What is the most common type of alternator used in aircraft AC systems?

The three-phase alternator is the most common type used in aircraft AC systems because it provides several advantages that are crucial for aviation applications.

Three-phase alternators generate power more efficiently and consistently compared to other types. They produce a continuous output as opposed to single-phase systems, which can have instances of zero output during each cycle, leading to power fluctuations. This consistent output is especially important for aircraft systems that require reliable electrical power.

Additionally, three-phase systems can handle higher loads and provide more power with less weight, which is a critical factor in aircraft design where weight savings directly influence performance and fuel efficiency. The balanced nature of three-phase power also leads to smoother operation of electrical components, reducing wear and extending their lifespan.

In terms of installation and maintenance, three-phase systems tend to be more compact and efficient, making them favorable in the limited spaces found within aircraft. This combination of efficiency, reliability, and compactness makes three-phase alternators the preferred choice in the aviation industry.