Test method for inductance coils

Inductance coil is mainly used electronics industry, at present with the widespread use of computer winding machine, the production of inductance coil quality also got very big improvement, but despite technology unceasing enhancement, to the quality of the inductance coil or have to pay attention to, the following friend ou some inductance coil winding machine to tell you about some of the inductance coil test method.

The first is in the selection and use of inductance coil:

First of all, we should think of the inspection and measurement of the coil, and then judge the quality of the coil and its merits.

In order to accurately detect the inductance and quality factor Q of the inductance coil, special instruments are generally needed, and the test method is more complex.

In practice, this kind of detection is generally not carried out, only the on-off check of the coil and the size of the Q value are judged.

You can use the multimeter resistance file to measure the coil DC resistance, and then determine the original resistance value or nominal resistance value compared, if the measured resistance value than the original determined resistance value or nominal resistance value increases many, even the pointer is not moving (resistance value tends to infinity X can judge the coil break;

If the measured resistance value is very small, it is determined to be a serious short circuit 10,000 fruit local short circuit is difficult to compare the two cases, you can determine that the coil is bad, can not be used.

If the detected resistance is not much different from the original determined or nominal resistance, the coil is judged to be good.

In this case, we can judge the mass of the coil, that is, the size of the Q value, according to the following situations.

When the inductance of the coil is the same, the smaller the DC resistance, the higher the Q value.

The larger the diameter of the wire used, the greater its Q value;

If multi-strand winding is used, the more strands of wire, the higher the value of Q;

The lower the loss of the material used in the coil skeleton (or iron core), the higher the Q value.

For example, when the high silicon silicon steel sheet is used as the core, its Q value is higher than that when the common silicon steel sheet is used as the core.

The smaller the distributed capacitance and flux leakage of the coil, the higher the Q value.

For example, the Q value of the honeycomb winding is higher than that of the flat winding and higher than that of the random winding.

When the coil has no shielding cover and there is no metal component around the installation position, the Q value is higher; on the contrary, the Q value is lower.

The closer the shield or metal component is to the coil, the more serious the Q value decreases.

For the high frequency coil with magnetic core, its Q value is higher than that of the sky core.

The lower the loss of the magnetic core, the higher its Q value.