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Transformer The Main Components
Sep 08, 2017

Transformer (Transformer) is a device that USES the principle of electromagnetic induction to change the ac voltage. The main components are primary coils, secondary coils and core (cores). The main functions are: voltage transformation, current transformation, impedance transformation, isolation, stabilization (magnetic saturation transformer), etc. According to use can be divided into: power transformer and special transformer (electric furnace change, rectifier, power frequency transformer, voltage regulator, mining, audio transformers, intermediate frequency transformer, high frequency transformer, impact transformer, instrument transformer, electronic transformer, reactor, transformer, etc.). The circuit symbol is often used as the beginning of the number. Example: T01, T201, etc.

The working principle of

A transformer consists of an iron core (or a magnet) and a coil. The coil has two or more windings, of which the winding is called a primary coil and the rest is called a secondary coil. It can transform ac voltage, current and impedance. The simplest core transformer consists of an iron core made of a soft magnetic material and a coil consisting of two or more turns on the core

The purpose of the core is to strengthen the magnetic coupling between the two coils. In order to reduce the eddy current and magnetic hysteresis loss in the iron core, the core is formed by the laminated silicon steel sheet. There is no electrical connection between the two coils and the coil is made of insulated copper wire (or aluminum wire). One coil connection is called a primary coil (or coils), and another coil is called a secondary coil (or a secondary coil). The actual transformer is very complex, inevitably exist copper loss (resistance heating coil), fever (core) iron loss and magnetic flux leakage (such as air closed magnetic induction line), in order to simplify the discussion here only introduce the ideal transformer. Ideal transformer conditions are: ignoring the leakage flux, ignoring the resistance of the original and the coils, ignoring the loss of the core, and ignoring the no-load current (the current in the coils of the coil of the coils). For example, the power transformer is close to the ideal transformer in full load operation (the output rating of the secondary coil is rated).

A transformer is a stationary electrical appliance made from the principle of electromagnetic induction. When the coil of the transformer is connected to the ac power supply, the alternating magnetic flux is generated in the core, and the alternating magnetic flux is expressed in phi. Phi is the same in the original, in the coils, phi is also a harmonic function, and the table is phi equals phi phi, phi, phi, omega, omega t. According to Faraday electromagnetic induction law, the induction electromotive force in the original and secondary coil is e1 = -n1d phi/dt, e2 = -n2d phi/dt. The number of turns of N1, N2, and coils. Figure illustrates the U1 = - e1, U2 = e2 (primary coil quantities with the Angle of the 1, said secondary coil quantities by 2) Angle under standard, its complex RMS for U1 = - e1 = jN1 Φ omega, U2 = e2 = - jN2 Φ omega, for k = N1 / N2, said strain ratio of the transformer. The ratio of the effective value of the voltage of the transformer original and the coils is equal to the ratio of the number of turns, and the difference between the voltage of the original and the coils is PI.





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