A motor for reducing low-frequency vibration and a processing method thereof

Abstract

The present invention relates to the field of machinery, and more specifically to a motor for reducing low-frequency vibration and a processing method thereof, comprising the following steps: performing high-speed dynamic balancing at 5000 revolutions on a main shaft that is at least 1 mm thickened and at most 2 mm thickened; performing high-speed dynamic balancing at 5000 revolutions after fixing an armature core on the main shaft; fixing a main magnetic pole and a brush in a shell provided with through holes, and installing a porous material on the inner wall of a connecting shell; installing a shock-absorbing seat inside a motor housing, and then installing a connecting shell inside the motor housing and connecting it to the shock-absorbing seat; installing a rotor on the connecting shell through a bearing, and installing a fan blade on the main shaft located outside the motor housing; the present application will not affect the installation effect and heat dissipation effect of the motor, and can achieve the purpose of reducing noise from the source.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and more particularly to a motor capable of reducing low-frequency vibration and a processing method thereof. Background Art

[0002] An electric motor, commonly known as a "motor", is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque as a power source for electrical appliances or various machines.

[0003] Most existing motors use external shock-absorbing mechanisms or internal shock-absorbing systems to reduce low-frequency vibrations and reduce noise. The external shock-absorbing mechanisms are mostly directly installed on the motor housing and are used for shock absorption after the motor is installed. This requires the shock-absorbing mechanism to be connected to the motor installation area. Therefore, the shock-absorbing mechanism needs to be installed in a matching manner with the motor and the installation area, which has high limitations.

[0004] The internal shock absorbing system mostly uses carbon brushes and collector rings. When the motor vibrates, the shock absorbing system will also vibrate continuously, causing the carbon brushes and collector rings to be constantly rubbed, which can easily lead to wear and damage due to friction. In addition, the carbon brushes and collector rings are also sensitive to temperature and can be easily damaged by temperature differences, affecting the stability and life of the motor. Summary of the invention

[0005] Based on this, the present application provides a motor and a processing method thereof that can reduce low-frequency vibration without affecting the installation effect and heat dissipation effect of the motor and can achieve the purpose of reducing noise from the source.

[0006] In a first aspect, the present application provides a motor for reducing low-frequency vibration and a processing method thereof, comprising the following steps:

[0007] 1) Perform high-speed dynamic balancing at 5000 rpm on a spindle that is at least 1 mm thicker and at most 2 mm thicker;

[0008] 2) After fixing the armature core on the main shaft, perform high-speed dynamic balancing at 5000 revolutions. Then, install the coil and commutator on the armature core and main shaft respectively and keep them balanced with the main shaft to complete the assembly of the rotor.

[0009] 3) Fix the main magnetic pole and the brush in a shell provided with through holes, install a porous material on the inner wall of the connecting shell, and then fix the shell inside the connecting shell so that the armature core is located inside the main magnetic pole and the brush is in contact with the commutator;

[0010] 4) Open a heat dissipation port on the outside of the motor housing, install a shock-absorbing seat inside the motor housing, and then install the connecting shell inside the motor housing and connect it to the shock-absorbing seat;

[0011] 5) Install the rotor on the connecting shell through the bearing, and install the fan blade on the main shaft outside the motor housing;

[0012] 6) Fix the heat sink assembly to the connecting shell through the heat dissipation opening.

[0013] In one possible implementation, the coil described in step 2) is wound using an electronic tension controller and a tension controller to accurately control the tension of the enameled wire A and the enameled wire B, maintain the balance of the rotor after winding, and reduce low-frequency vibration caused by rotor imbalance.

[0014] In a possible implementation, the porous material described in step 3) is evenly arranged on the entire inner wall of the connecting shell and surrounds the shell provided with the through holes.

[0015] In a possible implementation, the shell described in step 3) is a non-metallic cylinder, and the through holes are evenly distributed on the cylinder.

[0016] In a possible implementation, in step 4), the method further includes: installing sound absorbing material inside the motor housing.

[0017] In a possible implementation, the shock absorbing seat described in step 4) includes a spring group disposed inside the motor housing and a connecting ring disposed on both sides of the connecting shell, and the spring group is connected to the connecting ring.

