Effects of Yoke Thickness Change on the Vibration Behavior of an Electric Machine

The aim of this paper is to present a sensitivity study of the effect of the geometrical changes on the vibration behavior of an electric machine at the stator level. A wound rotor synchronous machine is chosen here. A finite element model (FEM) of tetrahedral elements of the stator is created using ANSYS-APDL. This paper, based on the changed geometrical parameter, presents 2 studies: Variation of the stator yoke thickness and the variation of the stator yoke thickness while keeping the same mass. In both studies, the decrease in the yoke thickness leads to the decrease in the natural frequencies although the mass remained constant. The decrease in the yoke thickness increases the stator flexibility which means that the stiffness is more effective than the mass.