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    Analyze the role of the transformer core
  • The transformer always works in communication state, and the power loss is not only in the resistance of the coil, but also in the iron core under the alternating current magnetization. Generally, the power loss in the iron core is called "iron loss", and the iron loss is formed by two reasons, one is "hysteresis loss" and the other is "eddy current loss".


    Hysteresis loss is the iron loss caused by the hysteresis phenomenon in the magnetization process of the iron core. The size of this loss 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 core hysteresis loss of the transformer is small, which can greatly reduce the degree of heat generation.


    Since silicon steel has the above advantages, why not make a whole piece of silicon steel as the iron core, but also process it into a sheet?


    This is because the sheet core can reduce another type of iron loss - "eddy current loss". When the transformer is working, there is an alternating current in the coil, and the magnetic flux it generates is of course alternating. This changed magnetic flux induces an induced current in the core. The induced current that occurs in the 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 mutually insulated silicon steel sheets, so that the eddy current flows through the narrow cross section to increase the resistance on the eddy current path; together, the silicon in the silicon steel makes The resistivity of the data increases, which also serves to reduce the eddy current.


    Used as the core of the transformer, a 0.35mm thick cold-rolled silicon steel sheet is generally used, and it is cut into a long piece according to the scale of the required core, 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 eddy current losses, reduces temperature rise, but also saves silicon steel sheet material. But actually when manufacturing silicon steel sheet iron core. Not only does the above-mentioned advantageous elements start, but the iron core is manufactured in that way, the working hours are greatly increased, and the effective cross section of the iron core is also reduced. Therefore, when manufacturing a transformer core with a silicon steel sheet, it is necessary to start from the specific situation, weigh the pros and cons, and select the best scale.


    The transformer is made according to the principle of electromagnetic induction. There are two windings on the closed core column, one primary winding, and one secondary winding. When the original winding is connected with the power supply voltage, the original Rao has a flow. The current is changed, and the magnetic potential is established. Under the effect of the magnetic potential, alternating main magnetic flux occurs in the iron core, and the main magnetic flux passes through together in the iron core, and the second winding is closed due to electromagnetic induction. The effect is that the induced electromotive force occurs in the first and second windings respectively. As for why it can boost and depressurize? Then it is necessary to explain the magnetic flux generated by the induced current, which always prevents the change of the original magnetic flux. When the original magnetic flux is added, the magnetic flux of the induced current is opposite to that of the original magnetic flux, that is, the induced magnetic flux generated by the secondary winding is opposite to the main magnetic flux generated by the primary winding, so the secondary winding has a low level. The alternating voltage is so that the iron core is the magnetic circuit of the transformer, and the winding is the circuit part of the transformer.


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