Most ignition coil cores are made of laminated iron. The iron is ideal as it is
easily magnetized and demagnetized. The laminations reduce eddy currents,
which cause inefciency due to the heating effect (iron losses). If thinner
laminations or sheets are used, then the better the performance.
Powder metal is now in use as coil cores. This reduces eddy currents to a
minimum but the density of the magnetism is decreased. Overall, however,
this produces a more efcient and higher output ignition coil. Developments
are continuing and the ux density problem is about to be solved, giving rise to
even more efcient ...
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