308 



ARMATURE CONSTRUCTION 



In winding by this method, care should be taken that the end 

 of the wire which pushes the pins out of the slot is well rounded 

 with a file, since, if left rough, it will damage the insulation of the 

 wires already in the slot. 



In the case we have considered, the ranges are both bent back 

 as in Fig. 230, d. If the second range is to project straight out, as 

 is actually the case in the stator shown in Fig. 361, the coils may 

 be wound over a block shaped in the manner indicated by Fig. 370, 

 from which the method of winding will be apparent. Fig. 371 

 shows a coil in process of winding over a block of this form. 



FIG. 371. Hand Winding of Alternator Coils (Alioth Co.). 



The straight coils may often be wound without the aid of a 

 block, by shaping them simply by hand. This is easier if there 

 are few conductors per slot, and the conductor is a fairly big wire 

 which will remain in the shape to which it is bent by hand. 



Fig. 372 illustrates the winding of a 3-phase, whole-coiled, 

 double-coil winding in three ranges. The photo shows two ranges 

 completed, and the first coil of the third range in process of winding. 

 The winding is a whole-coiled winding with 6 coils per phase, and 

 hence 6-pole, and 18 coils in all. 



Table XIV. on p. 203 shows that the number of slots per pole per 

 phase must be 4, and hence the total number of slots is 4 x 3 x 6 = 



