In general, an alternator can generate higher current at higher RPM. This is because the rotational speed of the alternator determines the frequency of the AC output, and the higher the frequency, the higher the current output can be. However, the relationship between RPM and current output is not linear. At low RPM, the alternator may not be able to generate enough current to meet the demands of the electrical system, even if the number of windings and the strength of the magnetic field are increased.
To overcome this limitation, some alternators are equipped with a voltage regulator. A voltage regulator is an electronic device that controls the output voltage of an alternator by adjusting the field current. This allows the alternator to maintain a consistent output voltage, even when the RPM varies.
In summary, an alternator can generate high current at low RPM, but the output current will be limited by the rotational speed of the alternator and the electrical demands of the system. A voltage regulator can help to overcome this limitation by maintaining a consistent output voltage.
