Hollow cup brushless direct current motor with low noise vibration

Abstract

The invention discloses a hollow cup brushless direct current motor with low noise vibration. The hollow cup brushless direct current motor comprises an outer shell and a sub hollow cup winding installed in the outer shell. A rear cover body is installed on the rear side of the outer shell. A connecting wire is installed in the lower portion of the rear cover body in a penetrating mode, and a Hall sensor is arranged on the front side of the connecting wire. The rear end of the rotating shaft rod is connected with the interior of the rear cover body through a bearing body. The front end of the rotating shaft rod is connected with the interior of the front cover body through a bearing body. According to the hollow cup brushless direct current motor with low noise and vibration, lubricating oil in the liquid storage frame with a circular ring-shaped structure is sprayed out through the inclined jet orifice when the liquid storage frame rotates in a reciprocating manner, so that the bearing body is lubricated well, and the mechanical noise and vibration of the bearing body are reduced; therefore, the coreless brushless direct current motor can be used in a low-noise vibration manner, and the service life of the coreless brushless direct current motor is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of coreless brushless DC motors, in particular to a coreless brushless DC motor with low noise and vibration. Background Art

[0002] Coreless brushless DC motors have a longer lifespan than brushless motors due to their brushless design. Coreless brushless DC motors are widely used in medical equipment, high-precision instruments, drones, and robots. However, there are still some problems with coreless brushless DC motors when they are used, such as: The patent name disclosed in the application number "CN202021389595.1" in the prior art is "A hollow cup brushless DC motor", which includes bearings, stators, rotors and rotor position sensor assemblies and other components. The positioning centers of the bearings, stators, rotors and Hall plate assemblies are on the coaxial centerline. The stator includes front cover, housing, annular stator core, stator hollow cup winding, support ring and adapter plate assembly and other components. The stator hollow cup winding is a concentric multi-layer winding, and the lead of the stator hollow cup winding is connected to the adapter plate assembly by welding leads. A bearing chamber is provided in the rear end cover of the rotor position sensor assembly and / or the front end cover of the stator, and an installation groove for placing an O-type rubber ring is provided in the bearing chamber; the O-type rubber ring elastically supports the bearing, effectively absorbs the vibration generated during the operation of the motor, and reduces the vibration and noise of the motor. A wave spring is also provided between the bearing and the corresponding end cover, and the wave spring provides the bearing preload of the motor and eliminates the axial assembly error of the motor; When the coreless brushless DC motor is in use, it simply uses an O-shaped rubber ring to elastically support the bearing, and then effectively absorbs the vibration generated during the operation of the motor, reducing the vibration and noise of the motor. However, when the bearing is used for a long time and encounters humid weather, the bearing will rust, which will cause the bearing to generate greater noise and vibration during use, thus affecting the use of the coreless brushless DC motor. Therefore, we propose a low-noise and vibration hollow cup brushless DC motor to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a hollow cup brushless DC motor with low noise and vibration, so as to solve the problem proposed in the above background technology that the hollow cup brushless DC motor currently on the market, when in use, simply uses an O-ring to elastically support the bearing, and then effectively absorbs the vibration generated during the operation of the motor, thereby reducing the vibration and noise of the motor operation. However, when the bearing is used for a long time and encounters humid weather, the bearing will rust, which will cause the bearing to generate greater noise and vibration when in use, thus affecting the use of the hollow cup brushless DC motor.

[0004] To achieve the above object, the present invention provides the following technical solution: a low-noise and vibration hollow cup brushless DC motor, comprising an outer shell, and a sub-hollow cup winding installed in the outer shell; The front side of the outer shell is equipped with a front cover body, and the rear side of the outer shell is equipped with a rear cover body; A rotating shaft is arranged inside the outer shell, a permanent magnet is installed outside the rotating shaft, and a stator hollow cup winding is arranged outside the permanent magnet; A connecting wire is installed through the lower interior of the rear cover body, and a Hall sensor is arranged on the front side of the connecting wire; The rear end of the rotating shaft is connected to the interior of the rear cover body through the bearing body; The front end of the rotating shaft is connected to the interior of the front cover body through the bearing body; The front cover body and the rear cover body are both grooved inside and are provided with liquid storage frames for storing and spraying lubricating oil.

[0005] Preferably, the front cover body and the rear cover body have the same internal structure, and a sealing plate body is installed on the outer side of the front cover body and the rear cover body; Through the above structure setting, The front end of the rotating shaft rod passes through the middle inner part of the sealing plate body on the front side surface of the front cover body.

[0006] Preferably, the rear end of the connecting wire passes through the sealing plate body at the rear side of the rear cover body.

