Super-twisting strategy based indirect field oriented control without using the currents sensor: application to IM

Super-twisting strategy associeted to indirect field control for induction machine is presented in this paper. The main idea of this strategy is that it doesnt require in the current sensors for controlling the induction machine (IM).Indirect Field Oriented Control (IFOC) is known to generate high performance in IM drives by decoupling rotor flux and torque generating stator current components of the stator current. In order to decouple the torque and the flux, The 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. Closed-loop speed is controlled by the super-twisting to obtain a good trajectory tracking. The objective of the control strategy is to ameliorate the transient and reduce the oscillations on the couple and for a convergence in finite time concerning the rotor speed. The transient response analysis of the IM is also discussed in detail. Results based on matlab simulations have shown that demonstrate the control system demonstrates good dynamic performance and robustness.