are you talking about a 3-phse to single phase transformer? this would be to heavy. the problem is not overnight charging, the problem is charging while traveling. You have to use the onboard-charger. Thats make you boring while you can charge on single phase with 32A while the socket offers 3-phase but you cannot make use out of this.
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Is such a device possible? I know about motor-generator sets to do this, but not a transformer.
Too big / heavy / expensive / inefficient? Better ways to do it?
Some discussions here:
http://cr4.globalspec.com/comment/289963/Re-Three-Phase-to-Single-Phase-Transformer
http://www.akihito-shigeno.com/files/EES_E026_030.zip
http://cr4.globalspec.com/thread/55606
Some discussions here:
http://cr4.globalspec.com/comment/289963/Re-Three-Phase-to-Single-Phase-Transformer
http://www.akihito-shigeno.com/files/EES_E026_030.zip
http://cr4.globalspec.com/thread/55606
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I'm too busy today to look into it, but you sure that diagram works? On first glance it seems like all the phases would cancel out on the secondary.
There are certainly working 3 to single phase transformers (of varying efficiency), just not convinced about this particular one.
haha... ok thanks. I thought it looked like nonsense, because all the vectors would add to zero. But I'm always willing to accept that I might be missing something, if I'm not willing to spend the time to think hard about it.
Off the top of my head what would work is L1 to L2 on one primary then L3 to L2 on another. Then the secondaries would be in series. So that's like reflecting one vector about the x-axis and adding it to the first. It still ends up being a bit imbalanced since I2=I1+I3, but the total power you can draw for a given maximum allowable imbalance is likely higher.
Did you guys look through the stuff in here? :
http://www.akihito-shigeno.com/files/EES_E026_030.zip
http://www.akihito-shigeno.com/files/EES_E026_030.zip
We went around this before. There is no way of getting a single one phase output with balanced three phase input using just transformers. The best you can do is 2:1:1 on the input. Believe me, I researched the problem when we were building the HPC network as it would have made life a lot easier if a cost effective solution existed. I called many of the bespoke transformer manufacturers in the UK at the time.
Motor generators are one option that is used, but they are heavy, noisy and inefficient.
The best way to do this is with power electronics and rectify to DC as an intermediate stage.
Motor generators are one option that is used, but they are heavy, noisy and inefficient.
The best way to do this is with power electronics and rectify to DC as an intermediate stage.
Norbert
TSLA will win
I guess that would be DC with strongly varying voltage at that point, but any info on weight, size and price of just such an rectifier?
So, I you'd do this while having a Model S, you would feed that DC to the car
But, the Model S will have native 3-phase charging support (*kugh*), so no need for any external stuff.But, the motor / generator idea, I see this being used in datacenters often. Instead of having battery backed up UPS systems, they use a BIG (900kW) electric motor a HEAVY flywheel and a generator in the same shaft. When the power fails, the kinetic energy in the flywheel will give power for a couple of minutes before the diesel generator kicks in. They claim to have a 98% efficiency, so wouldn't that be possible? Instead of having a AC generator, use a DC generator?
I think typically it is under a minute...
One data center I worked in years ago had something like that.
Along with switching over to backup generator, they can also save you from system resets during short "brown outs."
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Norbert
TSLA will win
So, I you'd do this while having a Model S, you would feed that DC to the car
Internal or external, you still need stuff.
Yes, I would have figured that. But people keep asking about transformers.
By the way, do you know the function of these coils in the Aerovironment CHAdeMO chargers? :
That of course depends on the load you are putting on the system. I thought it was somewhere around 3 minutes. Enough time for the generator to kick in. If it doesn't start within 3 minutes, it won't start.
True, but that will be AC -> DC, not AC 3p -> AC 1p
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