Localized Maxwell-Stress Excitation and Modal Eigenvalue Analysis for Vibroacoustic Characterization of Switched Reluctance Machines

This paper presents an integrated, tooth-resolved electromagnetic-structural framework linking localized Maxwell surface tractions to three-dimensional stator dynamics and equivalent radiated power in a three-phase 6/4 switched reluctance machine. Transient radial and tangential force vectors are extracted from a two-dimensional finite-element model across six distinct stator tooth tips and mapped directly as remote nodal force resultants onto a three-dimensional solid structural continuum mesh. Baseline and modified geometric configurations are contrasted across matched multi-axial speed-frequency envelopes. The modified layout suppresses peak absolute tangential-force excursions, while radial peak loads are redistributed temporally rather than uniformly minimized. All six reported natural frequencies decrease non-uniformly; the fundamental mode drops by 34.01% from 3166.3 to 2089.5Hz, maintaining a safe separation margin above the 1000Hz excitation band threshold. Consequently, the modified configuration yields uniform attenuation across both the 0–250Hz forced deformation response curves and the non-overlapping decibel waterfall scales. These results demonstrate that vibroacoustic attenuation stems from the coupled phase interactions of the structural compliance matrix and multi-axial loading vectors rather than single-parameter force minimization, establishing a highly reliable numerical radiation indicator for design-stage benchmarking.