Abstract: A magneto rotor is formed of a hollow cup-shaped cylindrical drum adapted to be mounted on the flywheel of a combustion engine. A plurality of discrete cylindrically segmental permanent magnets are angularly equispaced about the interior of the drum and radially overlying the inner surface of each of these magnets is a magnetically permeable pole piece also of cylindrical segmental shape. The gaps between each of the inductors formed by a respective magnet and pole piece are filled by nonmagnetic holding blocks having lateral flanks tightly engaging the magnets and pole pieces. An adhesive tightly secures the magnets, pole pieces and blocks in the drum. The arrangement is assembled by fitting in the holding blocks and magnets and thereafter driving the pole pieces tightly in place between the holding blocks.

Abstract: A multipolar stator for magneto basically comprises a central cast-aluminum plate to which are rigidly secured the coils, points, and condenser of the ignition and electricity-generating system. Each of these active circuit components has a terminal extending outwardly beyond the periphery of this metallic disk. An insulating semirigid synthetic-resin ring surrounds this metal plate and is provided with connections that can be secured to these terminals so that wiring can lead from the connections out of the ring. Thus the rotor assembly comprises two separate subassemblies, one conductive and one insulating, and allows a parts supplier to stock various standard items to form a multiplicity of different stator types.