. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . ^^^^. Fig. C). ArnKitnvf (oil. the bands are loose and then often slip off. When they do so thecoils lly out by centrifugal force, strike the pole pieces and groimdthe motor. Armature Coils. Railway motor armatures are to-day imi-versally constructed with form-wound coils, wiiich are wound ona form of proper shape and carefully insulated before l)eing placedin the armature. The coils of the smaller motors (those \\\
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . ^^^^. Fig. C). ArnKitnvf (oil. the bands are loose and then often slip off. When they do so thecoils lly out by centrifugal force, strike the pole pieces and groimdthe motor. Armature Coils. Railway motor armatures are to-day imi-versally constructed with form-wound coils, wiiich are wound ona form of proper shape and carefully insulated before l)eing placedin the armature. The coils of the smaller motors (those \\\) to 40 or .)() h()rsej)ower)are usuallv wound with round wire. Ihe cotton covering of the wireis de])ended u])on for insulation To strengthen this, however, t!iecoils after being wound are immersed in an insulating compoimdand then baked in an oven. The whole coil is usually wrapped withinsulating tape (See Fig. (>). The armatures of larger motors havecoils made of copper bars. Mica is often placed between and aroundthe bars for insulation, though oiled linen cloth tape cut bias is alsoemployed, especially in repair work. Field Coils. Field coils are so constructed that they
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Keywords: ., bookauthoramericanschoolchicago, bookcentury1900, bookdecade1900
