Quick question about wire guage and inductance!!!

Discussion in 'The Projects Forum' started by bmxerds, Sep 20, 2012.

  1. bmxerds

    Thread Starter New Member

    Sep 4, 2012
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    0
    Hello everybody my question is what awg magnet wire should i use to wind a toroid. does wire resistance affect the toroid much. If i use a slightly larger gauge will it affect inductance?
     
  2. crutschow

    Expert

    Mar 14, 2008
    12,984
    3,223
    The wire gauge affects inductance only indirectly, since the wire size determines how many turns you can wind on a given toroid and, of course, inductance is proportional to the number of turns.
     
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  3. Austin Clark

    Member

    Dec 28, 2011
    409
    44
    Of course, wire gauge also affects resistance, effectively meaning you'll need higher voltage to get the same amount of current. That's the payoff for getting tighter coils (with more, and closer, turns).
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,090
    3,027
    Depending on frequency, DC resistance is a trivial contribution to impedance. For a DC coil, wire gauge and thus resistance matters a lot. For high frequency, inductance contributes far more to the total impedance.
     
  5. Austin Clark

    Member

    Dec 28, 2011
    409
    44
    Ah, great point. I hadn't even considered AC, I was thinking in terms of a coil-gun, or something similar. I guess the only thing I'd add to that is, resistance matters in determining waste heat.
     
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