That would make more sense. I was not aware of a difference between the rotor speed and the crank speed. Guess I'm thinking Parallel motors and fours, where they tack them on te end of the crank opposite the clutch all the time. I know the 5000 RPM
output is a common reference point. My SV650, EX500, EN454, VN750, VT750, and VT1100 ALL used 5000 RPM as the max output reference point. Maybe that has something to do with the frequency of the AC voltage coming off them. It could be that that is the point where the output sine wave is the most consistient.
I don't know! I'm a structures guy, not an electrician! I can read a print and chase a few sparks, but Ohm's Law and Watt's law are not tatooed on my brain!