How do you reduce motor noise in a lawn mower?

Electric lawn mower belongs to garden machinery and equipment, and there are many names such as weeding machine, lawn mower, and lawn mower. The new lithium-ion lawn mower is composed of a blade, a motor, a spindle, a handrail, a protective cover and a supporting battery. Because of its simple operation and easy to use, it is deeply loved by the public.

Electric lawn mowers liberate people's hands, reduce the labor intensity of weeding work, shorten the operation time, and improve weeding efficiency, which is the fundamental reason for the popularity of electric lawn mowers.

Electric lawn mower.

Electric lawn mower classification.

Lithium-ion lawn mower.

Low noise: suitable for home use, will not affect nearby neighbors. For the courtyard lawn, the mowing area is large, the mowing time is long, and if the noise is too large, it will cause disturbance and even be complained.

Smooth operation: Equipped with backpack lithium battery, light and convenient, effortless operation, and small vibration amplitude. When the user operates, it is more fluent.

Environmentally friendly: The lithium battery has strong power, stable output, and can be charged once a day. The pruning efficiency is high, which can effectively save time.

Cost-effective: The supporting lithium battery has a long cycle life, which is twice that of ordinary batteries, although the purchase unit price is high, but the cost of use is more cost-effective.

Close-up of a lawn mower bit.

Lead-acid batteries. Lawn mower.

Low noise: Like lithium battery lawn mowers, the noise is less than that of fuel lawn mowers.

Good quality and low price: the unit price is low, value for money, many users feel that they buy lead-acid batteries.

Lawn mowers are cheaper, and as mentioned above, lithium battery lawn mowers are more cost-effective.

Use. It is mainly used for pitch lawn mowing, community greening, municipal road maintenance, landscape greening, orchard weeding, etc. Especially for community greening, people are currently paying great attention to greening and environmental protection, and at the same time, the lawn area is getting larger and larger, and the demand for electric lawn mowers is increasing.

Among electric lawn mowers, lithium battery lawn mowers are more popular because lithium batteries perform better.

Electric lawn mower.

Characteristic. The electric lawn mower is characterized by simple operation, strong cutting ability for lawns that need to be mowed, and is suitable for high-yield grass and large lawns. The lawn is neatly manicured and beautifully shaped.

Replace traditional manpower, save resources and improve efficiency. Conventional manual weeding is inefficient, the lawn area is large, it requires a lot of manpower, and the cost is uncontrollable. Moreover, the effect of manual pruning is uneven, and the overall aesthetics is not guaranteed.

The emergence of electric lawn mower solves these problems, pruning quickly, the effect is unified, and the waste of human resources is avoided.

The noise level of the circular saw cutting machine is exactly the cubic of the sawing speed, and the sawing speed is 50m s. Machining several uniform muffling grooves along the groove direction on the outer edge of the circular saw cutter can also partially reduce noise.

To reduce the motor noise of the lawn mower, generally speaking, the brushless motor is used, which can reduce the noise to a certain extent.

How can I reduce the noise of the lawn mower Is there a falling frame, was it loud before, or has it been loud recently, is it the engine is loud or the cutterhead is loud.

Is there a falling shelf, was it loud before, or has it been loud recently, is it the engine is loud or the cutterhead is loud.

Answer: Use a high-pressure rubber pipe of appropriate diameter to connect the exhaust pipe to the side of the grass head.

Let me ask if the four-stroke gasoline lawn mower is too loud, is there any way to make it quieter?

I think if you want to make it smaller, use a few more layers of sound shields at his exhaust port.

Vibration should first be distinguished whether it is caused by the motor itself, or by poor transmission, or transmitted from the mechanical load end, and then ruled out according to the specific situation. The vibration caused by the motor itself is mostly caused by poor dynamic balance of the rotor, poor bearing, bending of the rotating shaft, or different axes of the end cover, frame and rotor, or the uneven foundation of the motor installation, the installation is not in place, and the fasteners are loose. Vibrations create noise and also create additional loads.

There are the following ways to eliminate vibration and noise:

1. Check whether the fasteners are loose.

2. Check whether the installation is not stable.

3. Whether the mechanical load is coaxial with the motor and adjusted to it.

3. If the motor itself causes vibration, replace the motor.

The most fundamental way to reduce motor noise is to start from the sound source and adopt some conventional noise reduction technologies; For example, mufflers, sound insulation, sound absorption, vibration isolation, etc. are the most effective methods.

1. Reduce exhaust noise. Exhaust noise is the most important noise source of the unit, which is characterized by high noise level, fast exhaust speed, and difficult treatment. The use of a special impedance composite muffler can generally reduce the exhaust noise by 40-60 dB (A).

2. Reduce the noise of axial fans. When reducing the noise of the cooling fan of the generator set, two problems must be considered, one is the allowable pressure loss of the exhaust channel. The second is the required amount of sound reduction. For the above two points, a resistive chip muffler can be used.

3. Sound insulation, sound absorption treatment and vibration isolation of the unit in the computer room.

1) Sound insulation of the computer room. After the exhaust noise of the unit and the noise of the cooling fan are reduced, the main remaining noise source is the electrical and mechanical noise. The method adopted is to remove all the windows except for the necessary observation windows of the inner wall connected to the observation room, all holes and holes should be tightly sealed, and the sound insulation of the brick wall should be more than 40 dB (a).

The doors and windows of the computer room are fireproof and soundproof.

2) Air intake and exhaust. After the sound insulation treatment of the computer room, the ventilation and heat dissipation problem in the computer room should be solved. The air inlet should be set in the same straight line with the motor unit and the exhaust outlet.

The air inlet should be equipped with a resistive chip muffler, because the pressure loss of the air inlet is also within the allowable range, the air volume in the computer room can be naturally balanced, and the ventilation and heat dissipation effect is obvious.

