Common classification of inductive coils:

1 single layer coil

The single-layer coil is wound on the paper cylinder or bakelite frame with insulated wires one by one. Such as transistor radio medium wave antenna coil.

2 honeycomb coil

If the plane of the wound coil is not parallel to the rotating surface, but intersects at a certain angle, this coil is called honeycomb coil. The number of times the wire bends back and forth after one revolution is often called the number of turns. The advantages of honeycomb winding method are small volume, small distributed capacitance and large inductance. Honeycomb coils are 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. Rotating the position of copper core coil to change the inductance is more convenient and durable.

5 color coded inductance coil

The utility model relates to a high-frequency inductive coil, which is formed by winding some enamelled wires on the magnetic core and then packaging with epoxy resin or plastic. Its working frequency is 10kHz to 200MHz, and the inductance is generally between 0.1uh and 3300uh. Color code inductor is an inductor with fixed inductance, and its inductance is marked by color ring like resistance. Its unit is uh.

6 choke (choke)

The coil limiting the passage of alternating current is called the choke coil, which is 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 requirements: high deflection sensitivity, uniform magnetic field, high Q value, small volume and low price.