The commonly used transformer iron core is generally made of silicon steel sheets. Silicon steel is a type of steel containing silicon (also known as silicon), with a silicon content of. 0.8%~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, and it can generate a large magnetic induction intensity in the energized coil Thus, the volume of the transformer can be reduced, 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 changing magnetic flux induces current in the iron core. The induced current that occurs in the iron core flows in the plane perpendicular to the direction of conduction, 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 mutually insulated silicon steel sheets stacked together 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; At the same time 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 0.35 mm Cut it into long pieces according to the required scale of the iron core, and then overlap them into a "day" or "mouth" shape. In theory, to reduce eddy currents, the thinner the thickness of 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 practice, when manufacturing 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 reduces the useful 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 appropriate size.

Article source: Silicon steel sheet manufacturerhttp://www.cheungshun.com