What is an exciter stator in an AC alternator?
What does the excitor stator do?
How does an excitor stator work?
The exciter stator generates a current in the exciter rotor as it spins on the alternators main shaft. Power fed to the exciter stator by the AVR, which is monitoring the voltage from the main stator at the generator terminals. If the voltage decreases below the preset level, the AVR boots the power to the excitor rotor which is in turn paassed through the rest of the excitation system and results in an increase in voltage. If the voltage at the terminals increases above the preset level the AVR reduces the power, having th eopposite effect.