Computational Modeling of the Dynamic Behavior of the Induction Motor Rotor

Abstract

This paper presents a process of calculating of the dynamic response of the cage induction motor with eccentric rotor, which is excited by unbalanced magnetic pull. The unbalanced magnetic pull, acting on the rotor, was obtained from the results of the electromagnetic coupled field analysis as function of the air gap eccentricity and rotation angle of the rotor bars due to the stator winding slots. The dynamic response of the rotor, excited by the unbalanced magnetic pull, was calculated by finite element time-stepping analysis in Ansys software. The modeling is done for the case when the rotor is parallel due to stator. The obtained results are presented as the trajectory of the shaft center.