Design and Simulation of Variable-frequency Speed Ｒegulation Systems of Asynchronous Motor Based on Fuzzy-PI and MRAS

In the report, aimed at the PI regulator and the asynchronous motor vector control system with speed sensor, the speed sensor less adjusting speed system which is the integration of Fuzzy-PI and MRAS was proposed. The expectations and estimates of rotor flux were calculated by its current and voltage model, respectively, the speed identification equation which is based on MRAS was constructed. According to the characteristics of proportional and integral parameter, a set of Fuzzy-PI algorithm that matches the speed regulator was established. The simulation model of induction motor adjusting speed system was set up by the MATLAB /Simulink software. The simulation experiment results showed that the system have good qualities such as fast response，small overshoot and high precision identification, which provides a new idea for the induction motor adjusting speed system.