The Research And Simulation Of Asynchronous Motor's Vector Control System

For the DC adjusting-speed system has many limitations, the AC adjusting-speed system has many merits and with the development of new power electronic component and computer technology, the technology of AC Asynchronous Motor variable-frequency adjusting-speed has been in fast development. The speed of computer is continually increasing and its execute-instruction speed had been on a very high level. With today's microcomputer technology's swift development, it makes it possible that the real-time system of complex arithmetic could run in a computer. The adjusting-speed ability of AC asynchronous Motor had been already better than DC adjusting-speed system in the past several years.There are several technique of asynchronous motor variable-frequency adjusting-speed at present, such as constant voltage divide frequency control, vector control, direct torque control, etc. In this thesis, we will discuss the Space Vector Pulse-Width Modulation control system for asynchronous motor. Contrast with direct torque control system, it has many merits such as continuum control: the range of adjusting-speed is wide.The thesis has given detailed analysis on the AC Asynchronous Motor "s mathematics model establishment. Across the analysis of AC Asynchronous Motor's dynamic electromagnetism, it has listed the asynchronous motor's mathematics model and the equation expression on different coordinate. And it has indicated that the asynchronous motor's mathematics model is a multi-variable, strong coupling, nonlinear system.It has exoatiated on the theory of vector control, at the same time, it has give out the process of how to realize the vector control and how to uncoupling the mathematics model. After given out the theory of direct a magnetic field, the paper designs a rotor flux observation, which is by Luenberger's theory.The error of flux observation in an asynchronous motor's vector control system would be serious infection to the performance of motor's control, so much as destroy the motor. It is a better way to solve the capability of asynchronous motor's vector control system depends on the motor's parameter.Using the modem control theory, the paper analyses the asynchronous motor transfer function in the rotor reference frame. Utilizing parameters adjust arithmetic of positive and real error transfer function the paper designs a rotor flux adaptive observation. By usingSMUL1NK simulation too] offered by MATLAB software, the thesis given out the simulation result. After analysis of the simulation result, we can found this kind of rotor flux adaptive observation is helpful.