THE DYNAMO. 



Fig. 32. 



conductor, as it were, and the effective resistance of the conductor 

 is increased, so that the RI 2 loss in the conductor is increased. 

 This production of eddy currents in the armature conductors may 

 be greatly reduced by le h 



using stranded conduc- s , j / /. j /* 



V ' .' ' ! 



tors, or by placing the 

 conductors in slots in the 

 armature core. 



33. Examples of typi- 

 cal dynamos. Fig. 3 2 

 shows in outline a typical 

 bipolar dynamo, and 

 Fig. 33 shows a typical 

 multipolar dynamo. The 

 regions ss are called 

 the air gaps, ff the 

 pole faces, pp the pole pieces, and h h k k are called the 

 pole tips or horns ; h h are called the leading pole tips and k k 



are called the trailing pole tips 

 with reference to the motion of 

 the armature as indicated by 

 the curved arrow. The coils 

 of wire ZZ are called the field 

 coils, and the portions C C of 

 the field magnet iron around 

 which the field coils are wound, 

 are called the field magnet 

 cores. The portion Y is 

 called the yoke of the field 

 magnet. 



Fig . 33 . Figs. 32,34, 35, 36 and 37 



show typical forms of bipolar 



field magnet structures, and Figs. 33, 38 and 39 show typical 

 forms of multipolar field magnet structures. The form shown in 



