Brushless motor device

Abstract

The utility model belongs to the technical field of motors, and particularly provides a brushless motor device which comprises a machine shell, an end cover assembly, a stator assembly, a Hall assembly and a rotor assembly, the two opposite ends of the machine shell are provided with an opening and a mounting hole respectively, the Hall assembly is provided with a through hole, and the diameter of the through hole is smaller than that of the part, located in an inner hole of the stator assembly, of the rotor assembly. The diameter of the mounting hole is smaller than that of the opening and larger than or equal to the maximum diameter of the rotor assembly. Firstly, welding work of the stator assembly and the Hall assembly is completed outside the machine shell, then the stator assembly and the Hall assembly are installed in the machine shell from an opening of the machine shell, then the end cover assembly is installed to block the opening, and finally the rotor assembly is installed in the machine shell from an installation hole of the machine shell. According to the brushless motor device, the rotor assembly sequentially penetrates through the inner hole of the stator assembly and the through hole of the Hall assembly, and compared with welding work of the stator assembly and the Hall assembly in a machine shell, the difficulty of welding operation can be reduced, so that the assembling efficiency of the brushless motor device is improved.

Description

Brushless motor device Technical Field

[0001] This application belongs to the field of motor technology, specifically relating to a brushless motor device. Background Technology

[0002] A brushless motor with a built-in Hall plate typically includes a housing, end caps, a stator assembly, a rotor assembly, and a Hall plate. The Hall plate needs to be welded to the stator assembly near the end cap. The rotor assembly needs to pass through the stator assembly, and the end of the rotor assembly extending outside the stator assembly needs to pass through a through-hole in the center of the Hall plate. If the welded Hall plate and stator assembly are installed into the housing first, when installing the rotor assembly, the diameter of the portion of the rotor assembly that needs to be inside the stator assembly is larger than the diameter of the through-hole in the Hall plate. This will prevent the rotor assembly from passing through the through-hole in the Hall plate and entering the stator assembly, resulting in rotor assembly installation failure. Therefore, it is generally necessary to first install the stator assembly into the housing through the opening, then install the rotor assembly into the housing and pass it through the stator assembly. Next, place the Hall plate into the housing, so that the end of the rotor assembly extending outside the stator assembly passes through the through-hole in the Hall plate. Then, weld the Hall plate to the stator assembly within the housing. Finally, install the end cap to seal the opening in the housing. However, the small internal space of the housing makes welding operations very difficult, thus affecting the assembly efficiency of the motor. Summary of the Invention

[0003] The purpose of this application is to provide a brushless motor device that aims to solve the technical problem of low assembly efficiency of brushless motors with built-in Hall plates in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a brushless motor device, including a housing, an end cover assembly, a stator assembly, a Hall effect assembly, and a rotor assembly. The housing has openings and mounting holes at opposite ends. The end cover assembly is mounted in the openings. The stator assembly and the Hall effect assembly are both mounted inside the housing. The rotor assembly passes through the inner hole of the stator assembly. The Hall effect assembly is connected to the end of the stator assembly near the end cover assembly. The Hall effect assembly has a through hole with a diameter smaller than the diameter of the portion of the rotor assembly located in the inner hole of the stator assembly. The end of the rotor assembly near the end cover assembly extends out of the inner hole of the stator assembly and passes through the through hole. The diameter of the opening is greater than or equal to the outer diameter of the stator assembly. The diameter of the mounting hole is smaller than the diameter of the opening but greater than or equal to the maximum diameter of the rotor assembly.

[0005] Furthermore, the brushless motor device also includes a first bearing, which is sleeved on the rotor assembly and installed in a mounting hole. The outer diameter of the first bearing matches the diameter of the mounting hole.

[0006] Furthermore, a first bearing mounting portion is formed by a partial protrusion at the end of the housing away from the opening, which protrudes away from the end cover, and a mounting hole is formed inside the first bearing mounting portion.

[0007] Furthermore, the end cap assembly includes an end cap body and a second bearing. The end cap body is installed in the opening, and the second bearing is fixedly mounted on the end cap body and sleeved on the rotor assembly.

