In daily life, we can see that the transformer on the transformer platform is different from the conventional electronic equipment, but also as a transformer electronic component, the single-phase transformer core EI lamination is used on the transformer platform, that is, silicon steel sheet. . Silicon steel is a silicon-containing steel with a silicon content of 0.8 to 4.8%. The core of the transformer made of silicon steel is because silicon steel itself is a magnetic material with strong magnetic permeability. In the energized coil, it can generate a large magnetic induction, which can reduce the size of the transformer. Commonly used single-phase transformer core EI laminations are generally made of silicon steel sheets.
We know that the actual transformer always works in the AC state, and the power loss is not only in the resistance of the coil but also in the core under the alternating current magnetization. Usually, the power loss in the single-phase transformer core EI lamination is called "iron loss", and the iron loss is caused by two reasons, one is "hysteresis loss" and the other is "eddy current loss".
Hysteresis loss is the iron loss caused by the hysteresis phenomenon in the magnetization process of the iron core. The magnitude of this loss is proportional to the area enclosed by the hysteresis loop of the material. The hysteresis loop of silicon steel is narrow, and the core hysteresis loss of the transformer is small, which can greatly reduce the degree of heat generation.
When the transformer is working, there is an alternating current in the coil, and the magnetic flux it generates is of course alternating. This varying magnetic flux produces an induced current in the core. The induced current generated in the lamination of the single-phase transformer core EI is circulated in a plane perpendicular to the direction of the magnetic flux, and the core of the transformer is laminated with silicon steel sheets insulated from each other, so that the eddy current is in the narrow-shaped loop, and the passage is small. The cross section is to increase the resistance of the eddy current path; at the same time, the silicon in the silicon steel increases the resistivity of the material and also acts to reduce the eddy current.http://www.chenglion.com/