As a result of the ac generator rotor is driven by motor through the belt rotating, and the engine and alternator speed ratio is 1.7 ~ 3, therefore ac generator rotor speed range is very large, it will cause the output of the generator voltage, great changes have taken place can't meet the job requirements of electrical equipment.In order to meet the requirement of constant voltage electrical equipment, alternator must with voltage regulator, make its basic maintain a constant output voltage under all conditions.