[0007] Preferably, the Hall sensor is arranged inside the rear side of the outer shell, a permanent magnet and a stator hollow cup winding are arranged on the front side of the Hall sensor, and a rear end of a rotating shaft is arranged through the interior of the Hall sensor.

[0008] Preferably, the liquid storage frame is arranged in a circular ring-shaped structure, the interior of the liquid storage frame is arranged in a hollow structure, and a circle of inclined injection ports is provided on a side of the liquid storage frame close to the bearing body; By setting the above structure, the lubricating oil in the liquid storage frame can be sprayed onto the bearing body through the inclined spray port, so as to lubricate the bearing body and facilitate the bearing body to rotate well.

[0009] A convex plate with an inclined structure is installed on the outer side of the liquid storage frame, a connecting spring is connected below the convex plate, and both the convex plate and the connecting spring are installed in grooves opened in the front cover body and the rear cover body.

[0010] Through the arrangement of the above structure, the convex plate can be automatically driven to rotate in the opposite direction and reset through the stored force of the connecting spring in the later stage.

[0011] Preferably, a control rod with an inverted "T"-shaped structure at the lower end is provided through the interior of the front cover body and the rear cover body, a convex plate is provided at the lower end of the control rod, and the upper part of the control rod is connected to the connecting plate; The number of the connecting plates and the number of the control rods are arranged in a ratio of 1:2.

[0012] Through the arrangement of the above structure, the connecting plate can control the two control rods to rise and fall together at the same time, which is convenient to operate.

[0013] Preferably, a liquid inlet pipe made of a hose material is connected through the upper interior of the liquid storage frame; The liquid storage frame forms a reciprocating rotating structure through the convex plate, and the shape angle of the liquid storage frame is less than 90 degrees.

[0014] By setting the above structure, the coolant can be evenly sprayed from the injection port onto the bearing body during the reciprocating rotation of the liquid storage frame, which is convenient for lubricating the bearing body and avoiding mechanical noise and vibration of the bearing body.

[0015] Preferably, a cavity is provided inside the outer shell, the length of the cavity is smaller than the length of the outer shell, and the cavity is arranged in a circular ring-shaped structure, and the outer side of the outer shell is arranged in a concave-convex structure.

[0016] Through the arrangement of the above structure, the cavity arranged in the shape of a ring structure can store the coolant well, so that the coolant is evenly distributed around the outer side of the stator hollow cup winding to perform cooling operation.

[0017] Preferably, a row of heat-conducting rings in a circular ring shape is arranged in the cavity inside the outer shell, a circle of heat-conducting columns is installed on the outside of the heat-conducting rings, the outer ends of the heat-conducting columns pass through the outside of the outer shell, and the heat-conducting rings and the heat-conducting columns are both made of copper.

[0018] Through the arrangement of the above structure, the cooperation of the heat-conducting column and the heat-conducting ring can further discharge the heat in the coolant in the cavity, thereby facilitating the cooling operation of the coolant in the later stage.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the lubricating oil inside the liquid storage frame of the ring-shaped structure is ejected through the inclined injection port when the liquid storage frame reciprocates, thereby lubricating the bearing body well, thereby reducing the mechanical noise and vibration of the bearing body, so that the hollow cup brushless DC motor can be used with low noise and vibration, and the service life of the hollow cup brushless DC motor is improved. The specific contents are as follows: (1) By injecting lubricating oil into the liquid storage frame and then cooperating with the rapid lifting and lowering of the control rod, the convex plate can be reciprocatingly pressed downward, so that the liquid storage frame can reciprocate and rotate, and then the lubricating oil inside the liquid storage frame with a circular ring structure is sprayed out through the inclined injection port when the liquid storage frame reciprocates, so as to lubricate the bearing body well, prevent the bearing body from rusting, and then reduce the mechanical noise and vibration of the bearing body, so that the hollow cup brushless DC motor can be used with low noise and vibration, thereby prolonging the service life of the hollow cup brushless DC motor; By using the connecting spring in cooperation, the liquid storage frame can be reversely rotated and reset later, thereby making the liquid storage frame reciprocatingly rotate later; (2) The cavity opened inside the outer shell can store a certain amount of coolant, so that the coolant in the outer shell can cool the stator hollow cup winding, increase the heat dissipation area, and reduce the temperature of the stator hollow cup winding, thereby facilitating the use of the hollow cup brushless DC motor; Furthermore, the heat of the coolant in the cavity can be transferred to the heat-conducting column through the copper heat-conducting ring, and then the heat is transferred out through the copper heat-conducting column, thereby facilitating further cooling and heat dissipation of the coolant in the cavity, thereby extending the use time of the coolant in the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a rear view structural schematic diagram of the present invention; Figure 2 It is a front structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the rear cover body of the present invention; Figure 5 It is a cross-sectional structural diagram of the connection between the rear cover body and the control rod of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the liquid storage frame of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the control rod descending according to the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the outer shell of the present invention; Fig. 9 It is a schematic diagram of the cross-sectional structure of the outer shell of the present invention.

