Do you think it s necessary to have a gearbox for electric cars?

We all know that from manual transmissions to automatic transmissions. The development of transmissions has also undergone a series of changes, and various automatic transmissions of different technologies have also been developed. The gearbox itself has not yet reached the end of its development, and it is still evolving.

Of course, the development of electric vehicles will not stop because of the popularity, let alone disappear like this.

Who said no! The current electric car consumes 8 to 10 kWh of electricity at 40 constant velocity 60 kWh of electricity consumes 10 to 12 kWh of electricity 100 kWh of electricity at constant velocity 20 to 25 kWh of electricity 120 kWh of electricity at constant velocity 40 to 45 kWh Do you say you need it?

I am a pure electric vehicle owner and have been driving a pure electric vehicle for two years. For the vast majority of electric vehicles produced by independent brands that are transformed from fuel vehicles, there is a gearbox, but this gearbox is in name only, only a fixed transmission ratio, to be precise, it is more appropriate to call a single-stage reducer. Because there is only one gear, the speed of a pure electric vehicle is always proportional to the speed of the electric motor, and the faster the speed, the higher the speed.

In the case of my Emgrand EV, the cruising speed of 100 km/h is as high as 6,700 rpm, which is already more than the redline speed of most turbocharged gasoline cars. Contrary to gasoline vehicles, pure electric vehicles are not good at running at high speeds, especially above 100km h, not only the acceleration begins to be weak, but the power consumption also increases.

Electric vehicles are the upgraded version of our commonly used electric bicycles, its power, the principle of control is the same, is stepless speed change, no gear, only forward and backward, ** also use gearbox, Wenxin is also the reason for China's vigorous development of electric vehicles. Directly surpassing my weaknesses, complex engine and transmission parts design, manufacturing.

It is not a gearbox in the traditional sense, in fact, the principle is a transmission gear, that is, a reduction gear! You can think of it as a modern gearbox.

If electric vehicles are to adapt to a wider range of road conditions and achieve more performance expected of ordinary and special vehicles, they will definitely need the blessing of a gearbox. Without a gearbox, the electric motor and electronic control system are prone to overheating at high speeds or high torque outputs, which not only greatly reduces performance, but also causes great damage to the power system itself. In actual use, it is withdrawn as continuous high-speed driving overheating, climbing, weak traction and overheating, etc.

But the gearbox of the electric vehicle does not need a lot of gears, as long as it meets the needs of the actual situation, and the transfer device does not need to be too complicated, ordinary clutch or electronic transfer case, the current technology is very mature, easy to implement.

It has been four years since I came into contact with new energy vehicles, and I initially came into contact with petrol-electric hybrid vehicles, and then to pure electric vehicles, these vehicles have a very strong acceleration ability to drive up when using electricity, and there are many vehicles that break 100 in 5 seconds, as for the transmission of the vehicle, it is also very different. The transmission of traditional fuel vehicles is generally a gear transmission, which is powered by the engine, and the pure electric vehicle does not have an engine, not to mention the fact that the engine provides power, and there will be no gear transmission, the transmission is changed to a motor, relying on electricity to provide power, the greater the power, the faster the speed, much like the automatic transmission vehicle of the CVT transmission, without switching gears, completely relying on the speed and power of the engine to control the speed of the vehicle. Pure electric vehicles provide mainly electricity, the car is driven by a motor, relying on voltage and current to control the speed of the motor, as long as the current and voltage value applied to the drive motor can be changed, the speed of the motor can be changed, and the purpose of controlling the speed of the car can be achieved.

Pure electric trucks use manual transmissions to improve low torque and improve cargo climbing ability. Civilian passenger cars generally do not use gearboxes, only the motor shaft is connected to a fixed gear ratio reducer, and electric supercars have a gearbox.

Now electric vehicles are permanent magnet synchronous AC motors, a few use asynchronous AC motors, use three-phase sinusoidal AC inverters, control speed is frequency conversion mode, therefore, multi-speed gearbox can not play a role in power saving, so, only use single-speed speed reduction gear mechanism.

