All A/C generators consist of a rotating, polarized magnetic mass, called a rotor. All rotors perform the same way, but there are several designs to obtain the magnetic field. Most are fed by an automatic voltage regulator. The current applied to the rotor directly relates to the output of the generator. The rotor spins inside the stator. the stator is made of multiple poles with windings. Each winding has a terminal end, so by configuring different ends together you can change the generator phase and voltage. Voltage regulators work by sensing the voltage of the generator output, and increasing current to the rotor windings when generator output drops. Here is the take home point: where the regulator gets its power. Some regulators get their power from the sense wires from generator output. This works until a heavy load is applied to the generator, causing significant voltage drop. The regulator compensates by increasing power to rotor, but its power is limited due to the excess load on the generator. This causes extended recovery time. Optimum generators, including our WEG units, have a separate winding in the stator, solely for powering the regulator. When the load is applied and voltage drops, it does not affect this auxiliary winding. The regulator always has all the power it needs to quickly adjust and recover from heavy loads.