There are many types of inductor coils. Here are some common inductor coils:
1. Single-layer coil
Single-layer coils are made of insulated wires wound around a paper tube or bakelite frame. Such as the medium wave antenna coil of a transistor radio.
2. Honeycomb coil
If the plane of the wound coil is not parallel to the rotating plane, but intersects at a certain angle, this coil is called a honeycomb coil. The number of times the wire bends back and forth during one rotation is often called the number of inflection points. The advantages of honeycomb winding are small size, small distributed capacitance, and large inductance. Honeycomb coils are all wound using honeycomb winding machines. The more inflection points, the smaller the distributed capacitance.
3. Ferrite core and iron powder core coils
The inductance of the coil is related to whether there is a magnetic core. Inserting a ferrite core into an air-core coil can increase the inductance and improve the quality factor of the coil.
4. Copper core coils
Copper core coils are widely used in the ultra-short wave range. The position of the copper core in the coil is rotated to change the inductance. This adjustment is convenient and durable.
5. Color code inductors
Color code inductors are inductors with fixed inductance. The inductance is marked with color rings in the same way as resistors.
6. Choke coils
The coil that limits the passage of alternating current is called a choke coil, which is divided into high-frequency choke coils and low-frequency choke coils.
7. Deflection coils
The deflection coil is the load of the output stage of the TV scanning circuit. The deflection coils require: high deflection sensitivity, uniform magnetic field, high Q value, and small size.
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