. The Street railway journal . MOTORS Are distinguished by unusually liberal ventilation and low temperature in operation FRAME THE frame isdivided hori-zontally intohalves. The lowerhalf can readily beswung down to theposition shown inthe illustration, or,if desired, it may beentirely removed, POLEPIECES The pole piecesare made up ofsoft laminated steelpunchings rivetedtogether. Eachpole piece has aAire at the arma-ture end, which,besides holding thefield coil in place,effects the best dis-tribution of thelines of magneticflux. Ventilatingducts through thebody of the polepiece permit aircircu
. The Street railway journal . MOTORS Are distinguished by unusually liberal ventilation and low temperature in operation FRAME THE frame isdivided hori-zontally intohalves. The lowerhalf can readily beswung down to theposition shown inthe illustration, or,if desired, it may beentirely removed, POLEPIECES The pole piecesare made up ofsoft laminated steelpunchings rivetedtogether. Eachpole piece has aAire at the arma-ture end, which,besides holding thefield coil in place,effects the best dis-tribution of thelines of magneticflux. Ventilatingducts through thebody of the polepiece permit aircirculation andinsure a low tem-perature of thefield BEARINGS The bearings are Babbitt lined castiron shells of ample dimensions, with means for abundant and constant lubrica-tion. Both armature and axle bearing caps are bolted to the top half of the motor frame. FIELD COILS The field coils are wound of square wire, eliminating the air spaces which occur when round wire is used, and thussecuring a rapid transfer of heat from the interior to the surface of the coil. The coils are insulated with successive laversof insulating material with an insulating compound, the layers being thoroughly cemented together into a solid mass. Thisinsulation is water proof and elastic, strong both electrically and mechanically, and because of its solidity, permits of therapid transfer of heat from the coil. ARMATURE The armature is unusually well ventilated. Large ducts parallel to the shaft allow the air to enter the body ofthe armature and ventilating ducts, perpendicular to the shaft, allow the heat to escape. The end castings project abovethe level of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
