Hi Fabieville,....I'm currently working with the same magnets,but only a single rotor.I'm just using the wire out of the transformers from the microwave.I couldn't get hardly any voltage with ring shape magnets (probably my poor workmanship though).I found by stacking them the flux became more concentrated because the outer row of magnets are rectangles, centerd over the ring below but you have to use a steel spacer over the ring to make the rectangle stick,the center of the hole is opposite polarity of the mag face. I don't know what the steel does but it works.I made an aluminum cap to go over my stacks, screwed down to the mag backer, only the faces of the rectangles were exposed,but when I spun it up my magnets managed to get out from under the cap, went flying everywhere.So just a word of caution if you do go stacked make sure they are well secured,those magnets will come out of there like bullets,I'm just lucky none hit me. Lots of thin wire in the transformers, 2 ,3, 4 in hand makes various types of guage........good luck.........artv