A fully digital control of a field oriented induction motor drive using flux observer with and without speed sensor-600 Hz switching frequency case

A field-oriented control method based on a predictive observer with a 600 Hz switching frequency current regulation of the induction motor, with and without speed and voltage sensors, is proposed. Measuring only stator currents and estimating motor speed and rotor fluxes by a predictive state observer with variable pole selection, the stator currents are controlled to be exactly equal to the reference currents at every sampling instant. As a result, the current and torque ripples are reduced, and the speed and rotor fluxes are estimated with low sensitivity to parameter variation. As a result, only current sensors are used for the implementation of the system drive. Simulation and experimental results demonstrated the superiority of the proposed method over the conventional schemes