Speed Sensorless Vector Control System Design And Implement For Induction Motor

Along with the rapid development of power electronics technology, computer technology and automatic control technology, the electric transmission technology is being faced with a history revolution, it has become development trend that AC transferring speed replaces direct current speed and computer digital control technology replaces the simulating control technology. Frequency conversion is generally acknowledged by the home and abroad that it has a great future with excellent speed, extensive scope of application and other many merits.At first this paper has discussed the advantage and the disadvantage of the AC transferring speed and direct current speed, the development of electric electronic device, the research status of the vector control technology and the characteristic and the application of the DSP chip. The purpose and the main content of the project are given in this dissertation. Then using DSP, which is special for motor control, a speed sensorless vector control system for induction motor is developed which is based on vector control principle. According to the fundamental equations induction motor for the field oriented control, the improved rotor flux estimation model and the adaptive speed estimation model are built respectively. At the same time, this paper uses the Space Vector Pulse Width Modulation method to control the induction motor.This paper introduces the main circuit of the inverter, the main function of the DSP, the detect circuit of the current and the drive circuit in detail. The paper gives the software chart of the system. Making use of the DSP with high-speed capability, the fully digital vector control for induction motor is implemented, and some experiment results are given. The results show that the speed sensorless vector control system for induction motor based on DSP has better dynamic and static performance.