[0008] Furthermore, the rotor assembly includes a rotating shaft and a magnet sleeve. The rotating shaft passes through the inner hole of the stator assembly, and the magnet sleeve is located in the inner hole of the stator assembly and is fixedly sleeved on the rotating shaft. The diameter of the mounting hole is greater than or equal to the outer diameter of the magnet sleeve. The first bearing and the second bearing are both sleeved on the rotating shaft.

[0009] Furthermore, the rotor assembly also includes a first fixed sleeve and a second fixed sleeve, both of which are fixedly sleeved on the rotating shaft and respectively abut against the axial ends of the magnet sleeve. The diameter of the mounting hole is greater than or equal to the outer diameter of the first fixed sleeve and the second fixed sleeve.

[0010] Furthermore, the first fixed sleeve is located between the first bearing and the magnet sleeve, and the two axial ends of the first fixed sleeve abut against the magnet sleeve and the first bearing, respectively; the brushless motor device also includes an elastic element, the two ends of which are connected to the second fixed sleeve and the end cover assembly, respectively.

[0011] Furthermore, the end of the shaft near the first bearing is located outside the housing.

[0012] Furthermore, a portion of the end cap body protrudes away from the mounting hole to form a second bearing mounting portion. A fixing hole communicating with the interior of the housing is formed in the second bearing mounting portion, and the second bearing is fixedly installed in the fixing hole.

[0013] Furthermore, an axial limiting part is provided at the end of the second bearing mounting part away from the end cover body, and the axial limiting part abuts against the side of the second bearing opposite to the mounting hole.

[0014] Compared with the prior art, the beneficial effects of the brushless motor device provided in this application are as follows: During assembly, the stator assembly and the Hall assembly are first connected on the outside of the housing, which can be, but is not limited to, welding. Since the diameter of the opening at one end of the housing is greater than or equal to the outer diameter of the stator assembly, the assembled stator assembly and the Hall assembly can be installed into the housing as a whole through the opening. Then, the end cover assembly is installed to seal the opening of the housing. Since the diameter of the mounting hole at the other end of the housing is greater than or equal to the maximum diameter of the rotor assembly, the rotor assembly can then be installed into the housing through the mounting hole. The rotor assembly passes through the inner hole of the stator assembly and the through hole of the Hall assembly in sequence, thus completing the assembly of the brushless motor device. Compared to the traditional method of first installing the stator and rotor assemblies into the housing and then welding the stator assembly to the Hall plate inside the housing, this application allows the stator assembly and Hall assembly to be welded to the outside of the housing first. Then, the stator assembly and Hall assembly are installed into the housing through the opening, followed by the installation of the end cover assembly to seal the opening. Finally, the rotor assembly is installed into the housing through the mounting hole, allowing the rotor assembly to pass through the inner hole of the stator assembly and the through hole of the Hall assembly in sequence. This reduces the difficulty of the welding operation and improves the assembly efficiency of the brushless motor device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a cross-sectional view of the brushless motor device provided in an embodiment of this application;

[0017] Figure 2 is a cross-sectional view of the housing of the brushless motor device shown in Figure 1.

[0018] The following are the labeling elements in the figure:

[0019] 10. Housing; 11. Opening; 12. Mounting hole; 13. First bearing mounting part;

[0020] 20. End cap assembly; 21. End cap body; 211. Second bearing mounting part; 212. Axial limiting part; 22. Second bearing;

[0021] 30. Stator assembly;

[0022] 40. Hall effect sensor; 41. Through-hole;

[0023] 50. Rotor assembly; 51. Shaft; 52. Magnet sleeve; 53. First fixing sleeve; 54. Second fixing sleeve;

[0024] 60. First bearing;

