Study on vibration caused by electromagnetic force in the end portion of large‐capacity cylindrical synchronous machines: Improvement of electromagnetic force estimation and verification of degradation on winding insulation

Abstract

SUMMARYA new method for analyzing electromagnetic force in the end-winding portion of large-capacity synchronous generators is provided and evaluated in comparison with 3D FEM electromagnetic analysis. In addition, a method for estimating end-winding vibration during on-load operation is suggested by measured data at factory testing. Moreover, an evaluation method for insulation degradation after operation is proposed for large-capacity cylindrical synchronous machines, where the end-winding portion is the longest and electromagnetic forces on it are the greatest of all rotating machinery.