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magnetic_path_length [2023/09/05 14:12] (current) stan_zurek
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 +====== Magnetic path length ======
  
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 +| //[[user/Stan Zurek]], Magnetic path length, Encyclopedia Magnetica//, \\ @PAGEL@  |
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 +**Magnetic path length**, **path length** or **magnetic path**, typically represented by the symbol $l$ for //"length"// [(Epstein_IEC>[[https://webstore.iec.ch/publication/2062|IEC 60404-2, Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame]])][(SST_IEC>[[https://webstore.iec.ch/publication/2068|IEC 60404-3, Methods of measurement of the magnetic properties of magnetic sheet and strip by means of a single sheet tester]])][(Ring_DC_ASTM>[[https://www.astm.org/Standards/A596.htm|ASTM A596 / A596M, Standard Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens]])] or //**MPL**//[(McLyman>[[https://books.google.co.uk/books?id=s_iMztIS8y4C&dq|W.T. McLyman, Transformer and Inductor Design Handbook, Marcel Dekker Inc, 2004, ISBN 0-8247-5393-3]])] - is the effective path taken by the [[magnetic flux]] in a [[magnetic core]] or [[magnetic circuit]]. The path is measured in the units of length (e.g. [[metre|metres]]).  
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 +The concept of path length is used in calculations such as: deriving the value of [[magnetic field strength|magnetic field strength H]] from the [[magnetising current]][(Epstein_IEC)] in a [[closed magnetic circuit]][(Ring_DC_ASTM)], [[magnetic reluctance]][(McLyman)], [[effective permeability]][(McLyman)], and many more.
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 +Fig. 1. Magnetic path in a [[magnetic core]]
 +[[file/magnetic_path_magnetica_png|{{magnetic_path_magnetica.png}}]]
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 +Fig. 2. [[Gapped core]] with: total [[magnetic path length]] $l$ (orange), length of core $l_{core}$ (blue) and length of [[air gap]] $l_g$ (red)
 +[[file/gapped_core_magnetica_jpg|{{gapped_core_magnetica.jpg}}]]
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 +Fig. 3. [[Gapped core]] with: [[magnetic path length]] in the core $l_{core}$ (blue) and length of air gap $l_{gap}$ (red)
 +[[file/magnetic_circuit_with_air_gap_magnetica_png|{{magnetic_circuit_with_air_gap_magnetica.png}}]]
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 +===== See also =====
 +  *[[Magnetic core]]
 +
 +===== References =====
 +~~REFNOTES~~
 +
 +{{tag> Magnetic_path_length MPL Counter}}

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