![]() ![]() ![]() This reduces the effective permeability from over 1000 to around 137 (see also the calculator of effective permeability).įor smaller gaps the influence of the core is increased and the tolerance could be as wide as ☒5%. In the example above 150 μm is a relatively large value for the magnetic path of the core, which is 19 mm. The tight tolerance of ☓% is possible to attain for proportionally larger gaps. For the core ER14.5-3-7 this is synonymous with an air gap of 150 μm. Therefore, if the manufacturer provides the A L this simplifies the calculations.Ī typical notation A L=160 nH ☓% means that the core is gapped with such an air gap that A L = 160 nH (per square turn). VL Voltage induced in the coil in Volt di/dt change of current through the coil in Ampere per second. L VL/ (di/dt) Where: L the inductance of the coil in Henry (H). And by comparing the equations it can be seen that the value $x = A_L$ and it is a constant for a given magnetic core of fixed parameters, as long as the effective magnetic permeability is not affected (e.g. Inductance: L The inductance of a coil is the property which describes the relation between the voltage induced in a coil, and the change of current through the coil.
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