Indirect field orientation control of induction machine with detuning effect

Abstract EN

Field orientation control (FOC) methods of an induction machine achieve decoupled torque and flux dynamics leading to independent control of torque and flux as for separately excited DC motor, but they are sensitive to motor parameter variations.

The has present work selects the indirect field orientation control (IFOC) as an effective method for eliminating the coupling effect.

The result show how well the drive performance has been improved by this control strategy.

However, to which extent the control strategy can perform the decoupling relies on the accuracy of the slip frequency calculation.

Unfortunately, the slip frequency depends on the rotor time constant that varies continuously according to the Operational conditions and, then, the coupling effect may again arise.

This paper investigates the improvement in the performance of the induction machine dynamics as the IFOC technique is utilized ; also, it investigates the degradation in dynamic performance when the rotor resistance is deviated from its nominal value.