Looking in my fundamental training documents i found:
Most aircraft generators need an input speed of 12,000 RPM because they are equipped with two pole pairs.
But aircraft generators with input speeds of 24,000, 8,000 or 6,000 RPM are also used. This means that the number of pole pairs can vary from one to four.
... please try to learn the difference between fundamentals and aircraft related data.
Is it so difficult to give us the related Aircraft when you quote the AMM?