Kapton gapped PQ26/20 ferrite core

[Flyback]

Hi,
We have a transformer for a 2 tran forward. Its a PQ26/20 from ferroxcube.
The primary is 22 turns and 2.1mH. Suppose we kapton gap the cores. Then what would be the decrease in inductance do you think/guess?
(1 strip of kapton in the gap between the cores)

 

[ZipZapOuch]

Hi,
We have a transformer for a 2 tran forward. Its a PQ26/20 from ferroxcube.
The primary is 22 turns and 2.1mH. Suppose we kapton gap the cores. Then what would be the decrease in inductance do you think/guess?
(1 strip of kapton in the gap between the cores)

Somewhere between a tiny bit and a bit. It really depends on all the information you are not sharing. Did you know that Kapton tape is available in thicknesses besides the thickness in the roll you have on your desk, for example.

 

[ChrisP58]

Like most core manufacturers, Ferroxcube has a calculator to help you answer these type of questions. I haven't used theirs, but I'm assuming that it would give you some information.
https://www.ferroxcube.com/en-global/design_tool/index

I doubt that you can enter a gap length of "1 strip of kapton." You'll need an actual thickness number.

Or you could try measuring the gapped part.