Abstract

The analysis of noise and vibrations under electromagnetic excitations (e-NVH) in electrical machines requires to study the stator mechanical response when excited by Maxwell stress waves. In particular, the notion of unit-wave Frequency Response Function (FRF) is often used in e-NVH simulations to model the mechanical response under electromagnetic excitations and troubleshoot noise issues. However, it is not possible to directly measure the unit-wave FRF on the electrical machines and validate the model. Instead, the experimental modal analysis is often compared to a Finite Element (FE) model. Nevertheless, the fitting of the FE model is a complex and time-consuming task. This article proposes a new hybrid methodology based on experiments for the mechanical FRF and simulation for the magnetic excitations. The goal is to reduce dependence on the FE mechanical model to diagnose the main source of e-NVH. This performed with dedicated experimental measurements and postprocessing. For this purpose, the new methodology build a unitwave FRF from experimental measurements. The methodology is validated with the diagnose of electromagnetic noise issues for an experimental benchmark SPMSM machine.

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