Generator — General Description (Hyundai Elantra XD)

A generator is a three-phase synchronous electric machine with electromagnetic excitation. The voltage is regulated by a built-in voltage regulator.

When the generator is operating, the electric current flowing through the excitation winding creates a magnetic flux around the rotor poles. When the rotor rotates, the south and north poles of the rotor pass under each stator tooth, and the working magnetic flux passing through the stator teeth changes in magnitude and voltage. This alternating magnetic flux creates an electromotive force in the stator winding.

At a high generator rotor speed, when the generator voltage becomes greater than 13.6–14.6 V, the voltage regulator located in the brush holder is locked and the current does not pass through the excitation winding. The generator voltage drops, the regulator opens and again passes current through the excitation winding. The higher the generator rotor speed, the longer the regulator lock time, and therefore the more the generator output voltage decreases. The process of locking and unlocking the regulator occurs at a high frequency, so the voltage fluctuations at the generator output are imperceptible and can practically be considered constant, maintained at a level of 13.6–14.6 V.

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