Transformer (Transformer) is a kind of static motor, it can convert one form of voltage power to another form of voltage power.
First, the classification and use of transformers
Power transformers: Transformers used to transmit and distribute power in power systems.
Question 1 why long-distance transmission must use high-voltage power transmission?
Electric furnace transformer (special),
Electric furnace (such as steel furnace) power supply.
Welding transformers (special),
Electric welding machine.
Rectifier transformer (special):
Power the DC locomotive.
Experimental transformers (transformers).
Control Transformer: used in electronic circuits.
Second, the working principle of the transformer
A core: to provide a closed path of flux.
Two windings: primary winding (primary) N1, secondary winding (secondary) N2. The company is located in:
(2) working principle
When a winding connected to the AC voltage, there is excitation current i0 exist, the current in the core can produce an alternating main flux Φ.
Ф induces potentials e1 and e2 in the two windings, respectively
e1 = -N1 dФ / dt e2 = -N2 dФ / dt
If omitted winding resistance and leakage voltage drop, then the ratio of the above two formulas:
U1 / U2≈ (-e1) / (-e2) = N1 / N2
U1 / U2 ≈ (-e1) / (-e2) = N1 / N2 = k, k is defined as the transformation ratio of the transformer. That is: U1 / U2 = N1 / N2 From this formula can be seen, if the fixed U1, as long as change the turns ratio can achieve the purpose of changing the voltage, namely:
If N2> N1, the step-up transformer (step-up transformer);
If N2 <N1, the step-down transformer (step-down transformer).
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