High-stability brushless motor

Abstract

The utility model relates to the technical field of brushless motors, and provides a high-stability brushless motor which comprises a stator assembly and a rotor assembly, the stator assembly comprises an end cover and a bearing arranged on the outer side of the end cover, the rotor assembly comprises a rotating shaft, the rotating shaft penetrates through the bearing, and the bearing rotatably supports the rotating shaft; the motor also comprises a cooling fan, and the cooling fan is disposed on the rotating shaft and is connected with the rotor assembly. The end cover is provided with a plurality of ventilation holes, and the ventilation holes are distributed at intervals in the circumferential direction and located at the air blowing end of the cooling fan. The brushless motor has the effect of improving the heat dissipation capability of the brushless motor.

Description

Technical Field

[0001] This application relates to the field of brushless motor technology, and in particular to a high-stability brushless motor. Background Technology

[0002] A brushless motor mainly consists of four parts: the housing, the stator assembly, the rotor assembly, and the controller. The stator assembly comprises the stator core and the stator windings. The stator core is typically made of laminated silicon steel sheets with slots on its inner surface to house the stator windings. The rotor assembly includes the rotor core and permanent magnets mounted on it.

[0003] When the stator windings of a brushless motor are powered on, the current in the winding coils generates a magnetic field. This magnetic field interacts with the permanent magnets on the rotor, thereby driving the rotor to rotate. In short, the rotor's permanent magnets have a natural tendency to align their internal magnetic field lines with their external magnetic field lines. Specifically, the N pole of the rotor's permanent magnet tends to align with the S pole of the energized winding, while the S pole tends to align with the N pole of the energized winding. This alignment tendency generates a rotational torque on the rotor, causing it to begin rotating under the influence of this torque.

[0004] Regarding the aforementioned technologies, the heat generated by current brushless motors during operation often accumulates inside the casing, leading to overheating damage. This may shorten the lifespan of the brushless motor, thus requiring improvement. Utility Model Content

[0005] In order to improve the heat dissipation capacity of brushless motors and extend their service life, this application provides a highly stable brushless motor.

[0006] The high-stability brushless motor provided in this application adopts the following technical solution:

[0007] A high-stability brushless motor includes a stator assembly and a rotor assembly. The stator assembly includes an end cover and a bearing disposed outside the end cover. The rotor assembly includes a shaft passing through the bearing, and the bearing rotatably supports the shaft. The motor also includes a cooling fan disposed on the shaft and connected to the rotor assembly. The end cover has a plurality of ventilation holes, which are spaced apart along the circumferential direction and located at the blowing end of the cooling fan.

[0008] By adopting the above technical solution, when the stator winding of the brushless motor is powered on, the current in the winding coil generates a magnetic field. This magnetic field interacts with the permanent magnets on the rotor assembly, thereby driving the shaft to rotate. During the rotation of the shaft, the cooling fan can rotate accordingly, thereby achieving air circulation, removing the heat generated by the motor, controlling the motor temperature within a safe range, improving the heat dissipation capacity of the brushless motor, and extending the motor's service life.

[0009] Preferably, the rotor assembly further includes a rotor core and a permanent magnet disposed on the rotor core. The rotor core includes a yoke and a plurality of teeth extending inward from the yoke. The rotor core is located between the end cover and the cooling fan.

[0010] Preferably, it further includes an air guide duct and several limiting plates. The air guide duct is sleeved on the rotor core and is hollow. Each of the limiting plates is connected to the inner wall of the air guide duct and is distributed at intervals along the circumference of the air guide duct. A limiting groove is formed between two adjacent limiting plates. Several limiting blocks are connected to the cooling fan, and each limiting block is respectively engaged in the limiting groove.

[0011] By adopting the above technical solution, the installation of the cooling fan and the air guide tube is achieved through the cooperation of the limiting block and the limiting groove, thereby improving the stability of the cooling fan. The air guide tube can guide the air blown out by the cooling fan, reducing the possibility of the blown-out cool air being dispersed.

[0012] Preferably, it further includes a stop block, which is disposed on the rotating shaft and located on the side of the cooling fan away from the end cover. The stop block is used to prevent the cooling fan from falling off the rotating shaft.

