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I gave gold some thought a while back, but the primary problem with gold wire is that it is so soft that it wouldn't stand up to the thermal loads that a motor goes through. Silver is the best wire you can put in a motor AFAIK. I looked into high-temp superconducting wire, but a) "high" is a relative term...it still has to be cooled by liquid nitrogen, and b) as best I could tell, superconducting wire isn't more conducting than regular wire at room temperature. I read 1 thing that said copper-aluminum alloy wire is even better, but I couldn't find a 2nd source to verify much less a vendor. Hell, it's hard enough just finding vendors for silver wire. Only one I've found is rcbutlers.com with .50 and .55 wire. I'd love to find specialists in motor wire that have more varieties of widths and materials as well as datasheets.
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