I know nothing about a lot of things generators included but:
The frequency of any ac generator in hertz (Hz), which is the number of cycles per second, is related to the number of poles and the speed of rotation, as expressed by the equation:
F = NP/120
where P is the number of poles, N is the speed of rotation in revolutions per minute (rpm), and 120 is a constant to allow for the conversion of minutes to seconds and from poles to pairs of poles. For example, a 2-pole, 3600-rpm alternator has a frequency of 60 Hz; determined as follows:
2 x 3600 / 120 = 60 Hz
A 4-pole, 1800-rpm generator also has a frequency of 60 Hz.
A 12 pole, generator with the PTO running @600 rpm generator would have a frequency of 60 Hz.
I have no idea where you would find a 60Hz 12 pole generator /forums/images/graemlins/confused.gif