What s going on with the electric motor heating up in an electric car?

In the case of continuous high-speed driving of electric vehicle motor, due to high-current discharge, according to the law of conservation of energy, the motor can not fully convert the electric energy into kinetic energy, and some of it is converted into heat energy (current through resistance, resistance heating), which is a normal situation, but if the temperature exceeds 40 degrees, or even more than 60 degrees, it is dangerous, and the motor enameled wire insulation may melt away, causing a short circuit and the motor burns out. If your electric car has not been modified by itself, such as increasing the battery boost to 60V or 72V or 84V, etc., or the controller power increases or fails, the general motor temperature will not exceed 40 degrees. If it is not high-speed driving and the motor is hot, then it is necessary to check what causes the continuous discharge of high current.

One is the power circuit and controller, and the other is the braking system.

Because the electric motor is hot under rapid rotation.

There are three main categories of causes of hot electric vehicle motors: motor internal failure, controller failure and braking system failure.

Clause. 1. Internal fault of the motor. The internal fault of the motor that causes the motor to heat up may be caused by the following reasons:

1. Caused by the bearing, the bearing carries the rolling speed, once the gap between the steel balls increases, it will cause the internal sweep of the motor, the stator rubs the rotor, the heat is laborious, the friction increases, and the temperature rises. Solution: Replace high-quality bearings.

2. Caused by stator deformation. In order to reduce costs, some motor manufacturers have poor stator rigidity and easy deformation, and they will deviate from the normal track when they rotate, and the force will be uneven and the temperature will rise. Workaround:

Replace the stator with good rigidity. 3. Caused by the coil. Pure copper wire winding, not only saves power but does not heat, and has strong power, but the market appears motor copper-clad aluminum, aluminum-clad copper, which will cause the temperature of the motor to rise.

The heating of the motor is also related to the thickness of the motor turn, the internal material of the coil is different, the power, electricity consumption, and the heat will also be different, the thinner the line, the greater the heat. Solution: Replace the pure copper stator.

Clause. Second, the braking system problem. The heating of the friction motor of the electric vehicle braking system may be caused by the following faults:

1. The brake line does not return. Due to long-term use, water and rust at both ends of the brake line or scratching the outer skin of the brake line at the bottom end will make the brake not return, accompanied by the brake, and the motor temperature will rise. 2. The brake pads are worn out.

Some customers have ineffective brakes, tight and tight, tight to the end, resulting in increased friction between the brake and the motor and the increase in motor temperature. 3. The brake spring is broken. It is difficult to make the brake pads pop in place by relying on the external spring, and the brake pads are not "closed", so that the brake brake brake promotes rolling resistance and increases the temperature of the motor.

Clause. 3. Controller issues. The controller regulates the speed of the motor with the help of electrical energy conversion current.

Heating is a normal phenomenon, and both the motor and the controller have a large current passing through during the working process, and the heat must be dissipated through the shell. No heat means that it is not normal, but there is a problem with overheating, the controller controls the current size, and when overloaded riding or the car is riding, it will also increase the temperature of the motor. However, if there is a fault inside the controller, it will also cause the motor to heat up.

In addition, the mismatch between the controller and the motor will also cause heating, the motor small controller will cause damage to the motor, and the power of the control small motor will be insufficient, so it is recommended to use the controller for how big the motor is.

Fever is present. It is a relatively normal phenomenon for electric vehicles to heat up in high-speed riding, but if the temperature is too high, it is not normal, it will cause damage to the motor of the electric vehicle, causing short circuit and loss of magnetism of the motor, which will make the motor scrapped.

Generally, there are two reasons why the electric vehicle motor is excessively hot:

1. Faults inside the motor of electric vehicles.

If there is a problem inside the motor of the electric vehicle itself, it is easy to cause the motor to be hot, the reason is that the bearing is a problem, the bearing of the electric vehicle is carrying the rolling speed, if the steel ball gap in the bearing increases, it will cause the internal stator and rotor of the motor to rub against each other, so that the motor will be hot.