[0018] In a possible implementation, the motor housing and the connecting housing described in step 5) are both provided with mounting openings on the side surfaces on the same side, and the housing hatch cover and the connecting housing hatch cover are respectively fixed to the two mounting openings.

[0019] In a possible implementation, the longitudinal distance between the fan blades and the motor housing in step 5) is at least 4 mm.

[0020] In a possible implementation, the heat sink assembly described in step 6) is composed of a plurality of aluminum sheets, and the aluminum sheets are fixed obliquely to the outside of the connecting shell and do not contact the motor housing.

[0021] In a second aspect, the present application provides a motor for reducing low-frequency vibration, which is obtained by processing the above-mentioned motor for reducing low-frequency vibration and the processing method thereof.

[0022] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0023] 1. By performing high-speed dynamic balancing on the main shaft and armature core, and using an electronic tension controller to accurately control the tension of the enameled wire in the armature core, the rotor can be kept balanced inside the motor, thereby reducing the low-frequency vibration caused by rotor imbalance;

[0024] 2. By placing the rotor inside a shell with through holes, the airflow generated by the rotation of the rotor moves the spectrum of the airflow noise to high frequency or ultra-high frequency when passing through the through holes on the shell, which significantly reduces the audible sound components in the spectrum. The remaining noise is then converted into heat energy and dissipated through the pore friction of the porous material, further weakening the sound waves.

[0025] 3. The connecting shell is buffered and damped by the damping seat to reduce the noise generated by the vibration of the connecting shell driven by the rotor. At the same time, the damping seat is placed inside the motor housing, so it will not affect the installation effect of the motor;

[0026] 4. The heat dissipation of the connecting shell is carried out through the heat sink group. At the same time, the rotor will drive the fan blades to generate airflow during the rotation process. When the airflow passes through the motor casing and the heat dissipation port, it will take away part of the heat, thereby improving the heat dissipation effect. At the same time, the application increases the longitudinal spacing between the fan blades and the motor casing to at least 4 mm, thereby reducing wind shear noise, and then reducing the high-frequency noise generated by the wind shear noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 This is a schematic diagram of rotor winding balance;

[0030] Figure 3 It is a schematic diagram of the right side structure of the shock absorber seat.

[0031] Explanation of the numbers in the figure: 1. Main shaft; 2. Coil; 3. Commutator; 4. Armature core; 5. Main magnetic pole; 6. Brush; 7. Through hole; 8. Shell; 9. Connecting shell; 10. Porous material; 11. Shock absorber seat; 12. Fan blade; 13. Bearing; 14. Heat sink group; 15. Electronic tension controller; 16. Sound-absorbing material; 17. Enameled wire; 18. Rotor; 19. Spring group; 20. Connecting ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the examples in the present application, all other examples obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] It should be understood by those skilled in the art that the technical terms or scientific terms used in the claims and the specification should be the ordinary meanings understood by persons with ordinary skills in the technical field to which the present application belongs. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect; "and / or" describes the association relationship of associated objects, indicating that three relationships may exist; the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the above terms cannot be understood as limiting the present invention.

[0034] like Figure 1-3 To solve the above problems, an embodiment of the present invention provides a method for processing a motor for reducing low-frequency vibration, comprising the following steps:

[0035] The spindle 1 is subjected to high-speed dynamic balancing, and the diameter of the spindle 1 is within the range of 1 mm to 2 mm;

[0036] After the armature core 4 is fixed on the main shaft 1, the main shaft 1 with the armature core 4 is subjected to high-speed dynamic balancing at 5000 revolutions, and then the coil 2 and the commutator 3 are respectively installed on the armature core 4 and the main shaft 1, so that the installed coil 2 and the commutator 3 are balanced with the main shaft 1, and then the installed main shaft 1 can also be balanced in the connecting shell 9;

[0037] The coil 2 uses two electronic tension controllers 15 to perform winding operations on the main shaft 1. The two electronic tension controllers 15 are placed on both sides of the main shaft 1. At the same time, the same force is applied to pull the enameled wire 17 to form the coil 2. In this way, the tension of the two enameled wires 17 wound to form the coil is accurately controlled to ensure the balance of the rotor 18 after winding, thereby reducing the low-frequency vibration caused by the imbalance of the rotor 18.

