. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . embled. A. We will consider each part in theorder mentioned and show how each goto make up the complete armature. It is the present practice to use motorswhich are ventilated so that the maximumpossible work can be gotten out of the coils are made up of turns of copperwire—these wires being placed in thecommutator neck slots T. The coilsare held firmly in place by bauds of steelwire shown by W Fig. 30,—these bandsbeing soldered to retain them in place. The commutator is one of the mostimporta
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . embled. A. We will consider each part in theorder mentioned and show how each goto make up the complete armature. It is the present practice to use motorswhich are ventilated so that the maximumpossible work can be gotten out of the coils are made up of turns of copperwire—these wires being placed in thecommutator neck slots T. The coilsare held firmly in place by bauds of steelwire shown by W Fig. 30,—these bandsbeing soldered to retain them in place. The commutator is one of the mostimportant parts of the armature. Itserves as a means of connection betweenthe winding or armature coils and thesource of the power. All of the currenttaken by the motor passes into the com-mutator and hence into the armaturecoils. The current entering the commu-tator through the brushholders and thecarbon brushes which we will discusslater. The commutator is made up of a num-ber of bars corresponding to the numberof slots and the number of wires perslot. Each bar is of the same shape— fronl Wiper h. Rear Wiper Rifi;^ wilh Double fan fllllJ^Jl + Commuifi!ur FIG. 28. CROSS SECTION SHOWING ARMATURE PARTS MOUNTED ON SHAFT. locomotive. The passage of electric cur-rent through the windings of the armatureresults in heat. The amount of heat dis-sipated, depends on the ventilation of themotor, so that the more air passedthrough, the harder the motor can beworked for the same temperatures. Agreat many of the locomotives have themotors cooled by air furnished from anindependent blower and in order to aidthe passage of air through the motor,same is constructed with a fan on therear end and ventilating ducts through thecore and commutator. This same con-struction is used without external ven-tilation and a large increase in power isobtained due to a larger amount of airwhich can be drawn through the motorthus getting rid of the heat. Fig. 28 shows a cross section of oneof these armatures an
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
