Author Topic: Winding inductors  (Read 1018 times)

Offline Crankshaft

Winding inductors
« on: April 17, 2015, 08:43:59 AM »
Please help make sense of the following specs.  I would like to wind inductors to use on the Firstwatt F5 power supply
The part I don't get is the Inductor radius measurement.  Is this inner or outer?

These seem pretty huge, is there a more compact option? 


Value:  2mH

DC resistance 0.42 Ohms

Inductor height 0.88 Inches ( 22.31 mm)

Inductor radius 1.76 Inches ( 44.63 mm)

No. of turns 125

Wire diameter 0.058 Inches ( 1.48 mm) 15 AWG

Power 450 Watts

Wire length 132.0 feet ( 40.2 m)


Or am I just wasting my time and should just use the resistors.

Offline DRNB

Re: Winding inductors
« Reply #1 on: April 17, 2015, 09:41:04 AM »
Hi, its been a while since I've turned my own. So much easier to let someone do it for you. But if I read this correctly, it should be centre to centre.

http://www.66pacific.com/calculators/coil_calc.aspx

http://www.eeweb.com/toolbox/coil-inductance

"There is no shame in not knowing; the shame lies in not finding out." (Russian Proverb)

Offline chipwelder

Re: Winding inductors
« Reply #2 on: April 17, 2015, 10:57:37 AM »
They will be frigging huge, if they are supposed to carry lots of current... this is why people split some Transformers to make it up... but it might not help if you need lots of current
The 1.5mm wire will be huge... wire alone will be more than R500
OK! I've had it! I don't give anymore Kharma. Kharma should work in mysterious ways...

Offline Crankshaft

Re: Winding inductors
« Reply #3 on: April 17, 2015, 01:12:26 PM »
I just figured the radius measurement.

It's the inside of the coil - these are going to be large.




Offline chipwelder

Re: Winding inductors
« Reply #4 on: April 20, 2015, 07:24:36 PM »
Mine weigh about a kg each... or was it two kg's stupid noob spikka builders...
OK! I've had it! I don't give anymore Kharma. Kharma should work in mysterious ways...