Dimensional requirements and induced current of ei transformer core

- May 13, 2019-

When the ei transformer core is in operation, there will be alternating current in the coil, and the magnetic flux will be generated when it is used. This varying magnetic flux produces an induced current in the core. The induced current generated in the iron core circulates in a plane perpendicular to the direction of the magnetic flux, so it is called eddy current. Eddy current losses also cause the core to heat up. In order to reduce the eddy current loss, the core of the transformer is laminated with silicon steel sheets insulated from each other, so that the eddy current flows through the narrow cross section to increase the resistance of the eddy current path, and at the same time, the silicon in the silicon steel makes The resistivity of the material increases and also acts to reduce eddy currents.

The ei transformer core is generally made of 0.35mm thick cold-rolled silicon steel sheet. According to the size of the required core, it is cut into long pieces and then overlapped into a "day" shape or a "mouth" shape. In theory, if the eddy current is reduced, the thinner the thickness of the silicon steel sheet, the narrower the spliced strip, and the better the effect. This not only reduces the eddy current loss, reduces the temperature rise, but also saves the silicon steel sheet. But actually when making silicon steel sheet iron core. It is not only based on the above-mentioned favorable factors, because the iron core is produced in that way, the working time is greatly increased, and the effective cross section of the iron core is also reduced. Therefore, when using a silicon steel sheet to make a transformer core, it is necessary to weigh the pros and cons from the specific situation and choose the best size.

The ei transformer core is made according to the principle of electromagnetic induction. There are two windings on the closed core post, one primary winding, and one secondary winding. When the original winding is connected with the AC power supply voltage, the original Rao group The flow has an alternating current, and a magnetic potential is established, and an alternating main magnetic flux is generated in the iron core under the action of the magnetic potential.