is provided on the hollow steel pipe shaft (1) at the connecting thread (9).

4. A hollow steel tube shaft external rotor brushless motor according to claim 1, characterized in that... : Reinforcing long ribs (15) that can increase strength are provided at intervals along the length direction on the inner wall of the hollow steel pipe shaft (1).

5. A hollow steel tube shaft external rotor brushless motor according to claim 1, characterized in that... The rotor housing (3) includes a front housing (31) and a rear housing (32) that cover each other.

6. A hollow steel tube shaft external rotor brushless motor according to claim 5, characterized in that... A fan blade connecting part (310) is provided on the outer wall of the front housing (31), and a screw thread (300) is provided on the outer wall of the fan blade connecting part.

7. A hollow steel tube shaft external rotor brushless motor according to claim 5 or 6, characterized in that... The front housing (31) includes a front housing body (311), a first receiving groove (312) is provided on the rear side of the front housing body (311), the mounting sleeve (7) is provided in the first receiving groove (312), a second receiving groove (313) is provided on the front side of the front housing body (311), and the bearing (2) is provided in the second receiving groove (313).

8. A hollow steel tube shaft external rotor brushless motor according to claim 7, characterized in that... The rear housing (32) includes a rear housing body (321), and an assembly seat (322) is provided at the rear center of the rear housing body (321). Multiple connecting arms (323) are evenly distributed along the circumferential direction between the assembly seat (322) and the rear housing body (321). An assembly groove (324) is provided in the assembly seat (322), and one of the bearings (2) is provided in the assembly groove (324).

9. A hollow steel tube shaft external rotor brushless motor according to claim 8, characterized in that... Multiple L-shaped reinforcing ribs (325) are provided at intervals on the inner wall of the connecting arm (323).

10. A hollow steel tube shaft external rotor brushless motor according to claim 8, characterized in that... A positioning step (314) is provided on the rear end of the front shell body (311), and the front end of the rear shell body (321) abuts against the positioning step (314). A plurality of first connecting posts (315) are evenly spaced on the outer wall of the rear end of the front shell body (311). A second connecting post (326) is provided on the outer wall of the front end of the rear shell body (321) at a position corresponding to the first connecting post (315). A connecting screw (10) is provided in the first connecting post (315) and the second connecting post (326). A shock-absorbing groove (316) is provided on the outer wall of the front shell body (311) at a position corresponding to the first connecting post (315).

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