Permanent magnet direct current brushless motor

Abstract

The utility model discloses a permanent magnet direct current brushless motor, which comprises a rotor assembly, a stator assembly, a front end cover and a rear end cover, the front end cover comprises a front end wall and a front peripheral wall which is formed by bending and extending the peripheral edge of the front end wall towards one side, and the rear end cover comprises a rear end wall and a rear peripheral wall which is formed by bending and extending the peripheral edge of the rear end wall towards one side; the front end cover and the rear end cover respectively sleeve two ends of the stator assembly, and the stator assembly, the front peripheral wall and the rear peripheral wall are coaxially arranged; the rotor assembly is arranged on the inner side of the stator assembly, and the rotor assembly is rotationally connected with the front end cover and the rear end cover. According to the permanent magnet direct current brushless motor, when the shell and the stator assembly are assembled, only the front end cover and the rear end cover need to be sleeved at the two ends of the stator assembly respectively, a cylindrical shell structure which is difficult to process and high in cost is eliminated, mass production is facilitated, the concentricity of the shell and the stator assembly can be ensured more conveniently, the concentricity of the whole motor is further improved, and the service life of the motor is prolonged. The reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless motors, in particular to a permanent magnet direct current brushless motor. Background Art

[0002] The permanent magnet direct current brushless motor is a kind of brushless motor. The existing shell of the permanent magnet direct current brushless motor usually includes a cylindrical casing and a front end cover and a rear end cover assembled at both ends of the casing. During the assembly process of the permanent magnet direct current brushless motor, it is necessary to first press the stator assembly into the casing, and then assemble the front and rear end covers at the front and rear ends of the casing. Due to the thin wall thickness and long total length of the casing, it will cause great processing difficulty, high cost, be not conducive to mass production, and cannot well guarantee the concentricity of the motor and other problems. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a permanent magnet direct current brushless motor with higher concentricity and conducive to mass production.

[0004] In order to solve the above technical problem, the technical scheme adopted by the utility model is: a permanent magnet direct current brushless motor, including a rotor assembly, a stator assembly, a front end cover and a rear end cover. The front end cover includes a front end wall and a front peripheral wall formed by bending and extending the outer peripheral edge of the front end wall to one side. The rear end cover includes a rear end wall and a rear peripheral wall formed by bending and extending the outer peripheral edge of the rear end wall to one side. The front end cover and the rear end cover are respectively sleeved at both ends of the stator assembly. The stator assembly, the front peripheral wall and the rear peripheral wall are coaxially arranged. The rotor assembly is arranged inside the stator assembly and is respectively rotationally connected with the front end cover and the rear end cover.

[0005] Further, it also includes a PCB assembly, the PCB assembly is fixedly connected to the rear end cover, and the PCB assembly is electrically connected to the stator assembly.

[0006] Further, the stator assembly includes a wire frame and a stator core installed on the wire frame. A plurality of PIN pins are arranged on the wire frame. A guiding hole for the PIN pins to pass through is opened on the rear end wall. The PIN pins are welded to the PCB assembly.

[0007] Further, it also includes an induction magnetic ring assembly. The induction magnetic ring assembly is coaxial and fixedly connected with the rotor assembly. The PCB assembly includes a PCB board and an encoder arranged on the PCB board.

[0008] Further, a receiving groove is arranged on the outer side surface of the rear end wall, and the PCB assembly is arranged in the receiving groove.

[0009] Further, the PCB assembly is connected to the rear end cover by screws.

[0010] Further, bearings are provided between the front end cover and the rotor assembly, and bearings are provided between the rear end cover and the rotor assembly.

[0011] Further, positioning posts are provided on the inner side of the front end wall and / or the rear end wall, and the stator assembly is inserted and cooperated with the positioning posts.

