# Compare Lap Winding and Wave Winding

In this post, comparison between lap winding and wave winding is given on the basis of parallel path, current in each path, equalizer rings, commutation difficulty and on the basis of conductors.

## Lap winding – Wave winding

• The number of parallel paths in the lap winding is equal to number of poles whereas the number of parallel paths in the wave winding is equal to two.
• The number of conductors in the simplex lap winding is p / 2 times to that of simplex wave winding but the cross section of each conductor in a lap winding is 2 / p times to that of each conductor in wave winding.
• The current in each parallel path of the lap winding is 1 / p times the rated armature current whereas the current in each parallel path of the armature winding is 1 / 2 times the rated armature current.
• The lap winding is identified by large number of conductors with smaller cross section area whereas the wave winding is identified by small number of conductors with large cross section area.
• The wave winding has smaller coils which reduces the cost of manufacture and repair.
• The equalize connection is necessary in the lap winding whereas it is not requiring in the wave winding.
• The equalizing rings provide extra cost in the lap winding.
• There is a commutation difficulty beyond 200 amp therefore the wave winding is used for current rating up to 400 amp whereas the lap winding employs beyond 440 amp. It does not mean that the lap winding is not used less than 440 amp.
• The lap winding can short pitch which reduces its weight.
• Each coil in the lap winding closes at the commutator end therefore the coils are easy to form than the wave winding.

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