. Electric railway journal . ting flues leadingfrom the rheostat compartment through the roof pro-vide natural ventilation, air being taken through open-ings in the floor. The front of the contactors andswitches is accessible from a center aisle into which allcontactors face, thus providing liberal arcing arrangement of rheostat and contactor compart-ment has been found particularly desirable on accountof the ease of inspection and removal of parts that needreplacement. - By this means also all of the high-ten-sion apparatus that might be a source of danger issafely inclosed. Motors
. Electric railway journal . ting flues leadingfrom the rheostat compartment through the roof pro-vide natural ventilation, air being taken through open-ings in the floor. The front of the contactors andswitches is accessible from a center aisle into which allcontactors face, thus providing liberal arcing arrangement of rheostat and contactor compart-ment has been found particularly desirable on accountof the ease of inspection and removal of parts that needreplacement. - By this means also all of the high-ten-sion apparatus that might be a source of danger issafely inclosed. Motors The motors used with these locomotives are thelargest of the axle-mounted type that have been used inthe electrification of steam railways. They are knownas the General Electric type 253. Based on the method of rating, their one-hour rating is452 hp., and the continuous rating, based on a tempera-ture rise of 100 deg. C. in the armature and 120 deg. the fields, is 396 hp. These ratings are for a poten-. C, M. & ST. P. LOCOMOTIVES—DISSEMBLED PARTS FOR FLEXIBLE GEAR tial of 1500 volts, two motors being coupled permanentlyin series for operation on 3000 volts from the line. Themotor is designed for operation with an external blowerand the volume of air at the continuous rating approxi-mates 2500 cu. ft. per minute. The air is blown intothe motor through a large opening on the front of themagnet frame at the commutator end, then passes inparallel streams through the armature and over thefield coils, and is exhausted through openings in themagnet frame and bearing head at the opposite end. Each motor complete, including spring gears, pinions,gear case and axle lining, weighs 14,860 lb. It has fourmain poles and four commutating poles, and is designedfor field control, the field being shunted 50 per cent inmotoring at full speed. The armature has forty-nineslots with seven coils per slot, and the commutator 343segments. The armature has a single-turn winding,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
