Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . 356 ELECTRIC RAILWAYS 259 supported truck frame. The truck frame has a vertical movementwith respect to the armature. The pole pieces are prevented frombinding on the armature by the use of a large air gap andrather flat pole shoes. The magnetic circuit of this equip-ment is from end to e
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . 356 ELECTRIC RAILWAYS 259 supported truck frame. The truck frame has a vertical movementwith respect to the armature. The pole pieces are prevented frombinding on the armature by the use of a large air gap andrather flat pole shoes. The magnetic circuit of this equip-ment is from end to end of the four motors, returning throughthe steel frame. Figures 247 and 248 show details of the motor motor is known as the General Electric 84, and has a ratingof 550 The operating voltage is 600 and at rated load thelocomotive draws 3,050 amperes. When drawing this current itproduces 20,500 pounds tractive effort and makes a speed of 40miles per Fig. 247. Section of Motor Used on Locomotive Shown in Fig. 246 The control equipment is of the multiple-unit type, similar ingeneral principle to the one described earlier. On account of the sizeof the motors it has been found practicable to have three runningpositions, namely, with the motors (a) in series, (b) in series-parallel,and (c) in parallel. The conta,ctors for making these connectionsare located in the spaces beyond the ends of the cab. The use ofthe multiple-unit system permits the operation of two or morelocomotives as a single unit if extra power is desired to move a heavytrain. The control equipment contains a device to provide againstexcessive draft of current. A friction clutch, operated by a solenoid 357 260 ELECTRIC RAILWAYS ro <^ which carries the current of one of the motors, prevents themovement of the operating lever of the controller when thecurrent is excessive. This will be recognized as similar to thedevice described earlier in the course as one used in
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
