Research Speed Sensorless Vector Control For Induction Motor Based On Interactive MRAS Fuzzy Adaptive Theory

Based on the speed sensorless vector control, the principle of vector control of inductionmotor is introduced in this paper, and the space vector modulation (SVPWM) is combinedfor the realization of asynchronous motor high performance.In many research method about speed sensorless vector control, the model referenceadaptive system (MRAS) based on the stability theory is selected on account of its simpletheory, easy complement,good static and dynamic response, high robustness and strongcapacity of resisting disturbance to improve speed estimation accuracy in this paper. Theimproved voltage model is choose as the reference model of speed estimation, the currentmodel based on the two-phase rotating coordinate system as the adjustable model of speedestimation according to the model reference adaptive control theory, the difference of rotorflux is reached by Popov hyperstability theory, obtains the rotor speed signal by the adaptivecontroller. The speed estimation is influenced greatly by the stator resistance though theoryanalysis. By using model reference adaptive theory premise, to compose of stator resistance,voltage model for stator resistance adjustable model, current model as the reference model,the interactive MRAS system，is formed by the speed of identification model and the statorresistance of identification model, so the robustness of the system the stator resistance ofinduction motor is improved greatly. The motor mathematical model uncertainty and thelarge torque ripple problems can be overcome by Fuzzy adaptive PI in rotor controller toimprove dynamic performance.Finally, the interactive MRAS fuzzy adaptive speed sensorless vector system model isbuilt by the Simulink and the relative modules are briefly analyzed. The simulation resultsshow that this method is feasible in high performance induction motor speed control system.The fully predecessors achievements are absorbed in this paper, a small study is made bythe author to hope the latter play an important role.