Table of Contents
Magnetic path length
| Stan Zurek, Magnetic path length, Encyclopedia Magnetica, http://www.e-magnetica.pl/doku.php/magnetic_path_length |
Magnetic path length, path length or magnetic path, typically represented by the symbol $l$ for “length” 1)2)3) or MPL4) - 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. metres).
The concept of path length is used in calculations such as: deriving the value of magnetic field strength H from the magnetising current5) in a closed magnetic circuit6), magnetic reluctance7), effective permeability8), and many more.
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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)
S. Zurek, E-Magnetica.pl, CC-BY-4.0
Fig. 3. Gapped core with: magnetic path length in the core $l_{core}$ (blue) and length of air gap $l_{gap}$ (red)
S. Zurek, E-Magnetica.pl, CC-BY-4.0
See also
References
1),
5)
IEC 60404-2, Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of an Epstein frame
2)
IEC 60404-3, Methods of measurement of the magnetic properties of magnetic sheet and strip by means of a single sheet tester