Industry new

Simple method and instructions for making inductive coils

The electrical characteristics of the inductor coil are opposite to those of the capacitor, and have the characteristics of “blocking high frequency and passing low frequency”. The main role is to filter out high-frequency clutter, and capacitor composition tuning, oscillating circuit, high-frequency signal transformation, to prevent frequency mutations ······Inductance coil is a very important role in our lives, but to make a self-made Simple inductors can also be designed and manufactured by ordinary people.
Before making an inductor, we need to know what the inductance of the inductor we are making is. The inductors on the circuit have an inductance. If multiple inductors are connected in parallel, the total inductance is also proportional, and the total inductance after paralleling is:
C string = C1+C2+C3+C4+C5+····Cn
If the inductor is connected in series, the inductance is inversely proportional. The total inductance after the series is:
C and = 1/(1/C1+1/C2+1/C3+1/C4+...Cn)
The above formula is only applicable to the case where the electric fields of each of the inductor coils are isolated and there is no contact with each other. If the electric fields between each other come into contact with each other, the above formula is not applicable. After calculating the inductance, you can decide what the number of turns is. Here, we can try and test it with the inductance tester.
Then, when you officially wind the inductor coil yourself, pay attention to the following points:
First, according to the needs of the circuit, choose the appropriate winding method
When manufacturing an inductive coil, the winding method should be selected according to the condition of the circuit, the strength of the inductance and the width of the bobbin. The inter-winding method is used in high-frequency inductors. The advantage is that the Q value of the inductor coil can reach 150-400, which can also maintain the stability of the inductor coil. The single-layer close-wound coil is suitable for short-wave and long-wave circuits. Among them, the characteristic is that the Q value can reach 150-250, the stability is better than the inter-winding type; the multi-layer close winding uses the tight arrangement of the layers of the enameled wire, which is characterized by a large distributed capacitance; The method is to arrange the non-equilibrium between the turns, but to use a certain law and angle. The winding method is characterized by a small distributed capacitance;
In general, self-made inductors require a large amount of inductance and a small volume, but the accuracy, Q value and stability of the inductance are not high. It is recommended to use multiple layers of dense winding.
Second, choose the appropriate winding
If a suitable wire is wound around the inductor, the resistance will increase and the Q value will increase. In circuits below 2MHz, it is recommended to use a multi-stranded insulated wire to wind the coil, which can effectively suppress the skin effect reaction. The coil between the Q value and the opposite cross-sectional area of the single wire can exceed 35. %-50%. In circuits that are frequently higher than 2MHz, it is recommended to use a single thick wire winding, which can be used in the diameter of 0.28mm~1.5mm.
Third, to use the excellent skeleton when winding the skeleton coil
The choice of a good skeleton can withstand the highest temperature of the coil, and it has good insulation properties and is also conducive to processing. Moreover, although the magnetic core in the skeleton coil reduces the number of turns of the inductor coil, it does not only weaken the resistance value of the inductor coil, which is advantageous for enhancing the Q value and reducing the volume of the coil.
When selecting a core, choose the corresponding frequency and Q value at the frequency. When the frequency is lower than 1 MHz, a manganese-zinc ferrite can be used as the core; at a frequency higher than 1 MHz, a nickel-zinc ferrite material can be used as the core. To achieve high Q values and low frequencies, a larger core size should be used.
Fourth, correspondingly reduce the scattered storage capacity of the coiled coil
The use of a non-skeleton form to wound the inductor coil can effectively reduce the volume of the bulk storage by about one-fifth; and the segmented winding method can effectively reduce the bulk storage capacity of the multilayer coil by 30% to 50%. For an inductive coil, the smaller the diameter, the shorter the winding length is proportional to the bulk storage capacity; the winding thickness is inversely proportional. In short, the winding of the inductor coil, the control of the Q value is the focus.

PREVIOUS：Analysis of magnetic saturation of inductor cNEXT：Induction coil burnout cause analysis and mai