MINIMUM-ENERGY CONSUMPTION OF AN INDUCTION MOTOR OPERATING IN DYNAMIC REGIME

Abstract

A new control strategy for Induction Motor (IM) operating at variable speed and torque is proposed in this paper. The entire purpose is to introduce a new energy optimization approach using dynamic constraint of rotor variables under Rotor Field Oriented Control (RFOC). Such control strategy is based on a designed cost function given as a weighting sum of stored energy, coil losses, and mechanic power. The proposed algorithm is devoted to establish the optimal dynamic of rotor flux versus the motor speed by taking into account two constraints linked to transient regimes of rotor flux and speed. From such algorithm, a time-varying rotor flux values can be determined which optimizing IM energy. Aiming to check it validity, the proposal was implemented in a RFOC of a 1.5 kW laboratory IM. Regarding to recent works and to the presented algorithm results, better performances can be obtained since lowest energy consumption of the IM is reached in dynamic regime.