rautasydänkelat

Rautasydänkelat, also known as iron core coils, are inductors that utilize a core made of ferromagnetic material, most commonly iron or an iron alloy. This iron core significantly increases the magnetic permeability of the inductor compared to an air core. This higher permeability allows the coil to store more magnetic energy for a given current and number of turns. The primary function of a rautasydänkelä is to oppose changes in electric current due to the magnetic field generated by the current itself.

The inductance of a rautasydänkelä is determined by factors such as the number of turns in the coil, the cross-sectional area of the core, the length of the magnetic path, and the permeability of the core material. Iron cores are typically used in applications where a high inductance value is required in a relatively small physical size. This makes them suitable for use in power supplies, filters, transformers, and various electronic circuits where energy storage or impedance matching is necessary.

However, iron cores are not without their drawbacks. At high frequencies, they can introduce losses due to hysteresis and eddy currents within the iron. These losses can reduce the efficiency of the circuit and generate heat. Therefore, the choice between an iron core and other core materials like ferrite or air depends on the specific operating frequency and performance requirements of the application. Rautasydänkelat are generally more susceptible to saturation than air core inductors, meaning their inductance can decrease significantly if the magnetic field strength becomes too high.