[0021] In the figure: 1. outer shell; 101. heat-conducting column; 102. heat-conducting ring; 103. cavity; 2. front cover body; 3. rear cover body; 4. rotating shaft; 5. sealing plate body; 6. connecting wire; 7. control rod; 71. connecting plate; 8. permanent magnet; 9. Hall sensor; 10. stator hollow cup winding; 11. bearing body; 12. liquid storage frame; 121. injection port; 122. convex plate; 123. connecting spring; 13. liquid inlet pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-Figure 9 , the present invention provides the following technical solutions: Embodiment 1: The coreless brushless DC motor in this embodiment can be used with low noise and vibration, thereby increasing the service life of the coreless brushless DC motor. Figure 1-Figure 7 As shown, it includes an outer shell 1, and a sub-hollow cup winding 10 installed in the outer shell 1; a front cover body 2 is installed on the front side of the outer shell 1, and a rear cover body 3 is installed on the rear side of the outer shell 1; A rotating shaft 4 is arranged inside the outer shell 1, a permanent magnet 8 is installed on the outside of the rotating shaft 4, and a stator hollow cup winding 10 is arranged on the outside of the permanent magnet 8; a connecting wire 6 is installed through the lower interior of the rear cover body 3, and a Hall sensor 9 is arranged on the front side of the connecting wire 6; the rear end of the rotating shaft 4 is connected to the interior of the rear cover body 3 through a bearing body 11; the front end of the rotating shaft 4 is connected to the interior of the front cover body 2 through the bearing body 11; the interiors of the front cover body 2 and the rear cover body 3 are both grooved with a liquid storage frame 12 for storing and spraying lubricating oil.

