Multiplex windings for D-C. machines

With the increase in capacity of d-c. machines, the question of their successful operation has become more and more important. It is thought that multiplex windings offer creditable advantages if they are designed so that cross connections can be suitably applied and the circuits thereby kept balanced, a feature which was not given thorough consideration when multiplex windings were first tried. This paper describes machines in which the proper design may be secured when standard construction is used. Both the lap and wave types of windings are considered. The principles are applied to duplex windings in this paper, but if so desired they may be applied also to triplex and other multiplex windings. A brief description of “frog leg windings,” a recently developed type of multiplex winding, is also given.