Ignition coil

Details Ignition coil Ignition coil

H - Electricity

01

F

336/5

H01F 27/255 (2006.01) F02P 3/02 (2006.01) H01F 38/12 (2006.01)

Patent

CA 2013124

C-4142 IGNITION COIL Abstract of the Disclosure An ignition coil for developing spark plug firing voltages. The magnetic current for the coil comprises an axially extending core that joins axially spaced annular parts. The core and parts can be formed of iron particles in a binder of electrical insulating material. A primary winding is disposed about the core and a secondary winding is disposed about the primary winding. An axially extending circular part that is formed of magnetic material is positioned to provide air gaps with outer surfaces of said annular parts. The circular part forms a shield that increases the capacitance of the secondary winding. The total stored magnetic energy does not vary substantially with variations in air gap length. The cross-sectional area A of the air gap is large as compared to the length L of the air gap so that the ratio A/L does not vary much with variations in L.

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