So far in life, due to the continuous development of technology, there are many induction coils around us, and its arrival has brought great convenience to our lives. No matter what we use, we must bear in mind its precautions, it is best to read the instruction manual carefully, so that there will not be so many problems in the process of use. Sometimes, we also use inductance coils, there is a difference between solid and hollow. Today, I will let you learn about the differences between solid inductor coil and air core inductor coil, as follows:
1. The coil is wound around an insulating tube by a wire, which is insulated from each other. The insulating tube can be hollow, or it can include an iron core or a magnetic powder core.
2. Hollow and solid listening seems to make people feel that there is just an extra heart between the two, but you shouldn't underestimate these extra things. Because of this extra thing, the difference between the hollow inductor and the solid inductor can be quite large. In the case of the same number of turns and volume, the "inductance" value of an air-core inductor is much lower than that of a solid inductor. Not only that, they are used in different occasions. Hollow inductors are more suitable for occasions with a wide range of frequencies, while solid inductive reactance has a severe frequency tendency. That is to say, hollow inductive reactance allows most audio or audio frequencies to pass, and solid sense Resistance is selective, and only part of it is allowed to pass.
3. The inductance of the indirect air-core coil is very small, so it is only suitable for use in high frequency and ultra high frequency circuits. If the number of windings is small and the diameter of the wire is thicker, it can be wound without a skeleton. When the operating frequency is greater than 100MHz, generally in order to reduce the skin effect, single-strand thick silver-plated copper wire should be used for winding. It has better characteristics when using a frame or not, and the Q value is higher (up to 150-400) , The stability is also very high. The single-layer densely wound hollow coil is suitable for short-wave and medium-wave circuits, and a skeleton is generally used.
4. Regarding the single-layer densely wound hollow core coil with thick wire and small coil diameter, it can also be wound without bobbin. Generally, the inductance of the single-layer densely wound hollow wire is not large, and its Q value can reach 150-250, and it has high stability. The multi-layer air core inductor coil can achieve a larger inductance, but it has a larger volume and a larger distributed capacitance. In view of their differences, we can better choose what we need.