Primary Coil - Induction Heating Effects

Xplorer, Fri Dec 09 2016, 02:54AM

Perhaps this is a silly question (tried searching for an answer but couldn't find anything)...

Can the primary coil of a TC have an induction heating effect on steel hardware? I have a large 2in diameter steel washer with a 1/4in steel bolt at the base of my secondary coil. Should I be concerned with any energy losses because of it? The frequency is probably around 400kHz (EVRs microbrute).

Cheers.
Re: Primary Coil - Induction Heating Effects
woodchuck, Fri Dec 09 2016, 03:38AM

Count on it!
Re: Primary Coil - Induction Heating Effects
Mads Barnkob, Fri Dec 09 2016, 12:43PM

The primary circuit of a Tesla coil is no different from the one in a induction heater, so yes it will heat up metal in the proximity of the electromagnetic field.

I wrote about this in the primary circuit part of my DRSSTC guide: Link2

Another thing about induction heating is that the primary coil is actually heating up itself from induction heating, one of the biggest losses in primary coils are contributed to proximity losses, which I discuss using Medhurts method in the Secondary coil part here: Link2
Re: Primary Coil - Induction Heating Effects
Hydron, Fri Dec 09 2016, 01:45PM

I have used my TC to cook eggs in a cast iron (induction compatible) frying pan.

Ran for over 10 min at 2kW+ so was a good stress test of the TC in general, and as Mads mentioned above, the primary got warmer than anything else.
Re: Primary Coil - Induction Heating Effects
Mads Barnkob, Fri Dec 09 2016, 02:05PM

I did not cook anything on it, but here is 14kW into a metal plate, highly inefficient!

Re: Primary Coil - Induction Heating Effects
Kizmo, Fri Dec 09 2016, 02:25PM

Your plate is too small and too far away from the coil :p

Re: Primary Coil - Induction Heating Effects
Xplorer, Sat Dec 10 2016, 05:06AM

Interesting. Mads, thank you for posting a link to your site. I will certainly take a look at your content.

Nylon hardware it is, thank you gentlemen.