Finite element simulation of marine generators

The sequence of creating a geometric model is described. The results of numerical simulation of static and dynamic problems are presented. Time oscillograms of flux linkage, phase currents and voltages, forces and moments were obtained. The analysis of the transient process is carried out using the wavelet transform. The study showed that there are three frequency ranges: the area of increasing speed, reaching critical speed and reaching steady state. Analysis of the wavelet transform coefficients gave information about the energy, which is contained in the corresponding frequency components of the series. This numerical model makes it possible to identify the spectrum of voltages, currents, forces and moments corresponding to mechanical and electromagnetic defects. The possibility of diagnosing the eccentricity of the rotor using a model study in starting modes is shown. Eccentricity leads to the appearance of a harmonic component in the power spectrum with a large amplitude with a maximum value at a low frequency.