Analysis of stress distribution on end winding of large water filling submersible motor during steady state operation

The computation of stresses caused by electromagnetic forces on the end windings of large water filling submersible motor has a significant role in both the design and the performance assessment. This paper aims to analyze the stress distribution on the stator end windings during steady state operation by a three-dimensional finite element method (3-D FEM). A 3-D model was set up and some complex support structures were simplified. Then the electromagnetic field in the end region was analyzed based on the governing equations and the boundary conditions. The analysis shows that the segments in the middle section are easily suffered with larger radial forces and axial forces, but the circumferential forces in the middle section are close to zero. Finally, the calculated maximum von Mises stress is 3.83MPa, which is smaller than the yield strength of the copper.