Affiliations: [a] Eomys Engineering, Lille Hellemmes, France | [b] L2EP, Ecole Centrale de Lille, Cité scientifique, Villeneuve d'Ascq, France
Correspondence:
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Corresponding author: Quentin Souron, Eomys Engineering, 121 rue de Chanzy, 59260 Lille Hellemmes, France. E-mail:[email protected]
Abstract: This article demonstrates the use of a mathematical method to efficiently discriminate and
visualize each circumferential vibration wavenumber involved in the yoke deflections of an electrical machine under electromagnetic excitations. This post-processing, which can be applied on both experimental and simulation data, allows to calculate the participation factor of each magnetic force wavenumber at a particular frequency. It is therefore a powerful visualization tool to understand the origin of magnetic vibrations and acoustic noise. The resulting graphs, called ``spatiograms'' as an analogy of the spectrograms done at variable speed, are based on the Discrete Fourier Transformation of the accelerations measured along the machine circumference. This paper explains the post-processing calculation and shows some numerical and experimental validation on both an induction machine and a permanent magnet synchronous machines.
Keywords: Spectrogram, magnetic noise, magnetic vibrations, post-processing, electrical machines, resonance, operational deflection shape