[0024] The internal structure of the front cover body 2 and the rear cover body 3 is the same, and a sealing plate body 5 is installed on the outside of the front cover body 2 and the rear cover body 3; the front end of the rotating shaft rod 4 passes through the middle of the sealing plate body 5 on the front side of the front cover body 2. The rear end of the connecting wire 6 passes through the sealing plate body 5 on the rear side of the rear cover body 3. The Hall sensor 9 is arranged inside the rear side of the outer shell 1, and the front side of the Hall sensor 9 is provided with a permanent magnet 8 and a stator hollow cup winding 10, and the interior of the Hall sensor 9 passes through the rear end of the rotating shaft rod 4. The liquid storage frame 12 is arranged in a circular ring shape, and the interior of the liquid storage frame 12 is a hollow structure. A circle of inclined injection ports 121 is provided on one side of the liquid storage frame 12 close to the bearing body 11, and the heat conductive ring 102 and the heat conductive column 101 are both made of copper; The outer side of the liquid storage frame 12 is installed with a convex plate 122 with an inclined structure, and a connecting spring 123 is connected to the lower side of the convex plate 122. The convex plate 122 and the connecting spring 123 are both installed in the grooves provided in the front cover body 2 and the rear cover body 3. The interior of the front cover body 2 and the rear cover body 3 are penetrated by a control rod 7 with an inverted "T"-shaped structure at the lower end, and a convex plate 122 is provided at the lower end of the control rod 7. The upper part of the control rod 7 is connected to a connecting plate 71; the number of connecting plates 71 and the number of control rods 7 are arranged in a ratio of 1:2. A liquid inlet pipe 13 made of a hose material is penetrated and connected to the upper part of the liquid storage frame 12; the liquid storage frame 12 forms a reciprocating rotating structure through the convex plate 122, and the shape angle of the liquid storage frame 12 is less than 90°; First, the entire hollow cup brushless DC motor is moved into the working area, and the output end of the rotating shaft rod 4 is connected to the external rotating part, and then the entire hollow cup brushless DC motor can be used. When in use, the connecting wire 6 is connected to the external power supply, and the connecting wire 6 energizes the hollow cup brushless DC motor, and then the current in the stator hollow cup winding 10 in the outer shell 1 is started to generate a magnetic field, and then the magnetic field will interact with the magnetic field on the permanent magnet 8, and then the permanent magnet 8 drives the rotating shaft rod 4 to rotate together, and then the rotating shaft rod 4 can drive the external rotating part to rotate, so that the hollow cup brushless DC motor can be used well; When it is necessary to lubricate the bearing bodies 11 in the front cover body 2 and the rear cover body 3, the seal at the upper end of the liquid inlet pipe 13 is first opened, and the liquid inlet pipe 13 is connected to the external liquid delivery mechanism. At this time, the external lubricating oil enters the liquid storage frame 12 with a hollow internal structure and a circular ring-shaped structure through the liquid inlet pipe 13. After the lubricating oil is injected, the liquid inlet pipe 13 is separated from the external liquid delivery mechanism, and the upper end of the liquid inlet pipe 13 is sealed by the seal. Then, the connecting plate 71 is manually pressed downward, and the connecting plate 71 drives the two control rods 7 to move downward together. At this time, the lower end of the control rod 7 pushes the convex plate 122 downward. At this time, since the grooves opened in the front cover body 2 and the rear cover body 3 limit the liquid storage frame 12, when the lower end of the control rod 7 pushes the convex plate 122 downward, the convex plate 122 moves downward with the center of the liquid storage frame 12 as the center. The convex plate 122 drives the liquid storage frame 12 to rotate. At the same time, the convex plate 122 squeezes the connecting spring 123 when it moves downward, so that the connecting spring 123 accumulates force, and then the connecting plate 71 moves upward. At this time, the connecting plate 71 drives the control rod 7 to move upward, and then the convex plate 122 is automatically driven to rotate and reset in the opposite direction through the accumulated force of the connecting spring 123, so that the convex plate 122 drives the liquid storage frame 12 to rotate and reset in the opposite direction. The operation is repeated in this way, so that the convex plate 122 drives the liquid storage frame 12 to rotate clockwise and counterclockwise reciprocatingly. Therefore, when the liquid storage frame 12 rotates, the lubricating oil inside is sprayed to the corresponding bearing body 11 through the inclined injection port 121, thereby lubricating the bearing body 11 well, avoiding that the bearing body 11 can reduce mechanical noise and vibration when in use, so that the hollow cup brushless DC motor can be used well. The angle of each rotation of the liquid storage frame 12 is less than 90°, so when the liquid storage frame 12 rotates, it only needs to pull the liquid inlet pipe 13 made of a hose material to a certain extent, and then the setting of the liquid inlet pipe 13 made of a hose material will not affect the rotation of the liquid storage frame 12. When the use is over, the convex plate 122 is pushed upward by the stored force of the connecting spring 123, so that the convex plate 122 pushes up the bottom of the control rod 7. The elastic force of the connecting spring 123 is greater than the gravity of the control rod 7 and the connecting plate 71, so it is convenient to place the control rod 7 and the connecting plate 71 well when not in use. The bottom end of the control rod 7 is in an inverted "T" shape, so the control rod 7 will not be separated from the front cover body 2 and the rear cover body 3; Embodiment 2: The hollow cup brushless DC motor in this embodiment can dissipate heat and cool the stator hollow cup winding 10 well, which is convenient for improving the heat dissipation efficiency of the stator hollow cup winding 10, so that the stator hollow cup winding 10 can be used well. For details, please refer to the attached Figure 8-Figure 9As shown, a cavity 103 is provided inside the outer shell 1, the length of the cavity 103 is smaller than the length of the outer shell 1, and the cavity 103 is arranged in a circular ring shape, and the outer side of the outer shell 1 is arranged in a concave-convex structure. Before using the hollow cup brushless DC motor, the water inlet on the top of the outer shell 1 is first connected to the external cooling water delivery mechanism, and then the external cooling water delivery mechanism delivers the cooling water to the cavity 103 in the circular ring structure inside the outer shell 1 through the water inlet, and then the hollow cup brushless DC motor can be used. When the hollow cup brushless DC motor is in use, the stator hollow cup winding 10 will generate heat. At this time, the cooling water in the cavity 103 is distributed in a circular ring shape around the outer side of the stator hollow cup winding 10, thereby cooling the outer side of the stator hollow cup winding 10 well, avoiding excessive heat of the stator hollow cup winding 10 and affecting the later use, so that the stator hollow cup winding 10 can be used well; Embodiment 3: On the basis of embodiment 2, a row of heat-conducting rings 102 with an annular structure are arranged in the cavity 103 in the outer shell 1, and a circle of heat-conducting columns 101 are installed on the outer side of the heat-conducting rings 102, and the outer ends of the heat-conducting columns 101 pass through the outer side of the outer shell 1. When the cooling water in the cavity 103 cools the stator hollow cup winding 10, the temperature of the cooling water in the cavity 103 increases. At this time, the multiple heat-conducting rings 102 with annular structures distributed at equal intervals will conduct the heat in the cooling water to the heat-conducting columns 101, and then the heat-conducting columns 101 will conduct the heat out. Since the outer ends of the heat-conducting columns 101 are exposed to the outside for use, the outside air can cool down the heat-conducting columns 101 very well, and then the heat-conducting columns 101 and the heat-conducting rings 102 cooperate well to cool down the cooling water, which not only improves the cooling effect of the cooling water, but also allows the cooling water to be used for a long time, thereby completing a series of tasks.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-noise and low-vibration hollow cup brushless DC motor, comprising an outer shell (1), and a sub-hollow cup winding (10) installed in the outer shell (1); A front cover body (2) is installed on the front side of the outer shell (1), and a rear cover body (3) is installed on the rear side of the outer shell (1); It is characterized in that Also includes: A rotating shaft (4) is arranged inside the outer shell (1), a permanent magnet (8) is installed on the outside of the rotating shaft (4), and a stator hollow cup winding (10) is arranged on the outside of the permanent magnet (8); A connecting wire (6) is installed through the lower interior of the rear cover body (3), and a Hall sensor (9) is provided on the front side of the connecting wire (6); The rear end of the rotating shaft (4) is connected to the interior of the rear cover body (3) via a bearing body (11); The front end of the rotating shaft (4) is connected to the interior of the front cover body (2) via a bearing body (11); The front cover body (2) and the rear cover body (3) are both grooved inside and are provided with a liquid storage frame (12) for storing and spraying lubricating oil.

