Brushless motor

Abstract

The utility model relates to the technical field of motors, and discloses a brushless motor, which comprises a stator support, a rotating shaft, a stator, a rotor and a PCB (Printed Circuit Board), an annular bulge is arranged in the middle of the stator support, the stator is fixedly arranged outside the annular bulge, a bearing is embedded in the annular bulge, the rotating shaft is rotatably connected with the annular bulge through the bearing, and the rotating shaft is rotatably connected with the PCB through the bearing. The rotor is sleeved outside the rotating shaft, the stator support is provided with threaded columns used for being connected with the outside, the threaded columns are evenly distributed around the circumference of the rotor, the threaded columns and the rotor are arranged on the same side of the stator support, and the PCB is located between the rotor and the stator support. The PCB is arranged close to the side wall of the stator support. The beneficial effects of the brushless motor are that the axial size of the brushless motor is reduced, the space between the stator support and the rotor is fully utilized, the PCB is reasonably arranged, the overall size of the brushless motor is reduced, and the production cost is reduced.

Description

Technical Field

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

[0002] A brushless DC motor consists of a motor main body and a driver, and is a typical mechatronic product. Since the brushless DC motor operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor under heavy-load starting with variable-frequency speed regulation, nor does it generate oscillations and loss of synchronization when the load changes suddenly.

[0003] The overall structure of the existing brushless motor is relatively complex. When the brushless motor is connected and used externally, threaded posts are generally arranged on the stator bracket. The threaded posts and the rotor are located on both sides of the stator bracket respectively, resulting in a relatively large axial dimension of the brushless motor and requiring a relatively large installation space. In addition, the space utilization rate between the stator bracket and the rotor is relatively low. When installing the PCB board, a separate installation space needs to be set, resulting in a relatively large overall size of the brushless motor and increasing the production cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a brushless motor, which reduces the axial dimension of the brushless motor. At the same time, it makes full use of the space between the stator bracket and the rotor, reasonably arranges the PCB board, reduces the overall size of the brushless motor, and reduces the production cost.

[0005] To achieve the above purpose, the utility model provides a brushless motor, which includes a stator bracket, a rotating shaft, a stator, a rotor and a PCB board. An annular protrusion is provided in the middle of the stator bracket. The stator is fixedly arranged outside the annular protrusion. A bearing is embedded in the annular protrusion. The rotating shaft is rotationally connected to the annular protrusion through the bearing. The rotor is sleeved outside the rotor. The stator bracket is provided with threaded posts for external connection. The threaded posts are circumferentially distributed around the rotor. The threaded posts and the rotor are arranged on the same side of the stator bracket. The PCB board is sleeved on the annular protrusion, and the PCB board is located between the rotor and the stator bracket. The PCB board is arranged close to the side wall of the stator bracket.

[0006] Furthermore, the stator bracket is provided with support posts opposite to the extending direction of the threaded posts. The support posts are used for connecting with an external gear transmission group.

[0007] Furthermore, the cross section of the threaded post is circular or polygonal or elliptical.

[0008] Further, the interior of the stator bracket is hollow and has an installation cavity with an opening at one end. The annular protrusion, the stator, and the rotor are all located in the installation cavity. A cover plate is detachably provided at the opening, and the end of the rotating shaft penetrates through the cover plate. Support columns are provided on the cover plate or the stator bracket.

[0009] Further, the PCB board is attached to the bottom wall of the installation cavity, and a wire passing hole is provided on the bottom wall of the installation cavity.

[0010] Further, a connecting shaft for external connection is provided on the outer wall of the stator bracket, and a limiting groove for installing a snap ring is provided at the end of the connecting shaft.

[0011] Further, a housing is further included. The interior of the housing is hollow and has a receiving cavity with an opening at one end. The housing covers the stator bracket. The annular protrusion, the stator, and the rotor are located in the receiving cavity. The end of the rotating shaft penetrates through the receiving cavity and can extend out of the receiving cavity.

[0012] Further, support columns are provided on the side of the housing away from the receiving cavity.

[0013] Further, the housing is provided with the threaded column.

