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Coiled wire can act as an inductor as well...
HowStuffWorks "How Inductors Work"
...An inductor is about as simple as an electronic component can get -- it is simply a coil of wire. It turns out, however, that a coil of wire can do some very interesting things because of the magnetic properties of a coil...
both points true, but given the loose and few coils in the picture neither effect would be even close to the order of magnitude required to raise a concern... right? Just being in the sun would be more heat. As for magnetic field, well doubt it's noticeable next to the much stronger stuff in the car charging system.
I've felt the HPC charging cord going full blast, and the mobile foundry cord (not going full blast). Neither get particularly warm (good thing!)
That's not much of an issue here. There's current going in both directions within the cable, so they cancel out.Originally Posted by TEG
Also realistically speaking the diameter of that loop is so large and since there's only air within the coil (no field enhancing core), any inductance would be quite low.
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Last edited by doug; 09-16-2009 at 09:46 PM. Reason: typo
About a year ago there was a house fire near where I live.
The cause of the fire was an extension cord to a space heater coiled up inside a metal bucket with a pile of rags on top.
They probably didn't know any better, but that was a seriously bad idea.
I was talking about heat buildup. Someone once showed me a picture of a similar cable loop to what I had set up for the photo (with some more loops) that was burned to a crispy critter.
It's just a bad idea to coil loops that are running this much power and I did not want to propagate the idea that it was ok.
The world loves to be deceived.
Just curious: Why isn't Tesla selling something like this?
I'm an ME--not an electrical engineer--so my knowledge of electricity is relatively limited...sorry if I'm restating the obvious...But from what I can tell, VFX's setup is essentially finding two 120V outlets that are out of phase, combining them to build a 240V outlet, and using that to charge, right?
Since you're doubling the voltage, you're essentially halving the charge time, and doing so without requiring special installation of a 240V outlet.
Seems like this would be a pretty popular charging accessory (avoiding the hassle and cost of installing a 240V circuit), so why isn't Tesla selling it?
Is it because it's difficult to find two nearby outlets that are out of phase?
I think you understand the concept. I also think Tesla had made some of those cables for their own internal use, but (for whatever reason) decided not to 'productize' it. Perhaps it is a code or UL thing, or just too hard to find convenient outlets that are out of phase with each other.
I'll put one together for anyone who want but nobody expressed an interest. It's a pretty unique set of circumstances that put you in the place to need the speed of charge but not willing to spring for a rewire upgrade.
I only know of one other person who put one together. Sometimes people build these things and don't post though.
Finding a second out of phase circuit usually takes a long (50' min) 10G extension cord.
At my home I went from 3 to 4 MPHC to 10 to 11 MPHC amps stayed at 16.
The world loves to be deceived.
Visiting friends or family for an overnight visit is the situation for which I would find this most useful.
How much?
Exactly what I thought. You are the first to ask, Dave.
Let me crunch some numbers.
Last edited by vfx; 02-24-2010 at 02:27 PM.
The world loves to be deceived.
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