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In a Synchronous generator, Can AC voltage be used instead
of DC voltage in field winding of rotor to produce AC power?
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Answer Posted / iamdon
No.....AC voltage cannt be used in field winding of rotor
of synchronous machines for following reasons....
1)AC produce poles on rotor whose strength is varying
sinusoidally.It is undesirable because the magnetic locking
between two fields in this case are not achieved troughout
the cycle.At current zero of AC there is no locking at
all.So synchronism will be lost.
2)Field winding is designed for DC. It has higher
resistance.According to Lenz law emf is induced in field
winding.so current flowing through through winding will be
very low.Pole strength is very weak.
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