Improved models for the simulation of deep bar induction motors

Four lumped-parameter circuits to be used in modeling the deep bar effects in rotors of induction motors are presented. Traditionally, the lumped-parameter circuit is obtained by dividing the rotor bar into equal sections; an improvement is proposed which divides the bar unequally to have a greater number of smaller sections at the top of the bar where the current will flow under transient conditions. A complex model is shown to be more accurate than other lumped-parameter models across a wide range of frequencies.>