Structure for improving vibration noise of brushless motor

Abstract

The utility model relates to the technical field of brushless motors, in particular to a structure for improving vibration noise of a brushless motor, which is characterized in that an elastic structure is additionally arranged between a rotor and a bearing seat of a casing, absorbs energy generated by vibration of the rotor and converts the energy into elastic potential energy, and meanwhile, damping between the rotor and the bearing seat of the casing is increased; the vibration absorption and buffering effects are achieved, and transmission of shafting vibration is directly isolated; comprising a driving mechanism; the motor further comprises a noise reduction mechanism and an air guide mechanism, the noise reduction mechanism is installed on the driving mechanism and prevents the rotor from generating vibration noise during movement, and the air guide mechanism is installed on the noise reduction mechanism and rotates to suck air.

Description

Technical Field

[0001] This utility model relates to the technical field of brushless motors, and in particular to a structure for improving the vibration and noise of brushless motors. Background Technology

[0002] One of the main reasons for the high vibration and noise of brushless motors is mechanical noise. For rotating machinery, vibration and noise have obvious order, with low-order vibration and noise having high energy and being the main focus of attention.

[0003] Existing structures for improving the vibration and noise of brushless motors, such as the noise-reducing small brushless motor disclosed in utility model patent application number 202421105488.X, mainly include a housing and a sealing cover. The housing contains a stator and a rotor, and the housing is sealed to the sealing cover. An elastic rubber layer is bonded to the outer surface of the stator, and a sound-absorbing cotton layer is bonded to the inner surface of the rotor. A main control circuit board is located inside the housing, and a sound-absorbing foam layer is bonded to the surface of the main control circuit board. In use, the sound-absorbing cotton layer, elastic rubber layer, and sound-absorbing foam layer enable the brushless motor to better absorb the noise generated during operation, while the enclosed housing structure can block the transmission of sound.

[0004] However, shaft vibration is mainly caused by the rotor's dynamic imbalance, dimensional deviation, coaxiality deviation, etc. The rotor vibrates, and the vibration is transmitted through the rotor to the housing or bearing seat, causing the air to vibrate and generate noise. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a structure that improves the vibration and noise of a brushless motor by adding an elastic structure between the rotor and the housing bearing seat. The elastic structure absorbs the energy generated by the rotor vibration and converts it into elastic potential energy. At the same time, it increases the damping between the rotor and the housing bearing seat, playing a role in vibration absorption and buffering, and directly isolating the transmission of shaft vibration.

[0006] This utility model discloses a structure for improving the vibration and noise of a brushless motor, including a drive mechanism; it also includes a noise reduction mechanism and an air guide mechanism. The noise reduction mechanism is installed on the drive mechanism to prevent vibration and noise from being generated when the rotor moves, and the air guide mechanism is installed on the noise reduction mechanism and rotates to draw in air. Through the elastic structure set in the axial and radial directions of the rotor, the vibration transmission between the rotor and the housing bearing seat is completely isolated, thereby achieving the purpose of reducing the vibration and noise of the brushless motor.

[0007] Preferably, the drive mechanism includes an upper cover and a stator assembly. The upper cover is mounted on the working surface, and the stator assembly is mounted on the upper cover. When the power is turned on, the stator assembly generates a magnetic field to drive the rotor to rotate.

[0008] Preferably, the noise reduction mechanism includes a rotor assembly, a first axial rubber pad, a second axial rubber pad, sixteen sets of springs, and sixteen sets of spring housings. The rotor assembly is rotatably mounted on the stator assembly. Two sets of bearings are installed on the rotor assembly, and bearings have bearing grooves. The first axial rubber pad is installed in the bearing groove, the second axial rubber pad is installed in the bearing groove, and eight sets of fixing holes are opened on the bearings. The sixteen sets of springs are respectively installed in the fixing holes of the two sets of bearings, and the sixteen sets of spring housings are respectively installed on the sixteen sets of springs. The magnetic field drives the rotor assembly to rotate. By setting the first axial rubber pad and the second axial rubber pad, the axial vibration of the rotor assembly is isolated. The radial vibration of the rotor assembly is isolated by the sixteen sets of springs and spring housings, and the vibration energy is absorbed and dissipated, thereby achieving the purpose of reducing the vibration noise of the brushless motor.

[0009] Preferably, the first axial rubber pad and the second axial rubber pad are made of NR material.

[0010] Preferably, the air guiding mechanism includes an impeller, a lower cover, an air guide housing, and a fan shroud. The impeller is mounted on the rotor assembly, the lower cover is mounted on the rotor assembly, the air guide housing is mounted on the upper cover, and the fan shroud is mounted on the air guide housing. The rotor assembly drives the impeller to rotate, and the rotation of the impeller accelerates the airflow and enhances the heat dissipation effect of the motor.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting elastic structures in the axial and radial directions of the rotor, the vibration transmission between the rotor and the housing bearing seat is completely isolated, thereby achieving the purpose of reducing the vibration noise of the brushless motor. Attached Figure Description

[0012] Figure 1 This is an exploded view of the structure of this utility model;

[0013] Figure 2 This is a front view cross-sectional structural diagram of the drive mechanism and air guide mechanism of this utility model;

[0014] Figure 3 This is an exploded view of the noise reduction mechanism of this utility model;

[0015] Figure 4 This is an isometric structural diagram of the noise reduction mechanism of this utility model;

[0016] Figure 5 This is a front view cross-sectional structural diagram of the noise reduction mechanism of this utility model.

