Which component should excite a 3-phase alternator to maintain constant frequency?

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Multiple Choice

Which component should excite a 3-phase alternator to maintain constant frequency?

Explanation:
Excitation needs to come from a stable source to keep the generator’s magnetic field steady, so it can respond quickly to changes in load and speed and stay in step with the electrical system. A permanent magnet generator provides that independent, constant excitation source. It feeds the brushless exciter (via the rotating rectifier and AVR) so the main alternator can maintain its output as conditions change. The AVR regulates field current, the rectifier converts the PMG’s output to DC for the rotor, and the battery is a backup source; none of these alone provides the same reliable, independent excitation that a PMG does.

Excitation needs to come from a stable source to keep the generator’s magnetic field steady, so it can respond quickly to changes in load and speed and stay in step with the electrical system. A permanent magnet generator provides that independent, constant excitation source. It feeds the brushless exciter (via the rotating rectifier and AVR) so the main alternator can maintain its output as conditions change. The AVR regulates field current, the rectifier converts the PMG’s output to DC for the rotor, and the battery is a backup source; none of these alone provides the same reliable, independent excitation that a PMG does.

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