2. A low-noise vibration coreless brushless DC motor according to claim 1, characterized in that: The front cover body (2) and the rear cover body (3) have the same internal structure, and a sealing plate body (5) is installed on the outer side of the front cover body (2) and the outer side of the rear cover body (3); The front end of the rotating shaft (4) passes through the middle interior of the sealing plate body (5) on the front side of the front cover body (2).

3. A low-noise and vibration coreless brushless DC motor according to claim 2, characterized in that: The rear end of the connecting wire (6) passes through the sealing plate body (5) on the rear side of the rear cover body (3).

4. A low noise vibration coreless brushless DC motor according to claim 1, characterized in that: The Hall sensor (9) is arranged inside the rear side of the outer shell (1), a permanent magnet (8) and a stator hollow cup winding (10) are arranged on the front side of the Hall sensor (9), and the rear end of the rotating shaft (4) is arranged through the interior of the Hall sensor (9).

5. The low-noise and vibration coreless brushless DC motor according to claim 1, characterized in that: The liquid storage frame (12) is arranged in a circular ring-shaped structure, the interior of the liquid storage frame (12) is arranged in a hollow structure, and a circle of inclined injection ports (121) are provided on a side surface of the liquid storage frame (12) close to the bearing body (11); A convex plate (122) with an inclined structure is installed on the outer side of the liquid storage frame (12), a connecting spring (123) is connected below the convex plate (122), and the convex plate (122) and the connecting spring (123) are both installed in grooves provided in the front cover body (2) and the rear cover body (3).

6. A low-noise and vibration coreless brushless DC motor according to claim 5, characterized in that: A control rod (7) having a lower end in an inverted "T"-shaped structure is provided through the interior of the front cover body (2) and the rear cover body (3); a convex plate (122) is provided at the lower end of the control rod (7); and the upper part of the control rod (7) is connected to a connecting plate (71); The number of the connecting plates (71) and the number of the control rods (7) are arranged in a ratio of 1:

2.

7. A low-noise and vibration coreless brushless DC motor according to claim 6, characterized in that: A liquid inlet pipe (13) made of a hose material is connected through the upper interior of the liquid storage frame (12); The liquid storage frame (12) forms a reciprocating rotating structure through the convex plate (122), and the shape angle of the liquid storage frame (12) is less than 90 degrees.

8. The low-noise and vibration coreless brushless DC motor according to claim 1, characterized in that: A cavity (103) is provided inside the outer shell (1), the length of the cavity (103) is smaller than the length of the outer shell (1), and the cavity (103) is arranged in a circular ring-shaped structure, while the outer side of the outer shell (1) is arranged in a concave-convex structure.

9. A low-noise and vibration coreless brushless DC motor according to claim 8, characterized in that: A row of heat-conducting rings (102) in a circular ring structure is arranged in the cavity (103) in the outer shell (1), and a circle of heat-conducting columns (101) is installed on the outer side of the heat-conducting rings (102). The outer ends of the heat-conducting columns (101) penetrate the outer side of the outer shell (1), and the heat-conducting rings (102) and the heat-conducting columns (101) are both made of copper.

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