Inductance with an air gap

Discussion in 'General Electronics Chat' started by kender, May 8, 2007.

  1. kender

    Thread Starter Senior Member

    Jan 17, 2007
    263
    0
    Colleagues,

    I need to make a small-signal inductor with an air gap. The gap will vary from 0 to 1mm. The core material will be stainless steel. What could be the potential pitfalls?

    Cheers,
    Nick
     
  2. Johann

    Senior Member

    Nov 27, 2006
    190
    30
    Stainless steel is, to my knowledge, not a good choice for core material. Why do you want to use stainless steel?
     
  3. kender

    Thread Starter Senior Member

    Jan 17, 2007
    263
    0
    I’m expecting shorted-turn losses. The inductor is planned to be built on the surface of a thin (few mm) plate of Alloy 49 stainless steel. It’s not the worst stainless alloy from the magnetic standpoint.

    I’d be happy to use a ferrite pot core instead of stainless, but that would present at least 2 mechanical challenges:
    - The pot core should be low profile. Well, I could take a taller core and grind it down.
    - The top of the pot core should be coplanar to the surface of the stainless plate. Of course, the pot core could be ground together with the stainless plate. But I don’t have access to good grinding equipment to do this.

    At the moment I’d rather deal with magnetic challenges posed by the stainless steel rather than with these mechanical challenges.
     
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