Brushless motor structure
By using hollow oil-containing bearings, oil storage tanks and oil storage cotton cores in brushless DC motors, the problems of small bearing size and high noise are solved, the processing convenience and stability of the motor are improved, friction noise is reduced, and adaptable High temperature and high speed operation environment.
Patent Information
- Application Number
- CN202420821291.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-19
AI Technical Summary
In actual applications, existing brushless DC motors have problems such as small bearing size, difficult finishing, difficult assembly concentricity control, and high noise, especially during high temperatures or long-term operation.
Designed with hollow oil-containing bearings and oil storage tank, vacuum suction lubricant is formed through the oil storage cotton core, combined with gasket and spring structure, reduce friction noise, and provide lubricant flow path through the cross slot to improve the stability and reliability of the motor .
It realizes high concentricity that is easy to process and assembly, reduces noise, and improves the stability and reliability of the motor in high-temperature and high-speed environments.
Smart Images
Figure CN222301573U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of brushless DC motors, and in particular relates to a brushless motor structure. Background Art
[0002] Technological innovation has driven the vigorous development of new energy vehicles. In addition to the energy drive system, new energy vehicles have always been the selling points of car companies in terms of technology and human-machine interaction. Brushless DC motors are widely used in the automotive field due to their small size, high efficiency, sensitive response and high reliability.
[0003] However, the brushless DC motors in the prior art have some defects in actual application. For example, the motor shaft is generally fixed by two bearings, which leads to small bearing size, difficulty in fine machining, long distance between upper and lower bearings, difficulty in controlling assembly concentricity, and loud bearing friction noise after high temperature or long-term operation. Utility Model Content
[0004] In order to solve the problems raised in the above background technology, the utility model provides a brushless motor structure, which has the characteristics of easy processing, high assembly concentricity and low noise.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a brushless motor structure, including a rotor assembly, a stator assembly and a hollow oil-containing bearing, wherein the rotor assembly includes a shell, a magnetic ring is connected to the inner wall of the shell, and a motor shaft is connected to the middle position of the shell, the stator assembly includes a base, one end of the base circumference is connected to an iron core assembly located inside the shell, the other end of the base circumference is connected to a mounting bracket, and an FPC board is connected to the side of the mounting bracket, the hollow oil-containing bearing is sleeved on the outside of the motor shaft, the base is sleeved on the outside of the hollow oil-containing bearing, and an oil storage tank is provided in the middle position inside the hollow oil-containing bearing.
[0006] In order to interact with the magnetic field generated by the magnetic ring to drive the motor to move, the core assembly further includes an iron core with a coil wound around it.
[0007] In order to prevent the upper and lower end surfaces of the hollow oil-containing bearing from contacting and rubbing with the retaining spring or the boss of the outer shell to produce loud noise; at the same time, it can also play a buffering role. Further, two gaskets are sleeved on the motor shaft, and the two gaskets are respectively located at the two ends of the hollow oil-containing bearing.
[0008] In order to achieve the limiting of the motor shaft and the hollow oil-containing bearing, further, a retaining spring is clamped at the end of the motor shaft.
[0009] In order to make the motor more adaptable to long-term high-temperature and high-speed operation environment and improve the stability and reliability of the motor, a accommodating cavity is further provided on the end face of the base, an oil storage cotton core is placed in the accommodating cavity, and the outside of the accommodating cavity is connected to a bottom cover.
[0010] In order to provide a flow channel for the lubricating oil, further, a cross groove is provided on the end surface of the hollow oil-containing bearing.
