Research An AC Speed Control System Based On Sliding Mode Variable Structure

In 21st century, electric cars are clean and effective city transport. It combines light, electricity, various disciplines of the latest technologies, are vehicles, electric traction, power electronics, intelligent control, chemical, power, computers, new energy, new mate-rials, such as the latest achievements of engineering and technology in an integrated prod-uct. As a clean, energy-efficient new means of transport, electric vehicles have a unique advantage. AC asynchronous motor with its unique simple structure , durable, stable and reliable operation, a small moment of inertia, manufacture low-cost, low maintenance and convenient, be able to apply harsh environment and many other advantages, has been widely applied to industrial and agricultural production. AC motor in the field of electric vehicles also have broad application prospects.First of all, through a series of assumptions and coordinate transformation, induction motors have been relatively simple numerical models, which can communicate speed con-trol system has been similar to the linear model of the figure. Because of the self-induction motor parameters (rotor resistance, stator resistance) and the load parameters (moment of inertia, etc.) due to environmental conditions change, and this approximate linear model of the figure can not be accurate transient response of speed control system process makes the general law of the linear regulator has a speed control system must communicate limita-tions. Experimental structures have been, on the basis of sliding mode variable structure theory of the design and implementation of the regulator speed control system can guaran-tee the robustness and speed to meet system performance requirements.Secondly, the combination of induction motor working principle as well as the func-tion of the system needs to TMS320LF2407A DSP core to control the use of sliding mode variable structure control technology, take full advantage of TMS320CLF2407A DSP on-chip resources as well as its ability to deal with highly efficient, eliminating the past, the design of complex hardware circuits, play "hardware to soften" the effect of simplifying the system's hardware structure.