Indirect rotor field orientation vector control for induction motor drives in the absence of current sensors

Abstract

This paper proposes a simplified vector control implementation strategy that can be realized in the absence of current sensors. In order to decouple the torque and flux in the determination of the three-phase voltage reference commands of the SPWM inverter, both stator and rotor currents in the stationary and rotating frames can be derived from the corresponding rotor flux-oriented vector control requirements and motor dynamic equations. A sensitivity analysis to study the effect of parameter deviation or mismatch is also investigated. Simulation results are presented to demonstrate the feasibility and performance of the proposed methodology.