Various types of special-shaped hollow coils
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The hollow coil is a device that works by the principle of electromagnetic induction. When a current flows through a wire, a certain electromagnetic field will be generated around the wire, and the conductor of this electromagnetic field will itself induction to the wire within the scope of this electromagnetic field. The effect on the wire itself that produces the electromagnetic field is called "self-inductance", that is, the changing current generated by the wire itself generates a changing magnetic field, which further affects the current in the wire; The effect on other wires in this electromagnetic field range is called mutual inductance.
The electrical characteristics of the hollow coil are the opposite of the capacitor, "passing low frequency and blocking high frequency". High frequency signal through the inductor will encounter great resistance, it is difficult to pass; The resistance to low-frequency signals passing through it is relatively small, that is, low-frequency signals can pass through it more easily. The inductor coil has almost zero resistance to direct current.
Resistance, capacitance and inductance, they will present a certain resistance to the flow of electrical signals in the circuit, this resistance we call "impedance". The impedance of the inductor to the current signal uses the self-inductance of the coil. Inductor sometimes we refer to it simply as "inductor" or "coil", represented by the letter "L". When winding an inductor, the number of turns of the coil we generally call it the "number of turns" of the coil.
The classification of hollow coils commonly used in circuits is roughly as follows: classified by inductance form: fixed inductance, variable inductance. Classification according to the properties of the magnetic permeability: hollow coil, ferrite coil, iron coil, copper coil. Classification by working nature: antenna coil, oscillation coil, choke coil, trap coil, deflection coil. According to the winding structure classification: single coil, multi-layer coil, honeycomb coil, tightly wound coil, interwound coil, spun coil, honeycomb coil, chaotic coil.
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