[0014] Further, the number of the support columns is at least 2, and they are evenly distributed around the axis of the rotating shaft. The support columns are axially symmetrically arranged or rotationally symmetrically arranged on the stator bracket.

[0015] Compared with the prior art, the brushless motor according to the embodiment of the present invention has the following beneficial effects: The threaded column and the rotor are arranged on the same side of the stator bracket, reducing the axial size of the brushless motor. At the same time, the threaded columns are evenly distributed circumferentially around the rotor, which can reduce the risk of collision damage during the transportation of the brushless motor. In addition, the PCB board is located between the rotor and the stator bracket and is attached to the side wall of the stator bracket, making full use of the space between the stator bracket and the rotor, reasonably arranging the PCB board, reducing the overall size of the brushless motor, and lowering the production cost. Description of the Drawings

[0016] Figure 1 is a cross-sectional view of Embodiment 1 of the brushless motor provided by the present invention;

[0017] Figure 2 is a structural schematic diagram of Embodiment 1 of the brushless motor provided by the present invention;

[0018] Figure 3 is a cross-sectional view of Embodiment 2 of the brushless motor provided by the present invention;

[0019] Figure 4It is a schematic structural diagram of the stator bracket of Embodiment 2 of the brushless motor provided by the present utility model;

[0020] Figure 5 It is another schematic structural diagram of the stator bracket of Embodiment 2 of the brushless motor provided by the present utility model;

[0021] Figure 6 It is a schematic structural diagram of the rotating shaft of Embodiment 2 of the brushless motor provided by the present utility model;

[0022] Figure 7 It is a schematic structural diagram of Embodiment 3 of the brushless motor provided by the present utility model;

[0023] Figure 8 It is a reference diagram of the usage state of the brushless motor provided by the present utility model;

[0024] Figure 9 It is a reference diagram of the arrangement of the support columns of the brushless motor provided by the present utility model;

[0025] Figure 10 It is another reference diagram of the arrangement of the support columns of the brushless motor provided by the present utility model.

[0026] In the figure, 1, stator bracket; 10, installation cavity; 100, wire passing hole; 11, annular protrusion; 12, cover plate; 13, connecting shaft, 131, limiting groove; 2, rotating shaft; 3, stator; 4, rotor; 5, PCB board; 6, bearing; 7, threaded post; 8, support column; 9, housing; 91, accommodating cavity; a, driving gear; b, gear transmission group. Specific Embodiments

[0027] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", etc. in the present utility model is based on the positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device and element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0029] Embodiment 1

[0030] As Figure 1 , Figure 2As shown in the figure, a brushless motor according to a preferred embodiment of the present utility model includes a stator bracket 1, a rotating shaft 2, a stator 3, a rotor 4, and a PCB board 5. Among them, the stator bracket 1 serves as an installation carrier for installing other parts. Specifically, in order to facilitate the fixation of the stator 3, in this embodiment, an annular protrusion 11 is provided in the middle of the stator bracket 1, and the stator 3 is fixedly arranged outside the annular protrusion 11. In order to facilitate the rotational connection between the stator bracket 1 and the rotating shaft 2, a bearing 6 is embedded in the annular protrusion 11, and the rotating shaft 2 is rotationally connected to the annular protrusion 11 through the bearing 6. The rotor 4 is sleeved outside the rotating shaft 2 and can rotate synchronously with the rotating shaft 2 or relatively rotate. Further, in order to facilitate the connection of the entire brushless motor to the outside and at the same time reduce the size of the brushless motor in the axial direction, threaded columns 7 for connecting to the outside are provided on the stator bracket 1. The threaded columns 7 are evenly distributed circumferentially around the rotor 4, and the threaded columns 7 and the rotor 4 are arranged on the same side of the stator bracket 1. The threaded columns 7 can protect the rotor 4 and reduce the risk of collision damage during the transportation of the brushless motor. Further, in order to facilitate the fixation of the PCB board 5 and further reduce the size, the PCB board 5 is sleeved on the annular protrusion 11, and the PCB board 5 is located between the rotor 4 and the stator bracket 1, and the PCB board is arranged close to the side wall of the stator bracket 1.

