Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 133. Motor Field Coils Prop-erly Wound Fig. 134. Magnetic Field of Motorwhen One Field Coil is Reversed In Fig. L33 all of the fields are connected correctly. The flowof magnetism is into one pole and out of the adjacent one. Some ofthe magnetism leaks out of the shell and affects a
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . Fig. 133. Motor Field Coils Prop-erly Wound Fig. 134. Magnetic Field of Motorwhen One Field Coil is Reversed In Fig. L33 all of the fields are connected correctly. The flowof magnetism is into one pole and out of the adjacent one. Some ofthe magnetism leaks out of the shell and affects a compass held nearthe outside. The direction taken by the compass needle in the dif-ferent positions is shown. The needle should point in oppositedirections over adjacent coils and should lie parallel to the shell inpositions half way between two coils. Figure 134 shows the flow of magnetism when one field is re-versed. In such a case the compass will take the position field marked X is the one reversed. 245 150 ELECTRIC RAILWAYS With one reversed field a machine will usually operate, as themagnetism in three of the poles is in the normal direction. But anexcessive flow of current that has no effect in turning the armaturewill take place on that side of the armature next to the reversed field
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