43 8 



ELEMENTS OF ELECTRICAL ENGINEERING. 



Fig. 57 shows a six pole drum simplex wave winding with 62 

 inductors, having a back pitch of -f 9, a front pitch of -f n, 

 an average pitch of 10, and a commutator pitch of -f 10. This 



Six-pole drum simplex wave winding. Z=6z, front pitch = -f- II, back pitch 

 _|_ 9, average pitch IO, commutator pitch -f- 10, number of paths = 2. 



Fig. 57. 



winding presents two paths in parallel between the brushes with 

 one half of the inductors in series in each path, and it needs only 



