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Re: HV at very LOW freq. Tesla Coil




From: 	Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
Reply To: 	bert.hickman-at-aquila-dot-com
Sent: 	Wednesday, September 17, 1997 12:20 AM
To: 	Tesla List
Subject: 	Re: HV at very LOW freq. Tesla Coil

Tesla List wrote:
> 
> From:   Jean-Marc Patten[SMTP:jp001-at-mail.orion-dot-org]
> Sent:   Tuesday, September 16, 1997 12:06 PM
> To:     Tesla List
> Cc:     'Tesla List'
> Subject:        Re: HV at very LOW freq. Tesla Coil
> 
> well i have about 10 oil burner xformers at 10Kv -at-10Ma but i dont think
> they will have the juice to do the job. But to answer your question about
> 10cps <10Hz>. I have looked all over the net for info but everyone is High
> voltage high freq.
> thank you for responding
> 
> john
> 
> On Tue, 16 Sep 1997, Tesla List wrote:
> 
> >
> > From:         Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
> > Reply To:     bert.hickman-at-aquila-dot-com
> > Sent:         Tuesday, September 16, 1997 8:18 AM
> > To:   Tesla List
> > Subject:      Re: HV at very LOW freq. Tesla Coil
> >
> > Tesla List wrote:
> > >
> > > From:   Jean-Marc Patten[SMTP:jp001-at-mail.orion-dot-org]
> > > Sent:   Monday, September 15, 1997 4:22 PM
> > > To:     tesla-at-pupman-dot-com
> > > Subject:        HV at very LOW freq. Tesla Coil
> > >
> > > I Need any info on this subject i am researching this befor i invest to
> > > much $$ all info wanted
> > >
> > > thankyou
> > >
> > > John
> > > jp001-at-mail.orion-dot-org
> >
> > John,
> >
> > How low a frequency? How big a coil you willing to make??
> >
> > -- Bert --
> >
> >
> >
> >
> >

John,

A Tesla Coil's operating frequency is determined by the electrical
characteristics of the secondary and the top terminal. In general, the
bigger the physical size of the system, the lower the operating
frequency. In order to operate at 10 Hz, truly gargantuan sizes are
needed:

Let's assume that we make a toroid of 40 feet by 5 feet, and put it atop
a coil 20 feet in diameter with a winding 30 feet high, with 800 turns
of space-wound #1AWG wire. The toroid capacity will be around 400 pF,
the resonator self-C will add another 290 pF, and the resonator
inductance will be about 2 Henrys. The combination will yield an
operating frequency of about 4 kHz. 

Hmm... we still need a bigger coil and toroid. Let's double all
dimensions, and try again, but space-wind to get the same number of
turns:
Toroid Size = 80 x 10 feet;   Ctoroid ~ 900 pF  
Resonator size = 40 feet diameter and 600 feet high; Cself ~ 575 pF
Resonator Inductance ~ 3.9 Henry.
Resonant F = 2 kHz

Well, as you can see, getting down to 10 Hz would be quite a challenge!
It turns out that a resonator about 1500 feet in diameter and 2250 feet
high topped by a toroid of about 6000 feet x 1000 feet would do it. That
would even put Greg's new monster coil to shame! And it might take most
of the electrical power capacity of the North American continent to fire
it up properly...

Safe coilin to you, John!

-- Bert --