>> The shaft speed HAS to be a constant 3600 RPM to generate 60 hz (or 3000 RPM for 50 hz).

> Incredibly brilliant observation - for ca. 1940; but most alternators now have more than one pole.

Actually, all small AC generators have exactly two poles and have a shaft speed of 3600 RPM to achieve 60HZ. Some small gensets cheat and run slightly faster to compensate for droop. Larger gensets have four poles and turn at 1800 HZ.

> - Ever hear of Mr. Maxwell?
> - Helmholtz?
> - differential calculus?

Ever hear of a shop manual? They are loaded with practical answers to how gensets work. You can find one at a book store or library.