[0025] 70. Elastic components. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0027] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] A brushless motor with a built-in Hall plate typically includes a housing, end caps, a stator assembly, a rotor assembly, and a Hall plate. The Hall plate needs to be welded to the stator assembly near the end cap. The rotor assembly needs to pass through the stator assembly, and the end of the rotor assembly extending outside the stator assembly needs to pass through a through-hole in the center of the Hall plate. If the welded Hall plate and stator assembly are installed into the housing first, when installing the rotor assembly, the diameter of the portion of the rotor assembly that needs to be inside the stator assembly is larger than the diameter of the through-hole in the Hall plate. This will prevent the rotor assembly from passing through the through-hole in the Hall plate and entering the stator assembly, resulting in rotor assembly installation failure. Therefore, it is generally necessary to first install the stator assembly into the housing through the opening, then install the rotor assembly into the housing and pass it through the stator assembly. Next, place the Hall plate into the housing, so that the end of the rotor assembly extending outside the stator assembly passes through the through-hole in the Hall plate. Then, weld the Hall plate to the stator assembly within the housing. Finally, install the end cap to seal the opening in the housing. However, the small internal space of the housing makes welding operations very difficult, thus affecting the assembly efficiency of the motor.

[0031] To address the above problems, this application provides a brushless motor device. As shown in Figures 1 and 2, the brushless motor device includes a housing 10, an end cover assembly 20, a stator assembly 30, a Hall effect assembly 40, and a rotor assembly 50. The housing 10 has an opening 11 and a mounting hole 12 at opposite ends. The end cover assembly 20 is mounted in the opening 11. The stator assembly 30 and the Hall effect assembly 40 are both mounted inside the housing 10. The rotor assembly 50 passes through the inner hole of the stator assembly 30. The Hall effect assembly 40 is connected to the end of the stator assembly 30 near the end cover assembly 20. The Hall effect assembly 40 has a through hole 41, the diameter of which is smaller than the diameter of the portion of the rotor assembly 50 located within the inner hole of the stator assembly 30. The end of the rotor assembly 50 near the end cover assembly 20 extends out of the inner hole of the stator assembly 30 and passes through the through hole 41. The diameter of the opening 11 is greater than or equal to the outer diameter of the stator assembly 30. The diameter of the mounting hole 12 is smaller than the diameter of the opening 11 but greater than or equal to the maximum diameter of the rotor assembly 50.

[0032] During assembly, the stator assembly 30 and the Hall assembly 40 are first connected on the outside of the housing 10, which can be, but is not limited to, welding. Since the diameter of the opening 11 at one end of the housing 10 is greater than or equal to the outer diameter of the stator assembly 30, the assembled stator assembly 30 and the Hall assembly 40 can be inserted into the housing 10 through the opening 11. Then, the end cap assembly 20 is installed to seal the opening 11 of the housing 10. Since the diameter of the mounting hole 12 at the other end of the housing 10 is greater than or equal to the maximum diameter of the rotor assembly 50, the rotor assembly 50 can then be inserted into the housing 10 through the mounting hole 12. The rotor assembly 50 passes through the inner hole of the stator assembly 30 and the through hole 41 of the Hall assembly 40 in sequence, thus completing the assembly of the brushless motor device. Compared to the traditional method of first installing the stator assembly 30 and rotor assembly 50 into the housing 10, and then welding the stator assembly 30 to the Hall plate inside the housing 10, this application allows the stator assembly 30 and Hall assembly 40 to be welded to the outside of the housing 10 first. Then, the stator assembly 30 and Hall assembly 40 are installed into the housing 10 through the opening 11. Next, the end cover assembly 20 is installed to seal the opening 11. Finally, the rotor assembly 50 is installed into the housing 10 through the mounting hole 12, so that the rotor assembly 50 passes through the inner hole of the stator assembly 30 and the through hole 41 of the Hall assembly 40 in sequence. This reduces the difficulty of the welding operation and improves the assembly efficiency of the brushless motor device.

[0033] Specifically, the Hall component 40 is a Hall plate, which includes a circuit board and a Hall sensor mounted on the circuit board, and plays the role of detecting the position of the rotor component 50. The aforementioned through hole 41 is opened in the middle of the circuit board, and the circuit board is welded and fixed to the stator component 30.

