Re: Huge MMC?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux" <jimlux-at-jpl.nasa.gov> 

You'll need many joules (I use at least 3-4 kJ to shrink a quarter.. In
theory, you can do it with a lot less: the deformation energy is probably a
few tens of joules)

Get a surplus energy storage cap.  Even at the "retail" surplus places they
run about 10% of new price, which would be a tiny fraction of how much it
would cost just to buy enough caps for a MMC.


----------
> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Huge MMC?
> Date: Saturday, December 09, 2000 12:16 PM
> 
> Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
> 
> Hi,
> 
> MMC caps can easily withstand twice their rated voltage.  So you can put
> 3200 volts on a 1600 volt caps for special stuff.  However, the quarter
> shrinker needs like 100uF I think, so you would need many many caps or
many
> big snubbers.  Probably in that size, the surplus commercial caps are by
> far the best.  for a single pulse discharge application, MMC caps are
> probably overkill.  Just the old oil/paper/poly caps do that very well at
a
> vastly reduced cost.
> 
> Cheers,
> 
> 	Terry
> 
> 
> At 07:47 PM 12/9/2000 +0000, you wrote:
> >Terry has frequently mentioned that RMS current will kill our MMC caps.
> >
> >How peak current sensitive, and voltage sensitive are they?
> >
> >I was wondering if a string of 2 or maybe 3 1600 volt caps would
withstand a 
> >10Kv charge to be part of an MMC for a Quarter Shrinker type device, or 
> >exploding water, or any of the other pulsed power devices.
> >Could an MMC of ________(fill in type/number) caps compare with a
surplus 
> >Maxwell cap from Surplus sales of Nebraska?
> >
> >Thanks,
> >Michael.
>
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