Type of wire coil toroidal winding machine 6

Blocking action

The self induced electromotive force in the inductance coil always competes with the change of current in the coil. The inductance coil has a blocking effect on AC current. The size of the blocking effect is called inductive reactance XL, and the unit is Ohm. The relationship between inductance L and AC frequency f is XL = 2 π fl. inductors can be mainly divided into high-frequency choke coil and low-frequency choke coil.

Tuning and frequency selection

The LC tuning circuit can be composed of inductance coil and capacitor in parallel. That is, if the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non AC signal, the inductive reactance and capacitive reactance of the circuit are also equal, so the electromagnetic energy oscillates back and forth in the inductance and capacitance, which is the resonance phenomenon of the LC circuit. During resonance, the inductive reactance and capacitive reactance of the circuit are equivalent and reverse. The inductive reactance of the total circuit current is the smallest and the current is the largest (referring to the AC signal of F = "F0"). LC resonance circuit has the function of selecting frequency and can select the AC signal of a certain frequency f.