Introduction
The Hollow coil has a blocking effect, and the self-inductive electromotive force in the air core coil coil is always resistant to the current change in the coil. The Hollow coil has an obstruction effect on the alternating current, and the size of the obstruction is called inductive reactance XL, and the unit is ohms. Its relationship with the inductor l and alternating current frequency f is xl=2πfl.
The Hollow coil has the function of tuning and frequency selection, and the Hollow coil and the capacitor can be connected in parallel to form an LC tuning circuit. That is, the inherent oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, and the inductive reactance and capacitive reactance of the loop are also equal, so the electromagnetic energy oscillates back and forth in the inductance and capacitor, which is the resonance phenomenon of the LC loop. When resonating, the inductive reactance and capacitive reactance of the circuit are equivalent and reversed, the inductive reactance of the total current of the loop is small, the amount of current is large (referring to the AC signal of F = "F0"), the LC resonant circuit has the role of selecting the frequency, and can select the AC signal of a certain frequency F.
Scope of application
Hollow coils are mainly used in induction reception, focusing, magnetic card, magnetic head, high-current coil, low-voltage electrical appliances, industrial control, household appliances, automotive electronics, SMT mounting, mobile phones, wireless transceivers, electronic navigators, power regulators, amplifiers, supplies and filters and other fields.
Product features
1. Inductance
The inductance L is an inherent characteristic of the coil itself, independent of the magnitude of the current. Inductance is generally indicated by a specific name.
2. Sensory resistance
The magnitude of the inductive coil's hindrance on AC current is called inductive reactance XL, and the unit is ohms.
3. Quality factors
The quality factor Q is a physical quantity that represents the mass of the coil, and Q is the ratio of inductive reactance XL to its equivalent resistance, that is: Q=XL/R.
The higher the Q value of the coil, the smaller the loss of the loop. The Q value of the coil is related to the DC resistance of the wire, the dielectric loss of the skeleton, the loss caused by the shielding case or iron core, the influence of high-frequency skin effect, and other factors. The Q value of the coil is usually tens to hundreds.
4. Distributed capacitance
The capacitance present between turns and turns of the coil, between the coil and the bottom plate, and between the coil and the shielding case is called the distributed capacitance. The presence of distributed capacitance reduces the Q value of the coil and deteriorates stability, so the smaller the distributed capacitance of the coil, the better.
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