附 录A外文翻译英文资料翻译原文Wheel type electric cars driving system 1. Development situation and overviewWheel type electric car is a kind of driving type electric cars, there are two basic forms, namely direct driving type electric wheels and belt wheel edges reducer electric wheels. It will be installed on the wheel hub of motor is omitted, traditional clutch, the transmission, the main reducer and differential unit etc, simplifies configuration and improve the transmission efficiency, and to realize the electric control technology through the electronic differential control wheels. Electric wheel will become the future development direction of electric cars.The electric car wheel type of the study in Japan. Japans keio university of electric car research group has developed five different forms of vehicles. In 1991, with Tokyo electric power company jointly developed by IZA electric car seat, Cd - battery power method, with four rated power for 6.8 kW, 25kW reached the peak power of the rotor permanent magnet synchronous motor driving wheel speed can reach the highest, 176km/h. In 1996, the Japanese national institute of environmental groups jointly developed electric wheel drive system of rear wheel drive electric cars, the ECO electric wheel drive system chooses permanent brushless dc motor, power rating for 6.8 kW, for 20kW peak power, and planetary gear reducer, the electric wheels adopt mechanical braking and motor is a combination of regenerative braking. In 2001, the group launched by using lithium battery for power supply, eight high power ac synchronous motor driving wheel independent KAZ electric car. The installation of the eight wheels, and greatly increased the power, thereby the highest speed 311 km/h. The electric system KAZ used in high speed, high performance of motor rotor inside, the peak power can reach 55 kW, improve the ability of the limit speed KAZ cars, make its 0 100km/h acceleration time reach 8s. In order to make the motor output speed with the actual requirements, wheel rotation KAZ electric system matching planet gear. Using KAZ front disc brake drum brake using, rear. In 2003, Toyota motor company launched in Tokyo motor show the fuel cell concept car is also used to end an argument - N electric wheel drive technology. General motors corp. In 2001, the new trial wire four wheel drive car fuel cell concept also USES electric wheel drive Autonomy, electric wheel drive system of flexible control and arrangement, the better able to realize control technology.Domestic electric wheel drive mode study also made some progress. Tongji university chunhui series of fuel cell vehicles using the concept of four brushless dc motor driving wheel independent electric wheels module. Byd in 2004 Beijing auto ET concept car also adopted new drive electric car: four wheel drive motor independent pattern edge. Chinese academy of sciences, Beijing three-ring general electric company developed electric car brushless dc motor with wheels, say again electric wheels. A single wheel electric power, voltage 7.5 kW, double rear 264 V direct drive. The Chinese institute of four wheel corporation 724 electric automobile, motor performance index for the power rating: 3 kW, rated speed 3000r/min, rated voltage is 110 V.2. Structure analysisWheel electric drive system have direct driving type electric wheels and belt wheel edges reducer electric wheels are two basic forms. It depends on the rotor speed is using high-speed rotor motor or within. Direct drive a car with the rotor motor, electric wheels and a complete parts assembly wheel, electronic differential mode, motor, decorate in the wheels within wheels drive vehicle driven directly. Its main advantage is the motor, small volume, light quality and low cost, high transmission efficiency, compact structure, vehicle structure layout and design, also facilitate the retrofit design. This electric wheel directly in the installation of the wheel rim driving wheel rotation. But when the electric car in large torque, need is installed in the direct drive motor must type electric wheels can provide large in low torque. In order to make the car can have good performance, motor must also has a wide range of torque and speed adjustment. The work of the impact and vibration and the wheel rims wheels, request must be strong and reliable supporting, at the same time, because of the spring load, to ensure the quality of the comfort of vehicle suspension systems, elastic elements and damping element optimization design, motor output torque and power is limited, the system of wheel size high cost.Belt wheel gear wheel drive electric power while using high-speed rotor motor system in modern high-performance electric cars, suitable for the operation. It KuangYongChe originated from the traditional electric wheels, belongs to the slowdown driven type, the electric motor speed wheels allow in operation, usually the highest speed motor design in 4000-