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