What is an exciter rotor in an AC alternator?
What does the exciter rotor do?
How does an exciter rotor work?
The exciter rotor generates electrical energy as it spins because the magnetic field of the exciter stator cuts through the copper windings of the exciter rotor, inducing a voltage. The induced power in the exciter rotor varies depending on the power supplied to the exciter stator by the AVR, which monitors the voltage at the generator terminals and tries to correct it to a pre-set value.