What causes the noise of four wheeled electric vehicles?

Here's why:

First of all, the electric car needs a large current to start, if the electric car uses a square wave.

The controller, its specific working mode is destined to be noisy, and the noise is more obvious when starting to drive, which is a normal phenomenon; And if a sine wave is used.

Controller, not much noise at the start. In this case, it is recommended to replace the square wave controller with the sine wave controller.

Secondly, if the electric vehicle has a motor hall failure, it will also cause the electric vehicle to start with a relatively loud noise. Because most electric vehicles use brushless motors.

Hall replaces carbon brushes.

The motor position information is fed back to the controller for adjustment. Hall is a group of three, one is broken, there is a malfunction, and the electric car also causes a sound when it starts. For this case, check the hall and replace the damaged hall.

In addition, if the motor has a water ingress failure, it will also cause the electric vehicle to start with a relatively loud noise. Because of the ingress of water into the motor, it will cause internal rust and demagnetization, which will also directly cause the stator and rotor.

Poor operation increases the resistance, and eventually causes the electric vehicle to start with noise. In this case, you can turn on the motor, remove the rust, and if it is more serious, choose to replace the motor with a new one.

Of course, it is also possible that the motor cable on the controller side is loose, if the motor line is loose, it will cause unstable power supply, causing the electric vehicle to start shaking and making noise. For this case, tighten the motor wire.

In short, if the electric car starts with a small noise, it is normal, and if the noise is large, it is necessary to check whether the electric car has a problem.

In fact, there are several reasons for the noise: generally four-wheeled electric vehicles are divided into brushed motors and brushless motors, generally brushed motors are more expensive and less noisy, while brushless motors are noisy and cheap, you see whether you have brushed or brushless motors.

The other is noisy, you look at whether the rear axle of your four-wheeled electric vehicle is loose or worn, and the rear axle is not aligned with the wheel hub, so it causes a lot of noise.

The brushed ones are cheap, the brushless ones are expensive. It just happened to be reversed.

The motor of the electric vehicle is noisy and faulty.

The main reason. 1. Large bearing clearance in the motor: motor bearing, also known as motor bearing or motor bearing, is a special bearing specially used in motor or motor.

The motor bearing bearing is a part that supports the shaft, it can guide the rotation of the shaft, and it can also withstand the idling of the shaft.

2. Motor rotor sweep: it is also a rotating part in the motor. The motor is composed of two parts, the rotor and the stator, which is used to realize the conversion of electrical energy and mechanical energy and mechanical energy and electrical energy. Motor rotors are divided into motor rotors and generator rotors.

3. The magnet is loose and falls off. Magnets are made of several hard and strong metals, such as iron, aluminum, nickel, cobalt, etc., and sometimes copper, niobium, and tantalum, which are used to make super-hard permanent magnet alloys.

4. Axial channeling inside the motor.

5. The surface of the commutator of the brush motor is oxidized, ablated, oily, uneven, and the commutator is loose.

6. The carbon brush holder is loose and the carbon brush holder is not correct.

The motor of the electric vehicle is noisy and faulty.

Solution. 1. Replace the bearing.

2. Repair the stator and rotor again.

3. Re-bond the magnet.

4. Increase a suitable washer axially.

5. Clean the surface layer of the commutator or weld the commutator solidly.

6. Adjust the charcoal brush holder.

High-speed motor why.

Is it noisier than a low-speed motor?

A: At present, there are three main types of motors used in electric vehicles:

1. Brushed high-speed motor. The motor has high efficiency, strong overload climbing ability, large starting torque, and outputs power after deceleration through the variable speed gear device, and there is noise.

2. Brushless low-speed motor. No reduction gear device, with the advantages of maintenance-free and noise-free. However, the controller is complex, the starting current is large, and the overload climbing ability is poor.

3. Brushed low-speed motor. There is no reducer gear device, simple structure, low cost, poor overload capacity and large power consumption.

Because the brushed high-speed motor has a high speed (3000 rpm for the high-speed motor and 500 rpm for the low-speed motor), it needs to output large torque power after deceleration through the reduction gear device, so its noise is relatively louder than that of the low-speed motor. The production process of high-speed motors is more complex and cost-effective than low-speed motors, and high-speed motors are mostly used for some brand-name electric vehicles.

