The Volvo V40 Alternator offers the essential advantage of converting engine movement to consistent electrical energy that maintains the battery as well as all other devices on the vehicle in operation. This Alternator comprises two cast aluminum halves and has a stationary stator, a belt-driven rotor, and front and rear bearings allowing the pulley to turn freely with a cooling fan forcing air through the case. As the crankshaft belt rotates the magnetic field of the rotor around the windings of stator coils, the law of Faraday comes into effect, and AC current is induced, and a rectifier fitted to it converts the current into DC current that the car actually consumes. A voltage regulator adjusts field current to ensure that the result is not too low or too high. The early Volvo versions depended on an external or simple internal regulator, though subsequent Volvo models incorporated the same into the powertrain control module so as to be better integrated with engine control. The fundamental Alternator layout remained unchanged over the years, but designers have applied two excitation types, either standard field coils or permanent magnets in more efficient compact units and enhanced cooling from basic air flow to directed fan blades for higher loads. Regardless of the generation, all Volvo systems are directed towards the same objective, which ensures that a V40 driver receives a reliable set of lights, infotainment, and starter power as long as the crankshaft is turning.
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