Permanent magnet motor vehicle drive motor is the center of the electric car power system key parts, the stand or fall of its functions directly affect the vehicle's vehicle function. After more than ten years development, our country in motor drive motor technology, products, industry has gained great improve. Our country has developed for meet the needs of all kinds of electric cars series motor drive system products, has won a large number of related intellectual property rights of drive motor system, formed the batch production ability. China's independent development of permanent magnet synchronous motor, ac asynchronous motor and switched reluctance motor has been completed with the domestic automobile enterprise form a complete set of medium and small batch, product under scale covering 200 kw of power vehicle power demand, power drive motor system's primary function index reached the same level of international advanced level, some products have been out of the country. , together with the given priority to with the United States, Europe and Japan the supply of new energy cars drive system of the enterprise to develop rapidly, the decline in motor production capital, improve the motor power and motor and engine integrated planning and have gained great progress, such as industry chain gradually improve, constantly improve the supporting ability, also make the future of China's drive motor to face many challenges. 1. Improve the permanent magnet motor power density in order to make electric cars more miniaturization and has larger output power, after years of practice in the world, from the perspective of improving power density and torque density, selection of rare earth permanent magnet as motor magnetic materials is the inevitable choice. As the electric car in, the market need that chose rare earth permanent magnet motor high function. Because now most of the rare earths are produced in our country, and reserves is the world's first, therefore our country in the aspect of automobile permanent magnet motor has significant resources. Because in recent years, China has the rare earth element as a strategic resource, and has carried on the strict export restrictions, this led directly to Japan of rare earth permanent magnet motor material concerns, 'the next generation of cars strategy 2010' in Japan, has put forward development instead of rare earth permanent magnet motor technology of raw materials. The United States in the new generation of power electronic technology plans are also seeking alternatives of rare earth permanent magnet technology plan, but didn't find good method now. 2. Expand the regenerative braking efficiency area and fuel engine car gearbox transmission to extend the engine operating range similar to that of electric drive system is also after continuous introduction of variable structure to complete the operation range of motor control, make it possible for both power higher regional cooperation work better. Regenerative braking is a fundamental of hybrid mechanical and electrical integration technology. With the improvement of mixing degree, corresponding, regenerative braking demand scale will be bigger and bigger. Choose to give back to the motor, the appropriate variable speed system and the control strategy, can make the promised scale used more working condition of the regenerative braking, which make the whole car energy saving more and more useful, extended trip away. 3. Process of mechatronics integration drive motor system is necessary to meet the requirement of integration of powertrain, and support the vehicle serialization of products and production scale. Toyota car company THSII drive system and improve and develop the Honda IMA system of fully embodies this point. THSII has expanded to a variety of models, including Lexus and IMA is equipped to contain a variety of models of Civic and accord. Vehicle drive motor system integrated primary embodied in motor and motor, motor and gearbox, motor and brake system of mechatronics integration enhances unceasingly. Hybrid engine and drive motor integration of integration from the structure to control integration, and system integration. As the car power electrification share more and more high, the depth of different coupling electromechanical coupling of powertrain system makes the motor and the gearbox contact is becoming more and more closely. In high functional electric car category, will be the new development of chassis system, braking system, gear train, makes the motor and power transmission device integration. Electromechanical integration is not only the integration of technology, but also the integration of mechanical and electronic structure. The development of mechatronics integration process and motor gearbox production enterprise cooperation, on the basis of original traditional gearbox compatible machine interface, even planning special electromechanical transmission, the ability of the organic combination of both. 4. Increase the degree of integration and digital control system for electric drive control system integration degree is also increasing, the motor control device (DC / AC), low voltage DC/DC converter, two-way high-voltage DC/DC converter and so on carries on the different ways of integration is becoming a development trend. High speed, high functional microprocessor makes electric control system into the digital age. Digital control chip with high function, high speed, on the basis of high functional control algorithm, chaotic control theory to complete, the function of the motor and its control system was improved greatly. Together, user-oriented visual programming, through the code and download directly into a microprocessor, constantly improve the power of programming and debugging can be. 5. Electric drive system of industrial cluster in the domestic technology on samples to research and develop the and get a break with the motor system is moving towards industrialization variety, small batch mass production, in this stage need special processing variety, small batch of flexible production technology and engineering problems. The picture above shows the drive motor system, capital and market demand, the relationship between mass production in accordance with the 90 -95% of the decline in single set of capital, and thus to batch production capacity and quality system certification. In the future, will present domestic independent suppliers new car electric drive system, traditional support electric cars and car industry, car with a new type of industrial electrical automation are gradually formed.
