How is the output voltage of an alternator regulated?

The output voltage of an alternator is regulated primarily through a device called a voltage regulator. This regulator monitors the output voltage and adjusts the excitation current supplied to the rotor windings, ensuring that the output voltage remains within a specified range. By increasing or decreasing the excitation current, the regulator can control the magnetic field strength, thus stabilizing the alternator's voltage output under varying load conditions. Additionally, some systems use feedback mechanisms to maintain consistent voltage levels despite fluctuations in demand.