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In case of a simple lap wound generator, the number of parallel path is equal to the:
1. flux per pole
2. number of poles
3. emf induced
4. speed of the machine

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Correct Answer - Option 2 : number of poles

Armature windings are mainly of two types: lap winding and wave winding

Wave winding:

  • It  the armature winding in which two coils are connected in series and follow each other on the surface of the armature like waves such that there are only two paths for the current flow irrespective of the number of poles in the circuit.
  • For simplex wave winding, number of parallel paths between the brushes is always 2.
  • For multiplex wave winding number of parallel path are ‘2m’

 

Where, m is the multiplicity of the winding

m = 1 for simplex winding

m = 2 for duplex winding

m = 3 for triplex winding

Lap winding:

  • Lap winding is the winding in which successive coils overlap each other. It is named “Lap” winding because it doubles or laps back with its succeeding coils.
  • In this winding, the finishing end of one coil is connected to one commutator segment and the starting end of the next coil situated under the same pole and connected with the same commutator segment.

 

Types of Lap winding:

Simplex lap winding: A winding in which the number of parallel paths between the brushes is equal to the number of poles is called simplex lap winding.

Number of parallel paths (A) = P

Duplex lap winding: A winding in which the number of parallel paths between the brushes is twice the number of poles is called duplex lap winding.

Number of parallel paths (A) = 2P

Triplex lap winding: A winding in which the number of parallel paths between the brushes is thrice the number of poles is called triplex lap winding.

Number of parallel paths (A) = 3P

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