THE ALTERNATOR 101 



winding type, shown in Figs. 101 (a), 104, 108, 112, and 114, or of 

 the wave-winding type, shown in Fig. 101 (6). In the direct - 

 current machine the wave winding gives a higher voltage than the 

 lap winding, if the number of series-connected conductors and 

 other conditions arc the same. In the alternator, the wave and 

 lap windings give the *</ we voltage, if the number of series-con- 

 nected conductors and other conditions are the same. An 

 inspection of Fig. 101 (a) and (6) shows that each winding has the 

 same number of series conductors between terminals. 



(6) Single-phase 

 partially distributed wave windiug 



I'M;. 101. Single-phase lap and wave windings. 



The type of winding shown in Figs. 101, 104, 111, etc., is called 



the barrel winding. The type shown in Fig. 105 (a) is called the 



winding. A development of the spiral into the chain 



winding is shown in Figs. 107 and 110. 



62. Single-phase Windings. -Figure 102 shows a single-phase, 

 siiiiilf-layr. half-coil winding for a four-pole machine. 'Phis 

 machine has four slots and four poles, making one slot per pole. 



Tin- winding is called a half-coil winding, because there is but 

 one-half coil or coil-group per pole. The- two coils are shown c<m- 



Bf, and T\ and 7'... arc the terminal- of the winding. 

 Figure UK* shows the same type of winding as Fig. K 1 

 that four coil- are now used. Therefore, there are two coil 

 lot. Thi- ; - called a single-pha>e. two-layer. //'// 



winding. It is called a whole-coij winding because there is one 



