The Mazda Protege Alternator ensures that the battery of the compact sedan is charged when all the lights, radios, and sensors are powered on as long as the engine is turning. It has two casings of cast aluminum where a permanent stator is fixed, and a shaft supports the rotor, which is rotated as the serpentine belt travels, generating alternating current by the induction of magnetism. A little fan on the pulley drives air over the windings to get rid of heat, and diodes in the rear rectifier change the AC to continuous DC to keep the battery topped off. Early model years applied a separate or internal voltage regulator to change field current to regulate output, but the powertrain control module took over that task in newer models, where it is electronically managed and there is less chance of undercharging or overcharging. Both approaches are based on common components including twin bearings, brush assemblies, heat-sinked diodes, and a rotor energized by field coils instead of permanent magnets and a balance between cost and high levels of low-rpm charging. The device is placed in either of the cases close to the front of the engine and can easily tap energy off the crankshaft belt, changed into electrical power to power headlights, fuel injectors, and the stereo among others. There is a clean Alternator frame that keeps the bay clean. Since Mazda tuned output to the electrical load of its sedan models, a change in the electrical regulator style necessitates corresponding matching of wiring harness and control strategy among each Mazda generation. All Mazda variants of the Alternator are designed so belts can be replaced easily and to be easily tested, thus making the service life of the Protege driver reliable.
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