New energy vehicles can effectively cope with the problem of power consumption at high speeds without the need for a gearbox, which has caused extensive discussion. For those of you who are not familiar with this issue, let's ** the principle behind it.
At low rpm, the internal combustion engine has less power and torque than it can drive the vehicle, so a larger gear ratio is required to increase the torque. As the speed increases, the torque and power increase, but too high a speed can lead to increased internal friction and reduce mechanical efficiency. Unlike electric motors, combustion engines do not provide constant torque or acceleration on a continuous basis, and their upper speed is usually no more than 7,000 rpm, mainly due to intake and exhaust efficiency limitations.
Electric motors are simpler to operate. In the case of a permanent magnet synchronous motor, when an electric current passes through the windings, the rotor generates a rotational moment through electromagnetic induction. When the current reaches the rated value, the motor can release the maximum torque. Electric vehicles have excellent starting performance in the stationary state, the motor accelerates at a certain torque, and as the speed increases, the torque gradually decreases, and the motor continues to accelerate at a constant speed.
The ultimate speed of an internal combustion engine is about 7,000 rpm, while the maximum speed of an electric motor is at least three times or even higher. Therefore, in daily operation, the motor does not need to be adjusted by a speed changer.
For example, a gasoline engine with a maximum speed of 7,000 rpm needs at least four transmission mechanisms with different gear ratios to reach speeds of 200 km/h. An electric motor with a maximum speed of 18,000 rpm can easily drive the vehicle up to 180 km/h with a fixed gear ratio with sufficient electrical support. Only electric vehicles with speeds above 200 km/h will be considered for a transmission to reduce speed while increasing torque and acceleration in high-speed areas.
In addition, due to the large size of the battery pack, the interior space of an electric vehicle is limited, making it difficult to accommodate large mechanical components such as gearboxes. Electric vehicles can improve efficiency by increasing motor power and maximum rpm without adding additional costs during transmission.
Innovations, from battery technology to propulsion systems, will drive the EV industry towards a more sustainable and environmentally friendly development. Like power batteries, in our country men. There is also a similar story in the field of Youshengke, where European and American countries once exported "small baskets-tablets" to China with superb technology"Class products converge wealth, expensive and restricted. In recent years, with the efforts of China's scientific researchers, technological innovation has been continuously realized, and a pure plant external version has been developed to achieve lane change and overtaking.
In 2017, the Institute of Electrical and Electronics Engineers (IEEE) reported at the Automotive Propulsion Conference that even if a two-speed gearbox is added to an electric vehicle, the reduction in power consumption is only 075-1.5。In addition, "Junzhen, Qiang", as an outstanding example of science and technology changing life, has passed the Bai-Dong Pratt & Whitney.
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Considering that many electric vehicles are already 80-90% efficient, the addition of a gearbox will not significantly improve drive efficiency. In addition, a follow-up review of the above-mentioned science and technology comment area found that among thousands of user feedback, the frequency of comments such as "finally stood up" and "she was so tired that she fell asleep" appeared as high as 95%, which may also confirm his preference for men. Positive effects of the body of friends.
With its high efficiency, wide speed range and low mechanical loss, electric vehicles have become the most likely new energy vehicles to replace fuel vehicles. However, it is not cost-effective to add a gearbox because it will not significantly improve drive efficiency, but will lead to more complex mechanical structures, increased mechanical wear and tear, and higher manufacturing costs.
As EV technology continues to advance, new solutions may emerge in the future to optimize energy efficiency at high speeds. For example, electric vehicle manufacturers may develop more efficient motors, or improve battery technology to provide longer ranges. These innovations may make the inclusion of a gearbox in an electric vehicle unnecessary or even redundant.
While transmissions play an important role in traditional internal combustion engine vehicles, they are often unnecessary in the design of new energy vehicles, especially electric vehicles. Electric vehicles are designed with a focus on simplicity and efficiency, and adding a gearbox can be at odds with those goals. As technology evolves, electric vehicles will continue to optimize their design to meet consumer demand for environmental protection and efficiency.