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Minimum-energy consumption of an induction motor operating in dynamic regime

In this work a strategy of optimizing losses in an asynchronous machine in the transient regime is developed. The formulation of this strategy based on the dynamic Blondel-Park model used as a physical constrained on the state and control and the cost function specified as a linear combination of the losses and consumed energies. Aiming to find a time variation rotor flux values able to optimize the induction motor (IM) energies conception, the proposed strategy is based on the calculus of variations. An analytical solution is achieved in the case of accelerate model of the IM speed. This solution gave the trajectory of a minimum-energy rotor flux. This trajectory is implemented in the optimal rotor flux oriented control (RFOC) of the IM and compared to the conventional (RFOC). The simulation results confirm the validity of our approach.