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Registered Member #882
Joined: Sat Jul 07 2007, 04:32AM
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Posts: 103
but the last time I checked, I don't have metal spheres lying around my house.
Not yet you don't. Get to casting man! Letting your aluminum sun just plop onto the floor, disgraceful*. Where was the mold underneath? Just need to make a funnel to conduct your molten load from the workcoil to your molds. Then you're in spheretown. Or turbineville. Whateveryouwantsburg.
*Though it did make a sweet, sweet puddle-sheet. Awesome vids, keep up the smooth work ;)
Could you melt something and then, while keeping it levitated, reduce power to solidify it into a smooth rounded shape?
The same field that levitates it is responsible for the heating. Hence the difficulties with keeping copper in the optimal spot. Maybe if you could flush the heat off with a gas flow while maintaining a field. Terribly Inefficient though. Casting Baby! It's not like smooth needs a sphere as perfect as those targets in the NIF. Though, such smoothness would be appropriate for him :)
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
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Posts: 1567
This is probably for Richie, but others can answer.
I want to try a software solution to automatically come down in frequency from above resonance at startup, and find the resonance point by tracking the phase relationships and magnitudes. THe software would bring the frequency down until the maximum is found, and then go up or down as needed to stay there.
My question is as follows: resonance can be seen when the inverter voltage and current are in phase, or the inverter voltage and tank capacitor voltage are 90 out of phase lagging. Which method is the best to stay at resonance? Follow inverter voltage and current, or follow inverter voltage and tank capacitor voltage?
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
> resonance can be seen when the inverter voltage and current are in phase, or the inverter voltage and tank capacitor voltage are 90 out of phase lagging. Which method is the best to stay at resonance? Follow inverter voltage and current, or follow inverter voltage and tank capacitor voltage?
For a simple series resonant LCR circuit the capacitor voltage lags the current by 90 degrees so the two methods you described are identical.
The choice comes down to convenience of implementation: Do you want to lock two things so that they are in phase, or lock two things so that they are in quadrature (at 90 degrees) ? I personally think the quadrature lock is easier to implement for several practical reasons.
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induction heating levetation