2. Problems with the braking system of electric vehicles.

In addition to the internal problems of the motor, the braking system of the electric vehicle is also an important factor. The problem with the braking system of the electric vehicle is generally that the brake line of the electric vehicle does not come back, resulting in the brake increasing the temperature of the motor, in this case, we have to replace a brake line.

It is a normal phenomenon that the electric vehicle is slightly heated, because when the motor and controller of the electric vehicle are working, there will be a relatively large current passing through, so that the heat will be dissipated so that the electric vehicle will be slightly heated. However, if there is excessive fever, it is necessary to pay attention to the cause of the examination to "prescribe the right medicine".

Fever is present. Because the electric vehicle is the process of converting the electric energy of the battery into kinetic energy during the riding process. In this process, the electric energy is converted through the circuit of the motor to complete the conversion of kinetic energy, which will consume the electric energy and generate heat, and the motor will heat up.

If the electric vehicle encounters strong resistance during driving, you have to rotate the accelerator hard, so that the heat of the motor will increase a lot, and it will also be the phenomenon of motor overheating.

Does the electric car heat up while driving? It is normal for the electric vehicle to generate heat when driving, and the electric energy is converted into kinetic energy, and the motor coil heats up. But the temperature will not be too high, now some electric vehicles, the dashboard has a motor and battery temperature display, according to the electric vehicle riding distance, load, speed, road conditions and other factors, about 30-40 degrees in winter, about 50-60 degrees in summer, the temperature is too high indicates that there may be problems with the motor or bearing.

It is normal for the motor of an electric vehicle to heat up. However, it should be noted that the heating temperature of the motor will not exceed 60-70 degrees Celsius. If the fever is abnormally hot, you should go to the after-sales service to test it.

1. There is a problem with the bearing.

The bearing of the electric vehicle is carrying the rolling speed, if the steel ball gap in the bearing increases, it will cause the internal stator and rotor of the motor to rub against each other, which will make the motor hot. In this case, we still have to replace the bearing with better quality in time.

2. There is a problem with the coil.

If you use pure copper wire, it will not be so easy to heat, and the power of electric vehicles will be very strong, but now there are also coils with copper on the outside and aluminum on the inside, which will make the temperature of the motor easily rise. For this case, we still have to choose to replace the coil with pure copper.

If the heat cannot be dissipated in time and accumulates inside the motor, the internal temperature of the motor will become higher and higher. In the long run, there will be problems such as reduced efficiency, coil burning, Hall failure, etc.

Moreover, it will form a vicious circle of easy to heat up, efficiency decreases, heat is more likely to heat up, and efficiency decreases again. Therefore, to ensure that the motor can run stably for a long time, controlling the internal temperature is the key.

1. Internal fault of the motor.

The heating of the motor is related to the turn of the motor, and the internal material of the coil is different, resulting in the difference in motor power and heat, and the thinner the turn, the greater the heat. The pure copper stator can be replaced to reduce the motor temperature.

The bearing supports the rolling, as long as the ball clearance increases, the stator rubs the rotor, it will work hard to generate heat, the friction increases, and the temperature also increases. High-quality bearings can be replaced to avoid problems.

2. Controller failure.

If you don't do it too much, the controller will generally heat up, but overheating will cause concern. The controller adjusts the speed of the motor with the help of electric energy conversion current, and the temperature of the motor will increase when the large current is discharged. Therefore, it is recommended that the size of the controller should match the motor.

3. Failure of braking system.

After the brake spring is broken, it is difficult to make the brake pads pop in place by relying on the external spring, and the brake pads are not "closed", which makes the brake brake have rolling resistance, resulting in an increase in the temperature of the motor.

Bearings:The bearing carries the rolling speed, once the gap between the steel balls increases, it will cause the internal sweep of the motor, the stator rubs the rotor, the heat is laborious, the friction increases, and the temperature rises. Solution: Replace high-quality bearings.

Caused by stator deformation:In order to reduce costs, some motor manufacturers have poor stator rigidity and easy deformation, and they will deviate from the normal track when they rotate, and the force will be uneven and the temperature will rise. Solution: Replace the stator with good rigidity.

