PARTS OF A DYNAMO-ELECTRIC MACHINE 



83 



Commercial Windings. None of the windings given so 

 far represent actual practice. In a slotted armature there 

 are always at least two inductors per slot and these induct- 

 ors are not parts of the same coil; they form sides of two 



Back connections dotted lines 

 Front connections full lines 



FIG. 44. Simple Wave Winding for Four-pole Machine. 



different coils and the winding may be said to be a two 

 coil sides per slot winding or a one coil per slot winding. This 

 is the usual form of winding, using as many coils as there 

 an- slots and therefore as many commutator bars as there 

 arc slots. In each slot there are two coil sides. 