[0031] In this embodiment, in order to facilitate the brushless motor to drive the external transmission component to work, such as Figure 1 , Figure 2 As shown, a support column 8 opposite to the extending direction of the threaded column 7 is provided on the stator bracket 1. The support column 8 is used to connect to the external gear transmission group b. The gear transmission group b can be set as a multi-stage transmission. A driving gear a for driving the gear transmission group b is provided at the end of the rotating shaft 2, and the driving gear a and the gear transmission group b are engaged for transmission to meet different transmission requirements.

[0032] Further, in order to facilitate the design of the threaded column 7, the cross-section of the threaded column 7 is circular or polygonal or elliptical, which can be adaptively adjusted according to actual production requirements. In this embodiment, preferably, the cross-section of the threaded column 7 is circular.

[0033] Embodiment 2

[0034] Such as Figure 3 , Figure 4 , Figure 5 As shown, this embodiment is a further improvement based on Embodiment 1, and the specific details are as follows:

[0035] Further, in order to better protect the rotor 4 and prevent the rotor 4 from colliding during operation and transportation, in this embodiment, the inside of the stator bracket 1 is hollow and an installation cavity 10 is provided with an opening at one end, as Figure 3As shown in the figure, the annular protrusion 11, the stator 3, and the rotor 4 are all located in the installation cavity 10. To facilitate the disassembly and assembly of the stator 3, the rotor 4, and the rotating shaft 2, a cover plate 12 is detachably provided at the opening. The end of the rotating shaft 2 penetrates through the cover plate 12. A support column 8 is provided on the cover plate 12 or the stator bracket 1. Among them, a driving gear a is provided at the end of the rotating shaft 2 that penetrates through the cover plate 12, and a gear transmission group b is provided on the support column 8. The driving gear a and the gear transmission group b are in meshing transmission.

[0036] Further, in this embodiment, to facilitate the arrangement of the PCB board 5, refer to Figure 3 Figure, Figure 5 , the PCB board 5 is sleeved on the annular protrusion 11 and is arranged in contact with the bottom wall of the installation cavity 10. To facilitate the wiring between the PCB board 5 and external devices, a wire passing hole 100 is opened on the bottom wall of the installation cavity 10 for wiring between the PCB board 5 and external devices.

[0037] Even further, in this embodiment, refer to Figure 3 , the threaded column 7 can be provided on the side wall or the end face side wall of the stator bracket 1. To facilitate the connection with external devices, in addition to providing the threaded column 7 on the stator bracket 1, refer to Figure 5 , a connecting shaft 13 connected to the outside can be provided on the outer wall of the stator bracket 1. That is, during installation, a shaft hole corresponding to the connecting shaft 13 is provided on the external device, and the connecting shaft 13 is inserted into the shaft hole. To limit the axial direction of the connecting shaft 13, a limiting groove 131 for installing a snap ring is opened at the end of the connecting shaft 13. During the design, at least one of the screw posts and the connecting shaft 13 should be retained, and it can be adjusted according to the actual installation situation. Even further, to further simplify the connection structure with external devices, refer to Figure 1 , Figure 6 , in this embodiment, the end of the rotating shaft 2 can penetrate through the stator bracket 1, and the end is located outside the stator bracket 1, which is used to form support or transmit torque when connecting with external devices. Among them, whether the end of the rotating shaft 2 penetrates through the stator bracket 1 can be adjusted according to the actual design requirements.

[0038] Embodiment 3

[0039] As Figure 7 shown, this embodiment is a further improvement based on Embodiment 1, and the details are as follows:

[0040] Further, to achieve the same protection effect on the rotor 4 as in Embodiment 2, in this embodiment, a housing 9 is further included. Specifically, the housing 9 is hollow inside and has an accommodating cavity 91 with one end open. The housing 9 covers the stator bracket 1. The annular protrusion 11, the stator 3, and the rotor 4 are located in the accommodating cavity 91. The end of the rotating shaft 2 penetrates through the accommodating cavity 91 and can extend outside the accommodating cavity 91. In this embodiment, refer toFigure 6 , in order to facilitate the connection with the external gear transmission group b, a support column 8 is provided on the side of the housing 9 away from the accommodation cavity 91. Further, in order to facilitate the connection with external equipment, a threaded post 7 is provided on the housing 9 or the stator bracket 1. The position and quantity of the threaded post 7 can be adaptively adjusted according to actual requirements.

