Influence of magnetic slot wedge on electromagnetic parameters and magnetic field distribution of turbo-generator

The working performance of an electric machinery can be improved by adopting magnetic slot wedge on the stator or rotor. To investigate the influence of the magnetic slot wedge on magnetic field distribution and the saturation reactance of a turbo-generator, a 2-D mathematical model for electromagnetic field of a 150MW air-cooled turbo-generator has been established by considering two different types of rotor slots. It is put forward that using weakly magnetic Cr-Ni alloy slot wedge and high-strength electric magnetic Fe-Cu alloy slot wedge to replace common A1 alloy slot wedge to improve the static stability performance of the generator.