[0011] Compared with the prior art, the beneficial effects of the utility model are:
[0012] 1. The rotor assembly and the stator assembly of the utility model are connected by a hollow oil-containing bearing, which is easier to process than conventional ball bearings, and has higher concentricity after assembly, which can effectively avoid the concentricity friction noise caused by the upper and lower double bearings;
[0013] 2. The utility model provides an oil storage tank in the middle of the hollow oil-containing bearing, which can not only store oil but also reduce the contact area with the motor shaft, thereby reducing friction damping, assembly noise and friction noise;
[0014] 3. The end surface of the base of the utility model is provided with a receiving cavity, and an oil storage cotton core is placed in the receiving cavity. The oil storage cotton core is used to store oil. When the motor shaft rotates at high speed, a vacuum is formed at the oil storage tank, and the negative pressure sucks a part of the lubricating oil in the oil storage cotton core to increase the lubrication effect. When the motor stops working, the excess lubricating oil in the oil storage tank is sucked back by the oil storage cotton core to form a cycle, so that the motor can better adapt to the long-term high-temperature and high-speed operation environment, and improve the stability and reliability of the motor;
[0015] 4. A cross groove is provided on the end surface of the hollow oil-containing bearing of the utility model to provide a flow channel for the lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0017] Figure 1 It is a schematic diagram of the explosion of the structure of the utility model;
[0018] Figure 2 It is a structural schematic diagram of the rotor assembly of the utility model;
[0019] Figure 3 It is a structural schematic diagram of the stator assembly of the utility model;
[0020] Figure 4 It is a structural schematic diagram of the base of the utility model;
[0021] Figure 5 This is a schematic diagram of the structure of the hollow oil-containing bearing of the utility model;
[0022] Figure 6 This is a schematic cross-sectional view of the hollow oil-containing bearing of the utility model;
[0023] Figure 7 It is a cross-sectional structural schematic diagram of the utility model;
[0024] In the figure: 1. rotor assembly; 101. housing; 102. magnetic ring; 103. motor shaft; 104. gasket; 105. retaining spring; 2. stator assembly; 21. mounting bracket; 22. base; 221. accommodating cavity; 23. core assembly; 24. FPC board; 25. oil storage cotton core; 26. bottom cover; 3. hollow oil-containing bearing; 31. cross slot; 32. oil storage tank. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Example 1
[0027] See also Figure 1-7 The utility model provides the following technical solutions: a brushless motor structure, including a rotor assembly 1, a stator assembly 2 and a hollow oil-containing bearing 3, wherein the rotor assembly 1 includes a shell 101, a magnetic ring 102 is connected to the inner wall of the shell 101, and a motor shaft 103 is connected to the middle position of the shell 101, and the stator assembly 2 includes a base 22, one end of the circumference of the base 22 is connected to an iron core assembly 23 located inside the shell 101, and the other end of the circumference of the base 22 is connected to a mounting bracket 21, and an FPC board 24 is connected to the side of the mounting bracket 21, the hollow oil-containing bearing 3 is sleeved on the outside of the motor shaft 103, the base 22 is sleeved on the outside of the hollow oil-containing bearing 3, and an oil storage tank 32 is provided in the middle position inside the hollow oil-containing bearing 3. When assembling, oil is added to the oil storage tank 32.
[0028] By adopting the above technical solution, the rotor assembly 1 and the stator assembly 2 of the utility model are connected through the hollow oil-containing bearing 3, which is easier to process than conventional ball bearings, and has higher concentricity after assembly, which can effectively avoid the concentricity friction noise caused by the upper and lower double bearings; the utility model is provided with an oil storage tank 32 at the middle position inside the hollow oil-containing bearing 3, which can not only store oil but also reduce the contact area with the motor shaft 103, thereby reducing friction damping, reducing assembly noise and friction noise.
[0029] Specifically, the core assembly 23 includes an iron core, on which a coil is wound.
[0030] By adopting the above technical solution, the electric field generated by the coil being energized and the magnetic field generated by the magnetic ring 102 mutually drive the motor to move.
[0031] Specifically, two gaskets 104 are sleeved on the motor shaft 103 , and the two gaskets 104 are respectively located at two ends of the hollow oil-containing bearing 3 .
[0032] By adopting the above technical solution, when the rotor assembly 1 and the stator assembly 2 are separated under strong external force, the gasket 104 can prevent the upper and lower end surfaces of the hollow oil-containing bearing 3 from contacting and rubbing with the retaining spring 105 or the boss of the housing 101 to generate loud noise; at the same time, it can also play a buffering role.
[0033] Specifically, a clamping spring 105 is clamped at the end of the motor shaft 103 .
