Skin Effect in Squirrel Cage Rotor Bars and Its Consideration in Simulation of Non-steady-state Operation of Induction Machines

摘要

This paper deals with squirrel cage induction machines and their modeling concerning the occurrence of current displacement in rotor bars caused by skin effect. Considering non-steady-state operation such as direct on-line start and especially in the case of sustained ramp-up, e.g., by using Y-D starter or soft starters (thyristor controlled AC voltage regulator), an accurate calculation of current and torque is required. An appropriate numerical calculation model is pointed out and an application example by simulating a double-cage induction machine start-up demonstrates the benefit of this extended machine model.