Efficiency optimization of vector controlled induction motor drive

In this paper an efficiency optimization algorithm for vector controlled Induction Motor (IM) Drive has been developed and the performance of the IM Drive under different operating conditions has been analyzed. The controllable electrical loss in IM Drive is minimized by the optimal control of direct axis (d-axis) stator current, which controls the magnitude of rotor flux. Thus, the efficiency of the motor is optimized by weakening the rotor flux, which in turn reduces the core losses. The implemented algorithm is tested under different operating conditions of IM Drive including sudden change in load, commanded speed and equivalent circuit parameter variations of IM and performance of the drive under dynamic condition is analyzed in detail.