. Electric railway review . colonies with 750, Germany 700, France 400, Austria 200,Deshlar. O., and has completed much of the grading for an Italy 180, Hungary 130, and Switzerland with 120. December 28, 1907. ELECTRIC RAILWAY REVIEW 989 THE INTERPOLE RAILWAY MOTOR—A GRAPHIC EX-PLANATION. BY NORMAN (i. MEADE. To clearly comprehend the theory and performance of theinterpole railway motor, a brief review of the action aadgeneral principles of an ordinary direct current motor will behelpful. It is necessary to consider carefully the variousforces that effect the behavior under different conditio
. Electric railway review . colonies with 750, Germany 700, France 400, Austria 200,Deshlar. O., and has completed much of the grading for an Italy 180, Hungary 130, and Switzerland with 120. December 28, 1907. ELECTRIC RAILWAY REVIEW 989 THE INTERPOLE RAILWAY MOTOR—A GRAPHIC EX-PLANATION. BY NORMAN (i. MEADE. To clearly comprehend the theory and performance of theinterpole railway motor, a brief review of the action aadgeneral principles of an ordinary direct current motor will behelpful. It is necessary to consider carefully the variousforces that effect the behavior under different conditions ofoperation. First consider the force acting on a conductor which iscarrying a current across a magnetic field. Let the arrows. >v 1 n 5 * ? ■ i 1 ^ interpole Motors—Figure 1. Figure 1, represent magnetic lines of force flowing betweenthe pole faces of the magnet N S and let the small circlerepresent the cross section of a conductor perpendicular to theplane of the lines. So long as no current flows through the. Interpole Motors—Figure 2. conductor the magnetic field is not disturbed. Assume that acurrent is passed through the conductor so that it flows awayfrom the observer; then a magnetic flux will be set up aboutit as shown by the circles in Figure 2. This flux tends to Af Interpole Motors—Figure 3. oppose the original lines below the conductor and make themmore dense above the conductor as shown in Figure ?, andthe wire is forced downward. This action is essentially the same as takes place in anelectric motor. The armature conductors are forced acrossthe field by the reaction of the armature current, performingmechanical work. In the ordinary direct current motor the brushes have tobe given a backward lead to obtain a field for si)arkless com-mutation. This .sets up two coniiionents in the armature, theback ampere-turns and the cross ampere-turns. The backampere-turns, included in the angle, b. Figure -1, directlyoppose the field flux, and the cross ampere-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
