calculator:effective_permeability_from_air_gap
Calculator of effective magnetic permeability from air gap
 | Stan Zurek, Calculator of effective magnetic permeability from air gap, Encyclopedia Magnetica, https://www.e-magnetica.pl/doku.php/calculator/effective_permeability_from_air_gap, {accessed: 2025-03-13} |
For a magnetic circuit with uniform cross-section the value of effective permeability μeff can be calculated if the lengths and permeabilities of both parts are known.
| Effective magnetic permeability μeff | ||
|---|---|---|
| Source: [1[ Colonel Wm. T. McLyman, Transformer and inductor design handbook, 3rd ed., Marcel Dekker, New York, 2004, ISBN 0824753933 | ||
| [1] eq. (1.25), chapter 1 | $$ μ_{eff} = \frac{μ_{core}}{ 1 + μ_{core} ⋅ l_{gap} / l_{core} } $$ | (unitless) |
| where: $μ_{core}$ - relative permeability (unitless) of magnetic core, $l_{gap}$ - length of air gap (m), $l_{core}$ - length of magnetic core (m) along the magnetic path | ||
Note: The equation is valid only for a simple magnetic circuit, with cross-sectional area of the core and gap being equal, for relative permeability if lcore » lgap, and if µcore » 1.
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calculator/effective_permeability_from_air_gap.txt · Last modified: 2025/01/18 21:47 by stan_zurek