Impact of iron loss on behaviour of vector controlled inductionmachines

摘要

Vector control principles are derived under the assumption thatiron core loss may be neglected. The paper discusses effects of thissimplification on performance of vector controlled induction machines.Indirect stator, air gap and rotor flux oriented control of a currentfed machine are dealt with, with the emphasis on indirect rotor fluxoriented control. Models of vector controlled induction machines thataccount for the iron loss are derived and the mechanism of core lossinfluence on behaviour of the drives is highlighted. It is shown thatdetuning caused by neglecting the core loss will inevitably take place.The amount of detuning is investigated for steady-state operation forall the three types of vector control. A new decoupling circuit forindirect rotor flux oriented control is proposed. The circuit accountsfor iron loss and eliminates detuning which is otherwise present