[0034] In some embodiments, as shown in Figures 1 and 2, the brushless motor device further includes a first bearing 60, which is sleeved on the rotor assembly 50 and installed within a mounting hole 12. The outer diameter of the first bearing 60 matches the diameter of the mounting hole 12. It should be noted that matching the outer diameter of the first bearing 60 with the diameter of the mounting hole 12 means that the diameter of the mounting hole 12 is determined based on the outer diameter of the first bearing 60. When the first bearing 60 is installed in the mounting hole 12, the mounting hole 12 provides radial restraint for the first bearing 60. Due to tolerances, the outer diameter of the first bearing 60 can be equal to, slightly smaller than, or slightly larger than the diameter of the mounting hole 12. For ease of installation, the outer diameter of the first bearing 60 can be slightly smaller than the diameter of the mounting hole 12, meaning the fit between the first bearing 60 and the mounting hole 12 is loose. Additionally, adhesive can be added between the first bearing 60 and the wall of the mounting hole 12 to securely fix the first bearing 60 in the mounting hole 12. By providing the first bearing 60 on the rotor assembly 50, support for the rotor assembly 50 and a rotatable connection between the rotor assembly 50 and the housing 10 can be achieved, allowing the rotor assembly 50 to rotate relative to the housing 10. In conventional brushless motors with built-in Hall plates, the housing 10 also requires a hole for bearing installation, but the diameter of this hole is generally smaller than the maximum diameter of the rotor assembly 50. However, the diameter of the mounting hole 12 in this application is greater than or equal to the maximum diameter of the rotor assembly 50, thus allowing the selection of a larger bearing, thereby enhancing the load-bearing capacity of the rotor assembly 50 and improving the operational reliability of the brushless motor device. Specifically, the first bearing 60 can be a standardized bearing with an outer diameter of Dz, a width of Lz, a diameter of D for the mounting hole 12, a length of L for the mounting hole 12, D = Dz, and L ≥ 80% Lz.

[0035] During assembly, the first bearing 60 can be fitted onto the rotor assembly 50. The first bearing 60 and the rotor assembly 50 can be loosely fitted and fixed with glue. Then, the rotor assembly 50 is inserted into the housing 10 through the mounting hole 12, so that the rotor assembly 50 passes through the inner hole of the stator assembly 30 and the through hole 41 of the Hall assembly 40 in sequence. The first bearing 60 is pushed into the mounting hole 12 and fixed in the mounting hole 12 with glue.

[0036] In some embodiments, as shown in Figures 1 and 2, a first bearing mounting portion 13 is formed by a partial protrusion at the end of the housing 10 away from the opening 11, directed away from the end cover assembly 20. A mounting hole 12 is formed inside the first bearing mounting portion 13. By forming the first bearing mounting portion 13 by a partial protrusion at the end of the housing 10 away from the opening 11, and forming the mounting hole 12 within the first bearing mounting portion 13, the length of the mounting hole 12 can be increased without increasing the overall thickness of the housing 10, thus meeting the installation requirements of the first bearing 60. Specifically, the first bearing mounting portion 13 is cylindrical and located at the middle of the end of the housing 10 away from the opening 11, such that the axis of the mounting hole 12 coincides with the axis of the inner hole of the stator assembly 30.

[0037] In some embodiments, as shown in FIG1, the end cap assembly 20 includes an end cap body 21 and a second bearing 22. The end cap body 21 is installed in the opening 11, and the second bearing 22 is fixedly disposed on the end cap body 21 and sleeved on the rotor assembly 50. The first bearing 60 and the second bearing 22 cooperate with each other to stably support the rotor assembly 50 and improve the stability of the rotor assembly 50 during rotation. The second bearing 22 and the rotor assembly 50 can be loosely fitted. During assembly, the second bearing 22 is first fixed on the end cap body 21, and then the end cap body 21 is installed in the opening 11 of the housing 10. When installing the rotor assembly 50, the end of the rotor assembly 50 away from the mounting hole 12 passes through the second bearing 22. The connection method between the end cap body 21 and the housing 10 is not limited. For example, the end cap body 21 and the housing 10 can be riveted together.

