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Optimal control of magnetizing current for minimizing induction motor powerlosses during load torque step change was developed. Obtained strategy hasfeedback form and is exactly optimal of ideal speed controller performance andabsence of saturation in motor. The impact of limited bandwidth of real speedcontroller is analyzed. For case of main induction saturation the sub-optimaloptimal control is suggested. Relative accuracy of sub-optimality is studied.Hardware implementation of optimal strategy and experimentation conducted withinduction motors under vector control.

Energy Efficient Control of an Induction Machine under Load Torque Step Change