[0038] Specifically, the present application performs pre-processing on the thickened spindle 1, wherein the processing methods of turning and grinding ensure better concentricity of the spindle 1 after processing, reduce eccentricity, and reduce vibration caused by concentricity eccentricity; the present application performs a high-speed dynamic balancing test on the spindle 1 after the iron core is pressed, because low-speed dynamic balancing is performed before, and imbalance will be caused by increased centrifugal force after the speed is increased, so a high-speed dynamic balancing test is required to ensure the overall balance of the spindle 1 after the iron core is pressed, and reduce the vibration noise of the rotor 18 caused by imbalance; the present application performs a high-speed dynamic balancing test on the enameled wire 17 The tension is precisely controlled. If the tensions of the two enameled wires 17 are inconsistent, the weights of the two sets of coils of the rotor 18 will be inconsistent. At this time, weighting or deweighting is required for balancing. However, due to the uneven distribution of the coils and the weighting or deweighting distribution (it cannot be the same reverse point), it will be balanced at the balanced speed. However, when it deviates from the balanced speed, the change in the centrifugal force of the unbalanced weight will cause imbalance and vibration noise. Therefore, the better the tension consistency of the two sets of enameled wires 17, the less vibration noise caused by the imbalance of the rotor 18 will be.

[0039] The main magnetic pole 5 and the brush 6 are fixed in a shell 8 provided with a through hole 7, and a porous material 10 is installed on the inner wall of the connecting shell 9. The porous material 10 is evenly arranged on the entire inner wall of the connecting shell 9 to form a resistive muffler inside the connecting shell 9. Then, the shell is fixed inside the connecting shell 9 so that the porous material 10 in the connecting shell 9 surrounds the shell 8 provided with the through hole 7 to ensure the muffler effect;

[0040] The housing 8 is a non-metallic cylinder, the through holes 7 are evenly arranged on the cylinder, the armature core 4 is located inside the main magnetic pole 5, and the brush 6 is in contact with the commutator 3 for generating magnetism through power to rotate the rotor 18.

[0041] At least two heat dissipation openings are provided on the outside of the motor housing, and the two heat dissipation openings are symmetrically arranged. A shock absorbing seat 11 and a sound absorbing material 16 are installed inside the motor housing. Then, a connecting shell 9 is installed inside the motor housing and connected to the shock absorbing seat 11.

[0042] The shock absorbing seat 11 includes a spring group 19 arranged inside the motor housing and a connecting ring 20 arranged on both sides of the connecting shell 9. The spring group 19 is connected to the connecting ring 20. The spring group 19 is made of rubber springs or air springs, and the connecting ring 20 is made of soft materials such as rubber to further improve the shock absorption effect. Metal materials with holes can also be used to improve the heat dissipation effect.

[0043] The main shaft 1 is installed inside the connecting shell 9 through the bearing 13, wherein the side surfaces on the same side of the motor housing and the connecting shell 9 are provided with installation openings, and the housing hatch and the connecting shell hatch are fixed to the two installation openings respectively, and the bearings 13 are arranged on the connecting shell hatch and the side opposite to the connecting shell hatch. When installing, one end of the main shaft 1 first enters the interior of the connecting shell 9 and is connected to the bearing 13 on the side, and then the housing hatch and the connecting shell hatch are fixed back to the motor housing and the connecting shell 9, so that the other end of the main shaft 1 is connected to the bearing 13 on the connecting shell 9, and the housing hatch and the side opposite to the housing hatch are provided with through openings, and the main shaft 1 is located inside the through opening and does not contact the motor housing.

[0044] Install the fan blade 12 on the main shaft 1 located outside the motor housing, ensuring that the longitudinal spacing between the fan blade 12 and the motor housing is at least 4 mm. The diameter of the fan blade 12 can be selected according to the installation requirements. If the volume requirement of the motor is not high during installation, a fan blade 12 with a diameter greater than the diameter of the motor housing can be used, so that the airflow range generated by the fan blade 12 is larger and the heat dissipation effect is better.

