News and information


Common sense inspection of inductive coils

Release time:

2023-07-26 08:58

Series and parallel connection of inductive coils

Each inductor coil has a certain amount of inductance. If two or more inductor coils are connected in series, the total inductance increases and the total inductance after series connection is:

L string = L1 + L2 + L3 + L4

When the coils are connected in parallel, the total inductance decreases, and the total inductance after parallel connection is: L and = 1/(1/L1+1/L2+1, Layer 3+1 and L4+... )

The above formula is for each coil of the magnetic field is isolated and not in contact with each other, if the magnetic field is in contact with each other, it should be considered separately.

Detection of inductive coils

When selecting and using an inductive coil, the first thing to think about is the inspection and measurement of the coil before you can judge the quality of the coil. Accurate measurement of the inductance and quality factor Q of inductive coils requires specialized instruments and complicated testing methods. In practice, this kind of testing is generally not carried out, but only the on-off inspection of the coil and the size of the Q value judgment. The resistance distribution of the multimeter can be used to measure the DC resistance of the coil, and then compared with the original determination of the resistance or nominal resistance. If the measured resistance is much greater than the original determination of the resistance or nominal resistance, even if the pointer does not move (resistance tends to infinity X can determine whether the coil is disconnected. If the measured resistance is very small, it is judged to be a local short circuit It is difficult to compare the two cases, and it can be judged that the coil is bad and cannot be used. If there is no difference between the detected resistance and the original measured resistance or nominal resistance, it can be judged that the coil is good. In this case, we can judge the quality of the coil, i.e. 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 higher the Q value. If a multi-strand winding system is used, the more strands of wire, the higher the Q value. The lower the loss of material used in the coil backbone (or core), the higher the Q value.