luftkjernede

Luftkjernede refers to a type of electrical component, specifically an inductor, that uses an air core instead of a magnetic material core like iron or ferrite. This means the coil of wire is wound around a hollow cylinder or simply air itself. The primary characteristic of an air-cored inductor is its lack of a ferromagnetic core, which significantly impacts its properties.

Air-cored inductors are known for their low inductance values and are generally used in applications where precise inductance is needed or where the non-linear behavior of magnetic cores is undesirable. They exhibit a more linear relationship between current and magnetic flux compared to iron-cored inductors, meaning their inductance value remains relatively constant regardless of the current flowing through them. This linearity makes them suitable for high-frequency circuits, radio frequency applications, and resonant circuits where stable performance is crucial.

Due to the absence of a core material, air-cored inductors typically have lower inductance for a given size and number of turns compared to their ferromagnetic counterparts. They also tend to have lower resistance losses, especially at higher frequencies, as eddy currents are not induced in a core material. However, their magnetic field is less concentrated, meaning they can be more susceptible to external magnetic fields and can radiate their own magnetic field more readily. This makes shielding sometimes necessary in sensitive applications.