The Audi A3 Alternator ensures that the miniature hatchback does not die by turning the engine's movement into constant power for the battery and all the gadgets in the car. Within its lightweight two-piece aluminum shell the Alternator contains a stator full of copper windings and a mounted rotor on a shaft, and a pulley and small fan at the front allow the crankshaft belt to rotate the rotor at a speed sufficient to produce a powerful magnetic field. In that motion Faraday's Law generates AC current, which is immediately changed to DC, enabling the lights, the infotainment screens, and the control modules in every Audi to remain alive even when the car is not in motion. To prevent dimming or overvoltage the Alternator unit varies field current on the fly, a feature managed by an internal voltage regulator on earlier Audi generations and on subsequent model years by the vehicle powertrain control module, which oversees the efficiency of the charging requirements at a finer level. All Alternators are designed to have heat-sinking rectifiers, carbon brushes, and two bearings to ensure that the shaft remains straight and to allow cool air to circulate. During the life of the A3 line there were two key styles, the traditional internally controlled and the smart PCM controlled, but they all had one thing in common, that is to transform mechanical work into stable amperage for the rest of the Audi family. This small Alternator enables Audi drivers to operate the heater, demister, and stereo without depleting the battery during the daily commute or weekend sports driving.
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