The highly integrated motor, reducer and traditional drive axle cancel the transmission shaft and differential. Because it adopts electronic differential transmission, the transmission efficiency is high; and the space occupied is small, and the power battery layout is more convenient; but The unsprung mass is large, which is not good for the handling of the vehicle, and the electronic differential control is difficult. For example, the type of AVE130 wheel drive axle produced by ZF AG of Germany, the motor type is asynchronous motor, applied to 10 m ~ 18 m passenger car, the maximum power is 2 × 125 kW, the maximum axle load mass is 13000 kg, its The controller inverter is not integrated on the axle, with a two-stage reduction mechanism
The hub motor part is highly integrated with the drive axle part, and the drive motor directly drives the wheel is the future development direction. This kind of drive system has the highest transmission efficiency, and has the advantages of light weight and low energy consumption; the braking energy recovery efficiency is close to 100%, but the cost is high. When the size of the motor is large, there are problems such as overheating, demagnetization, and industrial chain system. At present, the technology in this area is immature.