inductance estimation

Discussion in 'General Electronics Chat' started by darsie, Feb 20, 2010.

  1. darsie

    Thread Starter New Member

    Feb 19, 2010
    15
    0
    Hi!

    Does the inductance of a coil on a closed core (ring core, EI-, EE-, UI-, UU-core) depend on the length of the coil? I guess not, because the magnetic length is the same.

    Does it depend on the coil area if the core is the same? I guess not much since the additional area is an air core.

    How different are inductors with straight and closed cores of equal length?
     
  2. Duane P Wetick

    Active Member

    Apr 23, 2009
    408
    19
    See Inductance Calculations by Frederick W. Grover, ISBN 9780876645574 or 9780486474403, 1948 & 2004 editions for a full treatise on the subject.

    Cheers, DPW [ Everything has limitations...and I hate limitations.]
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    L=N^2/S

    S=l/μ*A

    where

    L=inductance
    N=number of turns
    S=reluctacne
    l=core length
    μ=permeability of the core
    A=cross sectional area of the core

    The inductance depends on the length and the cross sectional area of the core. If the windings are not tightly winded then you have to include the air gap in your calculations.
     
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