Design of auxiliary phase windings for resistance-start split-phase fractional-horsepower induction motors

The paper presents a new method for designing the auxiliary winding of a resistance-start split-phase type of small (f.h.p.) squirrel-cage motor. It is primarily aimed at helping a practical design engineer to choose an auxiliary winding which uses the minimum of copper while, at the same time, satisfying all specifications. The equations are developed in such a form as to facilitate the graphical display of information required during the design process. Also, it is demonstrated that a computer program can be developed using this method to give practical auxiliary-winding designs.