Inductive coils possess a characteristic similar to inertia in mechanics, known as "self-induction" in electrical terms. Typically, when the knife switch is opened or closed, power inductors may spark, caused by the high induced electromotive force from this self-induction phenomenon. In summary, when an inductive coil is connected to an AC power source, the inductance manufacturer will find that the magnetic field lines within the coil change constantly with the alternating current, resulting in electromagnetic induction. This electromotive force generated by the change in current within the coil itself is referred to as "self-inductive electromotive force." It is evident that inductance, or inductance value, is a parameter related to the number of turns, size, shape, and medium of the coil. It measures the inertia of the inductive coil and is unrelated to the applied current.


The number of turns can be calculated as follows: Turns = [Inductance * { (18 * Turn Diameter (in)) + (40 * Turn Length (in))}] ÷ Turn Diameter (in) Turns = [8.116 * {(18 * 2.047) + (40 * 3.74)}] ÷ 2.047 = 19 Turns Hollow Core Inductor Calculation Formula Hollow Core Inductor Calculation Formula: L (mH) = (0.08D.D.N.N) / (3D + 9W + 10H) D - Diameter of the coil N - Number of turns in the coil d - Wire diameter H - Height of the coil W - Width Units are in millimeters and mH.


Hollow inductors, also known as shell coils or non-magnetic cores, are used in high-frequency circuits without magnetic cores, frames, or shields. They are first wound on molds and then the molds are removed, with the turns of the coil spaced apart. 2. Winding: Winding refers to a set of coils with specified functions and is a basic component of inductors. Winding can be single-layer or multi-layer. Single-layer winding comes in two forms: tight winding (where the wire is wound one layer over another) and spaced winding (where there is a certain distance between each layer of wire). Multi-layer winding includes methods such as layered flat winding, random winding, and pattern winding.


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