Nitogen Cooled Super Conducting Motor for EVs

[Anonymous]

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[Link]

Whoa, a WHOLE 13% longer. All it takes is a complete supercooling system and high-temp superconductors to do it.

Guess the racing crowd might get some use out of it, but I'm not particularly impressed. :?

 

[Anonymous]

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[dirty_d]

hmm save 13% energy, how much energy went into making the liquid nitrogen?

 

[Drunkskunk]

Interesting.
its got a cool factor of about 8.

But conventional copper wound motors can break 95% efficancy, and silver wound can break 98%, so at best its a-4% efficancy gain over a conventional high end motor.

 

[dirty_d]

no, conventional motors have 98% peak efficiency, by lowering resistance you can lower the losses under heavy load substantially. for a superconducting stator you surely would need some form of current limiting, i can easily graph this out, i don't know what the resistance is but it says its almost 0, so 0.001 ohms seems fair enough, its probably much lower even since its superconducting.

 

[dirty_d]

this is what the power and efficiency would look like for that motor assuming the resistance is 0.001 ohms in superconducting mode and a current limit of 100A. thats a nice looking efficiency curve right there. this is only going to help during acceleration though, like in city traffic. steady state on the highway would be about the same. its likely that the energy you save from this for however long it takes the liquid N2 to boil off is less than the energy it takes to make more liquid N2, so its a net loss.

edit: the peak is below 90% because i accidentally put 10.0A as the no load current, it would probably be more like 1-3A and the efficiency closer to 100

 

[Miles]

Doesn't superconducting mean zero resistance? From the coils only?

 

[Link]

If the efficiency curve looks close to that, I take part of it back; I still think it won't be useful for the average driver, but I am now impressed.

 

[Miles]

Better hide this from safe ......

 

[Link]

Doesn't superconducting mean zero resistance? From the coils only?

It would also make the core superconducting (decreased losses from eddy currents) and increase the strength of the magnets.

Better hide this from safe ......

I don't think so. A liquid N2 intercooler is quite a bit of a step up from strapping a block of ice to a motor. :wink:

 

[dirty_d]

i don't think its quite superconducting since its one of the high tempurature types, it said almost 0ohms so i dunno exactly what that means.

 

[dirtdad]

Darn, my physics degree is fading fast. Once you get a current flowing in a superconductor, it does not stop. It is the frictionless plane of electricity. That means you can juice up the electromagnet with current and let go the throttle, it will keep going. But achieving a superconductor state takes energy, too. So can you find a way to create a superconductor state that takes less energy than it takes to run the motor? It is a bit like fusion. Sure it takes a lot of energy to get it going, but once you do...whammo.

 

[Miles]

i don't think its quite superconducting since its one of the high tempurature types, it said almost 0ohms so i dunno exactly what that means.

I understood the superconducting state as a qualitative change - so, I'm not sure what they mean, either....

 

[disadvantage]

hmm save 13% energy, how much energy went into making the liquid nitrogen?

I like how you think. Nitrogen cooled super conducting motors are impractical for common everyday EV use.

 

[lawsonuw]

Re: resistance in superconductors
With no magnetic field superconductors are perfect with no resistance at all. The rub comes when you make a magnetic field with them. Eddys form in the current flow and energy is lost. The net effect is that any superconductor stops superconducting in a sufficiently strong magnetic field. This is what I remember from the technical articles I've read.

I think this starts making sense for larger motors. Say a traction motor in a train or maybe a motor for a ship. On the scale of a car the cryogenic system would just be a pain in the a$$.

Marty

 

[Link]

Say a traction motor in a train or maybe a motor for a ship. On the scale of a car the cryogenic system would just be a pain in the a$$.

Yeah, that's my thinking. The weight difference on something of that scale would be comparatively small, and the cost savings on power could be potentially enough to make it worthwhile.