Hi! I'm looking for a 30mH coil for a use in a conjugate. I noted on Erse's website that they do make such a beast (even as an air coil) but I cannot find them readily at their distributors. I assume this would be a custom order item. Does anyone have any experience ordering this type of item from one of their distributors? Any other recommendations?
Source for large (30mH+) inductors?
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For something that large you might want to look at building your own. Someone on here posted a message to Jon about having some left over 10ga wire but I cant remember who it was. Maybe someone else will chime in and know who it was. If you can get the wire there are several online calculators you can use to get the # of turns.I am not Dawaro the muslim state in Ethiopia...Just DAvid WAyne ROberts- Bottom
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Originally posted by dawaroFor something that large you might want to look at building your own. Someone on here posted a message to Jon about having some left over 10ga wire but I cant remember who it was. Maybe someone else will chime in and know who it was. If you can get the wire there are several online calculators you can use to get the # of turns.
We had made these giant coils for a magnetic field test, out of 10ga magnet wire. They are about 70-90mH each, I forget now. About 18" in dia, about 3" thick as well as wide, just the winding part, they're on heavy wooden spools. I posted pics for the full joke effect... Haven't weighed them, but I'd guess the pair weigh 50-60lbs or more. And, we have about half a spool of unused wire left!!! 8O
Anyway, are you thinking about iron cores yet?? :rofl:- Bottom
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yeah, I'm thinking I'll need an iron core. Funny that Erse lists them on their website, but none of their distributors will special order them for me. Probably the cheapest one would be:
IXQ Xtreme Laminated I-Core Coil
ELC55-20-30000
20 Ga.
30.00 mH
2.202 Ω
Any good sources for cores?- Bottom
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MarcE, did you check the "zero-ohm-coils" at the Mundorf site?
You mentioned 2.2ohm for a 30mH coil... can you live with that resistance?
Hysteresis distortion depends on type of core and material.
Inudctive reactance = inductance and that depends on how big the coil (diameter, number of turns and layers) is and if it is an air coil or iron cored coil.
/Peter- Bottom
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Like Jed said, you can just add inductors in series for equivalent inductance. Just make sure you take care with the placement of the inductors; normal rules apply.-Tyler
Under deadline pressure for the next week. If you want something, it can wait. Unless it's blind screaming paroxysmally hedonistic...- Bottom
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One should be aware though that two coils in series will give higher resistance than a single coil with the same inductance.
Also what is "normal rules" when it comes to placement of coils? In a crossover where you may wish to minimize coupling between parts of the crossover you need to separate the coils by some distance and angle them 90degrees from eachother. When you seek to maximise inductance for a given length of wire in two coils you want the opposite.
/Peter- Bottom
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considering the size (30mH) and if it must be a steel cored one, go
for the mundorf for a better lamination process and material.
And for me considering you may have to order direct from Germany,
go for the adjustable coil setup (google for the 2006 catalog/prices where
there's pictures of the thing.2007 catalog doesn't show them) available for round or even flat coil wire.
I almost ordered those setup too.But still holding it back as i'm more
interested in a series coil configuration (say 15mh+15mh but on a single core) but adjustable!
It would be great if mundorf could make them for me.We'll see.Haven't
pushed them those disturbing email yet.- Bottom
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Originally posted by PiotrOne should be aware though that two coils in series will give higher resistance than a single coil with the same inductance.
/Peter- Bottom
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Originally posted by 69StingrayIf you have two 15 mH coils, each with 0.50 DCR, then in series, you have a 30 mH coil with 1.0 DCR? Correct?- Bottom
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Also what is "normal rules" when it comes to placement of coils? In a crossover where you may wish to minimize coupling between parts of the crossover you need to separate the coils by some distance and angle them 90degrees from eachother. When you seek to maximise inductance for a given length of wire in two coils you want the opposite.-Tyler
Under deadline pressure for the next week. If you want something, it can wait. Unless it's blind screaming paroxysmally hedonistic...- Bottom
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