The Research On Speed Sensorless Induction Motor Torque By Fuzzy Control

With the high speed development of power electronics and computer technology, AC electricity transmission systems are replacing DC ones step by step. The vector control has successfully solved the effective control of AC motor electromagnetism torque, looking like DC speed regulation system, has realized respective control of flux and torque of AC motor, makes the AC motor frequency conversion speed regulation system have all the advantages of DC speed regulation system.The technique of motor speed sensorless vector control improves the reliability of AC drive system, reduces the cost of systematic realization. The accurate speed identification and reinforcing the robust of system are the key to realize the whole system.The method of using Model Reference Adaptive System(MRAS) to estimate the speed is a high-performance,middling-complicated speed identification method, is the universally accepted speed estimate method this text researches the system of speed sensorless vector control ,based on MRAS, and also brings forward a MRAS self-adaptive observer with the filter link. it can conquer the influence of integral effect, estimate the speed accurately.And adopt the fuzzy control with parameter self-emendation to control the torque current, it not only can improve the control precision, reinforce the robust of the whole system, but also can use it for various different occasions.Based on the theoretical analysis, making use of up latest MATLAB7.1/SIMULINK implement, building the corresponding emulation model, I get the simulated result, according to this result , we can testify the feasibility of the whole system and the superiority compare to the traditional PID control . . In short, with the development of frequency conversion technology , with the development of DSP technology and the improvement of control arithmetic, the performance of speed sensorless motor will be further perfect。...