While there are negatives in this format, mainly cost of extra magnets it does work. There are positives but at less eficiency for quantity of magnets.
However the middle magnetic disc must be steel and requires magnets on both sides, thus the reason most cry fowel.
We tried moulding them in resin and they flew away, but this was not the only problem.
Most cry increase the rotor diamiter, fine but this can become a problem if there is any run out on the discs. There are positive as well in increased diamiter, theory is fine but practice follows some middle ground particually when it involves DIY.
While I am a lone wolf on this I will be building another duel rotor, perhaps fortunatly I am prepared and able to buy the magnets necessary. Because I live off renewable energy I see the benefit in investing in infastructure.
Somewhere in my diary you may find a trail of my failures.
allan down under