Miscellaneous cars, low-grade cars, assembly cars, in order to reduce costs, choose low-speed motors, when you buy electric vehicles, do not dazzle users because of the slightly louder motor sound users should pay more attention when buying a car, do not because the motor is noiseless, no wear and tear, the main indicators of the motor are motor efficiency and power, the biggest weakness of low-speed motors is low motor efficiency, magnets are easy to demagnetize, heavy weight, poor power, weak riding, high power consumption, etc.

At present, the brands of electric vehicles are particularly mixed, most of the brands come from small and medium-sized enterprises, if you want to buy electric vehicles, please consult carefully, buy carefully.

Check the specific cause of the noisy motor of the electric tricycle, whether it is a lack of oil, a problem with the bearings, or a problem with the motor installation.

Noise will occur during the use of the motor, some can be avoided, and some cannot be avoided. Shandong Yinan Mengfu Electric Tricycle Factory Electric Tricycle** tells you that when the electric vehicle motor is faulty, you can troubleshoot it by self-inspection first. Troubleshooting.

During the rotation of the brushed motor, there will be a humming sound when the carbon brush commutator contacts the friction. The brushless motor will vibrate slightly when commuting at low speed, such as when the vibration frequency is close to the frequency of the car body and other parts, there will be resonance, and the humming sound is endless. If the motor is noisy or abnormal in use, it should be overhauled, and the reasons are often manifested as follows:

If the inner bearing of the electric wheel is loose or the gap between the bearing and the bearing seat is too large, the bearing should be replaced. The bearing seat is loose, the punch impact bearing seat should be applied, and the bearing can be reinstalled. The rotor of the motor should be swept and the stator or rotor should be retrimmed.

If the magnet is loose and falls off, the magnet should be rebonded. The motor is axially channeled and should be repaired. If the surface of the commutator is ablated or the commutator piece is loose, the commutator table should be cleaned or the commutator should be welded.

The commutator surface of the brushed motor is uneven or the commutator is loose. The commutator should be cut or tightened. The carbon brush holder is loose and should be tightened.

1..If the bearing of the electric vehicle motor fails, the clearance will become larger, the motor will not function properly, and abnormal noise will be generated. For this problem, the general solution is to replace the new bearing, which can solve the problem of abnormal noise of the electric vehicle motor.

If the magnet inside the electric vehicle motor is loose and falls off, the performance of the motor will deteriorate, and the motor will make noise when it is running. For this problem, the general solution is to re-bond the magnet, which can solve the problem of abnormal noise of electric vehicle motors.

2.If the motor of an electric vehicle has axial movement, then the motor will shake and make noise when it is running. For this problem, the general solution is to add an appropriate amount of washer in the axial direction, which can solve the problem of abnormal motor noise to a certain extent.

If the rotor and stator of the motor are not concentrified, the local gap will become smaller, resulting in friction, resulting in chamber cleaning and abnormal noise of the motor. In this case, the general solution is to readjust the rotor and stator to solve the problem.

3.Motor bearing, also known as motor bearing or motor bearing, is a special bearing specially applied to motor or motor. The motor bearing is the part that supports the shaft.

It can guide the rotation of the shaft and can also carry the idling parts on the shaft. The concept of bearings is broad. It is also a rotating part in a motor.

The motor consists of a rotor and a stator. It is a device that converts electrical energy into mechanical energy and converts mechanical energy into electrical energy. Motor rotors are divided into motor rotors and generator rotors.

The magnet is loose and falls off. Magnets are composed of several hard and strong metals, such as iron, aluminum, nickel, and cobalt, and sometimes copper, niobium, and tantalum, and are used to make super-hard permanent magnet alloys. When the three wheels are running, the motor parts make a "click" and "click" sound regularly, and it can be basically judged that there is a problem with the motor bearing.

4.Due to the increase in the gap between the bearings of electric vehicles, the phenomenon of bead biting occurs. In general, in this case, it is better to replace the bearing with a new one.

But one thing to keep in mind is that when installing the motor bearing, add some butter to ensure that the bearing is more lubricated and durable! For example, although there is no regularity in the sound, it can be concluded that it is not the sound emitted by the bearing, but the sound emitted from inside the motor. At this time, it can be preliminarily concluded that the problem lies in the magnetic steel sheet, which is likely to be caused by the magnetic steel falling off.

Summary. Hello, this situation is caused by damage to the rear axle, and if the rear axle gear clearance is too large, the faster it runs, the louder it will be. You can try to see if the sound changes when refueling and resuming, there is an obvious change, try it after replacing the gear oil on the rear axle, if it still doesn't work, you have to remove the rear axle and check the internal bearing and gear wear.

