How to judge the quality of the hollow inductor coil?

Hollow inductor coil plays an important role in electronic equipment. As more and more manufacturers with uneven quality join the market, high-quality inductors have become more and more difficult to find. Let me tell you how to judge the quality of inductors.

The stability of an inductance coil generally indicates the degree to which the parameters of the inductance coil change with changes in environmental conditions. Generally, the stability of the inductance coil can be evaluated by the inductance temperature coefficient αL. Generally, it represents the stability of the inductance relative to the tear level.

hollow inductor coil

The inductance temperature coefficient is mainly caused by the expansion of the inductor coil wire after heating, which causes the geometric deformation of the inductor coil. In order to improve the stability of the inductor coil temperature, a thermal winding method can be used to make the inductor coil, and the inductor coil wire Apply an electric current to make the wire hot before winding the inductor coil.

In this way, the inductor coil can be shrunk after being cooled and tightly attached to the frame, which is no longer prone to deformation after heating, and accordingly improves stability. In addition to temperature, temperature will also cause changes in the parameters of the inductor coil, such as increased humidity When it is large, the distributed capacitance and loss of the inductance coil will increase, thereby reducing the stability of the inductance coil.

In the use of the inductor, if there is no special measuring instrument, you can use a multimeter to make a simple quality judgment. You can use a multimeter to electrically measure the DC resistance of the inductor, and then compare it with the original or nominal resistance.

If the measured resistance value is infinite, it can be judged that the inductor coil is broken. If the measured resistance value is much smaller, then it can be judged that the inductor coil has a short circuit. Both of them can be judged that the inductor coil has a quality problem and can no longer be used.