. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re* Tn»T»i*«t-».«« a-nA FIG. 4- UNDISTORTEU FIELD MAG-NETISM. ism, and the dotted arrow, opposing it,that of the armature. This behavior ofthe armature is called the demagnetizingaction of the armature and the turns thatlie in the double angle A, the back arma-ture turns or simply back other part of the armature contain- October, 1909. RAILWAY AND LOCOMOTIVE ENGINEERING 449 iiig the conductors that lie outside theangle of 2A is shown in Fig. 3. Here theconductors under the north and
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re* Tn»T»i*«t-».«« a-nA FIG. 4- UNDISTORTEU FIELD MAG-NETISM. ism, and the dotted arrow, opposing it,that of the armature. This behavior ofthe armature is called the demagnetizingaction of the armature and the turns thatlie in the double angle A, the back arma-ture turns or simply back other part of the armature contain- October, 1909. RAILWAY AND LOCOMOTIVE ENGINEERING 449 iiig the conductors that lie outside theangle of 2A is shown in Fig. 3. Here theconductors under the north and southpoles of the motor are evenly matched,and each set is carrying a current in op-posite directions. The result, as before,i,^ a magnet whose magnetism, however,•does not oppose that of the fields, but isat right angles to it, as indicated by the. CoTfifn V to**-*! Plo-M* FIG. s. FIELD MAGNETISM DISTORTEDBY ARMATURE REACTION. dotted arrow. This action of the arma-ture is known as the cross magnetizingaction, and the turns that produce it arecalled the cross armature turns. Thus itis evident that the armature of the shopmotor really acts as two magnets whichare entirely independent of the field mag-nets, and this behavior is known as thearmature reaction. Next we must consider what the com-bined action of the field magnets and theback and cross magnetism of the arma-ture have upon each other. If the arma-ture had no magnetism, then the path ofthe field magnetism through the armaturewould be a series of straight lines, asshown in Fig. 4. But the armature doespossess magnetism of its own, and whenwe combine the three magnetic fieldsthere results a shifting or skewing of themagnetism, and the lines are crowded toone side of each pole, as shown in Fig. back turns are easily overcome, be-cause the field magnets are much morepow
Size: 2129px × 1173px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
