Electromagnetic coil of truck ABS regulating valve 4721950520

Common coil

1. Single layer coil

Single-layer coil is wound around paper tube or bakelite skeleton with insulated wires one by one. Such as a wave antenna coil in a transistor radio.

2. Honeycomb coil

If the plane of the wound coil is not parallel to the rotating surface, but intersects at a certain angle, this kind of coil is called honeycomb coil. And the number of times the wire bends back and forth when it rotates once, which is often called the number of folding points. Honeycomb winding method has the advantages of small volume, small distributed capacitance and large inductance. Honeycomb coils are all wound by honeycomb winding machine. The more folding points, the smaller the distributed capacitance.

3. Ferrite core and iron powder core coil

The inductance of the coil is related to whether there is a magnetic core or not. Inserting ferrite core into air-core coil can increase inductance and improve coil quality.

4, copper core coil

Copper core coil is widely used in ultrashort wave range. It is convenient and durable to change the inductance by rotating the position of copper core in the coil.

5, color code inductor

Color-coded inductor is an inductor with a fixed inductance, and its inductance is marked by a color ring like a resistor.

6, choke coil (choke)

The coil that restricts the passage of alternating current is called choke coil, which can be divided into high-frequency choke coil and low-frequency choke coil.

7. Deflection coil

Deflection coil is the load of the output stage of TV scanning circuit. Deflection coil requires high deflection sensitivity, uniform magnetic field, high Q value, small size and low price.

function

Choke action

The self-induced electromotive force in the coil of the inductance coil always counteracts 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=2πfl. Inductors can be mainly divided into high-frequency choke coils and low-frequency choke coils.

Tuning and frequency selection

An lc tuning circuit can be formed by connecting an inductance coil and a capacitor in parallel. That is, the natural oscillation frequency f0 of the circuit is equal to the frequency f 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 opposite, 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 = "F0"). lc resonant circuit has the function of selecting frequency, which can select the AC signal with a certain