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#289
 
03-21-2011, 06:28 AM
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| G'day peepz!  Once again i've been bitten by the IH bug so heresmy latest project:  YouTube - Induction heater owns nutYes its a mess but thats gonna change soon.  |
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#290
03-21-2011, 12:18 PM
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| looks good. seems to work well also. one thing. move the off switch close to the machine! if there was an emergency you have to run half way across the house to turn it off! i just dont want to see you melt your foot off with some molten metal.  |
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#292
05-01-2011, 10:03 AM
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Siamon99 |
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#293
12-27-2011, 02:24 PM
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| My new work Last edited by chistyakov1971; 12-27-2011 at 02:45 PM. |
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#294
04-11-2012, 08:59 PM
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| Anyone happen to know how to size a work coil? I am working on building a 10kW Induction heater to primarily melt aluminum and sometimes what ever else I have on hand. Cast iron would be nice but I know that will be a stretch for it. Anyway looking at a 16lb batch size using a 7" max OD x 8.5" tall crucible so that puts the ID of my coil at 7.5" to 8" but the real question is how many turns should I aim for? Once I know how many turns to aim for I can set up the rest of the tank circuit. For a inverter I am using a full bridge IGBT output stage coupled into a Ferrite 20 to 1 transformer. Max input voltage will be 240Vac with 50A of available current (single phase full wave rectified so ~340V peek) at ~65kHz switching rate. Long term will have a input buck converter to control DC voltage but will just start with a Variac I have sitting around. The tank circuit is currently set up for series LC. Full setup (including IGBTs and tank cap) will be water cooled. So is there any formulas that will let you calculate the correct # of turns to get the maxim amount of power into a 8" diameter pot of metal? Thanks. |
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#295
04-13-2012, 09:14 AM
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| Hi Wireb, the coil turns will depend on workpiece height( pot's height), cooper tubing diameter used,desired frecuency( inductance related with coil geometrical parameters),you can use less turns with more current or more turns with less currrent to obtain the same result. is not easy to calcullate the optimal number of turns is a compromise between above parameters. regards, Hernan |
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#296
04-13-2012, 10:06 AM
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| Thanks for the reply. Is there any general formulas that will get me close to the inductance of a coil based on tubing diameter, # of turns, and diameter and any other physical dimensions? I know this will not be exact but would like to try and get a rough idea what size coil I should shoot for. Few more details I just got a pair of 3.75uF snubber caps for the tank (conduction cooled). So that gives me choices of 1.875, 3.75, 7.5uF (7.5uF will have the highest current handling and 1.875 will have the lowest) |
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#297
04-13-2012, 01:32 PM
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| Wireb, the formula used in some literature: L coil(uHy)= (r X N)/(9r +10h) where: L coil's inductance r: is the radius of de coil N: number of turns h: height of the coil Hernan |
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