The commonly used transformer cores are usually made of silicon steel sheets. Silicon steel is a type of steel made of silicon (also known as silicon), with a silicon content ranging from 0.8% to 4.8%. The iron core of a transformer is made of silicon steel because silicon steel itself is a magnetic substance with strong magnetic conductivity. In the energized coil, it can generate a large magnetic induction intensity, which can then reduce the volume of the transformer.

We know that actual transformers always work in a communication state, and power loss occurs not only in the resistance of the coil, but also in the iron core under alternating current magnetization. The power loss in the iron core is usually referred to as "iron loss", which is caused by two reasons: hysteresis loss and eddy current loss.

Hysteresis loss is the iron loss that occurs during the magnetization process of an iron core due to the presence of hysteresis. The magnitude of this loss is proportional to the area enclosed by the hysteresis loop of the data. The hysteresis loop of silicon steel is narrow, and using it as the iron core of transformers has smaller hysteresis losses, which can greatly reduce its heat generation.

Since silicon steel has the above advantages, why doesn't the oil cylinder need to use a whole piece of silicon steel as the iron core, but rather process it into sheet shape?

This is because the sheet-like iron core can reduce another type of iron loss - "eddy current loss". When a transformer is working, there is alternating current in the coil, and the magnetic flux it generates is of course alternating. The changing magnetic flux induces current in the iron core. The induced current that occurs in the iron core flows in a plane perpendicular to the direction of magnetic flux, hence it is called eddy current. Eddy current losses also cause the iron core to heat up. In order to reduce eddy current losses, the iron core of the transformer is stacked with silicon steel sheets that are insulated from each other, allowing eddy currents to pass through a narrow circuit with a smaller cross-section, thereby increasing the resistance on the eddy current path; Together, the silicon in silicon steel increases the resistivity of the material and also reduces eddy currents.

The iron core used as a transformer is generally made of 0.35mm thick cold-rolled silicon steel sheets. According to the required size of the iron core, it is cut into long pieces and then overlapped into a "Japanese" or "mouth" shape. In theory, to reduce eddy currents, the thinner the thickness of silicon steel sheets and the narrower the spliced strips, the better the effect. This not only reduces eddy current losses and temperature rise, but also saves materials for silicon steel sheets. But in reality, when manufacturing silicon steel sheet iron cores. Not only from the above advantageous factors, but also because manufacturing the iron core in that way greatly increases labor hours and reduces the cross-section of the iron core. Therefore, when using silicon steel sheets to manufacture transformer cores, it is necessary to consider the specific situation, weigh the pros and cons, and choose the optimal size.

Article source: Transformer silicon steel sheethttp://www.cheungshun.com/