Features of electric vehicle motors.

It is necessary to pay attention to the work of the motor, in fact, it uses the magnetic effect of the current, the current can generate a magnetic field, and the south pole and the north pole of the magnetic field will repel each other to produce thrust, and the appropriate commutation pole (there are mechanical and electronic methods) can form a continuous rotation state.

The generator works by using the electromagnetic induction effect, that is, if there is a conductor in the changing magnetic field (magnetic flux change), an electromotive force will be generated at both ends of the conductor, and once a closed loop is formed at the two ends with electromotive force, an electric current will be generated, and this process is power generation.

The mobile phone will be hot after a long time, and it will be hot when you watch the TV, and it is normal for the motor to be hot! The car engine has been driven for a long time, and it can burn people, especially in summer

The motor will be 15-25 degrees warmer than the ambient temperature.

If you can put your hand on it, it will be normal.

As long as the motor power and the controller power match, there is no problem, and it is normal to be hot.

The fever is normal, as long as the other parameters are normal.

Do not exceed normal temperature.

20 degrees.

Summary. Pro-<>

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In the case of continuous high-speed driving of electric vehicle motor, due to high-current discharge, according to the law of conservation of energy, the motor can not fully convert the electric energy into kinetic energy, and some of it is converted into heat energy (current through resistance, resistance heating), which is a normal situation, but if the temperature exceeds 40 degrees, or even more than 60 degrees, it is dangerous, and the motor enameled wire insulation may melt away, causing a short circuit and the motor burns out.

Is it normal for the motor to heat up after the use of an electric vehicle? Is it normal for electric car motors to be hot.

Hello dear<> <>

Glad to serve you<>

In the case of continuous high-speed driving of electric vehicle motor, due to high-current discharge, according to the law of conservation of energy, the motor can not all convert electrical energy into kinetic energy, and some of it is converted into heat energy (current through resistance, resistance heating), which is a normal situation, then change the state condition, but if the temperature exceeds 40 degrees, or even 60 degrees to annihilate the circle, it is dangerous, and the motor enameled wire insulation may melt off, causing a short circuit and the motor burns out.

Dear, if your electric car has not been modified by itself, such as increasing the battery boost to 60V or 72V, 84V, etc., or the controller power increases or fails, the general motor temperature will not exceed 40 degrees. If the land potato is driving at high speed and the motor is hot, then it is necessary to check what causes the continuous discharge of the high current. One is the power supply circuit and controller, and the other is the braking system.

In the process of motor repair and maintenance, the causes of motor heating are summarized, and I hope to bring some guidance to the majority of motor users.

Clause. First, the main reason for the heating of the motor is that the working time is too long, which is like the human body working for a long time, there will be fatigue, the motor is also the same in a long time, the high-intensity use of the motor, it will cause the body of the motor to heat and hot, and seriously will lead to the phenomenon that the motor can not work normally.

Clause. Second, the cooling fan does not work normally during the use of the motor, and in this case, the motor heats up, so in this case, the maintenance personnel of the motor are required to clean the cooling fan of the motor to make the fan work normally, which can reduce the frequency of motor heating.

The performance of the motor is not good, the power conversion efficiency is low, and a lot of electric energy is lost in the form of thermal energy. The possible problems of the motor are: the low height of the motor magnet, the low magnetic flux of the magnetic steel grade, and the small amount of copper of the motor lead to the small regenerative electromotive force and the large current, and because the diameter of the motor copper coil is small, the copper loss is large, and the heat energy is generated.

In short, this is the result of the manufacturer's consideration of cost-saving materials. Of course, the above premise is that you have not increased the current limit of the controller without authorization, and the premise is to rule out the short circuit phenomenon of the motor coil winding.

Normally, the motor is hot for a period of time in the summer! As long as it doesn't exceed 100 degrees, it's no problem! Check if there is a problem with the brake, check whether the motor bearing is broken, and check whether the output current of the controller is too large!

Whether the distance is too far or whether it is overloaded, the above reasons will cause the motor to heat up!