324 



ARMATURE CONSTRUCTION 



up to this length the ends are filed up smooth or ground on a 

 rough emery wheel, and then the bars are taped up, leaving the 

 ends bare for the joints. 



The bars are then inserted in the slots by pushing them in 

 from the end of the armature, each successive group of four pro- 

 jecting further from the slots alternately, as seen in Fig. 398. 



FIG. 399. 



FIG. 400. FIG. 401. 



Formation of V-end Connectors. 



The end connectors are made from copper strip, which is first 

 bent round to the shape of Fig. 399 in any of the strip-bending 

 presses described in Chap. XL, p. 274. 



An alternative is to take a broad sheet of copper and split it 

 nearly to the end, as in Fig. 400. 



FIG. 402. Element of Bar Winding. 



The result of either Fig. 399 or 400 is then spread out to the V 

 shape, and the ends bent up straight as in Fig. 401. The V con- 

 nectors thus formed are taped up except at the ends. (In very 

 low voltage machines the taping might be dispensed with and the 

 connectors simply varnished.) 



The bars are now connected up successively according to the 

 winding diagram. An element of this wave winding so connected 

 is shown diagrammatical ly in Fig. 402. 



