Do you know the basic principle of transformer
Release time:
2023-10-30
The transformer adopts the principle of magnetic coupling, and the currents of the main and auxiliary coils are not connected by wires, but are coupled together by electromagnetic induction.
Transformers use magnetic flux as a medium to transfer energy between the grid and the load.
According to Faraday's law of electromagnetic induction, the alternating current in the coil generates magnetic flux. When two coils are put together, the magnetic flux excited in the coil can not only cause self-induced voltage through itself, but also a part of it will pass through the adjacent coil, causing mutual induced voltage in the coil. This phenomenon is called a mutual inductance phenomenon, also called magnetic coupling. The transformer is a typical mutual inductance element.
Whether it is a single-phase or three-phase power transformer, the body of the transformer is composed of iron core, winding and lead. Usually the wire wound on the input core rod is called the original winding, and the wire wound on the output core rod is called the secondary winding.
In the transformer, because the original winding and the secondary winding are very close, the magnetic flux generated by the alternating current in the original winding will stimulate the induced potential in the secondary winding. If there is a load such as resistance at the end of the secondary winding, a current will be generated in the circuit connected to the secondary winding to heat the resistance. This is the basic working principle of the transformer.
In addition, the core can greatly enhance the mutual inductance, thereby transferring the vast majority of energy from the primary winding to the secondary winding.
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