Influences of turbo-generator end winding dimensions on electromagnetic loss in the end core and metal parts

For the complex structure of the large capacity turbo-generator in end region, the accurate calculation of the leakage magnetic field became key factor in large generator design. Affected by the leakage magnetic field, there is a problem that the end stator ladder packets, copper screen, press plate has a local high temperature. The three-dimensional electromagnetic field of a 330 MW water-hydrogen-hydrogen turbo-generator in the end region was investigated, and the effect of 4 stator ladder packets was considered in the calculation process. The influences of the end extension of stator and rotor end windings beyond the stator or rotor end 10cm on the losses of the end stator ladder packets, copper screen, and press plate were compared and analyzed. All of these will be help for the turbo-generator engineering design.