Minimization of Copper Losses during Field-oriented Controlled Induction Motor Magnetization and Demagnetization

The article presents the design of optimal rotor flux control laws, which minimize losses from flux-producing stator and rotor current components of an induction motor with field-oriented control system. The optimal parameters of linear and exponential magnetization and demagnetization algorithms were determined and analytical expressions to calculate least possible losses in IM windings for sinus-hyperbolical, exponential and linear rotor flux change algorithms are presented. The comparative analysis of considered rotor flux control algorithms was carried out and the recommendations for their implementation in various operation modes were given.