Basically there are two physical types of the windings. These are i) Single layer winding ii) Double layer winding. The sequential arrangement of coils around the armature is different for both these types of windings.
|Fig. 1 Single layer winding|
|Fig. 2 Double layer winding|
Advantages of Double Layer Winding
The double layer winding has following advantages,
1) It provides neat arrangement as all coils are identical.
2) Greater flexibility can be achieved with double layer winding as coil span can be easily selected.