Small brushless motor capable of reducing noise

Abstract

The utility model discloses a small brushless motor capable of reducing noise in the field of brushless motors, which comprises a shell and a sealing cover, a stator and a rotor are arranged in the shell, the shell is in sealing connection with the sealing cover, an elastic rubber layer is adhered to the outer surface of the stator, a sound-absorbing cotton layer is adhered to the inner surface of the rotor, and the sound-absorbing cotton layer is adhered to the outer surface of the shell. A main control circuit board is arranged in the shell, and a sound absorption foam layer is adhered to the surface of the main control circuit board; according to the small-sized brushless motor capable of reducing noise, by arranging the sound-absorbing cotton layer, the elastic rubber layer and the sound-absorbing foam layer, the brushless motor can better absorb noise generated during operation, and meanwhile, the closed shell structure can obstruct sound transmission, so that the noise reduction effect is greatly improved.

Description

Technical Field

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

[0002] As the name implies, a small brushless motor is a relatively small brushless motor without motor carbon brushes. This type of motor is widely used in many fields, and its characteristics include small size, light weight, high efficiency and low noise. The advantages of brushless motors make it suitable for occasions that have specific requirements for motor size, efficiency and speed, such as smart kitchens, medical equipment, pneumatic tools, experimental instruments, etc. Structurally, a small brushless motor consists of a motor body and a controller, which is a typical mechatronics product. The motor stator consists of a pair of independent windings (coils), and the rotor is a permanent magnet. Although the control circuit of the brushless motor is relatively complex, its automatic control operation mode avoids the starting winding problem of the synchronous motor under light load starting under DC variable frequency speed change, as well as the oscillation and loss of step that may occur when the load changes suddenly. In terms of working principle, the small brushless motor uses an electronic commutation device and a Hall sensor. When the motor is running, the coil remains stationary while the magnetic pole rotates. This design gives the brushless motor a long service life and good performance. However, due to the complexity of its control loop, it has strict requirements on the selection and use of components, so it needs to undergo strict reliability testing before use to ensure quality. In general, small brushless motors have become an indispensable and important component in modern industry and electronic products due to their unique advantages and wide application fields.

[0003] Existing small brushless motors also have the following defects: small brushless motors generate mechanical noise and electromagnetic noise when working. Mechanical noise is mainly caused by friction, which is caused by the mutual contact and friction between the mechanical parts inside the motor during movement. Electromagnetic noise is mainly caused by electromagnetic vibration. The reason for this noise is that the air gap magnetic field of the motor generates electromagnetic force, which generates radial force on the stator and rotor, causing vibration and noise. However, the current traditional small motors lack internal noise reduction structures when installed, which makes it difficult to filter and reduce the mechanical noise and electromagnetic noise generated when the small motor is driven, so that the small motor generates a large noise when working, affecting the use effect of the small motor. Utility Model Content

[0004] In order to overcome the deficiencies of the existing technical solutions, the utility model provides a small brushless motor with noise reduction, which can effectively solve the technical problem of high noise of the existing brushless motor.

[0005] The utility model solves the technical problem by adopting the following technical solution: a small brushless motor with noise reduction, comprising a shell and a sealing cover, wherein a stator and a rotor are arranged inside the shell, the shell is sealed and connected to the sealing cover, an elastic rubber layer is bonded to the outer surface of the stator, a sound-absorbing cotton layer is bonded to the inner surface of the rotor, a main control circuit board is arranged inside the shell, and a sound-absorbing foam layer is bonded to the surface of the main control circuit board.

[0006] Furthermore, the elastic rubber layer is bonded to the shell.

[0007] Furthermore, a plurality of buckling blocks are fixedly arranged on the side surface of the shell, a plurality of positioning grooves are arranged on the surface of the main control circuit board, and the plurality of buckling blocks are buckled and connected with the plurality of positioning grooves.

[0008] Furthermore, a main shaft is arranged in the middle of the stator and passes through the stator, and a circular hole is opened on the surface of the main control circuit board, and the main shaft passes through the circular hole.

[0009] Furthermore, an input bearing is fixedly provided at one end of the main shaft, an output bearing is fixedly provided at the other end of the main shaft, the main shaft passes through the sealing cover, and the output bearing is rotatably connected to the sealing cover.

[0010] Furthermore, a connecting wire is disposed on the surface of the main control circuit board, and the connecting wire passes through the sealing cover and extends to the outside of the sealing cover.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model is a small brushless motor with noise reduction. By arranging a sound-absorbing cotton layer, an elastic rubber layer, and a sound-absorbing foam layer, the brushless motor can better absorb the noise generated during operation. At the same time, the closed shell structure can block the transmission of sound, thereby greatly improving the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a three-dimensional diagram of a noise-reducing small brushless motor of the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of a small brushless motor with noise reduction according to the utility model;

[0014] Figure 3 It is a side view of a small brushless motor with noise reduction according to the utility model;

[0015] Figure 4 This is a schematic diagram of the internal structure of a housing of a small brushless motor with noise reduction according to the utility model;

[0016] Figure 5 The utility model is a schematic structural diagram of a stator and a rotor of a small brushless motor with noise reduction.

