If you are asking how to obtain 60 hertz power output; the generator armature shaft must be turned at 3,600 rpm. Many small craft marine type generators as well as standby genrators are mated to engines which are governed at 3,600 rpm. Other manufacturers in order to reduce noise, vibration, and fuel consupmtion have gone to a 2:1 gearbox or pulley drive that spins the generator at 3,600 rpm. PTO generators are geared in a variety of drive ratio's but the bottom line is the generator must be spun at 3,600 rpm if you want 60 hertz power.

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