Points out that for all trolley lines, suburban roads, subway and city surface lines, operated by direct current, motors should be designed in steps of cube root of two, that is at about a 25-per cent increase from step to step. For a.c. main roads steps according to square root of two, or about 41-per cent increase between motor sizes, are suggested. For speeds within 45 to 125 km. per hr. and locomotive types with two to six driving axles of total of from 580 hp. to 2320 hp., two types of motors would be sufficient.
Standardization of output of motors for street, narrow-gage and trunk-line railways
Ueber die Normung der Leistungen von Strassenbahn-, Kleinbahn- und Vollbahnmotoren
Electrochemische Zeitschrift ; 42 , n 25
1921
7 pages
1 Fig.
Article (Journal)
German
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