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Potted cores...

Discussion in 'Electronic Design' started by Fred Bartoli, Aug 4, 2009.

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  1. Fred Bartoli

    Fred Bartoli Guest

    I have an app with 1% precision inductances (RM6 adjusted pot cores) and
    specified tempco.

    Now the customer wants all that potted.

    I never had experience with this, but I recall having seen reported here
    some bad stories about potting cores, IIRC something about potting
    preventing core volume magnetostriction, hence modifying its permeability...

    Any story, good or bad, about this?

  2. Do not use a hard set potting compound. ONLY use RTV, or polyurethane
    or the like, OR you must vacuum impregnate the finished inductors with
    varnish to keep the potting medium from getting into places within the
    assembly that cause issues like that you describe. Impregnation is always
    a good thing anyway to lock such a device within a known window of
  3. Fred Bartoli

    Fred Bartoli Guest

    Son of a Sea Cook a écrit :
    Well, the cores are already varnished (vacuum impregnated).
    But I'm still anticipating some issues. Some grossly out of tolerance
    measurements on a complementary product make me cautious. Unfortunately
    I'm not allowed to "open" it and I have no info about the internals.

    I've once seen mentioned use of some soft "strain shielding" material
    before potting.

    Still looking for good stories to convince the customer to spare a few
    days investigating this...
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