Speed Sensorless Vector Control of Induction Motor Based on the Model Reference Adaptive System

In the model reference adaptive system(MRAS) implemented in two axis stationary reference frame,the convergence performance is poor due to the cross feedback relationship between the α-axis component andβ-axis component of the rotor flux when the discrete-time calculation is operated.A MRAS implemented in two axis rotating reference frame was proposed to identify the rotor speed of an induction motor.The reference model and adjustable model used in this MRAS scheme are composed of an advanced rotor flux voltage model and rotor flux current model in two axis rotating reference frame respectively.Experimental studies are carried out on the induction motor experimental platform.TMS320C32 DSP is used as the controller.Experimental results show that the system can estimate the flux and speed with good accuracy,and has a better steady identification characteristic.