The commonly used transformer iron core is generally made of silicon steel sheet iron core. Silicon steel is a type of steel containing silicon, which is used to make the iron core of transformers. This is because silicon steel itself is a magnetic substance with strong magnetic conductivity, and it can generate significant magnetic induction in energized coils Then it can reduce the volume of the transformer, and the power loss of the transformer in communication state is not only limited to the resistance of the coil It also occurs 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 refers to the magnetization process of an iron core Iron loss caused by magnetic hysteresis phenomenon in mountains The size 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 core of a transformer has smaller hysteresis loss, which can greatly reduce its heat generation.

When a transformer is working, the magnetic flux generated by alternating current in the coil is of course alternating. The changed magnetic flux induces current in the iron core. The induced current that occurs in the iron core flows in a straight plane, so it is called eddy current and eddy current loss, which also causes the iron core to heat up. In order to reduce eddy current losses, the iron core of the transformer is made of silicon steel sheets that are insulated from each other Make the thirst flow in a narrow and elongated circuit, passing through a smaller cross-section to increase the electrical limit on the eddy current path; Together. The silicon in silicon steel increases the resistivity of the material It also plays a role in reducing eddy currents

The iron core used for transformers is generally made of cold-rolled silicon steel sheets with a thickness of 0.35mm. Cut it into long pieces according to the required size of the iron core, and then overlap them into a "Japanese" or "mouth" shape. In theory, to reduce eddy currents, the thinner the silicon steel sheet, the narrower the spliced strips, and the better the effect. This reduces eddy current losses, lowers temperature rise, and saves materials for silicon steel sheets. However, in actual manufacturing of silicon steel sheet iron cores Not only starting from the favorable factors mentioned above Due to manufacturing the iron core in that way, it requires a significant increase in labor hours and a reduction in the cross-section of the iron core. Therefore, when using silicon steel sheets to manufacture transformer cores, it is necessary to weigh the pros and cons based on specific circumstances and choose the size.

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