Here is a small selection of my generating machinery. On the engine is a DC motor from a large printer, on the table left rear is a Sturmy Archer hub dynamo (AC) that I had set up for a wind mill. Right rear is the alternator from my post above, front left, the black tube hides a DC motor from a kitchen stick mixer, and the one on the right is a little DC motor from a HP printer. You only get out what you put in, so it's the one with the best bearings that wins, all of these 5 end up the same with that or similar power motors.