After more than a year, NIO ET7 is finally about to start delivery in China on March 28. Because it is built by the NIO NT 2.0 platform, NIO ET7 is talked about in terms of intelligent assisted driving, lidar, and semi-solid-state batteries.
Perhaps because Weilai has always emphasized its own high performance, the improvement in power has made everyone accustomed to the basic element of the electric drive system, a new energy vehicle. In addition to those improvements that are easy to quantify, Weilai ET7 is actually equipped with a new second-generation electric drive system, compared with the first generation of electric drive system, there have been some improvements in key indicators, so is Weilai's second-generation electric drive system really powerful?
Electric drive system, if analogous to fuel vehicles is equivalent to the existence of "three major pieces", so car companies prefer to hold the lifeblood in their hands, rather than relying on suppliers, which is also the original intention of Wei from the research of electric drive systems. However, this electric drive system also has its own shortcomings, and like the Weilai ES8, it was called "a semi-finished product for catching ducks on the shelves" by a car critic.
Weilai and Tesla use the same AC asynchronous induction motor, but from the data point of view, the maximum power of the first generation of Weilai motor is 240kW, the rated power is 60kW, although the rated power is larger than Tesla, but the maximum power is much lower than Tesla, so the gap between the two can be seen.
The advantage of this motor is that the structure is simple, the manufacturing cost is low, and the disadvantage is that the efficiency of the motor is not high at low speed, and the power consumption is large. The Weilai ES8 has also been questioned because some people have reported that the power consumption of 100 kilometers is 30-40 degrees. Coupled with the slow response speed of the first-generation motor, there are also some shortcomings in the driving experience, such as bringing a great sense of vertigo to the driver during acceleration.
The second generation of electric drive systems has made progress in terms of power performance, efficiency, and NVH. For example, the output power of the motor has been increased from 160kW/240kW in the first generation to 180kW/300kW. Equipped with the second-generation electric drive system, the NIO ET7 has a maximum power of 480 kW and a peak torque of 850 N·m, and can achieve a speed of 3.9 seconds. This is achieved without much change in the size and weight of the motor from before.
The second is efficiency, compared with the performance of the improvement, the second generation of electric drive system in the efficiency of the improvement significance is greater, the maximum current capacity under the same volume increased by more than 30%, for the vehicle endurance of the increase in the amplitude also reached 4% -6%. Finally, in the NVH area, NIO has redesigned the air gap of permanent magnet motors, which is said to effectively reduce noise and vibration. For consumers, these advantages and characteristics are visible to the naked eye, which can intuitively improve the user's experience of using new energy vehicles.
Write at the end
This is the highlight of Weilai's second-generation electric drive system, for example, more emotional than these is the self-research ability of car companies in core technologies. After all, in the era of fuel vehicles, it is backward in terms of engine and gearbox, and now if you want to overtake in curves, you obviously can't rely only on purchasing from parts giants such as Bosch and BorgWarner. I believe that only with real technology can we have a place in the market. Whether Weilai's second-generation electric drive platform can be as powerful as theoretically can be verified immediately.