An outer rotor brushless motor with speed detection

Abstract

The present invention discloses an outer rotor brushless motor with a speed detection function, which relates to the technical field of outer rotor brushless motors, and includes a housing, a magnetic ring and an output shaft, wherein the inner part of the housing is glued with a magnetic ring. The protective cover is flipped by pushing it, and when the No. 1 sealing gasket and the No. 2 sealing gasket are tightly fitted, the locking frame is stuck in the locking groove, thereby locking the closed protective cover, so that moisture and dust can be effectively prevented from entering the wiring terminal, thereby ensuring the stability and safety of the circuit. After the protective cover is closed, the No. 1 sealing gasket and the No. 2 sealing gasket, as well as the No. 1 sealing gasket, the No. 2 sealing gasket and the connecting wire are tightly fitted, so that the dustproof and waterproof performance can be further improved, and at the same time, the mechanical strength of the wiring terminal can be enhanced, and the reliability of the motor can be improved. Through this waterproof and dustproof structure, the probability of poor contact, short circuit and other faults caused by environmental factors is significantly reduced, thereby enhancing the overall reliability of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of outer rotor brushless motors, in particular to an outer rotor brushless motor with a rotation speed detection function. Background Art

[0002] Motor, also known as electric motor, engine, etc., is generally divided into brushed motor and brushless motor according to whether it has carbon brushes or not. Brushless motor is often divided into inner rotor brushless motor and outer rotor brushless motor according to the setting form of its rotor. The outer rotor brushless motor is based on the Lorentz force principle. When the permanent magnet and stator coil in the motor are energized, a magnetic field is generated to drive the rotor to rotate. Through advanced electronic control technology, precise control of the motor speed and direction can be achieved. Compared with the inner rotor brushless motor, the outer rotor brushless motor has the advantages of high efficiency, high torque, low noise, etc., and because there is no carbon brush wear problem, it has a longer service life.

[0003] At present, when a traditional outer rotor brushless motor is in use, the connecting wires of the outer rotor brushless motor and the wiring terminals of the PCB board are usually exposed, making the motor extremely susceptible to external environmental intrusion such as dust and moisture during use. The accumulation of dust can easily lead to poor contact of the wiring terminals, affecting the normal operation of the motor; and the infiltration of moisture may cause a short circuit, causing more serious damage to the motor, which not only affects the performance and stability of the motor, but also greatly shortens its service life. Summary of the invention

[0004] Based on this, an object of the present invention is to provide an outer rotor brushless motor with speed detection to solve the technical problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an outer rotor brushless motor with speed detection, comprising a shell, a magnetic ring and an output shaft, wherein the inside of the shell is glued with a magnetic ring, the magnetic ring is arranged on the outside of a stator group, a mounting seat is arranged on one side of the shell, a screw hole is opened on one side of the mounting seat, a screw sleeve is connected to the internal thread of the screw hole, a first bearing and a second bearing are arranged on the inner sides of the screw sleeve and the mounting seat respectively, one side of the first bearing is connected to a meson through a first washer, a second washer is connected between the second bearing and the shell, one end of the output shaft passes through the first bearing, the meson, and the second bearing and is arranged at the opening of the central axis hole, a Hall sensor is installed on one side of the stator group, a PCB board is installed on the side of the mounting seat close to the shell, and one end of the PCB board is connected to a connecting wire through a terminal;

[0006] A protective cover located outside the terminal is provided on one side of the PCB board, and a No. 1 sealing gasket and a No. 2 sealing gasket are respectively provided on the side where the protective cover and the PCB board are close to each other. A rebound mechanism connected to the PCB board is provided at one end of the protective cover, and the rebound mechanism includes a vertical plate, a torsion spring and a support shaft, and the support shaft is connected to both sides of the protective cover. A locking mechanism connected to the PCB board is provided at the other end of the protective cover, and the locking mechanism includes a support frame, a telescopic spring, a locking frame and a locking groove, and the locking groove is opened at the bottom end of the protective cover.

[0007] Preferably, a vertical plate is provided on one side of the PCB board above the protective cover, and the protective cover and the vertical plate form a rotating structure through a supporting shaft.

[0008] Preferably, a torsion spring is connected between the protective cover and the vertical plate, and the protective cover and the vertical plate form an elastic structure through the torsion spring.

[0009] Preferably, two of the vertical plates and the supporting shafts are symmetrically arranged about the central axis of the protective cover, and the ends of the vertical plates are arranged to be arc-shaped.

