Can I replace this custom made 2-phase filter inductor with plain thoroids ?

[erikbrenn]

Hi,

I'm repairing a ventilation system that has a damaged custom made 2-phase mains filter. I contacted the manufacturer and they told me it is a custom job for the ventilation manufacturer, they did not stock it. And the ventilation manufacturer charges an arm and a leg for it.

Each inductor in the original filter is 128uH. 

Would it be ok to replace such a filter with two thoroid chokes each of 128uH inductance?  What is the reason they use such a combined filter with the two phases around a iron core instead of just using two chokes?  How does combing two such inductors in one unit change the magnetics/inductance?

Original filter


Considering replacing it with two of these inside a 3d-printed housing.

[langwadt]

https://en.wikipedia.org/wiki/Choke_(electronics)#Common-mode_choke

[fzabkar]

128uH seems very low. I would expect that should be millihenries.

Perhaps you could use a 1:1 isolation transformer (with correct phasing)?

https://www.ebay.com.au/itm/353075366503

[jdragoset]

Since it is EI iron core, Drill rivets, Remove core, Cut Mylar tape, Unwind, Counting turns and direction, Rewind with same size enameled wire and Mylar tape.

[jonpaul]

easy to remove clamp, varnish, check gap and wdgs for short/open.

Get same wire, rewind, reassembele


Jon

[wasedadoc]

Hi,

I'm repairing a ventilation system that has a damaged custom made 2-phase mains filter. I contacted the manufacturer and they told me it is a custom job for the ventilation manufacturer, they did not stock it. And the ventilation manufacturer charges an arm and a leg for it.

Each inductor in the original filter is 128uH. 

Would it be ok to replace such a filter with two thoroid chokes each of 128uH inductance?  What is the reason they use such a combined filter with the two phases around a iron core instead of just using two chokes?  How does combing two such inductors in one unit change the magnetics/inductance?

Original filter


Considering replacing it with two of these inside a 3d-printed housing.

You need to learn about common mode chokes. You cannot emulate one with two uncoupled windings.

https://www.coilcraft.com/en-us/edu/series/a-guide-to-understanding-common-mode-chokes/

And it is not "2 phase".

[erikbrenn]

Somewhat late response here, but thanks for the replies.  I dunno what I was thinking, I simply didn't think this was a common mode choke as I have never seen one like this.
The component is faulty, which probably explains its low inductance for its size...  It has burnmarks and is likely shorted
I bit the bullet av ordered a new one for two hundred bucks

> And it is not "2 phase".

yes, I realize that now