RE: [TCML] 400 hz variacs

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

You will find that the 47-400hz units are for low power operations.

For higher power operations, the materials of the core are different for
60hz and 400hz.

400hz power transformers are a lot smaller and lighter than their equivalent
60hz units. They were developed for use on airplanes where size and weight
were an issue. Also, less filtration needed when converting to DC. An
elegant hack...

Dave

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Jim Lux
> Sent: Sunday, December 12, 2010 9:26 AM
> To: Tesla Coil Mailing List
> Cc: tesla@xxxxxxxxxx
> Subject: Re: [TCML] 400 hz variacs
> 
> 
> 
> On Dec 11, 2010, at 10:37 PM, HomerLea@xxxxxxx wrote:
> 
> > These seem just as heavy as 120v 1.3 amp 60hz ones. What I 
> don't get is how 
> > some fixed transformers are rated, for example, at 47hz to 
> 400 hz; not 
> > uncommon for military transformers. Guess I should have 
> been an electrical 
> > engineer instead of chemist.
> > Jim
> > 
> 
> They build them for the whole range.   Cross-sectional area 
> for the low frequency.  Thin laminations and low hysteresis 
> for the high._______________________________________________
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