The high-speed motor used in electric vehicles is regulated by electronic control system. Fixed gear ratio gearbox can change speed through different gear ratios.
This structural disadvantage makes the electric vehicle start with high energy consumption, high motor speed and single speed regulation function of the gearbox. When driving at high speed, the speed of the motor cannot be reduced by the overspeed transmission ratio less than one through the gearbox, and the speed of the single-stage gearbox is not high.
The single-speed gearbox with fixed transmission ratio for pure electric vehicles is characterized by much lower failure rate, but large gear gap and motor start and stop. You will feel the impact of the gear. Non-compliance .
Extended data
Advantages: low cost, simple structure, convenient installation, low failure rate, low power consumption and small size.
The disadvantage is that there is no room for improvement after the speed of electric vehicles reaches the limit, so the speed is limited and the high-speed economy is not high. Under the condition of the same power, the speed of electric vehicle with asynchronous motor is faster, but after matching with fixed transmission ratio gearbox, the speed has not improved. Even Tesla, which has strong acceleration, has poor acceleration performance in the middle and late stage, which is affected by the fixed transmission ratio gearbox.
Pure electric vehicle is equipped with two-speed transmission, which has low power consumption and strong acceleration performance, but it is also very difficult to develop. The ideal multi-ratio gearbox for electric vehicles must have the characteristics of small size, light weight and high transmission efficiency.