[elihu]

Nah, the main thing is that electric motors are already far better than they need to be -- even assuming the claims are all true, it would only make a small difference.

Shaving a couple percent off the total vehicle weight would still be a very good thing, but improving batter energy density by 10% or so would be a bigger deal for most EVs.

There might be some niche applications where the battery weight isn't the biggest issue -- like very short-range, light-weight vehicles that need to have enormous amounts of power for some reason.

I could see motors like this being used in power tools if they can be scaled down. A light-weight plug-in electric chainsaw would be pretty awesome.

[nandomrumber]

> A light-weight plug-in electric chainsaw would be pretty awesome.

These already exist, in both plug-in and cordless / battery powered.

[elihu]

Small wimpy ones are widely available. I'd love to have an electric chainsaw that runs on 220v and has a respectably long bar, but those don't seem to be available in the US as far as I can tell.

At 30 amps and 220 volts, that would be about 8 horsepower. I think most motors that size rated for that much continuous power would be rather heavy.