Mallory, Inc.

Alan E Dawson

Ted D Deeds

Craig A Holmes

A magneto ignition system for applications which require long burn times (usually measured in milliseconds), high spark energy to ignite the air/fuel mixtures used in racing applications and light weight. Such applications can use air fuel rations as low as 2:1. The magneto assembly includes a one-piece shaft having a polygonal center section with sides defining a plurality of magnet receiving surfaces. Each surface is fixedly provided with a magnet, preferably a rare earth magnet, with adjacent ones of the magnets being arranged to have alternating outwardly facing poles. A magneto housing contains an array of stator windings that surround the plurality of magnets. The housing also includes opposed apertures with bearings for receiving opposed ends of the shaft. A non-conductive retainer housing surrounds the plurality of magnets and is affixed to the shaft to counteract centrifugal forces acting on the magnets, thus retaining the magnets on the shaft. The non-conductive retainer is located between the magnets and the stator windings and minimizes eddy currents and heat buildup in the magneto assembly.

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Menlo Park, CA, United States of America

Alan E Dawson