Optimal Design Method Research For Automatic Control Systems Of Electrical Drives

Electric Drive System is also defined as Electrically Droved System which includes all the mechanism droved by motor. Electric drive system should meet the technical requirement that the start and stop, the speed and location of the mechanism should be under control through a reasonable control to its motor drivers. With the development of the technology and our increasing recognition to the environment protection, Electric Drive System is being widely used in our life. Thus it is very important to develop a better design method for better performance and lower cost.In recent years many new theories and new strategies has been applied in Electric Drive System and bring many good effects. But for much of them, the basic closed loop control structure with regulators is still. It is also why the Engineering Design Method for regulators is widely used. So, optimal design method for regulator is still very important in Electric Drive System's optimization. In this paper a regulator's optimal design method has been developed for traditional I , traditional II, and traditional HI systems. It is based on the principles that makes the maximum value of the closed loop amplitude frequency characteristic become minimum and the regulate time become minimum. This method is also based on the widely used "Engineering Design Method", which takes only a little traditional system as its model, mean while design the loops separately. This paper provides many formulae and schematics about the relations between the parameters and its performance, which is very convenient for a designer to use. To improve the robustness of induction motor vector control system, some research is also done.Using MATLAB to simulate the systems based on the optimal design method provided, the results indicates that the author's optimal design method for traditional I and traditional II systems gets a better performance than the "Engineering Design Method" does. Futher more, the method for traditional III system is never mentioned by the "Engineering Design Method " although it is needed. Using a composite rotor flux observer and double fuzzy PI controller enhanced the robustness of the system while received more preferable speed-control performance.