[0010] Preferably, a support frame is provided on one side of the PCB board below the protective cover, and a locking frame is slidably connected to the interior of the support frame.

[0011] Preferably, a telescopic spring constituting an elastic structure is connected between the locking frame and the supporting frame, and the protective cover and the supporting frame form a locking structure through the locking frame and the locking groove.

[0012] Preferably, the locking frame is composed of a lifting rod and a locking plate, and one end of the locking plate is provided with an inclined surface.

[0013] In summary, the present invention mainly has the following beneficial effects:

[0014] 1. The present invention is provided with a protective cover, a locking mechanism and a rebound mechanism. Since the protective cover is rotatably connected to the vertical plate through a support shaft, the protective cover can be flipped by pushing it. Since the locking frame is elastically connected to the support frame through a telescopic spring and one end of the locking frame is provided with an inclined surface, when the No. 1 sealing gasket and the No. 2 sealing gasket are tightly fitted, the locking frame is clamped into the locking groove, thereby locking the closed protective cover, so that moisture and dust can be effectively prevented from entering the wiring terminal, thereby ensuring the stability and safety of the circuit. After the protective cover is closed, the No. 1 sealing gasket and the No. 2 sealing gasket, as well as the No. 1 sealing gasket, the No. 2 sealing gasket and the connecting wire are tightly fitted, so that the dustproof and waterproof performance can be further improved, and the mechanical strength of the wiring terminal can be enhanced, and the reliability of the motor can be improved. Through this waterproof and dustproof structure, the probability of poor contact, short circuit and other faults caused by environmental factors is significantly reduced, thereby enhancing the overall reliability of the equipment;

[0015] 2. The present invention installs a Hall sensor on the stator assembly so that when the rotor rotates, the magnetic field generated by the magnet will rotate with the rotor. The Hall sensor will capture this change and convert it into an electrical signal. By processing this electrical signal, the rotor speed information can be obtained, thereby facilitating the detection of the speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 3 It is a three-dimensional exploded view of the rebound mechanism and the locking mechanism of the present invention;

[0019] Figure 4 It is a schematic diagram of the front cutaway structure of the rebound mechanism and the locking mechanism of the present invention.

[0020] In the figure: 1. housing; 2. magnetic ring; 3. output shaft; 4. stator assembly; 5. mounting seat; 6. PCB board; 7. screw hole; 8. screw sleeve; 9. first bearing; 10. meson; 11. first gasket; 12. second bearing; 13. center shaft hole; 14. second gasket; 15. Hall sensor; 16. No. 2 sealing gasket; 17. connecting wire; 18. terminal; 19. rebound mechanism; 1901. vertical plate; 1902. torsion spring; 1903. support shaft; 20. protective cover; 21. locking mechanism; 2101. support frame; 2102. telescopic spring; 2103. locking frame; 2104. locking groove; 22. No. 1 sealing gasket. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] The following describes an embodiment of the present invention based on its overall structure.

[0023] An outer rotor brushless motor with speed detection, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, it includes a shell 1, a magnetic ring 2 and an output shaft 3, the inside of the shell 1 is glued with a magnetic ring 2, the magnetic ring 2 is arranged on the outside of the stator group 4, a mounting seat 5 is arranged on one side of the shell 1, a screw hole 7 is opened on one side of the mounting seat 5, a screw sleeve 8 is connected to the inner thread of the screw hole 7, a first bearing 9 and a second bearing 12 are arranged on the inner sides of the screw sleeve 8 and the mounting seat 5, one side of the first bearing 9 is connected with a meson 10 through a first washer 11, a second washer 14 is connected between the second bearing 12 and the shell 1, one end of the output shaft 3 passes through the first bearing 9, the meson 10, the second bearing 12 and is arranged at the opening of the central shaft hole 13, a PCB board 6 is installed on the side of the mounting seat 5 close to the shell 1, and one end of the PCB board 6 is connected with a connecting line 17 through a terminal 18;

[0024] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that the mounting seat 5 includes an annular plate and a cylinder arranged on one side of the annular plate, and one side of the cylinder extends to the inside of the outer shell 1, one side of the annular plate is connected to the PCB board 6, and the stator group 4 is set on the outside of the cylinder. The stator group 4 includes an iron core and a winding, and the iron core and the winding are both arranged on the outside of the output shaft 3. The first bearing 9 and the second bearing 12 are both ball bearings. The inner rings of the first bearing 9 and the second bearing 12 are fixed on the output shaft 3. The outer ring of the first bearing 9 can move outward with the screw sleeve 8 to a predetermined position, and the preload can be fine-tuned to improve the accuracy and reduce the defects of the first bearing 9 and the second bearing 12 caused by the preload problem. It can effectively prevent the axial stringing of the transmission shaft, reduce friction and noise, reduce vibration, avoid its rigidity deterioration, improve work efficiency, and meet the use requirements.

