Flux I like the model you propose. Do you have algebraic/calculus formulas to take it through each step? I'm amazed that flux is half with an airgap 1.5 times magnet width. Exponentially I would expect the br to be worse. I know back Iron thickness does affect flux but I also heard you can increase the length of the back iron and decrease the width without clamping flux. If you'd like to email me at jeraklidis(at)yahoo(dot)com I will complete the project with printable graphs that return in pdf format. It doesn't have to be so indepth like Infolytica (
http://www.infolytica.com/) but I know everyone here would benefit. Imagine changing the number of turns in an edit box and all the power graphs automatically update themselves. I can't do this without the help of you guys and I know its asking for someone or a group to jump on the grenade and say step one
If we want the Number of Turns we use Faraday's equation thus
Nturns = Volts * (( mag teslas * mag area) /rpm)
thus if Volts are changed from say 24v to 48v then the calculation wil change the number of turns needed per coil. Then we calculate resistances then from the number of turns and coil size we use the rpm to calculate amps .... etc
or
q = Slots/ (2 * poles * phases) and start figuring out if a concentrated wire design will work with that combination slot pole combination or how it will need to be wound.
etc
etc
It wont be easy but if you have some free time feel free to email me and I'll work on it.