Replace the damaged gear and readjust the bearing clearance. There is a time limit for the first reply, if you have any questions, you can reply and answer them in detail.

Hello, don't click to end, I'm textual to give you the full answer, 2-3 minutes.

Hello, this situation is caused by damage to the rear axle, and if the rear axle gear clearance is too large, there will be a pre-combustion situation of jujube burning faster and louder. You can try to see if the sound changes when refueling and resuming, there is an obvious change, try it after replacing the gear oil on the rear axle, or if it doesn't work, you have to remove the rear axle of the stool and check the wear of the internal bearings and gears. Replace the damaged gear and readjust the bearing clearance.

There is a time limit for the first reply, if you have any regrets, you can reply to answer in detail.

I'm talking about the rear axle oil, a pure electric car, the rear axle is also equipped with gear oil, which needs to be replaced once a year, and if it is not replaced for a long time, the internal gears will be damaged. This fault occurred due to the lead omen.

Oh, it's been less than half a year since I bought it, and the noise is not very loud at first, but it will be very noisy as soon as you walk to the cement road.

This situation is still in the warranty period, just find after-sales service for you to solve it, you don't need to spend money to repair, the fault is caused by problems on the rear axle.

Oh ok, thanks.

Okay, you're welcome, I wish you good health and success in your work.

Ask about custom messages].

The sound of the motor in the electric car is loud, and the following reasons need to be investigated: Hello, dear. 1. The bearing clearance inside the motor is large; 2. There is a problem with the rotor inside the motor; 3. The magnet inside the motor is loose or falls off; 4. The axial movement inside the motor is not in the position where it should be; 5. The surface of the commutator is oxidized, loose or uneven.

If the above problems are detected, there are solutions, replace the bearings regularly, repair and maintain the stator or rotor; Replace the magnet sheet with a new one; Add a suitable gasket or residual gasket to the internal rotating shaft; Regularly maintain dust and disturb the commutator. It can be seen that if there is a problem with the motor in the electric vehicle, it can be checked in the following two ways. If the no-load power of the generator is greater than a certain value, it means that the motor in the electric vehicle is faulty, and you can determine the reason for the loud sound in the motor by troubleshooting the above five problems.

If the motor is caused by excessive internal current, it causes the motor to heat up. You can try to cool down the motor, if not, consider replacing the motor.

Summary. Hello dear, the electric four-wheeler chirps while driving. Generally, it is a problem with brake pads or bearings.

First, check the brake pads first, if the brake pads are worn more severely, it will lead to this situation and need to replace the brake pads in time. The second is that the bearing of the vehicle is damaged, which will also lead to this phenomenon, and the wheel bearing needs to be checked, and if there is a problem, it needs to be replaced with a new one. Third, see if the handbrake is not loosened in place caused by the vehicle in the state of braking, if the handbrake does not return, you need to sit in the position of the handbrake adjustment mechanism to lubricate.

Dear, I wish you a happy life, if you have any questions, you can continue to consult, I will answer for you as soon as possible.

Hello dear, the electric four-wheeler chirps while driving. Generally, it is a problem with brake pads or bearings. First, check the brake pads first, if the brake pads are worn more severely, it will lead to this situation and need to replace the brake pads in time.

The second is that the bearing of the vehicle is damaged, which will also lead to this phenomenon, and it is necessary to check the wheel axle bearing, and if there is a problem, it needs to be replaced with a new one. Third, see if the handbrake is not loosened in place caused by the vehicle in the state of braking, if the handbrake does not return, you need to sit in the position of the handbrake adjustment mechanism to lubricate. Dear, I wish you a happy life, if you have any questions, you can continue to consult, I will answer the search for you in the first trillion time.

Hello dear, the electric four-wheeler chirps while driving. Generally, it is a problem with brake pads or bearings. First, check the brake pads first, if the brake pads are worn more severely, it will lead to this situation and need to replace the brake pads in time.

The second is that the bearing of the vehicle is damaged, which will also lead to this phenomenon, and it is necessary to check the wheel axle bearing, and if there is a problem, it needs to be replaced with a new one. Third, see if the handbrake is not loosened in place caused by the vehicle in the state of braking, if the handbrake does not return, you need to sit in the position of the handbrake adjustment mechanism to lubricate. Dear, I wish you a happy life, if you have any questions, you can continue to consult, I will answer the search for you in the first trillion time.