File:The Street railway journal (1904) (14575361709).jpg

Identifier: streetrailwayjo241904newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ionis so good that a current of 1000 amps, at 650 volts does not inany way indicate its presence at the brushes, and the motorsseem to be perfect in this respect. A further reason of thegood commutation, necessitated by the design of the motorswith its large air gap, is the very stable field, which bears agreater ratio to armature strength than is customary in stand-ard railway motors. Good commutation appears to be a func-tion of ratio of field to armature ampere turns and slot in-ductance, and that both of these factors have been very welltaken care of in the design of the New York Central locomo-tive is evidenced by its sparkless running. The brush holders are mounted on insulated supports at-tached to the spring saddle over the axle journal, thus main-taining a fixed positon of the brush holder in relation to thecommutator. These brush holders are made adjustable so asto allow for wear of the commutator and journal bearings. The motor is protected from mechanical injury from below
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OVERHEAD CONDUCTOR AT CROSSING, NEW YORK CENTRALTEST TRACK by brass screens which extend from pole piece to pole piece,but which are not carried up at the side of the motor. Thisprovides most effective ventilation, and at the same time allthe mechanical protection which it is thought is required. Bothfields and armature are thoroughly insulated, and this fact, withthe large commutator and the consequent small difference of November 19, 1904.) STREET RAILWAY JOURNAL. 903 volts per bar, amply provides against trouble from dust andmoisture. Proper distribution and division of the weight of thelocomotive among the axles has been accomplished by sus-pending the main frame and superstructure from a systemof half elliptic springs and equal-ized levers of forged steel, thewhole being so arranged as tocross-equalize the load and tofurnish three points of support. The pony trucks are of theradial type and are pivoted bymeans of radius bars to the endframe of the main truck. Theframe of the loco

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