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Length of magnetic path?

Discussion in 'Electronic Design' started by amdx, Oct 27, 2006.

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  1. amdx

    amdx Guest

    I find the formula for the Reluctance of an air core solenoid as;

    Reluctance = (length / cross-section) x (1/mu)

    In the description length is just the length of the solenoid.
    Why wouldn't the length be equal to
    2 x the length plus some distance around both ends?
    This would seem to be the distance the lines of flux travel.

  2. Bob Eld

    Bob Eld Guest

    This assumes an infinitely long coil where the length is normalized unity
    length or some other convienient number that is a small fraction of the
    total. Per meter or per cm is usual. Indeed, in a short coil with defined
    ends, the path is much more complicated and there are emperical formulas to
    deal with it.
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