Hanna curve
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Hanna_curve_by_Zureks.svg/320px-Hanna_curve_by_Zureks.svg.png)
Hanna curve - a curve defining magnetic parameters of an inductor. [1]
Hanna curves help in finding optimum working conditions (maximum energy stored in an air gap) for an inductor. Several parameters are taken into account, including: magnetic field or flux density level, size of an air gap, physical dimensions of the magnetic core, number of turns of the winding, etc.[2]