3) Sound absorption treatment. The five walls in the computer room except for the ground can be treated with sound absorption, and the perforated plate resonance sound absorption structure is adopted according to the spectral characteristics of the power unit.

4) The communication of indoor air and the good sound insulation of the machine room will make the air in the room not get convection when the motor unit is shut down, and the high temperature in the room can not be lowered in time.

5) Unit vibration isolation. Before the installation of the motor unit, the vibration isolation treatment should be carried out in strict accordance with the relevant information provided by the manufacturer to avoid the long-distance transmission of structural sound, and the air sound should be continuously radiated during the propagation, so that the noise level at the plant boundary cannot reach the standard. For the existing power units that require treatment due to exceeding the standard, the vibration of the ground near the unit must be measured, and if the vibration sensation is obvious, the power unit must be isolated first.

1. The bearing flange coefficient should be designed according to the national standard, and the material should not be stolen;

2. There can be no bumps in the manufacturing process, and the cleanliness is controlled to ensure the factory quality of low-noise bearings;

3. Choose silent motor bearing grease for grease, such as synergistic grease, etc.;

4. The installation process is correct, the inner ring of the pressure bearing enters the rotor, and the outer ring is loosely fitted;

5. The corrugated gasket is preloaded appropriately;

6. There is no knocking during the installation process.

If you don't consider the air permeability, you can install a sound insulation cover (the soil method is to use a cardboard box and a sponge or something), and consider the air permeability, just install a sound-absorbing sound insulation board or something. It's expensive, though. If you can't bear it, issuing 2 earmuffs is the best option, and 100 yuan earmuffs (the kind that protect all ears) are enough.

Hello, glad to answer for you. Methods to reduce electromagnetic noise 1) The harmonics of the air gap magnetic conductive teeth caused by the groove opening are the main source of electromagnetic noise, so the air gap should be appropriately enlarged to reduce the magnetic density of the air gap and reduce the stator groove opening. For the high-energy motors that have been used, magnetic groove mud can be used to seal the notch with an appropriate thickness, which can reduce both loss and noise.

2) When designing and manufacturing, the iron core should be geometrically symmetrical, eliminate eccentricity, reduce the ovality of the stator and rotor, and the stator yoke should have a certain thickness, so that the radial deformation will not be too large. 3) Choose a groove fit that avoids the generation of radial force waves, and make the frequency of the radial force wave not resonate with the natural frequency of the stator core and the casing. 4) The rotor adopts a chute to eliminate the electromagnetic noise caused by the harmonics of the lower teeth.

2. The method of reducing ventilation noise can be adopted under the condition that the temperature rise is permitted: 1) Appropriately reduce the outer diameter of the fan, and adopt the fan with wing-shaped and centrifugal backward inclined blades. For motors that require only one direction of rotation, an axial fan can be installed.

2) Adopt a reasonable air path. Obstacles in the wind path must be avoided or minimized; When changing the direction of the wind path, the radius should be increased, and the cross-sectional area of the wind path should be gradually changed. The pillars perpendicular to the direction of the wind path should be as streamlined as possible. 3. Methods to reduce mechanical noise 1) Replenish grease in time, replace bearings in time, and use anti-wear bearings and precision bearings.

2) Strengthen the manufacturing process, maintain the balance of the rotor, etc.

4. The muffler muffler is a device that can absorb and shield the sound by allowing the air flow to pass through. When changing the sound source makes it too costly or difficult, a muffler can be used to reduce noise. Mufflers are divided into two categories: absorption mufflers and reactive mufflers according to their working principle.

1) The absorbent muffler air duct is lined with sound-absorbing materials. This muffler easily absorbs high-frequency sound, but it is not easy to absorb low-frequency sound. 2) Reactive mufflers use the reflection and interference of sound to absorb noise.

Hope mine is helpful to you.

The noise of imported products is not necessarily the same, and the noise of air motors comes from two aspects, 1 is the noise of mechanical rotation vibration. 2 is the sound of air flow impact caused by the pressure drop of the exhaust port. The noise of an air motor (e.g. a motorcycle exhaust port) is mainly due to the sound of air currents.

Noise reduction can be achieved by eliminating the impact of airflow. Choosing a muffler with the same exhaust volume depending on the air consumption of the air motor can eliminate most of the noise.

The reason why the TV is very noisy: some components inside the machine are deteriorating and damaged, which is to be repaired as soon as possible Don't think it's just a small problem, if you keep it to develop, it may damage other components.

The first step in detecting a fault is to determine the noise**, which is a very thin and high-pitched sound that is not caused by a faulty audio circuit and the sound from the speakers.

In fact, the root cause of this noise is the sound emitted by high-frequency transformers such as row output transformers or switching power supply transformers in the machine.

TV noise source and treatment: Thin sharp sound and sound emitted by the speaker with a faulty audio circuit, even if the sound is muted or even the horn is broken.

Make the noise disappear from the noise, the root machine internal transmission transformer, or turn off the power transformer and other high-frequency transformers, the original transformer core loosens high-frequency resonance.

The noise value of vane air motor is generally between 70 and 80db, if you want to reduce the noise, I will tell you a few ways, one is to extend the outlet end pipeline, extend it by forty or fifty centimeters, and then install the muffler, the second is to make a better sealing cover, and the third is to buy a better muffler.

Gangong gangong air motor.

The gap between the shaft and the sleeve increases due to wear, causing vibration when the motor rotates at high speed.

Generally, some lubricating oil can be added to alleviate the noise.

Friction A good motor has less friction and is quieter, and it also reduces the loss of work.

If the contact is not good, or there is no lubricating oil, you can try tightening the screws