Electric vehicle motor drive system vibration source mainly from motor powertrain internal self-motivation and road excitation two aspects, including the basic theory of the electric vehicle motor mounting system, calculation methods and design process. The main knowledge are:
   ① required to achieve maximum speed while cruising on the highway 4-5 times the basic rate, while industrial motors only need to reach constant power is the basic rate of two times can be.
   ② electric vehicle drive motor requires work controllability, high steady-state accuracy, good dynamic performance; and industrial motors only a particular kind of performance requirements.
   ③ need to get used models and designed according to the driver's driving, but only according to typical industrial motors operating mode.
   ④ is mounted on a motor vehicle, a small space to work at high temperatures, bad weather, and the frequent vibration, etc. harsh environments.
   Load requirements for electric vehicle motor is very strict, requiring motor after loading test, the motor drive system is stable, basically meet vehicle performance, because the main difference between electric vehicles and conventional vehicles is the motor instead of the traditional power source engine.