The commonly used transformer iron core is generally made of silicon steel. Silicon steel is made of silicon (also known as silicon), with a silicon content of 0.8? 4.8%. Due to the iron core of silicon steel transformers and the fact that silicon steel itself is a magnetic material with strong magnetic conductivity, significant magnetic induction can occur in power coils, resulting in smaller transformer volumes.

We know that transformers in practice always operate in AC conditions, and the power loss is not only in the coil resistance, but also in the center under AC magnetization. The center of power loss is usually "iron loss", which is caused by two reasons: "hysteresis loss" and "eddy current loss".

Hysteresis loss is the iron loss caused by hysteresis, which is proportional to the size of the area surrounded by the hysteresis loop of the data. The hysteresis loop of silicon steel is narrow, and the hysteresis loss of the transformer core is small, which can greatly reduce it.

Since silicon steel has the above advantages, why not use a whole piece of silicon steel as the center and process it into sheets?

This is because the chip can reduce other iron losses - "eddy current losses". When a transformer is in operation, the coil has alternating current, and the flux it generates is of course alternating. This variable induces current in the core. The induced current that occurs in the core flows in a plane perpendicular to the direction of magnetic flux, known as eddy current. Eddy current losses are also central. In order to reduce eddy current losses, customized silicon steel transformer cores are stacked with other insulated silicon steel plates to increase the resistance of the eddy current path through a smaller cross-section in a slender loop; Together, silicon steel increases its electrical resistivity and also plays a role in reducing eddy currents.

As the center of a transformer, a 0.35mm thick cold-rolled silicon steel plate is generally selected, cut into long pieces, and then stacked into a "sky" or "mouth" shape. In principle, if eddy currents are reduced, the thinner the thickness of the silicon steel plate and the narrower the stitching, the better the effect. This not only reduces eddy current losses and temperature rise, but also saves silicon steel plates. But in practice, it produces silicon steel cores. Not only from the advantageous factors mentioned above, but also due to the production of iron cores, the center of useful parts is reduced during large operating times. Therefore, when selecting the center for producing transformers made of silicon steel, it is necessary to weigh the pros and cons and choose the size based on the specific situation. Xixia

Transformers are manufactured based on the principle of electromagnetic induction. When there are two windings, one primary winding and one secondary winding, on a closed magnetic core column, the effect of the magnetic potential in the magnetic core will alternate with the main flux when the false power supply voltage, variable current, and magnetic potential of the primary winding are established. The main flux in the main core will pass through the secondary winding together. Due to electromagnetic induction closing in a, the secondary winding generates induced electromotive force, so why can it be lifted and will follow it Lenz's law is needed to explain the induction of magnetic flux. When the flux of induced current in the flux is opposite, the total blocking change of circular flux is opposite to that of the original flux, that is, the induced flux generated by the secondary winding is opposite to the main flux generated by the original winding. Therefore, the secondary winding is in AC voltage, and the center is the transformer part of the magnetic circuit.

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