Publisher's Synopsis
Excerpt from The Remy Ignition System on Aircraft Engines: Instruction Book
In the case of a magneto of conventional type, the armature revolves in the field of a permanent magnet, carries primary and secondary windings, and serves as a combined generator and induction coil. Low voltage current is generated in the primary winding; high voltage current is induced in the secondary winding, when the primary circuit is broken by the opening of the contact breaker points. As the secondary winding is in connection with the plugs, via the distributor and leads, a spark passes each plug in order, since the voltage immediately attains a very high value and overcomes the resistance of the gap. The path of the mag netic ?ux, which threads the armature windings, changes instantly when the primary circuit is broken, the change of path enhancing the induced voltage in the doubly wound armature. The magnetic field is distorted by the rotation within it of windings carrying current, but the natural path of the magnetic ?ux is resumed when the current fails in the primary winding. This change of path causes a very rapid cutting of the multi-turn secondary winding by the lines of force.
The high voltage induced in the secondary winding of a magneto is due to several factors, including.
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