. Electric railway journal . ern contract the phase converter assumes a new rank inthe electrical machinery field and for the next few yearsmust make rapid progress. The split-phase locomotive equipment comprises a num-ber of polyphase induction motors which are inherently ofthe constant-speed type, a phase-converter and any systemof control of the motors which would be used in a poly-phase system. The only features added are the phase con-verter and its controller, a very simple piece of apparatus. In a paper delivered at the 1911 convention of the Amer- v- TransformerI AxisFig. 1—Series-Repu
. Electric railway journal . ern contract the phase converter assumes a new rank inthe electrical machinery field and for the next few yearsmust make rapid progress. The split-phase locomotive equipment comprises a num-ber of polyphase induction motors which are inherently ofthe constant-speed type, a phase-converter and any systemof control of the motors which would be used in a poly-phase system. The only features added are the phase con-verter and its controller, a very simple piece of apparatus. In a paper delivered at the 1911 convention of the Amer- v- TransformerI AxisFig. 1—Series-Repulsion Motor Step Contactors F R F R 1 Z 3 5 6 7 8 9 10 II /St © © • 9 O © O ZNd © « • • O • O jgd • © © • • O © O 4~[n 9 © © • « O 9 O F-Forward fi-Rei/erseFig. 4—Contactor Diagram. Fig. 5—Simple Phase Converter leads between commutator bars and armature winding. Theshort-circuit currents in the coils are kept down by the ex-pedient of using a short-pitch winding, the coil pitch beingapproximately the same as the width of the inducingwinding. Thus when short-circuited the sides of the coils arein flux of the same kind and the coils do not link with thefield flux. This method of preventing the production oftransformer currents in the short-circuited coils is said tobe entirely satisfactory. The short-pitch winding also playsanother important part in the commutation, for, by select-ing the proper pitch, the flux distribution can be controlledso that the short-circuited coil will be located in a good re-versing field. NEW APPLICATIONS OF THE PHASE CONVERTER In the Electric Railway Journal for Aug. 23, 1913,a reference was made to the Westinghouse contract withthe Norfolk & Western Railroad. The adoption of induc-tion motors with phase-splitting devices for thi
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