“Yet another axial” down under

Another ferrite magnet alternator project.  This one is on the Backshed discussion board hosted by Glenn ‘Gizmo’.

The stator is supported at the centre, which is a bit more compact but the supporting bolts between magnet rotors restrict the overall size, and the stator mounts are more critical.  My first ever pma was a bit like this, and I have been thinking about posting about that one day too.

The stator is really quit a beautiful if delicate thing:

12V cut-in is at 170 rpm.  Glenn used 132 turns of 0.91mm wire in each coil and then connected the phases series/parallel in pairs.  The 3 phases are wired star/wye.  I would not expect it to be able to sustain more than about 2-300 watts for long periods.

The magnets (which are surprisingly long) seem to be held in place with plywood.

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