Al Magnet Wire Motors

Now that my utility is calling Cu a "precious metal" in its anti-wire theft campaign what is the status of Al wound motor development?
Supposedly the WWII era Al motors burned up easily but there shouldn't be any reason why they couldn't be protected very cheaply nowdays.
If a motor costs several cents/watt and develops 1 W/gm a motor and the cost of copper is 1 cent/gm maybe a third of the cost is copper.
Bret Cahill
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Bret Cahill wrote:

Aluminum wire requires different connectors than copper. It expands and contracts more with temperature changes. Check with the EEs over at alt.engineering.electrical. They could give you a definitive answer.
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than copper. ?It

Al also melts a much lower temperature but these issues might all be resolved with proper design and controls.
At least one killer is the conductivity of Al is 30% less than Cu which means the coils in an aluminum motor wouldn't pack as tight for the same current & field and the motor wouldn't be as efficient as copper. Since the cost of electricity over the lifetime of a motor might be an order of magnitude more than the motor itself, the 30% increase in capital cost of a Cu motor over Al can be justified with only a 1 or 2% efficiency increase.
Copper probably can provide that efficiency increase.

itive

OK.
I'll also ask about those "pegleg" transmission line towers that have one wood pole leg and one steel with a wood pole running across the top.
Bret Cahill
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snipped-for-privacy@peoplepc.com wrote:

Perhaps silver could be justified in this application.
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What application? Swindling the ignorant?
A 5% increase in conductivity won't result in anywhere near a 5% efficiency increase, certainly not enough to make up for an order of magnitude or so higher capital cost.
Maybe there is some really coincidencial situation where the only motor that will work must be slightly smaller that what is possible with Cu.
But that's a small market.
Bret Cahill
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It might not even be lighter than a Cu motor, Al's only major selling point besides being a somewhat less desirable target for thieves.

If the cost of electricity went way down then Al might make sense.

If it were close they would be fine tuning their spreadsheets.

Sounds plausible. No one here would waste much time sourcing a matching pole just for aesthetics. Add the cheapest support and call it a day.
Maybe they could save some ground wire with the metal poles.
Bret Cahill
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