Thermosetting connection mode electromagnetic coil SB1034/AB310-B

Main performance indexes of inductance coil

1.inductive reactance

The magnitude of the resistance of the inductance coil to AC current is called inductance XL, with ohm as the unit and ω as the symbol. Its relationship with inductance L and AC frequency F is XL=2πfL.

2.quality factor

The quality factor Q is a physical quantity representing the coil quality, and Q is the ratio of inductance XL to its equivalent resistance, that is, Q = XL/R.. It refers to the ratio of inductance to its equivalent loss resistance when an inductor works under a certain frequency AC voltage. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency. The q value of the coil is related to the DC resistance of the conductor, the dielectric loss of the skeleton, the loss caused by the shield or iron core, the influence of high frequency skin effect and other factors. The q value of the coil is usually tens to hundreds. The quality factor of the inductor is related to the DC resistance of the coil wire, the dielectric loss of the coil frame and the loss caused by the core and shield.

3.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.

4.rated current

Rated current refers to the current value that the inductor is not allowed to pass when it is working normally. 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.

5.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 [%].