How to judge the quality of inductor coil?
Inductance coil has been popularized in our daily life, and it plays an important role in electronic equipment. However, with the mixed market of inductance coil, high-quality inductor coil has become more and more difficult to find. How to judge the quality of inductor coil?
The stability of inductor coil is the degree that the inductor coil parameters change with the change of environmental conditions. Usually, the inductance temperature coefficient is used α L to evaluate the stability of inductor coil, which represents the stability of inductance relative to inductance.
The inductor temperature coefficient is mainly caused by the geometric deformation of the inductor coil caused by the expansion of the conductor of the inductor coil after heating. In order to improve the stability of the temperature of the inductor coil, the inductor coil can be made by hot winding method, and the conductor of the wound inductor coil can be connected with current to heat the conductor before winding the inductor coil.
In this way, the inductance coil can shrink after cooling and cling to the skeleton, which is no longer prone to deformation after heating, and the stability is improved accordingly. In addition to the temperature, the temperature will also cause changes in the parameters of the inductance coil. For example, when the humidity increases, the distributed capacitance and loss of the inductor coil will increase, and the stability of the inductor coil will be reduced.
If there is no special measuring instrument for the inductor coil in use, a multimeter can be used for simple quality judgment. The DC resistance of the inductor coil can be measured with the resistance block of the multimeter first, and then compared with the originally determined resistance value or nominal resistance value.
If the measured resistance is infinite, it can be concluded that the inductance coil is broken. If the measured resistance is much smaller, it can be determined that the inductance coil has a short-circuit layer. In both cases, it can be determined that the inductor coil has quality problems and can no longer be used. If the detected resistance is not different from the original determined or nominal resistance, it can be considered that the quality of the inductance coil is basically good.