[0012] The beneficial effects of the present utility model are as follows: When assembling the housing and the stator assembly of this permanent magnet brushless DC motor, only the front end cover and the rear end cover need to be sleeved on both ends of the stator assembly respectively, eliminating the difficult-to-process and high-cost cylindrical housing structure, which is beneficial to reducing the processing procedures, improving the efficiency, facilitating mass production, and can more conveniently ensure the concentricity between the housing and the stator assembly, thereby improving the overall concentricity of the motor and increasing the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the permanent magnet brushless DC motor according to Embodiment 1 of the present utility model;

[0014] Figure 2 It is an exploded view of the permanent magnet brushless DC motor according to Embodiment 1 of the present utility model;

[0015] Figure 3 It is an exploded view of the stator assembly in the permanent magnet brushless DC motor according to Embodiment 1 of the present utility model;

[0016] Figure 4 It is a cross-sectional view of the rear end cover in the permanent magnet brushless DC motor according to Embodiment 1 of the present utility model;

[0017] Figure 5 It is a cross-sectional view of the front end cover in the permanent magnet brushless DC motor according to Embodiment 1 of the present utility model.

[0018] Reference Numerals:

[0019] 1. Rotor assembly;

[0020] 2. Stator assembly; 21. Wire holder; 211. PIN pin; 22. Stator core;

[0021] 31. Front end cover; 311. Front end wall; 312. Front peripheral wall; 32. Rear end cover; 321. Rear end wall; 322. Rear peripheral wall; 323. Accommodation groove; 324. Positioning post;

[0022] 4. PCB assembly; 41. PCB board; 42. Encoder;

[0023] 5. Inductive magnetic ring assembly;

[0024] 6. Bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To describe in detail the technical content, achieved objectives and effects of the present utility model, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 5 , a permanent magnet brushless DC motor, comprising a rotor assembly 1, a stator assembly 2, a front end cover 31 and a rear end cover 32. The front end cover 31 includes a front end wall 311 and a front peripheral wall 312 formed by bending and extending from the outer peripheral edge of the front end wall 311 towards one side. The rear end cover 32 includes a rear end wall 321 and a rear peripheral wall 322 formed by bending and extending from the outer peripheral edge of the rear end wall 321 towards one side. The front end cover 31 and the rear end cover 32 are respectively sleeved on both ends of the stator assembly 2. The stator assembly 2, the front peripheral wall 312 and the rear peripheral wall 322 are coaxially arranged. The rotor assembly 1 is arranged inside the stator assembly 2, and the rotor assembly 1 is respectively rotatably connected to the front end cover 31 and the rear end cover 32.

[0027] As can be seen from the above description, the beneficial effects of the present utility model are as follows: When assembling the outer shell and the stator assembly of this permanent magnet brushless DC motor, only the front end cover and the rear end cover need to be respectively sleeved on both ends of the stator assembly, eliminating the difficult-to-machine and high-cost cylindrical casing structure, which is conducive to reducing the processing procedures, improving the efficiency, facilitating mass production, and can more conveniently ensure the concentricity between the outer shell and the stator assembly 2, thereby improving the overall concentricity of the motor and increasing the reliability.

[0028] Furthermore, it further includes a PCB assembly 4. The PCB assembly 4 is fixedly connected to the rear end cover 32, and the PCB assembly 4 is electrically connected to the stator assembly 2.

[0029] As can be seen from the above description, the PCB assembly 4 is used to control the current of the stator assembly 2, thereby controlling the rotation of the rotor assembly 1.

[0030] Furthermore, the stator assembly 2 includes a wire frame 21 and a stator core 22 installed on the wire frame 21. A plurality of PIN pins 211 are provided on the wire frame 21. A guiding hole for the PIN pins 211 to pass through is formed on the rear end wall 321, and the PIN pins 211 are welded to the PCB assembly 4.

[0031] As can be seen from the above description, the PIN pins 211 function as lead wires, which facilitate processing while ensuring the insulation performance of the motor, improving the efficiency and facilitating subsequent production.

[0032] Furthermore, it further includes an induction magnetic ring assembly 5. The induction magnetic ring assembly 5 is coaxially and fixedly connected to the rotor assembly 1. The PCB assembly 4 includes a PCB board 41 and an encoder 42 provided on the PCB board 41.