However, there is a two-speed gearbox that can reduce the speed of the motor, reduce the heating of the motor, reduce the influence of temperature on the permanent magnet, and make the motor work in the best state.

Nowadays, the train loses power at high speeds because of the influence of wind resistance.

I used to be the opposite, but I understood it after repeated raisings by multiple professionals.

Pure electric vehicles do not have a gearboxMost pure electric vehicles only have one reducer, which can reduce the speed and increase the torque, and only in this way can the car run normally.

There is no need to use a gearbox for pure electric vehicles, and the motor speed range of pure electric vehicles is relatively large, and you can directly use the motor to regulate the speed. The speed of pure electric vehicles, and the starting speed depends on the power and performance of the drive motor, the length of its driving range depends on the capacity of the on-board power battery, and the weight of the on-board power battery depends on the choice of power batteries such as lead-acid, zinc-carbon, lithium batteries, etc.

A brief introduction to other situations of pure electric vehicles.

The drive motor of pure electric vehicles is DC brushed, brushless, permanent magnet, electromagnetic, and then AC stepper motor, etc., and their selection is also related to the vehicle configuration, use, and grade.

In addition, the speed control of the drive motor is also divided into stepless speed regulation and stepless speed regulation, and there are electronic speed control controllers and non-speed control controllers. The electric motors include in-wheel motors, internal rotor motors, single motor drives, multi-motor drives and combined motor drives.

Electric cars also have gearboxes.

1. Traditional internal combustion engine vehicles must have a gearbox, and pure electric vehicles will directly have no but not necessarily no gearbox;

2. Although electric vehicles will directly have no gearbox, under normal circumstances, the design of electric vehicles with gearboxes is more reasonable.

The reason why electric vehicles have gearboxes but motors don't need gearboxes: The core of electric vehicles is a DC motor with high power conversion efficiency. The motor is composed of a stator and a rotor, the rotor coil does the cutting magnetic field line movement in the electromagnetic field formed by the stator, the greater the rotor excitation electricity, the greater the torque of the rotor, the faster the rotation speed, the highest will directly reach more than 10,000 revolutions, it will directly meet the needs of the car, the motor uses the transformation excitation to adjust the rotation speed, which is simple and convenient, and is easier than the gearbox with a high cost.

The motor will directly drive the car, eliminating the intermediate stages such as the clutch and gearbox of the car, which can greatly improve the efficiency of energy conversion and reduce a lot of unnecessary intermediate energy consumption.

The reason why the traditional engine needs a gearbox: in the case of a certain throttle, the speed and torque transmitted from the engine are fixed (unlike the motor can automatically change according to external conditions), when the outside resistance is greater than this torque, he will only turn off, so the gearbox is needed to adjust the relationship between torque and speed, such as when I just start, I want a large torque, so hang a gear, here, the engine has to turn a lot of turns, so that the wheels can turn a circle, when the speed reaches a relatively fast (the required torque is less), You can put a higher gear and let the engine turn fewer times to push the wheels around.

Pure electric vehicles do not have a gearbox. When the BYD Qin is driving in pure electric mode, the transmission is not involved in the work.

A device that changes the speed ratio and direction of movement. It is used in automobiles, tractors, ships, machine tools and various machines to change the torque, speed and direction of movement transmitted from the driving shaft to the driven shaft according to different working conditions. A geared gearbox generally consists of a case housing and a number of gear pairs.

In the driving of the car, in order to adapt to different working conditions, the driving force and the speed of the car need to change in a certain range, and the torque and speed change range of the existing engine cannot reach this requirement, so the gearbox is arranged.

Common faults: In the process of long-term use, due to frequent gear shifts, the parts in the gearbox will inevitably be worn and deformed, resulting in the difficulty of gearbox engagement, automatic dismounting, noise during operation and other fault phenomena, which affect the use.

Therefore, in daily use, it is necessary to frequently check the working condition of the gearbox at full load, observe whether the transmission of the gearbox is stable, whether there is abnormal clearance and noise, and find out the reason for adjustment or repair in time.

