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IEVref: | 221-03-17 | ID: | |

Language: | en | Status: Standard | |

Term: | effective permeability | ||

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Symbol: | µ_{e}
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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: $\frac{1}{{\mu}_{\text{e}}}\sum \frac{l}{A}=\sum \frac{l}{{\mu}_{\text{r}}A}$
where 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 | ||

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