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Author Topic: Induction Heating - Let's discuss  (Read 5466 times)
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Ichan
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« on: January 11, 2008, 06:31:45 18:31 »

Hi, I'm inviting people to discuss about this one, Induction Heating - high power, high frequency, must be a challenging project.

As a start point from me, there is a good ebook on the net:

Optimal Control of Induction Heating Processes (Dekker Mechanical Engineering)
Publisher: CRC | 2006-07-07 | ISBN 0849337542 | Pages: 349 | PDF

http://rapidshare.com/files/79127336/Optimal_Control_of_Induction_Heating_Processes.rar

http://www.filefactory.com/file/06ab96/

Please feel free to add anything related, this mean to be an open discussion.


Regards, Ichan.

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microtest
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« Reply #1 on: January 13, 2008, 03:03:48 03:03 »

did you have made a induction furnace with power fet or igbt o scr i like to do it too
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Ichan
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« Reply #2 on: January 13, 2008, 02:49:50 14:49 »

No, i haven't build any induction heating system.

I am very interested with this one as it will have a lot of industrial applications, here i asked people to learn together.

Regrads, Ichan.
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Devil_electric
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« Reply #3 on: January 14, 2008, 12:31:42 00:31 »

I have to build Inverter Welding, High power and high frequency

So I have a little problem in english, I can read I can understand, But I write not well

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looser
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« Reply #4 on: January 14, 2008, 01:31:09 13:31 »

Devil Electric

Would you mind if you let us be informed about your welding.  It is truely will shorten the inductive heating idea. Than you may produce another welder but for the secondary side we may combine the inductive load section.

Regards..
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Devil_electric
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« Reply #5 on: January 14, 2008, 03:18:35 15:18 »

So in main Power circuit I use Zero voltage Full bridge Phase shift controller such as
UNITRODE UC3879 or another in same series

and control feedback current to control constant current that welding wanted

ar...... about 100-250A

I think in power stage of Induction Heating is the same of inverter welding....

Regards.....
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Malcolm
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« Reply #6 on: January 14, 2008, 03:38:29 15:38 »

Hi Devil Electric,
 I also developed an EDM (Hi Power_Variable frequency) power supply with zero-crossing detecetor fed to to a fast switching power amp.
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Devil_electric
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« Reply #7 on: January 14, 2008, 03:59:04 15:59 »

Hi Malcolm

In the inverter welding that have variable frequency too, Because it can adjust wide caplibily load range, So (in the inverter welding that have load output 0-30Volt and current can adjust minimum 30-120A)

So,  I use VCO to control switching frequency

Regards.....
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Ichan
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« Reply #8 on: January 14, 2008, 05:14:55 17:14 »

Greetings Friends,

I think any electronic application with high power - high frequency still related to the topic, all welcome!

For now maybe we can share informations, links, pictures, schematics, etc that we have, let me started.

First, I found many IEEE transaction paper about induction heating on http://www.edaboard.com/, too many to make me confuse wich one to read  Grin

Second, here is the link for Home Built Arc Welder using Microwave oven transformer, not an inverter one.
http://www.dansworkshop.com/Homebuilt%20arc%20welder.shtml


Third, an internal picture of an Inverter Welder (how can it be so complex?).
http://www.geocities.com/ftpspace1/welding/Millerxmt304/xmt.htm


Fourth, someone post his own schematic of SWITCH MODE ARC INVERTER WELDER SCHEMATIC on edaboard.
http://www.edaboard.com/ftopic156755.html

Malcolm, an EDM? Whew.. share with us please...

Regards, Ichan.
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microtest
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« Reply #9 on: January 15, 2008, 07:19:39 19:19 »

we can made the schematic 1st and  and simulation is more easy  the induction heating can be controled by a DSPIC30F2023 and it can control from cooking at kitchen to 1Mwatt for steel or any metal at shop only we need tu select the coil we need to do
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Ichan
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« Reply #10 on: January 15, 2008, 09:38:42 21:38 »

Ok, would you please put some more description of your idea? A drawing maybe?

