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Registered Member #3900
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Before this gets any farther could you start a new thread with your questions as not to jack inducktion's thread? Also, I didn't quite understand what you just asked.
Registered Member #190
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Inducktion wrote ...
Why is the mindchallenger one so much more complicated?
This was a stepping stone for the microprocessor design which allowed it to automatically tune to any workpiece or coil and maintain a lock with heating. Here is the microprocessor design
If you search youtube you can see that you can liquify 5 - 8 lb bricks of steel and levitate steel and copper while melting them. This takes precise control and power. You can not do this by hand-tuning or a simple PLL.
Registered Member #190
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Andy wrote ...
Would making the induction furnace have a greater u/k constant work better. If I surround the work peice and the driver coils with ferrite will it work better.
If you surround the workpiece with high temperature ceramic fiber you will retain the heat, which will speed up the heating process. According to black body radiation, you lose energy to the fourth power of temperature, which is a lot. You can get the material at McMaster Carr. You want the really high temperature stuff that goes almost to 3000F.
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Sorry Induction for hijacking your thread
Hi IamSmooth
Thanks, can that be used for the crucible with a binder? If its amps that does the heating, what would be the minimum voltage that you could use for the work piece, say if you've got 345volts with 100 turns primary would 3.4volts be to low?
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Andy wrote ...
Thanks, can that be used for the crucible with a binder? If its amps that does the heating, what would be the minimum voltage that you could use for the work piece, say if you've got 345volts with 100 turns primary would 3.4volts be to low?
This is the material It is not cheap. This is moldable, but you can not make crucibles out of it. Think of it as temperature resistant cardboard. I pushed it to the limits when I had molten steel dripping on the floor. It really contains the heat. I made an inner tube for my coil and also made a top plate with it.
I never calculated the work coil voltage. I used anywhere from 15-25 turns on the primary going to the LC tank. The work coil had anywhere from 4 to 8 turns depending on what I was doing. Five turns works well for heating nuts and bolts. One hundred turns is a lot.
True, if you have a big step down you can drive a lot of current in the workpiece, but only if you have enough voltage. Your workpiece voltage will be so low you will not get enough current for heating.
Read the tutorial and my experimentation with various geometries.
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Induction Heater Design Question
