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Home > Forums > Electrical / Electronic Engineers > Activities > Electric motors, generators & controls engineering Forum

Low-Cost Generator Design: Best Neodymium Magnet Shapes for AFPM

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FullPowerInc (Electrical)

3 Mar 12 2:03

This continues from my other post titled "Low-Cost Generator Design" to help the poor people in our country recover from the earthquake devastation here.

I need to design a low-cost generator that can produce about 80W/hour and 160W/hour. I see various AFPM (Axial Flux Permanent Magnet) designs, but I don't know how to evaluate which are the best approaches. I wrote down questions that I'm trying to solve:

What is the best magnet shape in regards to overall generator performance and cost? Rectangular or Arc-Segment?
Is it more cost effective to use larger weaker magnets with longer coils for the magnets to cross over?
Is it more cost effective to implement an iron-core into the design rather than an air-core?
Instead of wrapping several iron straps into a core, why not use Carbonyl Iron or similar iron/resin mixture to make the iron core?
Can place coils on both side of the iron core (top and bottom) and sandwich them in between a matching pair of magnets? I was wondering if this offered greater efficiency.
Can I overlap each of the 3 coil phases onto each other to squeeze in more performance?
Is there any advantage to spreading the coils out wider and more flat? or should I just keep the coils as round or square based upon some of the principals found in the Brook Coil design?
What formulas help me to correctly design an axial-flux generator to maximum potential?

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