are ideal transformer with non-unity coupling coefficient same as non-ideal transform

Discussion in 'General Electronics Chat' started by zero_coke, Jan 30, 2013.

  1. zero_coke

    Thread Starter Active Member

    Apr 22, 2009
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    I'm just wondering if by modeling an ideal transformer with non-unity coupling coefficient is sufficient to model a non-ideal transformer. Is it possible to do this?
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
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    Probably not, the non-deal transformer has capacitance and resistance in its windings, where the ideal transformer won't. The non-unity coupling coefficient should only affect the inductance of the transformer...
     
  3. #12

    Expert

    Nov 30, 2010
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    #12 agrees.
     
  4. zero_coke

    Thread Starter Active Member

    Apr 22, 2009
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    But the resistance of my non-ideal transformer (two air core coils) is so small I can almost neglect it (0.2 ohms). And it doesn't have a core so there are no core losses. I'm just trying to model my air-core transformer with negligible resistance here, now in this case, can I do this with the ideal transformer having non-unity coupling coefficient?
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    An air core coil has low resistance AND low inductance, so the Q is affected by the resistance. Unfortunately though, skin effect probably affects it even more. You could calculate skin effect resistance, but I don't know if that would give you an accurate estimation of Q.
     
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