Why does the electric car run very slowly, and it is normal for a while

There are two possibilities.

1. The electric vehicle potentiometer is faulty.

2. Poor contact of electric vehicle power supply line.

The working principle of the potentiometer: set a fixed maximum voltage, and then generate different voltage signals according to different angles, so as to adjust the duty cycle of the controller to drive the motor fast or slow!

A potentiometer is a resistive element with three pin-outs and the resistance value can be adjusted according to a certain change law. A potentiometer usually consists of a resistive body and movable brushes. When the brush moves along the resistor body, a resistance value or voltage is obtained at the output that is related to the amount of displacement.

The potentiometer can be used as both a three-terminal element and a two-terminal element. The latter can be regarded as a variable resistor, and because its role in the circuit is to obtain an output voltage that is related to the input voltage (applied voltage), it is called a potentiometer.

The main role of potentiometer in the circuit is as follows.

1.Used as a voltage divider.

A potentiometer is a continuously adjustable resistor that slides over the resistor body when the handle or slide of the potentiometer is adjusted. At this time, the output voltage of the potentiometer can be obtained at the output end of the potentiometer, which has a certain relationship with the applied voltage of the potentiometer and the angle or stroke of the movable arm.

2.Used as a rheostat.

When a potentiometer is used as a rheostat, it should be connected to two terminals, so that a smooth and continuously varying resistance value can be obtained within the stroke of the potentiometer.

3.Used as a current controller.

When a potentiometer is used as a current controller, one of the selected current outputs must be a sliding contact exit.

If it is due to the second reason, please check whether the power supply circuit of the electric vehicle is in good contact in time.

Some electric cars have a device to maintain speed, and many people are not used to it, just go to the place where the car is repaired and remove that device!

Generally slow at the beginning, help!!

Maybe there's something wrong with the handlebar.

There are generally 4 reasons why electric vehicles cannot run fast when fully charged.

1. The speed limit line has not been lifted.

As we all know, some electric vehicles will be connected to the speed limit line when they leave the factory, and the fastest speed of the vehicle at this time can only run to 25 to 30km h, which is also one of the important reasons why electric vehicles cannot run far when fully charged. For this problem, the user only needs to find the controller speed limit line and disconnect it to remove the speed limit. After the speed limit is lifted, the maximum speed of electric vehicles can also be restored to 30 to 50 km/h.

2. The speed limit is set at the factory for electric vehicles.

In addition, some electric vehicles have been set speed limits when they leave the factory, for example, electric vehicles that can run at a maximum speed of 50km per hour can only run 30km h after being set. The solution to this problem is also very simple, the user only needs to press and hold the brake for 3 to 5 seconds, then screw the speed control knob to the maximum position, then turn on the power and release the brake, and then release the knob, so that the speed can be restored to 50km h.

3. The controller connection line is rusty.

If it is not for the above two problems, then it is possible that the controller connection line is rusty, because after the connection line is rusted, the resistance will increase, and the electric vehicle will also run poorly, or even intermittently insufficient power. So, for this problem, the user only needs to find the corresponding controller, and then remove the rust, and the normal speed can be restored.

4. The motor hall is damaged.

Finally, there is also the possibility of motor Hall failure, because when the motor Hall fails, the electric car will show weakness, that is, insufficient power, at this time, even if the electric car is fully charged, it will not be able to run fast. For this problem, just replace it with a new Hall, and the problem of not running fast can be solved.

Hello dear problem may be one: low battery. We often find that when the battery is about to run out, even if the knob is adjusted to the fastest position, the speed cannot go up, and the driving is intermittent.

Because the electric vehicle controller has under-voltage protection, such as the under-voltage point of the 48V battery is 42V, the under-voltage point of the 60V battery is 53V, and so on. When the power is used to the undervoltage point, the speed of the car will slow down, which is a kind of protection for the battery. This problem is not called a problem, as long as it is fully charged, it can be solved.

Problem 2: Speed limiting device. Since the current standard for electric vehicles is the old national standard in 1999, one of the requirements is that the maximum speed is not more than 20 yards, otherwise it is an over-standard car, can not be licensed, once there is a traffic accident manufacturers to be responsible.

