News Category

Electrical knowledge

What is Transformer

Views : 179
Update time : 2018-12-26 16:47:04
A lots of friends would ask:”What is a transformer? “ When they  heard the word of “transformer”. In fact, transformers are everywhere in our daily life.Transformers are widely used in workshops,machineries,school,buildings,traffic system,project,etc.Theoretically speaking, transformer is a static electrical device (sometimes called an electrical machine) that transfers electrical energy between two or more circuits. A varying current in one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force (emf) or "voltage" across a second coil wound around the same core. Electrical energy can be transferred between the two coils, without a metallic connection between the two circuits. Faraday's law of induction discovered in 1831 described the induced voltage effect in any coil due to changing magnetic flux encircled by the coil.

The principle of the transformer: When an alternating current is passed through the primary coil, an alternating magnetic flux is generated in the iron core (or core) to induce a voltage (or current) in the secondary coil.
Transformer structure: The transformer consists of a core (or core) and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary coil, and the other winding is called the secondary coil.

Transformer manufacturing principle:
In the generator, whether the coil moves through the fixed coil through the magnetic field or the magnetic field, the potential can be induced in the coil. In both cases, the value of the magnetic flux is constant, but the number of magnetic fluxes intersecting the coil is Change, this is the principle of mutual induction. A transformer is a device that uses electromagnetic mutual induction to transform voltage, current, and impedance.

Transformer classification
Classified by cooling method: dry (self-cooling) transformer, oil immersed (self-cooling) transformer, fluoride (evaporative cooling) transformer.
Classified according to the moisture-proof method: open transformer, potted transformer, sealed transformer.
According to the core or coil structure classification: core transformer (insert core, C core, ferrite core), shell transformer (insert core, C core, ferrite core), Ring transformer, metal foil transformer.
Classified by power phase number: single-phase transformer, three-phase transformer, multi-phase transformer.
Classified by use: power transformer, voltage regulator, audio transformer, intermediate frequency transformer, high frequency transformer, pulse transformer.