Generator exciter

S

Sebastian Rebord

The voltage obtained after the rectification have less riple than obtained with 50 or 60Hz. Several PMG (Permanent Magnetic Generator) have 400Hz to feed the thyristor bridge of the AVR.
 
> Why are Generator exciter have 150 Hz, 200 Hz Frequency?

There are 12 poles on the excitation stator and so the 3 phase output to the rectifier has a frequency of 150 Hz. The 3 phase bridge rectifier then produces an output voltage with 900 Hz ripple. The output current is heavily smoothed by the high inductance of the main generator rotor.
 
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