Therefore, many manufacturers install a speed limit line when the new car leaves the factory, and as long as the line is cut, the speed can be increased. Problem 3: Motor demagnetization.

Frequent overweight and overload will weaken the magnetism of the motor and demagnetize the magnet; If the motor demagnetization, which also occurs under strong vibrations or excessive temperatures, all demagnetized motors will have a decrease in power and a slower speed. Problem 4: Handle problem.

If the contact resistance of the plug is too large, it will also cause the motor to rotate slowly and drive hard. Detect the voltage of the speed control signal line (green line) of the speed control handlebar, and when the handle is at the maximum angle, the voltage of the speed regulating terminal should be. If it is less than this voltage, it will cause the electrode speed to slow down, and the speed regulating handle should be replaced.

Problem five: Failure of the third gear shift. Many electric vehicles are installed with a three-speed shift device, which can speed up the commutation frequency through the controller to achieve gear shifting, increase the output current, and increase the motor power.

When the shift switch is put in normal gear, it will be significantly slower than overtaking. Problem 6: The controller is malfunctioning.

The speed of the vehicle is determined by the speed of the motor, which in turn depends on the current of the controller. The current distributed by the controller is different, the larger the output current, the faster the speed, and the mismatch between the controller and the motor power will also lead to a slower speed. Question may be seven:

Insufficient tire pressure. Whether there is enough gas in the tires also has a great impact on the riding of electric vehicles. If the tire gas is insufficient, it will increase the resistance of the electric vehicle to move forward, which will not only consume high power, but also affect the speed of the vehicle.

Problem Eight: Brake failure. If the front brake is not used often, the rust will cause the brake rocker arm to be inflexible and difficult to return to position, accompanied by braking resistance, and slow down; If the brake pads on the rear wheels fall off or if a foreign object enters the brakes, it will also affect the slowdown.

Even if the brakes are not bad, sometimes too tight can rub the wheels and reduce the speed of the car.

Dear, I wish you a happy life, if you feel satisfied, move your little hands to give me a thumbs up

1. The main factors for electric vehicles to run slowly are: battery; Charger; drive motors; Line; Load, etc. 2. Battery, if the battery is old, it will not be full every time it is charged, and the lack of power will of course make the electric vehicle very power-consuming and not fast.

3. Charger, if the charger is aging or internal faulty, the charging voltage is not enough each time or the protection circuit is faulty, and the input voltage will be cut off before it is fully charged, which will make the battery charge insufficient and affect the normal use. 4. Motor, if the motor is old, the carbon brush is seriously worn, the bearing lubrication is not good, etc., it will consume a lot of electrical energy and the input mechanical energy is insufficient. 5. Circuit, if the circuit is aging and outdated, the insulation is not good, or the circuit contact is oxidized, the contact resistance will become larger, and the voltage will not be enough to drive the motor normally, and the electric energy will be wasted.

It should be a brake failure, resulting in holding the wheels, it is recommended to send it for repair!

1.Check whether the battery output of the electric vehicle is normal, if the output is too low, it proves that the battery is bad and the battery needs to be replaced urgently. 2.

Whether the controller is good or bad can be shorted by the positive 5V of the handle line, such as the turn of the handlebar, it means that the controller is fine, and the easiest way is to smell it. 3.Check the handlebar, and use the wire short to connect the positive pole and signal cable (to put it bluntly.

You're too heavy, you're out of load, and the car can't be towed.

My electric car is suddenly running very slow today, it used to be 15 minutes away, today suddenly 30 minutes, that is, the speed of the bicycle, it's useless to be in a hurry, it's very late to get home, there is no car repair on the side of the road, and I will go to work tomorrow, what can I do, pondering my own tinkering, I don't know how to start, or ask the mobile phone, I saw a lot, it was difficult for me to figure it out, and finally I saw this, the second one is very simple, I didn't expect it to work, I tried it, and it was a matter of a few seconds,Sure enough, it was the same as it was.,It's an accident.,It's good to be in a good mood.,Otherwise, it's very troublesome to repair tomorrow.,It's also a waste of time.,It's okay.,Solve my problem.,Thank you very much.,I'll always pay attention to and support you.。

Summary. If the above solutions cannot cancel the speed limit of the new national standard electric vehicle, you can unplug the speed limit line on the electric vehicle controller. The specific steps are as follows:

1. Turn on the seat cushion of the electric vehicle, remove the screws of the seat bucket, and find the controller; 2. When wiring the controller, find the interface with two white thin wires (some models are gray thin wires), and then unplug them; 3. Under normal circumstances, the driving speed of the electric vehicle will be significantly increased after the speed limit line is removed; If you unplug the speed limit line and the speed of the car still does not change, you can find the "three-speed line" on the controller, that is, the interface of the blue, black, and brown wires. By connecting the blue and black lines, the driving speed of electric vehicles will be greatly improved.

