I'm starting my squirrel cage v.a.w.t. project and I would like to have your expert opinion on the following subjects:
First, I have to say that my budget is tight enough to don't want to buy such expensive big size magnets, I've been looking the best price/size magnets and the ones that I already have are the best choice (maybe not for efficiency though).
I have 9x2mm neo n50 magnets, and I was wondering if technically is the same to use a lot of these instead of fewer big ones, where a few ideas came to mind.
1) To use them individually with lots of coils for the size (20mm diameter and 8-9mm air gap and 2-4mm height).
2) If option one is the way to go, would it be better/possible to put more than one row of coils in
the stator? to take advantage of the inner space available, since the coils would be so small.
3) Maybe stack them one above the other (to gain height) and side by side like a 3 by 3 arrangement / 2 by 3 arrangement (for area coverage) and use bigger coils.
...I've calculated the total area of different magnet sizes and these small ones and by all means keep being cheaper than bigger ones even if I use a dual rotor with 3 by 3 2 stack arrangement (in a 9 pole 12 magnets that would be 432 9x2mm magnets). I also have been playing a bit with "K&J magnetic's calculator" to see magnetic differences between sizes.
So, your opinion in this matter is much appreciated since I wouldn't like to spend unnecessary money.
And one last thing, I intend to install my v.a.w.t in a rainy wet area, so trying to minimize maintenance, what do you think about this idea of bearing-less generator?
I'm also thinking that it could be upside down but don't know what that implicates yet...
Well, hoping to get some replies, I thank you all in advance for this forum, your time and good will.