Wave shape of currents in an individual rotor conductor of a single phase induction motor

The phenomena which take place in the rotor of a single-phase motor, can be explained in two different ways. The first is that proposed by Galileo Ferraris, and consists in the resolution of a single-phase field into two fields rotating in opposite directions. The second is the method proposed and developed by Val. A. Fynn, which treats the alternating-current motor problems on a basis similar to those of the direct-current motor. The latter method has given a big impetus to the general understanding of the working conditions of the single-phase motor. Both methods lead naturally to the same result. Frequently it is of interest and very instructive to solve certain problems by the use of both methods, since a comparison between the two frequently throws more light on the subject. In this paper the wave shape of the currents in an individual conductor of a single phase motor will be determined, first by Ferraris' method, by making use of the rotating field theory; and secondly by Fynn's method.