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My Induction Boards / Coils/Inductors / Flux concentrators |
| Flux concentrators |
| Posted By: SATMOJ On 11/17/2006 08:54 am |
| just asking the question on what Flux concentrators you all are using. I have used Fluxtrol (green and red as well as the new pressed stuff) as well as steel laminations. What else is out there and what have you done with it? |
| Author | Message |
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T3sl4
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# Posted: 11/18/2006 11:53 pm
I've used chunks of ferrite rod (the kind you find in AM radios, 3/8" dia. 5" long) to heat stuff like copper pennies a bit better. I'd love to have a big chunk of ferrite, for electrical and heating reasons! Tim |
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SATMOJ
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# Posted: 11/20/2006 12:37 pm
Tim, I work next to a scarp yard. I have been collecting the Ferrite cores found on compute 100V cords. I intend to apply them to a coil just to see if they work simmilar to Fluxtrol or a Ferrotron flux concentrator.
As for a big chunk of ferrite. I may have some stuff laying around thats been charred on the edges. what exatly are you looking for? |
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SATMOJ
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# Posted: 11/20/2006 2:55 pm
errr ummmm COMPUTER 110 Volt cords. |
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T3sl4
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# Posted: 11/22/2006 10:40 am
You know the ferrite cores on the high voltage flyback transformer in TVs and well anything with a CRT? Something like that (or instead of a double "C" shape, an "E I" or double "E" shape would also do), but about 2-4 times bigger, would be nice to have for the heavier magnetics in my induction heater (filters, matching inductor, etc.). Or I could also convert the inverter to a skookum 10kW switching power supply.  Tim |
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Rob Goldstein
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# Posted: 02/08/2007 2:32 pm
Ferrites are used extensively in induction heating power supplying circuitry (chokes, transformers, etc.); however they have several limitations as it relates to their use on induction heating coils. First, there mechanical properties are not favorable at all. They are brittle, susceptible to thermal shock and very low machinable. The cost savings from low raw material costs are usually lost after taking into account machining. Besides the mechanical considerations, they have low saturation flux density and low Curie point. They do have some application in high volume (number of inductors) applications with simple shapes, high frequency, and low power density. The vast majority of induction heating applications utilizing flux controllers use either Fluxtrol/Ferrotron or iron silicon laminations. |
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T3sl4
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# Posted: 02/09/2007 6:06 pm
Silicon steel huh, at what frequency? Common transformer stock gets pretty glowy in my coil at 20kHz! Tim |
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Rob Goldstein
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# Posted: 02/10/2007 11:17 am
I agree Tim, they are extremely hard to work with. 20 kHz is getting to the upper end of where laminations can be used. IMO Fluxtrol and Ferrotron are a better way to go, especially above 10 kHz. Above 30 kHz, there's no questions at all. |
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SATMOJ
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# Posted: 02/23/2007 1:42 pm
Tim, I agree with Rob, I use their producs on a daily basis. you can't beat fluxtorol or ferrotron for convience and the higher end concentrators. however.. laminations win hands down for effeciency. I also purchace transformer steels at .001 and .003 and .007 thick for other aplications. What thickness steel were you using tim? the stuff in a 60 Cy transformer is usually about .025 thick and that does glow a pretty color. |
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T3sl4
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# Posted: 02/24/2007 12:59 pm
Indeed, it would have to be a good bit thinner than the stuff I have on hand. I think it's around 0.02, haven't measured it. Tim |
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jhodek
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# Posted: 03/31/2007 12:42 pm
Same results like Fluxtrol has SMP flux concentrator from Germany. I have great experince with this material. pepe |
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