DIY Inductor Winding

ak_47_boy · 3rd January 2007, 11:05 PM

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?
http://cgi.ebay.com/Digital-LCR-Capa...QQcmdZViewItem

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.

thanks

ak_47_boy · 8th January 2007, 01:19 AM

Anyone?

BWRX · 8th January 2007, 01:27 AM

What is the application?

Nordic · 8th January 2007, 06:39 AM

http://translate.google.com/translat...language_tools

You could build one of these.. I did and it works a charm, measures small caps too...

diegot · 8th January 2007, 12:20 PM

Nordic,
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.

ak_47_boy · 8th January 2007, 10:49 PM

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?

kmj · 9th January 2007, 10:20 AM

LC-meter at Apexjr.com
Just scroll down a bit.

radtech · 9th January 2007, 01:27 PM

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.

ak_47_boy · 12th January 2007, 01:03 AM

Its for 120V at around 30 or 40 amps.
http://www.geocities.com/jonrisch/surge.htm
Thats what its for.

ak_47_boy · 13th January 2007, 03:39 PM

?

3rd January 2007, 11:05 PM	#1
ak_47_boy diyAudio Member Join Date: Sep 2006	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? http://cgi.ebay.com/Digital-LCR-Capa...QQcmdZViewItem 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. thanks

8th January 2007, 01:27 AM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	What is the application? __________________ Brian

9th January 2007, 10:20 AM	#7
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	LC-meter at Apexjr.com Just scroll down a bit. __________________ .....Where the music comes to die.

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8th January 2007, 01:19 AM	#2
ak_47_boy diyAudio Member Join Date: Sep 2006	Anyone?

8th January 2007, 06:39 AM	#4
Nordic diyAudio Member Join Date: Sep 2005	http://translate.google.com/translat...language_tools You could build one of these.. I did and it works a charm, measures small caps too...

8th January 2007, 12:20 PM	#5
diegot diyAudio Member Join Date: Sep 2004 Location: Brazil	Nordic, 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.

8th January 2007, 10:49 PM	#6
ak_47_boy diyAudio Member Join Date: Sep 2006	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?

9th January 2007, 01:27 PM	#8
radtech diyAudio Member Join Date: Dec 2006	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.

12th January 2007, 01:03 AM	#9
ak_47_boy diyAudio Member Join Date: Sep 2006	Its for 120V at around 30 or 40 amps. http://www.geocities.com/jonrisch/surge.htm Thats what its for.

13th January 2007, 03:39 PM	#10
ak_47_boy diyAudio Member Join Date: Sep 2006	?

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