Rotor/ fridge magnet.
Now this is the bit that interests me. The rotor is aprox 20mm shorter than the windings (magically self centers when you slide it into the windings); my question is- good thing or bad thing, having a magnet shorter than the windings? All I seem to remember is something about magnetic saturation points and increased current flow, but a proper technical explanation would be useful, or comparsions with other motors etc.