[0038] In some embodiments, as shown in FIG1, a second bearing mounting portion 211 is formed by a partial protrusion of the end cap body 21 away from the mounting hole 12. A fixing hole communicating with the interior of the housing 10 is formed in the second bearing mounting portion 211, and the second bearing 22 is fixedly mounted in the fixing hole. By forming the second bearing mounting portion 211 by making a partial protrusion of the end cap body 21 away from the mounting hole 12, and forming a fixing hole in the second bearing mounting portion 211, the length of the fixing hole can be increased without increasing the overall thickness of the end cap body 21 to meet the installation requirements of the second bearing 22. Specifically, an axial limiting portion 212 is provided at one end of the second bearing mounting portion 211 away from the end cap body 21. The axial limiting portion 212 abuts against the side of the second bearing 22 opposite to the mounting hole 12 to axially limit the second bearing 22. During assembly, the second bearing 22 is pressed into the fixing hole of the second bearing mounting part 211. The second bearing 22 and the fixing hole are tightly fitted, so that the second bearing 22 abuts against the axial limiting part 212 to form an axial limit, preventing the second bearing 22 from coming out of the fixing hole.

[0039] In some embodiments, the axis of the first bearing 60, the axis of the inner bore of the stator assembly 30, and the axis of the second bearing 22 coincide. By aligning the axes of the first bearing 60, the inner bore of the stator assembly 30, and the second bearing 22, when the two ends of the rotor assembly 50 are respectively mounted on the first bearing 60 and the second bearing 22, it can be ensured that the rotor assembly 50 is located at the center of the inner bore of the stator assembly 30, thus preventing the rotor assembly 50 from being biased to one side and affecting normal operation.

[0040] In some embodiments, as shown in FIG1, the rotor assembly 50 includes a rotating shaft 51 and a magnet sleeve 52. The rotating shaft 51 passes through the inner hole of the stator assembly 30, and the magnet sleeve 52 is located in the inner hole of the stator assembly 30 and is fixedly sleeved on the rotating shaft 51. The diameter of the mounting hole 12 is greater than or equal to the outer diameter of the magnet sleeve 52. The first bearing 60 and the second bearing 22 are both sleeved on the rotating shaft 51. During assembly, the magnet sleeve 52 is first fitted onto the rotating shaft 51. The magnet sleeve 52 and the rotating shaft 51 can be loosely fitted and are fixed with glue. Then, the first bearing 60 is fitted onto the rotating shaft 51. The first bearing 60 and the rotating shaft 51 can also be loosely fitted and are fixed with glue. Since the diameter of the mounting hole 12 is greater than or equal to the outer diameter of the magnet sleeve 52, the fixed rotating shaft 51 and magnet sleeve 52 can be inserted into the housing 10 through the mounting hole 12, so that the rotating shaft 51 passes through the inner hole of the stator assembly 30, and the end of the rotating shaft 51 away from the first bearing 60 passes through the second bearing 22, so that the magnet sleeve 52 is located in the inner hole of the stator assembly 30, and the first bearing 60 is located in the mounting hole 12, and the first bearing 60 is fixed in the mounting hole 12 with glue. During operation, the magnet sleeve 52 cooperates with the stator assembly 30 to drive the magnet sleeve 52 to rotate, thereby driving the rotating shaft 51 to rotate.

