Simulation Research Of A System Of Asychronous Motor Variable Frequency And Adiustable Speed Based On Matlab/Simulink

Vector-contorl WVF system of asynchomous motor is a high performance speed-control system and has been used in a lot of situations of high precision and high performence.In the base of vector-control,some control methods are developing, for example speed-sensorlesss control and self-adaptation control. This thesis make a study on Vector-contorl WVF system of asynchronous motor. In the course of study, making use of the mathematical model of asynchomous motor in MT axes. Then both open-loop control system and close-loop vector-control system are respectively simulated with simulation block SIMULINK in MATLAB. In the course of open-loop control system, the simulation model of asynchomous motor is obtained and realized in SIMULINK. This simulation model's structure is simple and its static and dynamic performance is good. In the process of close-loop vector-control system, the author designed a model of current delay-loop PWM vector-control WVF system which includes speed and magnetic double close-loops and realized it in SIMULINK. This paper also use non-linear feedback decoupling theory to decouple die vector-control close-loop system into linear decoupling of rotor speed and rotor flux linkage subsystems.The speed regulator and flux linkage regulator of these two linear subsystems can be designed with classical linear theory. The simulation result has proved this two WVF systems has better static and dynamic performances. Some simulation models are also used in other WVF control strategy systems.