The inductor is generally composed of a skeleton, a winding, a shield, a packaging material, a magnetic core or an iron core.
1. Skeleton Skeleton refers generally to the stent for winding coils. Some of the larger fixed or adjustable inductors (such as oscillating coils, choke coils, etc.) are mostly surrounded by enameled wire (or gauze covered wire) on the skeleton, and then the magnetic core or copper core, iron core, etc. Installed in the inner cavity of the skeleton to increase its inductance. The skeleton is usually made of plastic, bakelite, ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color-coded inductors) generally do not use a skeleton, but directly wire the enameled wire around the core. Hollow inductors (also known as birth coils or hollow coils, mostly used in high-frequency circuits) do not use magnetic cores, skeletons, and shields. Instead, they are wound on the mold before removing the mold, and pulling between the coils. Drive a certain distance.
2. Winding Winding refers to a group of coils with specified functions. It is the basic component of an inductor. There are single and multiple windings. There are two forms of single-layer winding: dense winding (one turn of the wire when winding) and inter-winding (a certain distance between each turn of the wire when winding); multi-layer windings have layered flat winding and random winding. Winding, hive winding and other methods.
3. Magnetic core and magnetic rod The magnetic core and magnetic rod are generally made of nickel-zinc ferrite (NX series) or manganese-zinc ferrite (MX series) and other materials. It has "I" shape, column shape, cap shape, "E" Shape, can shape, etc.
4. Iron core The core materials mainly include silicon steel sheet, permalloy, etc., and their shapes are mostly "E".
5. Shielding cover In order to avoid the magnetic field generated by some inductors during operation to affect the normal operation of other circuits and components, a metal screen cover (such as the oscillation coil of a semiconductor radio) is added to it. Inductors using a shield will increase the coil loss and reduce the Q value.
6. Packaging materials After some inductors (such as color code inductors, color ring inductors, etc.) are wound, the coils and cores are sealed with packaging materials. The packaging material is plastic or epoxy.
Copper coil
Inductance is the ratio of the magnetic flux of a wire to the current that produces it when an alternating current flows through the wire. When a DC current is passed through the inductor, only a fixed magnetic field line appears around it, which does not change with time;
However, when an alternating current is passed through the coil, magnetic flux lines that change with time will appear around it. According to Faraday's law of electromagnetic induction-magnetoelectricity analysis, the changing magnetic field lines will generate an induced potential at both ends of the coil. This induced potential is equivalent to a "new power source". When a closed loop is formed, this induced potential generates an induced current. According to Lenz's law, the total amount of magnetic field lines generated by the induced current should try to prevent the change of magnetic field lines. The change of the magnetic field line comes from the change of the external alternating power supply. Therefore, from the objective effect, the inductance coil has the characteristic of preventing the current change in the AC circuit. Inductive coils have characteristics similar to inertia in mechanics. They are called "self-inductive" in electricity. Usually, the moment the switch is opened or the switch is turned on, a spark will occur. Caused by high induced potential.
In short, when the inductive coil is connected to the AC power source, the magnetic lines of force inside the coil will change with the change of the current, causing the coil to generate electromagnetic induction. The electromotive force generated by the change in the coil's current is called "self-inductive electromotive force". It can be seen that the inductance is only a parameter related to the number of turns, size and shape of the coil and the medium. It is a measure of the inertia of the inductor coil and has nothing to do with the applied current.
Substitution principle: 1. The inductance coil must be replaced with the original value (equal number of turns, same size). 2. The chip inductors need only be the same size, and can also be replaced with 0 ohm resistors or wires.
1. Skeleton Skeleton refers generally to the stent for winding coils. Some of the larger fixed or adjustable inductors (such as oscillating coils, choke coils, etc.) are mostly surrounded by enameled wire (or gauze covered wire) on the skeleton, and then the magnetic core or copper core, iron core, etc. Installed in the inner cavity of the skeleton to increase its inductance. The skeleton is usually made of plastic, bakelite, ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color-coded inductors) generally do not use a skeleton, but directly wire the enameled wire around the core. Hollow inductors (also known as birth coils or hollow coils, mostly used in high-frequency circuits) do not use magnetic cores, skeletons, and shields. Instead, they are wound on the mold before removing the mold, and pulling between the coils. Drive a certain distance.
2. Winding Winding refers to a group of coils with specified functions. It is the basic component of an inductor. There are single and multiple windings. There are two forms of single-layer winding: dense winding (one turn of the wire when winding) and inter-winding (a certain distance between each turn of the wire when winding); multi-layer windings have layered flat winding and random winding. Winding, hive winding and other methods.
3. Magnetic core and magnetic rod The magnetic core and magnetic rod are generally made of nickel-zinc ferrite (NX series) or manganese-zinc ferrite (MX series) and other materials. It has "I" shape, column shape, cap shape, "E" Shape, can shape, etc.
4. Iron core The core materials mainly include silicon steel sheet, permalloy, etc., and their shapes are mostly "E".
5. Shielding cover In order to avoid the magnetic field generated by some inductors during operation to affect the normal operation of other circuits and components, a metal screen cover (such as the oscillation coil of a semiconductor radio) is added to it. Inductors using a shield will increase the coil loss and reduce the Q value.
6. Packaging materials After some inductors (such as color code inductors, color ring inductors, etc.) are wound, the coils and cores are sealed with packaging materials. The packaging material is plastic or epoxy.
Copper coil
Inductance is the ratio of the magnetic flux of a wire to the current that produces it when an alternating current flows through the wire. When a DC current is passed through the inductor, only a fixed magnetic field line appears around it, which does not change with time;
However, when an alternating current is passed through the coil, magnetic flux lines that change with time will appear around it. According to Faraday's law of electromagnetic induction-magnetoelectricity analysis, the changing magnetic field lines will generate an induced potential at both ends of the coil. This induced potential is equivalent to a "new power source". When a closed loop is formed, this induced potential generates an induced current. According to Lenz's law, the total amount of magnetic field lines generated by the induced current should try to prevent the change of magnetic field lines. The change of the magnetic field line comes from the change of the external alternating power supply. Therefore, from the objective effect, the inductance coil has the characteristic of preventing the current change in the AC circuit. Inductive coils have characteristics similar to inertia in mechanics. They are called "self-inductive" in electricity. Usually, the moment the switch is opened or the switch is turned on, a spark will occur. Caused by high induced potential.
In short, when the inductive coil is connected to the AC power source, the magnetic lines of force inside the coil will change with the change of the current, causing the coil to generate electromagnetic induction. The electromotive force generated by the change in the coil's current is called "self-inductive electromotive force". It can be seen that the inductance is only a parameter related to the number of turns, size and shape of the coil and the medium. It is a measure of the inertia of the inductor coil and has nothing to do with the applied current.
Substitution principle: 1. The inductance coil must be replaced with the original value (equal number of turns, same size). 2. The chip inductors need only be the same size, and can also be replaced with 0 ohm resistors or wires.
