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The Principle And Composition Of The Transformer


A transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, secondary coil, and iron core (magnetic core). In electrical equipment and wireless circuits, it is often used for voltage rise and fall, impedance matching, safety isolation, etc. The field moves through the stationary coil. In both cases, the value of the magnetic flux remains the same, but the flux that intersects the coil changes, which is the principle of mutual inductance. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current, and impedance.


Transformer components include a body (iron core, winding, insulation, lead wire), transformer oil, oil tank and cooling device, pressure regulating device, protection device (hygroscopic device, safety air passage, gas relay, oil conservator, temperature measuring device, etc.). ) and outlet casing. Specific composition and function:

(1) Iron core. The iron core is the main part of the magnetic circuit in the transformer. It is usually composed of hot-rolled or cold-rolled silicon steel sheets with high silicon content, with a thickness of 0.35mm, 0.3mm, and 0.27mm, and the surface is coated with insulating paint. The iron core is divided into two parts, the iron core column, and the horizontal piece, and the iron core column is sleeved with windings; the horizontal piece is used to close the magnetic circuit.

(2) Winding. The winding is the circuit part of the transformer, which is made of double-wire insulated flat wire or enameled round wire. The basic principle of the transformer is the principle of electromagnetic induction. Now take a single-phase two-winding transformer as an example to illustrate its basic working principle: when the voltage U1 is applied to the primary winding, the current I1 flows and an alternating magnetic flux is generated in the iron core. O1, these magnetic fluxes are called main magnetic fluxes, under the action of which, the windings on both sides induce potentials respectively, and finally drive the transformer adjustment device.

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