Material parameters for the structural dynamic simulation of electrical machines

Abstract

Acoustic noise and vibration of electrical machines becomes increasingly relevant. The determination of equivalent mechanical material parameters of electrical steel is therefore necessary to bound the computational costs of the structural dynamic simulation to practical levels. An analytical model based on fundamental laws of mixture is compared to three different experimental approaches to from test objects. The following approaches are reviewed and compared: Static pressure test, ultrasonic measurements and the fitting of eigenfrequencies between measurement and Finite Element analysis. The forced vibration spectra show good agreement for the FEM fit and the ultrasonic approach. It verified that the FEM fit gives physically correct values.