New energy vehicles have environmental protection, saving, simple three big advantage. Particularly in pure electric vehicles: replace the fuel oil machine with motor, driven by the motor without automatic transmission. Compared with automatic transmission, motor has simple structure, mature technology, reliable operation. Traditional internal combustion engine can effectively produce torque speed limit in a narrow range, that is why the traditional internal combustion engine automobile gear mechanisms of why it needs the large and complex; And the speed of the motor can be quite broad in scope effectively produce torque, in the process of pure electric vehicles do not need to shift transmission, easy manipulation convenient, low noise. Compared with the hybrid vehicles, pure electric vehicles using a single electric energy, greatly reduces the electric control system of automobile internal mechanical transmission system, simplify the structure, also reduces the mechanical parts caused by friction energy loss and noise, saving the internal space, the car weight. Motor drive control system is the main execution in the new energy automobile traffic structure, drive motor and its control system is the core of the new energy automobile parts (Battery, motor and electric control)One of the driving characteristics decided the main performance index of the car, it is an important part of a electric cars. Electric cars in the fuel cell car FCV, HEV, hybrid vehicles and pure electric vehicle EV three categories are motor to drive the wheel drive, select the appropriate motor is one of the important factors to increase ratio of all kinds of electric vehicle, so r&d or perfect can meet the performance requirements in the process of vehicle, and have strong and durable, low cost and high efficiency of motor driven approach is extremely important. Drive motor system is one of the new energy CheSanDa core components. Motor drive control system is the main execution in the new energy automobile traffic structure, the drive characteristics decided the main performance index of the car, it is an important part of a electric cars. Electric car of the drive system including the motor drive system with mechanical transmission mechanism of two parts. Motor drive system is mainly composed of motor, power converter, controller, all kinds of detection sensor and power components, such as structure are shown in figure 2 below. Motor general requirements with functions of two electric, power generation, can be chosen according to the type of dc, ac, such as brushless permanent magnet or switched reluctance motor, as shown in figure 3. Power converter according to the selected motor type, a DC/DC power converter, DC/AC power converter, such as form, its role is in accordance with the requirements of the selected motor drive current of battery DC converted into corresponding voltage grade of DC, AC and pulse power supply. The rotation of the motor is the basis of the principle of electromagnetic induction to run electromagnetic machinery, used to implement the conversion of the electric energy into mechanical energy. Runtime absorbing electric power from electric system, the output mechanical power to the mechanical system. Motor drive system is mainly composed of motor, controller,Inverter)Structure, drive the ratio of the cost of the motor and its controller is about 1:1, according to the principle of design and the different methods of classification, the special structure of motor and cost differences, too. The control system mainly rise to adjust the running state of machine, make it meet the requirements of vehicle different operation purpose. In view of the different types of motors, principle and way of control system has the very big difference.
