. Journal de chemin de fer électrique . âge un tel mouvement. Le succès de l'exploitation de voitures légères à porte centrale à New York, Brook-lyn, Pittsburgh, Denver, Cleveland et d'autres citiessert de guide aux hommes de chemin de fer lors de l'achat de nouveaux équipements, et fournit une base pour faire un initialmove vers l'équipement standard, parce que tous les thesecars ont montré des économies remarquables dans l'exploitation ex-pense. Ventilation par ventilateur des moteurs anciens dispositif simple abaisse la température o pour cent sur les anciens moteurs utilisés sur les grades lourds PAR F. P. MAÏS Master Mechanic Portland Railway, Light & Power Company, Portland, Ore. The il
2004 x 1247 px | 33,9 x 21,1 cm | 13,4 x 8,3 inches | 150dpi
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. Electric railway journal . age such a movement. The successful operationof light-weight, center-door cars in New York, Brook-lyn, Pittsburgh, Denver, Cleveland and other citiesserves as a guide to railway men when purchasing newequipments, and provides a basis for making an initialmove toward standard equipment, because all of thesecars have shown remarkable savings in operating ex-pense. Fan Ventilation of Old-Type Motors Simple Device Lowers Temperature io Per Cent onOld Motors Used on Heavy Grades BY F. P. MAIZE Master Mechanic Portland Railway, Light & Power Company, Portland, Ore. The illustration herewith shows a ventilating fan at-tached to a GE-58 armature. This fan is composed ofa plate of No. 22 gage sheet steel, 14 in. in diameterwith a 8^4-in. hole, riveted to the back head of the arma-ture with twelve vanes Vi in. thick, 2% in long, withan axial width 9/32 in. at the bottom and 7/32 in. atthe top. The inside corner has a 5/16 in. fillet. Theair is taken from the inside of the shield and from the. VENTILATING FAN EQUIPMENT ON OLD ARMATURE clearance between the armature and the frame, and isthrown over the top of the armature, coming out ofeither the commutator well or the inspection hole onthe commutator end of the motor. Tests made on motorswith commutator covers on showed a considerable suc-tion of air around the pinion bearing end. The air wasdischarged through the commutator end handhole withthe armature making 500 r.p.m. Armatures were placed in motors on a car weighing39, 460 lb., equipped with magnetic brakes and runningon the hardest service grades up to 10 per cent. A testwas made after the car had been in service from 5.38a. m. to 9.03 p. m. The first motor on No. 1 circuit, not equipped with the fan but with both handhole plateand commutator cover removed, showed a temperatureof 100 deg. C. on top of the armature. The first motoron No. 2 circuit equipped with a fan with both handholeplate and commutator covers removed, showed a tem-perature of
