An inductance in coil is a magnetic field that builds up around a wire when there is an electric current. Usually, we wind the wire into a coil to enhance the magnetic field inside the coil. The inductance coil is made by winding the wire (enameled wire, yarn bag or bare wire) around the insulating tube (insulator, iron core or magnetic core) one by one (the wires are insulated from each other) (in general, the inductance coil has only one winding) The coil is called an inductance coil.
commonly used coils
1. Single-layer coil
A single-layer coil is made of insulated wires that are wound around a paper tube or bakelite skeleton one by one. Such as transistor radio, medium wave antenna coils.
2. Honeycomb coil
If the plane of the coil wound is not parallel to the rotating plane, but intersects at a certain angle, this kind of coil is called a honeycomb coil. The number of times the wire bends back and forth after one rotation is often called the number of vertices. The advantages of the honeycomb winding method are small size, small distributed capacitance, and large inductance. The honeycomb coils are wound by the honeycomb winding machine, and the more vertices, the smaller the distributed capacitance.
3. Ferrite core and iron powder core coil
The amount of inductance of the coil is related to the presence or absence of a magnetic core. Inserting a ferrite core into an air-core coil increases the amount of inductance and improves the quality factor of the coil.
4. Copper core coil
Copper core coils are used in the ultra-short wave range, and the position of rotating copper core in the coil is used to change the inductance, which is more convenient and durable.
5. Color-coded inductors
Color-coded inductors are inductors with a fixed amount of inductance, and the inductance is marked with a color ring in the same way as a resistor.
6. Choke ring (choke)
The coil that restricts the passage of alternating current is called a choke, which is divided into a high-frequency choke and a low-frequency choke.
7. Deflection coil
The deflection coil is the load of the output stage of the TV scanning circuit, and the deflection coil requirements: high deflection sensitivity, uniform magnetic field, high Q value, small size, and low price.
the role of the inductance in coil
Flow choke
Inductance coil: The self-induced electromotive force in the coil always competes with the change in the current in the coil. The inductance coil has a hindrance effect on the alternating current, and the magnitude of the obstruction effect is called the inductive anti-XL, and the unit is ohms. Its relationship with the inductance l and the alternating current frequency f is XL=2πFL, and the inductor can be mainly divided into high-frequency choke coil and low-frequency choke coil.
Tuning and frequency selection
The inductance coil and capacitor can be connected in parallel to form an LC tuning circuit. That is, if the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, the inductive reactance and capacitive reactance of the loop are also equal, so the electromagnetic energy oscillates back and forth in the inductance and capacitor, which is the resonance phenomenon of the LC loop. When resonating, the inductive reactance and capacitive reactance of the circuit are equal and reversed, the inductive reactance of the total current of the loop is the smallest, and the current is the largest (referring to the AC signal of F="F0"), and the LC resonant circuit has the function of selecting the frequency, and the AC signal of a certain frequency F can be selected.
types of inductors
According to its appearance, inductors can be divided into hollow inductors (hollow coils) and solid inductors (solid coils). According to the nature of work, inductors can be divided into high-frequency inductors (various antenna coils, oscillation coils) and low-frequency inductors (various choke coils, filter coils, etc.). According to the packaging form, inductors can be divided into ordinary inductors, color ring inductors, epoxy resin inductors, SMD inductors, etc. According to the inductance, inductors can be divided into fixed inductors and adjustable inductors.
The function of inductance: to pass direct current and resist alternating current
Direct current connection: The so-called direct current connection refers to the function of an inductor in a direct current circuit, which is equivalent to a wire and does not have any effect.
Resistance to AC: In an AC circuit, the inductance will have an impedance, i.e. XL, and the current of the entire circuit will decrease, which has a certain blocking effect on AC.
group profile
Zhuhe Group is a company dedicated to providing customers with one-stop IoT solutions. The enterprise adheres to independent innovation, possesses profound big data, Internet of Things, and artificial intelligence technologies, and has the production and manufacturing capabilities of core components such as semiconductor devices and inductors. This comprehensive technological strength is well-known.
Our product design is unique, constantly pursuing perfection and excellence, always centered on meeting customer needs. The technology and design teams of enterprises are constantly trying to innovate, providing first-class products and services, which is also an important part of today's economic competition.
At the same time, we define ourselves as a "one-stop solution provider", and in today's fiercely competitive market, this slogan immediately captures the hearts of customers. Enterprises will build their own brand and gain an advantageous position in market competition through comprehensive technical strength and service level.
At present, in addition to our excellent technical means and manufacturing capabilities in the fields of big data, the Internet of Things, and artificial intelligence, we are also continuously improving existing technologies, accelerating the development of industries, and continuously creating high-quality products. Enterprises are constantly emphasizing the construction of culture and values, with the aim of continuously improving themselves and enhancing their core competitiveness in the constantly changing business environment.
In short, as a comprehensive and strong one-stop solution supplier, our group always focuses on customer satisfaction, constantly innovating, strengthening cooperation with various industries, and continuously improving our core competitiveness.
Q: What is the function of the inductance coil?
A: The inductance coil can realize the role of inductance, and the magnetic field interacts with the current in the circuit to achieve a variety of functions. For example, in DC circuits, the inductance coil can play a role in filtering, filtering out the pulsating DC signal output by the power supply, so that the voltage in the circuit is stable; In the oscillation circuit, the inductance coil can be used as the oscillation element of the oscillation circuit to achieve the oscillation function; In a transformer, an inductance coil converts the voltage of the power supply into a suitable voltage output to the load.
Q: What are the characteristics of inductance coils?
A: The characteristics of the inductance coil are: it has the characteristics of high frequency, which can realize the inductance effect in the high-frequency circuit; It has a certain self-resistance, whether it is used in DC or AC circuits, it will cause a certain loss; When the current flows through the inductance coil, a magnetic field will be formed, and the magnitude of the magnetic field is proportional to the magnitude of the current, which is related to the number of turns of the coil and the shape of the coil; In AC circuits, an inductor coil forms an impedance, and the magnitude of the impedance is related to the inductive magnitude and frequency of the coil.
Q: How to choose an inductance in coil?
A: When purchasing an inductance coil, you need to consider the parameters and scope of application of the coil. It mainly includes the inductive size of the coil, the number of turns, the current it receives, the working frequency, etc. At the same time, the quality and size fit of the coil should be considered, as well as the requirements of the application scenario
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