The sheet-like iron core can reduce another type of iron loss, namely 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. This changed 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 made of mutually insulated silicon steel sheets, 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 electrical 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 the stator 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 advantageous factors mentioned above, 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 start from the specific situation, weigh the pros and cons, and choose the appropriate scale. 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%.

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