[0045] One end of the heat sink group 14 is passed through the heat dissipation port and fixed on the connecting shell 9. The heat sink group 14 is composed of a plurality of aluminum sheets, which are fixed obliquely on the outside of the connecting shell 9 and do not contact the motor housing. The length of the heat sink group 14 can be selected according to the installation requirements. If the volume of the motor is not required during installation, the heat sink group 14 whose other end can be located outside the motor housing after installation can be used, so that the contact range of the airflow generated by the fan blades 12 is larger and the heat dissipation effect is better.

[0046] To sum up, when the motor of the present application is in use, the frequency spectrum of the airflow noise shifts to high frequency or ultra-high frequency when the airflow generated by the rotation of the rotor 18 passes through the through hole 7 on the shell 8, so that the audible sound components in the spectrum are significantly reduced, and the remaining noise is converted into heat energy and dissipated through the pore friction of the porous material 10, thereby further weakening the sound waves. The weakened sound waves and the noise generated by the vibration of the connecting shell 9 driven by the rotor 18 are absorbed by the sound-absorbing material 16. At the same time, in the above process, the rotor 18 reduces the low-frequency vibration caused by imbalance by maintaining balance inside the motor, and the connecting shell 9 is buffered and damped by the shock-absorbing seat 11, thereby reducing the noise generated by the vibration of the connecting shell 9 driven by the rotor 18.

[0047] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for processing a motor to reduce low-frequency vibration, characterized in that: 1) Perform high-speed dynamic balancing at 5000 revolutions on a spindle (1) that is thickened by at least 1 mm and at most 2 mm; 2) After the armature core (4) is fixed on the main shaft (1), a high-speed dynamic balance is performed at 5000 revolutions, and then the coil (2) and the commutator (3) are respectively installed on the armature core (4) and the main shaft (1), and are kept balanced with the main shaft (1); 3) fixing the main magnetic pole (5) and the brush (6) in a housing (8) provided with through holes (7), installing a porous material (10) on the inner wall of the connecting housing (9), and then fixing the housing (8) inside the connecting housing (9) so that the armature core (4) is located inside the main magnetic pole (5) and the brush (6) is in contact with the commutator (3); 4) a heat dissipation port is opened on the outside of the motor housing, a shock absorbing seat (11) is installed inside the motor housing, and then a connecting shell (9) is installed inside the motor housing and connected to the shock absorbing seat (11); 5) The main shaft (1) is installed inside the connecting shell (9) through the bearing (13), and the fan blade (12) is installed on the main shaft (1) located outside the motor housing; 6) Fixing the heat sink assembly (14) on the connecting shell (9) through the heat dissipation opening.

2. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The coil (2) described in step 2) is wound using an electronic tension controller (15).

3. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The porous material (10) described in step 3) is evenly arranged on the entire inner wall of the connecting shell (9) and surrounds the shell (8) provided with the through holes (7).

4. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The shell (8) described in step 3) is a non-metallic cylinder, and the through holes (7) are evenly distributed on the cylinder.

5. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: In step 4), the method further comprises: installing a sound absorbing material (16) inside the motor housing.

6. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The shock-absorbing seat (11) described in step 4) comprises a spring group (19) arranged inside the motor housing and a connecting ring (20) arranged on both sides of the connecting shell (9), and the spring group (19) is connected to the connecting ring (20).

7. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The motor housing and the connecting housing (9) described in step 5) are both provided with mounting openings on the side surfaces on the same side, and the housing hatch cover and the connecting housing hatch cover are respectively fixed to the two mounting openings.

8. The method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The longitudinal distance between the fan blade (12) and the motor housing described in step 5) is at least 4 mm.

9. A method for processing a motor for reducing low-frequency vibration according to claim 1, characterized in that: The heat sink group (14) described in step 6) is composed of a plurality of aluminum sheets, which are fixed obliquely on the outside of the connecting shell (9) and do not contact the motor housing.

10. A motor for reducing low-frequency vibration, characterized in that: The motor is obtained by processing according to any one of claims 1 to 9 for reducing low-frequency vibration.

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