AUTHOR : Soon-O Kwon, Ji-Young Lee, Jung-Pyo Hong
ORGANIZATION : International Compumag Society
JOURNAL : COMPUMAG
YEAR : 2005.6.26
VOL : II
ISSUE :
PAGE : 142 ~ 143
In large turbine generator, the flux saturation in the stator
end region is the major design limitation of capacity of large
turbine generator due to the thermal effect caused by eddy
current. Therefore, for the design minimizing thermal
damages, field analysis on the stator end region is essential,
and this leads to the several times of field analysis on the end
region. In addition, transient force distribution on the end
winding is also important design factor to design the
supporting structure of end winding and this force is
calculated by the field distribution and current distribution.
As a quasi-3dimensional analysis, axi-periodic analysis
method is introduced and developed in [1-3]. The results from
previous paper are verified only by measurements in some
regions of end region, because measurement of flux density in
the end region is limited in practical aspects. Therefore,
3-dimensional flux distribution in end region of large turbine
generator is studied by 3D FEA and axi-periodic analysis is
verified by 3D FEA in this paper.
Current distribution in the end windings are studied and
applied to the axi-periodic anlaysis. Magnetic vector potential
is used as a field variables and force distribution on the end
windings and eddy current loss in the flux shield are
calculated in this paper.