[0025] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that a Hall sensor 15 is installed on one side of the stator group 4;

[0026] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that by installing the Hall sensor 15 on the stator group 4, when the rotor rotates, the magnetic field generated by the magnet will rotate with the rotor, and the Hall sensor 15 will capture this change and convert it into an electrical signal. By processing this electrical signal, the rotor speed information can be obtained, which makes it easier to detect the speed.

[0027] See also Figure 1 , Figure 2 , Figure 3 and Figure 4It can be seen that a protective cover 20 located outside the terminal 18 is provided on one side of the PCB board 6, and a No. 1 sealing gasket 22 and a No. 2 sealing gasket 16 are respectively provided on the side where the protective cover 20 and the PCB board 6 are close to each other. A rebound mechanism 19 connected to the PCB board 6 is provided at one end of the protective cover 20, and the rebound mechanism 19 includes a vertical plate 1901, a torsion spring 1902 and a support shaft 1903. The support shaft 1903 is connected to both sides of the protective cover 20. A vertical plate 1901 is arranged above the protective cover 20 on one side of 6, and the protective cover 20 and the vertical plate 1901 form a rotating structure through a support shaft 1903. A torsion spring 1902 is connected between the protective cover 20 and the vertical plate 1901, and the protective cover 20 and the vertical plate 1901 form an elastic structure through the torsion spring 1902. Two vertical plates 1901 and the support shaft 1903 are symmetrically arranged about the central axis of the protective cover 20, and the end of the vertical plate 1901 is arranged in an arc shape;

[0028] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that, since the protective cover 20 is rotatably connected to the vertical plate 1901 through the support shaft 1903, the protective cover 20 can be turned over by pushing it. Since the protective cover 20 is elastically connected to the vertical plate 1901 through the torsion spring 1902, after the locking frame 2103 is separated from the locking groove 2104, the protective cover 20 will deflect and reset with the support shaft 1903 as the axis under the action of the torsion spring 1902, and then the wiring operation can be carried out, thereby preventing the wiring operation from being hindered.

[0029] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that when the protective cover 20 is in a closed state, it can effectively prevent moisture and dust from entering the terminal 18, thereby ensuring the stability and safety of the circuit. After the protective cover 20 is closed, the No. 1 sealing gasket 22 and the No. 2 sealing gasket 16, as well as the No. 1 sealing gasket 22, the No. 2 sealing gasket 16 and the connecting line 17 are all tightly fitted, so that the dust and water resistance can be further improved. At the same time, the mechanical strength of the terminal 18 can be enhanced, and the reliability of the motor can be improved. Through this waterproof and dustproof structure, the probability of poor contact, short circuit and other faults caused by environmental factors is significantly reduced, thereby enhancing the overall reliability of the equipment.

[0030] See also Figure 1 , Figure 2 , Figure 3 and Figure 4It can be known that the other end of the protective cover 20 is provided with a locking mechanism 21 connected to the PCB board 6, and the locking mechanism 21 includes a support frame 2101, a telescopic spring 2102, a locking frame 2103 and a locking groove 2104. The locking groove 2104 is provided at the bottom end of the protective cover 20. One side of the PCB board 6 is provided with a support frame 2101 below the protective cover 20. The locking frame 2103 is slidably connected inside the support frame 2101. The telescopic spring 2102 constituting an elastic structure is connected between the locking frame 2103 and the support frame 2101. The protective cover 20 and the support frame 2101 form a snap-fit ​​structure through the locking frame 2103 and the locking groove 2104. The locking frame 2103 is composed of a lifting rod and a locking plate, and one end of the locking plate is provided with an inclined surface.

[0031] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that since the locking frame 2103 is elastically connected to the support frame 2101 through the telescopic spring 2102, and one end thereof is provided with a slope, when the No. 1 sealing gasket 22 and the No. 2 sealing gasket 16 are tightly fitted, the locking frame 2103 is inserted into the locking groove 2104, thereby achieving the locking of the closed protective cover 20.

