pyörrevirtihäviöihin

Pyörrevirtahäviöt, also known as eddy current losses, are a type of energy loss that occurs in conductive materials when they are subjected to a changing magnetic field. This phenomenon is particularly relevant in electrical engineering, especially in devices like transformers, motors, and generators.

When a conductive material, such as the iron core of a transformer, is exposed to a fluctuating magnetic flux, an electromotive force (EMF) is induced within the material itself. This induced EMF causes circulating currents, known as eddy currents, to flow within the conductor. These eddy currents encounter electrical resistance in the material, leading to the dissipation of energy as heat. This heat represents a loss of useful electrical energy.

The magnitude of pyörrevirtahäviöt is influenced by several factors, including the strength of the magnetic field, the frequency of the field's change, the electrical conductivity of the material, and the resistivity of the material. Thicker conductors and higher frequencies generally result in greater eddy current losses.

To mitigate these losses, engineers employ various techniques. One common method is to laminate the conductive cores. This involves dividing the core into thin, insulated sheets. The insulation between the laminations increases the overall resistance to the flow of eddy currents, thereby significantly reducing their magnitude and the associated energy losses. Another approach is to use materials with higher electrical resistivity.