Title :
Electrical stress analysis model of stator coil cross-section
Author :
Johnson, D.C. ; Roach, J.F. ; Emery, F.T.
Author_Institution :
Sci. & Technol. Center, Westinghouse Electr. Corp., Pittsburgh, PA, USA
Abstract :
An electrical stress model for a specific geometry of a stator coil cross-section has been developed and used to analyze various conditions that can exist in actual stator coils. A finite element program forms the basis for the model used in the analysis. The developed model is used to determine voltage distribution and electrical stresses in the coil cross-section. Results are obtained in the form of parametric curves which show how the electrical stresses vary as a function of Roebel filler permittivity, Roebel filler thickness and axial position. Plots of internal coil voltage distribution are shown. Analysis of groundwall electrical stress as a function of the curvature of the ground electrode is presented. In addition, voltage distribution is given for internal shielding, gap separations and as a function of filler dielectric constant. An automated model has been developed to perform analyses on coil designs of a wide range of configurations
Keywords :
coils; electric breakdown; electric machine analysis computing; finite element analysis; machine insulation; machine theory; stators; stress analysis; voltage distribution; Roebel filler permittivity; Roebel filler thickness; axial position; computer simulation; electrical stress model; filler dielectric constant; finite element program; gap separations; ground electrode curvature; groundwall electrical stress; internal coil voltage distribution; internal shielding; parametric curves; stator coil cross-section; Coils; Dielectric constant; Electrodes; Finite element methods; Geometry; Permittivity; Solid modeling; Stators; Stress; Voltage;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549322