[0032] The working principle of the present invention is as follows: when using the outer rotor brushless motor with speed detection, a Hall sensor 15 is installed on the stator group 4, so that when the rotor rotates, the magnetic field generated by the magnet will rotate with the rotor, and the Hall sensor 15 will capture this change and convert it into an electrical signal. By processing this electrical signal, the rotor speed information can be obtained, which is then convenient for realizing the detection of the speed. When it is necessary to connect the connecting wire 17 and the terminal 18 of the PCB board 6, the locking frame 2103 is pulled to disengage it from the locking groove 2104. At this time, the protective cover 20 will be deflected and reset with the support shaft 1903 as the axis under the action of the torsion spring 1902, and then the wiring operation can be carried out. The main control end PWM output has a total of 80 speed adjustment gears, with a duty cycle of 50% as the limit, that is, 2% to 50% is divided into 40 levels corresponding to a speed of 180rpm to 2000rpm, and each level increases or decreases by 45rpm. 52% to 100% is divided into 40 levels corresponding to a speed of 2000rpm to 9000rpm, with each level increasing or decreasing by 175rpm. The motor runs to the set speed according to the PWM duty cycle. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0033] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An outer rotor brushless motor with a speed detection function, comprising a housing (1), a magnetic ring (2) and an output shaft (3), characterized in that: A magnetic ring (2) is glued to the inside of the housing (1), and the magnetic ring (2) is arranged on the outside of the stator group (4). A mounting seat (5) is arranged on one side of the housing (1), and a screw hole (7) is opened on one side of the mounting seat (5). A screw sleeve (8) is connected to the inner thread of the screw hole (7). A first bearing (9) and a second bearing (12) are arranged on the inner side of the screw sleeve (8) and the mounting seat (5), respectively. One side of the first bearing (9) is connected to a meson (10) via a first washer (11). ), a second washer (14) is connected between the second bearing (12) and the housing (1), one end of the output shaft (3) passes through the first bearing (9), the meson (10), and the second bearing (12) and is arranged at the opening of the central axis hole (13), a Hall sensor (15) is installed on one side of the stator group (4), a PCB board (6) is installed on the side of the mounting seat (5) close to the housing (1), and one end of the PCB board (6) is connected to a connecting wire (17) through a terminal (18); A protective cover (20) located outside the wiring terminal (18) is provided on one side of the PCB board (6); a first sealing gasket (22) and a second sealing gasket (16) are respectively provided on the side where the protective cover (20) and the PCB board (6) are close to each other; a rebound mechanism (19) connected to the PCB board (6) is provided at one end of the protective cover (20); the rebound mechanism (19) comprises a vertical plate (1901), a torsion spring (1902) and a support shaft (1903); the support shaft (1903) is connected to both sides of the protective cover (20); a locking mechanism (21) connected to the PCB board (6) is provided at the other end of the protective cover (20); the locking mechanism (21) comprises a support frame (2101), a telescopic spring (2102), a locking frame (2103) and a locking groove (2104); the locking groove (2104) is opened at the bottom end of the protective cover (20).

2. The outer rotor brushless motor with speed detection according to claim 1, characterized in that: A vertical plate (1901) is provided on one side of the PCB board (6) above the protective cover (20), and the protective cover (20) and the vertical plate (1901) form a rotating structure via a support shaft (1903).

3. The outer rotor brushless motor with speed detection according to claim 1, characterized in that: A torsion spring (1902) is connected between the protective cover (20) and the vertical plate (1901), and the protective cover (20) and the vertical plate (1901) form an elastic structure through the torsion spring (1902).

4. The outer rotor brushless motor with speed detection according to claim 1, characterized in that: Two of the vertical plates (1901) and the support shafts (1903) are symmetrically arranged about the central axis of the protective cover (20), and the ends of the vertical plates (1901) are arranged in an arc shape.

5. The outer rotor brushless motor with speed detection according to claim 1, characterized in that: A support frame (2101) is provided on one side of the PCB board (6) and is located below the protective cover (20), and a locking frame (2103) is slidably connected inside the support frame (2101).

6. The outer rotor brushless motor with speed detection according to claim 5, characterized in that: A telescopic spring (2102) constituting an elastic structure is connected between the locking frame (2103) and the supporting frame (2101), and the protective cover (20) and the supporting frame (2101) form a snap-fit ​​structure via the locking frame (2103) and the locking groove (2104).

7. The outer rotor brushless motor with speed detection according to claim 6, characterized in that: The locking frame (2103) is composed of a lifting rod and a locking plate, and one end of the locking plate is provided with an inclined surface.

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