An improved dual-circuit D-C generator

A DUAL-CIRCUIT generator as described in this article is a 4-pole d-c generator with one commutator and two load circuits. Each load circuit is independent of the other circuit, with respect to load, voltage, and polarity, although they are not electrically isolated from each other. Figure 1 shows how the load circuits are connected to the armature. This type of generator is not new, but until recently it was built with two commutating poles. One commutating pole had one winding excited by the current of one circuit, and the other commutating pole had one winding excited by the current of the other circuit. Commutation was the limiting factor in the older design, and required the generator to be underrated as compared to a standard d-c generator.