The electromagnetic induction heating coil is made of high-temperature copper core wire winding around an insulator, and the high-temperature copper core wire is insulated from each other, and the insulator can be hollow, or can contain an iron core or a magnetic powder core. The inductance of the coil is represented by L, and the unit is Henry (H), millihenry (mH), microhenry (μH), 1H=10^3mH=10^6μH. We often use μH as the references of inductance value.
The induction coil is a part of electromagnetic induction heating system. There's a certain electromagnetic field will be generated around the induction coil wire, which would effect on the wire itself that generates the electromagnetic field is called "self-inductance", that is, the changing current generated by the wire itself produces a changing magnetic field, and this magnetic field further affects the current in the wire; the effect on other wires in the electromagnetic field range. , called "mutual inductance".
