Study And Design On Asynchronous Motor's Fuzzy Control System Based On DSP

The technological and material bases for the high-speed development of AC technique have been provided by the development of control theory and application, as well as the invention of novelty electro-devices with the improvement of capacity and reliability of MCU. The development of economy and society needs provide the impetus to AC technique. Due to the limitations of DC motor in various aspects, in contrary, AC motor is better than AC motor in the structure, cost, maintenance, adapt to the environment, so the AC motor technique will gradually replacing DC technique along with the development of AC technique. Based on the mathematical model of induction motor is analyzed, the fuzzy-PI vector control system has been designed, include the hardware circuit and software and computer simulation.In this paper, after equivalent transformation of coordinates so that the stators torque component and the excitation component is decoupled, based on the mathematical model of asynchronous motor, and then establish the space vector control system based on rotor flux oriented. Fuzzy-PI controller has been designed for the system speed loop and current loop control.Induction motor control system hardware design is simplified, by the improvement of microprocessor's power and reliability, the progress of electrics devices. Induction motor control systems is designed, based on TI company's TMS320LF2407 as the main control chip, Mitsubishi's PM25RSB120 IPM as the inverters module and other hardware devices. This system also includes the electricity power braking protection, and speed detection, current detection, etc.Software is the soul of control system, and the software is directly related to the performance of the system. Through the analysis of the impact after dead zone being inserted, using the software compensate time to minimize the adverse impact. DSP-C language program designed to achieve induction motor fuzzy PI control system design requirements.The computer simulation technology development and popularization partly replace engineering practice. The speed control system can be simulated in the computer to guide the engineering practice by simulation results debugging. Build simulation model of motor control system with the simulation software MATLAB/ SIMULINK. The result of simulation verified that the design of control system scheme is feasible.