The Mazda 626 Alternator is the onboard generator of the car, where the rotation of the crankshaft is converted into constant electricity and therefore charges the battery as well as activates all the lights, stereo, and sensors. The two-piece aluminum shell has a stationary stator and a shaft-mounted rotor which rotates a pulley by pulling the belt, and an inbuilt fan which pulls air through the works. As the magnetic field of the rotor passes through the windings of the stator, it produces alternating current, which is then changed by a rectifier with heat-sunk diodes into direct current, which safely charges the battery. The amount of output should be kept relatively constant, and hence the field current is controlled. The early models of Mazda featured an external box or an internal regulator that was attached to the unit, but the current Mazda models delegate this activity to the powertrain control module, the major change over the years. The back housing also carries brushes which feed the rotor, and a second bearing to keep the shaft straight so that there is no vibration. The front fan and metal fins provide heat management by removing the surplus heat when driving over long distances. Due to the fact that each 626 is based on this very specific Alternator system, a healthy Alternator equates to quick starts, bright headlights, and assured usage of the parts by Mazda drivers everywhere.
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