[0034] By adopting the above technical solution, the motor shaft 103 and the hollow oil-containing bearing 3 are limited.
[0035] Example 2
[0036] The present embodiment is different from the embodiment 1 in that: specifically, a receiving cavity 221 is provided on the end face of the base 22, an oil storage cotton core 25 is placed in the receiving cavity 221, and oil is appropriately applied to the oil storage cotton core 25 during assembly, and a bottom cover 26 is connected to the outside of the receiving cavity 221.
[0037] By adopting the above technical solution, the oil storage cotton core 25 is used to store oil. When the motor shaft 103 rotates at high speed, a vacuum is formed at the oil storage tank 32. The negative pressure absorbs a part of the lubricating oil in the oil storage cotton core 25 to increase the lubrication effect. When the motor stops working, the excess lubricating oil in the oil storage tank 32 is sucked back by the oil storage cotton core 25 to form a cycle, so that the motor can better adapt to the long-term high-temperature and high-speed operation environment, and improve the stability and reliability of the motor.
[0038] Example 3
[0039] The difference between this embodiment and the second embodiment is that: specifically, a cross groove 31 is provided on the end surface of the hollow oil-containing bearing 3 .
[0040] By adopting the above technical solution, a flow channel is provided for the lubricating oil.
[0041] In summary, the rotor assembly 1 and the stator assembly 2 of the utility model are connected by the hollow oil-containing bearing 3, which is easier to process than conventional ball bearings, and has higher concentricity after assembly, which can effectively avoid the concentricity friction noise caused by the upper and lower double bearings; the utility model is provided with an oil storage tank 32 at the middle position inside the hollow oil-containing bearing 3, which can not only store oil, but also reduce the contact area with the motor shaft 103, thereby reducing friction damping, reducing assembly noise and friction noise; the utility model is provided with a receiving cavity 221 on the end surface of the base 22 An oil storage cotton core 25 is placed in the accommodating cavity 221. The oil storage cotton core 25 is used to store oil. When the motor shaft 103 rotates at high speed, a vacuum is formed at the oil storage tank 32. The negative pressure sucks a part of the lubricating oil in the oil storage cotton core 25 to increase the lubrication effect. When the motor stops working, the excess lubricating oil in the oil storage tank 32 is sucked back by the oil storage cotton core 25 to form a cycle, so that the motor can better adapt to the long-term high-temperature and high-speed operation environment, and improve the stability and reliability of the motor; a cross groove 31 is provided on the end face of the hollow oil-containing bearing 3 of the utility model to provide a flow channel for the lubricating oil.
[0042] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A brushless motor structure, characterized in that: It includes a rotor assembly, a stator assembly and a hollow oil-containing bearing, wherein the rotor assembly includes an outer shell, the inner wall of the outer shell is connected to a magnetic ring, the middle position of the outer shell is connected to a motor shaft, the stator assembly includes a base, one end of the base circumference is connected to an iron core assembly located inside the outer shell, the other end of the base circumference is connected to a mounting bracket, the side of the mounting bracket is connected to an FPC board, the hollow oil-containing bearing is sleeved on the outside of the motor shaft, the base is sleeved on the outside of the hollow oil-containing bearing, and an oil storage tank is provided in the middle position inside the hollow oil-containing bearing.
2. A brushless motor structure according to claim 1, characterized in that: The iron core assembly comprises an iron core, on which a coil is wound.
3. A brushless motor structure according to claim 1, characterized in that: The motor shaft is also sleeved with two gaskets, which are respectively located at two ends of the hollow oil-containing bearing.
4. A brushless motor structure according to claim 1, characterized in that: The end of the motor shaft is clamped with a clamping spring.
5. The brushless motor structure according to claim 1, characterized in that: An accommodating cavity is arranged on the end surface of the base, an oil storage cotton core is placed in the accommodating cavity, and the outside of the accommodating cavity is connected with a bottom cover.
6. A brushless motor structure according to claim 5, characterized in that: A cross groove is arranged on the end surface of the hollow oil-containing bearing.