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Old 3rd January 2007, 11:05 PM   #1
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Default DIY Inductor Winding

I need a 4000watt 100uH powdered iron rod core or ferrite inductor. I don't think i am going to be able to buy these.
I guess what i will do is wind 10awg magnet wire round a powdered iron rod core or a ferrite core and measure the inductance till i get 100uH. Questions:

1. I need a meter that mesures inductance, is this ok?

2. Approximatly how big should the core be? Where do i get a core? Can i just use any old solid iron round stock?

3. What pattern should i wind? One layer, bobin style?

btw it needs to be low resistance, like 0.08ohms.

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Old 8th January 2007, 01:19 AM   #2
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Old 8th January 2007, 01:27 AM   #3
BWRX is online now BWRX  United States
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What is the application?
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Old 8th January 2007, 06:39 AM   #4
Nordic is offline Nordic  South Africa
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You could build one of these.. I did and it works a charm, measures small caps too...

Click the image to open in full size.
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Old 8th January 2007, 12:20 PM   #5
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I had built a LC meter with a PCB made by me. But it didn't worked. Now I will try this one.
Thanks for de link.
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Old 8th January 2007, 10:49 PM   #6
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Its for a large power filter, large.
I don't mind buying a meter, i will likely use it alot. Am i fine with a handheld?
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Old 9th January 2007, 10:20 AM   #7
kmj is offline kmj  Sweden
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LC-meter at
Just scroll down a bit.
.....Where the music comes to die.
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Old 9th January 2007, 01:27 PM   #8
radtech is offline radtech  United States
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Perhaps it would help to specify the exact requirements, 4000watts doesn't tell us much (you don't really want an inductor that dissipates 4000W do you?). "Large" is pretty ambiguous as well.. even assuming it's a 4000W supply is it 4 volts at 1000 amps, 4000 volts at 1 amp? Both would be 4000W but would require quite different inductors.
So, what current and voltage are we talking?

Depending on what you actually need, there may be something commercially available. Otherwise, you'll need to figure the right wire size for the current, make sure the insulation will handle the voltage, and then find some way to calculate at least roughly how many turns you'll need for a particular core. Measuring as you go will be tricky, where do you make your meter connections, scape off some insulation every few turns? That wouldn't be very acceptable. I'd think your best bet would be to wind enough to be sure you're past 100uH, then carefully trim off bits to work back down to that value.
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Old 12th January 2007, 01:03 AM   #9
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Its for 120V at around 30 or 40 amps.
Thats what its for.
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Old 13th January 2007, 03:39 PM   #10
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