Ignition Coil: Description and Operation

Fig. 2 Ignition Coil:

The ignition coil, Fig. 2, consists of a metal housing which accommodates metal plate jackets for reducing stray magnetic fields. The secondary winding is wound directly onto the laminated iron core and connected electrically to the center tower in the cap of the ignition coil via the core. Since the high tension is applied to the iron core, the core must be insulated by the cap and an additional insulator inserted in the base. The primary winding is located near to the outside around the secondary winding. The insulated ignition cap contains the terminals for the battery voltage and the connection to the contact breaker, symmetrically with the high tension tower. The windings are insulated and mechanically locked in position by potting with asphalt. Oil filled ignition coils are also available. The heat is dissipated through the metal plate jackets to the can.