Why do BEVs make noise at slow speeds?

The vast majority of pure electric vehicles, when driving at very low speeds, will have a peculiar "woo-woo" sound. This sound is completely inaudible in the car, only outside the car, and in the front position. What's even more amazing is that as soon as the speed goes up, the sound disappears instantly.

Some people think that this may be the motor sound of a pure electric car, but in fact, this sound is artificial, and the sound is not emitted by the motor, but by a special horn. This sound is called a low-speed tone. The low-speed prompt sound is currently the national standard in the pure electric vehicle industry, and almost all pure electric vehicles must emit such a prompt sound when driving at low speed.

But there are exceptions, and most of the early EVs, or strictly speaking, those that were on the road before 2018, did not have this sound. Because of the low-speed prompt tone, it was only mandatory in 2018. Nowadays on the road, you can still see a lot of older Teslas that are completely silent, and most of those cars are produced in 2016-2017 and do not have a low-speed prompt sound.

Pure electric vehicles.

The buzzing sound is caused by electromagnetic noise, the motor of the car is composed of a rotor and a stator, the wire of the motor rotor and stator is vibrated by the force, which will make a buzzing sound, and the overall force of the rotor vibrates along the axial direction, which will also cause a buzzing sound. The higher the current, the stronger the humming sound, so pure electric vehicles will make a buzzing sound when starting or accelerating sharply.

Hope it helps, hopefully!!

Due to the design and construction of pure electric vehicles, it is generally relatively quiet during driving, although some pure electric vehicles will hear some driving sounds during driving, which may be the simulated sound of the car, which is designed to make the driver feel more driving.

No matter what kind of car? As long as there is an engine in the process of idling, it will definitely write a sound, because the engine will produce sound when it is working, and not only the engine reaction, it may also be the belt, or the sound of the air conditioning compressor, so this is normal without worrying.

When driving at low speeds, the sound emitted by pure electric vehicles is to warn pedestrians and surrounding non-motorized vehicles to pay attention to avoidance.

This is the sound of an electric motor driving a vehicle.

We all know that there is a big difference between BAI pure electric vehicles and fuel vehicles, one of the differences is that pure electric DAO vehicles are very quiet because they have no engine + transmission parts. Unless some models add a sound effect that simulates a fuel vehicle to the vehicle in order to increase driving pleasure, under normal circumstances, pure electric vehicles can basically be made without sound. So, why do some pure electric vehicles sometimes make a buzzing sound when driving?

The buzzing sound emitted by pure electric vehicles is diverse, if the buzzing sound is not harsh, and the sound volume is small, then it is generally caused by electromagnetic noise, and this electromagnetic noise is a normal phenomenon. The motor of a pure electric vehicle is generally composed of a rotor and a stator, and the wires of the motor rotor and stator will make a buzzing sound when they are vibrated by force, which is similar to the buzzing sound heard under the high-voltage line.

In addition, the vibration of the entire rotor along the axial direction can also cause a humming sound. And if the current of the vehicle is larger, this hum will also be stronger, so the hum of pure electric vehicles is the loudest when starting or when accelerating sharply.

Finally, if there are other abnormal buzzing sounds, we still need to be vigilant, and we need to go to the maintenance and inspection in time.

Why do pure electric vehicles hum when driving?

We all know that there is a big difference between pure electric vehicles and gasoline vehicles when driving. One of the differences is that battery electric vehicles are very quiet because they don't have engine transmission components. In order to improve the pleasure of driving, some models can basically do no sound in pure electric vehicles under normal circumstances, unless the vehicle is equipped with a sound that simulates the fuel vehicle.

So why do some battery electric cars sometimes buzz when driving? The buzz of battery electric vehicles** is varied. The humming sound is not harsh, and the low volume is generally caused by electromagnetic noise, which is a normal phenomenon.

The motor of a pure electric vehicle is generally composed of a rotor and a stator, and the wires of the motor rotor and stator will hum when they vibrate. It's pretty much the same as the hum of a high-voltage wire.