Regards, Ichan.
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Devil_electric
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« Reply #11 on: January 16, 2008, 12:12:51 00:12 »

ar...... for induction heating

Where i can find the COIL?
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looser
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« Reply #12 on: January 16, 2008, 09:57:50 09:57 »

Devil electric

Below the web will give you a quite a coil info.

http://www.stanleyzinn.com/index.html

Depending on your power you may need to cool your work coil. The simplest and the efficient I can tell you is to use a quarter inch (6mm) copper tubing and pass  cooling water through.
Copper is soft enough and you can give any form by hand.

Ichan.
http://www.edaboard.com/ftopic156755.html  the address you provided asking for credit to see the info. If you already have it could you please post it via miht or something similar.

regards.
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Ichan
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« Reply #13 on: January 16, 2008, 05:37:25 17:37 »

A very nice article on coil, thanks.

The file from edaboard:

http://mihd.net/8zlso2


Regards, Ichan.
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looser
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« Reply #14 on: January 17, 2008, 12:56:11 12:56 »

You guys better if you visit the web page and click the induction section. You will learn and love much.

http://www.richieburnett.co.uk/tesla.shtml
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Devil_electric
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« Reply #15 on: January 18, 2008, 12:50:55 00:50 »

Hi all

For high power application such induction heating

What instrument that you use for research, Please recommended any instrument or testing equipment that its suitable....

Regard
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Ichan
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« Reply #16 on: January 19, 2008, 06:34:23 18:34 »

An Oscilloscope must be important, because of the induction heating is a resonant system then it will need to be "tuned" to it's resonant frequency. Here is an oscilloscope will play an important role, and i dont have any..  Huh

Regards, Ichan.
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Devil_electric
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« Reply #17 on: January 21, 2008, 11:44:39 11:44 »

For my Lab

Research on Power electronic

I have Digital oscilloscope
I have Logic analyzer
I have Electronic load Chrama 4KW
I have DC Source 3KW Lambda
So I have all basic equipment

But I don't have Current probe

Its very expensive for measure large current (>100A), (Textronic current probe)

Did anyone recomenened a cheapper Current probe

Regard
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looser
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« Reply #18 on: January 21, 2008, 01:33:50 13:33 »

Devil electric
You intend to measure AC currens only?
Simple hand held clamp meter can measure couple of hundret Amps and cost 30--100 dollar region.
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Ichan
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« Reply #19 on: January 21, 2008, 04:53:44 16:53 »

Ah.. Devil you make jealous..  Grin

Is all the Rice Cooker use Induction Heater? I think it will be good to learn from the bottom by opening the Rice Cooker in the kitchen, just don't tell the lady of course!

Regards, Ichan.
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ravenfeather
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« Reply #20 on: April 16, 2008, 08:44:22 20:44 »

Don't forget that efficiency of the induction heater depends on the properties of the materials ( electrical , magnetic). So if one frequency is good for heating iron the same may not be good for heating coper. There is some software products for modeling ( based on finite element methods line ANSYS,COSMOS etc.) that calculates the distribution of magnetic field and temperature inside the body.

Posted on: April 13, 2008, 07:25:18 19:25 - Automerged

Here is one useful book

"Handbook of Induction heating"
http://rapidshare.com/files/108024628/HIH.pdf.html
Good luck Smiley
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Walkura
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« Reply #21 on: April 20, 2008, 07:27:18 07:27 »

Some time ago i seen an evaluation board from st for a induction cooker .
Its with the st7 serie of procesors but thats easy to change .
Here is the link to the datasheet with the schematic and software .
http://www.st.com/mcu/download2.php?file=12443.pdf&info=AN2383%20from%20AN%20Finder&url=http://www.st.com/stonline/products/literature/an/12443.pdf
I hope this information is usefull for you .

Have a nice day .
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tuvoj
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« Reply #22 on: April 30, 2008, 09:18:05 09:18 »

For experimenting, you could start by ripping a unit from a used/junked commercial oven top (the ones from GE come to mind).

They have 1500-5000 W induction modules built into the oven tops on the models using CERAM one-piece top burners....

Cheers-Tuvo
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