Sensorless speed vector control based on MRAS of asymmetrical two-phase induction motor using three-leg voltage source inverter

This paper presents sensorless speed vector control of a two-phase induction motor (TPIM) based on model reference adaptive system (MRAS). With this method, the speed is controllable over a wide range. The proposed technique employs both main and auxiliary winding currents or d-axis and q-axis currents, respectively for feedback control, flux estimation and speed estimation. Carrier-based space vector pulse width modulation is used for a three-leg voltage source inverter to provide balanced and unbalanced phase voltages. This flux and speed estimators can be satisfactorily operated in a wide range of speed. The dynamic performance of the proposed method is verified by simulation results.