Re: Permanent magnet Tesla coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <induction@xxxxxxxxxxx>

Hi Ed,
            Different Mike here. Those large power supplies are 
indeed still out there, both the Tube machines (which we still 
rebuild and re-sell) as well as the high frequency motor-generators.
It was not all that long ago that we set up a work station in a roll 
around cabinet that contained the output transformer, tuning caps and 
fittings for the induction coil to be connected to. Welding cable ~80 
feet long was the power tether back to the 150 HP motor-driven 10,000 
Hz generator. They are also known as MG sets. Some are 3 KC, 10 KC 
and higher. Real work horses; Loud but effective. Come to think of 
it, we have a 400 or 800 Hz 10 kW MG here someplace, uses to be a 
small smelter.
Mike

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, August 21, 2005 5:27 PM
Subject: Re: Permanent magnet Tesla coil


> Original poster: Ed Phillips <evp@xxxxxxxxxxx>
>
> "I know that , but why do the 50khz versions weigh so much and are so
> bulky? Iron losses at that frequency?
>
> Mike"
>
> Two problems there.  First, I read  50 Hz when I should have read 50
> kHz, so my original remark addressed the wrong topic.  More to the
> point, were you talking about a 50 kHz ROTATING machine?  I don't think
> there's anything like that around these days, but could be wrong.  All
> of the high-frequency power supplies that I'm aware of involve
> oscillators and power amplifiers, formerly high-power tubes and now
> solid state.  Those could be big and heavy.
>
> Ed