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Re: Induction heating in torroid / short circuit of secondary

Hi Colin,

	That's exactly what I use with great success.  I use two stainless steel
pizza pans (cheaper than aluminum versions).  I get a 3/8 inch piece of
all-thread rod and a few nuts to space them out about four inches.  I then
use 8 inch duct around the outside which naturally matches the ten foot
length.  I use aluminum heating duct tape to connect the ends and tape
around the pan to duct joint to get good electrical contact.

	The shorted turn problem makes good theoretical sense, but in practice, no
ill effects are noticed at all.

Cheers,

	Terry

At 11:36 AM 12/18/1999 +0000, you wrote:
>I'm currently building my second tesla coil and having looked at the various
>options have decide to make a torroid out of aluminium ducting.  To provide
>a form for the ducting I was planning to use two pie tins fitted back to
>back, with the tapered rims forming a good match to the shape of the inside
>of the ducting (i.e. something like O>==<O).  
>
>I've got two worries though, where I'd be interest to hear other people's
>views and experiences.
>
>1) If I use steel pie tins will I get problems with induction heating?
>2) More generally, does the complete conducting loop of the torroid act as a
>short circuited turn coupled into the flux of the secondary?  If so, would
>it be better to leave a gap in the torroid to minimize power loss?
>
>Thanks,
>
>Colin.
>