Kärnlossresistansen

Kärnlossresistansen, meaning "coreless resistance" in Swedish, refers to a phenomenon observed in certain electrical components, particularly those with ferromagnetic cores, where a reduction in apparent resistance occurs under specific operating conditions. This effect is primarily associated with inductors and transformers.

The standard resistance of a component's winding is due to the material's resistivity. However, in devices with ferromagnetic cores, additional resistive losses can arise from factors like hysteresis and eddy currents within the core material. Kärnlossresistansen suggests that under certain frequencies or magnetic flux levels, these core losses, when measured or perceived as part of the overall impedance, might appear to decrease or behave in a way that deviates from a simple linear resistance model.

This phenomenon is not a reduction in the inherent conductivity of the wire itself, but rather a complex interplay of magnetic and electrical properties within the core and its interaction with the alternating current. It can be influenced by the core material's composition, the applied voltage and current waveforms, and the operating temperature. Understanding kärnlossresistansen is important for accurate modeling and design of inductive components, especially in applications involving high frequencies or demanding power handling. It highlights the need to consider non-linear behaviors in magnetic materials when analyzing circuit performance.