Three-phase AC Induction Motor Speed Sensorless Vector Control Research

In the1970s, the German scholar F.B laschke put forward "asynchronous motor field-oriented control principle", started the vector control theory of the research prelude。 After the1980s Japan scholars put forward vector PWM control strategy, all over the world in an research institutions of vector control technology research.Vector control (SVPWM) and sine pulse width modulation (SPWM) compare, vector controlcan not only improve inverter voltage dc side utilization ratio, but also can get better the dynamic response of the motor performance, reduce the motor torque ripple. The application of vector control theory, from the speed access method can be divided into a speed sensor and speed sensorless vector control two way, no speed sensor is better speed sensor has more extensive application value.This thesis is about of ac motor speed sensorless vector control research. In this thesisi I first introduced the frequency conversion control technology of the development process and vector control application fields in modern industry, expounds the necessity of research on motor control. The second chapter is about asynchronous motor’s mathematical model and coordinate transformation, the principle of vector control and it’s feasibility, the superiority of principle of space vector control (SVPWM) have compared with the sine wave pulse width modulation (SPWM), and explaining space vector algorithm marching. In the third chapter based on asynchronous motor control system structure, and speed、 magnetic field observation and directional principle,next is about the voltage of the stator and rotor decoupling operation, use of PI method build construction speed motor adaptive identification system, and establish ac motor control mathematic model of the system. The fourth chapter development of induction motor based on MATLAB simulation module of vector control system, and finally gives the simulation model of the simulation results.