Optimization of electric energy in three-phase induction motor by balancing of torque and flux dependent losses

Abstract

This paper presents the solution of the energy optimal control of three-phase induction motor (IM) by balancing of torque and flux dependent losses. First, we build formula of total losses of motor (iron losses, copper losses and additional losses). Next, we will be group by isd current (flux dependent) and isq current (torque dependent). Then, we use the PI (Proportional-Integral) regulator to control so that the components two of this losses are equal. Output of PI regulator will obtain optimum rotor flux. Motor operates with this flux will make total losses of motor is the smallest. A comparative study in efficiency and tracking performances is given between the proposed optimal control and the classical Field Oriented Control that operates with constant rotor flux norm. © Springer-Verlag Berlin Heidelberg 2014.