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Registered Member #71
Joined: Thu Feb 09 2006, 08:23AM
Location:
Posts: 63
I recently modified my old ignition coil driver and hooked up a small work coil to it to try out induction heating for fun. The work coil is some random 16 gauge wire, ~40 turns.
With 24V input, at ~3A, output freq ~300kHz, I can get a 1.5cm long, 0.5cm diameter steel thread to red hot within about half a minute.
Uhm, is this bad, good, or...? I have no idea how efficient the setup is, so I was wondering if any of you experienced induction heaters could offer any advice? Sorry, if it weren't for the lack of fresh batteries for the camera...
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
This is my setup made today:
It takes about 15sec @ 100V 1A power supply to get this result:
Freq is 270kHz and the screw is about 5mm diamerter just like your object. I'm not sure is it good result neither, but i think it can't be bad to get a screw red with only 100W of power
Registered Member #71
Joined: Thu Feb 09 2006, 08:23AM
Location:
Posts: 63
Ah, very similar results to mine.
My O'scope isnt working, so I just tune the frequency until the current draw is minimal, this seems to provide maximum heating transfer to the steel. Is this how you tuned yours, or am I just strange?
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
I'm tuning my stuff using o-scope connected to transformer's primary or measuring work coil current (my poor self-made current transformer shows about 30Arms in resonance). But in my case current draw is the biggest in tune (as i said before 1 - 1.5A from 50-100V) When it is not tuned current is very small, about 100mA. Hmmm ....
Registered Member #78
Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133
Just in case you haven't already previously seen, here's my thread outlining my prototype 2kW induction heater. Heating iron is quite easy due to hysteresis losses, the trick is to have the coupling between the work coil and the workpiece as high as possible. 75VA to get iron glowing within 30secs isn't bad. from memory, it took me 10secs to heat up a similar object with 200W.
Registered Member #32
Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
Maz wrote ...
this is quality suff guys, i wish i knew more about it.
Then do a web search or ask a specific question here.
wrote ...
E. Make sure each post has a point. Unless you're in the chatting board, there's no need for a one-liner post that doesn't have any real content. Save the one-liners and offhanded comments for private messages.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
That's really great!
A friend showed me how to tap off of the AC on a SMPS. And I can tell you that it takes a while to get red hot even with 800W behind the coil! So you really got it!
I'm going to get away from using a SMPS and do it right. At the time I needed a demo quick for the college open house.
Next step, reduce 3/8 nuts to a molten mass! hehehe
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Induction heating
When it is not tuned current is very small, about 100mA. Hmmm ....