[0013] By adopting the above technical solution, the stop block is installed on the shaft, which plays a limiting role for the cooling fan and prevents the cooling fan from falling off the shaft.

[0014] Preferably, the permanent magnet is made of neodymium iron boron or samarium cobalt.

[0015] By adopting the above technical solutions, neodymium iron boron materials have the characteristics of strong magnetism and high temperature resistance; while samarium cobalt materials are suitable for higher temperature environments, and both can be used to make permanent magnets.

[0016] Preferably, the rotor core is made of silicon steel sheet material.

[0017] By adopting the above technical solution and using silicon steel sheets of appropriate thickness, both sufficient magnetic permeability can be guaranteed and eddy current losses can be reduced.

[0018] Preferably, the outer surface of the rotor core is provided with a protective layer.

[0019] By adopting the above technical solution, the protective layer can protect the rotor core and extend its service life.

[0020] Preferably, the bearing is a ball bearing or an oil-impregnated bearing.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] (1) By setting a cooling fan, the cooling fan can rotate along with the shaft during rotation, thereby achieving air circulation, carrying away the heat generated by the motor, improving the heat dissipation capacity of the brushless motor, and extending the service life of the motor.

[0023] (2) By setting up an air duct, the air duct can guide the air blown out by the cooling fan, reducing the possibility that the blown cold air will be dispersed.

[0024] (3) By setting a stop block, which is installed on the shaft, the cooling fan can be limited to prevent it from falling off the shaft. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the brushless motor in the embodiments of this application;

[0026] Figure 2 This is an exploded schematic diagram of the cooling fan and air duct in the embodiments of this application;

[0027] Figure 3 This is a structural schematic diagram of the brushless motor from another perspective in an embodiment of this application.

[0028] Reference numerals in the attached drawings: 1. Stator assembly; 11. End cover; 12. Bearing; 2. Rotor assembly; 21. Shaft; 22. Rotor core; 3. Cooling fan; 4. Ventilation hole; 5. Air guide tube; 6. Limiting plate; 7. Limiting groove; 8. Limiting block; 9. Stop block. Detailed Implementation

[0029] The technical solutions of this application will now be described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can be embodied in many different forms and is not limited to the embodiments described herein.

[0030] In the representation of this application, the reference to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., means that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection; a detachable connection; an integral part; or a mechanical connection. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0033] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Without conflict, those skilled in the art can combine and integrate the different embodiments or examples shown in this application, as well as the features of those embodiments or examples.

[0034] This application discloses a highly stable brushless motor. (Refer to...) Figure 1 and Figure 2 The brushless motor includes a stator assembly 1, a rotor assembly 2, and a cooling fan 3. The stator assembly 1 includes an end cover 11 and a bearing 12 located outside the end cover 11. The bearing 12 is a ball bearing 12 or an oil-impregnated bearing 12. The rotor assembly 2 includes a shaft 21 that passes through the bearing 12, and the bearing 12 rotatably supports the shaft 21. The rotor assembly 2 also includes a rotor core 22 and permanent magnets disposed on the rotor core 22. The rotor core 22 includes a yoke and a plurality of teeth extending inward from the yoke.

[0035] In this embodiment, the rotor core 22 is made of silicon steel sheets. By using silicon steel sheets of appropriate thickness, sufficient magnetic permeability can be ensured while reducing eddy current losses. The permanent magnet is made of neodymium iron boron or samarium cobalt. Neodymium iron boron has the characteristics of strong magnetism and high temperature resistance; while samarium cobalt is suitable for higher temperature environments. The material for making the permanent magnet can be reasonably selected according to actual needs. The outer surface of the rotor core 22 is also provided with a protective layer. The protective layer can protect the rotor core 22 and extend its service life.

[0036] The cooling fan 3 is mounted on the rotating shaft 21 and connected to the rotor core 22, which is located between the end cover 11 and the cooling fan 3. The end cover 11 has several ventilation holes 4, which are spaced apart along the circumference and located at the blowing end of the cooling fan 3.

[0037] When the stator windings of the brushless motor are powered on, the current in the winding coils generates a magnetic field. This magnetic field interacts with the permanent magnets on the rotor assembly 2, thereby driving the shaft 21 to rotate. During the rotation of the shaft 21, the cooling fan 3 can rotate accordingly, thereby achieving air circulation, removing the heat generated by the motor, controlling the motor temperature within a safe range, improving the heat dissipation capacity of the brushless motor, and extending the motor's service life.