Whether a pure electric vehicle has a gearbox or not, the gearbox can be said to be one of the most important core components of the car, but unlike the consumers of traditional fuel vehicles, who are more concerned about the engine and gearbox, the consumers of electric vehicles are more concerned about the charging time and mileage of the vehicle. Today, I will tell you whether there is a gearbox for pure electric vehicles.

Whether a BEV needs a gearbox or not – two scenarios.

Yes, but not necessarily. Gearboxes (including single-reduction and multi-gear) and gearless (direct-drive) are both configurations that exist in existing BEVs. Advantages with multi-speed gearbox:

2. Cost advantage under the same performance or performance advantage under the same cost. In order to meet the requirements of climbing, the maximum torque of the motor needs to be made relatively large, and the gearbox scheme has a large speed ratio in the starting gear, and a high-speed and low-torque motor can be selected, which can save the motor cost. Moreover, the high-speed and low-torque motors have a wider distribution of high-efficiency intervals than the low-speed and high-torque motors, which is conducive to the improvement of efficiency under actual working conditions.

Yes, a good motor has a strong speed change ability, a wide range of speed regulation, and the speed control is completed in the motor controller, which is like a hub motor, and does not need a transmission or even a reducer. The development trend of electric vehicles is direct drive, that is, the mechanical transmission device is reduced, and the motor directly drives the wheels, which has the advantage of simpler power control algorithms, better vehicle stability, and lower failure rates.

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Do not participate in ......It can't be counted like this, the poultry is a hybrid ......Some electric vehicles will use two-speed, while others will use single-speed ......Formula E uses a two-speed, and Tesla uses a single-speed.

Tell yourself every day: no matter how difficult it is, you must persevere, no matter how good you are, you must be indifferent, no matter how bad you are, you must be confident, no matter how much you save, and no matter how cold you are, you must be enthusiastic.

Being with the wrong person is like wearing a pair of shoes that don't fit, no matter how beautiful the shoes are, it is you who will hurt yourself in the end.

What does the electric motor need a gearbox for? The efficiency of the motor is independent of the speed, the torque is uniform, and there is no need for a gearbox.

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If you want it, don't just expect it. Life is too short to wait.

Okay, okay, okay, okay, okay.

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What about the Qingming Festival, did you go back to sweep the tomb? Dog lover: No, I'm too busy at work.

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Pure electric vehicles.

There is no gearbox.

Most BEVs only have one reducer.

This reducer can reduce the speed and increase the torque, only in this way can the car be driven in the spring. Pure electric vehicles do not need to use gearboxes, and the speed range of the motor is relatively large, so you can directly use the motor to regulate the speed. The power take-off of a pure electric vehicle is more suitable for stop-and-go urban roads, and this kind of car is also free of exhaust emissions when driving.

Pure electric vehicles refer to vehicles that are powered by on-board power supply and driven by motors to drive the wheels, and meet the requirements of road traffic and safety regulations. The power output of electric vehicles is completely different from that of fuel vehicles, the power of electric vehicles is better than that of power batteries, and the power output comes from permanent magnet synchronous motors using direct current.

It has a strong acceleration explosiveness. Demolition and search is like a 100-meter sprinter.

From start to acceleration, it has a terrifying explosive power, and the revs can usually reach more than 10,000 rpm. As the electric gate is pressed, the greater the current input, the greater the torque that the motor can provide, and the power is very pure by increasing the speed of the vehicle by way of high speed.

In addition, the larger the motor torque of electric vehicles, the faster the speed, and the gearbox is not required, which greatly improves the energy conversion efficiency of electric energy into kinetic energy from the perspective of energy transmission. The elimination of the gearbox saves complex mechanical structures on the one hand, and unnecessary energy consumption on the other. The motor also has a characteristic that when the voltage and current are constant, the higher the speed, the lower the torque, and the highest efficiency of the motor.

Therefore, when the input power is constant, the motor will automatically maintain the highest efficiency to output power.