Thermosetting pneumatic steam solenoid valve lead coil MP-C-011

The function of inductor

1. Inductive coil flow resistance: The self-induced electromotive force in the inductor coil is always resistant to the current change in the coil. The inductance coil has a blocking effect on AC current, and the size of the blocking effect is called inductance XL, and the unit is ohm. Its relationship with inductance L and AC frequency F is XL=2mfL. Inductors can be mainly divided into high-frequency choke coils and low-frequency choke coils. The function of inductor

2. Tuning and frequency selection: The inductance coil and capacitor can be connected in parallel to form an LC tuning circuit. That is, the natural oscillation frequency f0 of the circuit is equal to the frequency of the non-alternating signal, so 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. At resonance, the inductive reactance and capacitive reactance of the circuit are equivalent and reverse, and the inductive reactance of the total loop current is the smallest and the current is the largest (referring to the AC signal with f="fO "). LC resonant circuit has the function of selecting frequency, which can select the AC signal with a certain frequency. The function of inductor

3. Inductors also have the functions of screening signals, filtering noise, stabilizing current and suppressing electromagnetic interference. The function of inductor

4. In electronic equipment, we often see some magnetic rings.

What are the functions of these little things? This magnetic ring and the connecting cable form an inductor (the wires in the cable are wound around the magnetic ring several times), which is a common anti-interference element in electronic circuits and has a good shielding effect on high-frequency noise, so it is called an absorption magnetic ring, and is usually made of ferrite material, also known as ferrite magnetic ring (referred to as magnetic ring). The upper part is an integrated magnetic ring with a mounting clip. Magnetic rings have different impedance characteristics at different frequencies. The impedance is very small at low frequency, and the impedance of the magnetic ring increases sharply when the signal frequency increases. As we all know, the higher the signal frequency, the more it radiates out. However, all the signal lines have no shielding layer, so these signal lines become good antennas to receive all kinds of messy high-frequency signals in the surrounding environment, and these signals are superimposed on the transmitted signals, which will even change the useful signals, seriously interfere with the normal work of electronic equipment and reduce the electromagnetic interference (EM) of electronic equipment. Under the action of the magnetic ring, even if the normal and useful signals pass smoothly, the high-frequency interference signals can be well suppressed and the cost is low.