Magnetic coil of hydraulic valve with inner hole of 13mm 094001000

Brief introduction of electromagnetic coil

1.Inductive coil is a device that works by using the principle of electromagnetic induction. When a current flows through a wire, a certain electromagnetic field will be generated around the wire, and the wire of this electromagnetic field itself will induce the wire within this electromagnetic field. The effect on the wire itself that produces electromagnetic field is called "self-induction", that is, the changing current produced by the wire itself produces 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".

2.The electrical characteristics of the inductor coil are opposite to that of the capacitor, "passing low frequency and blocking high frequency". High-frequency signals will encounter great resistance when passing through the inductance coil, and it is difficult to pass; However, the resistance to low-frequency signals passing through it is relatively small, that is, low-frequency signals can pass through it easily. The resistance of the inductance coil to direct current is almost zero.

3.Resistance, capacitance and inductance all present some resistance to the flow of electrical signals in the circuit, which we call "impedance". The impedance of the inductance coil to the current signal uses the self-inductance of the coil. Inductance coil Sometimes we call it simply "inductance" or "coil", which is represented by the letter "L". When winding an inductance coil, the number of turns of the coil is generally called the "number of turns" of the coil.

4.The coil is wound around the insulating tube by wires, and the wires are insulated from each other, and the insulating tube can be hollow or contain iron core or magnetic powder core. The inductance of the coil is expressed by L, and the units are Henry (H), MilliHenry (mH) and Micro Henry (μH), and 1h = 10 3mh = 10 6 μ h..