Basic knowledge of inductors | GETWELL

Custom inductor manufacturer tells you

There are many kinds of inductors with different shapes, the more common ones are: single-layer flat-wound air-core inductor coil, inter-wound air-core inductor coil, bodiless air-core coil, multi-layer air-core inductor coil, honeycomb inductor coil, magnetic core inductor coil, magnetic tank inductor coil, high-frequency resistance coil, low-frequency resistance coil, fixed inductor and so on.

The main uses of inductors in the circuit: first, it is used as circuit tuning, such as tuning coil in radio and resonant coil of intermediate frequency transformer, etc.; second, it is used in oscillation circuit, such as oscillation coil in radio, and inductance coil in all kinds of LC oscillation circuit; third, it is used in blocking current filter, such as LC filter inductor used in power filter; fourth, resonant inductor is used in band pass and band stop filter for frequency selection.

Inductance coils are wound around insulated pipes by wires, which are insulated from each other, and the insulated tubes can be hollow or contain iron core or magnetic powder core.

Inductor coil, as a kind of inductor components, has a wide range of applications. Inductor coils are mostly non-standard components and can be wound by themselves, so how should inductance coils be wound? what are the winding methods of inductor coils? the total winding methods of inductor coils include single-layer winding and multi-layer winding, which are suitable for different sizes of inductors. Among them, single-layer winding and multi-layer winding are divided into different winding methods. Zidianjun will introduce the specific details for you.

The winding method of enamelled wire on the skeleton of inductor coil can be divided into single-layer winding method and multi-layer winding method.

The first winding method: single-layer winding method

Single-layer inductor coil is widely used in today's circuit applications, usually its inductance is only a few or dozens of micro-Heng. The Q value of this kind of coil is generally high, and most of them are used in high frequency circuits.

In the design of single-layer inductor coil, the winding methods of single-layer inductor coil are usually close winding method, inter-winding method and tire-free winding method. These three winding methods are also suitable for different circuits and appliances.

1. In fact, the tight winding method is to wrap the wires next to each other densely around the skeleton. This kind of coil inductance is usually used in antennas, such as radio, semiconductor tape recorder antenna coil and so on.

2. The winding mode of the inter-winding method is generally similar to that of the dense winding method, except that there is a gap between the coils rather than close to each other as close-wound as you want. This kind of inductor has small distributed capacitance and high frequency performance, so it is very suitable to be used as a shortwave antenna.

3. The coil of the bodiless winding method is actually the hollow coil, which can also be said to be the deformation of the close winding method, that is, the skeleton of the close winding method is extracted, and the gap between each coil is properly adjusted according to the required indicators, or the shape of the coil is changed directly. It is generally used as a resonant circuit in high frequency circuits.

The second winding method: multi-layer winding method

Single-layer coils can only be used in situations with small inductance, so when the inductance is greater than 300 μ H, multi-layer coils should be used.

The multi-layer winding method can be divided into multi-layer dense winding and honeycomb winding: if the winding of the honeycomb inductor coil, its plane is not parallel to the rotation plane, but intersects into a certain angle, this kind of coil is called honeycomb coil. And the number of times the wire bends back and forth in one rotation is often called the number of break points. The advantages of honeycomb winding are small size, small distributed capacitance and large inductance.

The inductor works based on the principle of self-induction. When the inductor coil passes through the current, it will produce the self-inductive electromotive force, the magnitude of the self-inductive electromotive force is proportional to the rate of change of the current passing through the inductor coil, and always opposes the change of the original current. Therefore, the inductor has the function of DC and AC resistance.

The inductor can be tested by a multimeter. Put the multimeter in the "R × 1" block, the two pens (no matter positive or negative) are connected with the two pins of the inductor, the needle indication should be close to "0 Ω", and the inductor with large inductance should have a certain resistance value. If the watch hand does not move, it means that the internal circuit of the inductor is open; if the watch needle indicates instability, the internal contact is poor.

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Specializing in the production of various types of color ring inductors, beaded inductors, vertical inductors, tripod inductors, patch inductors, bar inductors, common mode coils, high-frequency transformers and other magnetic components.


Post time: Jun-17-2022