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Alternator VS Generator

Looking over the gensets published cutsheets I notice that Cat uses the "generator" word to describe the electrical machine that produces the AC. Also "generator" is sometimes used to describe the actual set/combo (motor and electrical machine).

In my oppinion, that's confusing, especially because the IEEE and UL define the electrical machine that produces AC as "alternator" and the electrical machine that produces DC "generator".

 

I wonder why is Cat using the "generator" label instead of the "alternator" to describe the electrical machine found on their gensets?