An elementary book on electricity and magnetism and their applications . ic motor. enable an electrically driven factory to execute more work thana similar establishment where belt driving is used. Figure182 shows the which a motor may be applied to drivea lathe or drill or other machine, while figure 183 shows alarge traveling crane which is driven by electric motors. Suchcranes are used in nearly all large machine shops. The disposition of electric motors which will give the bestresults in any shop depends upon a great many things, and canbe arrived at only by good judgment. The ideal
An elementary book on electricity and magnetism and their applications . ic motor. enable an electrically driven factory to execute more work thana similar establishment where belt driving is used. Figure182 shows the which a motor may be applied to drivea lathe or drill or other machine, while figure 183 shows alarge traveling crane which is driven by electric motors. Suchcranes are used in nearly all large machine shops. The disposition of electric motors which will give the bestresults in any shop depends upon a great many things, and canbe arrived at only by good judgment. The ideal method wouldbe to have one or more motors built as a part of every machinein the establishment ; but this arrangement would make themachinery too costly and consequently could not be carried DIRECT-CURRENT MOTORS 259 out. The next best arrangement, and the one which is usuallyadopted, is to have all large machines which require consider-able power each furnished with an individual motor. Thesemay be built into the machines, thus doing away with all un- Hoistino Motor. Fig. 183. — Traveling crane with electric motors. necessary belting or gearing; or they may be directly beltedor geared to the usual driving pulleys of the machines. Smallermachinery may be arranged in groups of from two to six ma-chines with a motor to supply power to the machines of eachgroup through a light shaft. Finally there remains the problem of determining the type and sizeof the electric motor required to drive a certain machine or group ofmachines. First it is desirable but often very difficult to get completeinformation about the machines to be driven so as to determine theactual power required. There is a tendency for machine-tool buildersand motor manufacturers to overestimate the horse power required ofa motor in order to be on the safe side. Much useful informationon this subject has been collected in the various engineering hand-books,* but probably the best method is to arrange a temporary tes
Size: 2795px × 894px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
