Alternating-current wave windings

Simple algebraical formulae are developed by means of which, with close approximation, the angular positions of the phases of wave windings can be calculated. In this way, the amount of asymmetry can be determined in fractional-slot windings, d.c. wave windings and windings with extra empty slots. Tables are given showing the numbers of extra empty slots that can be used, and the positions in which they must be placed, in order to obtain practically symmetrical windings. Methods are developed for determining the connection points of windings, and charts are given, suitable for use in practice, for phase windings, both with a whole number and a fractional number of slots per pole and phase