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IEVref:221-03-17ID:
Language:enStatus: Standard
Term: effective permeability
Synonym1:
Synonym2:
Synonym3:
Symbol: e
Definition: for a magnetic circuit constructed of different materials or non-homogeneous materials or both, the permeability of a hypothetical homogeneous material which, when used to construct a circuit of identical dimensions, would provide the same reluctance

NOTE 1 – Where the different materials are in series along the magnetic path and the permeability can be assumed constant over any cross-section, the following equation is applicable:

1 μ e l A = l μ r A MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaamaalaaabaGaaGymaaqaaiabeY7aTnaaBaaaleaaciGGLbaabeaaaaGccqGHris5daWcaaqaaiaadYgaaeaacaWGbbaaaiabg2da9iabggHiLpaalaaabaGaamiBaaqaaiabeY7aTnaaBaaaleaacaGGYbaabeaakiaadgeaaaaaaa@43AE@

where l is the length, measured along the magnetic path, of each part of the core of uniform cross-section A and homogeneous permeability r.

NOTE 2 – The effective permeability is used particularly in relation to cores having (air) gaps and it is usually restricted to cases where the leakage flux is relatively small.


Publication date:1990-10
Source:
Replaces:
Internal notes:2016-01-06: "may" corrected to "can". JGO

2017-06-02: Cleanup - Remove Attached Image 221-03-17.gif
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