In addition, if the full force of the rotor vibrates along the shaft, a humming sound is generated. And the higher the current of the vehicle, the stronger this hum will be, so the hum is loudest when BEVs are started or when accelerating rapidly. Even if there is other buzz, it is necessary to arouse our vigilance, and even more so, to accept the repair inspection in time.

Secondly, for the noise generated by decoration and other parts, the auxiliary noise reduction device can be used to internalize the vehicle, followed by the noise generated by the power gun, and the same as the tires, the motor is complex noise. Its main component is mechanical noise, which is vibration and noise caused by unbalanced inertial forces.

Therefore, for these sounds, it will be processed according to the placement of the motor. For example, if the motor is installed in the front engine compartment, the engine can be isolated or components such as vibration plates can be added to suppress the noise generated. Finally, for electric vehicles, pay attention to the noise coming from **, and replace the sound insulation treatment or some parts corresponding to the noise generated.

Electric vehicles generate electromagnetic noise, and there is also the vibration of the rotor, so it makes a humming sound.

This is due to the fact that the current is relatively large, or because the speed is relatively fast, which affects the engine, and it will also make a humming sound.

This may be due to the poor contact of the engine during the driving of the electric vehicle, which is why such abnormal noises occur.

It means that there is a very big fault in the engine of the car, so there will be such a sound, and you should go to a professional repair shop for repair immediately.

There may be several reasons for this:

1. The clutch sounds;

2. The transmission shaft supports the bearing;

3. Abnormal sound of drive axle;

4. Abnormal noise of the differential;

5. Abnormal tire noise;

6. A certain part of the vehicle loosens the vehicle resonance.

It depends on what the sound and the sound ** can be judged, it is recommended to go to 4S or a repair shop to check.

When an electric vehicle increases its speed, it makes a knocking sound that may be a loose motor line.

Loosening of the motor cable on the controller side will also cause noise when starting. When the motor line is loose, it will cause unstable power supply, causing the electric vehicle to start shaking, resulting in noise.

The failure of the motor hall is also a reason for the relatively loud starting noise of electric vehicles. Because most electric vehicles use brushless motors, Hall replaces carbon brushes, and feeds back the motor position information to the controller for adjustment. Hall is generally a group of three, and when one of them fails, the electric car will make noise when it starts.

When encountering this kind of problem, it is necessary to replace the damaged Hall in time.

Summary. There is this kind of sound when the electric car decelerates, this is a normal phenomenon, no matter which model it is, it is like this, because in the process of deceleration, its battery does not drive the motor to rotate, but in the process of deceleration, his wheel will drive the motor to rotate. So in the case of this reversal, it is said to be driven by a reverse force.

It will make this slight sound, this is a normal phenomenon, and you can use it without any problems, and it doesn't matter.

There is this kind of sound when the electric car decelerates, this is a normal phenomenon, no matter which model it is, it is like this, because in the process of deceleration, its battery does not drive the motor to rotate, but in the process of deceleration, his wheel will drive the motor to rotate. So in the case of this reversal, it is said that in the case of the reverse force and the drive. It will make this slight sound of the branch nucleus.,This is a normal phenomenon.,There's no problem with using the tie key.,There's nothing to do with it.。

The sound is relatively loud, and it has been congregated until it stops, and it will disappear after a while. I didn't pay attention to it before, whether it was caused by the high temperature of the weather now.

This is normal and there is nothing wrong with this. You can use it with confidence.

Summary. Dear, hello, there are generally three reasons why there is a sound in the start of electric vehicles: loose motor connection wire or loose screw hole, broken connection line leads to unstable start-up and loud noise.

Solution: Disassemble the motor connector to see if the line is firmly connected and whether there is any disconnection. If it is caused by the damage to the motor Hall, then the universal control matching degree of the electric vehicle damaged by the Hall will not be too good, or the signal transmission is not smooth at the beginning, which will cause the motor to start loudly.

