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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.

The electromechanical interaction in rotating electric machines induces additional forces between the rotor and the stator. To study the influence of these forces on the dynamic behaviour of the rotor on nonlinear anisotropic supports, a simple computational model was developed. The aim of this study is to analyse the dynamic behaviour of the rotor of the three-phase generator with one pole pair, in dependence on the rotor angular frequency.

The magnetic stiffness of the air gap is obtained as a function of the deflection of the rotor of the generator. This dependence is approximated by a power series. The influence of the unbalanced magnetic pull on the natural frequency of the rotor of the generator is studied by harmonic balance method.