Dear, your car key is good Cong Qing, I am very happy to serve you, through the official query shows, the battery car runs slow to solve the solution: 1. Turn off the power of the electric car, turn the accelerator handle three times, and tighten the brake; 2. Turn on the power of the electric vehicle, wait for a few seconds, and release the handle brake after hearing the "dripping" sound of the vehicle; 3. Turn off the power and restart Zheng Qiao, so that the speed limit of the electric vehicle is lifted.

If the above methods cannot lift the speed limit of the electric vehicle, you can also try the following method: 1. Turn on the power of the electric vehicle, pinch the left brake and do not move; 2. Turn on the power, turn the throttle knob to the end, then release, and repeat twice; 3. Release the brakes, turn off the power of the electric vehicle, and then turn it on again, and the speed limit of the electric vehicle will be lifted. Mountain fingers.

If the above solutions cannot cancel the speed limit of the new national standard electric vehicle, you can unplug the speed limit line on the electric vehicle controller. The specific steps are as follows: 1. The seat cushion of the Kailishan electric vehicle, remove the screws of the seat bucket, and find the control of which device; 2. When wiring the controller and the code coder, find the interface of two white thin wires (some models are gray thin wires), and then unplug them; 3. Under normal circumstances, the driving speed of the electric vehicle will be significantly increased after the speed limit line is removed; If you unplug the speed limit line and the speed of the car still does not change, you can find the "three-speed line" on the controller, that is, the interface of the blue, black, and brown wires.

By connecting the blue and black lines, the driving speed of electric vehicles will be greatly improved.

1.This may be due to the motor magnets.

Demagnetization, low battery, or damaged handle. When this happens, it should be fixed immediately. Electric vehicle.

It is a simple means of transportation.

Its main components 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.

It is the power source of the electric motor and can power the electric vehicle. Batteries are the part of the electricity that electric vehicles use to store electricity. The battery can power all the electronics on an electric vehicle.

2.The battery is also a consumable part that needs to be replaced regularly. As the number of charge and discharge increases, the performance of the battery will continue to deteriorate. During the charging and discharging process, the ions in the battery will be in the electrolyte.

Some ions react chemically with the electrolyte as they move in the electrolyte.

As the number of charges and discharges increases, the number of ions in the battery decreases, and so does the performance of the battery. This happens because the controller is damaged, and you should replace it with a new one as soon as this happens. The controller is used to control the circuits of the whole vehicle.

3.Without a controller, an electric car cannot run properly. The controller is usually secured under the rear seat.

The motor is demagnetized and vulcanized, and often overweight and overload will weaken the magnetism of the motor and demagnetize the magnet; If a motor demagnetization is possible under strong vibrations or high temperatures, the power of all demagnetized motors will be basically reduced and the speed may be slowed down. An electric car is a simple means of transportation. Its main components include the frame, motor, battery, and controller.

The lack of air pressure in the tires and the adequacy of the air in the tires also have a great impact on the riding of electric vehicles.

4.If the tires are insufficient, it will increase the drag of the electric vehicle, which will not only consume high power, but also may affect the speed of the vehicle. Of course, if you face objective factors such as headwinds, uphill, overweight, etc.

Speeds may also be slower. When the electric vehicle suddenly slows down, it should be checked immediately at a professional maintenance point. The electric motor is the part of the electric vehicle that is used to provide power, and the electric motor can drive the electric vehicle forward.

Without a battery, an electric car cannot run properly.

It may be that the operating handle is damaged, or the battery is not strong enough**, or the battery is damaged, and there is a problem with the braking system, which may cause a sudden drop in the speed of the battery car, and should be repaired in time when related problems occur.