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homemade induction heater
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lordedmond:
to muddy the waters

I used to install and maintain induction furnaces  from 56 pound  to 11 tons

the 11 ton ones were 1.5 mega watt units

we used to melt ferrous metals in all of them

but what I do know is that the smallest size one was run at a much higher frequency that the big ones  these ran at 50 hz  but the smaller one ran at 200 hz  this was done because as the size goes down the % goes with it hence the inc. in HZ

all of these furnaces were parallel resonant circuits with water cooled coils , I cannot remember the volts for the small ones but the big ones had a coils voltage of 1kv, the operators just adjusted the cap bank for unity PF


at a small scale you would need to go to a HF source  , heating is one thing melting is a different ball game , its the eddy currents that do the work nothing to do with the ferrous properties as iron/steel is none magnetic over a certain temp ( infact you use that property to establish the correct temp for hardening the metal when the magnet will not stick its hot enough )

Stuart
ironman:
To HS93

 Here are two links,

one is a forum about building homemade induction heaters  http://lists.neon-john.com/listinfo.cgi/induction-neon-john.com

The other has detailed info on how to build one  http://www.neon-john.com/Induction/Roy/Roy.htm
Clayton:
I am looking to build a oil heater, would just winding copper wire around a 2" pipe and plug into 220V 50Hz work? does not need to heat up fast or go above 300-400 C
awemawson:
It'll certainly BRIEFLY get hot, just before the fuse blows  :lol:

More constructively, 50 hz induction furnaces do exist in industry, the the charge has to be large to resonate at 50 hz and the circulating current, and hence the draw from the grid is huge, usually including dedicated sub station at the works
Joules:
Just thinking out loud, but would a single phase to 3 phase inverter that can output upto 360hz be the basis for an HF power source ?
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