How to determine whether the inductor is damaged

How to determine whether the inductor is damaged?

1, open circuit, with a multimeter buzzer gear, meter ring proved to be a good channel. If it does not sound, it means open circuit, or it is about to open circuit, and it can be judged as damaged;

2. Abnormal inductance is also regarded as damage;

3, short circuit, will lead to leakage.

inductance coil and transformer:

Inductance coil: When there is a current in the wire, a magnetic field is established around it. 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) on the insulating tube (insulator, iron core or magnetic core) by one turn (the wires are insulated from each other). In general, the inductor has only one winding.

The structure of an inductor is generally composed of a skeleton, a winding, a shielding case, a packaging material, an iron core and a magnetic core!

Transformer: When a changing current flows through the inductor coil, it not only generates an induced voltage at both ends of itself, but also generates an induced voltage in a nearby coil. This phenomenon is called mutual inductance. Two coils that are not connected to each other but are close to each other and have electromagnetic induction are generally called transformers.

When the current passes through the inductor, the inductor will induce a voltage, and the current direction of this voltage is just opposite to the direction of the current to pass, but this is only a matter of a moment, and then there is no such resistance!

When the current through the inductor in the circuit is about to be disconnected, the inductor generates another voltage, and the generated current is just the opposite direction of the current to be disconnected-it does not allow the current to be disconnected!

It can be seen that the role of inductance is to hinder the change of current, but this effect is different from that of resistance to hinder the flow of current.

Resistance blocking current is realized by consuming electric energy, while inductance blocking current change process does not consume electric energy. When blocking current increases, it temporarily stores electric energy in the form of magnetic field, and when current decreases, it releases magnetic field energy.

People use this characteristic of inductance to "cut off AC and pass DC": when the direction of AC changes continuously, the inductance will constantly resist, and as a result, the alternating current with changing direction cannot pass through the inductance; And DC can pass through the inductor smoothly because the current direction will not change.

Inductors have different blocking effects on alternating current: the same inductor has a large blocking effect on fast-changing current and a small blocking effect on slow-changing alternating current; For alternating current with the same change speed, the inductance with large inductance value has a large blocking effect, while the inductance with small inductance value has a small blocking effect!

How to determine whether the inductor is damaged?

In addition to the above three conditions of open circuit, abnormal inductance and short circuit, there are other methods that can be used to determine whether the inductance is damaged.

First, we can observe the appearance of the inductor. If the wire of the inductor coil is broken, damaged or changed in color, it may be due to damage caused by long-term use or improper use. At the same time, if the skeleton, winding, shielding and other parts of the inductor are damaged or deformed, it also indicates that the inductor may have been damaged.

Secondly, we can measure the impedance of the inductor to determine whether it is damaged. Under normal circumstances, the impedance of the inductor should be relatively stable. If the impedance suddenly becomes larger or smaller, or there is an unstable situation, it may be the performance of the inductor damage.

In addition, we can also judge whether the inductor works normally by testing its working current. Under normal working current, the inductance coil should be able to work normally without overheating, smoke, etc. If the operating current is abnormal, it may be caused by damage to the inductor.

Finally, we can also test the performance parameters and quality of inductors through professional electronic equipment. For example, the inductance tester can be used to measure the inductance, quality factor and other parameters of the inductor, so as to determine whether the inductor is working properly.

In summary, judging whether the inductor is damaged requires comprehensive consideration of multiple aspects, including appearance, impedance, working current and performance parameters. If the inductor is found to be abnormal, it should be handled or replaced in time to ensure the normal operation of the electronic equipment.