As a transformer core, a 0.35mm thick cold-rolled silicon steel sheet is generally used. According to the required size of the iron core, it is cut into a shape sheet and then overlapped into a "Japanese" shape or an "I" shape. In theory, if the eddy current is reduced, the thinner the silicon steel sheet is, the narrower the spliced ​​sheet is, and the better the effect is. This not only reduces the eddy current loss, reduces the temperature rise, but also saves the use of silicon steel sheet. But when actually making silicon steel cores. Not only from the favorable factors mentioned above, because the production of iron cores, it will greatly increase man-hours, but also reduce the effective cross-section of the core. Therefore, when making transformer cores from silicon steel sheets, it is necessary to weigh the pros and cons and choose the best size from the specific conditions.
The transformer is based on the principle of electromagnetic induction. Two windings, one primary winding, and one secondary winding are wound on the closed iron core. When the original winding is supplied with AC power voltage, Change the current, and establish the magnetic potential, under the action of the magnetic potential will produce alternating main magnetic flux in the core, the main magnetic flux in the iron core at the same time through, {cross chain] a secondary winding and closed due to electromagnetic induction The role of induction electromotive force in the first and second winding, respectively, as to why it can boost and buck it? It needs to be explained by the Lenz's law that the magnetic flux generated by the induced current always hinders the change of the original magnetic flux. When the original magnetic flux increases, the magnetic flux generated by the induced current is opposite to that of the original magnetic flux, that is, twice. The induced magnetic flux generated by the winding is opposite to the main flux generated by the primary winding, so the secondary winding has a low level of alternating voltage so the iron core is the magnetic circuit part of the transformer and the winding is the circuit part of the transformer.
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