File:Electric locomotive haulage in and about mines (1913) (14755067621).jpg

Identifier: electriclocomoti00newt (find matches)
Title: Electric locomotive haulage in and about mines
Year: 1913 (1910s)
Authors: Newton, Leonard Victor
Subjects: Electric locomotives Mine railroad cars Electric railroads Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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w. Power for operating the cable reel was furnished by chain c and sprq£;et drive from the locomotive axle. A number of locomotivesare still in operation with^form of drive, but because of the factthat clutches, shifting levers, or friction discs are necessarythis type has been largely discontinued. In 1907 the General Electric Co. brought out a motordriven reel. This reel was driven through double reduction gearingby a small vertical series wound motor. The reel proper is support-ed by the motor frame and rotates on a hall bearing between themain 7ear and the top of the motor. The motor is connected direct-ly across the line in series with a permanent resistance whichprotects it from being burnt out by a heavy rush of current whenthe locomotive is standing still. The motor is so designed thatit may be operated continuously without overheating. Most of thereels are equipped with 500 feet of flexible heavy insulated cable.The inner end of this cable is connected to a collector ring on
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PLATE 27. CABLE REEL MOTOR WITH REEL REMOVED PLATE 28. 19 the under side of the reel and the outer end is fitted with a cop-per hook for attaching to the main entry trolley wire. On leavingthe entry the cable is hooked over the trolley wire, and as thelocomotive moves up towards the room, the reel motor virtually be-comes a series generator, its counter electromotive force produc-ing a torque sufficiently great to produce a tension in the cablewhich causes it to pay out evenly and to drop on the road withoutkinks, this being very conducive to longevity of the cable. Themotor and gearing are so designed that the motor has a tendencyto produce a peripheral speed at the rim of the wheel that is high-er than the linear speed of the locomotive, so that there is aconstant tension in the cable, which insures it being wound com-pactly. Plate 27 illustrates three gathering locomotives built bythe General Glectric Co., the center plate and Plate 28 showing themanner in which the reel and motor

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