Impact of electrical machine structural parts on its modal and vibration behavior

In the paper, authors deal with the case study of an impact of stator frame and vertical mounting on modal and vibration behavior of a squirrel-cage induction machine. The study is performed using finite element analysis where resulting magnetic forces from magnetic transient analysis are set as an excitation in the analysis of harmonic response. Modal analysis is carried out to identify the modes and natural frequencies of the modeled structures and their possible effect on vibration spectra. Resulting vibration spectra are compared to the analysis of a solely stator lamination and to the experimental results on the full machine assembly