[0017] The following labels are used in the attached diagram: 01, drive mechanism; 11, upper cover; 12, stator assembly; 02, noise reduction mechanism; 21, rotor assembly; 22, first axial rubber pad; 23, second axial rubber pad; 24, spring; 25, spring housing; 03, air guide mechanism; 31, impeller; 32, lower cover; 33, air guide housing; 34, fan shroud. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0019] like Figures 1 to 5 As shown, this utility model discloses a structure for improving the vibration and noise of a brushless motor, including a drive mechanism 01; it also includes a noise reduction mechanism 02 and an air guide mechanism 03. The noise reduction mechanism 02 is mounted on the drive mechanism 01 to prevent vibration and noise during rotor movement, and the air guide mechanism 03 is mounted on the noise reduction mechanism 02 and rotates to draw in air. The drive mechanism 01 includes an upper cover 11 and a stator assembly 12. The upper cover 11 is mounted on the working surface, and the stator assembly 12 is mounted on the upper cover 11. The noise reduction mechanism 02 includes a rotor assembly 21, a first axial rubber pad 22, a second axial rubber pad 23, sixteen sets of springs 24, and sixteen sets of spring shells 25. The rotor assembly 21 is rotatably mounted on the stator assembly 12. Two sets of bearings are mounted on the rotor assembly 21, and bearing grooves are formed on the bearings. The first axial rubber pad 22 is installed in the bearing groove, the second axial rubber pad 23 is installed in the bearing groove, and eight sets of fixing holes are formed on the bearings. The sixteen sets of springs 24 are respectively installed on the fixing holes of the two sets of bearings. Inside the hole, sixteen sets of spring housings 25 are respectively installed on sixteen sets of springs 24; it also includes a first axial rubber pad 22 and a second axial rubber pad 23 made of NR material; the air guide mechanism 03 includes an impeller 31, a lower cover 32, an air guide housing 33 and a fan shroud 34. The impeller 31 is installed on the rotor assembly 21, the lower cover 32 is installed on the rotor assembly 21, the air guide housing 33 is installed on the upper cover 11, and the fan shroud 34 is installed on the air guide housing 33; when it is working, firstly, the power is turned on, and the stator assembly 12 generates a magnetic field to drive the rotor assembly 21 to rotate. The rotor assembly 21 drives the impeller 31 to rotate. The rotation of the impeller 31 accelerates the air flow and enhances the heat dissipation effect of the motor. By setting the first axial rubber pad 22 and the second axial rubber pad 23, the axial vibration of the rotor assembly 21 is isolated. By using the sixteen sets of springs 24 and spring housings 25 to isolate the radial vibration of the rotor assembly 21, the vibration energy is absorbed and dissipated, thereby achieving the purpose of reducing the vibration noise of the brushless motor.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A structure for improving the vibration and noise of a brushless motor, comprising a drive mechanism (01); characterized in that, It also includes a noise reduction mechanism (02) and an air guide mechanism (03). The noise reduction mechanism (02) is installed on the drive mechanism (01) to prevent vibration noise from being generated when the rotor moves. The air guide mechanism (03) is installed on the noise reduction mechanism (02) and rotates to draw in air.

2. The structure for improving vibration and noise of a brushless motor as described in claim 1, characterized in that, The drive mechanism (01) includes a top cover (11) and a stator assembly (12), with the top cover (11) mounted on the working surface and the stator assembly (12) mounted on the top cover (11).

3. The structure for improving vibration and noise of a brushless motor as described in claim 2, characterized in that, The noise reduction mechanism (02) includes a rotor assembly (21), a first axial rubber pad (22), a second axial rubber pad (23), sixteen sets of springs (24) and sixteen sets of spring shells (25). The rotor assembly (21) is rotatably mounted on the stator assembly (12). Two sets of bearings are mounted on the rotor assembly (21), and bearing grooves are opened on the bearings. The first axial rubber pad (22) is installed in the bearing groove, the second axial rubber pad (23) is installed in the bearing groove, and eight sets of fixing holes are opened on the bearings. The sixteen sets of springs (24) are respectively installed in the fixing holes of the two sets of bearings, and the sixteen sets of spring shells (25) are respectively installed on the sixteen sets of springs (24).

4. The structure for improving vibration and noise of a brushless motor as described in claim 3, characterized in that, It also includes a first axial rubber pad (22) and a second axial rubber pad (23) made of NR material.

5. The structure for improving vibration and noise of a brushless motor as described in claim 3, characterized in that, The air guide mechanism (03) includes an impeller (31), a lower cover (32), an air guide housing (33), and a shroud (34). The impeller (31) is mounted on the rotor assembly (21), the lower cover (32) is mounted on the rotor assembly (21), the air guide housing (33) is mounted on the upper cover (11), and the shroud (34) is mounted on the air guide housing (33).

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