Ignition coil in accordance with the magnetic type magnetic circuit is divided into open and closed magnetic type two kinds.
Traditional ignition coil with magnet, with its core in 0.
About 3 mm silicon steel sheet pile into, around there are secondary and primary coil on the iron core.
Closed magnetic type, the use of the shape of Ⅲ core around the primary coil, and then around the secondary coil, the magnetic field lines composed closed magnetic circuit core.
Closed magnetic type ignition coil has the advantage of low magnetic leakage, small power loss, small size, so the electronic ignition system widely used magnetic closed type ignition coil.