[0041] In some embodiments, as shown in FIG1, the rotor assembly 50 further includes a first fixing sleeve 53 and a second fixing sleeve 54. The first fixing sleeve 53 and the second fixing sleeve 54 are fixedly sleeved on the rotating shaft 51 and respectively abut against the axial ends of the magnet sleeve 52. The diameter of the mounting hole 12 is greater than or equal to the outer diameter of the first fixing sleeve 53 and the second fixing sleeve 54. By fixing the first fixing sleeve 53 and the second fixing sleeve 54 on the rotating shaft 51, so that the first fixing sleeve 53 and the second fixing sleeve 54 abut against the opposite ends of the magnet sleeve 52, not only can the fixing effect on the magnet sleeve 52 be enhanced, and the axial displacement of the magnet sleeve 52 be avoided when the rotor assembly 50 rotates at high speed, but the balance problem of the rotor assembly 50 can also be solved. After the first fixing sleeve 53 and the second fixing sleeve 54 are installed, the rotor assembly 50 can be dynamically balanced. When the imbalance is large, the first fixing sleeve 53 and the second fixing sleeve 54 can be directly cut to achieve balance, thereby reducing the vibration of the brushless motor device during operation, reducing noise, and extending the service life of the brushless motor device. When assembling the rotor assembly 50, firstly, the magnet sleeve 52 is fitted onto the rotating shaft 51. The magnet sleeve 52 and the rotating shaft 51 can be loosely fitted and fixed with glue. Then, the first fixing sleeve 53 and the second fixing sleeve 54 are respectively fitted onto both ends of the rotating shaft 51. The first fixing sleeve 53 and the second fixing sleeve 54 can be tightly fitted onto the rotating shaft 51, so that the first fixing sleeve 53 and the second fixing sleeve 54 abut against the opposite ends of the magnet sleeve 52, completing the assembly of the rotor assembly 50. Then, the first bearing 60 is installed on the rotating shaft 51. Since the diameter of the mounting hole 12 is greater than or equal to the outer diameter of the first fixing sleeve 53, the second fixing sleeve 54, and the magnet sleeve 52, the entire rotor assembly 50 can be smoothly installed into the housing 10 through the mounting hole 12. Specifically, the first fixing sleeve 53 and the second fixing sleeve 54 can be copper sleeves or stainless steel sleeves. It should be noted that when the outer diameter of the magnet sleeve 52 is greater than the outer diameters of the first fixed sleeve 53 and the second fixed sleeve 54, the outer diameter of the magnet sleeve 52 is the maximum diameter of the rotor assembly 50. Conversely, when the outer diameters of the first fixed sleeve 53 and the second fixed sleeve 54 are greater than the outer diameter of the magnet sleeve 52, the outer diameters of the first fixed sleeve 53 and the second fixed sleeve 54 are the maximum diameter of the rotor assembly 50.

[0042] In some embodiments, as shown in FIG1, the first fixing sleeve 53 is located between the first bearing 60 and the magnet sleeve 52. The axial ends of the first fixing sleeve 53 abut against the magnet sleeve 52 and the first bearing 60, respectively. The brushless motor device also includes an elastic element 70, which is connected between the second fixing sleeve 54 and the end cap assembly 20. By having the opposite ends of the first fixing sleeve 53 abut against the magnet sleeve 52 and the first bearing 60, and by providing the elastic element 70 in the second fixing sleeve 54 and the end cap assembly 20, with both ends of the elastic element 70 connected to the second fixing sleeve 54 and the end cap assembly 20, axial limiting of the rotor assembly 50 can be achieved, preventing axial movement of the rotor assembly 50 during high-speed operation and improving the operational reliability of the brushless motor device. Specifically, the elastic element 70 is connected to the second bearing 22 in the end cap assembly 20, and the elastic element 70 can be a compression spring.

[0043] In some embodiments, as shown in FIG1, the end of the rotating shaft 51 near the first bearing 60 is located outside the housing 10, which serves as a power output end for driving other components to rotate.

[0044] The assembly process of the brushless motor device provided in this embodiment is as follows:

[0045] Welding of stator assembly 30 and Hall assembly 40 is performed on the outside of housing 10. The welded stator assembly 30 and Hall assembly 40 are then installed into housing 10 through opening 11. The stator assembly 30 and housing 10 can be loosely fitted and fixed with glue.

[0046] Assemble the end cap assembly 20, press the second bearing 22 into the fixing hole of the second bearing mounting part 211 of the end cap body 21, and the second bearing 22 and the fixing hole can be tightly fitted.

[0047] The end cap body 21 is installed in the opening 11 of the housing 10. The end cap body 21 and the housing 10 can be fixed by riveting to seal the opening 11.

[0048] Assemble the rotor assembly 50 by fitting the magnet sleeve 52 onto the rotating shaft 51. The magnet sleeve 52 and the rotating shaft 51 can be loosely fitted and fixed with glue. Then, insert the first fixing sleeve 53 and the second fixing sleeve 54 from both ends of the rotating shaft 51. The first fixing sleeve 53 and the rotating shaft 51 can be tightly fitted, and the second fixing sleeve 54 and the rotating shaft 51 can be tightly fitted, so that the first fixing sleeve 53 and the second fixing sleeve 54 abut against the opposite ends of the magnet sleeve 52, thus completing the assembly of the rotor assembly 50.