[0033] As described above, the PCB board 41 can cooperate with the encoder 42 and the induction magnetic ring assembly 5 to monitor the rotation angle stroke of the rotor assembly 1 in real time, so as to accurately control the rotation angle of the rotor assembly 1.

[0034] Furthermore, a receiving groove 323 is provided on the outer side surface of the rear end wall 321, and the PCB assembly 4 is disposed in the receiving groove 323.

[0035] As described above, the receiving groove 323 is used to limit the position of the PCB assembly 4 and can protect the PCB assembly 4.

[0036] Furthermore, the PCB assembly 4 is connected to the rear end cover 32 by screws.

[0037] As described above, the connection method between the PCB assembly 4 and the rear end cover 32 is simple and convenient for disassembly and assembly.

[0038] Furthermore, a bearing 6 is provided between the front end cover 31 and the rotor assembly 1, and a bearing 6 is provided between the rear end cover 32 and the rotor assembly 1.

[0039] As described above, the setting of the bearing 6 can reduce the friction force and make the rotation of the rotor assembly 1 smoother.

[0040] Furthermore, positioning posts 324 are provided on the inner side of the front end wall 311 and / or the rear end wall 321, and the stator assembly 2 is inserted and cooperated with the positioning posts 324.

[0041] As described above, the positioning posts 324 can further improve the concentricity between the front end cover 31 and / or the rear end cover 32 and the stator assembly 2.

[0042] Please refer to Figures 1 to 5, Embodiment 1 of the present utility model is: A permanent magnet direct current brushless motor, which includes a rotor assembly 1, a stator assembly 2 and a housing. The housing includes a front end cover 31 and a rear end cover 32. The front end cover 31 includes a front end wall 311 and a front peripheral wall 312 formed by bending and extending from the outer peripheral edge of the front end wall 311 towards one side. The rear end cover 32 includes a rear end wall 321 and a rear peripheral wall 322 formed by bending and extending from the outer peripheral edge of the rear end wall 321 towards one side; the front end cover 31 and the rear end cover 32 are respectively sleeved on both ends of the stator assembly 2, and the stator assembly 2, the front peripheral wall 312 and the rear peripheral wall 322 are coaxially arranged; the rotor assembly 1 is arranged inside the stator assembly 2, and the rotor assembly 1 is respectively rotatably connected to the front end cover 31 and the rear end cover 32. Specifically, both the front peripheral wall 312 and the rear peripheral wall 322 are cylindrical. The outer diameter of the stator assembly 2 is equal to the inner diameters of the front end cover 31 and the rear end cover 32. A through hole for the rotor assembly 1 to pass through is provided on the front end wall 311. It is easy to understand that when assembling the housing and the stator assembly of this permanent magnet direct current brushless motor, only the front end cover 31 and the rear end cover 32 need to be respectively sleeved on both ends of the stator assembly 2, eliminating the difficult-to-process and high-cost cylindrical casing structure, which is beneficial to reducing the processing procedures, improving the efficiency, facilitating mass production, and can more conveniently ensure the concentricity of the housing and the stator assembly 2, thereby improving the overall concentricity of the motor and increasing the reliability.

[0043] As Figure 1 and Figure 2 shown, the permanent magnet direct current brushless motor further includes a PCB assembly 4. The PCB assembly 4 is fixedly connected to the rear end cover 32, and the PCB assembly 4 is electrically connected to the stator assembly 2. Specifically, the stator assembly 2 includes a wire frame 21 and a stator core 22 installed on the wire frame 21. A plurality of PIN pins 211 are provided on the wire frame 21. A guiding hole for the PIN pins 211 to pass through is provided on the rear end wall 321, and the PIN pins 211 are welded to the PCB assembly 4. The end face of the wire frame 21 coincides with the end face of the guiding hole, which is beneficial to reducing the redundant internal space and shortening the overall length of the motor.