Solution: Replace Hall directly. Or water ingress into the motor, causing demagnetization or rust inside the motor, poor operation of the stator and rotor, resulting in increased power consumption, and loud noise when starting.

Solution: Disassemble and clean up rust and water. What's wrong with an electric car starting loudly?

1.Motor coil problem: During the use of electric vehicles, too much pulling will cause high temperature to burn Hall, and the motor coil will change color at high temperature, resulting in loud starting sound and power consumption.

Solution: It can be solved by replacing the motor and Hall. 2.

Controller mismatch: The controller should be between 100 and 300 and not more than 300 watts. If there are too many, it will cause the startup sound to be loud and the power consumption to increase.

It is best to match the number of watt motors with the number of watt controllers.

Hello, my BYD electric car. What's going on with a burping sound at a half-hill start.

Dear, hello, there are generally three reasons why there is a sound in the start of electric vehicles: loose motor connection wire or loose screw hole, broken connection line leads to unstable start-up and loud noise. Workaround:

Disassemble the motor connector to see if the line is firmly connected and whether there is any disconnection. If it is caused by the motor leakage and Hall damage, then the universal control matching degree of the electric vehicle damaged by Hall will not be too good, or the signal transmission will not be smooth at the beginning, which will cause the motor to start loudly. Workaround:

Swap out Hall directly. Or water ingress into the motor, causing demagnetization or rust inside the motor, poor operation of the stator and rotor, resulting in increased power consumption, and loud noise when starting. Workaround:

and scavenge, disassemble, and clean up rust and water. What's wrong with an electric car starting loudly? 1.

Electric burner coil problem: During the use of electric vehicles, too much pulling will cause high temperature to burn Hall, and the motor coil will change color at high temperature, resulting in loud starting sound and power consumption. Workaround:

It can be solved by replacing the motor and Hall. 2.Controller mismatch:

It is best to match the controller between 100 and 300, not more than 300 watts. If there are too many, it will cause the startup sound to be loud and the power consumption to increase. It is best to match the number of watt motors with the number of watt controllers.

There are also a lot of times when it is the sound of current, because the motor is a bit troublesome to start, and the torque at low speed may not be so great. At this time, the current is larger than that of the limb, so it will make this missing sound. In addition, it may be caused by controller issues, unsatisfactory output waveforms, etc.

Finally, there is the issue of resonance. When driving at low speeds, the car vibrates.

The situation is like this,,, when starting half-hill, ,,, release the brake is not moving, and then lightly press the accelerator and there is a burp, and there is no sound after the start.

There is no such sound under normal road conditions.

Dear, it may be that the brake disc is uneven.

Summary. Hello, the electric car starts with a clear sound, probably because the throttle is twisted too much, you should start slowly and pay attention to driving safety.

Hello, the electric car starts with a clear sound, probably because the throttle is twisted too much, you should start slowly and pay attention to driving safety.

There was a rattling sound when the car started.

Or maybe it's because the motor is malfunctioning. After this happens, the motor should be dismantled for maintenance. If it can't be repaired correctly, the manuscript will need to be replaced. Electric vehicles are a common type of vehicle with a relatively simple structure.

The main components of an electric vehicle include the frame, motor, battery, and controller. The controller is used to control the circuits of the whole vehicle. Without a controller, an electric car cannot run properly.

The controller is usually fixed under the bend back seat. The motor is the power source of the electric buried Hu Feng car, which can drive the electric vehicle forward. The battery is the part of the electric car used to store electrical energy.

Kiss The electric vehicle motor is loud because:1The 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 proper position;

The causes of abnormal noise of the pro-family machine include bearing failure, loose and falling off of the magnet, axial channeling, and rotor sweeping. If the bearing fails, the solution is to replace it with a new one. The magnet loosens and falls off, and the magnet is rebonded.

If there is movement in the axial direction, an appropriate amount of washer can be added in the axial direction. The rotor is swept and the rotor and stator need to be readjusted.