[0049] The first bearing 60 is sleeved on the rotating shaft 51. The first bearing 60 and the rotating shaft 51 can be loosely fitted and fixed by glue so that the first bearing 60 abuts against the first fixing sleeve 53; the elastic element 70 is sleeved on the rotating shaft 51.

[0050] The rotor assembly 50 is installed into the housing 10 through the mounting hole 12, and the rotating shaft 51 passes through the inner hole of the stator assembly 30 and the through hole 41 of the Hall assembly 40 in sequence. The end of the rotating shaft 51 away from the first bearing 60 passes through the second bearing 22, and the magnet sleeve 52 is located in the inner hole of the stator assembly 30. The two ends of the elastic element 70 are connected to the second bearing 22 and the magnet sleeve 52 respectively, and the first bearing 60 is located in the mounting hole 12. The first bearing 60 is fixed in the mounting hole 12 with glue; the assembly of the brushless motor device is completed.

[0051] It should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A brushless motor device, characterized in that, The device includes a housing, an end cap assembly, a stator assembly, a Hall effect sensor assembly, and a rotor assembly. The housing has openings and mounting holes at opposite ends. The end cap assembly is mounted in the openings. The stator assembly and the Hall effect sensor assembly are both mounted inside the housing. The rotor assembly passes through the inner hole of the stator assembly. The Hall effect sensor assembly is connected to the end of the stator assembly near the end cap assembly. The Hall effect sensor assembly has a through hole with a diameter smaller than the diameter of the portion of the rotor assembly located within the inner hole of the stator assembly. The end of the rotor assembly near the end cap assembly extends out of the inner hole of the stator assembly and passes through the through hole. The diameter of the opening is greater than or equal to the outer diameter of the stator assembly. The diameter of the mounting hole is smaller than the diameter of the opening but greater than or equal to the maximum diameter of the rotor assembly.

2. The brushless motor device of claim 1, wherein: The brushless motor device also includes a first bearing, which is sleeved on the rotor assembly and installed in the mounting hole. The outer diameter of the first bearing matches the diameter of the mounting hole.

3. The brushless motor device of claim 2, wherein: The end of the housing away from the opening partially protrudes in a direction away from the end cover assembly to form a first bearing mounting portion, and the mounting hole is formed inside the first bearing mounting portion.

4. The brushless motor device according to claim 2, characterized in that: The end cap assembly includes an end cap body and a second bearing. The end cap body is installed in the opening, and the second bearing is fixedly disposed on the end cap body and sleeved on the rotor assembly.

5. The brushless motor device of claim 4, wherein: The rotor assembly includes a rotating shaft and a magnet sleeve. The rotating shaft passes through the inner hole of the stator assembly. The magnet sleeve is located in the inner hole of the stator assembly and is fixedly sleeved on the rotating shaft. The diameter of the mounting hole is greater than or equal to the outer diameter of the magnet sleeve. The first bearing and the second bearing are both sleeved on the rotating shaft.

6. The brushless motor device of claim 5, wherein: The rotor assembly further includes a first fixed sleeve and a second fixed sleeve, both of which are fixedly sleeved on the rotating shaft and respectively abut against the axial ends of the magnet sleeve. The diameter of the mounting hole is greater than or equal to the outer diameter of the first fixed sleeve and the second fixed sleeve.

7. The brushless motor device of claim 6, wherein: The first fixing sleeve is located between the first bearing and the magnet sleeve, and the two axial ends of the first fixing sleeve abut against the magnet sleeve and the first bearing, respectively; the brushless motor device also includes an elastic element, and the two ends of the elastic element are connected to the second fixing sleeve and the end cover assembly, respectively.

8. The brushless motor device of claim 5, wherein: The end of the rotating shaft near the first bearing is located outside the housing.

9. The brushless motor device of claim 4, wherein: The end cap body partially protrudes away from the mounting hole to form a second bearing mounting portion. A fixing hole communicating with the interior of the housing is formed in the second bearing mounting portion, and the second bearing is fixedly installed in the fixing hole.

10. The brushless motor device according to claim 9, characterized in that: An axial limiting part is provided at one end of the second bearing mounting part away from the end cover body, and the axial limiting part abuts against the side of the second bearing opposite to the mounting hole.

Images