[0044] As Figure 1 and Figure 2 shown, the permanent magnet direct current brushless motor further includes an induction magnetic ring assembly 5. The induction magnetic ring assembly 5 is coaxially and fixedly connected to the rotor assembly 1. The PCB assembly 4 includes a PCB board 41 and an encoder 42 provided on the PCB board 41. The PCB board 41 can cooperate with the induction magnetic ring assembly 5 through the encoder 42 to monitor the rotation angle stroke of the rotor assembly 1 in real time, so as to accurately control the rotation angle of the rotor assembly 1.

[0045] As Figure 1 , Figure 2 and Figure 4As shown, a receiving groove 323 is provided on the outer side surface of the rear end wall 321. The PCB assembly 4 is disposed in the receiving groove 323. The receiving groove 323 is used to limit the position of the PCB assembly 4 and can protect the PCB assembly 4. The PCB assembly 4 is connected to the rear end cover 32 by screws.

[0046] As Figure 1 and Figure 2 shown, in order to make the rotation of the rotor assembly 1 smoother, a bearing 6 is provided between the front end cover 31 and the rotor assembly 1, and a bearing 6 is provided between the rear end cover 32 and the rotor assembly 1.

[0047] As a preferred embodiment, a positioning post 324 is provided inside the rear end wall 321. The stator assembly 2 is in plug-in fit with the positioning post 324. The positioning post 324 can further improve the concentricity between the rear end cover 32 and the stator assembly 2. In other embodiments, it is also feasible that a positioning post 324 is provided inside the front end wall 311 and the stator assembly 2 is in plug-in fit with the positioning post 324.

[0048] In summary, for the permanent magnet brushless DC motor provided by the present invention, when assembling the housing and the stator assembly, only the front end cover and the rear end cover need to be sleeved on both ends of the stator assembly respectively, eliminating the difficult-to-process and high-cost cylindrical housing structure, which is beneficial to reducing the processing procedures, improving the efficiency, facilitating mass production, and can more conveniently ensure the concentricity between the housing and the stator assembly, thereby improving the overall concentricity of the motor and increasing the reliability.

[0049] The above are only the embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A permanent magnet brushless DC motor, characterized in that: It includes a rotor assembly, a stator assembly, a front end cover and a rear end cover. The front end cover includes a front end wall and a front peripheral wall formed by bending and extending from the outer peripheral edge of the front end wall towards one side. The rear end cover includes a rear end wall and a rear peripheral wall formed by bending and extending from the outer peripheral edge of the rear end wall towards one side. The front end cover and the rear end cover are respectively sleeved on both ends of the stator assembly. The stator assembly, the front peripheral wall and the rear peripheral wall are coaxially arranged. The rotor assembly is arranged inside the stator assembly, and the rotor assembly is respectively rotatably connected to the front end cover and the rear end cover.

2. The permanent magnet brushless DC motor according to claim 1, characterized in that: It further includes a PCB assembly, the PCB assembly is fixedly connected to the rear end cover, and the PCB assembly is electrically connected to the stator assembly.

3. The permanent magnet brushless DC motor according to claim 2, characterized in that: The stator assembly includes a wire frame and a stator core mounted on the wire frame. The wire frame is provided with a plurality of PIN pins. The rear end wall is provided with a guiding hole for the PIN pins to pass through, and the PIN pins are welded to the PCB assembly.

4. The permanent magnet direct current brushless motor according to claim 2, characterized in that: It further includes an induction magnetic ring assembly. The induction magnetic ring assembly is coaxially and fixedly connected to the rotor assembly. The PCB assembly includes a PCB board and an encoder arranged on the PCB board.

5. The permanent magnet brushless DC motor according to claim 2, wherein: A receiving groove is provided on the outer side surface of the rear end wall, and the PCB assembly is arranged in the receiving groove.

6. The permanent magnet brushless DC motor according to claim 2, wherein: The PCB assembly and the rear end cover are connected by screws.

7. The permanent magnet brushless DC motor according to claim 1, wherein: A bearing is provided between the front end cover and the rotor assembly, and a bearing is provided between the rear end cover and the rotor assembly.

8. The permanent magnet brushless DC motor according to claim 1, characterized in that: A positioning post is provided inside the front end wall and / or the rear end wall, and the stator assembly is inserted and matched with the positioning post.

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