334310 Electromagnetic coil for Whirlpool gas dryer parts

Distributed capacitance

Any inductance coil has certain capacitance between turns, between layers, between the coil and the reference ground, between the coil and the magnetic shield, etc. These capacitances are called the distributed capacitance of the inductance coil. If these distributed capacitors are integrated together, it becomes an equivalent capacitor c connected in parallel with the inductance coil. The existence of distributed capacitance reduces the Q value of the coil and deteriorates its stability, so the smaller the distributed capacitance of the coil, the better.

Rated current

Rated current refers to the maximum current that the inductor is allowed to pass under normal operation. If the working current exceeds the rated current, the performance parameters of the inductor will change due to heating, and even it will be burned due to overcurrent.

Allowable variation

Allowable deviation refers to the allowable error between the nominal inductance and the actual inductance of the inductor.

Inductors commonly used in oscillation or filtering circuits require high accuracy, and the allowable deviation is 0.2 [%] ~ 0.5 [%]; However, the accuracy of coils used for coupling, high-frequency choke and so on is not high; The allowable deviation is 10 [%] ~ 15 [%].

Classify

There are several categories of inductance coils commonly used in circuits:

According to the form of inductance: fixed inductance and variable inductance.

According to the nature of the magnetic conductor, it is classified as air core coil, ferrite coil, iron core coil and copper core coil.

According to the working nature, it is classified as antenna coil, oscillating coil, choke coil, trap coil and deflection coil.

According to the winding structure, it is classified as single-layer coil, multi-layer coil, honeycomb coil, dense coil, indirect coil, bodiless coil, honeycomb coil and random coil.