The problem with that argument is that the “bigger” rotor is from a 12v alternator, the “smaller” rotor is in a 48v alternator.
the jump from 14v to 56v is 400%, the jump from 48 to 56v is 16%.
I can’t buy the argument that to go from 48 to 56v you need a rotor from a 12v alternator because the 48v one can’t handle it.
It’s also arbitrary to claim to know the exact difference in these rotors they could just be a different coil finger shape. The manufacturer themselves say the 48v and 56v alternators are the same save the regulator. The manufacturer doesn’t view the rotors as significantly different. It could be as simple as a minor revision.
the jump from 14v to 56v is 400%, the jump from 48 to 56v is 16%.
I can’t buy the argument that to go from 48 to 56v you need a rotor from a 12v alternator because the 48v one can’t handle it.
It’s also arbitrary to claim to know the exact difference in these rotors they could just be a different coil finger shape. The manufacturer themselves say the 48v and 56v alternators are the same save the regulator. The manufacturer doesn’t view the rotors as significantly different. It could be as simple as a minor revision.