Abstract
With the development of semiconductor technique, and the TMS320LF2407 DSP controller, the accurate asynchronous motor model and all kinds of advanced theories that have resulted in the development of a highly reliable drive with highly accurate and variable speed controls. Vector Control System (VC) is one of the advanced theories, which is based on motor unification principle, energy conversion and vector coordinate transformation theory, It has many advantages such as novelty, practicability and advancement, By transforming the model of AC motor to DC motor, the stator current is decomposed into two DC parts which are orientated towards the rotor magnetic field and controlled respectively. Thus the magnetic flux and torque are decoupled. In which way, it controls the asynchronous motor in a synchronous way. This thesis introduces the correlative information of variable frequency speed regulating, vector control system of asynchronous motor, and expatiate Space Vector Pulse Width Modulation (SVPWM). The principle of SVPWM is in - depth discussed, and the algorithm for SVPWM is ratiocinated. By using MATLAB / SIMULINK dynamic simulation software, through the principle of the vector control system, get the structure model of variable frequency speed regulating system of asynchronous motor based on SVPWM, given all the detailed subschema and plan all the data, using the algorithm for SVPWM, the simulated model of variable frequency speed regulating system fed by SVPWM inverter is set up for asynchronous machine. Through the simulated model, get the result and analyzed it in detail. On the side of software, the module software is written by assembly language and C code so that can be amended and replanted easily.
Key Words : Vector Control ；Variable Frequency Speed Regulating; MATLAB / SIMULINK; Space Vector Pulse Width Modulation
