Loss minimization of a fuzzy controlled induction motor drive

Induction motors have good efficiencies when operating at full load. However, at lower than rated loads, which is a condition that many machines experience for a significant portion of their service life, the efficiency is greatly reduced. This paper describes the use of fuzzy logic to optimize the efficiency of an induction motor drive while keeping a good dynamic response. The proposed fuzzy controller adjusts the magnetizing current component, with respect to the torque current component to give the minimum total copper and iron losses.