[0017] Numbers in the figure:

[0018] 1-housing; 2-connecting wire; 3-sealing cover; 4-stator; 5-elastic rubber layer; 6-rotor; 7-main control circuit board; 8-fastening block; 9-sound-absorbing cotton layer; 10-main shaft; 11-output bearing; 12-round hole; 13-input bearing; 14-positioning groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-Figure 5 As shown, a noise-reducing small brushless motor includes a shell 1 and a sealing cover 3, wherein a stator 4 and a rotor 6 are arranged inside the shell 1, wherein the shell 1 is sealed and connected to the sealing cover 3, an elastic rubber layer 5 is bonded to the outer surface of the stator 4, and the elastic rubber layer 5 is bonded to the shell 1, thereby enhancing the sealing and stability between the stator 4 and the shell 1, and helping to prevent the transmission of noise and vibration. At the same time, this structure can also effectively protect the stator 4 and extend the service life of the motor, a sound-absorbing cotton layer 9 is bonded to the inner surface of the rotor 6, a main control circuit board 7 is arranged inside the shell 1, and a sound-absorbing foam layer is bonded to the surface of the main control circuit board 7.

[0021] The elastic rubber layer 5 is bonded to the shell 1, and a plurality of snap-fit ​​blocks 8 are fixedly provided on the side of the shell 1. A plurality of positioning grooves 14 are provided on the surface of the main control circuit board 7. The plurality of snap-fit ​​blocks 8 are snap-fitted with the plurality of positioning grooves 14. The snap-fitted connection between the snap-fit ​​blocks 8 and the positioning grooves 14 enables the rapid installation and removal of the main control circuit board 7. This design simplifies the assembly and maintenance process of the motor and improves the work efficiency. A main shaft 10 that crosses the stator 4 is provided in the middle of the stator 4. A circular hole 12 is provided on the surface of the main control circuit board 7. The main shaft 10 passes through the circular hole 12. This structure ensures the stability and accuracy of the main shaft 10, while reducing the friction and vibration inside the motor, which helps to reduce noise. The main shaft 1 0 is fixedly provided with an input bearing 13 at one end, and an output bearing 11 is fixedly provided at the other end of the main shaft 10, the main shaft 10 passes through the sealing cover 3, and the output bearing 11 is rotatably connected to the sealing cover 3. This design makes the input and output of the motor smoother, reduces energy loss and noise generation, and at the same time, the setting of the sealing cover 3 also enhances the sealing of the motor, preventing impurities such as dust and moisture from entering the inside of the motor. A connecting line 2 is provided on the surface of the main control circuit board 7, and the connecting line 2 passes through the sealing cover 3 and extends to the outside of the sealing cover 3. The setting of the connecting line 2 allows the motor to be connected to an external device or a power supply, which is convenient for users to control and operate.

[0022] A small brushless motor with noise reduction in this embodiment can better absorb the noise generated during operation by providing a sound-absorbing cotton layer 9, an elastic rubber layer 5, and a sound-absorbing foam layer. At the same time, the closed shell 1 structure can block the transmission of sound, greatly improving the noise reduction effect.

[0023] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A small brushless motor with noise reduction, comprising a housing and a sealing cover, wherein a stator and a rotor are arranged inside the housing, characterized in that: The shell is sealed and connected to the sealing cover, an elastic rubber layer is bonded to the outer surface of the stator, a sound-absorbing cotton layer is bonded to the inner surface of the rotor, a main control circuit board is arranged inside the shell, and a sound-absorbing foam layer is bonded to the surface of the main control circuit board.

2. A small brushless motor with noise reduction according to claim 1, characterized in that: The elastic rubber layer is bonded to the shell.

3. A small brushless motor with noise reduction according to claim 1, characterized in that: A plurality of buckling blocks are fixedly arranged on the side surface of the shell, a plurality of positioning grooves are arranged on the surface of the main control circuit board, and the plurality of buckling blocks are buckled and connected with the plurality of positioning grooves.

4. A small brushless motor with noise reduction according to claim 1, characterized in that: A main shaft that crosses the stator is arranged in the middle of the stator, and a round hole is opened on the surface of the main control circuit board, and the main shaft passes through the round hole.

5. A small brushless motor with noise reduction according to claim 4, characterized in that: An input bearing is fixedly arranged at one end of the main shaft, and an output bearing is fixedly arranged at the other end of the main shaft. The main shaft passes through the sealing cover, and the output bearing is rotatably connected to the sealing cover.

6. A small brushless motor with noise reduction according to any one of claims 1 to 5, characterized in that: A connecting wire is arranged on the surface of the main control circuit board, and the connecting wire passes through the sealing cover and extends to the outside of the sealing cover.

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