. Electric railway journal . 20 40 GO 80 100 120 140 160 180 200Torque in m-Kg. at the Motor Shaft Ehctm Ry. Journal Deri Motor—Variation of Power Factor for Different BrushPositions lators of vulcanized rubber and porcelain and one groovedporcelain span insulator. The catenary brackets are fur-nished with double bell-type porcelain insulators whichcarry a 17-strand steel catenary. The trolley wire on thecatenary section is suspended at intervals of 3 m. (9 in.). The spacing of the poles on the catenary sectionis 50 m (164 ft.), except at curves and switches. Ther^ils are bonded with Bro
. Electric railway journal . 20 40 GO 80 100 120 140 160 180 200Torque in m-Kg. at the Motor Shaft Ehctm Ry. Journal Deri Motor—Variation of Power Factor for Different BrushPositions lators of vulcanized rubber and porcelain and one groovedporcelain span insulator. The catenary brackets are fur-nished with double bell-type porcelain insulators whichcarry a 17-strand steel catenary. The trolley wire on thecatenary section is suspended at intervals of 3 m. (9 in.). The spacing of the poles on the catenary sectionis 50 m (164 ft.), except at curves and switches. Ther^ils are bonded with Browns metallic alloy, in addition to. 60 80 100 120 140 160 180 200Torque in m-Kg, at the Motor Shaft Electric Ry. Journal Deri Motor—Kilowatt Output for Different Positions ofthe Brushes This motor has series characteristics, inasmuch as itsspeed drops with an increase in torque, but it also has shuntcharacteristics, because its speed increases with an increasein the shifting of the brushes. Ordinarily motors of thistype which have not been specially dimensioned for heavystarting currents will operate sparklessly with a startingcurrent equal to about times the normal output. Goodcommutation is secured for full-load running within limits 236 ELECTRIC RAILWAY JOURNAL. [Vol. XXXVIII, No. 6. varying from 50 per cent to 125 per cent of the synchronousspeed. The regulation of the Deri motor by mechanical brushshifting instead of voltage control constitutes its great dif-ference from other single-phase commutator motors. Thecharacteristics of this motor may be summarized as fol-lows : It is always operated at constant vol
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