According to the way of connecting the conductors, armature winding has basically two types namely,
(i). Lap winding and (ii). Wave winding
- Lap winding : In this case, if connection is started from conductor in slot 1 then connections overlap each other as winding proceeds, till starting point is reached again.
Developed view of part of the armature winding in lap fashion is shown in the figure.
Due to such connection, the total number of conductors get divided into ‘P’ number of parallel paths, where P = Number of poles in the machine.
Large number of parallel paths indicate high current capacity of machine hence lap winding is preferred for high current rating generators.
- Wave Winding : In this type of connection, winding always travels ahead avoiding overlapping. It travels like a progressive wave hence called wave winding. To get an idea of wave winding a part of armature winding in wave fashion is shown in the figure.
Both coils starting from slot 1 and slot 2 are progressing in wave fashion.
Due to this type of connection, the total number of conductors get divided into two number of parallel paths always, irrespective of number of poles of the machine. As number of parallel paths are less, it is preferable for low current, high voltage capacity generators.
The number of parallel paths in which armature conductors are divided due to lap or wave fashion of connection is denotes as A. So A = P for lap connection and A = 2 for wave connection.