Characteristics of transmission for electric motor

As the development of electric vehicle, the power of motor takes more and more important position in the total powertrain. Because the characteristic of motor is totally different from combustion engine, so their requirements to transmission are different too. The development of electric vehicle is limited by traditional transmission which is suitable only for combustion engine. The requirement of vehicle, the different of characteristic between engine and motor, and the characteristic of demanded power of daily driving cycle are analysed in this paper. Compared with engine, the requirements of motor to transmission are less gears, more torque tolerance capacity in input shaft and more efficiency.