Coupled magneto-elastic FE model for simulation of electrical machines

Abstract

This work presents a magneto-elastic FE model for simulation and analysis of electrical machines. The model includes magnetic non-linearity and stress dependent magnetisation. Magnetostriction and effects of geometry changes on magnetic field are accounted for. The circuit equations of the windings are solved simultaneously with the magnetic and displacement fields. Calculations without magnetostriction, show that the radial displacement of the stator core of a synchronous machine is lower than the one calculated with a non-coupled model. The difference in displacement field suggests that the magnetostriction changes due to a difference in stresses. Measured magnetostriction at different stresses is also presented for comparison.