File:Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others (1911) (14778626643).jpg

Identifier: electrictraction00burc (find matches)
Title: Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others ..
Year: 1911 (1910s)
Authors: Burch, Edward P. (Edward Parris), 1870-1945
Subjects: Railroads
Publisher: New York (etc.) McGraw-Hill Book Company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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r, again, the motor is put in a lathe, the armature is supported onitscenter line, and the motor frame rolled parallel to the shaft. Magnet frames of alternating-current motors consist of an outer steelcasing forming a structural frame for the motor. The frame enclosesa cylindrical field ring or stator built up of thin annular laminations,insulated from each other by j apan or enamel, and securely bolted together. Single-phase and three-phase fields of 50- to 150-h.p. motors are madein one piece, and cannot be divided like those of direct-current motors.Armatures are taken out as in box type frames. Gearless motor fields and frames are split horizontally and are removedin halves, the field windings being disconnected for that purpose. NewYork, New Haven & Hartford motor frames for gearless passenger 196 ELECTRIC TRACTION FOR RAILWAY TRAINS locomotive are split, but the geared and the crank type freight loco-motive motor frames are solid. The frames of the motors for the freight ^^
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locomotive are built up of steel plates and structural angles. The motoris stiff, and light in weight, and the field laminations are well exposed. ELECTRIC RAILWAY MOTORS FOR TRAIN SERVICE 197 Enclosure of the entire motor has finally been effected, at first byprotecting it with canvas or galvanized jron, and then by the use of mostof the magnet frame, in the waterproof motor of 1891. Finally theframe entirely enclosed the motor. The covers over the commutatorsof small motors are closed, while the covers of large motors and also theupper frames often have many half-inch holes. See Ventilation. The axle is enclosed on the Pennsylvania motor cars to keep out dust. Forced draft has been adopted to keep out the dust, to ventilate, andto cool large motors. Examples: 210-h.p., direct-current types for LongIsland Railroad; 275-h.p., direct-current types for Michigan CentralRailroad; 240-h.p. single-phase types, for New York, New Haven &Hartford Railroad; 325-h.p., three-phase types, for

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