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What is the working principle of inductor

Inductors are components that can convert electrical energy into magnetic energy and store it. The structure of inductor is similar to that of transformer, but there is only one winding. The inductor has a certain inductance, which only blocks the change of current. If the inductor is in the state of no current passing, it will try to prevent the current from flowing through it when the circuit is connected; If the inductor is in a state of current flow, it will try to maintain the current when the circuit is disconnected. Inductor is also called choke, reactor and dynamic reactor. Inductors are generally composed of skeleton, winding (winding), shielding cover, packaging materials, magnetic core or iron core, etc. magnetic core and winding are the soul of inductance. From the perspective of physics, there are many magnetic domains in the magnetic core, which can be understood as very small magnets, and each small magnetic domain will produce a certain magnetic field. When the magnetic core has not been magnetized (i.e. when no current passes through), due to the disordered arrangement direction of the internal magnetic domains, the magnetic fields generated by the magnetic domains cancel each other, so the whole magnetic core is not magnetic externally. In this process, it can be considered that the magnetic domain does work under the action of the magnetization field, that is, it converts the magnetic field energy into magnetic torque and saves it, and the manifestation is the magnetic field intensity B. It is with such energy conversion that the role of inductance in the circuit is brought into full play: Energy storage: the current flowing in the coil generates a magnetic field, which then generates current. In this way, the coil can store electric energy into magnetic energy. This is achieved through the inductance of the coil. Signal sorting: remove interference signals and let only the required signals pass. According to the different signal frequency, the role of the coil is also different.

2022-10-12 14:31:10

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Classification of inductors, what is the difference between self inductors and mutual inductors

Inductors are components that can convert electrical energy into magnetic energy and store it. The structure of inductor is similar to that of transformer, but there is only one winding. The inductor has a certain inductance, which only blocks the change of current. If the inductor is in the state of no current passing, it will try to prevent the current from flowing through it when the circuit is connected; If the inductor is in a state of current flow, it will try to maintain the current when the circuit is disconnected. Inductor is also called choke, reactor and dynamic reactor. Inductors are generally composed of skeleton, winding (winding), shielding cover, packaging materials, magnetic core or iron core, etc. magnetic core and winding are the soul of inductance. There are many kinds of inductors with different shapes. The more common ones are: single-layer flat wound hollow core inductors, inter wound hollow core inductors, bodiless hollow core inductors, multi-layer hollow core inductors, honeycomb inductors, inductors with magnetic cores, magnetic can inductors, high-frequency choke coils, low-frequency choke coils, fixed inductors, etc. self inductor When there is current flowing through the coil, a magnetic field will be generated around the coil. When the current in the coil changes, the magnetic field around it also changes correspondingly. The changed magnetic field can make the coil generate induced electromotive force (induced electromotive force) (electromotive force is used to represent the terminal voltage of the ideal power supply of the active element), which is called self inductor. Electronic components, which are wound with wires and have a certain number of turns and can produce a certain amount of self inductance or mutual inductance, are often called inductive coils. In order to increase the inductance value, improve the quality factor and reduce the volume, iron cores or cores made of ferromagnetic materials are often added. The basic parameters of an inductor include inductance, quality factor, inherent capacitance, stability, passing current, frequency of use, etc. An inductor composed of a single coil is called a self inductor, and its self inductance is also called a self inductance coefficient. mutual inductor When two inductance coils are close to each other, the magnetic field change of one inductance coil will affect the other inductance coil, which is mutual inductance. The size of mutual inductance depends on the degree of coupling between the self inductance of the inductance coil and the two inductance coils. The element made by using this principle is called mutual inductor.

2022-10-12 14:26:24

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The unit parameters, functions and classification of inductors are unknown to many people

Inductors, also known as chokes, reactors, and dynamic reactors. It is an element that can convert electric energy into magnetic energy and store energy in the magnetic field. The structure is similar to the transformer and has the characteristics of DC and AC resistance. In electronic circuits, inductance mainly plays the role of filtering, current limiting, tuning, oscillation, interference suppression and magnetic field generation. Inductance units and parameters mainly include the following aspects: The symbol l indicates that the basic unit of the inductor is Henry (H), which is commonly used in milli Heng (MH) and micro Heng（ μ H) Is the unit. Conversion relationship: 1h=10^3mh=10^6 μ H。 That is, the unit conversion is generally 10 cubic. Inductance is divided into general inductance and precision inductance; General inductance: the error value is 20%, expressed in M; The error value is 10%, expressed in K. Precision inductance: the error value is 5%, represented by J; The error value is 1%, expressed in F. For example, 100k is 10 μ H. The error is 10%. Inductance can be made of conductive material coiled around the magnetic core, typically copper wire, or the magnetic core can be removed or replaced with ferromagnetic material. The core material with higher permeability than air can restrict the magnetic field more closely around the inductive element, thus increasing the inductance. The chips of some inductive components can be adjusted. Thus, the inductance can be changed. The small inductor can be directly etched on the PCB board with a method of laying spiral tracks. Small value inductors can also be used to make transistors. The same process is used in integrated circuits. In these applications, aluminum interconnects are often used as conductive materials. No matter what method is used, based on the actual constraints, the most widely used is a circuit called "spinner", which uses a capacitor and an active element to show the same characteristics as the inductive element. Inductive elements used to isolate high frequencies are often composed of a metal wire passing through a magnetic column or bead. Inductors can also be divided into self inductors and mutual inductors. When there is current flowing through the coil, a magnetic field will be generated around the coil. When the current in the coil changes, the magnetic field around it also changes correspondingly. The changed magnetic field can make the coil generate induced electromotive force (induced electromotive force) (electromotive force is used to represent the terminal voltage of the ideal power supply of the active element), which is called self inductor. When two inductance coils are close to each other, the magnetic field change of one inductance coil will affect the other inductance coil, which is mutual inductance. The size of mutual inductance depends on the degree of coupling between the self inductance of the inductance coil and the two inductance coils. The element made by using this principle is called mutual inductor.

2022-10-12 14:25:34

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