Research of parametric vibrations of drive shafts in induction machines

Abstract

A description of transient phenomena in an induction machine in connection with oscillation excitation in low–damped drive systems requires the solution of a system of nonlinear differential equations. The coupling of variables from the electrical and mechanical system in the differential equations complicates the physical interpretability of the observed phenomena. The paper shows how non-stationary oscillations in the drive shafts, produced by transients in the induction machine, are explained in terms of parametric excitation. The knowledge of the excitation mechanism enables a simple excitation diagram to be constructed, indicating the critical speed ranges for the excitation of oscillations.