I was able to buy a cheap used permanent magnet alternator, however the seller was not able to tell me much about the specifications. I could determine that it has a built in voltage regulator, however I would have to disassemble it more to check how many poles it has and was wondering if there was a way to determine it from the outside.
By manually turning it slowly it takes 16 "steps" (stable positions) to rotate it one full turn. This seems to point towards 16 poles, since there seem to be 16 magnets. However when looking at some images and reading some documentation about other alternators I am now suddenly no longer sure if it is maybe 8 poles?