Author Topic: Induction cooker without electronics  (Read 1040 times)

Offline Solhi

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Re: Induction cooker without electronics
« Reply #20 on: November 24, 2022, 01:45:33 AM »
I found out it is easier to work back from how much μT I need than just trying to get some output from coil, since it is the strength of electromagnetic pulse that do the work, not how much energy the coil consumes.
I found the standard (27 μT) which is used, but it seems that that is when a vessel covers the induction area. This does not tell anything about how much is needed to heat the vessel satisfactory to get reasonable cooking time. So to solve that first, should I just calculate back in a form of KW needed => A/turn times amount of turns used?

Edit: calculation A/t solved = 50 A.
My coil at the moment emits theoretical 650 μT. TBPC should then double that.

Trying to find a conversion from μT to energy, unless somebody can confirm that total A/t = Ampere.
« Last Edit: November 25, 2022, 07:41:20 AM by Solhi »

Offline Solhi

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Re: Induction cooker without electronics
« Reply #21 on: November 24, 2022, 08:08:48 AM »
I found following in
https://www.bfs.de/EN/topics/emf/lff/application/induction-hob/induction-hob_node.html

Basic threshold values
− Low-frequency fields at 50 Hz: current density of 2 mA/m2
− Medium-frequency fields: the permissible current density depends on the frequency and ranges from 50 mA/m2 at 25 kHz to 140 mA/m2 at 70 kHz.

Reference values
− Low-frequency magnetic field: 100 µT
− Medium-frequency magnetic field: 6.25 µT

Again not knowing if that is the maximum allowed magnetic power.

Further I am confused about the input on this site: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html

Do I really input the amps from the sim times the windings as the A for the calculator?
« Last Edit: November 24, 2022, 08:10:55 AM by Solhi »

Offline Solhi

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Re: Induction cooker without electronics
« Reply #22 on: November 25, 2022, 07:53:52 AM »
The A/t issue is solved, answer is indeed.
This gives me a theoretical magnet field of 650 μT at 40 kHz.
Since this is a TBPC that number should double.

All the references I found before, about legal magnetic fields, were all related to exposure during use.

I need only to find a conversion from μT to energy, unless anybody can confirm that A/t = amperes.

Offline Solhi

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Re: Induction cooker without electronics
« Reply #23 on: November 25, 2022, 12:05:50 PM »
How did you model the bifilar pancake coil?
Suppose we think of it as two windings occupying nearly the same space, so tightly coupled, each with inductance L.
A model with two identical L's in series, for total of 2L, is wrong.
If the inside of one coil connects to outside of the other coil, the combination gives you 4L. (Realizable in simulation by drawing two identical L's and setting a coupling factor of 1 or 0.999.)

Can not define coupling between 2 independent coils. So I keep it as is only to get an indication of power in use. Then double it to simulate a TBPC.
I have no idea if, how far off I am.

Re sim:
Quote
"I want to see if they represent electron drift direction (bad) or direction of charge transport (good) or user gets to choose (even better)."

Not been able to find out, though I  guess it is the electron drift.

@klugesmith, I hope you can guide me more since I feel I'm stuck now.

Until now I have concluded this:
My TBPC is by feeding it with 24 V AC in it's resonant frequency 40 kHz, producing a magnetic field of 1300 μT.

Even in my search to convert that to KW and finding a site that probably solves it. I have for now problems in calculating a result.
The site:
https://pressbooks.bccampus.ca/introductorygeneralphysics2phys1207/chapter/24-4-energy-in-electromagnetic-waves/

If I can round off this satisfactory, then it looks like I am close to the intend of this thead.
« Last Edit: Today at 05:48:04 AM by Solhi »

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Re: Induction cooker without electronics
« Reply #23 on: November 25, 2022, 12:05:50 PM »

 


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