[0038] Specifically, an air guide duct 5 is also fitted onto the rotating shaft 21. The air guide duct 5 is hollow, and each limiting plate 6 is fixedly connected to the inner wall of the air guide duct 5 and is distributed at intervals along the circumference of the air guide duct 5. A limiting groove 7 is formed between two adjacent limiting plates 6. Several limiting blocks 8 are integrally connected to the cooling fan 3, and each limiting block 8 is respectively engaged in the limiting groove 7. With the cooperation of the limiting blocks 8 and the limiting groove 7, the cooling fan 3 and the air guide duct 5 are installed, improving the stability of the cooling fan 3. The air guide duct 5 can guide the air blown out by the cooling fan 3, reducing the possibility of the blown cold air being dispersed.

[0039] Combination Figure 3 In addition, a stop block 9 is installed on the rotating shaft 21. The stop block 9 is located on the side of the cooling fan 3 away from the end cover 11. In this embodiment, the stop block 9 is connected to the rotating shaft 21 by a threaded connection. The stop block 9 is used to restrict the cooling fan 3 from falling off the rotating shaft 21 and improve the stability of the installation of the cooling fan 3.

[0040] The implementation principle of a high-stability brushless motor according to this application embodiment is as follows: When the stator winding of the brushless motor is powered on, the current in the winding coil generates a magnetic field. This magnetic field interacts with the permanent magnet on the rotor assembly 2, thereby driving the rotating shaft 21 to rotate. During the rotation of the rotating shaft 21, the cooling fan 3 can rotate accordingly, thereby achieving air circulation, removing the heat generated by the motor, controlling the motor temperature within a safe range, improving the heat dissipation capacity of the brushless motor, and extending the service life of the motor.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-stability brushless motor, comprising a stator assembly (1) and a rotor assembly (2), wherein the stator assembly (1) includes an end cover (11) and a bearing (12) disposed outside the end cover (11), and the rotor assembly (2) includes a shaft (21) passing through the bearing (12), the bearing (12) rotatably supporting the shaft (21); characterized in that, It also includes a cooling fan (3), which is mounted on the rotating shaft (21) and connected to the rotor assembly (2); the end cover (11) has a plurality of ventilation holes (4), each of the ventilation holes (4) is spaced apart along the circumferential direction and located at the blowing end of the cooling fan (3).

2. The high-stability brushless motor according to claim 1, characterized in that, The rotor assembly (2) further includes a rotor core (22) and a permanent magnet disposed on the rotor core (22). The rotor core (22) includes a yoke and a plurality of teeth extending inward from the yoke. The rotor core (22) is located between the end cover (11) and the cooling fan (3).

3. A high-stability brushless motor according to claim 2, characterized in that, It also includes an air guide tube (5) and several limiting plates (6). The air guide tube (5) is sleeved on the rotor core (22) and is hollow. Each of the limiting plates (6) is connected to the inner wall of the air guide tube (5) and is distributed at intervals along the circumference of the air guide tube (5). A limiting groove (7) is formed between two adjacent limiting plates (6). Several limiting blocks (8) are connected to the cooling fan (3), and each of the limiting blocks (8) is respectively engaged in the limiting groove (7).

4. A high-stability brushless motor according to claim 2, characterized in that, It also includes a stop block (9), which is disposed on the rotating shaft (21) and located on the side of the cooling fan (3) away from the end cover (11). The stop block (9) is used to restrict the cooling fan (3) from falling off the rotating shaft (21).

5. A high-stability brushless motor according to claim 2, characterized in that, The permanent magnet is made of neodymium iron boron or samarium cobalt.

6. A high-stability brushless motor according to claim 2, characterized in that, The rotor core (22) is made of silicon steel sheet material.

7. A high-stability brushless motor according to claim 2, characterized in that, The outer surface of the rotor core (22) is provided with a protective layer.

8. A high-stability brushless motor according to claim 1, characterized in that, The bearing (12) is a ball bearing (12) or an oil-impregnated bearing (12).

Images