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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
well, for a first post you are certainly bending quite a few rules, but here goes...
Basically, you are making a tesla coil minus the secondary. If you don't know how a tesla coils works I would recommend you start reading. In any case, you have the transformer charge a capacitor, and then you use a spark gap so that when the voltage on the cap gets high enough it will discharge through a coil of wire. This creates enormous peak currents, which are then transferred to the workpiece much like a transformer would work, you have 100amps in the primary with 10 turns so you get 1000amps into the work piece which is 1 turn.
As much as I hate to send someone to Sams site, his design does more or less work and if you copy it you should get usable results.
But if you want to go further, start doing the math. You start out by taking the power of the transformer (in watts) and divide by 120 (you will want your spark gap to fire 120 times a second as you need to fire at both the pos/neg peaks of the sine wave) to get the amount of energy that you will store in your tank cap. IE, for a 1.2kw transformer, you would need 10joules of capacitors. Then use the voltage (I would say to use 6kv for your calculations as you actually want the cap a little bit better then you calculated) to calculate the capacitance using joules=.5*farads*voltage*voltage. Then all that is left is the coil, and that is where the math gets nasty. Basically, you want enough inductance that LC circuit between the primary cap and the coil will resonate at somewhere between 200khz-1mhz. Some useful tools are and Also, keep in mind that as you put a ferrous core into the transformer the inductance will rise, so design your coil for the higher end of the range.
OR... Just hook the transformer up to a decent cap, quick spark gap, and then fiddle with work coils and see what you can make it do
Registered Member #561
Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
i think i will make an induction heater too "As much as I hate to send someone to Sams site" i will take it you dont like something about him or his site
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You people need to start making an effort. Learn the proper use of uppercase and use punctuation. The correct unit is kV not kv or K. Making a few mistakes is fine, not bothering to make an effort is going to be unpopular.
From the rules: "Do not ask for step-by-step instructions, detailed plans, or complete schematics. If anyone wants to make them available, they will. Try Google or the HvWiki."
I am closing this thread, if you need some specific help with the design you can start a new thread.
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induction heater