[0041] In the above embodiment, the number of the support columns 8 is at least 2, and they are evenly distributed around the axis of the rotating shaft 2. The support columns 8 are axially symmetrically arranged or rotationally symmetrically arranged on the stator bracket 1. Among them, the length and diameter of the support columns 8 can be adjusted according to the actual layout of the gear transmission group b, and it is not required that the lengths and diameters of all the support columns 8 are the same. Refer to Figure 8 , Figure 9 , Figure 10 , and the layout mode of the support columns 8 can be synchronously adjusted according to the quantity and layout mode of the gear transmission group b.

[0042] In summary, the embodiment of the present utility model provides a brushless motor. The threaded post 7 and the rotor 4 are arranged on the same side of the stator bracket 1, reducing the size of the brushless motor in the axial direction. At the same time, the threaded posts 7 are evenly distributed circumferentially around the rotor 4, which can reduce the risk of collision damage during the transportation of the brushless motor. In addition, the PCB board 5 is located between the rotor 4 and the stator bracket 1, and the PCB board is arranged close to the side wall of the stator bracket 1, making full use of the space between the stator bracket 1 and the rotor 4, reasonably arranging the PCB board 5, reducing the overall size of the brushless motor, and reducing the production cost.

[0043] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can still be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A brushless motor, characterized in that: It includes a stator bracket, a rotating shaft, a stator, a rotor and a PCB board. An annular protrusion is provided in the middle of the stator bracket. The stator is fixedly provided outside the annular protrusion. A bearing is embedded in the annular protrusion. The rotating shaft is rotatably connected to the annular protrusion through the bearing. The rotor is sleeved on the outside of the rotating shaft. The stator bracket is provided with a threaded column for connecting with the outside. The threaded column is evenly distributed around the circumference of the rotor. The threaded column and the rotor are arranged on the same side of the stator bracket. The PCB board is sleeved on the annular protrusion, and the PCB board is located between the rotor and the stator bracket. The PCB board is arranged close to the side wall of the stator bracket.

2. The brushless motor according to claim 1, characterized in that: The stator bracket is provided with a support column opposite to the extending direction of the threaded column, and the support column is used to be connected to an external gear transmission group.

3. The brushless motor according to claim 1, characterized in that: The cross section of the threaded column is circular, polygonal or elliptical.

4. The brushless motor according to claim 1, characterized in that: The stator bracket is hollow inside and has an opening at one end to provide an installation cavity, the annular protrusion, the stator and the rotor are all located in the installation cavity, a cover plate is detachably provided at the opening, the end of the rotating shaft passes through the cover plate, and a support column is provided on the cover plate or the stator bracket.

5. The brushless motor according to claim 4, characterized in that: The PCB board is arranged in contact with the bottom wall of the installation cavity, and a threading hole is provided on the bottom wall of the installation cavity.

6. The brushless motor according to claim 4, characterized in that: The outer wall of the stator bracket is provided with a connecting shaft connected to the outside, and the end of the connecting shaft is provided with a limiting groove for installing a retaining ring.

7. The brushless motor according to claim 1, characterized in that: It also includes a shell, which is hollow inside and has an opening at one end to provide a receiving cavity. The shell cover is arranged on the stator bracket. The annular protrusion, the stator and the rotor are located in the receiving cavity. The end of the rotating shaft passes through the receiving cavity and can extend out of the receiving cavity.

8. The brushless motor according to claim 7, characterized in that: A support column is provided on one side of the shell away from the accommodating cavity.

9. The brushless motor according to claim 7, characterized in that: The housing is provided with the threaded column.

10. The brushless motor according to claim 2, 4 or 8, characterized in that: The number of the support columns is at least 2 and they are evenly distributed around the axis of the rotating shaft. The support columns are axially symmetrically arranged or rotationally symmetrically arranged on the stator bracket.

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