Research On Induction Motor Vector Control System Based On SM-VSC

In this dissertation, based on the theory of speed-sensorless vector control system, the vector control system using Sliding Mode Variable Structure Control (SM-VSC)is simulated. To realize the designed system, necessary hardware and software are also schemed.Firstly, developing direction ahd progress of control strategies of alternating current motor and speed-sensorless vector control technology in recent years is summarized. The principles of vector control, coordinate conversion and rotor field orientation are expounded; Mathematical models of induction motor in different coordinates are introduced. Moreover,the design and application problems of SM-VSC are introduced including its design goal,method,as well as the problems of invariability and chattering etc.That offer theoretical foundation for further research on the speed-sensorless vector control system for asynchronous motor.Then, the speed-sensorless vector control system based on sliding mode rotate speed observer is discussed. And its state inaccuracy observer, switching function and equivalent speed are deduced in detail. Based on these ,the simulations of speed-sensorless vector control system based on SM-VSC is realized in MATLAB/Simulink, and the simulation results are discussed. The results of the simulation show that the speed-sensorless vector control systems for induction motor is effective and rational.Finally, the software and hardware based on TMS320F2810 to realize speed-sensorless vector control system for induction motor are schemed.