Research on reduction of vibration and acoustic noise in switched reluctance motors

This paper describes an investigation into the reduction of vibration and acoustic noise in switched reluctance motor. The vibrations of electric motors are mainly determined by two factors, radial force excitation and structure borne transfer function. The radial force, which is the dominant source of vibration, was analyzed analytically first. Based on the analysis, it was derived that vibration could be reduced by increasing electrical constant time and delaying radial force falling time. Modal analysis was carried out on precise mechanical models of prototype motor in three dimensional finite element method (3D FEM) software to study the structure borne transfer function. Experiments were set up and the results verified the analytical and numerical results.