308 



ELEMENTS OF ELECTRICAL ENGINEERING. 



The magnetizing action of the armature current of a direct- 

 current motor or of a single-phase series motor produces mag- 

 netic flux, as shown in Fig. 263, the inductance of the armature 



winding is due to this flux, and this inductance may be annulled 

 by a neutralizing winding placed in slots in the pole faces, as 

 shown in Fig. 264.* This neutralizing winding is connected, 



Fig. 266. 



as shown in Fig. 265, so that the current flows in one direction 

 in all of the conductors which lie under north poles and in the 

 opposite direction in all of the conductors which lie under south 



*See pages 151 to 158 of the first volume of this text. 



