Abstract: A brushless alternator or like dynamoelectric machine, particularly adapted for use in a vehicle, comprising a field coil mounted on the center leg of a stationary core, a rotor shaft extending through the center leg of the core, a first, disc-shaped rotor member mounted on the shaft and facing the center leg of the core across a first large-area axial air gap and having a first set of radially projecting rotor poles, and a second, annular rotor member mounted on the first rotor member, facing an outer flange portion of the core across a second large-area axial air gap and having a second set of axially projecting rotor poles interleaved one-for-one with the first set.

Abstract: An improved stator for an electromagnetic transducer, such as an alternator, is characterized by a plurality of pole sections joined by a core and configured to increase the space available for stator coil windings and to minimize the length of the winding turns thereof.In the disclosed embodiment, the core is annular and the pole sections extend inwardly thereof. Each pole section includes a relatively wide base or trunk portion joined at one end with the core and formed at an opposite end into a pair of stator poles. The poles are in an annular array, and the stator is particularly adapted for use with a three-phase alternator. When so used, the stator is provided with three electrically separate winding sections, each of which has a plurality of coils connected in series with alternate coils wound in opposite directions.

Abstract: A dynamo-electric machine comprises an armature and a permanent magnet field structure including at least two permanent magnets and at least two field shoes. Each field shoe has an arcuate surface which forms one side of an air gap between the shoe and the armature, and is configured to direct magnetic flux from the permanent magnets to the arcuate surface in such a manner that the magnetic lines of force emanating from the arcuate surface and extending through the armature are of substantially uniform distribution and intensity, thereby providing a uniform magnetic field through the armature. This is accomplished by making the shoe of variable thickness to have a cross-sectional area varying substantially in proportion to the density of magnetic flux carried by the shoe at points therealong, so that the density of magnetic flux is substantially constant throughout the shoe and the shoe provides a substantially uniform distribution of magnetic flux across the arcuate surface and through the armature.

Abstract: A three-phase alternator, particularly suited for automotive use, having three stator winding sections each including a given number of coils, with each coil encompassing two stator poles and separated from the next coil in the section by an unwound pole. The rotor poles are of tapered construction, each having an effective width of two stator poles. In a preferred "brushless" construction, a D.C. excitation coil encompasses a tubular center leg of a stationary magnetic core of E-shaped cross-sectional configuration, with flux of one polarity going to the rotor partly through a shaft journalled in the center leg of the core and through a radial air gap of substantial surface area, and flux of the opposite polarity going to the rotor through a large-area radial air gap adjacent the outer flange of the core.