What is the function of transformer silicon steel sheet iron core?

Answer: The commonly used transformer core is silicon steel sheet. Silicon steel is a kind of steel containing silicon (silicon is also called silicon), and the silicon content is in. 0.8%~4.8%。 Silicon steel is used as the iron core of the transformer, because silicon steel itself is a magnetic substance with strong magnetic permeability, which can produce greater magnetic induction intensity in the energized coil, thus reducing the volume of the transformer. The power loss of transformer in AC state is not only on the resistance of coil, but also on the iron core magnetized by AC. Usually, the power loss in the iron core is called "iron loss", which 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 existence of hysteresis phenomenon in the magnetization process of iron core. The magnitude of this loss is proportional to the area surrounded by the hysteresis loop of the material. The hysteresis loop of silicon steel is narrow, and the hysteresis loss of iron core made of silicon steel is small, which can greatly reduce its heating degree. When the transformer works, the magnetic flux generated by alternating current in the coil is of course alternating. The changing magnetic flux produces an induced current in the iron core. The induced current generated in the iron core flows in the plane inner ring perpendicular to the T-shape in the same direction, so it is called eddy current eddy current loss, which also makes the iron core heat. In order to reduce the eddy current loss, the iron core of the transformer is stacked with mutually insulated silicon steel sheets, so that the thirsty flow in the long and narrow circuit passes through a smaller cross section to increase the electrical limit on the eddy current path; At the same time, silicon in silicon steel increases the resistivity of the material, and also plays a role in reducing eddy current. Generally, cold-rolled silicon steel sheets with a thickness of 0.35 mm are selected. According to the size of the required iron core, cut it into long pieces, and then overlap it into zigzag or zigzag. Theoretically speaking, the thinner the silicon steel sheet, the narrower the splicing strip and the better the effect. This reduces the eddy current loss, reduces the temperature rise, and saves the material of silicon steel sheet. However, in the actual production of silicon steel sheet iron core, it is not only from the above favorable factors, because it will greatly increase the working hours and reduce the effective section of R core. Therefore, when using silicon steel sheet to make transformer core, we should weigh the advantages and disadvantages from the specific situation and choose the best size.